JP2016020711A - Seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure having a simple configuration and capable of holding seal characteristic.SOLUTION: This invention relates to a seal structure B having a plurality of annular V-shaped packings 31, 32 laminated in a laminating direction D. The V-shaped packings comprise the first V-shaped packing 31 having a recess part 31a at one surface in the laminated direction D and a projected part 31b at the other surface in the laminated direction D, and the second packing 32 arranged at the other side of the first V-shaped packing 31 in the laminated direction D and having a recess part 32a for receiving the projection part 31b of the first V-shaped packing 31. The second V-shaped packing 32 has a flat surface 32b forming the other surface in the laminated direction D and narrower than that of one surface and an inclined surface 32c arranged to connect the flat surface 32b with one surface and showing a specified inclination angle γ in respect to the laminated direction D.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seal structure including a V packing.

  As a seal structure provided with a V packing, for example, a seal structure provided in a reciprocating pump is known. In the reciprocating pump, the reciprocating member reciprocates in the cylinder portion formed in the manifold, so that the fluid is pumped in the pump chamber formed on the tip side in the cylinder portion. A high-pressure seal is provided between the cylinder part and the reciprocating member to prevent the high-pressure fluid in the pump chamber from leaking to the drive part side between the cylinder part and the reciprocating member. Yes.

  For example, in the reciprocating pump described in Patent Document 1, an annular high-pressure seal that is in fluid-tight sliding contact with the outer peripheral surface of the reciprocating member is provided in the cylinder portion. The high-pressure seal includes a plurality of annular V packings stacked in the axial direction of the reciprocating member, and is fixed by being pressed to the crankcase side by a communication pipe. As such a high-pressure seal, a structure in which an annular adapter is disposed on both sides of a plurality of stacked V packings is employed. Patent Document 2 describes a packing structure provided around the drive shaft of a rotating or reciprocating pump. Also in this structure, a plurality of annular V packings are provided, and these V packings are sandwiched between the upper adapter and the lower adapter.

JP 2010-53861 A Japanese Patent Publication No.54-33332

  In the conventional seal structure, for example, the structure shown in FIG. 4 is adopted. The seal structure 200 includes a male adapter 201, a plurality (three in the example of FIG. 4) V packing 202, and a female adapter 203 from the pump chamber side (left side in the figure). This seal structure 200 is provided between a cylinder member 204 and a plunger 205 which is a reciprocating member. Various materials can be applied to the V-packing 202, and examples thereof include rubber systems such as NBR (Nitrile Rubber) and synthetic resins. In the sealing structure 200, the sealing performance is maintained by pressing the front side (left side in the figure) of the V packing 202 with the male adapter 201 while holding the rear side (right side in the figure) of the V packing 202 with the female adapter 203. .

  In the above structure, the V packing 202 is made of an elastic body having a sealing property. The female adapter 203 that holds the V-packing 202 is made of metal so that it can withstand high pressure. In this case, for example, if the plunger 205 is made of ceramic, there is a possibility that the plunger 205 may be worn by the metal female adapter 203, and there is a drawback that the sealing property, that is, the pressure cannot be maintained. In order to compensate for this, it is conceivable to change the female adapter 203 to a resin having lubricity. However, the female adapter 203 made of resin has a drawback that it tends to be deformed by the influence of heat. When a high strength resin is used, a crack may occur from the V-shaped concave portion of the female adapter 203, resulting in a problem that the sealing property, that is, the pressure cannot be maintained.

  An object of this invention is to provide the sealing structure which can maintain sealing performance with a simple structure.

  The present invention is a seal structure (B) including a plurality of annular V packings stacked in a predetermined direction, and the V packing has a recess (31a) on one surface in the stacking direction (D) of the V packing. And a first V packing (31) having a convex portion (31b) on the other surface in the stacking direction (D) and the other side of the first V packing (31) in the stacking direction (D). A second V-packing (32) having a concave portion (32a) for receiving the convex portion (31b) of the first V-packing (31) on one surface in the stacking direction (D), The V packing (32) forms the other surface in the stacking direction (D), and is provided so as to connect the flat surface (32b) having a narrower width than the one surface, and the flat surface (32b) and the one surface. And an inclined surface (3) inclined at a constant inclination angle (γ) relative to the stacking direction (D) And c), the characterized in that it has a.

