Multi-layer sealing packing gland structure and using method thereof

Abstract

The invention provides a multi-layer sealing packing gland structure and a using method thereof. The multi-layer sealing packing gland structure comprises a movable rod. The base body is connected to the outer side of the movable rod in a sleeving mode, a first containing groove is formed in the side, connected with the movable rod, of the base body, a plurality of first filling bodies are arranged in the first containing groove, and the longitudinal section of each first filling body is trapezoidal or triangular; the pressing piece is arranged on the outer side of the movable rod in a sleeving mode and located above the base body, a second containing groove is formed in the side, connected with the movable rod, of the pressing piece, a plurality of second filling bodies are arranged in the second containing groove, the longitudinal section of each second filling body is trapezoidal or triangular, and the bottom of the pressing piece abuts against the second filling bodies; the cover body is arranged on the outer side of the movable rod in a sleeving manner and covers the upper part and the outer side of the pressing piece; and the auxiliary positioning assembly is arranged between the cover body and the pressing piece, and the bottom end of the auxiliary positioning assembly abuts against the second filling body on the uppermost layer. By fully adjusting the connection relation among all the parts, the filling body can be fully utilized, and then the service life of equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of high-performance sealing of valves, and in particular to a multi-layer sealing packing gland structure and a use method thereof. Background Art

[0002] The existing pressure seat and the valve stem have multiple frictions, resulting in gaps that will leak oil or gas, so filling materials are usually used between the pressure seat and the valve stem. The gland packing seal is widely used in the design of shaft seals of transmission equipment and valve shaft seals. It uses axial force to compress the soft packing in the sealing chamber so that the packing generates lateral pressure (radial pressure) to seal the fluid and meet the sealing requirements. The sealing structure of the valve gland packing generally includes packing, packing gland and gland locking nut. Tightening the gland locking nut makes the packing gland press on the packing, and the packing presses the valve stem to generate lateral force to seal the valve stem. After the packing is used for a long time, such a single-channel seal is easily affected by factors such as wear, erosion, aging, and temperature, and gradually loses its compactness and causes leakage, causing the seal to fail and affecting the service life of the valve. The existing valve body structure using filling materials often makes it difficult for the valve body to work before the filling materials are completely rubbed. At this time, the entire valve body needs to be removed and replaced. In this way, the replacement cost of the valve body is very high, and the filling materials will also cause waste if they are not used up. Therefore, it is necessary to improve and optimize this problem. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a multi-layer sealing packing gland structure.

[0004] The first aspect of the present invention discloses a multi-layer sealing packing gland structure, comprising: a movable rod;

[0005] A seat body is sleeved on the outer side of the movable rod, and a first receiving groove is provided on one side of the seat body connected to the movable rod. A plurality of first filling bodies are provided in the first receiving groove, and the longitudinal section of the first filling body is a trapezoid or a triangle;

[0006] A pressing piece is sleeved on the outer side of the movable rod and is located above the seat body. A second receiving groove is provided on one side of the pressing piece connected to the movable rod. A plurality of second filling bodies are provided in the second receiving groove. The longitudinal section of the second filling body is a trapezoid or a triangle. The bottom of the pressing piece abuts against the second filling body.

[0007] A cover body is sleeved on the outer side of the movable rod and covers the upper side and the outer side of the pressing piece;

[0008] The auxiliary positioning component is arranged between the cover body and the pressing piece, and the bottom end of the auxiliary positioning component is in contact with the second filling body of the uppermost layer.

[0009] In an optional embodiment, it further includes a shell, a fastener and a plugging piece, the bottom of the pressing piece includes a pressing ear, the shell is arranged between the pressing ear and the seat body, the base is provided with a through hole, the fastener penetrates and connects the pressing ear, the shell and the base in sequence and passes out from the through hole, and the fastener is located on one side of the through hole and is connected and fixed by the plugging piece.

[0010] In an optional embodiment, the auxiliary positioning assembly includes a second metal ring abutting the second filling body and an elastic support module located on the outside of the second metal ring, and the second metal ring is sleeved on the outside of the movable rod; screw holes are provided on the second metal ring and at the position of the cover body above the second metal ring, and the two are fixed by screws.

