JP2007263000A - Pump having resin component and method of manufacturing resin component for pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resinified pump device and a manufacturing method suitable for a resin component for such a pump, for reducing weight, and improving corrosion resistance, by resinifying in a state of being superior in productivity, with sufficient strength, even in a component requiring high strength such as an impeller. <P>SOLUTION: In this manufacturing method of the resin component for the pump device, the resin component for the pump device such as the impeller 4 is made by the manufacturing method comprising a preliminary process (a) of sealing a reinforced fiber material 10 in a mold 11, a resin injection process (b) of sucking and injecting a synthetic resin into the mold 11 in a fluid state by putting the inside of the mold 11 sealed with the reinforced fiber material 10 under negative pressure, and a hardening process (c) of hardening resin injected into the mold 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pump having resin parts such as a water supply pump, a drainage pump, and a vertical shaft pump, and a method for producing a resin part for a pump.

  Conventionally, as materials for various pump parts such as impellers, guide vanes, and pumping pipes, metal materials such as cast iron having high strength are generally used. On the other hand, improvement in handling properties such as carrying of a portable pump and improvement in corrosion resistance have been desired for seawater pumps and chemical pumps. In order to reduce the weight and improve the corrosion resistance of the pump in response to those requests, for example, as disclosed in Patent Document 1, the components of the pump are changed from a metal material to a resin material, that is, converted into a resin. Has been tried.

  In the above-mentioned Patent Document 1, a technique related to resinization of pipe parts such as a pumping pipe focusing on the structure of the flange part is shown, but the resinization of an impeller which is the most severe in the pump is described. Not. Therefore, as shown in FIG. 10, a technique for converting the impeller into a resin is considered.

  FIG. 10 shows a partial cross-sectional view of the impeller 21. Reference numeral 23 denotes a synthetic resin boss that can be externally fitted to the main shaft 22 in an integrally rotated state, and reference numeral 24 denotes a synthetic resin blade that is formed upright from the boss 23. The blade portion 24 is formed at five locations at equal angles in the circumferential direction of the boss portion 23. The boss portion 23 is made of a metal (stainless steel or the like) for engagement with the main shaft 22 by a spline structure or the like, and a cylindrical portion 23A into which the cylindrical hub portion 25 is inserted, and a cylindrical portion 23A for attaching the blade portion 24. The support portion 23B is formed at five locations radially, and the rib portion 23C is formed over the cylindrical portion 23A and the tip side portion of the support portion 23B.

The blade portion 21 includes a base portion 24A that is attached and fixed to the support portion 23B of the boss portion 23, and a blade portion 24B that is erected from the base portion 24A. On the inner diameter side of the base portion 24A, there is formed a stepped engagement portion 24k that is engaged with and engaged with the engaged portion 23k formed on the support portion 23B. The outer diameter side of the support portion 23 </ b> B is relatively fixed by a bolt / nut 26. In other words, the boss portion 23 and the five blade portions 24 are separate parts, and the engagement structure portion 27 and the bolt / nut 26 are combined and integrated so that the boss of the blade portion 24 on which the stress is most exerted is obtained. This is a means for making the base portion with respect to the portion 23 have sufficient strength.
JP 2005-155350 A

  However, since the impeller 21 in the pump is rotated at a high speed while receiving a strong load due to a fluid such as water, in the combined structure of the boss portion 23 and the blade portion 24, the engagement structure portion is used as the use proceeds. There are concerns about wear due to rattling of 27 and a decrease in pump performance and durability due to this, as well as high cost, a large number of assembly steps, and difficulty in increasing productivity, leaving room for further improvement. ing. In addition, resin parts made by the HLU (hand lay-up) method, which is widely used as a conventional resin technology, have relatively low mold costs, but the smooth surface can only be molded on one side. However, there is still room for improvement in terms of poorness, manual work requiring skill, low productivity, and poor working environment.

  The object of the present invention is to provide a resin component that can be made into a resin in a state where the strength is sufficient and the productivity is excellent even for a component requiring high strength such as an impeller, and the weight can be reduced and the corrosion resistance can be improved. The point is to provide a pump device. Another object is to obtain a manufacturing method suitable for such a resin component for a pump.

