Pull rod upper sealing device suitable for high-temperature working condition

Abstract

The utility model discloses a pull rod upper sealing device suitable for a high-temperature working condition, and belongs to the technical field of pull rod sealing. The pull rod sealing device comprises an upper sealing cylinder and a lower sealing cylinder which are in up-and-down sealing sleeve joint, and the upper sealing cylinder and the lower sealing cylinder can perform axial relative movement to adapt to up-and-down movement of a pull rod; the upper sealing cylinder is hermetically connected with a compensation ring, and the lower sealing cylinder is hermetically connected with a draw-bar box; the compensation ring is used for being arranged on the pull rod in a sealing and sleeving mode and synchronously moves along with the pull rod, and the upper sealing cylinder and the compensation ring can perform radial relative movement so as to adapt to swing of the pull rod. Through the arrangement of the compensation ring, dynamic sealing between the pull rod and the compensation ring is changed into static sealing, and therefore the problem that the pull rod is prone to abrasion and loss can be thoroughly solved; meanwhile, the compensation ring and the pull rod move synchronously, so that elastic compensation is not needed any more; at the moment, the compensation ring can be a metal sealing ring with higher high-temperature resistance, so that the service life of the compensation ring is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of pull rod sealing, more particularly to a pull rod upper sealing device suitable for high temperature working condition. BACKGROUND

[0002] The coal mill is the key equipment for crushing blocky materials such as coal into powder materials, and its main working process is as follows: the materials fall into the millstone from the coal falling pipe, the driving device drives the main shaft to rotate to drive the millstone to rotate, and the materials move to the annular groove at the edge of the millstone under the action of centrifugal force; at this time, the pull rod drives the grinding roller to press down to crush the materials; the crushed materials are carried into the separator at the upper part of the coal mill by the hot air at the edge of the millstone, and under the action of the separator, the coarse coal powder falls onto the millstone for regrinding, and the qualified fine coal powder is discharged with the airflow, which can be collected by the dust collection device to obtain the corresponding coal powder.

[0003] When the coal mill is working, in order to smoothly send the coal powder out of the coal mill with the airflow, the hot air will form a large air pressure inside the coal mill, which on the one hand dries the sent coal powder, and on the other hand sends the coal powder out of the coal powder outlet at the upper part of the coal mill, which will cause the coal powder to appear the phenomenon of finding a way out under the action of the internal air pressure. Since the pull rod needs to move axially and also has a certain degree of radial swing during the actual working process of the coal mill, the sealing of the pull rod is relatively difficult, and there must be a large gap between the pull rod and the pull rod box to ensure that the pull rod has enough swing space, which will cause the coal powder to drill out from the gap between the pull rod and the pull rod box under the action of the air pressure, resulting in the leakage of the coal powder and the pollution of the environment. Therefore, the existing coal mill generally sets a pull rod upper sealing structure between the upper part of the pull rod box and the pull rod, and a pull rod lower sealing structure between the lower part of the pull rod box and the pull rod, and the upper sealing structure and the lower sealing structure form a sealed air chamber through the pull rod box and the pull rod, and the coal mill blows sealing air into the sealed air chamber during working to compensate the air pressure of the hot air in the coal mill, preventing the coal powder from leaking under the action of the hot air.

[0004] As in the patent CN205371631U, a coal mill pull rod sealing device is disclosed. The application includes a pull rod, a pull rod sealing air chamber, an upper sealing and a lower sealing; the upper sealing is provided with an upper sealing elastic body, the outer side of the upper sealing elastic body has a conical surface, and the inner side has a circular arc groove. The application sets an upper sealing shell circular gap between the upper sealing shell and the upper sealing connecting plate, and a lower sealing shell circular gap between the lower sealing shell and the lower sealing elastic body, to adapt to the up-down movement and radial swing of the pull rod, thereby solving the problem of easy wear between the pull rod and the upper and lower sealings, and the phenomenon of powder leakage.

