JP2018138811A - Coupling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling structure having excellent assemblability for a member to be attached.SOLUTION: A coupling structure 5 is configured such that bolts 8, 9 are inserted into open holes 6, 7 of a set plate 50, and the bolts 8, 9 are screwed into female screw parts 21a, 31a of a casing 21 and sleeve 31, so that the set plate 50 is attached to the casing 21 and sleeve 31. The bolts 8, 9 include trunk parts 80, 90, male screw parts 81, 92 each formed at one end part of the trunk parts 80, 90 and having a diameter larger than the trunk parts 80, 90, and head parts 82, 92 provided at the other end part of the trunk parts 80, 90 and having a diameter larger than the trunk parts 80, 90. The set plate 50 is made thick, and the open holes 6, 7 of the set plate 50 comprise female screw parts 61, 71 each screwed into the male screw parts 81, 92 of the bolts 8, 9, and first concave parts 60, 70 having a diameter larger than the female screw parts 61, 71 and opened on an end surface of the set plate 50.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a connection structure that is detachably connected to a member to be attached.

  2. Description of the Related Art Conventionally, connection structures for connecting a mounting member to a mounted member so as to be detachable by screwing a bolt are known in various fields. In the field of mechanical seals, there is a cartridge-type mechanical seal that temporarily connects a connecting structure consisting of a set plate (mounting member) and bolts to a casing (attached member), and assembling the mechanical seal is simple (For example, refer to Patent Document 1).

  The mechanical seal shown in Patent Document 1 includes a rotary sealing element including a rotary sealing ring and a sleeve, and a stationary sealing element including a stationary sealing ring and a casing (attachment member) in a usage form. In a state where the sealing ring and the stationary sealing ring are in contact with each other to form a sliding surface, the rotary sealing element is attached to the rotating shaft of the rotating device, and the stationary sealing element is attached to the device housing of the rotating device. When this mechanical seal is attached to the shaft seal between the rotating shaft and the equipment housing, the rotary sealing element and the stationary sealing element are used by a plurality of connecting structures composed of a set plate and a pair of bolts. Are temporarily assembled in substantially the same form.

  Specifically, the connection structure is a thin-walled substantially rectangular plate shape in which a barrel having a male screw portion and a bolt having a head having a larger diameter than the barrel and a through-hole through which the barrel can be inserted are formed. A set plate, the lower end of the set plate is inserted into a locking groove formed on the outer diameter side of the sleeve, and the male threaded portion of the bolt that is inserted through the through hole of the set plate is the shaft of the casing. The rotary seal ring and the stationary seal ring are restricted to a desired axial position by screwing into the female thread formed at the direction end and fixing the set plate to the casing. The ring can be brought into contact with a desired pressure to form a unit in which the rotary sealing element and the stationary sealing element are integrated. The mechanical seal temporarily assembled in this manner can be used by inserting the rotating shaft, fixing the sleeve to the rotating shaft, and then removing the set plate.

Japanese Patent No. 3823207 (page 5, FIG. 5)

  In Patent Document 1, when the set plate is mounted, the bolt body is inserted into the through hole of the set plate in a state in which the position of the through hole of the set plate is aligned with the female screw portion of the casing, and then the casing. The male screw portion of the bolt is screwed into the female screw portion. Since the through hole of the set plate has a larger diameter than the body of the bolt and the set plate is thin, when the bolt body is inserted into the through hole of the set plate, the bolt tilts and the body As a result, the assemblability of the casing was poor.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide a connection structure that is easy to assemble to a member to be attached.

In order to solve the above problems, the connection structure of the present invention is:
A connecting structure for attaching the mounting member to the mounted member by inserting a bolt through the through hole of the mounting member and screwing the bolt into the female screw portion of the mounted member,
The bolt includes a body portion, a male screw portion formed at one end portion of the body portion and having a larger diameter than the body portion, and a head portion formed at the other end portion of the body portion and having a larger diameter than the body portion. And comprising
The mounting member has a thick plate shape, and the through-hole of the mounting member has a female screw portion screwed with a male screw portion of the bolt, a diameter larger than the female screw portion, and the mounting member. It is characterized by being comprised from the recessed part open | released by the end surface of this.
According to this feature, since the concave portion and the female screw portion are formed in the same through-hole of the thick mounting member, the concave portion and the female screw portion are less displaced from each other in the radial direction, and the bolt body portion is attached. A state (hereinafter referred to as “bolt holding state” or “holding state”) inserted through the female screw portion of the member, and a state where the male screw portion of the bolt is received in the recess (hereinafter referred to as “bolt holding state” or “ In the “accommodating state”), the bolt is held substantially parallel to the axial direction of the through hole. Therefore, when the position of the mounting member is aligned with the mounted member in the bolt holding state, the position of the male threaded portion of the bolt matches the position of the female threaded portion of the mounted member. Is easy to assemble.

The through hole is composed of the concave portion, a concave portion formed at an end portion of the mounting member opposite to the concave portion, and the female screw portion formed between the concave portions at both end portions. It is characterized by being.
According to this feature, the concave portions at both ends and the female threaded portion of the mounting member constitute the same through-hole of the thick mounting member, so that there is little displacement in the radial direction of each other, and the male threaded portion of the mounting member When the male screw part is inserted into the concave part located on the side to be inserted from the outside, the male screw part is guided to the concave part, so that the male screw part can be easily screwed into the female screw part of the mounting member. it can.

