Inner container sealing gland
By designing an H-shaped structural rib and an arc-shaped transition connection for the inner liner sealing cap, the problem of insufficient density in the traditional sealing cap during the casting process was solved. This enabled sequential solidification of the casting and improved structural rigidity, reduced the risk of hot water and steam leakage, and optimized the bolt tightening process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-29
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional sealing glands are difficult to solidify sequentially during the casting process, resulting in poor feeding channels, which affects the tightness and makes them prone to shrinkage cavities and porosity. They also pose a risk of hot water and steam leakage during service.
An inner liner sealing cap was designed, which adopts an H-shaped structural process rib and an arc transition connection to widen the feeding channel. Folded edges and weight reduction grooves are set on the flange to ensure sequential solidification and improve structural rigidity. At the same time, the bolt tightening sequence is indicated by the cast lettering on the bolt holes.
It significantly reduces the risk of shrinkage cavities and porosity in castings, improves the flatness and structural rigidity of the sealing gland, reduces the risk of hot water and steam leakage, lowers manufacturing costs, and ensures the accuracy of bolt tightening.
Smart Images
Figure CN224094630U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a water heater sealing technical field, specifically, relate to a liner sealing gland. BACKGROUND
[0002] The sealing gland is an important component of the water heater, and its function is to install and fix the heat exchange element of the water heater on the flange of the water heater liner.
[0003] The traditional sealing gland is made of stainless steel investment casting, and the sealing gland flange is provided with two sprues, which are symmetrically arranged on two intersection points of the extension line of the circular tube interface structure reinforcing rib and the pitch circle diameter (PCD) of the flange bolt hole. Limited by structure and size, the sealing gland is difficult to realize sequential solidification and establish effective feeding channels during the stainless steel casting and solidification process, and is prone to shrinkage porosity, which affects the compactness of the sealing gland. The overall thickness of the sealing gland is relatively thin, and warping deformation often occurs during the solidification process and the heat treatment process of the casting. The unevenness or warping deformation of the sealing gland flange increases the risk of leakage of hot water and steam during service. The sealing gland is connected with the flange on the liner by bolts. The sequence of tightening the bolts is crucial to ensure the sealing and reliability of the connection, and the error of the worker's tightening operation sequence may cause risks to the sealing and reliability of the sealing gland.
[0004] Therefore, there is an urgent need for a technology to replace the existing liner sealing gland to solve the problem of how the traditional sealing gland produces shrinkage porosity due to the difficulty in sequential solidification and poor feeding channels during the casting process, resulting in the compactness being affected. INVENTION CONTENTS
[0005] In view of this, the utility model provides a liner sealing gland, which aims to solve the problem of how the traditional sealing gland produces shrinkage porosity due to the difficulty in sequential solidification and poor feeding channels during the casting process, resulting in the compactness being affected.
[0006] The utility model provides a liner sealing gland, which is a whole disc structure, comprising: a flange and a bottom disc, the flange and the bottom disc are connected by an arc transition, and the transition arc corresponds to the arc of the liner connection flange.
[0007] A first circular tube interface and a second circular tube interface are formed on the upper surface of the bottom disc, the first circular tube interface and the second circular tube interface have the same diameter, the first circular tube interface and the second circular tube interface are connected with the flange through a first channel and a second channel respectively, and an H-shaped structure process rib is arranged on the upper surface of the bottom disc.
[0008] Further, the H-shaped process rib is provided with a first side rib and a second side rib, the first side rib and the second side rib are distributed in axis symmetry with the center connecting line of the first circular pipe interface and the second circular pipe interface, the length of the first side rib and the second side rib is the same as the center distance of the first circular pipe interface and the second circular pipe interface, the height of the first side rib and the second side rib is the same as the first circular pipe interface and the second circular pipe interface, the two ends of the first side rib and the second side rib are connected with the connecting rib of the first circular pipe interface and the second circular pipe interface through a circular arc transition, the H-shaped process rib is provided with a middle rib, the middle rib is connected with the midpoint of the first side rib and the second side rib, and the thickness and height of the middle rib are the same as those of the first side rib and the second side rib.
[0009] Further, the flange is provided with a first bolt hole, a second bolt hole, a third bolt hole, a fourth bolt hole, a fifth bolt hole and a sixth bolt hole, the first bolt hole, the second bolt hole, the third bolt hole, the fourth bolt hole, the fifth bolt hole and the sixth bolt hole are respectively distributed in symmetry about the geometric center of the sealing gland, the outer edge of the flange is provided with a folded edge downwardly and obliquely, the height of the folded edge is the same as the thickness of the flange, and the angle between the folded edge and the flange plane is 60°.
