CN113799329B - Liquid outlet section forming die of efficient impeller - Google Patents

Abstract

The invention provides a liquid outlet section forming die of a high-efficiency impeller, which comprises a front die body and a rear die body, wherein a core die comprises a liquid outlet section core die assembly for forming a liquid outlet section of a runner of the impeller to be formed, and blades of the impeller to be formed are twisted blade surfaces; in the scheme, the liquid outlet section core mould assembly for forming the liquid outlet section of the impeller runner to be formed and the liquid inlet section core mould assembly for forming the liquid inlet section of the impeller runner to be formed are combined to form the joint surface parting inside the runner, so that independent demoulding motions of the liquid inlet section core mould assembly and the liquid outlet section core mould assembly can be respectively implemented at the liquid inlet and the liquid outlet of the formed impeller to be formed, the blockage of demoulding displacement of the runner wall including the twisted blade surfaces to the die body is avoided, the efficient impeller with the twisted runner can be injection molded, and the complete impeller can be directly formed.

Description

Liquid outlet section forming die of efficient impeller

Technical Field

The invention relates to a forming die, in particular to a forming die of an impeller of a pump.

Background

The adoption of centrifugal pumps for conveying media is very common in industrial and agricultural production, but the media conveyed in special industries has very strict requirements on the materials and the structures of the components of the pumps. The metal pump made of common materials cannot be used, and the metal pump made of few special materials can be used only marginally, but the plastic pump is a new research and development focus in the industry because of the short service life and high cost without practical use value. In view of the molding characteristics of the plastic pump, the shape design of the impeller is the most troublesome, and among the impellers with three basic structures, the open type and the semi-open type have lower pumping efficiency although the structure is relatively simple, and the closed type structure is the most complex but the efficiency is relatively higher.

In the closed impeller, the blades of the common cylindrical surface are additionally provided with short and relatively straight runners, so that the mold closing and demolding processes of the forming mold are conveniently realized, but the flow guide is too simple, so that the pumping capacity is sacrificed, and the pumping capacity can be properly improved by improving the transfer mode, but more power is required to be consumed. In addition, the pumping capacity of the twisted surface blade is definitely optimal, and the twisted flow passage formed by designing the curved surface shape of the front end cover or/and the rear end cover close to the rotating shaft hole accessory is also difficult to avoid when the twisted surface blade is molded.

Patent document 1 entitled "plastic impeller structure of submersible pump for well and injection molding process thereof" (CN 109519412 a) discloses a plastic impeller and injection molding process thereof, wherein the impeller is processed into two parts and then welded into one body, although the scheme of distributed injection molding and welding molding is adopted, the complex impeller structure is avoided, the conventional cylindrical impeller surface of the impeller blade can be clearly known in fig. 3, the difficulty in mold molding is mainly considered, particularly, the difficulty in demolding is reduced, and the closed impeller of the conventional structure of the cylindrical impeller blade is seen to be processed in the above document 1.

Patent document 2 entitled "centrifugal impeller injection mold" (CN 107457964B) discloses an impeller molding mold for one-shot injection molding, the difficulty of the injection part of which is significantly higher than that of patent document 1, namely "[0024 ] is explicitly described in the specification]The rear disc 11 has a rear disc inner disc face 111,the inner disk surface 111 of the rear disk is a plane shape. The inner disk surface 111 refers to the inner side surface of the rear disk 11 facing the impeller 13—the surface shape of the outer disk surface 112 is not particularly required.

The front disc 12 includes a front inner disc face 121 and a front outer disc face 122,front inner disk surface 121 and front outer disk surface 122 are separated Is not in a curved surface shape,wherein the front inner disc surface 121 refers to the inner side of the front disc 12 facing the impeller 13, and the front outer disc surface 122 refers to the outer side facing away from the impeller 13. The curved surface is generally understood here as meaning that the surface is curved, more specifically in the shape of a downward curve in fig. 2, more precisely inwardly and downwardly, which is advantageous for smoothing the wind flow channel as a whole and thus for improving the wind force. "

The above description shows that the front inner disk surface 121 of the front section of the pumping channel is curved, the rear inner disk surface 111 is flat, and the shape of the cylindrical surface of the blade surface can be basically confirmed by combining fig. 1, 2 and 5 to 10, and the whole of the mold core unit 3 formed by the upper core block 4 and the lower core block 5 is wedge-shaped, and the wedge surfaces on both sides are straight and have no distortion, so that the upper core block 4 has a transverse moving path a of a straight shape, the mold feeding and the mold withdrawing can be realized, and the composite structure formed by the upper core block 4 and the lower core block 5 is the curved surface part of the front section of the front inner disk surface 121 for forming and the mold stripping can be realized.