At least one of the concave portions is longer than the male screw portion in the axial direction.
According to this feature, the mounting member and the mounted member are attached to the mounted member by contacting the opposing end surfaces of the mounting member and the mounted member (hereinafter referred to as “contact state”) while the entire male screw portion is accommodated in the recess. Since the member can be positioned, the positioning of the bolt with respect to the female thread portion of the attached member is simple.

The mounting member is an annular member,
The through hole is a hole penetrating in the axial direction, and a plurality of the through holes are formed in the circumferential direction.
According to this feature, in the bolt holding state, since the plurality of bolts are held substantially parallel to the axial direction, by fastening one bolt to the attached member, the other bolts are female screws of the corresponding attached member. Since the position matches the part, assembly workability is good.

The attached member is formed on the end surface side of the attached member with respect to the female screw portion of the attached member, and is provided with a recess having a diameter larger than that of the female screw portion. Yes.
According to this feature, when the male screw portion protruded from the mounting member is fitted into the concave portion of the attached member, the male screw portion is guided to the concave portion, so that the male screw portion is the female screw portion of the attached member. It can be easily screwed into.

The mounting member includes a fitting portion extending in an axial direction of the through hole that can be fitted into a fitting portion of the attached member.
According to this feature, since the fitting portion of the attachment member is guided to the fitting portion of the attachment member when the contact state is established, the positioning of the attachment member with respect to the attachment member is simple.

The attachment member is characterized in that an engagement portion extending in a direction intersecting with the axis of the through hole that can be engaged with the engagement portion of the attachment member from the axial direction is formed.
According to this feature, when attaching the attachment member to the attachment member, the engagement member of the attachment member is engaged with the engagement portion of the attachment member, thereby positioning the attachment member in the circumferential direction with respect to the attachment member. It can be carried out.

The mounting member is a set plate used when assembling a mechanical seal, and the mounted member is a casing.
According to this feature, when removing the set plate from the casing, it is possible to remove the set plate by setting it in the bolt accommodation state, and since the bolt is in a bolt holding state at this time, it is difficult for the bolt to fall off from the set plate. Bolts are hard to lose.

It is a fragmentary sectional side view of the mechanical seal temporarily assembled by the set plate and the volt | bolt (connection structure) in an Example. (A) is a sectional side view of a set plate, (b) is a front view of a set plate. It is a sectional side view of a set plate and a bolt (connection structure). (A)-(c) is the schematic of the side cross section which showed the procedure at the time of attaching a set plate to a casing.

  EMBODIMENT OF THE INVENTION The form for implementing the mechanical seal which concerns on this invention is demonstrated below based on an Example.

  The mechanical seal which concerns on an Example is demonstrated with reference to FIGS. Hereinafter, the left side of FIG. 1 will be described as the in-machine A side (sealed fluid side) of the mechanical seal, and the right side of FIG. 1 will be described as the out-of-machine B side (atmosphere side) of the mechanical seal. In order to facilitate understanding of the connecting structure 5 including the set plate 50 and the bolts 8 and 9 in the embodiment, first, the mechanical seal 1 in which the set plate 50 is used will be described. Furthermore, for convenience of explanation, the cross section of the mechanical seal 1 and the connection structure 5 shown in FIG. 1 and FIGS. 4A to 4C is a cross section taken along a virtual line PO shown in FIG. 2A and FIG. 3 is a cross section taken along a virtual line POQ shown in FIG. 2B.

  As shown in FIG. 1, a mechanical seal 1 according to the present embodiment is inserted into a rotating device in an automobile, a general industrial machine, etc., through a device housing (not shown) of the rotating device and a shaft hole provided in the device housing. It is attached to seal the shaft seal between the rotary shaft 3 and the set plate 50 described later is used in a removed state. The rotating shaft 3 is generally made of metal such as stainless steel, and when the rotating device is a pump, an impeller (not shown) is attached to the in-machine A side.

  The mechanical seal 1 is mainly composed of stationary sealing elements 20 and 20 ′ attached to the device housing side of the rotary device and a rotary sealing element 30 attached to the rotary shaft 3 side. Moreover, the segment seal unit 40 is also provided in the mechanical seal 1 of the embodiment.

  The stationary sealing element 20 mainly includes a casing 21, a stationary sealing ring 22, a retainer 23, a spring 24, a rotation regulating member 25, and O-rings 28 and 29.

  The stationary seal ring 22 is attached to the retainer 23 via an O-ring 28. The retainer 23 is attached to the casing 21 via an O-ring 29. The O-rings 28 and 29 seal between the two members, and may be replaced with other secondary seals. The same applies to the O-ring in the following description.

  Further, a spring 24 is interposed between the retainer 23 and the casing 21 in a compressed state, and the stationary sealing ring 22 and the retainer 23 are urged toward the in-machine A side by the compressed spring 24.

  The stationary sealing ring 22 has a locking portion 25a extending in the axial direction and on the inner diameter side of the rotation restricting member 25 inserted in an axially extending groove portion 22a formed on the outer diameter side. Movement is regulated. The rotation restricting member 25 is attached to the casing 21 by a bolt (not shown), and its rotation in the circumferential direction is restricted by a knock pin (not shown).

  Further, the rotation restricting member 25 has a through hole penetrating in the radial direction at a position different from the locking portion 25a in the circumferential direction (substantially the same as a through hole 25b ′ of the rotation restricting member 25 ′ described later). The through hole 27 formed in the casing 21 communicates with the through hole 27.

  The stationary sealing element 20 ′ includes a casing 21 ′ having a through hole 27 ′, a stationary sealing ring 22 ′, a retainer 23 ′, a spring 24 ′, a rotation restricting member 25 ′, and O-rings 28 ′ and 29 ′. , Mainly consists of.

