Gland packing and method of manufacturing gland packing

Abstract

To provide a gland packing capable of suppressing peeling of a laminate member, and a method of manufacturing the gland packing.SOLUTION: The gland packing includes: an annular packing main body formed by spirally winding a tape material; and a laminate member joined to an end portion of at least one side of the packing main body in an axial direction and formed of an annular sheet material; wherein the laminate member has a cutout groove formed on at least one side of an inner peripheral side and an outer peripheral side of the laminate member and opening on a peripheral surface on the one side, and the packing main body has an engagement protrusion protruding toward the one side in the axial direction and engaging with the cutout groove.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a gland packing and a method for manufacturing the gland packing. [Background technology]

[0002] Conventionally, gland packings have been known as a sealing structure used in shaft sealing portions of fluid equipment such as valves or pumps (see, for example, Patent Document 1). As shown in Fig. 12, a plurality of conventional gland packings 110, 111 are fitted onto the outside of a stem (shaft) 131 and installed inside a stuffing box 132. The gland packings 110, 111 are compressed in the axial direction by a packing gland 133 fitted onto the atmospheric side of the stuffing box 132, thereby coming into close contact with the outer peripheral surface of the stem 131 and the inner peripheral surface of the stuffing box 132, thereby sealing the gap between them.

[0003] Of the multiple gland packings 110, 111, the gland packing 110, excluding both axial ends, is made of a compression-molded body made of expanded graphite, which functions as a primary seal. The gland packing 110 includes a ring-shaped packing body 121 made of spirally wound expanded graphite tape material, and laminate members 122, 123 made of ring-shaped expanded graphite sheet material provided on both axial sides of the packing body 121.

[0004] In the illustrated example, two laminate members 122, 123 are stacked on each axial side of the packing body 121. The laminate members 122, 123 have the function of preventing the fluid in the fluid equipment from permeating into the packing body 121 and preventing the fluid that has permeated into the packing body 121 from leaking out of the gland packing 110. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Re-tabled publication 2016 / 163220 Summary of the Invention [Problem to be solved by the invention]

[0006] In the gland packing 110, if an external force that rotates the laminate members 122, 123 in the circumferential direction acts on the gland packing 110 during handling after molding, the laminate members 122, 123 are likely to peel off from the packing body 121. If the gland packing 110 is used in a state in which the laminate members 122, 123 have peeled off, the functions of the laminate members 122, 123 may be impaired, and the sealing performance of the gland packing 110 may be reduced.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide a gland packing that can prevent peeling of a laminate member, and a method for manufacturing the gland packing. [Means for solving the problem]

[0008] (1) The gland packing of the present disclosure comprises a circular packing body formed by spirally wound tape material, and a laminate member made of a circular sheet material and joined to at least one axial end of the packing body, wherein the laminate member has a notch groove formed on at least one of the inner and outer circumferential sides of the laminate member and opening on the peripheral surface of that side, and the packing body has an engaging protrusion that protrudes on the axial side and engages with the notch groove.

[0009] According to the gland packing of the present disclosure, the engagement protrusions of the packing body are engaged with the notched grooves formed in the laminate member, which prevents the laminate member from rotating in the circumferential direction relative to the packing body. This prevents the laminate member from peeling off from the packing body, thereby preventing a deterioration in the sealing performance of the gland packing.

[0010] (2) In the gland packing of (1) above, it is preferable that the inner diameter of the laminate member is the same as the inner diameter of the packing body, and the notched groove is formed on the outer periphery of the laminate member. In this case, the inner periphery of the packing body is covered with the laminate member. The engaging protrusions that engage with the notched grooves of the laminate member are formed on the outer periphery of the packing body. Therefore, when the gland packing is impregnated with lubricant, the lubricant is more likely to penetrate the engaging protrusions on the outer periphery than on the inner periphery of the packing body, resulting in more lubricant being impregnated on the outer periphery of the packing body than on the inner periphery. As a result, when the mating material slides against the inner periphery of the gland packing and the lubricant is reduced on the inner periphery of the packing body, lubricant can be supplied from the outer periphery of the packing body to the inner periphery. As a result, the sliding durability of the gland packing can be improved.

[0011] (3) In the gland packing of (1) or (2), it is preferable that the laminate members are joined to both axial ends of the packing body, and each laminate member has the notched groove. In this case, the laminate members joined to the ends on both axial sides of the packing body can be prevented from peeling off from the packing body.