The above-mentioned solutions, although different, are aimed at forming impellers of substantially the same structure, the pumping capacity of which is not satisfactory in the face of viscous liquid media to be conveyed.

The technical solution disclosed in patent document 2 is that the mold core unit 3 composed of the upper core block 4 and the lower core block 5 directly completes the molding of the entire runner, and the molding of the impeller with the complex runner composed of twisted blades cannot be realized, and the pumping efficiency of the injection molded impeller is naturally low.

Disclosure of Invention

The invention aims to provide a liquid outlet section forming die of a high-efficiency impeller, wherein injection molding blades are liquid outlet section runners of the impeller with twisted blade surfaces.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the utility model provides a high-efficient impeller's play liquid section forming die, includes front mould body and back mould body, its characterized in that:

the core mold comprises a liquid outlet section core mold assembly for molding a liquid outlet section of a runner of an impeller to be molded, and blades of the impeller to be molded are twisted blade surfaces;

the liquid outlet section core mold assembly comprises an inner side surface of a liquid outlet section of an upstream blade, a forming surface of a liquid outlet section inner side surface of a front cover plate A, a liquid outlet section inner side surface of a rear cover plate and an outer side surface of a liquid outlet section of a downstream blade, wherein the forming surfaces are formed to enclose the same flow channel, and the liquid outlet section core mold assembly is displaced along the liquid outlet direction of the liquid outlet section to be demolded.

In the scheme, as the liquid outlet section core mold assembly for forming the liquid outlet section of the impeller runner to be formed is provided, the two core mold assemblies can realize parting of the joint surface in the runner, thus the independent demolding movement of the liquid outlet section core mold assembly can be realized, the blocking of demolding displacement of the runner wall including the twisted blade surfaces to the mold body is avoided, the efficient impeller with the twisted runner can be injection molded, the direct forming of the complete impeller is realized, and the processing efficiency is improved.

Drawings

Fig. 1 and 2 are perspective views of the front end and the rear end of an impeller to be formed in visual directions respectively;

FIG. 3 is a schematic perspective view of the front cover plate hidden; FIG. 4 is a front view of the state shown in FIG. 3; FIG. 5 is a cross-sectional view taken along A-A in FIG. 4;

FIGS. 6a, 6b, 6c are schematic perspective views of the present invention;

FIGS. 7a, 7b and 7c are perspective view of the liquid outlet core mold assembly in three directions of vision, respectively;

fig. 8a, 8b, 8c are partial enlarged views of fig. 7a, 7b, 7c, respectively;

fig. 8d, 8e are partial enlarged views of fig. 7c, 7b, respectively;

figure 8f is a cross-sectional view of a stationary mandrel;

FIG. 9 is a perspective view of the liquid inlet section core die assembly;

FIG. 10 is an exploded perspective view of the inlet section mandrel assembly;

fig. 11 is a schematic perspective view of the liquid outlet section mold and the front cover plate a in a hidden state.

Detailed Description

Fig. 1 to 5 show an impeller to be formed, which is a closed impeller with very outstanding pumping efficiency at present, the impeller to be formed comprises a front cover plate a, a rear cover plate B and blades C, wherein the caliber of a liquid inlet A1 in the middle of the front cover plate a is properly matched with the pumping flow requirement, an inner area B1 of an inner side plate surface around a rotary shaft hole B0 in the middle of the rear cover plate B is in a concave spherical or curved surface shape towards the liquid inlet A1, the inner area B1 is smoothly connected to a plane annular area B2 on the inner side plate surface of the rear cover plate B from inside to outside, the blades C are integrally in a twisted sheet shape, namely, an included angle between a front edge C1 of each blade C and the plane annular area B2 is an acute angle, meanwhile, the tangential direction of a joint part of each blade C and the inner area B1 is almost in a vertical relationship, the vertical relationship between the blades C and the inner area B1 extends to the liquid outlet end of a runner, namely, the included angle between the front edge C1 of each blade C and the plane annular area B2 is smaller than the included angle between the front edge C1 of each blade C and the inner area B1, the inner area B1 can be approximately understood as that the vertical relationship is 90 degrees, namely, the included angle between the front edge C2 of each blade C and the front edge C2 is gradually deformed, and the front edge C2 is in a transition shape. As shown in fig. 1, the liquid inlet of the flow channel can be approximately regarded as distorted from isosceles trapezoid, the two front edges C1 can be regarded as waist lines, the liquid outlet of the flow channel is Zhou Xiangchang rectangular with narrow axial direction, and the liquid outlet of the flow channel is rectangular when the flow channel is unfolded in a plane. The inner side of the front cover plate a omitted in the drawing may be a flat surface or an inclined surface or a curved surface of a proper curvature. The bold arrows in fig. 3 indicate the flow direction of the same flow channel.