[0011] In an optional embodiment, the longitudinal sections of the first filling body and the second filling body are both isosceles trapezoids and / or isosceles triangles.

[0012] In an optional embodiment, a buffer groove is provided on the pressing member below the second accommodating groove, and the distance between the bottom surface of the buffer groove and the movable rod is 1 mm-4 mm.

[0013] In an optional embodiment, a buffer gasket is provided between the fastener and the pressing ear.

[0014] In an optional embodiment, the elastic support module includes a top block and an elastic member, the top block abuts against the outer side of the metal ring, and one side of the elastic member is connected to the inner wall of the side circumference of the cover body and the other side is connected to the top block.

[0015] In an optional embodiment, an adhesive sheet is provided on the inner side of the first receiving groove, and the first filling body is fixed in the first receiving groove by the adhesive sheet.

[0016] In an optional embodiment, first metal rings are provided at both upper and lower ends of the inner side of the first containing groove, and the first metal rings abut against the first filling body.

[0017] A second aspect of the present invention discloses a method for using a multi-layer sealing packing gland structure, comprising the following steps:

[0018] S1: The movable rod is sleeved on the inner side of the base, and the side of the base connected to the movable rod is a first receiving groove, and a plurality of first filling bodies are filled into the first receiving groove;

[0019] S2: A pressing piece is installed on the upper part of the seat body, and the pressing piece is sleeved on the outer side of the movable rod. A second receiving groove is provided on the side where the pressing piece is connected to the movable rod, and a plurality of second filling bodies are filled into the second receiving groove;

[0020] S3: A cover body is installed above the pressing member, the cover body is sleeved on the outer side of the movable rod, and an auxiliary positioning component is installed between the cover body and the pressing member. During installation, one end of the auxiliary positioning component abuts against the upper side of the second filling body, and the other end abuts against the lower side of the cover body;

[0021] S4: During operation, the movable rod performs longitudinal reciprocating motion along the base, the pressing piece and the inner side of the cover body, which generates friction loss with the first filling body and the second filling body. When the first filling body in the first containing groove is completely worn out, the bottom of the pressing piece presses the first filling body downward;

[0022] S5: When the second filling body in the second containing groove is completely worn out, adjusting the tightness of the cover body installed on the pressing member so that the auxiliary positioning assembly synchronously presses the second filling body downward;

[0023] S6: When the first filling body and the second filling body are worn out, the cover body, the auxiliary positioning member and the pressing member are disassembled in sequence, and the first filling body and the second filling body are replaced with new ones.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] When the present invention is installed, the movable rod is sleeved on the inner side of the base, and multiple first filling bodies are filled into the first accommodating groove. The longitudinal section of the first filling bodies is a trapezoid or a triangle, so that when the multiple first filling bodies are squeezed against each other, a pressure piece is sleeved and installed above the base, above the first filling bodies, and on the outer side of the movable rod. Multiple second filling bodies are arranged in the second accommodating groove. The longitudinal section of the second filling bodies is also a trapezoid or a triangle, and the bottom of the pressure piece abuts against the second filling bodies; then a cover body is connected to the outer side of the movable rod, and the cover body is arranged above and outside the pressure piece. An auxiliary positioning component is arranged between the cover body and the pressure piece, and the bottom end of the component abuts against the second filling body on the uppermost layer. Therefore, when the cover body is fixedly installed on the movable rod, the auxiliary positioning assembly is tightly abutted against the second filling body. At the same time, the bottom of the pressure piece is also abutted against the first filling body. The pressure piece and the seat body cooperate to make the first filling body tightly fit the outer side of the movable rod. When the movable rod reciprocates up and down, friction is generated between the movable rod and the first filling body. In the process of wear of the first filling body, the pressure piece will also synchronously squeeze the first filling body downward. Since the longitudinal section of the first filling body is a trapezoid or a triangle, the extrusion surface between the two adjacent first filling bodies is increased, which can further increase the mutual force between the two, so that they can rub more fully. Under this friction, the phenomenon of oil leakage and gas leakage can also be better prevented. When the first filling body is mostly worn, the second filling body located on the inner side of the pressure piece can begin to wear. When the second filling body is completely worn, adjust the tightness of the cover body installed on the top of the pressure piece so that the auxiliary positioning assembly synchronously squeezes the second filling body downward. When the first filling body and the second filling body are both worn out, remove the cover body, the auxiliary positioning piece and the pressure piece in turn, and replace them with new first filling bodies and put them into use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure markings: 1-movable rod, 2-seat body, 3-first filling body, 4-pressing piece, 5-pressing ear, 6-second filling body, 7-cover body, 8-auxiliary positioning assembly, 9-second metal ring, 10-elastic support module, 11-top block, 12-elastic piece, 13-screw, 14-housing, 15-fastener, 16-blocking piece, 17-buffer groove, 18-buffer gasket, 19-first metal ring.