[0010] Further, the first circular pipe interface and the second circular pipe interface are symmetrically distributed with the center connecting line of the first bolt hole and the second bolt hole as the axis of symmetry, and the top surface of the first circular pipe interface and the second circular pipe interface is flush with the top surface of the flange.
[0011] Further, the width of the first channel and the second channel is equal to the inner diameter of the first circular pipe interface and the second circular pipe interface, and the height of the first channel and the second channel is the same as that of the first circular pipe interface and the second circular pipe interface.
[0012] Further, the first weight-reducing long groove, the third weight-reducing long groove, the second weight-reducing long groove and the fourth weight-reducing long groove are provided between the first bolt hole and the third bolt hole, between the first bolt hole and the fifth bolt hole, between the second bolt hole and the fourth bolt hole, and between the second bolt hole and the sixth bolt hole, and the depth of the first weight-reducing long groove, the third weight-reducing long groove, the second weight-reducing long groove and the fourth weight-reducing long groove is 1mm.
[0013] The first weight-reducing long groove and the fourth weight-reducing long groove are respectively symmetrically distributed with the third weight-reducing long groove and the second weight-reducing long groove through the center connecting line of the first bolt hole and the second bolt hole as the axis of symmetry, and the first weight-reducing long groove and the third weight-reducing long groove are respectively symmetrically distributed with the fourth weight-reducing long groove and the second weight-reducing long groove through the center connecting line of the first circular pipe interface and the second circular pipe interface as the axis of symmetry.
[0014] Further, a first weight-reducing short groove and a third weight-reducing short groove are arranged between the third bolt hole and the sixth bolt hole, and a second weight-reducing short groove and a fourth weight-reducing short groove are arranged between the fourth bolt hole and the fifth bolt hole, the first weight-reducing short groove, the third weight-reducing short groove, the second weight-reducing short groove and the fourth weight-reducing short groove have a depth of 1mm;
[0015] The first weight-reducing short groove and the third weight-reducing short groove are symmetrically distributed with the fourth weight-reducing short groove and the second weight-reducing short groove as the symmetry axis of the center connecting line of the first bolt hole and the second bolt hole, and the first weight-reducing short groove and the fourth weight-reducing short groove are symmetrically distributed with the third weight-reducing short groove and the second weight-reducing short groove as the axis of the center connecting line of the first circular pipe interface and the second circular pipe interface, the interval distance of the first weight-reducing short groove and the third weight-reducing short groove is the same as the interval distance of the fourth weight-reducing short groove and the second weight-reducing short groove, and is not less than the width of the first channel and the second channel.
[0016] Further, the first weight-reducing long groove, the second weight-reducing long groove, the third weight-reducing long groove and the fourth weight-reducing long groove are provided with cast characters 1, 2, 5 and 6 near the first bolt hole, the second bolt hole, the fifth bolt hole and the sixth bolt hole, respectively.
[0017] The first weight-reducing short groove and the second weight-reducing short groove are provided with cast characters 3 and 4 near the third bolt hole and the fourth bolt hole, respectively.
[0018] Further, the sealing gland is made of stainless steel by investment casting, and the inner sides of the first circular pipe interface and the second circular pipe interface are provided with threads for connecting the heat exchange elements inserted into the inner container.
[0019] Compared with the prior art, the utility model has the advantages that:
[0020] 1. The first channel and the second channel arranged between the first circular pipe interface and the second circular pipe interface of the sealing gland and the flange greatly widen the feeding channel of the casting, realize the sequential solidification of the casting under the cooperation of the H-shaped structure process rib, improve the feeding capacity of the casting in the solidification process, and significantly reduce the risk of shrinkage cavity and shrinkage porosity of the casting.
[0021] 2. The H-shaped structure process rib and the folding edge of the outer edge of the flange jointly act on the structural rigidity of the sealing gland, reduce the deformation of the sealing gland in the solidification and heat treatment process, improve the flatness of the part, and reduce the risk of hot water and steam leakage caused by warping or unevenness.
[0022] 3. The weight-reducing grooves on the flange are beneficial to reducing the weight of the part and reducing the manufacturing cost. The interval area between the weight-reducing short grooves reserves space for the pouring gate and facilitates the polishing and cleaning of the pouring gate.
