A sealing and pressing load compensating device

Abstract

The present invention discloses a sealing and pressing load compensating device, which includes a cavity with an inner cavity, a sealing cover capable of sliding axially relative to the inner cavity, an elastic seal, a support assembly, and an energy storage device. Axially along the inner cavity, the elastic seal abuts between the cavity and the sealing cover. The support assembly includes a gland, and the gland is fixedly arranged on the cavity. The energy storage device includes a first connecting member and a second connecting member. The axis lines of the first connecting member and the second connecting member are arranged collinearly, and the extending direction of the axis line is parallel to the axial direction of the inner cavity. The first connecting member is connected to the second connecting member in a relatively slidable manner along the extending direction of the axis line. The energy storage device further includes an elastic member for providing the acting force required for the first connecting member to move away from the second connecting member. Axially along the inner cavity, the energy storage device abuts between the sealing cover and the gland. This sealing and pressing load compensating device can maintain sealing between the sealing cover and the cavity under different working conditions, with stable working performance and high safety.

Description

Technical Field

[0001] The present invention relates to the field of sealing devices, and particularly to a sealing compression load compensable device. Background Art

[0002] In industrial equipment used in fields such as nuclear power, thermal power, chemical industry, and energy, there are many devices or structures involving sealing conditions, such as heat exchangers, reaction vessels, pipeline seals, etc. When these devices are in use, they often have harsh working conditions such as high temperature, high pressure, accompanied by thermal shock (thermal cycle), and medium pressure fluctuation. In such devices, due to factors such as the difference in thermal expansion coefficients of their respective component materials, high-temperature creep of metal materials, and fatigue, the contact stress between relevant compression components will change, or relative displacement or even separation will occur between two contacting components, resulting in functional failure. For example, in the case of equipment flange sealing: when the contact surface between the flange and the sealing gasket alternates in temperature and pressure, due to factors such as high-temperature creep of the flange and bolts and the thrust of the medium, the contact stress between the sealing gasket and the flange surface decreases, or relative displacement or even separation occurs between the two, resulting in the loss of sealing working stress, causing sealing leakage, and even the internal medium being blown out, causing safety accidents. Summary of the Invention

[0003] The purpose of the present invention is to provide a device with good sealing effect and compensable sealing compression load in view of the problems existing in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A sealing compression load compensable device includes a cavity having an inner cavity, a sealing cover slidably disposed axially relative to the inner cavity in the inner cavity, and an elastic seal. Axially along the inner cavity, the elastic seal abuts between the cavity and the sealing cover. The sealing compression load compensable device further includes a support assembly and an energy storage device. The support assembly includes a gland, the gland is fixedly disposed on the cavity, and the gland is located on the side of the sealing cover axially away from the elastic seal along the inner cavity. The energy storage device includes a first connecting member and a second connecting member. The axis lines of the first connecting member and the second connecting member are collinearly arranged, and the extending direction of the axis line is parallel to the axial direction of the inner cavity. The first connecting member is slidably connected to the second connecting member along the extending direction of the axis line. The energy storage device further includes an elastic member for providing the acting force required for the first connecting member to move away from the second connecting member. Axially along the inner cavity, the energy storage device abuts between the sealing cover and the gland.

[0006] Preferably, the axis lines of the first connecting member, the second connecting member, and the elastic member are collinearly arranged. The first connecting member has a first pressing piece, and the second connecting member has a second pressing piece. Along the extending direction of the axis line, the first pressing piece and the second pressing piece are respectively disposed at two ends of the energy storage device, and the elastic member abuts between the first pressing piece and the second pressing piece.

[0007] More preferably, the first connecting member has a first shaft fixed on the first pressing piece, the second connecting member has a second shaft fixed on the second pressing piece, a sliding guiding structure is provided between the first shaft and the second shaft, and the elastic member is sleeved on the first shaft and the second shaft at the same time.

[0008] More preferably, the outer diameters of the first pressing piece and the second pressing piece are equal, and the outer diameter of the elastic member is not greater than the outer diameter of the first pressing piece.

