JP2014185627A - Resin delivery pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin delivery pump which can reliably prevent molten resin from leaking to an external part.SOLUTION: A gear pump includes a pair of rotation delivery parts which rotate molten resin molten by heating in an internal part of a main body around respectively other shaft bodies, a driving shaft among the shaft bodies is provided with an edge side part which penetrates a lateral wall of the main body and is extended to an external part of the main body, seal parts for sealing the molten resin which is sent into the main body, leaks to an external part of the main body from a penetration part of the shaft body on the lateral wall of the main body is arranged on an external part of the main body, a first seal mechanism part of the seal parts is arranged along the longitudinal direction of the edge side part of the driving shaft and is configured so as to push back molten resin that leaks, to the internal part side of the main body accompanied by rotation of the driving shaft, a second seal mechanism part of the seal part is arranged so as to cover an outer circumferential part of the first seal mechanism part and is provided with a cooling region part which retains refrigerant for cooling the molten resin that leaks and the cooling region part is shifted to the axial center direction outer side of the driving shaft with respect to the penetration part.

Description

  The present invention relates to a resin delivery pump for delivering molten resin melted by heating from one side to the other side.

  The following Patent Document 1 has been proposed as this type of resin delivery pump. The resin delivery pump described in Patent Document 1 is configured to send a molten resin melted by heating from a first extruder (one side) toward a second extruder (the other side). In this resin delivery pump, a pair of gear rotors are housed in a pump main body (pump body), and the end side portion of the shaft body of each gear rotor penetrates the side wall of the pump main body and protrudes laterally.

  The resin delivery pump includes a seal portion. In the seal portion, molten resin sent into the pump body while receiving pressure is prevented from leaking out of the pump body from the penetrating portion of the shaft body on the side wall of the pump body. In this case, a visco seal is used as the seal portion. The visco seal is attached to the end side portion of the shaft body so as to be in contact with the side wall of the pump body.

JP 2002-139064 A

  Like the above-mentioned conventional resin delivery pump, the Bisco seal that is the seal part is fitted on the end side of the shaft projecting from the pump body, and attached so as to contact the side wall of the pump body If it is only applied, the molten resin may leak out of the seal portion depending on the pressure applied to the molten resin.

  Then, this invention aims at provision of the resin delivery pump which can prevent reliably that a molten resin leaks outside.

  The present invention relates to a flow path for sending molten resin melted by heating from one side to the other side of the pump body, and a pair of rotary feeds that rotate around different shaft bodies in the flow path. And at least one of the shaft bodies includes an end side portion that extends through the side wall of the pump main body and extends to the outside of the pump main body, and is sent into the pump main body to be side walls of the pump main body. A seal portion for sealing molten resin leaking from the penetrating portion of the shaft body to the outside of the pump body is disposed outside the pump body, and the seal portion includes a first seal mechanism portion and a second seal mechanism. The first seal mechanism is disposed along the longitudinal direction of the end side portion of the shaft body, and the leaked molten resin is moved to the inside of the pump body along with the rotation of the shaft body. Configured to push back, said second seal The structure portion is disposed so as to cover the outer peripheral portion of the first seal mechanism portion, and includes a cooling region portion that holds a refrigerant for cooling the leaked molten resin, and the cooling region portion includes the cooling region portion, It is characterized by being displaced with respect to the penetrating portion on the outer side in the axial direction of the shaft body.

  In the above configuration, the molten resin in the flow path of the pump body leaks out from the penetrating portion of the shaft body on the side wall of the pump body to the outside of the pump body due to the rotation of a pair of rotation delivery parts that rotate around another shaft body. The molten resin is not solidified in the vicinity of the penetrating portion while the cooling region portion of the second seal mechanism portion is displaced outward in the axial direction of the shaft body with respect to the penetrating portion. The molten resin that has been pushed back to the inside of the pump main body by the first seal mechanism with the rotation and has reached the portion corresponding to the cooling region is forcibly cooled and solidified by the refrigerant.

  In the resin delivery pump of the present invention, a configuration in which a visco seal is used as the first seal portion can be employed. According to this configuration, the molten resin is pushed back to the inside of the pump body by the visco seal as the shaft body rotates, and sealed.

