JP5582221B2 - Manufacturing method of jet pump - Google Patents

Description

  The present invention relates to a method for manufacturing a jet pump.

  2. Description of the Related Art Conventionally, there is known a jet pump that discharges a fluid sucked into a suction pipe by ejecting a pressurized fluid from a nozzle from the discharge pipe.

  For example, in the jet pump disclosed in Patent Document 1, a coupling portion is formed by coupling the downstream end portion of the suction pipe and the upstream end portion of the discharge pipe, and a nozzle extending along the axial direction of the discharge pipe is connected to the nozzle. It opens to the upstream end of the discharge pipe. In such a configuration, a negative pressure is generated in the coupling portion by the ejection of the fluid from the nozzle, whereby the fluid is sucked from the upstream end portion of the suction pipe, and the suction fluid is sucked from the downstream end portion of the discharge pipe. It will be discharged.

JP-A-61-65067

  Now, in the jet pump disclosed in Patent Document 1, a throttle portion is provided in a portion of the discharge pipe downstream of the coupling portion. This throttle part has a reduced inner diameter with respect to the upstream end part that forms the coupling part in the discharge pipe, so that a pump function that sucks and discharges fluid by generating a negative pressure in the coupling part can be realized. Yes. At the same time, the inner diameter of the throttle part is reduced with respect to the downstream end on the opposite side of the coupling part in the discharge pipe. It is also possible to increase.

  In order to open the nozzle at the upstream end of the discharge pipe having such a shape, in the jet pump disclosed in Patent Document 1, the discharge pipe, the nozzle, and the suction pipe are separately formed and screwed together. Yes. In this case, since it is necessary to secure the strength by forming the joint portion particularly thickly, the physique of the jet pump becomes large after the joint.

  This invention is made | formed in view of the above problem, The objective is to provide the manufacturing method of the jet pump which balances a high pump function and a small physique.

According to the first aspect of the present invention, there is provided a nozzle that ejects a pressurized fluid, a suction pipe that sucks fluid from an upstream end, and a fluid that is sucked into the suction pipe when the fluid is ejected from the nozzle. As a jet pump in which a discharge pipe that discharges from a downstream end is integrally formed, the downstream end of the suction pipe and the upstream end of the discharge pipe are coupled in the radial direction of the discharge pipe. The nozzle extends along the axial direction of the discharge pipe and opens at the upstream end of the discharge pipe of the joint, and the suction pipe and the discharge pipe are opposite from the end forming the joint. A method of manufacturing a jet pump having a shape in which an inner diameter is enlarged or fixed toward an end of the cavity, and includes a cavity plate that forms a cavity having a shape that complements the outer shape of the jet pump, and a cavity Injection into the cavity using a molding die provided with a first slide core inserted into the part for molding the suction pipe and a second slide core inserted into the part of the cavity for molding the discharge pipe The molten resin is solidified by cooling , and the downstream end portion of the suction pipe and the upstream end portion of the discharge pipe that are eccentrically coupled to each other are formed by the first slide core and the second slide core, respectively. a manner, disconnect after forming a jet pump, when the mold is opened molding die, in the direction from the downstream end of the suction pipe to the upstream end in the molded jet pump, the first slide core The second slide core is extracted in a direction from the upstream end portion of the discharge pipe toward the downstream end portion in the jet pump formed and formed.