[0009] Preferably, the support assembly further includes a load transfer disk. Along the axial direction of the inner cavity, the load transfer disk is disposed between the gland and the energy storage device, the second connecting member abuts against the load transfer disk, and in a plane perpendicular to the axial direction of the inner cavity, the projection of the energy storage device is located inside the projection of the load transfer disk.

[0010] Preferably, an installation bracket is fixedly provided on the sealing cover. Along the axial direction of the inner cavity, the installation bracket is located between the gland and the sealing cover. An installation hole is formed on the side of the installation bracket facing the gland, at least a part of the energy storage device is inserted into the installation hole, and the first connecting member is fixedly connected to the installation bracket.

[0011] Preferably, when the elastic member is at the compression elastic limit, the length of the energy storage device is L min , and the depth of the installation hole is equal to L min .

[0012] Preferably, multiple groups of the energy storage devices are circumferentially spaced along the gland.

[0013] Preferably, the gland is threadedly engaged with the inner side wall of the cavity.

[0014] Preferably, the sealing cover and the elastic sealing member divide the inner cavity into a working cavity and an installation cavity that are not communicated with each other. The working cavity is filled with a medium, and the gland and the energy storage device are located in the installation cavity.

[0015] Preferably, an installation platform protruding radially inward along the inner cavity is provided on the inner circumferential wall of the cavity. The installation platform has an installation surface facing the sealing cover, and two opposite sides of the elastic sealing member in the thickness direction thereof respectively abut against the installation surface and the sealing cover.

[0016] Preferably, the support assembly further includes a compression bolt and a pressing ring. The pressing cover is provided with a plurality of through holes at intervals along its circumference, and each through hole extends along the axial direction of the inner cavity. An annular groove is formed on one side of the pressing cover close to the energy storage device, and the annular groove communicates with all the through holes. The pressing ring is arranged in the annular groove, and a compression bolt is inserted into each through hole.

[0017] More preferably, multiple groups of energy storage devices are arranged at intervals along the circumference of the pressing cover. The number of the energy storage devices is the same as the number of the through holes, and the positions of the energy storage devices correspond to those of the through holes one by one.

[0018] More preferably, the support assembly further includes a pressure rod. A pressure rod is inserted into each through hole, and two end portions of the pressure rod along its length direction respectively abut against the compression bolt and the pressing ring.

[0019] Due to the application of the above technical solution, the sealing and pressing load compensating device provided by the present invention can, by arranging an axially telescopic energy storage device between the sealing cover and the pressing cover, compensate the axial pressing load required for the sealing cover to press the elastic sealing member, and can keep the sealing cover and the cavity sealed under different working conditions, so that the working performance of the device is stable and the safety is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0021] Att Figure 1 is a schematic structural diagram of the sealing and pressing load compensating device in a specific embodiment of the present invention;

[0022] Att Figure 2 is Figure 1 an enlarged schematic view of part A in, where the device is in the first working condition;

[0023] Att Figure 3 is Figure 1 an enlarged schematic view of part A in, where the device is in the second working condition and the energy storage device does not compensate the load;

[0024] AttFigure 4 is Figure 1 The enlarged schematic view at position A in the figure, where the device is in the second working condition and the energy storage device compensates for the load;

[0025] Appendix Figure 5 is the schematic structural view of the energy storage device in the energy release state in this embodiment;

[0026] Appendix Figure 6 is the schematic structural view of the energy storage device in the energy storage state in this embodiment;

[0027] Wherein: 1000, cavity; 1010, inner cavity; 1011, working cavity; 1012, installation cavity; 1100, installation table; 1100a, installation surface; 2000, sealing cover; 3000, elastic sealing member; 4000, energy storage device; 4100, first connecting member; 4110, first pressing piece; 4120, first shaft; 4200, second connecting member; 4210, second pressing piece; 4220, second shaft; 4300, elastic member; 4400, guiding member; 4401, limiting head; 4500, guiding hole; 4501, limiting boss; 4600, threaded hole; 5000, gland; 5001, thread; 5100, tightening bolt; 5200, pressing rod; 5300, pressing ring; 6000, load transfer disc; 7000, mounting bracket; 7001, mounting hole; 7002, mounting bolt; X, the axial direction of the inner cavity; Y, the axis line. Detailed implementation manners

[0028] The following elaborates on the preferred embodiments of the present invention in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, but they do not limit the present invention.