[0023] 4. The number in the weight-reducing groove is the sequence number of bolt tightening, which prevents the sealing property and reliability risk caused by the incorrect sequence of worker tightening operation. BRIEF DESCRIPTION OF DRAWINGS
[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals in different drawings represent the same or similar elements. In the drawings:
[0025] Fig. 1 Front view structural diagram of the sealing gland provided by the embodiment of the present application;
[0026] Fig. 2 Back view structural diagram of the sealing gland provided by the embodiment of the present application;
[0027] Fig. 3 Sectional view of the sealing gland provided by the embodiment of the present application.
[0028] In the drawings: 1-flange; 2-bottom disc; 3-first circular pipe interface; 4-second circular pipe interface; 5-first side rib; 6-second side rib; 7-middle rib; 8-flange; H1-first bolt hole; H2-second bolt hole; H3-third bolt hole; H4-fourth bolt hole; H5-fifth bolt hole; H6-sixth bolt hole; S1-first weight-reducing long groove; S2-second weight-reducing long groove; S5-third weight-reducing long groove; S6-fourth weight-reducing long groove; S3-first weight-reducing short groove; S4-second weight-reducing short groove; S7-third weight-reducing short groove; S8-fourth weight-reducing short groove; G1-first channel; G2-second channel. DETAILED DESCRIPTION
[0029] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.
[0030] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0031] The terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply relative importance or a number of the indicated technical features. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified and limited.
[0032] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0033] Referring to Figs. 1-3 As shown in the drawings, the embodiment provides a liner sealing gland, which is a whole disc structure, comprising: a flange 1 and a bottom disc 2, the flange 1 and the bottom disc 2 are connected by arc transition, and the transition arc corresponds to the arc of the liner flange 1.
[0034] A first circular pipe interface 3 and a second circular pipe interface 4 are arranged on the upper surface of the bottom disc 2, the first circular pipe interface 3 and the second circular pipe interface 4 have the same diameter, the first circular pipe interface 3 and the second circular pipe interface 4 are connected with the flange 1 through a first channel G1 and a second channel G2 respectively, and the upper surface of the bottom disc 2 is provided with an H-shaped structure process rib.
[0035] It can be understood that the flange 1 and the bottom disc 2 are connected by arc transition, and the transition arc corresponds to the arc of the liner connecting flange 1, which makes the component better fit when assembled with the liner connecting flange, reduces the risk of sealing or leakage due to shape mismatch, and improves the stability and reliability of the overall structure.
[0036] Specifically, the H-shaped structure process rib is provided with a first side rib 5 and a second side rib 6, the first side rib 5 and the second side rib 6 are distributed symmetrically about the center connecting line of the first circular pipe interface 3 and the second circular pipe interface 4, the length of the first side rib 5 and the second side rib 6 is the same as the center distance of the first circular pipe interface 3 and the second circular pipe interface, the height of the first side rib 5 and the second side rib 6 is the same as that of the first circular pipe interface 3 and the second circular pipe interface 4, the two ends of the first side rib 5 and the second side rib 6 are connected with the first circular pipe interface 3 and the second circular pipe interface 4 through the arc transition connecting rib respectively, the H-shaped structure process rib is provided with a middle rib 7, the middle rib 7 is connected with the midpoint of the first side rib 5 and the second side rib 6, and the thickness and height of the middle rib 7 are the same as those of the first side rib 5 and the second side rib 6.
[0037] It can be understood that the first side rib 5 and the second side rib 6 are symmetrically distributed about the first and second circular pipe interface center connecting line axis, and when the part is subjected to external force from various directions (such as internal pressure, external mechanical impact, etc.), the symmetric structure can uniformly disperse the stress to the two side ribs, avoid local stress concentration, thereby effectively improve the structural strength of the entire base plate 2 and the flange 1 connected thereto, prevent deformation, rupture and other damage. The middle rib 7 is connected to the midpoint of the first side rib 5 and the second side rib 6, and a stable mechanical frame is constructed. Like the steel beam structure in the building, the parts work together to greatly enhance the overall rigidity of the H-shaped structure process rib. In a complex working environment, for example, under high temperature and high pressure working conditions, it can ensure that the base plate 2 maintains a stable shape and size, maintains the normal operation of the entire equipment, and reduces the failure rate caused by unstable structure.