  According to this seal structure (B), the male adapter or the convex portion (31b) of the other first V packing (31) enters the concave portion (31a) of the first V packing (31) to form a lip shape. Is maintained, the sealing performance by the first V-packing (31) is maintained. Furthermore, in a state where the convex portion (31b) of the first V packing is received in the concave portion (32a) of the second V packing (32), the inclined surface (32c) of the second V packing (32) Press contact with the sealing surface. Also by the second V packing (32), the lip shape similar to that of the first V packing (31) is maintained, and the sealing performance is maintained. Moreover, since the second V-packing (32) has a flat surface (32b) on the other surface in the stacking direction (D), the second V-packing (32) has the same holding function as the female adapter (that is, the final The function of holding the first V-packing (31) of the step is exhibited. Since the second V packing (32) can be made of the same material as the first V packing (31), there is a problem when it is made of metal like a female adapter or made of high strength resin. Not likely to occur. As described above, the laminated structure of the V packing in which the first V packing (31) and the second V packing (32) are combined can maintain the sealing performance with a simple configuration.

  The sealing structure (B) is made of a resin that is disposed on the other side of the second V packing (32) in the stacking direction (D) and contacts the flat surface (32b) of the second V packing (32). The annular member (34) is provided. In this case, the annular member (34) serves as a backup, and leakage of the fluid to be sealed can be reliably prevented. Further, since the annular member (34) is made of resin, for example, even when the annular member (34) is in sliding contact with the reciprocating member or the rotating member, it is easy to prevent the reciprocating member from being worn.

  Said seal structure (B) is a seal structure (B) of the reciprocating pump (100) provided with the reciprocating member (8) reciprocating along a lamination direction (D), and V packing is reciprocating. The working fluid is prevented from leaking around the reciprocating member (8) in sliding contact with the member (8). In this case, the sealing performance can be maintained with a simple configuration with respect to the reciprocating member (8) of the reciprocating pump.

  According to the present invention, the sealing performance is maintained with a simple configuration.

It is a longitudinal section showing a reciprocating pump to which a seal structure concerning one embodiment of the present invention was applied. It is an enlarged view of the part provided with the seal structure of FIG. (A) is an expanded sectional view of the seal structure in FIG. 1, (b) is a sectional view of the first V packing, and (c) is a sectional view of the second V packing. It is sectional drawing which shows the conventional seal structure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  With reference to FIG. 1, the whole structure of the reciprocating pump (fluid machine) to which the seal structure of this embodiment was applied is demonstrated. As shown in FIG. 1, the reciprocating pump 100 includes a crankcase 1, a plate 2, a seal case 3, a cylinder pipe 4, and a manifold 5 connected in this order from the right side to the left side in the schematic drawing. A crankshaft 6 and a connecting rod 7 are arranged inside the crankcase 1. Inside the crankcase 1, the plate 2 and the cylinder pipe 4, a first plunger 8 a on the crankcase 1 side and a cylinder pipe 4 side are arranged. A reciprocating member 8 that is connected to the second plunger 8b is disposed. The end of the first plunger 8 a on the crankcase 1 side is connected to the crankshaft 6 via a connecting rod 7. The reciprocating member 8 reciprocates along the central axis A direction in the cylinder pipe 4 in accordance with the rotational drive of the crankshaft 6. The second plunger 8b can be manufactured using various materials, and is made of, for example, ceramic.

  The crankcase 1 is filled with lubricating oil from the oil filling port 9, and the reciprocating member 8 is slidably contacted with the reciprocating member 8 to prevent the lubricating oil in the crankcase 1 from leaking. An oil seal 10 is provided for this purpose. Lubricating oil in the crankcase 1 can be visually recognized by the oil gauge 11 and can be discharged by the drain plug 12 as necessary.

  The seal case 3 is disposed inside the plate 2 and the cylinder pipe 4 so as to surround the reciprocating member 8 across the plate 2 and the cylinder pipe 4. Inside the seal case 3, a low-pressure seal 3a that is in fluid-tight sliding contact with the reciprocating member 8 is disposed. The low-pressure seal 3a is an annular body including, for example, synthetic rubber.

  The manifold 5 has a small-diameter opening 5c toward the cylinder pipe 4 and a large-diameter opening 5d that is connected to the large-diameter opening 5d, and further uses a working liquid (working fluid) in the pump chamber 13. And a discharge port 5 b for discharging the liquid compressed in the pump chamber 13. The discharge port 5b is provided so as to communicate with the back side of the sheet, and does not appear in the drawing. Further, the manifold 5 accommodates a suction passage 15 for introducing the liquid from the suction port 5a into the pump chamber 13 and a discharge passage 16 for discharging the liquid compressed in the pump chamber 13 toward the discharge port 5b. The suction passage 15 is provided with a suction valve 21, and the discharge passage 16 is provided with a discharge valve 22.