[0029] Refer to Figures 1 to 4 As shown, it is a device for compensating the sealed pressing load. This device can be a sealed container or a reactor, etc., and includes a cavity 1000, a sealing cover 2000, and an elastic sealing member 3000. Among them, the cavity 1000 has a hollow barrel-shaped inner cavity 1010, the sealing cover 2000 can be slidably arranged in the inner cavity 1010 along the axial direction X of the inner cavity, and the elastic sealing member 3000 abuts between the cavity 1000 and the sealing cover 2000 to achieve the sealed connection between the two.

[0030] In this embodiment, an installation platform 1100 that protrudes radially inward along the inner cavity 1010 is provided on the inner circumferential wall of the cavity 1000. The installation platform 1100 has an installation surface 1100a facing the sealing cover 2000. Thus, the two opposite sides of the elastic seal 3000 along its own thickness direction respectively abut against the installation surface 1100a and the sealing cover 2000. In this way, the sealing cover 2000 and the elastic seal 3000 divide the inner cavity 1010 into a non-communicating working cavity 1011 and an installation cavity 1012. The elastic seal 3000 is located on the side close to the working cavity 1011, and the working cavity 1011 communicates with the atmosphere.

[0031] In this embodiment, the sealing and pressing load compensating device further includes a support assembly disposed in the installation cavity 1012. The support assembly includes a gland 5000 and a pressing bolt 5100, a pressing rod 5200, a pressing ring 5300, etc. provided on the gland 5000. Among them, the gland 5000 is fixedly connected to the inner side wall of the cavity 1000 through a thread 5001. The gland 5000 is uniformly and spaced apart along its circumference and is provided with a plurality of through holes. The axis Y of each through hole is parallel to the axial direction X of the inner cavity; a circular groove is provided on the side of the gland 5000 close to the sealing cover 2000, and the circular groove communicates with all the through holes. The pressing bolts 5100 and the pressing rods 5200 are respectively provided with multiple groups spaced along the circumference of the gland 5000. Each group of pressing bolts 5100 and pressing rods 5200 corresponds to each other, and each group of pressing bolts 5100 and pressing rods 5200 is correspondingly inserted into a through hole, so that the axis Y of each group of through holes, pressing bolts 5100 and pressing rods 5200 extends collinearly. The pressing ring 5300 is disposed in the circular groove, so that the two end portions of each group of pressing rods 5200 respectively abut against the pressing bolt 5100 and the pressing ring 5300. In this way, by tightening the gland 5000 and the pressing bolt 5100, a certain pressing load can be applied to the sealing cover 2000, so that the elastic seal 3000 is pressed on the installation surface 1100a, realizing the seal between the working cavity 1011 and the installation cavity 1012.

[0032] When the device is in use, it has at least a first working condition and a second working condition. Among them, see Figure 2 As shown, the first working condition is the initial assembly state of the device. At this time, the support assembly can press the sealing cover 2000 tightly on the elastic seal 3000, and the elastic seal 3000 is subjected to an appropriate pre-tightening load, and can maintain the sealing isolation between the working cavity 1011 and the installation cavity 1012. See Figure 3As shown, in the second working condition, due to thermal deformation, creep and other deformations along the axial direction X of the inner cavity caused by the cavity 1000, the sealing cover 2000 or the support assembly, etc., the sealing cover 2000 has a tendency to separate from the elastic seal 3000, resulting in the lack of the sealing compression load required by the elastic seal 3000. The compression amount of the elastic seal 3000 decreases, and even separates from the sealing cover 2000 to generate a gap of ΔL, causing leakage between the working cavity 1011 and the installation cavity 1012, seriously affecting the working performance of the device and possibly causing safety accidents.