  According to a first aspect of the present invention, in a pump apparatus having a resin component, molding is performed by injecting a synthetic resin in a flowable state into a molding die encapsulating a preformed reinforcing fiber material and curing it. And at least two front and back surfaces have smooth fiber-reinforced resin parts.

  According to a second aspect of the present invention, in the pump device having a resin component, the flowable synthetic resin is sucked and injected into the mold by making the inside of the mold in which the reinforcing fiber material is enclosed negative pressure. And at least two front and back surfaces molded by curing have smooth fiber reinforced resin parts.

  The invention according to claim 3 is the pump device having the fiber-reinforced resin part according to claim 1 or 2, wherein the resin part is an impeller.

  The invention according to claim 4 is the pump device having the fiber reinforced resin part according to claim 3, wherein the impeller includes a boss portion having a mounting hole for inserting a main shaft, a plurality of blades, and the blades stand up. In the formed state, it is integrated with the boss part, and has an annular wall that serves as a guide surface for guiding the fluid, and the reinforcing reinforcement is included as the reinforcing fiber in a state of straddling the annular wall from the blades. It is characterized by having fibers.

  The invention according to claim 5 is the pump device having the fiber reinforced resin part according to claim 4, wherein the straddle reinforcing fiber, the blade side portion along the surface of the blade, and the root side portion along the outer peripheral surface of the annular wall It is characterized by having.

  The invention according to claim 6 is the pump device having the fiber-reinforced resin part according to claim 1 or 2, wherein the resin part is any one of a guide blade, an impeller chamber, a pumping pipe, a discharge pipe, and a suction pipe. Or more than one.

  The invention according to claim 7 is the pump device having the resin part according to any one of claims 1 to 6, wherein the reinforcing fiber is a glass cloth.

  According to an eighth aspect of the present invention, in the method for manufacturing a fiber reinforced resin part for a pump device, a preliminary process of encapsulating a preformed reinforcing fiber material in a mold and a flowable synthetic resin through the preliminary process. It has a resin injection step of pressure-injecting into a later mold and a curing step of curing the resin injected into the mold.

  According to a ninth aspect of the present invention, there is provided a method for producing a fiber reinforced resin part for a pump device, wherein a preliminary step of encapsulating the reinforcing fiber material in the mold and a negative pressure inside the mold in which the reinforcing fiber material is encapsulated are flowed The method includes a resin injection step of sucking and injecting a synthetic resin in a possible state into the mold, and a curing step of curing the resin injected into the mold.

  According to the present invention, various actions and effects described below can be obtained. The invention of claim 1 is to resinize a pump device component by an RTM method (described later), and the invention of claim 2 is to resinize a pump device component by a light RTM method (described later). According to RTM and LIGHT RTM, there are the following actions (a) to (f). In addition, according to LIGHT RTM, there are the following actions (g) to (ri).

  (B) Compared to metal casting, light work and light equipment are sufficient, and the working environment is also improved. (B) Mold separation (mold separation) after molding is easy. For example, when the part to be molded is an impeller, the stress due to mold separation operation hardly acts on the blade, and dimensional accuracy There is an effect of improving the finishing accuracy of the part surface such as improvement of the surface and no roughness of the blade surface. (C) For example, the HLU method can only provide a smooth surface on one side, but according to RTM and Light RTM, both surfaces can be smooth and have a negative effect on the flow when the front and back surfaces are in contact with each other. Is advantageous. Thereby, the resin component of the pump device can be a fiber reinforced resin component having at least two smooth surfaces. (D) No post-processing (such as grinder processing) required in metal casting is required. (E) The unit price can be made lower than that of metal casting. (F) It is possible to make the fitting tolerance smaller (about ± 0.1 mm) than the conventional resin parts. Since the dimensional accuracy can be improved (about ± 0.2mm) compared to metal castings, the dimensional accuracy of each resin component is increased, and as a result, the performance as a pump device can be substantially improved. Become.

  (G) The thickness of the mold can be reduced, thereby reducing the weight of the mold. Since a large pressure as in the conventional case does not act on the mold, the handling of the mold is simplified and the degree of freedom is high. (H) When compared with the RTM method, the Wright RTM method has an advantage that the number of types that can be used as the reinforcing fiber material is increased, so that the resin component for the pump device can be created flexibly with respect to cost and strength. (I) Since no large pressure acts on the mold, it is possible to make the mold thinner without requiring reinforcement of the steel or the like, and the mold material can also be made of inexpensive resin or wood.