[0012] (4) From another perspective, the manufacturing method of the gland packing of the present disclosure includes, in this order, a step of forming a notch groove that opens on the circumferential surface of at least one of the inner and outer circumferential sides of an annular laminate member made of a sheet material, and a step of overlapping the laminate member on at least one axial end of an annular packing body made of spirally wound tape material, compressing the packing body and the laminate member in the axial direction to join the laminate member to the packing body and extruding a portion of the axial end of the packing body into the notch groove to form an engaging protrusion that engages with the notch groove.

[0013] According to the manufacturing method of the gland packing of the present disclosure, the engaging protrusions of the packing body engage with the notched grooves formed in the laminate member, thereby preventing the laminate member from rotating in the circumferential direction relative to the packing body. This prevents the laminate member from peeling off from the packing body. As a result, deterioration of the sealing performance of the gland packing can be prevented. Furthermore, when the packing body and the laminate member are compressed in the axial direction to join the laminate member to the packing body, the engaging protrusions of the packing body are also formed. Therefore, a separate process of forming the engaging protrusions on the packing body is not required, and the gland packing can be easily manufactured. [Effects of the Invention]

[0014] According to the present disclosure, peeling of the laminated member of the gland packing can be suppressed. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view showing a state in which a seal structure including a gland packing according to a first embodiment is used. [Figure 2] FIG. 2 is an enlarged cross-sectional view showing the gland packing of FIG. 1. [Figure 3] FIG. 2 is a plan view of the gland packing of FIG. 1 as viewed from the axial direction. [Figure 4] FIG. 4 is an explanatory diagram of a second step in the method for manufacturing the gland packing. [Figure 5] FIG. 4 is an explanatory diagram of a second step in the method for manufacturing the gland packing. [Figure 6] FIG. [Figure 7] FIG. 6 is an enlarged cross-sectional view showing a gland packing according to a second embodiment. [Figure 8] FIG. 8 is a plan view of the gland packing of FIG. 7 as viewed from the axial direction. [Figure 9] FIG. 11 is a plan view of the gland packing according to the third embodiment, as viewed from the axial direction. [Figure 10]FIG. 10 is a plan view of the gland packing according to the fourth embodiment, as viewed from the axial direction. [Figure 11] FIG. 11 is a plan view of the gland packing according to the fifth embodiment, as viewed from the axial direction. [Figure 12] FIG. 10 is a cross-sectional view showing a state in which a conventional gland packing is used. DETAILED DESCRIPTION OF THE INVENTION

[0016] Next, preferred embodiments of the present disclosure will be described with reference to the accompanying drawings. [First embodiment] <Overall structure> 1 is a cross-sectional view showing a seal structure equipped with a gland packing according to a first embodiment in use. The seal structure 1 of this embodiment is attached to a stuffing box 31 provided in a fluid device such as a pump. The seal structure 1 is used to prevent fluid in the fluid device from leaking to the outside from between the stuffing box 31 and a stem (shaft) 32 that penetrates it.

[0017] The stem 32 is rotatable around the axis C and is reciprocatingly movable in a direction along the axis C. Hereinafter, in this disclosure, the direction along the axis C will be referred to as the "axial direction." For convenience, the upper side (one axial side) of FIG. 1 will be referred to as the axial upper side, and the lower side (the other axial side) of FIG. 1 will be referred to as the axial lower side. A direction perpendicular to the axis C will be referred to as the "radial direction." A direction around the axis C will be referred to as the "circumferential direction." Note that, although the stem 32 in this embodiment is arranged so that its axis C is in the vertical direction, it may also be arranged so that the axis C is in the horizontal direction.

[0018] The stuffing box 31 is formed with a cylindrical storage recess (cylindrical hole) 33 that is open on the axially upper side (atmosphere side) and has a bottom surface 33a on the axially lower side (machine interior side). The seal structure 1 is mounted inside the storage recess 33 of the stuffing box 31 through the opening on the axially upper side of the storage recess 33. A hole 34 through which the stem 32 passes is formed in the center of the bottom surface 33a of the storage recess 33.