  The through hole 27 ′ of the casing 21 ′ communicates with the through hole 25 b ′ of the rotation restricting member 25 ′. The rest of the configuration of the stationary sealing element 20 ′ is substantially the same as the configuration of the stationary sealing element 20 in a state of being substantially horizontally reversed.

  The casings 21, 21 ′ are connected by bolts (not shown) via O-rings 26 that are fitted in grooves 21 a ′ formed on the end surfaces of the casing 21 ′ facing the casing 21.

  The rotary sealing element 30 mainly includes sleeves 31 and 36, a rotary sealing ring 32, a knock pin 33, and O-rings 38 and 39.

  The sleeves 31 and 36 are integrally connected to the sleeve 36 by a bolt 37 in a state where the sleeve 31 is inserted from the axial direction. The connected sleeves 31, 36 are sealed between the rotary shaft 3 by the O-ring 38, and the connected sleeves 31, 36 are inserted by inserting the key 35 between the rotary shaft 3. The rotation is restricted with respect to the rotation shaft 3.

  Since the rotary seal ring 32 is sandwiched between the sleeves 31 and 36 in the axial direction, movement in the axial direction is restricted. An O-ring 39 is interposed in a space 34 formed by connecting the sleeves 31 and 36. Further, since the knock pin 33 attached to the sleeve 31 is inserted into the notch 32a of the rotary seal ring 32, the rotation seal ring 32 is restricted from rotating in the circumferential direction.

  Therefore, the mechanical seal 1 is configured such that the rotary seal ring 32 is sandwiched between the stationary seal rings 22 and 22 ′ and the rotary seal ring 32 by sandwiching the rotary seal ring 32 between the pair of opposed stationary seal rings 22 and 22 ′. This is a so-called double type in which sliding portions S1 and S2 are formed.

  The segment seal unit 40 is mainly composed of a segment seal 41 that is inserted into the sleeve 31 and is urged toward the outside B of the machine, and a holding plate 42 that is fixed to the casing 21 by the bolt 10 (see FIG. 4A). It is configured. The segment seal 41 is attached to the holding plate 42 in a state of being pressed with a desired pressure by fixing the holding plate 42 to the casing 21 with the bolt 10. In this manner, the segment seal 41 seals the contact surface with the sleeve 31 and also seals the contact surface with the holding plate 42. The shape of the holding plate 42 may not be a plate shape.

  The mechanical seal 1 shown in FIG. 1 is temporarily assembled in the same form as the usage form of the mechanical seal 1 by using the set plate 50. Hereinafter, the temporary assembly using the set plate 50 will be described in detail. 1 to 4, for convenience of explanation, peaks 61 a, 71 a, 81 a, 91 a and valleys 61 b, 71 b, 81 b, 91 b, which will be described later, are shown exaggerated and larger than the dimensions actually formed. ing.

  As shown in FIG. 1, the connection structure 5 includes a set plate 50 (attachment member) and two types of bolts 8 and 9 having different lengths. As will be described in detail later, the mechanical seal 1 is temporarily assembled in substantially the same form as the usage pattern by using the set plate 50 as a unit in which the stationary sealing element 20 and the rotary sealing element 30 are integrated.

  As shown in FIGS. 2 (a) and 2 (b), the set plate 50 is made of stainless steel and has a substantially annular shape, and has a small-diameter portion 53, a large-diameter portion 52, and a protruding portion from the side B in the axial direction. 54 (fitting part) is formed, and a shaft hole 51 into which the rotary shaft 3 can be inserted is formed on the inner diameter side thereof. In the present embodiment, the thickness means a solid structure that is longer in the axial direction than the half dimension of the bolts 8 and 9 described later, or a male screw of the bolts 8 and 9 described later. This means a solid structure that is longer in the axial direction than the axial dimensions of the portions 81 and 91. Furthermore, the set plate 50 is not limited to stainless steel, and may be formed of other metals or reinforced resin.

  The large-diameter portion 52 has an outer peripheral surface 52a formed substantially parallel to the shaft hole 51, a side end surface 52b continuous with the outer peripheral surface 52a on the outside B side, and a side end surface 52c continuous with the outer peripheral surface 52a on the in-machine A side. ing.

  The small-diameter portion 53 is formed with an outer peripheral surface 53a that is substantially parallel to the shaft hole 51 and smaller in diameter than the outer peripheral surface 52a, and a side end surface 53b that continues to the outer peripheral surface 53a on the outside B side.

  The protruding portion 54 extends in the axial direction A side and has an annular shape, and has an outer peripheral surface 54a having a smaller diameter than the outer peripheral surface 52a, a side end surface 54b continuous to the outer peripheral surface 54a, and an inner diameter side of the side end surface 54b of the protruding portion 54. And an inner peripheral surface 54c extending substantially in the axial direction from the end portion toward the outside B side.

  Further, the set plate 50 includes a side end surface 55b extending substantially perpendicularly from an end on the outside B side of the inner peripheral surface 54c of the projecting portion 54, and an end on the outside B side from the end on the inner diameter side of the side end surface 55b. An inner peripheral surface 55c extending substantially in the axial direction, a side end surface 55d extending substantially perpendicularly from an end of the inner peripheral surface 55c on the machine outside B side, and an end on the inner diameter side of the side end surface 55d An inner peripheral surface 51a is formed extending in the substantially axial direction from the portion toward the outer side B, and the inner peripheral surface 51a extends substantially perpendicularly to the inner diameter side end of the side end surface 53b of the small diameter portion 53. The shaft hole 51 is defined.