  A communication pipe (cylinder member) 14 is inserted inside the cylinder pipe 4 and is pressed and fixed to the manifold 5 side via the plate 2 and the seal case 3. The manifold 5 side of the communication pipe 14 has a small-diameter portion 14b whose outer peripheral side is smaller in diameter than other portions, and this small-diameter portion 14b is inserted into and fitted into the small-diameter opening 5c of the manifold 5. . At this time, the step portion between the small diameter portion 14b of the communication pipe 14 and the large diameter portion 14c on the rear side thereof, and the step portion between the opening portion 5c and the opening portion 5d in the opening portion of the manifold 5 come into contact. The insertion depth of the communication pipe 14 is regulated.

  A cylindrical pump chamber 13 is formed on the distal end side inside the communication pipe 14 as a space where the distal end of the reciprocating member 8 reciprocates with the top dead center and the bottom dead center as limit points. The reciprocating member 8 is reciprocated in the left-right direction in FIG. 1 in the communication pipe 14, so that the pump chamber 13 is pressurized / depressurized by the reciprocating member 8.

  Specifically, when the reciprocating member 8 moves toward the crankshaft 6 (toward the bottom dead center), the pump chamber 13 is depressurized, and the suction valve 21 and the discharge valve 22 provided in the manifold 5 are respectively Open and closed, and the liquid to be used is sucked into the pump chamber 13 from the suction port 5a through the suction passage 15. On the other hand, when the reciprocating member 8 moves toward the opposite side of the crankshaft 6 (to the top dead center), the pump chamber 13 is pressurized, and the suction valve 21 and the discharge valve 22 are closed and opened, respectively. The liquid used in the chamber 13 is discharged through the discharge path 16 to the discharge port 5b. Thus, the pump chamber 13 is configured to perform a pumping action for sucking and discharging liquid.

  As shown in FIGS. 1 and 2, a diameter-enlarged portion 14 d that is larger than the pump chamber 13 is provided inside the communication pipe 14 on the crankcase 1 side (that is, the large-diameter portion 14 c). A high pressure seal 30 that is in fluid-tight sliding contact with the reciprocating member 8 is accommodated in the enlarged diameter portion 14d. That is, the seal structure B of the present embodiment includes a communication pipe 14, a high-pressure seal 30 that is disposed inside the communication pipe 14 and provided between the communication pipe 14 and the seal case 3, and is in sliding contact with the high-pressure seal 30. 2 plungers 8b (reciprocating member 8).

  The high pressure seal 30 is supplied from the pump chamber 13 to the crankcase 1 by the transfer of the used liquid between the second plunger 8b (reciprocating member 8) that reciprocates and the communication pipe 14 in cooperation with the low pressure seal 3a. Prevent leakage to the side. In other words, the high-pressure seal 30 and the low-pressure seal 3a for preventing leakage of the liquid used and the oil seal 10 for preventing leakage of the lubricating oil in the drive unit are in fluid-tight sliding contact with the reciprocating member 8. Further, they are arranged in this order from the pump chamber 13 side toward the crankshaft 6 side.

  Between the high-pressure seal 30 and the low-pressure seal 3a, there is a cooling channel 17 for cooling the reciprocating member 8 (second plunger 8b) by a part of the used liquid sucked through the communication path 18. Is provided. The high-pressure seal 30 and the low-pressure seal 3a prevent leakage of the liquid used in the cooling flow path 17 to the pump chamber 13 side and the crankcase 1 side. Note that the cooling channel 17 and the communication channel 18 side are in a lower pressure state than the pump chamber 13 by the high pressure seal 30, the low pressure seal 3 a, and the suction valve 21.