[0019] A pressing member 35 is attached to the axially upper side of the stuffing box 31. The pressing member 35 has a cylindrical pressing main body portion 35a that is inserted into the storage recess 33, and a flange portion 35b that extends radially outward from the axially upper end of the pressing main body portion 35a. The flange portion 35b is attached to the stuffing box 31 with bolts 36 and nuts 37.

[0020] The axially lower tip surface of the pressing body 35a abuts against the seal structure 1 mounted in the storage recess 33. When the nut 37 is tightened onto the bolt 36 fixed to the stuffing box 31, the seal structure 1 is compressed in the axial direction between the bottom surface 33a of the storage recess 33 and the tip surface (lower end surface) of the pressing body 35a.

[0021] The seal structure 1 includes a plurality of (four in FIG. 1 ) first gland packings (gland packings) 2 and a pair of second gland packings 3. Both the first gland packings 2 and the second gland packings 3 are formed in an annular shape. The pair of second gland packings 3 are arranged at both axial ends of the storage recess 33. The first gland packings 2 are arranged side by side in the axial direction between the pair of second gland packings 3.

[0022] When the seal structure 1 is compressed in the axial direction by the pressing member 35 as described above, the outer peripheral surface 2a of the first gland packing 2 comes into close contact with the inner peripheral surface 33b of the storage recess 33, and the inner peripheral surface 2b of the first gland packing 2 comes into close contact with the outer peripheral surface 32a of the stem 32. This creates a seal between the stuffing box 31 and the stem 32.

[0023] The second gland packing 3 is made of braided packing having higher mechanical strength than the first gland packing 2. Specifically, the second gland packing 3 is made by braiding yarns made of carbon fiber or expanded graphite. By increasing its own mechanical strength, the second gland packing 3 is prevented from protruding into and becoming caught in the gap between the stuffing box 31 and the stem 32, or in the gap between the stuffing box 31 and the stem 32 and the pressing member 35.

[0024] <First gland packing> The first gland packing 2 has a packing body 10 and a laminate member 20. The packing body 10 is formed in an annular shape from expanded graphite. The packing body 10 is configured by spirally winding an expanded graphite tape material. The cross section of the packing body 10 is formed in a substantially rectangular shape.

[0025] 2 is an enlarged cross-sectional view showing the first gland packing 2. The packing body 10 of the first gland packing 2 has an annular base portion 11 and a bulging portion 12. The axial thickness of the base portion 11 is greater than the axial thickness of the laminate member 20. The bulging portion 12 is formed on the outer periphery of the base portion 11 so as to bulge in the axial direction.

[0026] In this embodiment, the bulging portions 12 are formed so as to bulge on both axial sides on the outer periphery of the base portion 11. Each bulging portion 12 is formed in an annular shape over the entire circumferential direction of the base portion 11. The axial thickness of each bulging portion 12 is the same as the axial thickness of the laminate member 20. Each bulging portion 12 is formed during compression in the second step described below.

[0027] 1 and 2, the laminate member 20 of the first gland packing 2 is made of an annular sheet material. Specifically, the laminate member 20 is formed by punching an expanded graphite sheet material into an annular shape by press working. The laminate members 20 of this embodiment are provided at both axial end portions of the packing body 10. One end face 20a of each laminate member 20 is joined to the end face 11a of the base portion 11 of the packing body 10.

[0028] The inner diameter D21 of each laminate member 20 is the same as the inner diameter D11 of the packing body 10. The outer diameter D22 of each laminate member 20 is smaller than the outer diameter D12 of the packing body 10. The inner peripheral surface of the bulge 12 abuts against the outer peripheral surface of each laminate member 20. The other end surface 20b of each laminate member 20 is flush with the tip surface 12a of the bulge 12.

[0029] The laminate member 20 has the function of preventing fluid in the fluid equipment from permeating into the packing body 10 and preventing fluid that has permeated into the packing body 10 from leaking out of the first gland packing 2. The laminate member 20 is loaded into a mold 50 (see FIG. 6) together with the packing body 10, and is joined to the packing body 10 by being compressed by a press machine. A detailed manufacturing method for the first gland packing 2 will be described later.

[0030] 3 is a plan view of the first gland packing 2 as viewed from the axial direction. Each laminate member 20 of the first gland packing 2 has a predetermined number (one in this embodiment) of notched grooves 21 formed on its outer periphery. The notched groove 21 is formed, for example, in a V-shape as viewed from the axial direction, and opens at the outer periphery of the laminate member 20. The notched groove 21 has a pair of inner side surfaces 21a on both sides in the circumferential direction. The angle formed by the pair of inner side surfaces 21a, i.e., the angle of the valley of the notched groove 21, is an acute angle.