  The set plate 50 is formed with an opening 55 that is recessed from the in-machine A side to the out-of-machine B side on the inner diameter side. Specifically, the opening 55 is defined by a side end surface 55 b, an inner peripheral surface 55 c, and a side end surface 55 d, and the inner diameter of the opening 55 is larger than the inner diameter of the shaft hole 51.

  Further, the set plate 50 has a concave portion 56 (locking) recessed from the side end surface 52c of the large-diameter portion 52 to the approximate center in the axial direction of the large-diameter portion 52 and from the outer peripheral surface 52a into the substantially U-shape in the front view. Part) is formed. The concave portions 56 are radially formed in four equal parts in a front view. The concave portion 56 is arranged at a position different from the through holes 6 and 7 formed on substantially the same line in the radial direction to be described later in the circumferential direction.

  Further, the set plate 50 includes a substantially linear through-hole 6 penetrating from the side end surface 52b of the large diameter portion 52 to the side end surface 52c, and a side end surface 53b of the small diameter portion 53 from the side end surface 55d of the opening 55. A substantially linear through-hole 7 that penetrates therethrough is formed, and the through-holes 6 and 7 are formed in four equal parts in the front view and substantially on the same line in the radial direction.

  The through-hole 6 includes a first recess 60 that is recessed from the side end surface 52c of the large diameter portion 52 toward the outside B of the machine, a female screw portion 61 in which a ridge portion 61a and a valley portion 61b are formed, and a side end surface of the large diameter portion 52. 52b and the second recess 62 (the recess on the opposite side) having the same diameter as the first recess 60 that is recessed toward the in-machine A side. The female screw portion 61 is formed between the recesses 60, 62 and the recess 60, The shaft center of the female screw portion 61 is positioned on substantially the same shaft center as the shaft shaft 62. The inner diameters of the recesses 60 and 62 are formed larger than the inner diameter of the valley portion 61 b of the female screw portion 61.

  The first recess 60 includes an inner peripheral surface 60a extending in a substantially axial direction from the side end surface 52c of the large diameter portion 52 toward the outer side B, and an end portion on the outer side B of the inner peripheral surface 60a. Is defined by a side end surface 60b that extends substantially vertically from the side end surface 60b toward the central axis of the through hole 6. The second recess 62 extends from the side end surface 52b of the large-diameter portion 52 toward the in-machine A side. An inner peripheral surface 62a extending substantially in the axial direction, and a side end surface 62b extending substantially perpendicularly from the end of the inner peripheral surface 62a toward the center B of the through hole 6 from the end on the machine outside B side. It is a space defined by The female screw portion 61 is formed continuously from the side end surface 60b to the side end surface 62b, and a male screw portion 81 of a bolt 8 (see FIG. 3) described later can be screwed together. In addition, the dimension L1 of the axial direction of the 1st recessed part 60 is formed longer than the dimension L2 of the axial direction of the external thread part 81 of the volt | bolt 8 mentioned later (refer FIG. 3).

  Further, the female screw portion 71 of the through hole 7 is formed to be longer in the axial direction than the female screw portion 61 of the through hole 6. Since the other structure is substantially the same as the through-hole 6, the description thereof is omitted.

  Here, the processing method of the through-hole 6 is demonstrated. A pilot hole is formed in the set plate 50 by a drill, and a female screw portion is formed by tapping along the axial direction of the lower hole. Thereafter, each concave portion 60, 62 is formed by a flat bottom drill having a larger diameter than the female screw portion. To drill. The processing order may be an order in which the female screw portion 61 is formed after the recesses 60 and 62 are formed.

  As described above, the concave portions 60 and 62 and the female screw portion 61 at both end portions have substantially the same central axis as the thick set plate 50, and therefore there is little displacement in the radial direction.

  Referring to FIG. 3, the bolt 8 is formed of stainless steel, and includes a body portion 80, a male screw portion 81 having a diameter larger than that of the body portion 80 and formed on an end portion of the body portion 80 on the machine A side, and a body portion. 80, and is formed of a body portion 82 and a head portion 82 having a diameter larger than that of the male screw portion 81. The boundary between the body portion 80 and the head portion 82 is a corner. A tapered neck lower round portion 83 is formed by the meat. Further, the axial dimension of the bolt 8 is formed to be longer than the axial dimension of the through hole 6. The bolt 8 is not limited to stainless steel, and may be formed of other metals or reinforced resin.

  The body portion 80 of the bolt 8 is formed to have substantially the same outer diameter, which is slightly smaller than the inner diameter of the crest portion 61 a of the female screw portion 61 of the through hole 6. And the female thread part 61 can be inserted.

  The male screw portion 81 of the bolt 8 is composed of a flat front end surface 81c located on the in-machine A side, and a crest portion 81a and a trough portion 81b substantially perpendicular to the front end surface 81c. The part 61 is formed so as to be screwable. The outer diameter of the trough portion 81b of the bolt 8 is described as being substantially the same as the outer diameter of the barrel portion 80 of the bolt 8 in the drawing, but is actually larger than the outer diameter of the barrel portion 80. Is formed.