  The high-pressure seal 30 is configured so that the high-pressure fluid in the pump chamber 13 travels between the communication pipe 14 that is a cylinder member and the reciprocating member 8 (second plunger 8b) to the drive unit side (cooling channel 17 side). Prevent leakage. As shown in FIG. 2, the high-pressure seal 30 includes an annular first V-packing 31 stacked in the axial direction D (the left-right direction in the drawing), and a front side of the first V-packing 31 (in the axial direction D). And an annular male adapter 33 disposed on one side. The high-pressure seal 30 is disposed on the rear side of the first V packing 31 (the other side in the axial direction D) and on the further rear side of the second V packing 32. An annular backup ring (annular member) 34 is provided. As described above, the high-pressure seal 30 includes a plurality of V packings 31 and 32 stacked in the axial direction (predetermined direction) D. The axial direction D is equal to the reciprocating direction of the reciprocating member 8 and is equal to the stacking direction of the first V packing 31, the second V packing 32, the male adapter 33 and the backup ring 34.

  A plurality of (for example, two) first V packings 31 are stacked in the axial direction D. The first V packing 31 is an elastic body made of a rubber system such as NBR or a synthetic resin. The number of the first V-packings 31 provided can be changed depending on the pressure to be held, but is, for example, about 1 to 3 sheets. As shown in FIG. 3A, each of the first V packings 31 has a V-shaped recess 31a provided on the front surface (one surface in the axial direction D). The recessed part 31a has a shape opened toward the front. Each of the first V packings 31 has a V-shaped convex portion 31b provided on the rear surface (the other surface in the axial direction D). The convex portion 31b protrudes rearward.

  As shown in FIG. 3B, in the cross section along the axial direction D, the cross-sectional shapes of the first V packing 31 on the outer peripheral side and the inner peripheral side are lines connecting the centers of the concave portion 31a and the convex portion 31b ( A line symmetric with respect to a line connecting the valley of the recess 31a and the top of the protrusion 31b. The 1st V packing 31 has the inclined surface 31c which inclines at the angle of two steps in each of an outer peripheral side and an inner peripheral side. More specifically, the first V-packing 31 includes a first inclined surface 31d connected to the front surface and extending rearward, and a second inclined surface connected to the rear end of the first inclined surface 31d and extended rearward. 31e. The first inclined surface 31d is inclined at an inclination angle α with respect to the axial direction D. The second inclined surface 31e is inclined at an inclination angle β with respect to the axial direction D. Although the inclination angle α and the inclination angle β are acute angles, the inclination angle β is larger than the inclination angle α. The 2nd inclined surface 31e comprises a part of V shape of the convex part 31b. An annular bent line 31f is formed between the first inclined surface 31d and the second inclined surface 31e.

  A convex portion 33a provided on the rear surface of the male adapter 33 enters and contacts the concave portion 31a of the first V packing 31 disposed at the front end. In other words, the concave portion 31 a of the first V packing 31 receives the convex portion 33 a of the male adapter 33. The male adapter 33 is made of metal, for example. The front surface of the male adapter 33 is in surface contact with the front end surface 14e provided in the enlarged diameter portion 14d of the communication pipe 14. The inner peripheral surface 33b of the male adapter 33 is separated from the outer peripheral surface 8c of the second plunger 8b and is not in contact with the outer peripheral surface 8c of the second plunger 8b. Therefore, the inner peripheral surface 33b of the male adapter 33 does not slide in contact with the second plunger 8b.

  The convex portion 31b of the first V packing 31 arranged at the front end enters and contacts the concave portion 31a of the first V packing 31 arranged second. In other words, the concave portion 31a of the first V packing 31 receives the convex portion 31b of the other first V packing 31 adjacent to the front. A pressing force in the axial direction D from the male adapter 33 is applied to the two first V packings 31, 31.

  As shown in FIG. 3A, the inner peripheral side of the two first V packings 31 pressed toward the rear (the other in the axial direction D, the backup ring 34 side) by the male adapter 33 is 2 is in sliding contact with the outer peripheral surface 8c of the plunger 8b. The outer peripheral side of the first V packing 31 is in close contact with the inner peripheral surface of the enlarged diameter portion 14 d of the communication pipe 14. In other words, the first inclined surface 31d of the first V packing 31 maintains the lip shape, so that the sealing performance by the first V packing 31 is maintained.

  In the high pressure seal 30 of the seal structure B according to the present embodiment, the second V packing 32 having a unique shape is employed. In the high-pressure seal 30, one second V-packing 32 is provided and laminated on the first V-packing 31. The second V packing 32 is made of the same material as the first V packing 31. The second V-packing 32 is an elastic body made of a rubber system such as NBR or a synthetic resin.