[0031] The packing body 10 has engaging protrusions 13 that protrude axially from the base portion 11 and engage with the notched grooves 21 of the laminate member 20. In this embodiment, the engaging protrusions 13 are provided so as to protrude from the outer periphery of the base portion 11 on both axial sides, and are engaged with the notched grooves 21 of each laminate member 20. Each engaging protrusion 13 is provided at a predetermined location in the circumferential direction of the base portion 11, and is connected to the inner circumferential surface of the bulge portion 12.

[0032] Each engaging protrusion 13 is formed in a shape that matches the shape of the notched groove 21. In this embodiment, each engaging protrusion 13 is formed in an inverted V shape when viewed in the axial direction, tapering radially inward from the bulging portion 12. Each engaging protrusion 13 has a pair of outer surfaces 13a on both circumferential sides. The pair of outer surfaces 13a abut against the inner surfaces 21a of the notched groove 21, respectively. The tip surface 13b of each engaging protrusion 13 is flush with the tip surface 12a of the bulging portion 12 and the other end surface 20b of the laminate member 20. Each engaging protrusion 13 is molded together with the bulging portion 12 during compression in the second step described below.

[0033] <Manufacturing method of first gland packing> The first gland packing 2 is manufactured by compression molding in a mold 50 (see FIG. 6). The manufacturing method of the first gland packing 2 of this embodiment includes a first step of forming the notched grooves 21 in the laminate member 20 and a second step of joining the laminate members 20 to both axial sides of the packing body 10.

[0034] In the first step, the outer periphery of the laminate member 20 is punched out in a V shape by press working, thereby forming the notched groove 21 in the laminate member 20. Note that when the sheet material is punched out to form the annular laminate member 20, the outer periphery of the annular shape may also be punched out in a V shape at the same time, thereby forming the notched groove 21.

[0035] 4 and 5 are explanatory views of the second step. The second step is performed after the first step. In the second step, as shown in FIG. 5, laminate members 20 each having a notched groove 21 formed therein are concentrically stacked on both axial ends of the packing body 10, from the state shown in FIG. 4. In this case, the notched grooves 21 of the laminate member 20 stacked on the axially upper side of the packing body 10 and the notched grooves 21 of the laminate member 20 stacked on the axially lower side of the packing body 10 may be positioned at the same or different positions in the circumferential direction. At this point, the bulging portions 12 and the engaging protrusions 13 are not formed on both axial ends of the packing body 10.

[0036] Next, the packing body 10 and the pair of laminate members 20 stacked in the axial direction are loaded into a mold 50. FIG. 6 is a perspective view showing the mold 50. The mold 50 includes a lower mold portion 51 and an upper mold portion 52. The lower mold portion 51 has a cylindrical molding hole 51a that opens on its upper surface. The upper mold portion 52 is made of a cylindrical body and is sized to be inserted into the molding hole 51a of the lower mold portion 51.

[0037] The packing body 10 and the pair of laminate members 20, which are stacked in the axial direction, are loaded into the lower mold section 51, and the upper mold section 52 is inserted into the forming hole 51a of the lower mold section 51. Then, the upper mold section 52 is pressed from above by a press machine, whereby the packing body 10 and the pair of laminate members 20 are compressed in the axial direction. As a result, each laminate member 20 is bonded to the packing body 10. At the same time as this bonding, the outer peripheral end of the packing body 10 bulges out on both sides in the axial direction due to the axial compression, thereby forming annular bulging portions 12 as shown in FIG. 2.

[0038] Furthermore, due to the axial compression, a part of the base portion 11 of the packing body 10 is pushed into the notched grooves 21 of each laminate member 20, thereby forming engaging protrusions 13 on both axial sides of the packing body 10 as shown in Fig. 3. At this time, each engaging protrusion 13 is formed into a shape that matches the shape of the notched grooves 21. Therefore, each engaging protrusion 13 is in a state of being engaged with the notched grooves 21 at the time of forming.