  According to the resin delivery pump of the present invention, the cooling region portion of the second seal mechanism portion is displaced to the outside in the axial direction of the shaft body with respect to the penetrating portion, so that it is not solidified in the vicinity of the penetrating portion. On the other hand, as the shaft body rotates, it is pushed back to the inside of the pump body by the first seal mechanism, and the molten resin that reaches the portion corresponding to the cooling region is cooled and solidified. It is possible to reliably prevent leakage to the outside of the pump.

1 is a front sectional view of a gear pump that represents an embodiment of the present invention and is laid in a resin sheet manufacturing facility. FIG. FIG. It is a plane sectional view of the seal part with which the gear pump was provided. It is the same side view.

  Hereinafter, an embodiment of a resin delivery pump according to the present invention will be described. In this case, the resin delivery pump is a gear pump. As a schematic configuration of a resin sheet manufacturing facility using a gear pump, this is a polystyrene resin foam sheet manufacturing facility. The production facility includes a tandem type extruder as an extruder for melt-kneading a polystyrene resin composition containing a foaming agent. The tandem type extruder includes an upstream side extruder and a downstream side extruder. The upstream side extruder and the downstream side extruder are connected in communication by a connecting path.

  As shown in FIGS. 1 to 4, a gear pump 1 that is a resin delivery pump is disposed in the middle of the connecting path. The gear pump 1 is connected to a drive motor via a speed reducer. The gear pump 1 includes a box-shaped pump body 2, a rotation delivery unit 3, and a seal unit 4.

  The pump body 2 is attached to both sides (open sides) of the interior box 5 separately from the interior box 5 and the interior box 5 formed in a rectangular parallelepiped box shape with both sides open. A pair of side walls (also referred to as side plates) 6 and 7 are provided. The side walls 6 and 7 are formed in a flat plate shape, and are fixed by bolts B <b> 1 so as to be in close contact with both sides of the interior box 5. The side walls 6 and 7 are formed with insertion holes 6a and 7a for inserting end side portions 9 and 10 of the drive shaft 8, which will be described later.

  As shown in FIG. 2, a resin intake port 11 and a resin discharge port 12 are formed on each side surface (side surface to which the side walls 6 and 7 are not attached) of the inner peripheral box body 5 facing each other in one direction. Yes. The resin intake 11 is connected to the upstream extruder side in the connection path. The resin discharge port 12 is connected to the downstream extruder side in the connection path.

  Inside the interior box 5, a molten resin flow path 13 for sending the molten resin from the resin intake port 11 toward the resin discharge port 12 is formed. That is, the resin intake port 11 and the resin discharge port 12 are communicated with each other via the flow path 13. The flow path 13 is formed to have a larger capacity than the resin intake port 11 and the resin discharge port 12 because of the interior of the rotation delivery unit 3 described later.

  The flow path 13 includes a pair of rotation delivery units 3 that rotate around different shaft bodies. In this case, the rotation delivery unit 3 is a drive gear 14 and a driven gear 15. One of the other shafts is the drive shaft 8 fitted with a drive gear 14 and the other is a driven shaft 16 fitted with a driven gear 15 (see FIG. 2).

  The drive shaft 8 and the driven shaft 16 are arranged in parallel to each other, and the shaft centers thereof are arranged in the same vertical plane in plan view. The drive shaft 8 and the driven shaft 16 are spaced apart from each other in the vertical direction when viewed from the front. The drive gear 14 and the driven gear 15 are rotatably mounted in the flow path 13 together with the drive shaft 8 and the driven shaft 16 in a state where the outer peripheral teeth are engaged with each other.

  The drive shaft 8 includes the end side portions 9 and 10 that extend through the side walls 6 and 7 to the outside of the pump body 2 on both sides in the axial direction. The end side portions 9 and 10 are inserted through insertion holes 6a and 7a, respectively, and the end side portions 9 and 10 are rotatably supported by the interior box 5 by bearings (for example, rolling bearings). The drive shaft 8 is connected to a speed reducer.

  Both side portions of the driven shaft 16 are fitted and supported in support recesses (not shown) formed in the side walls 6 and 7. The support recess is formed in the side walls 6 and 7 up to a middle portion in the thickness direction of the side walls 6 and 7 and does not penetrate the side walls 6 and 7. Both side portions of the driven shaft 16 are also rotatably supported by the interior box 5 via bearings (reference numerals omitted).