[0028] Figure 1 It is a structural schematic diagram of a multi-layer sealing packing gland structure of the present invention;

[0029] Figure 2 for Figure 1 A is an enlarged schematic diagram;

[0030] Figure 3 The present invention is a flowchart of a method for using a multi-layer sealing packing gland structure. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0032] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0033] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0034] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0035] See also Figure 1-2 , a first aspect of the embodiment of the present invention discloses a multi-layer sealing packing gland structure, comprising: a movable rod 1;

[0036] A seat body 2 is sleeved on the outer side of the movable rod 1. A first receiving groove is provided on one side of the seat body 2 connected to the movable rod 1. A plurality of first filling bodies 3 are provided in the first receiving groove. The longitudinal section of the first filling body 3 is a trapezoid or a triangle.

[0037] A pressing piece 4 is sleeved on the outer side of the movable rod 1 and is located above the seat body 2. A second receiving groove is provided on the side where the pressing piece 4 is connected to the movable rod 1. A plurality of second filling bodies 6 are provided in the second receiving groove. The longitudinal section of the second filling body 6 is a trapezoid or a triangle. The bottom of the pressing piece 4 abuts against the second filling body 6.

[0038] A cover body 7 is sleeved on the outer side of the movable rod 1 and covers the upper side and the outer side of the pressing member 4;

[0039] The auxiliary positioning component 8 is disposed between the cover body 7 and the pressing member 4 , and the bottom end of the auxiliary positioning component 8 abuts against the second filling body 6 of the uppermost layer.

[0040] Specifically, during installation, the movable rod 1 is sleeved on the inner side of the base, and a plurality of first filling bodies 3 are filled into the first accommodating groove. The longitudinal section of the first filling body 3 is a trapezoid or a triangle, so that when the plurality of first filling bodies 3 are squeezed against each other, a pressing piece 4 is sleeved and installed above the base, above the first filling body 3, and on the outer side of the movable rod 1. A plurality of second filling bodies 6 are arranged in the second accommodating groove. The longitudinal section of the second filling body 6 is also a trapezoid or a triangle, and the bottom of the pressing piece 4 abuts against the second filling body 6; then a cover body 7 is connected to the outer side of the movable rod 1, and the cover body 7 is arranged on the top and outside of the pressing piece 4. An auxiliary positioning component 8 is provided between the cover body 7 and the pressing piece 4, and the bottom end of the component abuts against the second filling body 6 of the top layer. Therefore, when the cover body 7 is fixedly installed on the movable rod 1, the auxiliary positioning assembly 8 is tightly abutted against the second filling body 6. At the same time, the bottom of the pressing piece 4 is also abutted against the first filling body 3. The pressing piece 4 and the seat body 2 cooperate to make the first filling body 3 fit tightly against the outer side of the movable rod 1. When the movable rod 1 reciprocates up and down, friction is generated between the movable rod 1 and the first filling body 3. During the wear of the first filling body 3, the pressing piece 4 will also synchronously squeeze the first filling body 3 downward. Since the longitudinal section of the first filling body 3 is a trapezoid or a triangle, the extrusion surface between the two adjacent first filling bodies 3 is increased, and the movable rod 1 can be moved back and forth. The mutual force between the two is further improved so that the friction can be more sufficient, and under this friction, the oil leakage and gas leakage can be better prevented; when the first filling body 3 is mostly worn, the second filling body 6 located on the inner side of the pressing piece 4 can begin to wear. When the second filling body 6 is completely worn, adjust the tightness of the cover body 7 installed on the top of the pressing piece 4 so that the auxiliary positioning assembly 8 can simultaneously squeeze the second filling body 6 downward; when the first filling body 3 and the second filling body 6 are both completely worn, remove the cover body 7, the auxiliary positioning piece and the pressing piece 4 in turn, and replace them with new first filling body 3 and second filling body 6 for use.