[0039] The first gland packing 2 manufactured through the first and second steps is impregnated with a lubricant. During the impregnation, the inner periphery of the packing body 10 is covered with the laminate member 20, whereas the bulging portions 12 and engaging protrusions 13 formed on the outer periphery of the packing body 10 are exposed. Therefore, more lubricant is impregnated into the bulging portions 12 and engaging protrusions 13 on the outer periphery of the packing body 10 than into the inner periphery.

[0040] <Action and effect> According to the first gland packing 2 of this embodiment, the engaging protrusions 13 of the packing body 10 are engaged with the notched grooves 21 of the laminate members 20 joined to both axial ends of the packing body 10. This prevents the laminate members 20 from rotating in the circumferential direction relative to the packing body 10, thereby preventing the laminate members 20 from peeling off from the packing body 10. As a result, the sealing performance of the first gland packing 2 can be prevented from decreasing.

[0041] Since the inner diameter D21 of the laminate member 20 is the same as the inner diameter D11 of the packing body 10, the inner periphery of the packing body 10 is covered by the laminate member 20. Also, since the notched grooves 21 are formed on the outer periphery of the laminate member 20, the engaging protrusions 13 that engage with the notched grooves 21 are formed on the outer periphery of the packing body 10. Furthermore, the bulging portions 12 are formed on the outer periphery of the packing body 10. Therefore, when the first gland packing 2 is impregnated with a lubricant, the lubricant is more easily impregnated into the bulging portions 12 and the engaging protrusions 13 on the outer periphery than into the inner periphery of the packing body 10, and therefore more lubricant is impregnated into the outer periphery of the packing body 10 than into the inner periphery. As a result, when the outer peripheral surface 32a of the stem 32 slides against the inner peripheral surface 2b of the first gland packing 2 and the lubricant decreases on the inner peripheral side of the packing body 10, the lubricant can be supplied from the outer peripheral side to the inner peripheral side of the packing body 10. As a result, the sliding durability of the first gland packing 2 can be improved.

[0042] According to the manufacturing method of the first gland packing 2 of this embodiment, the engaging protrusions 13 of the packing body 10 are also formed when the packing body 10 and the laminate member 20 are compressed in the axial direction to join the laminate member 20 to the packing body 10. Therefore, a separate process of forming the engaging protrusions 13 on the packing body 10 is not required, and the first gland packing 2 can be manufactured easily.

[0043] The packing body 10 of the first embodiment may also have a bulge 12 on the inner peripheral side. Furthermore, the laminate member 20 of the first embodiment may also have a notched groove 21 on the inner peripheral side in addition to or instead of the notched groove 21 on the outer peripheral side. In this case, an engaging protrusion 13 may be provided on the inner peripheral side of the packing body 10.

[0044] [Second embodiment] FIG. 7 is an enlarged cross-sectional view showing a gland packing according to a second embodiment. FIG. 8 is a plan view of the gland packing of FIG. 7 as viewed from the axial direction. The gland packing (first gland packing 2) of this embodiment differs from the first embodiment in that a bulge 12 is formed on the inner circumferential side of the packing body 10. Specifically, the inner diameter D21 of each laminate member 20 of this embodiment is larger than the inner diameter D11 of the packing body 10. The outer diameter D22 of each laminate member 20 is the same as the outer diameter D12 of the packing body 10. The base portion 11 of the packing body 10 is formed with bulge portions 12 that bulge outward from the inner circumferential side to both sides in the axial direction. The outer circumferential surfaces of the bulge portions 12 abut against the inner circumferential surface of each laminate member 20.

[0045] The notched grooves 21 of each laminate member 20 open to the outer peripheral surface of the laminate member 20, which becomes the outer peripheral surface 2a of the first gland packing 2. The engaging protrusions 13 that engage with the notched grooves 21 are formed radially outward of the bulging portions 12 in the packing body 10. Therefore, the engaging protrusions 13 of this embodiment are not connected to the bulging portions 12. Since other configurations of this embodiment are the same as those of the first embodiment, the same reference numerals are used and their description will be omitted.

[0046] In the first gland packing 2 of this embodiment, the engaging protrusions 13 of the packing body 10 are engaged with the notched grooves 21 of the laminate members 20, so that the circumferential rotation of each laminate member 20 relative to the packing body 10 is suppressed. This prevents the laminate members 20 from peeling off from the packing body 10, and therefore prevents the sealing performance of the first gland packing 2 from deteriorating.