For convenience of description of positional relationship and definition, the present specification uses front, rear, inner, outer and other directional limiting terms, such as front, front side, front end, front part and the like, which refer to a front cover plate a and a rear cover plate B of an impeller Y to be formed as a reference frame, that is, refer to a side, one end or a part near or adjacent to the front cover plate a as a front, and conversely refer to a rear, rear side, rear end and rear part, and also refer to a front, rear, inner and outer position defined by an upstream and downstream sequence of a medium flow direction in a flow channel, and axial and radial refer to an axial core direction and a radial direction of the impeller Y to be formed generally as a reference frame.

As shown in fig. 6a, 6b and 6C, the molding system of the efficient impeller according to the present invention includes a front mold body 50 and a rear mold body 70, and the core mold includes a liquid outlet section core mold assembly for molding a liquid outlet section of a flow channel of an impeller Y to be molded, wherein a blade C of the impeller Y to be molded is a twisted blade surface; the core mold is accommodated in the cavity after the front mold body 50 and the rear mold body 70 are assembled, and before the assembly, a core mold assembly of a liquid inlet section and a core mold assembly of a liquid outlet section can be selected to be attached to the front mold body and/or the rear mold body;

the liquid inlet section core mould assembly comprises a liquid inlet section core mould unit group for forming a liquid inlet port A1 part and a liquid inlet section of the same runner, wherein the liquid inlet section core mould unit group is connected with the liquid inlet port A1 part, the liquid inlet section core mould unit group comprises a liquid inlet section first core mould 10 for forming an inner side surface NC of an upstream blade liquid inlet section which surrounds the runner and a liquid inlet section second core mould 20 for forming an outer side surface WC of a downstream blade liquid inlet section which surrounds the runner, the demoulding direction of the liquid inlet section first core mould 10 is integrally consistent with the axial direction of an impeller Y, the demoulding direction of the liquid inlet section second core mould 20 is the reverse direction of liquid inlet, and then the number of the liquid inlet section core mould unit groups is consistent with the number of runners of impellers to be formed along the axial direction of the impeller Y;

the liquid outlet section core mold assembly comprises an inner side surface NC of a liquid outlet section of an upstream blade, a forming surface of a liquid outlet section inner side surface of a front cover plate A, a forming surface of a liquid outlet section inner side surface of a rear cover plate B and an outer side surface WC of a liquid outlet section of a downstream blade, wherein the forming surfaces enclose the same flow channel, and the liquid outlet section core mold assembly is displaced along the liquid outlet direction of the liquid outlet section for demolding.

The core of the scheme is that the runner of the impeller Y to be formed is divided into a liquid inlet section and a liquid outlet section, the general principle of boundary position selection of the two sections is mainly based on the fact that a section with larger torsion degree and bending radian of the blade is the liquid inlet section, the section is the liquid outlet section after the section, the torsion degree and the bending radian of the blade of the liquid outlet section are obviously reduced, and meanwhile, the blade surfaces of the liquid outlet section and the inner side surfaces of the liquid outlet sections of the front cover plate A and the rear cover plate B are basically smooth until the blade at the liquid outlet is perpendicular to the front cover plate A and the rear cover plate B which are parallel to each other. The liquid inlet section core mold assembly and the liquid outlet section core mold assembly are selected and defined in this way, demolding is carried out on the liquid inlet section core mold assembly after mold separation at the liquid inlet port A1, the liquid outlet section core mold assembly is displaced and demolded along the liquid outlet direction of the liquid outlet section, demolding positions are separated, the liquid inlet section with large torsion degree and bending radian of a runner is ensured, meanwhile, the liquid inlet section with large torsion degree and bending radian does not have any obstruction and influence on demolding of the liquid outlet section core mold assembly, direct injection molding of a twisted runner formed by twisted blades is smoothly realized, impellers are efficiently processed and molded, and more importantly, the processed impellers have efficient pumping capacity.