[0005] For example, in the patent CN219035547U, a sealing device and a coal mill pull rod sealing structure are disclosed. The application includes a first mounting seat and a second mounting seat, a sealing assembly is arranged between the first mounting seat and the second mounting seat, and a protection assembly is arranged on the first mounting seat. The protection assembly includes a dust brush and a dust ring, both of which are annular and arranged in an upper and lower distribution. During operation, the sealing assembly dynamically seals the pull rod, and the protection assembly protects the sealing assembly from above. The dust brush can clean the dust attached to the outer surface of the pull rod in time, and the dust ring can effectively prevent dust particles from entering the contact surface between the sealing member and the pull rod, thereby effectively reducing the wear of the sealing member, prolonging the service life of the sealing member, and ensuring the sealing effect.

[0006] The above-mentioned applications all relate to technical improvements for sealing the pull rod of a coal mill, and all have certain improvement effects, but still have certain optimization space. For example, in the above two applications, in order to enable the sealing member to have a certain elastic compensation to ensure that the pull rod can always be tightly attached to the sealing member during movement, an organic material sealing member with good elastic compensation performance is usually selected. Although this sealing member can well adapt to the movement of the pull rod and ensure the sealing performance, the organic material sealing member has poor high-temperature resistance when the pull rod is in a high-temperature working environment, resulting in a large replacement frequency, which is not conducive to the continuous production and cost saving. In addition, in the above-mentioned applications, the outer peripheral wall of the pull rod is used as a sealing surface, and during the up-down movement and radial swinging of the pull rod, not only the sealing member will be worn, but also the outer periphery of the pull rod will be worn to a certain extent. Especially when the sealing surface enters the coal powder, the wear degree of the pull rod is greatly increased. Practical new type content

[0007] 1. Problem to be solved

[0008] In view of at least some problems existing in the prior art, the present application provides a pull rod upper sealing device suitable for high-temperature working conditions. By changing the dynamic sealing between the pull rod and the compensation ring to static sealing, the problem of easy wear and tear of the pull rod can be completely solved. At the same time, the compensation ring and the pull rod no longer need elastic compensation. At this time, the compensation ring can be selected as a more high-temperature-resistant metal sealing ring to prolong its service life.

[0009] 2. Technical scheme

[0010] In order to solve the above-mentioned problems, the technical scheme adopted by the present application is as follows:

[0011] The pull rod upper sealing device suitable for high-temperature working conditions comprises an upper sealing cylinder and a lower sealing cylinder which are connected in an upper and lower sealing sleeve, and the upper and lower sealing cylinders can move axially relative to each other.

[0012] The upper sealing cylinder is sleeved with a compensation ring, the compensation ring is arranged on the pull rod and moves synchronously with the pull rod, and the upper sealing cylinder and the compensation ring can move radially relative to each other.

[0013] The lower sealing cylinder is sleeved on the pull rod box, the lower sealing cylinder and the pull rod box can move radially relative to each other, and the relative movement between the two occurs after the relative movement between the compensation ring and the upper sealing cylinder is in place.

[0014] In some embodiments, the inner peripheral wall of the upper sealing cylinder is provided with a second ring platform, and the outer peripheral wall of the compensation ring is provided with a second ring groove for inserting the second ring platform; the radial movement between the upper sealing cylinder and the compensation ring is realized by the mutual cooperation between the second ring platform and the second ring groove.

[0015] In some embodiments, the outer peripheral wall of the compensation ring is provided with a second ring platform, and the inner peripheral wall of the upper sealing cylinder is provided with a second ring groove for inserting the second ring platform; the radial movement between the upper sealing cylinder and the compensation ring is realized by the mutual cooperation between the second ring platform and the second ring groove.

[0016] In some embodiments, the bottom of the lower sealing cylinder is provided with an annular boss, the inner wall of the annular boss is formed with a first ring groove, and the length of the upper edge of the first ring groove is longer than the length of the lower edge.

[0017] The outer peripheral wall of the pull rod box is formed with a first ring platform extending into the first ring groove.