[0047] The packing body 10 of this embodiment does not have to have the bulge 12 on the inner peripheral side. Furthermore, the laminate member 20 of this embodiment may have a notch groove 21 on the inner peripheral side in addition to or instead of the notch groove 21 on the outer peripheral side. In this case, the engaging protrusion 13 may be provided also on the inner peripheral side of the packing body 10.

[0048] [Third embodiment] 9 is a plan view of a gland packing according to the third embodiment as viewed from the axial direction. The gland packing (first gland packing 2) of this embodiment differs from the first embodiment in that the laminate member 20 has a plurality of notched grooves 21. The laminate member 20 of this embodiment has eight notched grooves 21 formed on its outer periphery. The angle of the valley of each notched groove 21 is an obtuse angle. The space between adjacent notched grooves 21 in the circumferential direction of the laminate member 20 is formed into a trapezoidal shape as viewed from the axial direction. Since the other configurations of this embodiment are the same as those of the first embodiment, the same reference numerals are used and their description will be omitted.

[0049] In the first gland packing 2 of this embodiment, the engaging protrusions 13 of the packing body 10 are engaged with the notched grooves 21 of the laminate members 20, so that the circumferential rotation of each laminate member 20 relative to the packing body 10 is suppressed. This prevents the laminate members 20 from peeling off from the packing body 10, and therefore prevents the sealing performance of the first gland packing 2 from deteriorating.

[0050] Furthermore, when the first gland packing 2 is impregnated with lubricant, the lubricant is more likely to penetrate into the bulging portion 12 and the engaging protrusion 13 on the outer periphery side of the packing body 10 than into the inner periphery side of the packing body 10, so that more lubricant is impregnated on the outer periphery side of the packing body 10 than on the inner periphery side. As a result, when the outer periphery surface 32a of the stem 32 slides against the inner periphery surface 2b of the first gland packing 2 and the amount of lubricant decreases on the inner periphery side of the packing body 10, lubricant can be supplied from the outer periphery side to the inner periphery side of the packing body 10. As a result, the sliding durability of the first gland packing 2 can be improved.

[0051] The packing body 10 of this embodiment may have a bulging portion 12 on the inner peripheral side in addition to or instead of the bulging portion 12 on the outer peripheral side. Also, the laminate member 20 of this embodiment may have a notched groove 21 on the inner peripheral side in addition to or instead of the notched groove 21 on the outer peripheral side. In this case, the engaging protrusion 13 may be provided on the inner peripheral side of the packing body 10.

[0052] [Fourth embodiment] 10 is a plan view of a gland packing according to a fourth embodiment as viewed from the axial direction. The gland packing (first gland packing 2) of this embodiment is a modified example of the third embodiment, and differs from the third embodiment in that the packing body 10 does not have a bulge 12. Specifically, the inner diameter D21 of each laminate member 20 of this embodiment is the same as the inner diameter D11 of the packing body 10. The outer diameter D22 of each laminate member 20 is the same as the outer diameter D12 of the packing body 10. As a result, the packing body 10 does not have a bulge 12 on either its outer or inner circumference.

[0053] The space between adjacent notched grooves 21 in the circumferential direction of the laminate member 20 is formed in a triangular shape when viewed from the axial direction. Since the other configurations of this embodiment are the same as those of the third embodiment, the same reference numerals are used and the description thereof will be omitted.

[0054] In the first gland packing 2 of this embodiment, the engaging protrusions 13 of the packing body 10 are engaged with the notched grooves 21 of the laminate members 20, so that the circumferential rotation of each laminate member 20 relative to the packing body 10 is suppressed. This prevents the laminate members 20 from peeling off from the packing body 10, and therefore prevents the sealing performance of the first gland packing 2 from deteriorating.

[0055] Furthermore, when the first gland packing 2 is impregnated with lubricant, the lubricant is more likely to penetrate into the engaging protrusions 13 on the outer periphery side of the packing body 10 than into the inner periphery side, so that more lubricant is impregnated into the outer periphery side of the packing body 10 than into the inner periphery side. As a result, when the outer periphery surface 32a of the stem 32 slides against the inner periphery surface 2b of the first gland packing 2 and the amount of lubricant decreases on the inner periphery side of the packing body 10, lubricant can be supplied from the outer periphery side to the inner periphery side of the packing body 10. As a result, the sliding durability of the first gland packing 2 can be improved.