  The gear pump 1 includes the seal part 4. The seal portion 4 is for sealing the molten resin leaking from the pump body 2. The molten resin is sent from the upstream side extruder to the inside of the pump body 2 (flow path 13) through the connecting path, and is sent to the downstream side extruder. However, the molten resin may leak out of the pump body 2 from the gap in the penetrating portion of the shaft body (in this case, the drive shaft 8) on the side walls 6 and 7 of the pump body 2 depending on the pressure received. . The seal portion 4 prevents such molten resin from leaking out of the gear pump 1.

  The seal portion 4 is provided outside the pump body 2. That is, the seal portion 4 is disposed outside the side walls 6 and 7 of the pump body 2. Since each seal part 4 is a right-and-left symmetrical structure, in the following description, description of the structure of the seal part 4 of one side is combined with description of the structure of the seal part 4 of the other side.

  The seal unit 4 includes a seal unit body 20. The seal body 20 includes an inner member 21 on the radially inner side, an outer member 22 fitted on the radially outer side of the inner member 21, and a presser plate disposed on the outer side in the axial center direction of the inner member 21 and the outer member 22. 23. Both the inner member 21 and the outer member 22 are formed in a cylindrical shape, and the seal body 20 as a whole is also formed in a cylindrical shape. Both the inner member 21 and the outer member 22 are set to the same length in the axial direction.

  The radial thickness of the inner member 21 is thinner than the radial thickness of the outer member 22. The inner member 21 includes an annular flange 24 having an enlarged diameter at the outer end in the axial direction. An annular recess for holding the annular packing 25 is formed on the radially inner side of the flange portion 24. The packing 25 is fitted on the outer peripheral portion of the end side portion 9 of the drive shaft 8.

  The outer member 22 is integrally formed from a fitting portion 26 formed to have a predetermined radial thickness and fitted to the outer peripheral surface of the inner member 21, and a fin portion 27 formed on the radially outer side of the fitting portion 26. Is formed. The fitting portion 26 is integrally provided with an extended portion that extends so as to protrude inward in the axial direction with respect to the fin portion 27. The fitting portion 26 includes an enlarged fitting region portion 29 whose inner diameter is enlarged and fitted to the outer peripheral surface of the flange portion 24 of the inner member 21.

  A region corresponding to the radially inner side of the extended portion in the extended portion and the inner member 21 corresponds to a convex portion 17 described later. Further, as shown in FIGS. 3 and 4, the fin portion 27 is formed with a bolt insertion hole 27a along the axial direction. A plurality of bolt insertion holes 27 a are formed at equal intervals in the circumferential direction of the fin portion 27. And as shown in FIG. 2, the outer side member 22 is being fixed to the side wall 6 with the volt | bolt B2 penetrated by each bolt penetration hole 27a.

  The presser plate 23 is formed in an annular shape, and a hole 23a into which the end side portion 9 of the drive shaft 8 is inserted is formed at the center. The presser plate 23 is fixed to the outer end surface in the axial direction of the outer member 22 with a bolt B3. In the presser plate 23, a press ring 30 for pressing the packing 25 held in the concave portion of the flange portion 24 from the side (outside in the axial direction) is formed in a portion corresponding to the outer periphery of the hole 23a.

  As shown in FIG. 3, the seal portion 4 includes a first seal mechanism portion 31, a second seal mechanism portion 32, and a third seal mechanism portion 33. First, for convenience of explanation, the third seal mechanism 33 having a configuration based on the relationship between the seal body 20 and the side wall 6 will be described.

  The third seal mechanism portion 33 is configured to seal the molten resin by fitting the convex portion 17 and the concave portion 34. That is, the recessed part 34 is formed in the area | region corresponding to the range of a bearing in the outer surface 6b of the side wall 6. FIG. The convex portion 17 is formed on the side end surface of the seal portion main body 20 with a shape corresponding to the concave portion 34. As described above, the seal body 20 is fixed to the side wall 6 by the bolt B2.

  The recess 34 includes an annular bottom surface 34a, a cylindrical recess-side peripheral wall surface 34b rising from the bottom surface 34a, and an annular outer end region 34c that is an outer peripheral portion of the recess-side peripheral wall surface 34b on the outer surface 6b of the side wall 6. Is provided. The protrusion 17 includes an annular protrusion-side projecting surface 17a that closely contacts the bottom surface 34a, an outer peripheral surface 17b that fits into the recess-side peripheral wall surface 34b, and an annular end surface 17c that closely contacts the outer end region 34c. With. In the third seal mechanism 33, the protrusion-side protruding surface 17a is in close contact with the bottom surface 34a, the outer peripheral surface 17b is closely fitted in the recess-side peripheral wall surface 34b, and the end surface 17c is densely in the outer end region 34c. It works by abutting.