According to the first aspect of the present invention, the outlet portion of the coupling portion formed by coupling the downstream end portion of the suction pipe and the upstream end portion of the discharge pipe in the radial direction of the discharge pipe has the diameter. The shape is narrowed in the direction. Therefore, by ejecting the fluid from the nozzle that opens at the upstream end of the discharge pipe in the joint, a negative pressure is generated in the joint, and the suction fluid is drawn from the upstream end of the suction pipe. It can discharge from the downstream edge part of a discharge pipe. At the same time, the discharge pipe has a shape in which the inner diameter is enlarged or fixed from the upstream end portion that forms the coupling portion with the outlet portion constricted toward the downstream end portion on the opposite side. On the side, the diffuser action can be exerted to enhance the pump function. Moreover, with respect to the suction pipe and the discharge pipe having a shape in which the inner diameter is enlarged or fixed from the end portion forming the coupling portion toward the opposite end portion, a simple structure in which the direction toward the opposite end portion is the mold release direction. It is possible to make the joint portion smaller by integrally molding with the molding die. From the above, it is possible to provide a jet pump that achieves both a high pump function and a small physique.
Furthermore, according to the first aspect of the present invention, the downstream end portion of the suction pipe and the upstream end portion of the discharge pipe that are eccentric to each other are coupled in the radial direction of the discharge pipe, thereby narrowing the outlet portion. Thus, the connected portion can be reliably formed. Therefore, it is possible to obtain a high pumping function by ensuring that the negative pressure generating action at the joint and the diffuser action at the downstream side of the joint are firmly demonstrated.

  According to the invention described in claim 2, the nozzle is a method for manufacturing a jet pump having a shape in which the inner diameter is reduced or fixed from the downstream end on the coupling portion side toward the upstream end on the opposite side. The second slide core is inserted into a part of the cavity where the nozzle and the discharge pipe are formed, and after forming the jet pump, when the mold is opened, the upstream side of the nozzle is formed in the formed jet pump. The second slide core is extracted in a direction from the side end portion toward the downstream end portion and in a direction from the upstream end portion of the discharge pipe coaxial with the nozzle toward the downstream end portion. According to this, for the nozzle that extends along the axial direction of the discharge pipe and opens to the upstream end of the discharge pipe in the joint, the upstream end on the opposite side from the downstream end on the joint Since the inner diameter is reduced or fixed toward the part, the die cutting direction can be set in the same direction as that of the discharge pipe. Therefore, it is possible to contribute to the downsizing of the physique by integrally molding the nozzle and the discharge pipe with a molding die having a simple structure in which the mold release direction is the same.

  According to a third aspect of the present invention, the pressure pipe connected to the nozzle for supplying the pressurized fluid to the nozzle is pressurized as a jet pump formed integrally with the nozzle, the suction pipe and the discharge pipe. The pipe is a method for manufacturing a jet pump having a shape in which the inner diameter is enlarged or fixed from the downstream end on the nozzle side toward the upstream end on the opposite side, and a pressurized pipe is formed in the cavity. After the jet pump is molded using a molding die further provided with a third slide core inserted into the portion to be opened, when the molding die is opened, the pressurizing pipe of the molded jet pump is The third slide core is extracted in the direction from the downstream end to the upstream end. According to this, for the pressurized pipe whose inner diameter is enlarged or fixed from the downstream end on the nozzle side serving as the pressurized fluid supply side to the upstream end on the opposite side, to the upstream end. With the molding die whose direction is the die cutting direction, the nozzle, the suction pipe and the discharge pipe can be integrally molded. Therefore, it is possible to obtain a high pumping function by reliably supplying the pressurized fluid to the nozzle while suppressing the increase in size due to the coupling of the pressurized pipe with the nozzle.

1 is a schematic configuration diagram illustrating a fuel supply device to which a jet pump according to a first embodiment of the present invention is applied. It is sectional drawing which shows the jet pump by 1st embodiment of this invention. It is the III-III sectional view taken on the line of FIG. It is sectional drawing which shows the shaping die used for manufacture of the jet pump by 1st embodiment of this invention. It is a cross-sectional schematic diagram for demonstrating the manufacturing method of the jet pump by 1st embodiment of this invention. It is sectional drawing which shows the jet pump by 2nd embodiment of this invention. It is the VII-VII sectional view taken on the line of FIG. It is a cross-sectional schematic diagram for demonstrating the manufacturing method of the jet pump by 2nd embodiment of this invention. It is sectional drawing which shows the jet pump by the modification of 1st embodiment of this invention.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment.

(First embodiment)
FIG. 1 shows a fuel supply apparatus 10 to which a jet pump 1 according to a first embodiment of the present invention is applied. The fuel supply device 10 is a device for supplying fuel as “fluid” to an internal combustion engine (engine) 2 in a vehicle, and is mounted on a fuel tank 3 that stores the supplied fuel. Here, the fuel tank 3 of the present embodiment has a structure in which recesses 3a and 3b are formed on both sides of the drive shaft 4 of the vehicle, respectively, and the fuel supply device 10 is inserted above the one recess 3a. The opening 3c is formed.