[0018] In some embodiments, a dynamic sealing ring is arranged between the upper sealing cylinder and the lower sealing cylinder; the dynamic sealing ring is limited in a limiting groove on the upper sealing cylinder or the lower sealing cylinder.

[0019] In some embodiments, the upper sealing cylinder is sleeved on the outside of the lower sealing cylinder, and the limiting groove is arranged on the outer peripheral wall of the lower sealing cylinder close to the top.

[0020] In some embodiments, the compensation ring is provided with a dustproof sealing ring at the outer ring of the upper part of the upper sealing cylinder, and the outer ring of the dustproof sealing ring is inclined.

[0021] In some embodiments, the compensation ring, the dynamic sealing ring and the dustproof sealing ring are all metal sealing rings.

[0022] The upper sealing cylinder, the lower sealing cylinder and the compensation ring are all designed in a split type, and the pull rod box introduces sealing air through a pipeline.

[0023] The utility model discloses a kind of upper seal device of pull rod suitable for high temperature working condition, including upper sealing cylinder and lower sealing cylinder in upper and lower sealing sleeve connection, and upper and lower sealing cylinder can be axially relatively moved between;

[0024] The upper sealing cylinder is sealingly connected with a compensation ring, and the lower sealing cylinder is sealingly connected with a pull rod box.

[0025] The compensation ring is a metal sealing ring.

[0026] In some embodiments, the inner peripheral wall of the upper sealing cylinder is provided with a second ring platform, and the outer peripheral wall of the compensation ring is provided with a second ring groove for inserting the second ring platform. The radial movement between the upper sealing cylinder and the compensation ring is realized by the cooperation of the second ring platform and the second ring groove.

[0027] In some embodiments, the upper sealing cylinder is sleeved on the lower sealing cylinder, and a dynamic sealing ring is arranged between the upper sealing cylinder and the lower sealing cylinder.

[0028] 3. Advantages

[0029] Compared with the prior art, the utility model has the following advantages:

[0030] (1) The upper sealing device of pull rod suitable for high temperature working condition of the utility model is characterized in that the dynamic sealing between the pull rod and the compensation ring is changed to static sealing through the synchronous movement between the compensation ring and the pull rod. On the one hand, the pull rod as a dynamic sealing surface can be prevented from being easily worn out. On the other hand, since there is no relative movement between the pull rod and the compensation ring, the problem of elastic compensation between the two can be considered, so that the compensation ring can be selected as a metal sealing ring with better high-temperature resistance, thereby solving the problem of short service life of traditional organic sealing rings caused by high temperature. At the same time, the axial movement between the upper sealing cylinder and the lower sealing cylinder can adapt to the up-and-down movement of the pull rod, and the radial movement between the upper sealing cylinder and the compensation ring can adapt to the swing of the pull rod.

[0031] (2) The upper sealing device of pull rod suitable for high temperature working condition of the utility model is characterized in that the lower sealing cylinder and the pull rod box can also relatively move in the radial direction, and the relative movement between the two occurs after the relative movement between the compensation ring and the upper sealing cylinder is in place. This design can not only adapt to the radial swing requirement of the pull rod, but also effectively reduce the size of the upper sealing cylinder in the radial direction, thereby saving the installation space of the upper sealing cylinder and avoiding interference with other components.

[0032] (3) The utility model discloses a kind of upper sealing device of pull rod suitable for high temperature working condition, sealing ring is equipped between upper sealing cylinder and lower sealing cylinder;Meanwhile, by introducing sealing air into pull rod box through pipeline, the sealing effect of entire sealing device can be further ensured.