  The first seal mechanism portion 31 is disposed along the longitudinal direction of the end side portion of the drive shaft 8, and the molten resin leaked from the penetrating portion of the drive shaft 8 in the side wall 6 to the outside of the pump body 2 is supplied to the drive shaft 8. It is comprised so that it may push back to the inner side of the pump main body 2 with rotation. The first seal mechanism 31 is a shaft seal, and in this case, a visco seal 35 is used. The visco seal 35 is a spiral groove formed on the inner peripheral surface of the inner member 21. The groove is formed in a spiral in the direction opposite to the rotation direction of the drive shaft 8.

  The groove width (direction along the axial center direction) of the visco seal 35 is set to 3.0 mm, and the groove depth (direction along the radial direction of the drive shaft 8) is set to 1.0 mm. The number of grooves is set to 2 (the number corresponding to 2 threads).

  The first seal mechanism unit 31 includes a sealing groove 36. The sealing groove 36 is an annular groove formed on the inner peripheral surface of the inner member 21. The sealing groove 36 is formed in the vicinity of the packing 25 and on the inner side in the axial center direction with respect to the packing 25. In other words, the sealing groove 36 is disposed so as to be displaced outward in the axial direction away from the clearance of the penetrating portion of the shaft body (in this case, the drive shaft 8) in the side wall 6 of the pump body 2, and in the axial direction. It is provided so that the outer periphery of the end side part 9 may be covered in the direction orthogonal.

  The width of the sealing groove 36 is set to 6.0 mm. That is, the width of the groove of the visco seal 35 is double. The depth of the sealing groove 36 is 1.0 mm. The sealing groove 36 is formed continuously (in communication) with the spiral groove constituting the Bisco seal 35. The visco seal 35 extends from the sealing groove 36 to the inner end of the inner member 21 in the substantially axial direction. In other words, the visco seal 35 extends from the sealing groove 36 to a region corresponding to the convex portion 17 and extends to a through portion of the drive shaft 8 in the side wall 6.

  As shown in FIGS. 3 and 4, the second seal mechanism 32 has a structure that cools the molten resin using a cooling medium 37. Cooling water is used as the cooling medium 37. The second seal mechanism portion 32 is a cooling region portion formed in the outer member 22, and the cooling region portion includes an annular groove 38 formed in the inner peripheral surface of the outer member 22, and a cooling medium 37 in the annular groove 38. And a discharge port portion 40 for discharging the cooling medium 37 whose temperature has been raised by cooling from the annular groove 38. Both the supply port portion 39 and the discharge port portion 40 are formed along the radial direction of the fin portion 27 so as to communicate with the annular groove 38.

  The annular groove 38 is disposed on the outer side in the axial direction on the inner peripheral surface of the outer member 22. The annular groove 38 extends from the position corresponding to the axially inner end surface of the flange portion 24 toward the axially inner side to the middle of the outer member 22 reaching the axially inner end surface. That is, the inner end surface in the axial direction of the annular groove 38 does not reach the position corresponding to the convex portion 17, and is displaced from the penetrating portion on the outer side in the axial direction of the drive shaft 8. The annular groove 38 includes the entire sealing groove 36 on the outer side in the radial direction of the sealing groove 36. The annular groove 38 is positioned approximately half in the direction along the axial direction of the Bisco seal 35 on the outer side in the radial direction of the groove of the Bisco seal 35. Has been extended.

  The axially outer end surface of the annular groove 38 is formed using the axially inner end surface of the flange portion 24. In other words, a part of the axially outer end surface of the annular groove 38 is the axially inner end surface of the flange 24. The annular groove 38 is set to a length approximately half of the length along the axial center direction of the visco seal 35. Specifically, in this embodiment, the length along the axial direction of the annular groove 38 is set to 35 mm.

  The seal portion 4 as described above is provided on the outside of the seal portion main body 20 by using the end side portions 9 and 10 of the drive shaft 8.

  In the manufacturing facility including the gear pump 1 having the above-described configuration, the molten resin passes through the connecting path from the upstream side extruder and is sent from the resin intake port 11 of the gear pump 1 to the flow path 13 in the pump main body 2. It is sent from the resin discharge port 12 to the downstream side extruder by driving.