[0033] To solve the above problems, in this embodiment, a plurality of energy storage devices 4000 are arranged between the sealing cover 2000 and the support assembly to compensate for the reduced compression amount and compression load of the elastic seal 3000 in the second working condition, so that the sealing cover 2000 and the installation surface 1100a can maintain a seal.

[0034] See Figure 1 and Figure 2 As shown, specifically, the support assembly further includes a load transfer disk 6000 for uniformly transferring the compression load of the plurality of compression bolts 5100 and the pressure rod 5200 to the energy storage devices 4000. A circular installation bracket 7000 is fixedly provided on one side of the sealing cover 2000 close to the installation cavity 1012. A plurality of installation holes 7001 are provided on the side of the installation bracket 7000 facing the load transfer disk 6000 and are evenly spaced along the circumferential direction. Each group of energy storage devices 4000 is correspondingly inserted into a group of installation holes 7001, so that the plurality of energy storage devices 4000 can correspond one-to-one to the plurality of compression bolts 5100 and the pressure rod 5200. Each group of energy storage devices 4000 abuts between the load transfer disk 6000 and the installation bracket 7000 and can expand and contract along the extension direction of the axis Y, so as to apply a compression load towards the elastic seal 3000 to the sealing cover 2000 and compensate for the sealing compression load required by the sealing cover 2000 and the elastic seal 3000.

[0035] See Figure 5 and Figure 6 As shown, each group of energy storage devices 4000 is integrally cylindrical, and all its components are arranged collinearly with the axis Y. The energy storage device 4000 specifically includes a first connecting member 4100 and a second connecting member 4200 that are relatively slidably connected along the extension direction of the axis Y, and an elastic member 4300 for providing the acting force required for the first connecting member 4100 and the second connecting member 4200 to move away from each other. In this embodiment, in order to be applicable to a sealing compression load compensable device with high-temperature working conditions, each component such as the first connecting member 4100, the second connecting member 4200, and the elastic member 4300 of the energy storage device 4000 is made of a high-temperature resistant metal material.

[0036] The first connecting member 4100 has a first pressing piece 4110 and a first shaft 4120 fixed on the first pressing piece 4110. The outer diameter of the first pressing piece 4110 is larger than that of the first shaft 4120. The second connecting member 4200 has a second pressing piece 4210 and a second shaft 4220 fixed on the second pressing piece 4210. The outer diameter of the second pressing piece 4210 is larger than that of the second shaft 4220. Along the extending direction of the axis line Y, the first pressing piece 4110 and the second pressing piece 4210 are respectively arranged at two ends of the energy storage device 4000. The elastic member 4300 is sleeved on both the first shaft 4120 and the second shaft 4220 at the same time, and both ends of the elastic member 4300 along its own axial direction respectively abut against the first pressing piece 4110 and the second pressing piece 4210. In this embodiment, the outer diameters of the first pressing piece 4110 and the second pressing piece 4210 are equal, and the outer diameter of the elastic member 4300 is not larger than that of the first pressing piece 4110, so that the energy storage device 4000 can be stably inserted into the mounting hole 7001 and is not easy to shake.

[0037] Further, a sliding guiding structure is provided between the first shaft 4120 and the second shaft 4220, which includes a guiding member 4400 fixed on the first shaft 4120 and a guiding hole 4500 opened on the second shaft 4220. The guiding member 4400 can be inserted into the guiding hole 4500 in a relatively sliding manner along the extending direction of the guiding hole 4500 (i.e., the extending direction of the axis line Y). In order to limit the sliding separation of the first connecting member 4100 and the second connecting member 4200, one end of the guiding member 4400 away from the first shaft 4120 further has a limiting head 4401, and a limiting boss 4501 is arranged on one side of the guiding hole 4500. The inner diameter of the limiting boss 4501 < the outer diameter of the limiting head 4401, so that the limiting head 4401 cannot slide out of the guiding hole 4500.