  In the impeller of Claim 4, if it is set as the structure with the straddle reinforcement fiber which has the blade | wing side part along the surface of a blade | wing and the base side part along the outer peripheral surface of an annular wall like Claim 5, in an impeller Since the root part of the blade that requires the most strength can be dramatically increased, the result is that the impeller resin having various advantages such as weight reduction, production efficiency improvement, and corrosion resistance improvement is not strong enough. There is an effect that can be realized without profit. Further, as described in claim 6, the resin component for a pump device having various advantages as described above can be applied to guide vanes, pumping pipes, discharge pipes, suction pipes, etc., and is lighter and less expensive. In addition, it is possible to contribute to the realization of a pump device that improves handling and corrosion resistance, such as being easy to carry.

  Embodiments of a pump having a resin part and a method for producing a resin part for a pump according to the present invention will be described below with reference to the drawings. FIG. 1 is a structural view showing an example of a pump device, FIGS. 2 to 4 are views showing an impeller, FIGS. 5 and 6 are schematic views showing a resin part manufacturing method and manufacturing apparatus by the Light RTM method, FIG. 8 is a block diagram showing the light RTM method and the RTM method, and FIG. 9 is a characteristic comparison table between the RTM method and the light RTM method.

  FIG. 1 shows a vertical-pumped diagonal flow pump (an example of a “pump having a resin part”) P and a drive motor 1 for the pump. The vertical shaft mixed flow pump P includes a pump body 2, an impeller chamber 3, and an impeller 4 that is provided in an integrally rotated state at a lower end of a main shaft 5 that is driven and rotated by a drive motor 1. . A pump body (an example of a pumping pipe) 2 includes a bent pipe 2A, an upper vertical pipe 2B, a lower vertical pipe 2C, and the like, and a main shaft 5 is rotatably supported at the center of the inside thereof.

  The impeller 4 is accommodated in an impeller chamber 3 connected to the lower vertical pipe 2 </ b> C, and the impeller chamber 3 includes a guide vane 6 and a bell mouth (an example of a suction pipe) 7. ing. As shown in FIGS. 2 and 3, the synthetic resin impeller 4 includes a boss portion 4A having a mounting hole 4a that is fitted to the main shaft 5 in an integrally rotated state by a structure or a spline with a key and a key groove. A plurality (five) of blades 4B, a blade 4B integrated with the boss 4A, and a substantially truncated cone-shaped inclined annular wall 4C serving as a guide surface for guiding fluid, and the boss 4A and the inclined annular wall 4C and a plurality of rib walls 4D constructed over 4C.

[Example 1]
Next, a method for manufacturing a resin component for a pump device such as the impeller 4 will be described. The manufacturing method of the resin component according to Example 1 is based on the Light RTM (Light Resin Transfer Molding) method which is a means for creating FRP. Resin parts such as the impeller 4 are molded by sucking and injecting a synthetic resin in a flowable state into the molding die with a negative pressure inside the molding die in which the reinforcing fiber material is sealed. . That is, as shown in FIG. 5 to FIG. 7, the preliminary process a in which the reinforcing fiber material 10 is enclosed in the mold 11 and the inside of the mold 11 in which the reinforcing fiber material 10 is encapsulated are set to a negative pressure. Resin injection step b for sucking and injecting a thermosetting resin in a possible state into the mold 11 and curing to cure the resin injected into the mold 11 by heating the mold 11 into which the resin is injected And a manufacturing method having step c. 5 and 6 are shown as a general method for manufacturing a resin part for the sake of convenience.

  As shown in FIG. 5A, the preliminary step a includes a loading step s for putting the reinforcing fiber material 10 into the lower die 11A, and a lower die in which the reinforcing fiber material 10 is put as shown in FIG. 5B. A mold setting step k for covering the upper mold 11B with 11A. As the reinforcing fiber material 10, materials such as glass fiber, carbon fiber, aramid fiber, or a composite thereof, which do not require a preform with good resin flow, can be used. In FIG. 5, the reinforcing fiber material 10 is drawn as a glass cloth. Further, when the upper mold 11B is set on the lower mold 11A, the mold may be clamped by sucking the flange portion 11f of the mold 11 with a suction device (described later) 12.