  As shown in FIG. 3A, the second V packing 32 has a V-shaped recess 32a provided on the front surface (one surface in the axial direction D). The concave portion 32 a has a shape opened toward the front, and further has the same shape as the concave portion 31 a of the first V packing 31. The second V-packing 32 has a flat surface 32b that forms the rear surface (the other surface in the axial direction D). The width of the flat surface 32b (the length in the direction orthogonal to the axial direction D) is narrower than the width of the front surface of the second V-packing 32 in which the recess 32a is formed. The flat surface 32b is in close contact with (ie, in contact with) the holding surface 34a that forms the front surface of the backup ring 34. Thus, the second V packing 32 is a so-called flat V packing in which the shape of the rear end face is changed from the first V packing 31.

  As shown in FIG. 3C, in the cross section along the axial direction D, the cross-sectional shape of the second V packing 32 on the outer peripheral side and the inner peripheral side is a line connecting the centers of the recess 32 a and the flat surface 32 b ( A line symmetric with respect to a line connecting the valley of the recess 32a and the center of the flat surface 32b. The second V packing 32 has an inclined surface 32c that is inclined at a constant inclination angle on each of the outer peripheral side and the inner peripheral side. More specifically, the second V-packing 32 includes an inclined surface 32c that is provided so as to connect the flat surface 32b and the front surface and is inclined at a certain inclination angle. In other words, the second V-packing 32 is gradually widened from the narrow flat surface 32b to the front surface.

  The inclined surface 32c is inclined at an inclination angle γ with respect to the axial direction D. The inclination angle γ is an acute angle, for example, smaller than the inclination angle β of the second inclined surface 31e. The inclination angle γ is preferably the same as the inclination angle α of the first inclined surface 31d, but may be larger or smaller than the inclination angle α. In the second V-packing 32, the front surface and the flat surface 32b forming the rear surface are connected by a gently tapered plane, so that no bending line is formed between the front surface and the flat surface 32b. .

  The convex portion 31 b of the first V packing 31 disposed at the rear end enters and contacts the concave portion 32 a of the second V packing 32. In other words, the concave portion 32a of the second V packing 32 receives the convex portion 31b of the other first V packing 31 adjacent to the front. A pressing force in the axial direction D from the male adapter 33 is applied to the second V packing 32 via the first V packing 31. On the other hand, the second V packing 32 is supported by a backup ring 34.

  As shown in FIG. 3A, the inner peripheral side of the second V packing 32 pressed toward the rear (the other in the axial direction D, the backup ring 34 side) by the male adapter 33 is the second plunger. 8b is in sliding contact with the outer peripheral surface 8c. The outer peripheral side of the second V packing 32 is in close contact with the inner peripheral surface of the enlarged diameter portion 14 d of the communication pipe 14. In other words, the sealing performance by the second V packing 32 is maintained by maintaining the lip shape of the inclined surface 32 c of the second V packing 32. In addition, the flat surface 32b of the second V-packing 32 is pressed against the holding surface 34a of the backup ring 34, so that the second V-packing 32 in the final stage is held. As described above, the second V packing 32 is a high pressure seal 30 having both the function of receiving the pressure load of the conventional female adapter (see the female adapter 203 in FIG. 4) and the sealing function of the first V packing 31. It is a unique member. The overlapping of the first V-packing 31 and the second V-packing 32 in this way is suitable for a high-pressure seal structure, and is particularly advantageous compared to the case where a single U-packing is used.

  The backup ring 34 is an endless type resin member. The backup ring 34 is made of a synthetic resin such as PEEK (polyether ether ketone). The backup ring 34 is preferably made of a material having lubricity. The backup ring 34 has a rectangular cross section, and is formed so as to connect the flat holding surface 34a forming the front surface, the flat seating surface 34b forming the rear surface, and the holding surface 34a and the seating surface 34b. It has an inner peripheral surface 34c and an outer peripheral surface 34d. The holding surface 34 a holds the first V packing 31 and the second V packing 32 by supporting the flat surface 32 b of the second V packing 32. The seat surface 34 b is in close contact with the front surface of the seal case 3. The outer peripheral surface 34d is fitted into the inner peripheral surface of the enlarged diameter portion 14d of the communication pipe 14. The inner peripheral surface 34c is in a state of being close to the outer peripheral surface 8c of the second plunger 8b by a slight gap.