[0033] (4) The utility model discloses a kind of upper sealing device of pull rod suitable for high temperature working condition, by the setting of compensation ring and inclined surface, on the one hand, the accumulation of coal powder at the junction of second ring table and second ring groove can be effectively prevented;On the other hand, in the radial movement of compensation ring, coal powder falling on the top of upper sealing cylinder can be cleaned using inclined surface. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structure schematic view of the utility model of a kind of upper sealing device of pull rod suitable for high temperature working condition;

[0035] Figure 2 It is front view of the utility model of a kind of upper sealing device of pull rod suitable for high temperature working condition;

[0036] Figure 3 It is Figure 2 middle A-A section view;

[0037] Figure 4 It is the structure schematic view of the utility model in pull rod box;

[0038] Figure 5 It is the structure schematic view of the utility model in upper sealing cylinder;

[0039] Figure 6 It is the structure schematic view of the utility model in lower sealing cylinder;

[0040] Figure 7 It is the structure schematic view of the utility model in compensation ring;

[0041] Figure 8 It is the assembly diagram between compensation ring and upper sealing cylinder in the utility model;

[0042] Figure 9 It is the assembly schematic view of the utility model of a kind of upper sealing device of pull rod suitable for high temperature working condition.

[0043] In the drawing: 100, pull rod;200, pull rod box;210, first ring table;220, pipeline;300, upper sealing cylinder;310, second ring table;400, lower sealing cylinder;410, first ring groove;420, limit slot;430, annular boss;500, compensation ring;510, second ring groove;600, dynamic sealing ring;700, dustproof sealing ring. DETAILED DESCRIPTION

[0044] In order to further understand the content of the present application, the present application will be described in detail in combination with the drawings.

[0045] In the description of the present application, it should be pointed out that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0046] As said in the background art, the high temperature resistance of the organic material sealing element in the prior art is poor, and its service life is greatly reduced in a high temperature environment, thereby leading to sealing failure. The most effective way that can be thought of is to replace the organic material sealing element with a more high-temperature-resistant sealing element, such as a metal sealing element, to meet the demand for high-temperature resistance. However, the metal sealing element lacks the necessary elastic compensation performance, and thus cannot well adapt to the movement of the pull rod, thereby leading to poor sealing effect. Therefore, it is difficult to directly replace it in actual production. The present application is a kind of sealing device for pull rod suitable for high temperature working condition, which aims to solve the problem that the organic material sealing element and the metal sealing element cannot be directly replaced.

[0047] The present application will be further described below in combination with specific embodiments.

[0048] As shown in Figures 1-3 and Figure 9 , the present application is a kind of sealing device for pull rod suitable for high temperature working condition, which includes pull rod box 200, upper sealing cylinder 300, lower sealing cylinder 400 and compensation ring 500. Wherein, the compensation ring 500 is used for sealing sleeve on the pull rod 100, and moves synchronously with the pull rod 100. The upper sealing cylinder 300 is sealingly connected with the compensation ring 500, and the relative movement between the two can be radial, to adapt to the swing of the pull rod 100. The lower sealing cylinder 400 is also sealingly connected with the upper sealing cylinder 300, and the relative movement between the two can be axial, to adapt to the up and down movement of the pull rod 100. And the lower sealing cylinder 400 is used for sealing connection with the pull rod box 200.

[0049] Specifically, referring to Figures 5-7As shown, in some optional embodiments, a second ring table 310 is arranged on the inner circumferential wall of the upper sealing cylinder 300, and the outer circumferential wall of the compensation ring 500 is provided with a second ring groove 510 for inserting the second ring table 310. Through the mutual cooperation between the second ring table 310 and the second ring groove 510, the radial movement between the upper sealing cylinder 300 and the compensation ring 500 can be realized, so as to meet the circumferential swing of the pull rod 100.

[0050] In other optional embodiments, the outer circumferential wall of the compensation ring 500 is provided with a second ring table 310, and the inner circumferential wall of the upper sealing cylinder 300 is provided with a second ring groove 510 for clamping the second ring table 310, so as to realize the radial movement between the upper sealing cylinder 300 and the compensation ring 500.