  The fuel supply device 10 includes a flange 11, a reservoir cup 12, a suction filter 13, a fuel pump 14, a high pressure filter 15, a flexible pipe 16, a pressure regulator 17, a transfer pipe 18, a suction filter 19, the jet pump 1, and the like. .

  The flange 11 is attached to the opening 3 c as a lid member that covers the opening 3 c of the fuel tank 3. A fuel supply pipe 5 that supplies fuel to the internal combustion engine 2 outside the fuel tank 3 is connected to the flange 11. The bottomed cylindrical reservoir cup 12 is disposed below the flange 11 as a sub tank accommodated in one recess 3 a of the fuel tank 3. The reservoir cup 12 accommodates most of the components 13 to 15, 17, 1 of the fuel supply device 10 inside. The reservoir cup 12 is formed with a through hole (not shown) penetrating the inner and outer walls, and the fuel in the fuel tank 3 can flow through the through hole.

  The suction filter 13 is connected to the fuel inlet of the fuel pump 14 and filters the fuel drawn from the reservoir cup 12 by the pump 14. The fuel pump 14 is disposed such that the fuel discharge port 14a faces upward. The fuel pump 14 draws in the fuel that has passed through the suction filter 13 by using the rotational driving force of the built-in motor, further pressurizes it, and discharges it from the fuel discharge port 14a. The high pressure filter 15 is connected to the fuel discharge port 14a of the fuel pump 14, and filters the pressurized fuel discharged from the discharge port 14a. A fuel supply pipe 5 is connected to the high-pressure filter 15 via a bellows-like flexible pipe 16 and a flange 11, and clean fuel that has passed through the filter 15 is supplied to the internal combustion engine 2. . Further, a pressure regulator 17 is connected to the high pressure filter 15, and the pressure of the fuel supplied to the internal combustion engine 2 is adjusted by the regulator 17. The surplus fuel due to this pressure adjustment is discharged from the fuel discharge port 17a of the pressure regulator 17 in a state of being pressurized from the atmospheric pressure.

  The transfer pipe 18 is disposed across the recesses 3a and 3b of the fuel tank 3, and connects between the suction filter 19 on the recess 3b side and the jet pump 1 on the recess 3a side. The suction filter 19 is connected to the upstream end 18 a of the transfer pipe 18, and filters the fuel sucked into the jet pump 1 from the recess 3 b through the pipe 18.

  The jet pump 1 accommodated inside the reservoir cup 12 on the recess 3 a side of the fuel tank 3 is connected to the downstream end 18 b of the transfer pipe 18 and can suck the fuel remaining in the recess 3 b of the tank 3. It has become. At the same time, the jet pump 1 is connected to the fuel discharge port 17 a of the pressure regulator 17, so that excess pressurized fuel is supplied by adjusting the pressure of the fuel supplied to the internal combustion engine 2. The jet pump 1 sucks the residual fuel in the recess 3 b of the fuel tank 3 and discharges it into the reservoir cup 12 by a pump function using the pressurized fuel supplied from the pressure regulator 17.

  Here, FIG. 2 shows the configuration of the jet pump 1 according to the first embodiment of the present invention in detail. The jet pump 1 is formed by integrally molding a pressure pipe 100, a nozzle 110, a suction pipe 120, and a discharge pipe 130 with a resin material.

  Specifically, the pressurized pipe 100 is formed in a cylindrical shape, and has a connection portion 102 connected to the fuel discharge port 17a of the pressure regulator 17 at one end portion 100a. The pressurized pipe 100 circulates the pressurized fuel toward the other end portion 100b connected to the nozzle 110 by receiving the pressurized fuel from the pressure regulator 17 at the one end portion 100a. Here, in particular, in the present embodiment, the inner diameter of the pressure pipe 100 increases from the downstream end 100b on the nozzle 110 side toward the upstream end 100a.