[0038] Specifically, the flange 1 is provided with a first bolt hole H1, a second bolt hole H2, a third bolt hole H3, a fourth bolt hole H4, a fifth bolt hole H5 and a sixth bolt hole H6, and the first bolt hole H1, the second bolt hole H2, the third bolt hole H3, the fourth bolt hole H4, the fifth bolt hole H5 and the sixth bolt hole H6 are symmetrically distributed about the geometric center of the sealing gland, and the outer edge of the flange 1 is provided with a folded edge 8 downwardly and obliquely, the height of the folded edge 8 is the same as the thickness of the flange 1, and the angle between the folded edge 8 and the plane of the flange 1 is 60°.
[0039] It can be understood that the folded edge 8 and the plane of the flange 1 form an angle of 60° and the height is the same as the thickness of the flange 1, and this design makes the folded edge 8 play a certain supporting and strengthening role when the flange 1 is subjected to external force (such as pressure, vibration, etc.), disperses stress, and reduces the possibility of flange 1 deformation. Improve the structural strength and rigidity of the flange 1 during operation, prolong its service life.
[0040] Specifically, the first circular pipe interface 3 and the second circular pipe interface 4 are symmetrically distributed with the center connecting line of the first bolt hole H1 and the second bolt hole H2 as the axis of symmetry, and the top surface of the first circular pipe interface 3 and the second circular pipe interface 4 is flush with the top surface of the flange 1.
[0041] It can be understood that the top surface of the first circular pipe interface 3 and the second circular pipe interface 4 is flush with the top surface of the flange 1, so that the sealing surface is more flat and regular during the sealing operation. The flat sealing surface helps the sealing gasket to be uniformly pressed, thereby forming a more reliable sealing effect, effectively preventing leakage of the medium from the interface, and ensuring the safety and stability of the medium transmission during the operation of the equipment.
[0042] Specifically, the width of the first channel G1 and the second channel G2 is equal to the inner diameter of the first circular pipe interface 3 and the second circular pipe interface 4, and the height of the first channel G1 and the second channel G2 is the same as that of the first circular pipe interface 3 and the second circular pipe interface 4.
[0043] It can be understood that the width and height of the first channel G1 and the second channel G2 are equal to the inner diameter of the first circular pipe interface 3 and the second circular pipe interface 4. Such a size design, combined with the cooperation of the H-shaped structure process rib, widens and optimizes the feeding channel of the casting. During the casting process, the liquid metal can flow more smoothly, better realize the sequential solidification of the casting, improve the feeding capacity of the casting during the solidification process, significantly reduce the possibility of casting defects such as shrinkage holes and shrinkage porosity, and ensure the quality and internal organization density of the casting.
[0044] Specifically, first weight-reducing long grooves S1 and third weight-reducing long grooves S5 are arranged between the first bolt hole H1 and the third bolt hole H3, and between the first bolt hole H1 and the fifth bolt hole H5, and second weight-reducing long grooves S2 and fourth weight-reducing long grooves S6 are arranged between the second bolt hole H2 and the fourth bolt hole H4, and between the second bolt hole H2 and the sixth bolt hole H6, the depth of the first weight-reducing long grooves S1, the third weight-reducing long grooves S5, the second weight-reducing long grooves S2 and the fourth weight-reducing long grooves S6 is 1mm;
[0045] The first weight-reducing long grooves S1 and the fourth weight-reducing long grooves S6 are symmetrically distributed about the center connecting line of the first bolt hole H1 and the second bolt hole H2 as the symmetry axis, and the first weight-reducing long grooves S1 and the third weight-reducing long grooves S5 are symmetrically distributed about the center connecting line of the first circular pipe interface 3 and the second circular pipe interface 4 as the axis of symmetry.
[0046] Specifically, first weight-reducing short grooves S3 and third weight-reducing short grooves S7 are arranged between the third bolt hole H3 and the sixth bolt hole H6, and second weight-reducing short grooves S4 and fourth weight-reducing short grooves S8 are arranged between the fourth bolt hole H4 and the fifth bolt hole H5, the depth of the first weight-reducing short grooves S3, the third weight-reducing short grooves S7, the second weight-reducing short grooves S4 and the fourth weight-reducing short grooves S8 is 1mm;
[0047] The first weight-reducing short grooves S3 and the third weight-reducing short grooves S7 are symmetrically distributed about the center connecting line of the first bolt hole H1 and the second bolt hole H2 as the symmetry axis, and the first weight-reducing short grooves S3 and the fourth weight-reducing short grooves S8 are symmetrically distributed about the center connecting line of the first circular pipe interface 3 and the second circular pipe interface 4 as the axis of symmetry, the interval distance of the first weight-reducing short grooves S3 and the third weight-reducing short grooves S7 is the same as the interval distance of the fourth weight-reducing short grooves S8 and the second weight-reducing short grooves S4, and is not less than the width of the first channel G1 and the second channel G2.