  The head portion 82 of the bolt 8 includes a seat surface 82c that extends substantially perpendicularly from an end portion on the outside B side of the body portion 80 of the bolt 8, and an end portion on the outside B side from the end portion on the outer diameter side of the seat surface 82c. Is formed mainly from an outer peripheral surface 82a extending substantially perpendicularly toward the head and a zenith surface 82b extending substantially perpendicularly from an end of the outer peripheral surface 82a on the outside B side. 82b is formed with a fitting groove 85 into which a tool is fitted during the tightening / loosening operation. Further, the outer diameter of the head portion 82 is formed larger than the concave portions 60 and 62 of the through hole 6. When the bolt 8 is screwed into the female screw portion 61 of the set plate 50 or the female screw portion 21a of the casing 21 described later, the axial centers of the female screw portions 61 and 21a and the bolt 8 are substantially concentric (that is, In accordance with the fact that the different axis centers are positioned on substantially the same line), the tool fitted in the fitting groove 85 can be screwed by rotating in a predetermined direction.

  The bolt 9 can be inserted into the recesses 70 and 72 and the female screw portion 71 of the through hole 7, and the axial dimension is longer than the axial dimension of the through hole 7. Are formed shorter than the bolt 8. Specifically, the body portion 90 is formed to be shorter than the body portion 80 of the bolt 8, the male screw portion 91 is formed to be longer than the male screw portion 81 of the bolt 8, and the head portion 92 is formed of the bolt 8. The head 82 is formed to have substantially the same dimension in the axial direction. Since other structures are substantially the same as the bolt 8, the description thereof is omitted.

  Next, a mode in which the set plate 50 is assembled to the casing 21 and the mechanical seal 1 is temporarily assembled will be described with reference to FIGS.

  First, a mode in which the bolts 8 and 9 are assembled to the set plate 50 will be described. In addition, about the assembly | attachment of the volt | bolt 9, only a different point from the assembly | attachment of the volt | bolt 8 is demonstrated.

  When the male thread 81 of the bolt 8 is inserted into the second recess 62 of the through hole 6, the male thread 81 abuts against the inner peripheral surface 62 a of the second recess 62 and is guided in the axial direction. 81 can be easily screwed into the female screw portion 61.

  Further, the bolt 8 is screwed into the female screw portion 61 of the through-hole 6 after the male screw portion 81 is screwed, and then the bolt 8 is further screwed, so that the male screw portion 81 in the axial direction is shown in FIG. It will be in the state (bolt holding state) where the body part 80 was located in the female screw part 61 beyond the internal thread part 61, and the male screw part 81 was accommodated in the 1st recessed part 60 (bolt accommodation state). The bolt accommodation state refers to a state in which all of the male screw portion 81 is accommodated in the first recess 60.

  In the bolt holding state, the movement of the bolt 8 toward the in-machine A side and the out-of-machine B side is restricted, and the bolt 8 is prevented from coming off. That is, since the outer diameter of the head portion 82 is formed larger than the inner diameter of the second recess 62 of the through hole 6, the movement of the bolt 8 toward the in-machine A side is restricted. Since the outer diameter of the peak portion 81a is formed larger than the outer diameter of the female screw portion 61, the movement of the bolt 8 to the outside B side is restricted.

  Further, since the body portion 80 of the bolt 8 is held substantially parallel to the axial direction of the through-hole 6 by the female screw portion 61 of the through-hole 6 when in the bolt-holding state, the casing described later in detail in the bolt-holding state. When the position of the set plate 50 is aligned with respect to 21, the position of the male threaded portion 81 of the bolt 8 matches the position of the female threaded portion 21a of the casing 21, which will be described later. Good. Further, since the body portion 80 of the bolt 8 is held substantially parallel to the axial direction of the through hole 6 when in the bolt holding state, the male screw portion 81 of the bolt 8 is caught by the side end surface 52 c of the first recess 60. It is difficult and it is easy to make the bolt 8 into a bolt accommodation state.

  The segment seal unit 40 is pre-assembled to the casing 21 by the bolt 10 described above. Note that a female screw portion (not shown) of the casing 21 to which the bolt 10 shown only by a broken line is attached and a through hole (not shown) of the holding plate 42 are a female screw portion 21a of the casing 21 and a through hole 43 of the holding plate 42 which will be described later. Are formed at different positions in the circumferential direction of the casing 21.

  The casing 21 is formed with an annular groove 21c into which the holding plate 42 can be fitted on the side end surface 21b side on the outside B side. The groove 21c extends from the inner diameter side end of the side end surface 21b to the in-machine A side. The inner peripheral surface 21d extends in the axial direction, and the side end surface 21e extends from the end A side end of the inner peripheral surface 21d toward the inner diameter side. The casing 21 is provided with a female screw portion 21a into which the bolt 8 is screwed. The female screw portion 21a is open to the side end face 21e and is formed substantially parallel to the axial direction.

  The sleeve 31 is formed in a substantially cylindrical shape, and a female thread portion 31a extending in the axial direction is formed on the side end surface 31b on the outside B side. The sleeve 31 includes a first outer peripheral surface 31c extending substantially perpendicularly from the outer diameter side end surface of the side end surface 31b to the in-machine A side, and gradually from the out-machine B side of the first outer peripheral surface 31c to the in-machine A side. A tapered surface 31d having a large diameter and a second outer peripheral surface 31e extending in the axial direction from the outside B side of the tapered surface 31d are formed. The female screw portion 31a is formed so as to be screwable with the male screw portion 91 of the bolt 9.