  Specifically, the driving of the gear pump 1 means that when the drive motor is driven, the driving force is transmitted to the speed reducer, and the driving force is transmitted from the speed reducer to the drive shaft 8 so that the drive shaft 8 is rotated around its axis. Means to rotate. When the drive shaft 8 rotates, the drive gear 14 rotates, and the driven shaft 16 rotates along with the driven gear 15 meshed with the drive gear 14. The molten resin sent into the flow path from the resin intake port 11 is sent from the flow path 13 to the resin discharge port 12 and the downstream side extruder by the rotation of the meshing portion of the drive gear 14 and the driven gear 15.

  Depending on the pressure received, the molten resin may leak out of the pump body 2 from the gaps in the through portions of the drive shaft 8 in the side walls 6 and 7 of the pump body 2. In such a case, the first seal mechanism portion 31, the second seal mechanism portion 32, and the third seal mechanism portion 33 function to prevent the molten resin from leaking to the outside.

  That is, in the third seal mechanism portion 33, the convex portion-side protruding surface 17a is in close contact with the bottom surface 34a, the outer peripheral surface 17b is fitted into the concave portion-side peripheral wall surface 34b, and the end surface 17c is densely in the outer end region 34c. By coming into contact with the pump body 2, it is possible to prevent the pump body 2 from leaking to the outside from the gap between the penetrating portions of the drive shaft 8 in the side walls 6 and 7 of the pump body 2.

  When the molten resin is sent from the flow path 13 to the resin discharge port 12 and the downstream side extruder, the drive shaft 8 rotates around the axis, and the end side portions 9 and 10 of the drive shaft 8 also rotate. It rotates around the axis. And the visco seal 35 which is the 1st seal | sticker mechanism part 31 is arrange | positioned on the outer periphery of the end side parts 9 and 10. FIG. The groove of the visco seal 35 is formed in a spiral in the direction opposite to the rotation direction of the drive shaft 8. For this reason, the molten resin that has entered between the end side portions 9 and 10 and the inner member 21 from the gaps in the through portions of the drive shaft 8 in the side walls 6 and 7 without being suppressed by the third seal mechanism portion 33 is the side wall 6. , 7 is pushed back toward the gap of the through portion of the drive shaft 8.

  That is, sealing is performed by the first seal mechanism 31 (visco seal 35). Further, the first seal mechanism 31 includes a sealing groove 36, and the sealing groove 36 is formed continuously with the spiral groove constituting the Bisco seal 35. For this reason, the molten resin that could not be suppressed by the visco seal 35 is suppressed by the sealing groove 36.

  In relation to such a configuration of the first seal mechanism portion 31, the axially inner end surface of the second seal mechanism portion 32 (annular groove 38) does not reach the position corresponding to the convex portion 17, and the through portion The annular groove 38 includes the entire sealing groove 36. The annular groove 38 is displaced to the outside in the axial direction of the drive shaft 8. Therefore, the second sealing mechanism portion 32 is a portion that cools the molten resin using the cooling medium 37, but the molten resin that has entered between the end side portions 9 and 10 and the inner member 21 is caused by the second sealing mechanism portion 32. It is not cooled rapidly. In other words, the molten resin that has entered between the end side portions 9 and 10 and the inner member 21 can easily maintain fluidity up to a region corresponding to the second seal mechanism portion 32.

  When the molten resin that has entered between the end side portions 9 and 10 and the inner member 21 is rapidly solidified, the pushing back force by the first seal mechanism portion 31 is reduced. However, if the molten resin maintains fluidity, the sealing property (force to push the molten resin back by the molten resin) can be ensured by the fluidity.

  If the molten resin reaches the region corresponding to the second seal mechanism portion 32, the molten resin is cooled by the cooling medium 37 via the inner member 21 by the cooling medium 37 supplied from the supply port 39 to the annular groove 38. It is cooled and solidified on the axially outer side of the drive shaft 8 (end side portions 9 and 10). If the molten resin is solidified, the molten resin can be further prevented from moving outward in the axial direction of the drive shaft 8 (end side portions 9 and 10). In addition, the second seal mechanism portion 32 includes an annular groove 38, and this annular groove 38 is in a region corresponding to the entire sealing groove 36 on the outer side in the radial direction of the sealing groove 36. The molten resin is cooled, solidified, and sealed.