In order to better understand the present invention, the liquid inlet section mold matched with the present invention will be briefly described with reference to fig. 9, 10 and 11.

The liquid inlet section core mould unit groups are correspondingly arranged on the same runner liquid inlet section, the adjacent liquid inlet section core mould unit groups are matched with the adjacent liquid inlet section core mould unit groups at the upstream and downstream, and the liquid inlet section first core mould 10 in the liquid inlet section core mould unit group is used for forming the inner side surface NC of the upstream blade liquid inlet section surrounding the runner; the second core mold 20 of the liquid inlet section is used for forming the outer side leaf surface WC of the liquid inlet section of the downstream blade surrounding the flow passage, the liquid inlet section of the blade is just positioned in front of the second core mold 20 of the liquid inlet section in the axial direction, no matter the torsion degree and the bending degree of the liquid inlet section of the blade are positioned in front of the axial displacement of the second core mold 20 of the liquid inlet section, so that the axial displacement of the second core mold 20 of the liquid inlet section cannot be realized, the first core mold 10 of the liquid inlet section can be directly demolded, only the first core mold 10 of the liquid inlet section, which is positioned at the upstream of the second core mold 20 of the liquid inlet section, needs to be demolded, vacates the space for the upstream displacement of the liquid inlet section, which is positioned at the downstream side, in the circumferential direction, of the second core mold 20, so that the second core mold is avoided from the formed blade, and the demolding operation can be realized by axial displacement.

In order to improve the pumping capacity of the impeller, the length of the runner needs to be prolonged and the flow resistance needs to be reduced, and therefore, the core mould unit group of the liquid inlet section needs to be further optimized.

The third core mold 30 of the liquid inlet section is arranged on the downstream side of the first core mold 10 of the liquid inlet section in a downstream direction, so that the length of the liquid inlet section of the runner can be further prolonged, meanwhile, the liquid inlet section of the blade with larger torsion degree and bending degree is divided into two sections, so that each section is shorter in length, the first core mold 10 of the liquid inlet section and the third core mold 30 of the liquid inlet section are respectively molded, the normal demolding action which can be realized by almost direct axial displacement of the first core mold 10 of the liquid inlet section is ensured, then the third core mold 30 of the liquid inlet section is circumferentially displaced to the occupying position of the first core mold 10 of the original liquid inlet section, and the demolding operation of the third core mold 30 of the liquid inlet section can be realized by axial displacement; since the demolding of the third core mold 30 of the liquid inlet section has been emptied of its upstream space, the demolding of the second core mold 20 of the liquid inlet section does not add new difficulties due to the extension of the molding area of the liquid inlet section and the increase of the degree of torsion and the degree of curvature.

The joint surfaces of the circumferential sides of the first core mold 10, the second core mold 20 and the third core mold 30 are parallel to the axial direction of the impeller Y.

In order to reliably restrict and limit the positional relationship of the core dies in the same unit group and the structural relationship between the upstream and downstream unit groups, the invention provides a circular ring 40, and the concrete scheme is that the liquid inlet section first core die 10, the liquid inlet section second core die 20 or the liquid inlet section first core die 10, the liquid inlet section second core die 20 and the liquid inlet section third core die 30 form a liquid inlet section core die unit group which is arranged along the circular ring 40 and is detachably fixed on the circular ring 40 and extends to one side of the circular ring 40, and the circular ring 40 is arranged at a circular concave table 51 in the middle of the front die body 50 in a plug-in mode.

In the above-mentioned scheme, whether the liquid inlet section core mold unit group is formed by the liquid inlet section first core mold 10 and the liquid inlet section second core mold 20 or the liquid inlet section core mold unit group is formed by the liquid inlet section first core mold 10, the liquid inlet section second core mold 20 and the liquid inlet section third core mold 30, the liquid inlet section core mold unit group can be conveniently constrained and fixed on the circular ring 40, and a detachable connection scheme is adopted, so that after impeller forming, the constraint connection between the circular ring 40 and the liquid inlet section first core mold 10, the liquid inlet section second core mold 20 and the liquid inlet section third core mold 30 can be conveniently released, and each core mold is in a state capable of demolding, see fig. 9 and 10.