[0038] In addition, the sum of the lengths of the first shaft 4120 and the second shaft 4220 should be equal to the length of the elastic member 4300 when it is in the allowed maximum compression state (i.e., the compression elastic limit). Thus, when the energy storage device 4000 is subjected to the allowed maximum pressing load and the first shaft 4120 and the second shaft 4220 abut against each other, the elastic member 4300 will not be crushed and lose its elasticity, so as to protect the working performance of the energy storage device 4000. At this time, the length of the entire energy storage device 4000 is L min 。

[0039] As above, the setting of the energy storage device 4000 enables the first connecting member 4100, the second connecting member 4200 and the elastic member 4300 to interact with each other along the extending direction of the axis line Y. The load exerted by the energy storage device 4000 on the outside is negatively correlated with its length. See Figure 5As shown, when no external load is applied, the energy storage device 4000 is in an energy release state. The elastic member 4300 is fully released and pushes the first connecting member 4100 and the second connecting member 4200 away from each other. The energy storage device 4000 freely elongates, and the load it exerts on the outside is 0. Refer to Figure 6 As shown, when the external load increases, the energy storage device 4000 is in an energy storage state. The first connecting member 4100 and / or the second connecting member 4200 are squeezed towards each other, and thus the elastic member 4300 is compressed, and the energy storage device 4000 shortens. When the external load is large, the first shaft 4120 and the second shaft 4220 are completely in contact. The energy storage device 4000 is in a compressed state, and the elastic member 4300 is compressed to the limit. However, due to the limiting effect of the first shaft 4120 and the second shaft 4220, the elastic member 4300 can be protected from being crushed. At this time, the load exerted by the energy storage device 4000 on the outside is the largest.

[0040] In this embodiment, a threaded hole 4600 is provided on the first connecting member 4100, so that the energy storage device 4000 can be fixedly connected to the mounting bracket 7000 through the mounting bolt 7002. The outer end of the second connecting member 4200 is flush with the opening of the mounting hole 7001 or partially extends outside the mounting hole 7001, so that the second connecting member 4200 can abut against the load transfer disc 6000. Thus, the energy storage device 4000 is equivalent to abutting between the sealing cover 2000 and the gland 5000 along the axial direction X of the inner cavity, so that the sealing cover 2000 is arranged on an elastic support. Multiple energy storage devices 4000 can simultaneously apply a load towards the mounting surface 1100a to the sealing cover 2000 to provide a sealing compression load compensation for the sealing cover 2000.

[0041] Furthermore, the depth of each of the above-mentioned mounting holes 7001 should be equal to L min so that the mounting bracket 7000 can play a role of limiting and protecting the energy storage device 4000 from the outside. When the load on the sealing cover 2000 towards the gland 5000 is large, the mounting bracket 7000 completely abuts against the load transfer disc 6000. The elastic member 4300 is in the maximum allowable compression state and will not be further compressed. The excess load will be borne by support components such as the load transfer disc 6000, thus playing a role in preventing the overall overpressure and damage of the energy storage device 4000.

[0042] In this embodiment, in the plane perpendicular to the axial direction X of the inner cavity, the projection of the load transfer disc 6000 is an annular shape, and the projections of all the energy storage devices 4000 are located inside this annular shape. That is, the load transfer disc 6000 completely covers all the energy storage devices 4000 in the direction of applying the load, making the load transfer more uniform.

[0043] In other embodiments, the load transfer disk 6000 may not be provided. In this case, it should be required that in the plane perpendicular to the axial direction X of the inner cavity, the projection of the pressure ring 5300 completely covers the projection of the energy storage device 4000, and the pressure ring 5300 is used to achieve uniform and stable load transfer.

[0044] In this embodiment, the seal compression load compensating device further has a third working condition. In the third working condition, the mounting surface 1100a has a tendency to move towards the seal cover 2000, so that the elastic seal 3000 is further compressed, and the compression load is transmitted to the energy storage device 4000, so that the energy storage device 4000 is further compressed compared with the first working condition. Relatively, the energy storage device 4000 also provides a greater compression load to the seal cover 2000 and the elastic seal 3000 compared with the first working condition.