[0041] This solution can fully utilize the filling body and extend the service life of the valve body.

[0042] In an optional embodiment, it further includes a shell 14, a fastener 15 and a plug 16, the bottom of the pressing piece 4 includes a pressing ear 5, the shell 14 is arranged between the pressing ear 5 and the seat body 2, and a through hole is provided on the base, the fastener 15 passes through the pressing ear 5, the shell 14 and the base in sequence and passes out from the through hole, and the fastener 15 is located on one side of the through hole and is connected and fixed by the plug 16.

[0043] Specifically, the fastener 15 can be a screw 13, the plug 16 is a supplementary nut, and the seat body 2 is provided with a supplementary nut below the fastener 15. When the first filling body 3 is worn, its original space becomes larger. At this time, the connection between the plug 16 and the fastener 15 can be reinforced to press the pressing piece 4 downward, so that the bottom of the reinforced pressing piece 4 abuts against the position of the second filling body 6. Therefore, this structure can be used for emergency repairs.

[0044] In an optional embodiment, the auxiliary positioning component 8 includes a second metal ring 9 abutting against the second filling body 6 and an elastic support module 10 located on the outside of the second metal ring 9, and the second metal ring 9 is sleeved on the outside of the movable rod 1; screw holes are provided on the second metal ring 9 and at the position of the cover body 7 above the second metal ring 9, and the two are connected and fixed by screws 13.

[0045] Specifically, when the second filling body 6 is worn out, its original accommodation space becomes larger. The cover body 7 is reinforced and connected to the second metal ring 9 by screws 13, which can further improve the pressure of the second metal ring 9 on the second filling body 6, so that it can continue to contact and work with the movable rod 1. Therefore, this structure can also be used in emergency repair situations.

[0046] In an optional embodiment, the longitudinal sections of the first filling body 3 and the second filling body 6 are both isosceles trapezoids and / or isosceles triangles. Specifically, the first filling body 3 and the second filling body 6 of the same size and shape facilitate material replenishment and replacement in subsequent valve body maintenance and repair work.

[0047] In an optional embodiment, a buffer groove 17 is provided on the pressing member 4 below the second receiving groove, and the distance between the bottom surface of the buffer groove 17 and the movable rod 1 is 1mm-4mm. Specifically, the buffer groove 17 is used to receive a small amount of abrasive material of the second filling body 6 that falls from above.

[0048] In an optional embodiment, a buffer gasket 18 is provided between the fastener 15 and the pressing ear 5. When the pressing ear 5 is connected and fixed to the base, the buffer gasket 18 can be used to buffer the connection relationship between the fastener 15 installed on the pressing piece 4, thereby reducing the overall vibration of the base and the pressing piece 4 when the movable rod 1 performs reciprocating motion.

[0049] In an optional embodiment, the elastic support module includes a top block 11 and an elastic member 12, wherein the top block 11 abuts against the outer side of the metal ring, and one side of the elastic member 12 is connected to the inner wall of the side periphery of the cover body 7, and the other side is connected to the top block 11. Specifically, the elastic support module assembly is used to elastically support the connection between the second metal ring 9 and the screw 13, so as to facilitate their installation; the elastic member 12 is used to provide a small amount of sufficient movement space when the cover body 7 is installed on the pressing member 4, so as to improve the convenience of its installation.

[0050] In an optional embodiment, an adhesive sheet is provided on the inner side of the first receiving groove, and the first filling body 3 is fixed in the first receiving groove by the adhesive sheet. Specifically, the adhesive sheet can be used to fix the first filling body 3 in the first receiving groove, so that the first filling body 3 can be installed on the base and then on the movable rod 1 to prevent the first filling body 3 from falling during the installation process.

[0051] In an optional embodiment, first metal rings 19 are provided at both upper and lower ends of the inner side of the first containing groove, and the first metal ring 19 abuts against the first filling body 3. The first metal ring 19 is used to strengthen the squeezing of the first filling body 3 so that the first metal rings 19 interact with each other in time.