  The holding plate 42 is formed in a substantially annular shape, and includes a side end surface 42b on the outside B side, a side end surface 42c on the inside A side, an outer peripheral surface 42d on the outer diameter side, and an inner peripheral surface 42e on the inner diameter side. It is defined and formed in a substantially rectangular shape in a side sectional view as shown in FIG. Further, the holding plate 42 is formed with a through hole 43 (a recessed portion of the attached member) penetrating between the side end faces 42b and 42c substantially parallel to the axial direction. The inner diameter of the through hole 43 is formed to have substantially the same size as the inner diameter of the recesses 60 and 62 in the through hole 6.

  Further, when the holding plate 42 is fixed to the casing 21 by the bolt 10, the through hole 43 of the holding plate 42 and the female screw portion 21a of the casing 21 are formed with each other so that the axial centers thereof are substantially the same straight line. Yes.

  The female screw portion 21a of the casing 21 and the through hole 43 of the holding plate 42 and the female screw portion 31a of the sleeve 31 are formed in four equal parts in the circumferential direction and substantially on the same line in the axial direction. The axial center of the female screw portion 21a of the casing 21 and the through hole 43 of the holding plate 42 and the through hole 6 of the set plate 50 is the axial center of the female screw portion 31a of the sleeve 31 and the through hole 7 of the set plate 50. Are formed so as to be substantially concentric with each other.

  A procedure for temporarily assembling the mechanical seal 1 will be described. First, as described above, the bolts 8 and 9 are attached to the set plate 50 to obtain a bolt accommodation state. In addition, about the mechanical seal 1, the stationary sealing element 20 (refer FIG. 1), the rotation sealing element 30 (refer FIG. 1), and the segment seal unit 40 are made into the state which has arrange | positioned substantially the same at the time of use, respectively. At this time, the stationary seal ring 22 (see FIG. 1) and the rotary seal ring 32 (see FIG. 1) of the mechanical seal 1 are not in contact with each other at a desired pressure.

  An annular space 11 (fitted part) is formed between the inner peripheral surface 42e of the holding plate 42 and the second outer peripheral surface 31e of the sleeve 31, and when the set plate 50 is assembled to the casing 21, Since the protrusions 54 (fitting portions) of the set plate 50 are inserted into the annular space 11, the respective surfaces come into contact with each other as described later, and the radial position of the set plate 50 can be adjusted. The positioning of the set plate 50 with respect to the holding plate 42 and the casing 21 when making the contact state is simple.

  When the protrusion 54 is inserted into the annular space 11, the protrusion 54 is guided to the space 11 by the tapered surface 31 d of the sleeve 31, so that the set plate 50 is positioned in the radial direction with respect to the casing 21. Is easy.

  As shown in FIG. 4B, when the protruding portion 54 is inserted into the space 11, the outer peripheral surface 54 a of the protruding portion 54 is connected to the inner peripheral surface 42 e of the holding plate 42 in detail. The inner peripheral surface 54c of the protrusion 54 is formed on the outer peripheral surface 31e, the inner peripheral surface 55c of the opening 55 is formed on the first outer peripheral surface 31c of the sleeve 31, and the side end surface 55d of the opening 55 is formed on the side end surface 31b of the sleeve 31, respectively. The surface is in contact. At this time, the head portion 10a (the engaged portion) of the bolt 10 (see FIG. 4A) is loosely fitted in the concave portion 56 (the engaging portion) of the opposing set plate 50.

  Further, by inserting the protruding portion 54 of the set plate 50 into the space 11, the axis of the sleeve 31 and the axis of the set plate 50 can be made substantially concentric, and the protruding portion is formed on the inner peripheral surface 42 e of the holding plate 42. 54 is in contact with the second outer peripheral surface 31e of the sleeve 31 and the inner peripheral surface 55c of the opening 55 is in contact with the outer peripheral surface 54a. It is regulated by.

  In addition, the head plate 10 a of the bolt 10 is loosely fitted into the recess 56 of the set plate 50, so that the position of the set plate 50 in the substantially circumferential direction is adjusted with respect to the casing 21. By slightly rotating and moving the set plate 50 from this state, the through hole 6, the through hole 43 of the holding plate 42, and the female threaded portion 21a of the casing 21 are substantially continuous in the axial direction.

  In this state, as shown in FIG. 4C, the set plate 50 is fixed to the casing 21 and the sleeve 31 with the bolts 8. Thereby, the bolt 8 can be easily assembled to the through hole 43 of the holding plate 42 and the female screw portion 21 a of the casing 21. Since the fixing of the bolt 9 is substantially the same, the description thereof is omitted.

  More specifically, the bolts 8 and 9 held in the through holes 6 and 7 when the set plate 50 is positioned on the casing 21 are substantially parallel to the axial direction of the through holes 6 and 7, and the through holes 6, the through-hole 43, and the female screw portion 21 a are substantially concentric with each other, and similarly, the through-hole 7 and the female screw portion 31 a are substantially concentric with each other. Therefore, the bolts 8 and 9 are positioned with the opposed female screw portions 21a and 31a, respectively, and it is easy to screw the bolts 8 and 9 into the female screw portions 21a and 31a.

  Further, the set plate 50 has a through hole 43 of one holding plate 42 and the axial center of the female screw portion 21a of the casing 21 and the axial center of the through hole 6 substantially concentric, thereby allowing the other holding plate 42 to penetrate. The axial centers of the hole 43 and the female screw portion 21a of the casing 21 and the through hole 6 and the female screw portion 31a and the through hole 7 are also substantially concentric. Since one bolt 8 is fastened to the female screw portion 21a of the casing 21 in one place, the other bolts 8, 9,... Are aligned with the corresponding female screw portions 21a, 31a of the casing 21 and the sleeve 31, The assembly workability of the set plate 50 with respect to the casing 21 is good.