  The nozzle 110 is formed in a cylindrical shape extending along the radial direction of the pressure pipe 100 (the vertical direction in FIG. 2), and the one end 110 a in the radial direction with respect to the downstream end 100 b of the pressure pipe 100. Are combined. That is, the nozzle 110 is coupled to the pressure pipe 100 substantially vertically. The inner diameter of the nozzle 110 whose one end 110a opens with respect to the downstream end 100b of the pressure pipe 100 is set to be smaller than the inner diameter of the downstream end 100b over the entire axial direction. As a result, the nozzle 110 ejects the pressurized fuel supplied to the one end 110 a through the pressurized pipe 100 from the other end 110 b coupled to the discharge pipe 130. Here, in particular, in the present embodiment, the inner diameter of the nozzle 110 is reduced in a range smaller than the inner diameter of the pressure pipe 100 from the downstream end 110b on the discharge pipe 130 side toward the upstream end 110a. Yes.

  The suction pipe 120 is formed in a cylindrical shape extending along the radial direction (the vertical direction in FIG. 2) of the pressure pipe 100, and the intermediate portion 120 c is coupled to the downstream end portion 100 b of the pressure pipe 100. Yes. That is, the suction pipe 120 is coupled to the pressure pipe 100 substantially perpendicularly. The suction pipe 120 in which the intermediate part 120c is isolated from the downstream end part 100b of the pressure pipe 100 has a connection part 122 connected to the downstream end part 18b of the transfer pipe 18 at one end part 120a. . As a result, the suction pipe 120 sucks the residual fuel in the recess 3 a of the fuel tank 3 from the one end 120 a through the transfer pipe 18 and circulates it to the other end 120 b connected to the discharge pipe 130. Here, in particular, in the present embodiment, the inner diameter of the suction pipe 120 increases from the downstream end 120b on the discharge pipe 130 side toward the upstream end 120a.

  The discharge pipe 130 is formed in a cylindrical shape extending along the axial direction of the suction pipe 120 (vertical direction in FIG. 2), and the one end 130 a is connected to the pipes 130, 120 with respect to the downstream end 120 b of the suction pipe 120. Are connected in the radial direction. That is, the discharge pipe 130 is eccentric in the radial direction with respect to the suction pipe 120 and is coupled substantially in parallel. As shown in FIGS. 2 and 3, the end portions 130a and 120b of the pipes 130 and 120 connected in this way form a connecting portion 140 that opens in the radial direction and communicates with each other. Yes. As a result, the outlet portion 140a formed by the end portion 130a of the discharge pipe 130 in the coupling portion 140 has a flow path area (area of a broken line portion in FIG. The shape is narrowed in the direction.

  A nozzle 110 extending coaxially along the axial direction of the pipe 130 opens a downstream end 110 b at the end 130 a of the discharge pipe 130 in the coupling portion 140. Here, the inner diameter of the discharge pipe 130 is set to be larger than the inner diameter of the downstream end 110b of the nozzle 110 and larger than the inner diameter of the downstream end 120b of the suction pipe 120 over the entire axial direction. ing. Thus, the fuel flows from the coupling portion 140 formed by the one end portion 130a of the discharge pipe 130 toward the other end portion 130b of the discharge pipe 130 that opens inside the reservoir cup 12 (see FIG. 1). . In particular, in the present embodiment, the inner diameter of the discharge pipe 130 is fixed so as to have a predetermined diameter from the upstream end portion 130a on the coupling portion 140 side toward the downstream end portion 130b.

  In the discharge pipe 130 having the above-described configuration, when pressurized fuel is ejected from the nozzle 110 toward the upstream end portion 130a forming the coupling portion 140 in which the outlet portion 140a is narrowed, the periphery of the ejected fuel flow Negative pressure is generated. As a result, in the suction pipe 120 in which the remaining portion of the coupling portion 140 is formed by the end portion 120b, a differential pressure is generated between the both end portions 120a and 120b, so that fuel is sucked from the recess 3a of the fuel tank 3 into the coupling portion 140. Will be. Further, the intake fuel to the coupling portion 140 where the negative pressure is generated is diffused into the pipe 130 by being guided downstream of the outlet portion 140a of the coupling portion 140 in the discharge pipe 130. As a result, the diffuser action is exerted, and the velocity energy of the fuel flow is converted into the pressure energy of the fuel flow, so that the fuel flows from the downstream end portion 130b of the discharge pipe 130 to the reservoir cup 12 while increasing the pressure. Will be discharged. Therefore, according to the jet pump 1 of this embodiment, a high pump function is obtained.