[0051] The pull rod upper sealing device of the embodiment is suitable for high-temperature working conditions. In order to ensure the sealing performance during the relative movement of the upper sealing cylinder 300 and the lower sealing cylinder 400, a dynamic sealing ring 600 is arranged between the upper sealing cylinder 300 and the lower sealing cylinder 400, and the dynamic sealing ring 600 is limited in the limiting groove 420 on the upper sealing cylinder 300 or the lower sealing cylinder 400. Of course, the dynamic sealing ring 600 can be provided with a plurality of dynamic sealing rings along the axial direction of the lower sealing cylinder 400, so as to further ensure the sealing effect between the upper sealing cylinder and the lower sealing cylinder. At the same time, a pipeline 220 is arranged on the pull rod box 200, which is used for introducing sealing air into the sealing cavity of the pull rod box 200, so as to improve the sealing performance of the whole device.

[0052] In some optional embodiments, the upper sealing cylinder 300 is arranged on the outside of the lower sealing cylinder 400, and the limiting groove 420 is arranged on the outer circumferential wall of the lower sealing cylinder 400. It is preferred to be arranged near the top of the lower sealing cylinder 400, so as to improve the movable stroke between the upper sealing cylinder and the lower sealing cylinder, and prevent the disengagement between the upper sealing cylinder 300 and the dynamic sealing ring 600, so as to cause the sealing failure. Of course, the limiting groove 420 can also be arranged on the inner circumferential wall of the upper sealing cylinder 300, so that the dynamic sealing ring 600 moves synchronously with the upper sealing cylinder 300. At this time, the limiting groove 420 needs to be arranged near the bottom of the upper sealing cylinder 300. It should be noted that no matter which way is adopted, the movable stroke between the upper sealing cylinder and the lower sealing cylinder needs to meet the up-down movement stroke of the pull rod 100. That is, during the up-down movement of the pull rod 100, the sealing performance between the dynamic sealing ring 600 and the upper sealing cylinder and the lower sealing cylinder needs to be maintained.

[0053] In some alternative embodiments, the dustproof sealing ring 700 is arranged at the outer ring of the upper sealing cylinder 300. Preferably, the outer ring of the dustproof sealing ring 700 is arranged in an inclined manner. By arranging the dustproof sealing ring 700, on the one hand, the accumulation of coal powder at the junction of the second ring table 310 and the second ring groove 510 can be effectively prevented; on the other hand, the coal powder falling on the top of the upper sealing cylinder 300 can be swept by the inclined surface of the dustproof sealing ring 700 during the radial movement of the compensation ring 500.

[0054] The pull rod upper sealing device of the embodiment is suitable for high-temperature working conditions. Since the compensation ring 500 and the pull rod 100 move synchronously, and the compensation ring 500 and the upper sealing cylinder 300 move radially and the upper sealing cylinder 300 and the lower sealing cylinder 400 move axially, the circumferential swing and the up-down movement of the pull rod 100 are met. Therefore, there is no relative movement between the compensation ring 500 and the pull rod 100, so that the dynamic sealing between the compensation ring 500 and the pull rod 100 is changed into static sealing. On the one hand, the outer peripheral wall of the pull rod 100 as a dynamic sealing surface is prone to wear. On the other hand, since there is no relative movement between the pull rod 100 and the compensation ring 500, the problem of elastic compensation between the two needs to be considered. At this time, the compensation ring 500 can be selected as a metal sealing ring with good high-temperature resistance, thereby solving the problem of short service life of the traditional organic sealing ring due to high temperature.

[0055] In addition, when the sealing air is used in the traditional elastic sealing element, when the sealing air enters the gap between the elastic sealing element and the pull rod 100. At this time, the elastic sealing element is prone to deformation under the long-term blowing of the sealing air with a certain air pressure (generally slightly greater than the air pressure of the hot air), thereby causing the gap to continuously increase, and increasing the problem of coal powder leakage. However, since the compensation ring 500 is a metal sealing ring in the embodiment, it has sufficient strength and is basically not deformed due to the existence of air sealing.

[0056] Of course, in order to adapt to the high-temperature environment, the upper sealing cylinder 300, the lower sealing cylinder 400, the dynamic sealing ring 600 and the dustproof sealing ring 700 in the embodiment can all be selected as metal sealing rings. It should be noted that the metal sealing ring as prior art can be directly obtained by market purchase or customized with specific size and shape, which is not limited here.