  In the resin injection step b, as shown in FIGS. 6 and 7, the inside of the molding die 11 arranged on the floor f is sucked through the suction part 13 and the suction hose 14 provided on the upper die 11 </ b> B. And a pressure reducing step g for reducing pressure by suction, and an injection step t for injecting a mixture of a resin and a curing agent from the molding machine 15 into the mold 11 that has undergone the pressure reducing step g. It is. As synthetic resins, there are various types such as unsaturated polyester resins, vinyl ester resins, phenol resins, and epoxy resins, and pigments, fillers, aluminum hydroxide, and calcium carbonate may be combined as necessary.

  As shown in FIGS. 6 and 7, the curing step c is a state in which the injection step t is completed until it is naturally cured by the action of the curing agent contained in the synthetic resin injected into the mold 11 by negative pressure. It is a process to maintain, and it is good to continue the suction operation by the suction device 12 until the resin is cured. When the resin is cured, the suction device 12 is stopped to stop the suction in the mold 11 and return to atmospheric pressure. Then, the mold 11 is opened and the cured resin part for the pump device (for example, the impeller 4) is taken out.

  The resin parts manufactured by the above-mentioned light RTM method are as follows. ~ 4. It has the following features. 1. Low resin injection pressure. 2. Easy mold clamping. 3. The mold cost is relatively low (for example, about twice the hand lay-up method). There is no need to reinforce the mold with steel. Further, even if the part to be molded is large (large), it can be molded with a very thin mold. 4). Various kinds of reinforcing fibers to be impregnated can be used. A preform like the RTM method is not necessary.

  Moreover, the resin component manufactured by either the light RTM construction method or the RTM construction method has the following characteristics 5-7. 5. Both surfaces are smooth (a fiber-reinforced resin part having at least two front and back surfaces that are smooth). 6). Roughness can be greatly reduced compared to conventional casting pumps. 7). The dimensional accuracy can be improved as compared with a conventional casting pump.

  When the impeller 4 is produced using the light RTM method (or RTM method), it is desirable to insert the reinforcing fiber material 10 as shown in FIG. That is, the reinforcing fiber material 10 used for the impeller 4 includes the straddling reinforcing fiber 10M included in a state of straddling the blade 4B and the inclined annular wall 4C. The straddling reinforcing fiber 10M is bent and impregnated so as to have a blade side portion 16 along the surface 4b of the blade 4B and a root side portion 17 along the outer peripheral surface 4c of the inclined annular wall 4C. Moreover, in the center part between the straddle reinforcement fiber 10M provided corresponding to both surfaces, it is between the substantially straight (planar) flat reinforcement fiber 10H and these straddle reinforcement fiber 10M and flat reinforcement fiber 10H. And a slightly bent semi-strand reinforcing fiber 10J.

  As described above, since the reinforcing fiber material 10 is provided so as to straddle the blade 4B and the inclined annular wall 4C, the strength and rigidity of the base portion of the blade 4B on which the most severe stress acts are greatly improved, and a high output model is achieved. Also endure. In addition, it is possible to realize a resin-made impeller 4 that is not easily damaged by fatigue even when used for a long time and has sufficient durability and reliability. Furthermore, the surface 4b of the blade 4B in contact with the fluid is smooth on both the front and back surfaces, and does not adversely affect the flow. In the above embodiment, the impeller having the inclined annular wall 4C has been described as an example. However, the annular wall may be parallel to the axis.

[Example 2]
Next, a method for manufacturing a resin component according to Example 2 will be described. The second embodiment is based on an RTM (Resin Transfer Molding) method which is a means for creating an FRP. A resin component such as the impeller 4 is molded by pressurizing and curing a flowable synthetic resin into a mold in which a preformed reinforcing fiber material is enclosed. That is, as shown in FIG. 8, a preliminary step y for encapsulating the reinforcing fiber material in the mold and a synthetic resin in a state in which the reinforcing fiber material is allowed to flow under a negative pressure inside the mold are sealed in the mold. And a curing step c for curing the resin injected into the mold.