  FIG. 4 shows a molding die 1000 used for manufacturing the jet pump 1 according to the first embodiment of the present invention. The molding die 1000 includes cavity plates 1001 and 1002 and slide cores 1006 to 1008.

  Specifically, the cavity plates 1001 and 1002 having the paper surface of FIG. 4 as the mold dividing surface form a cavity 1009 having a shape that complements the outer shape of the jet pump 1 in the mold-clamped state. The slide core 1006 is inserted into a portion 1009 a of the cavity 1009 that molds the pressurized pipe 100. The slide core 1007 is inserted into a portion 1009b of the cavity 1009 where the nozzle 110 and the discharge pipe 130 are formed. Furthermore, the slide core 1008 is inserted into a portion 1009c of the cavity 1009 where the suction pipe 120 is formed.

  In order to manufacture the jet pump 1 using the molding die 1000 having such a configuration, first, the cavity plates 1001 and 1002 are closed to form the cavity 1009, and the slide cores 1006 to 1008 are formed at predetermined positions of the cavity 1009. Insert. Subsequently, the molding die 1000 is clamped and molten resin is injected into the cavity 1009. Thereafter, the molten resin is solidified by cooling in the cavity 1009, whereby the elements 100, 110, 120, and 130 of the jet pump 1 are integrally formed as shown in FIG.

  Finally, the slide cores 1006 to 1008 are extracted in the direction of the white arrow in FIG. 5 and the cavity plates 1001 and 1002 are opened to separate the resin molded product of the jet pump 1 from the molding die 1000. Mold. At this time, the slide core 1006 can be pulled out in the direction from the end portion 100b of the pressurized pipe 100 toward the end portion 110a on the large inner diameter side. The slide core 1007 is extracted from the end 110a of the nozzle 110 in the direction from the end 110b on the large inner diameter side to the end 110b of the straight tubular discharge pipe 130 that is coaxial with the nozzle 110 and has a small inner diameter. This is possible in the direction from the portion 130a to the end portion 130b. Furthermore, the slide core 1008 can be pulled out in the direction from the end 120b of the suction pipe 120 toward the end 120a on the large inner diameter side. Thus, according to the molding die 1000 in which the die-cutting direction of the slide cores 1006 to 1008 is set, each element 100, 110, 120, 130 can be simultaneously molded without occurrence of undercut to form a small joint between them.

  As described above, according to the jet pump 1 of the first embodiment, both a high pump function and a small physique can be achieved.

(Second embodiment)
As shown in FIG. 6, the jet pump 21 according to the second embodiment of the present invention is a modification of the first embodiment. In the jet pump 21 of the second embodiment, the suction pipe 220 has a cylindrical shape extending along the radial direction of the discharge pipe 130 (the left-right direction in FIG. 6), and is downstream of the upstream end 130a of the discharge pipe 130. The side end 220b is coupled in the radial direction. That is, the suction pipe 220 and the discharge pipe 130 are coupled so as to intersect substantially vertically. As shown in FIGS. 6 and 7, the end portions 220 b and 130 a of the pipes 220 and 130 joined in this way form a coupling portion 240 that opens in the radial direction of the discharge pipe 130 and communicates with each other. doing. Accordingly, also in the present embodiment, the outlet portion 240a formed by the upstream end portion 130a of the discharge pipe 130 in the coupling portion 240 has a flow passage area (area of a broken line portion in FIG. 6) in a cross section perpendicular to the pipe 130. ) Is narrowed in the radial direction by the pipe 130.