[0045] The working principle of the seal compression load compensating device is specifically described as follows:

[0046] See Figure 2 As shown, in the first working condition, all components are initially assembled, the energy storage device 4000 is appropriately compressed, a certain pre-tightening load is provided to the seal cover 2000, and the working cavity 1011 is sealed.

[0047] See Figure 4 As shown, in the second working condition, as described above, the seal cover 2000 has a tendency to move away from the elastic seal 3000 and the mounting surface 1100a. At this time, under the action of the elastic member 4300, the first connecting member 4100 and the second connecting member 4200 move away from each other, and the length of each group of energy storage devices 4000 gradually elongates. The second connecting member 4200 remains stationary on the load transfer disk 6000, and the first connecting member 4100 applies a compression load slightly smaller than the pre-tightening load to the seal cover 2000 and pushes the seal cover 2000 towards the mounting surface 1100a, so that the seal cover 2000 can still be in contact with the elastic seal 3000 and ensure sufficient sealing working stress without leakage. Correspondingly, due to the elongation of the length of the energy storage device 4000, a gap of ΔL will appear between the mounting bracket 7000 and the load transfer disk 6000 under the push of the first connecting member 4100.

[0048] In the third working condition, the seal cover 2000 and the mounting surface 1100a approach each other again, the energy storage device 4000 is further compressed, and the length of the energy storage device 4000 gradually shortens, and the compression load provided by it increases. However, due to the limiting effect of the first shaft 4120 and the second shaft 4220, and the limiting effect of the mounting bracket 7000, when the energy storage device 4000 compresses the elastic seal 3000, it can ensure that the elastic member 4300 will not be crushed and the energy storage device 4000 will not be damaged by overpressure.

[0049] In this way, regardless of the changes in the sealing pressing load compensating device under any working conditions, the accumulator 4000 can always provide the pressing load required for sealing to the sealing cover 2000, so as to keep the working cavity 1011 and the installation cavity 1012 sealed and isolated from each other.

[0050] In some more specific embodiments, the lack of the above-mentioned pressing load may be caused by inconsistent thermal deformation of materials. For example, the cavity 1000 is made of a first material, and the sealing cover 2000 is made of a second material, and the linear expansion coefficient α1 of the first material < the linear expansion coefficient α2 of the second material. In the first working condition, the temperature in the working cavity 1011 = the temperature in the installation cavity 1012 = room temperature; in the second working condition, the temperature in the installation cavity 1012 remains unchanged at room temperature, and the temperature in the working cavity 1011 increases. In this way, in the second working condition, the sealing cover 2000 has a tendency to expand towards the installation cavity 1012 faster than the cavity 1000, resulting in the sealing cover 2000 being relatively far away from the installation surface 1100a and the elastic seal 3000. The setting of the accumulator 4000 can keep the sealing cover 2000 tightly pressed on the elastic seal 3000 to maintain the seal.

[0051] To sum up, in the sealing pressing load compensating device of this embodiment, regardless of the lack of the pressing load of the elastic seal 3000 caused by any reason, it can provide real-time sealing pressing load compensation, so that the sealing cover 2000, the elastic seal 3000 and the installation surface 1100a keep sealed contact, are not easy to leak, the device operation performance is stable and reliable, and the safety is greatly improved.