[0052] The present invention adjusts the connection relationship between the fastener 15 and the blocking member 16 so that the pressing member 4 can more fully squeeze the first filling body 3 so that it can continue to contact and work with the movable rod 1, and adjusts the screws 13 located on the cover body 7 and the second metal ring 9 to more fully squeeze the second filling body 6 so that it can continue to contact and work with the movable rod 1, so as to realize the use of the emergency maintenance valve body; and the longitudinal sections of the first filling body 3 and the second filling body 6 are both isosceles trapezoids and / or isosceles triangles to increase the contact area between the filling bodies, thereby fully utilizing the materials of the first filling body 3 and the second filling body 6 and thoroughly utilizing resources. Therefore, the service life of the valve body can also be extended in this way.

[0053] See also Figure 3 The second aspect of the embodiment of the present invention discloses a method for using a multi-layer sealing packing gland structure, comprising the following steps:

[0054] S1: The movable rod 1 is sleeved on the inner side of the base, and the side of the base connected to the movable rod 1 is a first receiving groove, and a plurality of first filling bodies 3 are filled into the first receiving groove;

[0055] S2: A pressing piece 4 is installed on the top of the seat body 2, and the pressing piece 4 is sleeved on the outside of the movable rod 1. A second receiving groove is provided on the side where the pressing piece 4 is connected to the movable rod 1, and a plurality of second filling bodies 6 are filled into the second receiving groove;

[0056] S3: A cover body 7 is installed above the pressing member 4, and the cover body 7 is sleeved on the outer side of the movable rod 1, and an auxiliary positioning component 8 is installed between the cover body 7 and the pressing member 4. During installation, one end of the auxiliary positioning component 8 abuts against the upper side of the second filling body 6, and the other end abuts against the lower side of the cover body 7;

[0057] S4: During operation, the movable rod 1 performs longitudinal reciprocating motion along the base, the pressing piece 4 and the inner side of the cover body 7, and generates friction loss with the first filling body 3 and the second filling body 6. When the first filling body 3 in the first receiving groove is worn out, the bottom of the pressing piece 4 presses the first filling body 3 downward;

[0058] S5: When the second filling body 6 in the second containing groove is completely worn, the tightness of the cover body 7 installed on the pressing member 4 is adjusted so that the auxiliary positioning assembly 8 simultaneously presses the second filling body 6 downward;

[0059] S6: When the first filling body 3 and the second filling body 6 are worn out, the cover body 7, the auxiliary positioning member and the pressing member 4 are disassembled in sequence, and the first filling body 3 and the second filling body 6 are replaced with new ones.

[0060] In this method, the longitudinal section of the first filling body 3 is a trapezoid or a triangle, and the extrusion surface between two adjacent first filling bodies 3 is enlarged, which can further improve the mutual force between the two, so that they can rub more fully; when the first filling body 3 is mostly worn, the second filling body 6 located inside the pressing piece 4 can begin to wear, and when the second filling body 6 is completely worn, the tightness of the cover body 7 installed on the pressing piece 4 is adjusted, so that the auxiliary positioning component 8 synchronously squeezes the second filling body 6 downward; when the first filling body 3 and the second filling body 6 are completely worn, the cover body 7, the auxiliary positioning piece and the pressing piece 4 are disassembled in turn, and the new first filling body 3 and the second filling body 6 can be replaced and put into use. Therefore, the service life of the valve body can also be extended through this solution.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-layer sealing packing gland structure, characterized in that: include: Active rod (1); A seat body (2) is sleeved on the outer side of the movable rod (1); a first receiving groove is provided on one side of the seat body (2) connected to the movable rod (1); a plurality of first filling bodies (3) are provided in the first receiving groove; and a longitudinal section of the first filling body (3) is a trapezoid or a triangle; A pressing piece (4) is sleeved on the outer side of the movable rod (1) and is located above the seat body (2). A second receiving groove is provided on the side of the pressing piece (4) connected to the movable rod (1). A plurality of second filling bodies (6) are provided in the second receiving groove. The longitudinal section of the second filling body (6) is a trapezoid or a triangle. The bottom of the pressing piece (4) abuts against the second filling body (6). A cover body (7) is sleeved on the outer side of the movable rod (1) and covers the upper side and the outer side of the pressing piece (4); An auxiliary positioning component (8) is arranged between the cover body (7) and the pressing piece (4), and the bottom end of the auxiliary positioning component (8) is in contact with the second filling body (6) at the top layer.