  The downstream end 110b of the nozzle 110 isolated from the downstream end 220b of the suction pipe 220 opens to the upstream end 130a of the discharge pipe 130 that forms the coupling portion 240 together with the end 220b. . Here, the inner diameter of the discharge pipe 130 larger than the inner diameter of the downstream end portion 110b of the nozzle 110 is set to be larger than the inner diameter of the downstream end portion 220b of the suction pipe 220 over the entire axial direction. Accordingly, also in the present embodiment, fuel is sucked into the coupling portion 240 from the upstream end portion 220a of the suction pipe 220 in accordance with the fuel ejection from the nozzle 110, and from the coupling portion 240 to the discharge pipe 130. The fuel flows toward the downstream end portion 130b. In particular, in the present embodiment, the suction pipe 220 is fixed so that the inner diameter of the suction pipe 220 becomes a predetermined diameter from the downstream end 220b on the coupling portion 240 side toward the upstream end 220a.

  With the above configuration, in the discharge pipe 130, when pressurized fuel is ejected from the nozzle 110 toward the upstream end portion 130a that forms the coupling portion 240 with the outlet portion 240a constricted, the periphery of the ejected fuel flow Negative pressure is generated. As a result, in the suction pipe 220 in which the remaining part of the coupling part 240 is formed by the end part 220b, a differential pressure is generated between the two end parts 220a and 220b, so that fuel is sucked from the recess 3a of the fuel tank 3 into the coupling part 240. Will be. Further, the intake fuel to the coupling portion 240 where the negative pressure is generated is diffused into the pipe 130 by being guided to the downstream side of the outlet portion 240 a of the coupling portion 240 in the discharge pipe 130. As a result, the diffuser action is exhibited as in the first embodiment, and the fuel is discharged from the discharge pipe 130 to the reservoir cup 12 with an increase in pressure. Therefore, a high pump function is also achieved in the second embodiment. Is obtained.

  In order to manufacture the jet pump 21 according to the second embodiment, the slide core 2008 for forming the suction pipe 220 in the molding die 2000 of FIG. This is possible in the direction from the end 220a of the pipe 220 toward the end 220b. Further, as is apparent from FIG. 8, the slide cores 1006 and 1007 are extracted in the same manner as in the first embodiment. In this way, according to the molding die 2000 in which the die-cutting direction of the slide cores 2008, 1006, and 1007 is set, each element 220, 100, 110 and 130 can be simultaneously formed without the occurrence of undercut, and their joints can be made smaller.

  From the above description, it is possible to achieve both a high pump function and a small physique by the jet pump 21 of the second embodiment.

(Other embodiments)
A plurality of embodiments of the present invention have been described so far, but the present invention is not construed as being limited to these embodiments, and can be applied to various embodiments without departing from the gist of the present invention. It is.

  Specifically, the jet pumps 1 and 21 of the first and second embodiments may be cast metal products as long as the components are integrally formed.

  As for the pressure pipe 100 of the first and second embodiments, as shown in a modified example in FIG. 9 (this figure is a modified example of the first embodiment), the upstream side from the downstream end 110b on the nozzle 110 side is upstream. The inner diameter may be fixed to a predetermined diameter toward the end portion 110a on the side. Moreover, about the nozzle 110 of 1st and 2nd embodiment, as FIG. 9 shows the modification (the figure is a modification of 1st embodiment), the edge part of the downstream side used as the connection part 140,240 side The inner diameter may be fixed to a predetermined diameter from 110b toward the upstream end 110a. Furthermore, the nozzle 110 of the first and second embodiments is modified in FIG. 9 as long as the nozzle 110 opens to the upstream end portion 130a of the pipe 130 along the axial direction of the discharge pipe 130 (the figure shows the first example). As shown in a modification of the embodiment, the pipe 130 may be eccentric in the radial direction.

  With respect to the suction pipe 120 of the first embodiment, as shown in a modified example in FIG. 9, according to the second embodiment, from the downstream end 120b on the coupling portion 140 side toward the upstream end 120a. The inner diameter may be fixed to a predetermined diameter. Further, in the suction pipe 220 of the second embodiment, the inner diameter may be increased from the downstream end 220b on the coupling portion 240 side toward the upstream end 220a in accordance with the first embodiment. Good. Furthermore, with respect to the discharge pipe 130 of the first and second embodiments, as shown in FIG. 9 as a modification (the modification is a modification of the first embodiment), the upstream side that is the coupling portion 140,240 side is shown. The inner diameter may be increased from the end portion 130a toward the downstream end portion 130b.