  When positioning the set plate 50 on the casing 21, the casing 21 and the bolts 8 and 9 are held in the through holes 6 and 7 and do not fall off from the set plate 50. It has become easy.

  Further, when the bolts 8 and 9 are in the bolt accommodation state, the bolts 8 and 9 do not interfere with the opposing holding plate 42 and the side end faces 42b and 31b of the sleeve 31, and the inboard A Even when the male screw portions 81 and 91 of the bolts 8 and 9 protrude from the side, they are pushed back to the first recesses 60 and 70 by contacting the holding plate 42 and the side end faces 42b and 31b of the sleeve 31, respectively. Therefore, the positioning of the set plate 50 with respect to the casing 21 in the axial direction and the radial direction is hardly hindered.

  Moreover, since the front end surfaces 81c and 91c of the bolts 8 and 9 are formed flat, even if they contact the holding plate 42 and the side end surfaces 42b and 31b of the sleeve 31 which are opposed to each other, the end surfaces 81c and 91c are not easily damaged. Since it is easy to come into surface contact with 31b, the inclination in the axial direction is small when pushed back.

  Accordingly, the set plate 50 can be positioned in a state where the side end surfaces 52c and 55d of the set plate 50 are in contact with the opposing holding plate 42 and the side end surfaces 42b and 31b of the sleeve 31 in the bolt accommodation state. The positioning of the bolts 8 and 9 with respect to the female screw portions 21a and 31a of the casing 21 and the sleeve 31 is simple.

  In the bolt holding state, the bolt 8 is substantially parallel to the axis of the through hole 43 of the holding plate 42. Further, in a state where the set plate 50 is closely and positioned on the casing 21, the first recess 60 and the through hole 43 are continuous in the axial direction. Therefore, the male screw portion 81 of the bolt 8 is guided by the first recess 60 and the through-hole 43 and can be inserted into the female screw portion 21a of the casing 21 and can be easily screwed into the female screw portion 21a.

  As for the bolt 9, similarly to the bolt 8, the male screw portion 91 can be easily screwed into the female screw portion 31 a of the sleeve 31.

  From these things, it is easy to attach the set plate 50 to the casing 21 with the bolts 8 and 9, and the mechanical seal 1 can be temporarily assembled as shown in FIG. 4 (c).

  Further, by screwing the bolts 8 and 9 into the female screw portions 21a and 31a of the casing 21 and the sleeve 31, as shown in FIG. 1, the stationary seal ring 22 and the rotary seal ring 32 are applied with a desired pressure. Since the sliding portions S1 and S2 can be formed in contact with each other, the temporary assembly of the mechanical seal 1 can be easily performed.

  4C, when the bolts 8 and 9 are screwed into the female screw portions 21a and 31a of the casing 21 and the sleeve 31, the second concave portions 62 and 72 of the through holes 6 and 7 are fitted. Since the neck lower round portions 83 and 93 of the bolts 8 and 9 are fitted, the seat surfaces 82c and 92c of the heads 82 and 92 of the bolts 8 and 9 are securely brought into contact with the side end surfaces 52b and 53b of the set plate 50. be able to. Therefore, the stationary seal ring 22 (see FIG. 1) and the rotary seal ring 32 (see FIG. 1) can be brought into contact with each other more reliably with a desired pressure.

  Next, a mode in which the set plate 50 is removed from the mechanical seal 1 after the temporarily assembled mechanical seal 1 is attached to the shaft seal portion of the rotating device will be described.

  From the state of FIG. 4 (c), the bolts 8 and 9 are loosened, and the bolts 8 and 9 are disengaged from the casing 21 and the female threaded portions 21a and 31a of the sleeve 31, respectively, to be in a non-engaged state. (FIG. 4B). In the state of FIG. 4B, the male screw portions 81 and 91 of the bolts 8 and 9 are substantially between the side end surfaces 60 b and 70 b of the through holes 6 and 7 and the female screw portions 21 a and 31 a of the casing 21 and the sleeve 31. Since it is movable in the axial direction, it is easy for the operator to understand that the bolts 8 and 9 have been detached from the female screw portions 21a and 31a.

  Further, even if the bolts 8 and 9 are removed from the female screw portions 21a and 31a of the casing 21 and the sleeve 31, respectively, the bolts 8 and 9 are held by the through holes 6 and 7, so that fingers and other tools can be used. Even if the bolts 8 and 9 are not held, the bolts 8 and 9 can be prevented from falling off the set plate 50.

  As a result, as shown in FIG. 4A, the set plate 50 is moved to the outboard B side with the bolts 8 and 9 disengaged from the female screw portions 21a and 31a of the casing 21 and the sleeve 31, respectively. Since the bolts 8 and 9 are held on the set plate 50 by being moved, the set plate 50 can be removed without losing the bolts 8 and 9.

  When removing the bolts 8 and 9 from the set plate 50 (that is, disassembling the connecting structure 5), the male screw portions 81 and 91 of the bolts 8 and 9 are replaced with the female screw portions 61 and 71 of the through holes 6 and 7, respectively. Since the bolts 8 and 9 can be removed from the through holes 6 and 7 by rotating from the in-machine A side toward the out-of-machine B side, the bolts 8 and 9 can be easily disassembled.

  After the set plate 50 is removed, a fixing member (not shown) that is fixed in the axial direction is attached to the sleeve 31 to fix the sleeve 31 to the rotary shaft 3. Thereby, the mechanical seal 1 becomes a usable state.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the mechanical seal 1 has been described as an aspect including the segment seal unit 40, but the present invention is not limited thereto, and may be a mechanical seal that does not include the segment seal unit 40.