  It is very similar to the Light RTM method of Example 1, except that the reinforcing fiber material is preformed and that the molten resin is injected by positive pressure (in short, it is pushed in under pressure). The construction method is different in each point. FIG. 9 shows a main feature comparison table between the RTM method and the light RTM method. As can be seen from the comparison table in FIG. 9, the RTM method is slightly inferior to the light RTM method, but the quality by the operator compared to the conventional HLU (hand lay-up) method. There is an advantage that the production efficiency is excellent, the front and back surfaces can be molded into a smooth and clean finished surface, and the dimensional accuracy is good.

[Another Example]
Examples of the resin component for the pump device molded by the manufacturing method (Light RTM method, RTM method) of the first and second embodiments described above include the guide vane 6, the impeller chamber 3, the pump body 2 in addition to the impeller 4 described above. , Discharge tube, bell mouth 7 and the like, but other parts are also possible. Among these parts, both the front and back surfaces are in a liquid contact state, and are particularly suitable for parts such as the guide blade 6 that requires a smooth surface.

Side view of a partially cutout showing a schematic structure of a vertical shaft mixed flow pump (Example 1) Partial front view of impeller Cross section along the axial direction of the impeller Cross-sectional view of the blade root of the impeller It is an action figure showing the principal part of the manufacturing method of the resin parts by a light RTM construction method, (a) is a loading process, (b) is a mold setting process. Schematic showing manufacturing equipment for Light RTM method and some manufacturing processes Block diagram showing the Light RTM method Schematic block diagram showing the RTM method Comparison table showing characteristics of RTM method and Light RTM method Impurity resin configuration diagram of comparative example

Explanation of symbols

2 pumping pipe 4 impeller 4a mounting hole 4b blade surface 4c outer peripheral surface 4A boss 4B blade 4C annular wall 6 guide vane 7 suction pipe 10 reinforcing fiber material 11 molding die 16 blade side portion 17 root side portion a preliminary process b resin Injection process c Curing process j Resin injection process y Preliminary process P Pump device

Claims (9)

  A pump having a fiber-reinforced resin part having at least two smooth surfaces formed by pressurizing and curing a flowable synthetic resin into a mold in which a preformed reinforcing fiber material is sealed and curing apparatus.   A synthetic resin in a flowable state is sucked and injected into the mold by setting the negative pressure in the mold in which the reinforcing fiber material is sealed, and at least two surfaces of the front and back surfaces are smoothed by being cured. Pump device with fiber reinforced resin parts.   The pump device having a fiber-reinforced resin part according to claim 1 or 2, wherein the resin part is an impeller.   The impeller includes a boss portion having a mounting hole for inserting a main shaft, a plurality of blades, and an annular wall serving as a guide surface that guides fluid while being integrated with the boss portion in a state where the blades are formed upright. The pump device having a fiber reinforced resin component according to claim 3, wherein the reinforcing fiber includes a straddling reinforcing fiber included in a state straddling the annular wall from the blade.   The pump device having a fiber-reinforced resin part according to claim 4, wherein the straddling reinforcing fiber has a blade side portion along the surface of the blade and a root side portion along the outer peripheral surface of the annular wall.   The pump apparatus having a fiber-reinforced resin part according to claim 1 or 2, wherein the resin part is applied to any one or more of a guide blade, an impeller chamber, a pumping pipe, a discharge pipe, and a suction pipe.   The pump device having the fiber-reinforced resin component according to any one of claims 1 to 6, wherein the reinforcing fiber is a glass cloth.   A preliminary process for encapsulating the preformed reinforcing fiber material in the mold, a resin injection process for injecting a flowable synthetic resin into the mold after the preliminary process, and an injection into the mold A method for producing a fiber reinforced resin part for a pump device, comprising: a curing step for curing the resin that is used. A preliminary step of enclosing the reinforcing fiber material in the mold, and a resin injection step of sucking and injecting a synthetic resin in a flowable state with a negative pressure inside the mold in which the reinforcing fiber material is encapsulated, A curing step of curing the resin injected into the mold, and a method for producing a fiber reinforced resin part for a pump device.

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