2. A multi-layer sealing packing gland structure according to claim 1, characterized in that: It also includes a shell (14), a fastener (15) and a plug (16); the bottom of the pressing piece (4) includes a pressing ear (5); the shell (14) is arranged between the pressing ear (5) and the base (2); a through hole is provided on the base; the fastener (15) sequentially penetrates and connects the pressing ear (5), the shell (14) and the base and passes through the through hole; the fastener (15) is located on one side of the through hole and is connected and fixed by the plug (16).

3. A multi-layer sealing packing gland structure according to claim 1, characterized in that: The auxiliary positioning component (8) comprises a second metal ring (9) abutting against the second filling body (6) and an elastic support module (10) located on the outside of the second metal ring (9), and the second metal ring (9) is sleeved on the outside of the movable rod (1); screw holes are provided on the second metal ring (9) and at a position of the cover body (7) above the second metal ring (9), and the two are connected and fixed by screws (13).

4. A multi-layer sealing packing gland structure according to claim 1, characterized in that: The longitudinal sections of the first filling body (3) and the second filling body (6) are both isosceles trapezoids and / or isosceles triangles.

5. The multi-layer sealing packing gland structure according to claim 1, characterized in that: A buffer groove (17) is provided on the pressing piece (4) below the second receiving groove, and the distance between the bottom surface of the buffer groove (17) and the movable rod (1) is 1 mm-4 mm.

6. A multi-layer sealing packing gland structure according to claim 2, characterized in that: A buffer gasket (18) is provided between the fastener (15) and the pressing ear (5).

7. A multi-layer sealing packing gland structure according to claim 3, characterized in that: The elastic support module comprises a top block (11) and an elastic member (12), wherein the top block (11) abuts against the outer side of the metal ring, and the elastic member (12) is connected to the inner wall of the side circumference of the cover body (7) on one side and connected to the top block (11) on the other side.

8. The multi-layer sealing packing gland structure according to claim 1, characterized in that: An adhesive sheet is provided on the inner side of the first containing groove, and the first filling body (3) is fixed in the first containing groove by the adhesive sheet.

9. The multi-layer sealing packing gland structure according to claim 1, characterized in that: First metal rings (19) are provided at both upper and lower ends of the inner side of the first containing groove, and the first metal ring (19) abuts against the first filling body (3).

10. A method for using a multi-layer sealing packing gland structure, characterized in that: The following steps are involved: S1: The movable rod (1) is sleeved on the inner side of the base, and the side of the base connected to the movable rod (1) is a first receiving groove, and a plurality of first filling bodies (3) are filled into the first receiving groove; S2: A pressing piece (4) is installed above the seat body (2), and the pressing piece (4) is sleeved on the outer side of the movable rod (1). A second receiving groove is provided on the side where the pressing piece (4) is connected to the movable rod (1), and a plurality of second filling bodies (6) are filled into the second receiving groove; S3: A cover body (7) is installed above the pressing member (4), the cover body (7) is sleeved on the outer side of the movable rod (1), and an auxiliary positioning component (8) is installed between the cover body (7) and the pressing member (4). During installation, one end of the auxiliary positioning component (8) abuts against the upper side of the second filling body (6), and the other end abuts against the lower side of the cover body (7); S4: When in operation, the movable rod (1) performs longitudinal reciprocating motion along the base, the pressing piece (4) and the inner side of the cover body (7), generating friction loss with the first filling body (3) and the second filling body (6). When the first filling body (3) in the first containing groove is completely worn out, the bottom of the pressing piece (4) presses the first filling body (3) downward; S5: When the second filling body (6) in the second containing groove is completely worn, the tightness of the cover body (7) installed on the top of the pressing piece (4) is adjusted so that the auxiliary positioning assembly (8) simultaneously presses the second filling body (6) downward; S6: When the first filling body (3) and the second filling body (6) are worn out, the cover body (7), the auxiliary positioning member and the pressing member (4) are disassembled in sequence, and the first filling body (3) and the second filling body (6) are replaced with new ones.

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