[0057] At the same time, in order to facilitate assembly, the upper sealing cylinder 300, the lower sealing cylinder 400 and the compensation ring 500 are all designed in a split type; and each split body is provided with a connecting lug with a hole, and then the two connecting lugs are locked by lock bolts to complete the assembly operation between the corresponding split bodies.

[0058] In this embodiment, the upper sealing device is located at the upper part of the pull rod 100 and moves up and down synchronously with the pull rod 100. In actual operation, a guide frame (not shown in the figure) is also provided at the upper part of the pull rod 100 to fix it. Due to the limited space in the vertical direction (axial direction of the pull rod), the upper sealing cylinder 300 will enter the guide frame when it moves upward synchronously with the pull rod 100. If the radial dimension of the upper sealing cylinder 300 is too large, it will interfere with the guide frame, thus affecting the normal movement of the pull rod 100.

[0059] Therefore, in this embodiment, the lower sealing cylinder 400 and the pull rod box 200 are also designed to allow radial relative movement. This relative movement occurs after the compensation ring 500 and the upper sealing cylinder 300 have reached their relative positions, thus compensating for the swing of the pull rod 100. This design, while satisfying the maximum radial swing of the pull rod 100, effectively reduces the radial dimension of the upper sealing cylinder 300, saving installation space and avoiding interference with other components.

[0060] Specifically, refer to Figure 3 , Figure 4 as well as Figure 6 As shown, a first annular platform 210 is provided on the outer peripheral wall of the suitcase 200, and a first annular groove 410 is provided on the inner wall of the lower sealing cylinder 400 for the first annular platform 210 to engage with. The radial movement between the lower sealing cylinder 400 and the suitcase 200 is achieved by the mutual cooperation between the first annular platform 210 and the first annular groove 410. Of course, the positions of the first annular platform 210 and the first annular groove 410 can also be interchanged; that is, the first annular platform 210 is provided on the lower sealing cylinder 400, and the first annular groove 410 is provided on the upper suitcase 200.

[0061] For ease of description, the radial movement distance between the upper sealing cylinder 300 and the compensating ring 500 is defined as the first movement distance; the radial movement distance between the lower sealing cylinder 400 and the pull rod box 200 is defined as the second movement distance. Of course, the total movement distance of the first and second movement distances must be greater than the maximum swing of the pull rod 100, where the maximum swing refers to the maximum swing amplitude of the pull rod 100 in a certain direction at its center position.

[0062] by Figure 9the paper surface direction in the figure, when the pull rod 100 swings to the left as a whole; at this time, the pull rod 100 drives the compensation ring 500 to move within a first moving distance range; when the swing amount of the pull rod 100 is greater than the first moving distance, at this time, the compensation ring 500 drives the lower sealing cylinder 400 to continue to move within a second moving distance range through the upper sealing cylinder 300 to meet the maximum swing requirement of the pull rod 100. That is, the maximum swing amount required by the pull rod 100 is provided by the first moving distance and the second moving distance, and the second moving distance is a compensation for the first moving distance; that is, when the swing amount of the pull rod 100 is small, the first moving distance can meet the swing requirement of the pull rod 100, and the second moving distance is not needed to make up.

[0063] Reference Figure 8 As shown in the figure, if only the first moving distance is used to meet the maximum swing amount of the pull rod, denoted as S. Then, before the pull rod 100 swings, the following conditions need to be met:

[0064] First, the first moving distance is at least S, that is, the distance L1 between the end of the second ring table 310 and the inner wall of the second ring groove 510 is at least S;

[0065] Second, the gap L2 between the end face where the opening of the second ring groove 510 is located and the inner wall of the upper sealing cylinder 300 is at least S;

[0066] Third, in order to prevent the second ring table 310 from moving out of the second ring groove 510 completely and causing sealing failure, the distance by which the second ring table 310 extends into the second ring groove 510 needs to be greater than S.