[0052] The above embodiments are only used to illustrate the technical concept and features of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sealing and pressing load compensating device, characterized in that: It includes a cavity with an inner cavity, a sealing cover that can be slidably arranged axially relative to the inner cavity in the inner cavity, and an elastic seal. Axially along the inner cavity, the elastic seal abuts between the cavity and the sealing cover. The seal compression load compensating device further includes a support assembly and an energy storage device. The support assembly includes a gland, the gland is fixedly arranged on the cavity, and the gland is located on the side of the sealing cover axially away from the elastic seal along the inner cavity. The energy storage device includes a first connecting member and a second connecting member. The axis lines of the first connecting member and the second connecting member are arranged collinearly, and the extending direction of the axis line is parallel to the axial direction of the inner cavity. The first connecting member can be slidably connected to the second connecting member along the extending direction of the axis line. The energy storage device further includes an elastic member for providing the acting force required for the first connecting member to move away from the second connecting member. Axially along the inner cavity, the energy storage device abuts between the sealing cover and the gland. The support assembly further includes a load transfer disc. Axially along the inner cavity, the load transfer disc is arranged between the gland and the energy storage device. The second connecting member abuts against the load transfer disc. In a plane perpendicular to the axial direction of the inner cavity, the projection of the energy storage device is located inside the projection of the load transfer disc.

2. The seal pressing load compensable device according to claim 1, characterized in that: The axis lines of the first connecting member, the second connecting member, and the elastic member are arranged collinearly. The first connecting member has a first pressing piece, and the second connecting member has a second pressing piece. Along the extending direction of the axis line, the first pressing piece and the second pressing piece are respectively arranged at two ends of the energy storage device. The elastic member abuts between the first pressing piece and the second pressing piece.

3. The seal pressing load compensable device according to claim 2, characterized in that: The first connecting member has a first shaft fixedly arranged on the first pressing piece, and the second connecting member has a second shaft fixedly arranged on the second pressing piece. A sliding guiding structure is arranged between the first shaft and the second shaft. The elastic member is sleeved on the first shaft and the second shaft at the same time.

4. The seal pressing load compensable device according to claim 2, characterized in that: The outer diameters of the first pressing piece and the second pressing piece are equal, and the outer diameter of the elastic member is not greater than the outer diameter of the first pressing piece.

5. The seal pressing load compensable device according to claim 1, characterized in that: An installation bracket is fixedly arranged on the sealing cover. Axially along the inner cavity, the installation bracket is located between the gland and the sealing cover. An installation hole is opened on the side of the installation bracket facing the gland. At least a part of the energy storage device is inserted into the installation hole, and the first connecting member is fixedly connected to the installation bracket.

6. The seal pressing load compensable device according to claim 5, characterized in that: When the elastic member is at the compression elastic limit, the length of the energy storage device is Lmin, and the depth of the installation hole is equal to Lmin.

7. The sealing and pressing load compensable device according to any one of claims 1 to 6, characterized in that: There are multiple groups of the energy storage devices arranged at intervals along the circumferential direction of the gland; and / or, The gland and the inner side wall of the cavity are connected by screw threads; and / or, The sealing cover and the elastic seal divide the inner cavity into a non-communicating working cavity and an installation cavity. The working cavity is filled with a medium, and the gland and the energy storage device are located in the installation cavity; and / or, An installation platform protruding radially inward along the inner cavity is provided on the inner circumferential wall of the cavity. The installation platform has an installation surface facing the sealing cover, and opposite sides of the elastic sealing member in the thickness direction thereof respectively abut against the installation surface and the sealing cover.

8. The sealed pressing load compensable device according to any one of claims 1 to 6, characterized in that: The support assembly further includes a compression bolt and a compression ring. The pressing cover is provided with a plurality of through holes spaced apart along its circumference, and each of the through holes extends along the axial direction of the inner cavity. An annular groove is formed on a side of the pressing cover close to the energy storage device, and the annular groove communicates with all the through holes. The compression ring is disposed in the annular groove, and a compression bolt is inserted into each of the through holes.

9. The seal pressing load compensable device according to claim 8, characterized in that: The energy storage devices are provided in multiple groups spaced apart along the circumference of the pressing cover. The number of the energy storage devices is the same as the number of the through holes, and the positions of the energy storage devices correspond to those of the through holes one by one; and / or, The support assembly further includes a pressure rod. A pressure rod is inserted into each of the through holes, and two end portions of the pressure rod in the length direction thereof respectively abut against the compression bolt and the compression ring.

Images