  According to the seal structure B and the high-pressure seal 30 described above, the male adapter 33 or the recessed portion 31a of the other first V packing 31 enters the recessed portion 31a of the first V packing 31, and the lip shape is maintained. Thus, the sealing performance by the first V packing 31 is maintained. Further, the inclined surface 32c of the second V-packing 32 is formed in the cylinder member 14 or the second plunger 8b in a state where the convex portion 31b of the first V-packing 31 is received in the concave portion 32a of the second V-packing 32. Etc. are pressed against the sealing surface. The second V packing 32 also maintains the same lip shape as that of the first V packing 31 and maintains the sealing performance. Moreover, since the second V-packing 32 has a flat surface 32b on the rear surface (the other surface in the axial direction D), the second V-packing 32 has a holding function similar to that of the female adapter (that is, the first-stage first packing). The function of holding the V-packing 31 is exhibited. Since the second V-packing 32 is made of the same material as the first V-packing 31, it can be produced when the conventional female adapter is made of metal or made of high-strength resin. The problem of wear and damage to the second plunger 8b hardly occurs. As described above, the laminated structure of the V packing in which the first V packing 31 and the second V packing 32 are combined can maintain the sealing performance with a simple configuration.

  Further, by providing the backup ring 34, it is possible to reliably prevent leakage of the used liquid. Further, since the backup ring 34 is made of resin, for example, even when the backup ring 34 is in sliding contact with the reciprocating member 8 or the like, it is easy to prevent the reciprocating member 8 from being worn.

  Further, by providing the endless backup ring 34, the leakage of the final liquid due to pressure can be prevented with a simple shape, and the strength against pressure is sufficiently maintained. Since the backup ring 34 has a rectangular cross section and has a flat holding surface 34a, it is difficult for cracks to occur even if it is made of resin, and the problems of conventional female adapters have been solved. Thereby, a high-pressure sealing property can be reliably maintained.

  Further, by applying the seal structure B to the reciprocating pump 100, the sealing performance can be maintained with a simple configuration with respect to the reciprocating member 8 of the reciprocating pump 100. In particular, when applied to the high-pressure seal 30, a high sealing effect is exhibited by using a plurality of the first V packings 31.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, although the case where an endless type resin member is used as the backup ring 34 has been described in the above embodiment, a bias cut resin member may be used. Further, when applied to a low pressure type seal structure, the backup ring 34 may be omitted. In this case, the flat surface 32b of the second V-packing 32 comes into surface contact with the seal case 3 and the like. In the low pressure type seal structure, the number of first V packings 31 may be reduced. According to such a configuration, the pump can be shortened and compacted in the front-rear direction, and an inexpensive pump can be manufactured.

  The seal structure of the present invention can be applied not only to the reciprocating pump 100 but also to any device as long as it uses V packing to maintain pressure. For example, the seal structure of the present invention can be applied as another pressure booster or a static pressure fixing seal.

  8 ... reciprocating member, 30 ... high pressure seal, 31 ... first V packing, 31a ... concave portion, 31b ... convex portion, 32 ... second V packing, 32a ... concave portion, 32b ... flat surface, 32c ... inclined surface, 33 ... Male adapter, 34 ... Backup ring (annular member), 100 ... Reciprocating pump, B ... Seal structure, D ... Axial direction (predetermined direction, stacking direction), γ ... Inclination angle.

Claims (3)

A seal structure (B) including a plurality of annular V packings laminated in a predetermined direction,
The V packing is
A first V-packing (31) having a recess (31a) on one surface in the stacking direction (D) of the V-packing and having a protrusion (31b) on the other surface in the stacking direction (D);
It is arrange | positioned at the other side of the said 1st V packing (31) in the said lamination direction (D), The said convex part (1) of the said 1st V packing (31) is provided in one surface of the said lamination direction (D). A second V-packing (32) having a recess (32a) for receiving 31b),
The second V-packing (32)
A flat surface (32b) that forms the other surface in the stacking direction (D) and is narrower than the one surface;
An inclined surface (32c) provided so as to connect the flat surface (32b) and the one surface and inclined at a constant inclination angle (γ) with respect to the stacking direction (D). A seal structure (B).   A resin annular member (34) disposed on the other side of the second V-packing (32) in the stacking direction (D) and contacting the flat surface (32b) of the second V-packing (32). The seal structure (B) according to claim 1, comprising: A seal structure (B) of a reciprocating pump (100) including a reciprocating member (8) reciprocating along the stacking direction (D);
The seal structure (B) according to claim 1 or 2, wherein the V packing is in sliding contact with the reciprocating member (8) to prevent leakage of working fluid around the reciprocating member (8).

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