[0067] From the above analysis, when only the first moving distance is used to meet the maximum swing amount S of the pull rod, the radial dimension of the upper sealing cylinder 300 is at least the sum of the diameter of the pull rod 100 and 6 times the maximum swing amount S without considering the wall thickness. In the embodiment, since the first moving distance and the second moving distance are used to meet the maximum swing amount S of the pull rod, L1, L2 and L3 can be reduced to reduce the radial dimension of the upper sealing cylinder 300 to save installation space.

[0068] In the embodiment, the lower sealing cylinder 400 adopts a traditional cylindrical structure; at this time, the first ring groove 410 can only be provided on the inner wall of the lower sealing cylinder 400, but due to the influence of the wall thickness of the lower sealing cylinder 400, the opening depth of the first ring groove 410 is limited to a certain extent, which is not conducive to the increase of the second moving distance. Since the maximum swing amount of the pull rod 100 is provided by the first moving distance and the second moving distance, in the case of limited second moving distance, it is obviously not conducive to the reduction of the first moving distance, and finally the reduction of the radial dimension of the upper sealing cylinder 300 will also be limited to a certain extent.

[0069] To this end, in some optional embodiments, the lower sealing cylinder 400 is in the form of a stepped cylinder as a whole. Figure 6 As shown in the drawings, the bottom of the lower sealing cylinder 400 is provided with an annular boss 430 extending outward as a whole, and the inner wall of the annular boss 430 is formed with the first annular groove 410, so as to effectively increase the opening depth of the first annular groove 410, thereby facilitating the increase of the second moving distance, and further reducing the radial dimension of the upper sealing cylinder 300.

[0070] Further, the inner wall of the annular boss 430 is also stepped, and the inner diameter at the upper step is greater than that at the lower step. The first annular groove 410 covers at least the joint of the upper and lower steps, so that the length of the upper edge of the first annular groove 410 is greater than that of the lower edge. At this time, sufficient space can be left between the outer peripheral wall of the pull rod box 200 and the end of the lower edge to prevent interference with the movement of the lower sealing cylinder 400, and the longer length of the upper edge can effectively ensure the sealing area between the first annular groove 210 and the upper edge. Preferably, the lower sealing cylinder 400 and the annular boss 430 at the bottom thereof are integrally formed.

[0071] In some optional embodiments, in order to minimize the radial dimension of the upper sealing cylinder 300 to meet the installation requirements of the upper sealing cylinder 300 in a limited space, the maximum swing amount of the pull rod 100 can be completely provided by the second moving distance, i.e. the radial movement between the compensation ring 500 and the upper sealing cylinder 300 is not required. At this time, the compensation ring 500 and the upper sealing cylinder 300 can be connected in a fixed manner, and are preferably integrally formed.

[0072] The pull rod upper sealing device of the present embodiment is suitable for high-temperature working conditions, and uses the second moving distance as a supplement to the first moving distance to jointly meet the maximum swing amount of the pull rod 100, which can effectively reduce the radial dimension of the upper sealing cylinder 300 and provide a good basis for the installation and normal operation of the upper sealing cylinder 300 in a limited space.

[0073] The above description of the present utility model and its embodiments is illustrative and not limiting, and the embodiments shown in the drawings are only one of the embodiments of the present utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the present utility model, without departing from the creative concept of the present utility model, similar structural modes and embodiments can be designed without creativity, which should all fall within the protection scope of the present utility model.

Claims

1. A sealing device for tie rods suitable for high-temperature operating conditions, characterized in that: The upper sealing cylinder (300) and the lower sealing cylinder (400) are sealingly sleeved, and the upper and lower sealing cylinders can axially relatively move. The upper sealing cylinder (300) is sealingly sleeved with a compensation ring (500), the compensation ring (500) is used for being sealingly sleeved on the pull rod (100) and synchronously moving with the pull rod (100), and the upper sealing cylinder (300) and the compensation ring (500) can radially relatively move. The lower sealing cylinder (400) is sealingly sleeved on the pull rod box (200), the lower sealing cylinder (400) and the pull rod box (200) can radially relatively move, and the relative movement between the two occurs after the relative movement between the compensation ring (500) and the upper sealing cylinder (300) is in place.