  Further, the mechanical seal 1 has been described as an embodiment in which the female screw portion 21 a is formed in the casing 21 and the through hole 43 is formed in the holding plate 42, but the present invention is not limited thereto, and a recess and a female screw portion are formed in the casing 21. May be.

  Although the set plate 50 has been described as being formed in a substantially annular shape, the present invention is not limited to this, and the set plate 50 may be divided into a plurality of pieces, and the shape of the set plate may be a rectangular shape or a triangular shape when viewed from the front. .

  Moreover, although the set plate 50 was demonstrated as an aspect provided with the large diameter part 52, the small diameter part 53, and the protrusion part 54, not only this but the large diameter part 52 and the small diameter part 53 may be comprised, and it is large. It may be configured only by the diameter portion 52, and is not limited to the shape in the above embodiment.

  In addition, the set plate 50 has been described as an embodiment in which the through holes 6 and 7 and the concave portions 56 are formed in four equal parts, but the present invention is not limited to this, and only one place may be formed. Other than the above, it may be formed in a plurality of equal distributions, or may not be uniform distribution.

  In addition, the set plate 50 has been described as an embodiment in which the concave portions 56 into which the bolts 10 can be loosely fitted are formed in four equal distributions. However, the present invention is not limited to this. Other than the above, it may be formed in a plurality of equal distributions, may not be even distribution, and may not be formed further.

  The bolts 8 and 9 have been described as a mode in which the axial centers of the bolts 8 and 9 are guided substantially concentrically with the axial centers of the through holes 6 and 7 in the state where the bolts 8 and 9 are held in the through holes 6 and 7. If the shafts of the bolts 8 and 9 can be guided substantially concentrically with the shafts 6 and 7, the body portions 80 and 90 of the bolts 8 and 9 are loosely fitted into the female screw portions 61 and 71 of the through holes 6 and 7. You may hold | maintain in the state made.

  Further, the bolts 8 and 9 have been described as a mode in which the fitting grooves 85 and 95 for fitting the tools to the heads 82 and 92 are formed. However, the present invention is not limited to this, and the outer peripheral surface of the head is clamped by the tools. The aspect which makes it possible may be sufficient and does not limit the head of a bolt.

  Although the to-be-engaged part was demonstrated as the aspect which is the head 10a of the volt | bolt 10, it is not restricted to this, You may form directly in the casing 21, the holding plate 42, etc.

  The mechanical seal 1 has been described as a double type, but is not limited thereto, and may be a single type or a tandem type, and does not limit the type of the mechanical seal.

  In addition, the mechanical seal set plate and the bolt have been described as an example of the connection structure. However, any structure other than the mechanical seal may be used as long as the attachment member is detachably connected to the attachment member by screwing the bolt. May be.

DESCRIPTION OF SYMBOLS 1 Mechanical seal 3 Rotating shaft 5 Connection structure 6, 7 Through-hole 8, 9 Bolt 10 Bolt 10a Bolt head (engaged part)
11 Space (Fitting part)
21 Casing (attached member)
21a Female thread part 31 Sleeve (attached member)
31a Female thread part 42 Holding plate (attached member)
43 Through hole (recessed part of mounted member)
50 Set plate (mounting member)
54 Protruding part (fitting part)
56 Recess (engagement part)
60, 70 First recess (recess)
61, 71 Female thread portion 62, 72 Second recess (recess on the opposite side)
80, 90 Body 81, 91 Male thread part 82, 92 Head A In-machine B Out-of-machine L1, L2 Axial dimension S1, S2 Sliding part

Claims (8)

A connecting structure for attaching the mounting member to the mounted member by inserting a bolt through the through hole of the mounting member and screwing the bolt into the female screw portion of the mounted member,
The bolt includes a body portion, a male screw portion formed at one end portion of the body portion and having a larger diameter than the body portion, and a head portion formed at the other end portion of the body portion and having a larger diameter than the body portion. And comprising
The mounting member has a thick plate shape, and the through-hole of the mounting member has a female screw portion screwed with a male screw portion of the bolt, a diameter larger than the female screw portion, and the mounting member. And a recess open to the end face of the connecting structure.   The through hole is composed of the concave portion, a concave portion formed at an end portion of the mounting member opposite to the concave portion, and the female screw portion formed between the concave portions at both end portions. The connecting structure according to claim 1, wherein:   The connection structure according to claim 2, wherein at least one of the concave portions is longer than the male screw portion in the axial direction. The mounting member is an annular member,
The connection structure according to claim 1, wherein the through-hole is a hole penetrating in the axial direction, and a plurality of the through-holes are formed in the circumferential direction.   The attached member is formed on the end surface side of the attached member with respect to the female screw portion of the attached member, and is provided with a recess having a diameter larger than that of the female screw portion. The connecting structure according to any one of claims 1 to 4.   The said attachment member is equipped with the fitting part extended in the axial direction of the said through-hole which can be inserted in the to-be-fitted part of the said to-be-attached member, The one of Claim 1 thru | or 5 characterized by the above-mentioned. Linked structure.   The engagement member is formed with an engagement portion extending in a direction intersecting with an axis of the through hole that can be engaged with an engagement portion of the attachment member from an axial direction. 7. The connection structure according to any one of 6.   The connection structure according to claim 1, wherein the attachment member is a set plate used when a mechanical seal is assembled, and the attachment member is a casing.

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