  In addition, the jet pumps 1 and 21 of the first and second embodiments described above and the modified examples thereof are not limited to being applied to the fuel supply apparatus 10 that handles fuel as “fluid”. The present invention may be applied to a device that handles a liquid or gas other than fuel.

1,21 Jet pump, 2 Internal combustion engine, 3 Fuel tank, 3a, 3b Recess, 10 Fuel supply device, 12 Reservoir cup, 17 Pressure regulator, 17a Fuel outlet, 18 Transfer pipe, 100 Pressure pipe, 100a Upstream end Part, 100b downstream end, 110 nozzle, 110a upstream end, 110b downstream end, 120, 220 suction pipe, 120a, 220a upstream end, 120b, 220b downstream end, 120c intermediate part, 130 Discharge pipe, 130a upstream end, 130b downstream end, 140, 240 joint, 140a, 240a outlet, 1000, 2000 mold, 1006, 1007, 1008, 2008 slide core, 1009 cavity

Claims (3)

A nozzle that ejects pressurized fluid, a suction pipe that sucks fluid from the upstream end, and a fluid that is sucked into the suction pipe by ejecting fluid from the nozzle is discharged from the downstream end. As a jet pump in which the discharge pipe is integrally formed, the downstream end portion of the suction pipe and the upstream end portion of the discharge pipe are coupled in the radial direction of the discharge pipe to form a coupling portion, The nozzle extends along the axial direction of the discharge pipe and opens at an upstream end of the discharge pipe in the coupling portion, and the suction pipe and the discharge pipe form an end portion forming the coupling portion A method of manufacturing a jet pump having a shape in which an inner diameter is enlarged or fixed toward an opposite end from
A cavity plate that forms a cavity having a shape that complements the outer shape of the jet pump, a first slide core that is inserted into a portion of the cavity that molds the suction pipe, and a discharge pipe that is the cavity. Using a molding die equipped with a second slide core to be inserted into the part,
The molten resin injected into the cavity is solidified by cooling , and the downstream end portion of the suction pipe and the upstream end portion of the discharge pipe that are eccentrically coupled to each other are respectively connected to the first slide core and the second slide core. When the mold is opened after the jet pump is molded by molding with the slide core, the downstream end of the suction pipe is connected to the upstream end of the molded jet pump. The first slide core is withdrawn in the direction toward the end, and the second slide core is withdrawn in the direction from the upstream end to the downstream end of the discharge pipe in the molded jet pump. A method for producing a jet pump, characterized by comprising: The nozzle is a method for manufacturing the jet pump having a shape in which an inner diameter is reduced or fixed from a downstream end on the coupling portion side toward an upstream end on the opposite side,
The second slide core is inserted into a part of the cavity for molding the nozzle and the discharge pipe,
After the jet pump is molded, when the mold is opened, in the molded jet pump, the direction from the upstream end to the downstream end of the nozzle is coaxial with the nozzle. 2. The method of manufacturing a jet pump according to claim 1, wherein the second slide core is extracted in a direction from the upstream end portion to the downstream end portion of the discharge pipe. As the jet pump in which a pressure pipe coupled to the nozzle for supplying pressurized fluid to the nozzle is integrally formed with the nozzle, the suction pipe, and the discharge pipe, the pressure pipe is A method of manufacturing the jet pump having a shape in which the inner diameter is enlarged or fixed from the downstream end on the nozzle side toward the upstream end on the opposite side,
Using the molding die further provided with a third slide core to be inserted into a part of the cavity for molding the pressure pipe,
After the jet pump is molded, when the mold is opened, the third slide is moved in the direction from the downstream end to the upstream end of the pressurized pipe in the molded jet pump. The method for manufacturing a jet pump according to claim 2, wherein the core is extracted.

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