[0056] The packing body 10 of this embodiment may have a bulge 12 on at least one of the inner and outer peripheral sides. Furthermore, the laminate member 20 of this embodiment may have a notched groove 21 on the inner peripheral side in addition to or instead of the notched groove 21 on the outer peripheral side. In this case, the engaging protrusion 13 may be provided on the inner peripheral side of the packing body 10.

[0057] [Fifth embodiment] 11 is a plan view of a gland packing according to a fifth embodiment, as viewed from the axial direction. The gland packing (first gland packing 2) of this embodiment is a modification of the first embodiment, and differs from the first embodiment in that notched grooves 21 are formed on the inner circumferential side of the laminate member 20. Each laminate member 20 of this embodiment has a predetermined number (12 in this embodiment) of notched grooves 21 formed on its inner circumferential side. Each notched groove 21 opens on the inner circumferential surface of the laminate member 20, which becomes the inner circumferential surface 2b of the first gland packing 2. The space between adjacent notched grooves 21 in the circumferential direction of the laminate member 20 is formed in a triangular shape when viewed from the axial direction.

[0058] The engaging protrusions 13 that engage with the notched grooves 21 are formed on both axial sides of the inner periphery of the packing body 10, and the number of engaging protrusions 13 is the same as the number of notched grooves 21 in each laminate member 20. As a result, each engaging protrusion 13 is formed radially inward of the bulging portion 12 and is not connected to the bulging portion 12. Since other configurations of this embodiment are similar to those of the first embodiment, the same reference numerals are used and their description will be omitted.

[0059] In the first gland packing 2 of this embodiment, the engaging protrusions 13 of the packing body 10 are engaged with the notched grooves 21 of the laminate members 20, so that the circumferential rotation of each laminate member 20 relative to the packing body 10 is suppressed. This prevents the laminate members 20 from peeling off from the packing body 10, and therefore prevents the sealing performance of the first gland packing 2 from deteriorating.

[0060] The packing body 10 of this embodiment may have a bulging portion 12 on the inner peripheral side in addition to or instead of the bulging portion 12 on the outer peripheral side. Also, the laminate member 20 of this embodiment may have a notched groove 21 on the outer peripheral side in addition to or instead of the notched groove 21 on the inner peripheral side. In this case, the engaging protrusion 13 may be provided on the outer peripheral side of the packing body 10.

[0061] [others] In each of the above embodiments, the laminate member 20 is joined to both axial sides of the packing body 10, but it may also be joined only to the axial upper side or only to the axial lower side of the packing body 10. The shape of the notched groove 21 of the laminate member 20 may be a shape other than a V-shape. In that case, the engaging protrusion 13 of the packing body 10 may have a shape that matches the shape of the notched groove 21. Of the above multiple embodiments, at least a part of one embodiment may be combined with at least a part of another embodiment in any combination.

[0062] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above meaning, and is intended to include all modifications within the scope and meaning equivalent to the claims. [Explanation of symbols]

[0063] 2. First gland packing (gland packing) 10 Packing body 13 Engagement protrusion 20 Laminated materials 21 Notched groove D11 Inner diameter of packing body D21 Inner diameter of laminated member

Claims

1. a ring-shaped packing body formed by spirally winding a tape material; a laminate member made of an annular sheet material and joined to at least one axial end of the packing body, the laminating member has a notched groove formed on at least one of an inner peripheral side and an outer peripheral side of the laminating member, the notched groove opening on the peripheral surface of the one side; The gland packing has an engaging protrusion that protrudes toward one axial side and is engaged with the notched groove.

2. The inner diameter of the laminate member is the same as the inner diameter of the packing body, The gland packing according to claim 1 , wherein the notched groove is formed on an outer circumferential side of the laminate member.

3. The laminate members are joined to both axial end portions of the packing body, The gland packing according to claim 1 or 2, wherein each of the laminate members has the notched groove.

4. forming a notched groove on at least one of an inner circumferential side and an outer circumferential side of an annular laminate member made of a sheet material, the notched groove opening on the circumferential surface of the one side; a step of compressing the packing body and the laminate member in the axial direction while the laminate member is placed on at least one axial end of the annular packing body formed by spirally wound tape material, thereby joining the laminate member to the packing body, and a step of extruding a portion of the one axial end of the packing body into the cutout groove to form an engaging protrusion that engages with the cutout groove.

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