[0048] It can be understood that the weight-reducing groove directly reduces the material usage of the flange 1, thereby reducing the weight of the entire sealing gland component. This is helpful for reducing energy consumption, facilitating transportation and installation, and reducing the pressure on the supporting structure in some equipment with weight requirements, such as equipment that needs to be moved or installed in a specific load-bearing limited environment.
[0049] Specifically, in the first, second, third, and fourth weight-reducing long grooves S1, S2, S5, and S6, near the first, second, fifth, and sixth bolt holes H1, H2, H5, and H6, respectively, are provided with cast characters 1, 2, 5, and 6.
[0050] In the first and second weight-reducing short grooves S3 and S4, near the third and fourth bolt holes H3 and H4, respectively, are provided with cast characters 3 and 4.
[0051] It can be understood that these cast characters correspond to different bolt holes and clearly indicate the tightening sequence of the bolts. When installing the sealing gland, workers can tighten the bolts according to the cast character sequence to avoid uneven stress caused by incorrect tightening sequence, thereby preventing problems such as poor sealing or component deformation.
[0052] Specifically, the sealing gland is made of stainless steel by investment casting, and the first and second circular pipe interfaces 3 and 4 are provided with threads on the inner side, which are used to connect the heat exchange elements inserted into the inner container.
[0053] It can be understood that the threads provided on the inner side of the first and second circular pipe interfaces 3 and 4 are used to connect the heat exchange elements inserted into the inner container, and threaded connection is a common and reliable connection method. It can provide a large connection force, so that the heat exchange elements and the sealing gland are tightly connected together, and even if affected by factors such as vibration and pressure fluctuation during equipment operation, it can maintain a stable connection state, prevent the heat exchange elements from loosening or falling off, and ensure the normal progress of the heat exchange process.
[0054] Compared with the prior art, the beneficial effects of the utility model lie in that the first channel G1 and the second channel G2 are arranged between the first circular pipe interface 3 and the second circular pipe interface 4 of the sealing gland and the flange 1, which greatly widens the feeding channel of the casting, realizes the sequential solidification of the casting under the cooperation of the H-shaped structure process rib, improves the feeding capacity of the casting in the solidification process, and significantly reduces the risk of shrinkage cavity and shrinkage porosity of the casting. The H-shaped structure process rib and the folding edge 8 of the outer edge of the flange 1 jointly act, significantly improve the structural rigidity of the sealing gland, reduce the deformation of the sealing gland in the solidification and heat treatment process, improve the flatness of the part, and reduce the risk of hot water and steam leakage caused by warping or unevenness. The weight-reducing groove on the flange 1 is beneficial to reducing the weight of the part and reducing the manufacturing cost. The interval area between the weight-reducing short grooves reserves space for the pouring gate, and facilitates the polishing and cleaning of the pouring gate. The digital serial number in the weight-reducing groove is the sequence number of the bolt tightening, which prevents the sealing and reliability risks caused by the error of the worker's tightening operation sequence.
[0055] Embodiment 1
[0056] The structure is the same as the above invention scheme, and when in use, the rubber sealing gasket and the sealing gland are sequentially arranged on the inner container flange, the bolt holes are aligned, the bolts are passed through, and the bolts are tightened according to the digital sequence on the sealing gland. The heat exchange element is inserted from the circular pipe interface on the sealing gland and is fixed on the sealing gland through the thread.
[0057] Those skilled in the art can understand that the above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, and for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. An inner liner sealing cap, wherein the inner liner sealing cap is integrally formed in a disc structure, characterized in that, include: The flange and the chassis are connected by an arc-shaped transition, and the arc of the transition corresponds to the arc of the inner liner connecting flange. The upper surface of the chassis is provided with a first round pipe interface and a second round pipe interface. The first round pipe interface and the second round pipe interface have the same diameter. The first round pipe interface and the second round pipe interface are connected to the flange through a first channel and a second channel, respectively. The upper surface of the chassis is provided with an H-shaped structural process rib.