2. The seal assembly of claim 1, wherein: The inner peripheral wall of the upper sealing cylinder (300) is provided with a second ring table (310), and the outer peripheral wall of the compensation ring (500) is provided with a second ring groove (510) for inserting the second ring table (310); or The outer peripheral wall of the compensation ring (500) is provided with a second ring table (310), and the inner peripheral wall of the upper sealing cylinder (300) is provided with a second ring groove (510) for inserting the second ring table (310). The radial movement between the upper sealing cylinder (300) and the compensation ring (500) is realized by the mutual cooperation between the second ring table (310) and the second ring groove (510).

3. The upper seal for tie rods for high temperature applications of claim 2, wherein: The bottom of the lower sealing cylinder (400) is provided with an annular boss (430), the inner wall of the annular boss (430) is formed with a first ring groove (410), and the upper edge of the first ring groove (410) is longer than the lower edge. The outer peripheral wall of the pull rod box (200) is formed with a first ring table (210) extending into the first ring groove (410).

4. A top seal assembly for use in high temperature service as in any of claims 1-3, wherein: The upper sealing cylinder (300) and the lower sealing cylinder (400) are provided with a dynamic sealing ring (600), and the dynamic sealing ring (600) is limited in a limiting groove (420) on the upper sealing cylinder (300) or the lower sealing cylinder (400).

5. A seal assembly for use in high temperature applications as in claim 4, wherein: The upper sealing cylinder (300) is sleeved outside the lower sealing cylinder (400), and the limiting groove (420) is formed on the outer peripheral wall of the lower sealing cylinder (400) close to the top.

6. A top seal assembly for use in high temperature service as in any one of claims 1-3, wherein: The compensation ring (500) is provided with a dustproof sealing ring (700) at the outer ring of the upper part of the upper sealing cylinder (300), and the outer ring of the dustproof sealing ring (700) is inclined.

7. A top seal assembly for use in high temperature service as defined in claim 6, wherein: The compensation ring (500), the dynamic sealing ring (600) and the dustproof sealing ring (700) are all metal sealing rings. The upper sealing cylinder (300), the lower sealing cylinder (400) and the compensation ring (500) are all designed in a split type, and the pull rod box (200) introduces sealing air through a pipeline (220).

8. A seal assembly for use in high temperature service on a tie rod, comprising: The upper sealing cylinder (300) and the lower sealing cylinder (400) are sealingly sleeved, and the upper and lower sealing cylinders can axially relatively move. The upper sealing cylinder (300) is sealingly connected with a compensation ring (500), and the lower sealing cylinder (400) is sealingly connected with the pull rod box (200); wherein the compensation ring (500) is used for sealingly sleeving on the pull rod (100) and moving synchronously with the pull rod (100), and the upper sealing cylinder (300) and the compensation ring (500) can move radially relative to each other. The compensation ring (500) is a metal sealing ring.

9. A top seal assembly for use in high temperature service as defined in claim 8, wherein: The inner peripheral wall of the upper sealing cylinder (300) is provided with a second ring table (310), the outer peripheral wall of the compensation ring (500) is provided with a second ring groove (510) for inserting the second ring table (310), and the radial movement between the upper sealing cylinder (300) and the compensation ring (500) is realized by the cooperation of the second ring table (310) and the second ring groove (510).

10. A seal assembly for use in high temperature applications according to claim 8 or 9, wherein: The upper sealing cylinder (300) is sleeved on the lower sealing cylinder (400), and a dynamic sealing ring (600) is arranged between the upper sealing cylinder (300) and the lower sealing cylinder (400); the dynamic sealing ring (600) is limited in the limiting groove (420) of the lower sealing cylinder (400).

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