  As described above, in the gear pump 1 according to the present embodiment, the leakage of the molten resin to the outside of the pump body 2 can be reliably suppressed by the three seal mechanism portions. The molten resin contains a foaming agent (gas). However, if the foaming agent passes through the annular groove 38 and the shaft center of the drive shaft 8 (end side portions 9 and 10) is temporarily provided. In the case of reaching the outer side in the direction, the foaming agent is sealed by the packing 25 and can be prevented from leaking outside.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, the sealing groove 36 is described as an example in which the sealing groove 36 is formed continuously with the spiral groove constituting the Bisco seal 35. However, the sealing groove 36 may be an independent groove with respect to the spiral groove constituting the Bisco seal 35.

  In the above embodiment, an example in which the width of the groove of the Bisco seal 35 is set to 3.0 mm, the depth of the groove is set to 1.0 mm, and the number of grooves is set to 2 has been described. . However, the present invention is not limited to this, the groove width of the Bisco seal 35 is set in the range of 2.5 to 3.5 mm, and the groove depth is set to 1.0 to 1.5 mm. The number of grooves may be three in addition to two.

  In the above embodiment, the first seal mechanism 31 is provided with the visco seal 35. However, the seal is not limited to the visco seal 35 as long as the molten resin can be pushed back with the rotation of the shaft body (drive shaft 8), and a labyrinth seal or the like can be used as an alternative to the visco seal 35.

  In the said embodiment, the gear pump 1 was demonstrated as an example of a resin delivery pump. However, the present invention is not limited to the gear pump 1, and the molten resin is sent from one side to the other side by rotating a pair of rotation sending parts rotating around the shaft body around the shaft center, and the molten resin is rotated and sent out. Any resin delivery pump that may leak out of the pump body 2 along the shaft body of the portion can be applied.

  In the said embodiment, it demonstrated by the example in case molten resin leaks along the drive shaft 8 as a shaft body. However, when the driven shaft 16 is also configured to protrude from the side walls 6 and 7 of the pump body 2, the driven shaft 16 can also be provided with first to third seal mechanism portions.

  In the said embodiment, the gear pump 1 showed the example arrange | positioned in the connection path which connects a flow side extruder and a downstream side extruder in communication. However, the gear pump 1 is not limited to being arranged in a connecting path that connects the flow side extruder and the downstream side extruder in a communication manner as long as the gear pump 1 is an apparatus or equipment that sends molten resin from one side to the other side. Absent.

  DESCRIPTION OF SYMBOLS 1 ... Gear pump, 2 ... Pump main body, 3 ... Rotation delivery part, 4 ... Seal part, 5 ... Interior box, 6, 7 ... Side wall, 8 ... Drive shaft, 11 ... Resin intake port, 12 ... Resin discharge port, DESCRIPTION OF SYMBOLS 13 ... Flow path, 14 ... Drive gear, 15 ... Driven gear, 16 ... Driven shaft, 17 ... Convex part, 20 ... Seal part main body, 21 ... Inner member, 22 ... Outer member, 25 ... Packing, 26 ... Fitting part 29 ... Enlarged fitting region, 30 ... Press ring, 31 ... First seal mechanism, 32 ... Second seal mechanism, 33 ... Third seal mechanism, 34 ... Recess, 35 ... Bisco seal, 36 ... Seal Stop groove, 38 ... annular groove, 39 ... supply port, 40 ... discharge port

Claims (2)

A flow path for sending molten resin melted by heating from one side to the other side inside the pump main body, and a pair of rotation sending parts that rotate around different shaft bodies in the flow path At least one of the shaft bodies includes an end side portion that extends through the side wall of the pump main body and extends to the outside of the pump main body, and is sent into the pump main body to be connected to the shaft body on the side wall of the pump main body. A seal portion for sealing the molten resin leaking out of the pump body from the penetrating portion is disposed outside the pump body, and the seal portion includes a first seal mechanism portion and a second seal mechanism portion,
The first seal mechanism portion is arranged along the longitudinal direction of the end side portion of the shaft body, and is configured to push back the leaked molten resin to the inside of the pump body as the shaft body rotates. ,
The second seal mechanism portion is disposed so as to cover an outer peripheral portion of the first seal mechanism portion, and includes a cooling region portion that holds a refrigerant for cooling the leaked molten resin, and the cooling region The resin delivery pump is characterized in that the portion is displaced with respect to the penetrating portion outward in the axial direction of the shaft body.   The resin delivery pump according to claim 1, wherein a visco seal is used as the first seal portion.

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