2. The inner liner sealing cap according to claim 1, characterized in that, The H-shaped structural process reinforcement includes a first side reinforcement and a second side reinforcement. The first and second side reinforcements are symmetrically distributed along the axis connecting the centers of the first and second round pipe interfaces. The lengths of the first and second side reinforcements are the same as the center distance between the first and second round pipe interfaces, and the heights of the first and second side reinforcements are the same as those of the first and second round pipe interfaces. The two ends of the first and second side reinforcements are connected to the first and second round pipe interfaces respectively through arc-shaped connecting reinforcements. The H-shaped structural process reinforcement also includes a middle reinforcement, which is connected to the midpoint of the first and second side reinforcements. The thickness and height of the middle reinforcement are the same as those of the first and second side reinforcements.
3. The inner liner sealing cap according to claim 1, characterized in that, The flange has a first bolt hole, a second bolt hole, a third bolt hole, a fourth bolt hole, a fifth bolt hole, and a sixth bolt hole. The first bolt hole, the second bolt hole, the third bolt hole, the fourth bolt hole, the fifth bolt hole, and the sixth bolt hole are symmetrically distributed about the geometric center of the sealing gland. The outer edge of the flange is provided with a folded edge that slopes downwards. The height of the folded edge is the same as the thickness of the flange, and the angle between the folded edge and the flange plane is 60°.
4. The inner liner sealing cap according to claim 3, characterized in that, The first and second round pipe interfaces are symmetrically distributed with the center line connecting the first and second bolt holes as the axis of symmetry, and the top surfaces of the first and second round pipe interfaces are flush with the top surface of the flange.
5. The inner liner sealing cap according to claim 1, characterized in that, The width of the first channel and the second channel is equal to the inner diameter of the first circular pipe interface and the second circular pipe interface, and the height of the first channel and the second channel is the same as that of the first circular pipe interface and the second circular pipe interface.
6. The inner liner sealing cap according to claim 3, characterized in that, A first weight-reducing long groove, a third weight-reducing long groove, a second weight-reducing long groove, and a fourth weight-reducing long groove are provided between the first bolt hole and the third bolt hole, between the first bolt hole and the fifth bolt hole, between the second bolt hole and the fourth bolt hole, and between the second bolt hole and the sixth bolt hole. The depth of the first weight-reducing long groove, the third weight-reducing long groove, the second weight-reducing long groove, and the fourth weight-reducing long groove is 1mm. The first and fourth weight-reducing long slots are symmetrically distributed with the third and second weight-reducing long slots via the center line connecting the first and second bolt holes, which is the axis of symmetry. The first and third weight-reducing long slots are symmetrically distributed with the fourth and second weight-reducing long slots via the center line connecting the first and second round pipe interfaces.
7. The inner liner sealing cap according to claim 6, characterized in that, A first weight-reducing groove and a third weight-reducing groove are provided between the third bolt hole and the sixth bolt hole, and a second weight-reducing groove and a fourth weight-reducing groove are provided between the fourth bolt hole and the fifth bolt hole. The depth of the first weight-reducing groove, the third weight-reducing groove, the second weight-reducing groove and the fourth weight-reducing groove is 1 mm. The first and third weight-reducing short grooves are symmetrically distributed with the fourth and second weight-reducing short grooves via the center line connecting the first and second bolt holes, forming an axis of symmetry. The first and fourth weight-reducing short grooves are also symmetrically distributed with the third and second weight-reducing short grooves via the center line connecting the first and second round pipe interfaces. The spacing between the first and third weight-reducing short grooves is the same as the spacing between the fourth and second weight-reducing short grooves, and is not less than the width of the first and second channels.
8. The inner liner sealing cap according to claim 7, characterized in that, The first, second, third, and fourth weight-reduction long grooves are respectively provided with the characters 1, 2, 5, and 6 near the first bolt hole, second bolt hole, fifth bolt hole, and sixth bolt hole. The first and second weight-reducing short grooves are respectively provided with the characters 3 and 4 near the third and fourth bolt holes.
9. The inner liner sealing cap according to claim 1, characterized in that, The sealing cap is made of stainless steel by investment casting. The first and second round pipe interfaces are provided with threads on their inner sides. The threads are used to connect the heat exchange element inserted into the inner liner.