As shown in fig. 6a, 6b and 6c, as a preferable scheme, a pipe cavity enclosed by the first core mold 10 of the liquid inlet section, the second core mold 20 of the liquid inlet section, the third core mold 30 of the liquid inlet section and the circular ring 40 is movably sleeved on a rectifying pipe 52 on the front mold body 50, and the rectifying pipe 52 is covered at a muzzle of an injection molding gun 53; the liquid out section core die assembly is disposed on the rear die body 70.

In the above-mentioned scheme, that is, the liquid inlet core mold assembly is arranged on the front mold body 50 and forms a movable sleeving relation with the rectifying tube 52, which is not only beneficial to fixing the liquid inlet core mold assembly, but also convenient to separate from the front mold body 50, that is, the molded impeller containing the liquid inlet core mold assembly is convenient to separate from the front mold body 50 after the injection molding process is completed, and then the liquid inlet core mold assembly and the molded impeller are separated and demoulded.

Referring to fig. 9 and 10, a nip region C12 is formed between the inlet second core mold 20 of the inlet core mold unit group on the upstream side and the inlet first core mold 10 of the inlet core mold unit group on the downstream side, which are adjacent to each other, for molding the inlet of the vane C between the upstream and downstream runners.

As shown in fig. 9 and 10, the cross section of the circular ring 40 is square, the inner ring wall is perpendicular to the two end surfaces and the two end surfaces are perpendicular to the ring core line, the outer sides of one ends of the first core 10, the second core 20 and the third core 30 are provided with step parts which are in close spacing fit with the end surface 42 on one side of the circular ring 40 and the inner ring wall 43, and connecting screws 44 are arranged at connecting holes penetrating through the two end surfaces on the circular ring 40 and are connected with threaded holes 12 and 32 on the table surfaces of the first core 10 and the third core 30.

As shown in fig. 6, 7 and 8, the liquid outlet section core mold assembly includes a liquid outlet section core mold unit group 60, the liquid outlet section core mold unit group 60 includes a liquid outlet section core mold unit body 61, a fixed core mold 62 and a movable core mold 63 are provided at the inner end in the radial direction of the liquid outlet section core mold unit body 61, the axial end surfaces of the fixed core mold 62 and the movable core mold 63 are in fit engagement with each other, the rear plate surface of the fixed core mold 62 in the fit engagement state is a fixed core mold rear cover plate molding surface 621 of the inner side surface of the molded rear cover plate B, the front plate surface of the movable core mold 63 in the fit engagement state is a movable core mold front cover plate molding surface 631 of the inner side surface of the molded front cover plate a, and the side surface formed by the assembly of the fixed core mold 62 and the movable core mold 63 in the fit engagement state is the inner side surface NC of the liquid outlet section of the upstream blade and the molding surface WC of the outer side surface of the liquid outlet section of the downstream blade.

In view of the fact that the runner wall of the inner section of the runner liquid outlet section also has a certain torsion degree, a torsion curve of a curvature degree and a curvature curve, the forming core mould of the runner liquid outlet section is divided into an assembly formed by a fixed core mould 62 and a movable core mould 63, the fixed core mould 62 is fixed on the liquid outlet section core mould unit body 61, the movable core mould 63 and the fixed core mould 62 form a movable fit relationship, during demoulding, the liquid outlet section core mould unit body 61 is firstly moved to drive the fixed core mould 62 to move outside the demoulding, then the movable core mould 63 is taken out, and the movable core mould 63 can be properly displaced towards the side of the back cover plate B in the axial direction, and can avoid the blocking of the front cover plate A during demoulding displacement, so that smooth demoulding is realized.

The two sides of the core die unit body 61 of the liquid outlet section are connected to the front section of the guide bar 64, the guide bar 64 and the linear guide rail on the rear die body 70 form a sliding limit fit, the displacement driving mechanism 71 is connected to the outer end of the core die unit body 61 of the liquid outlet section in the radial direction, the driving mechanism 71 is only required to select a displacement mechanism such as an oil cylinder or an air cylinder, and the piston rod 711 of the displacement driving mechanism is connected to the core die unit body 61 of the liquid outlet section.

The rear die body 70 is provided with a linear sliding groove type guide rail, the guide bar 64 and the guide rail form sliding fit, the linear guide rail type guide rail is selected because the movement and driving modes are the simplest, and the ingenious design of the core die of the liquid outlet section can realize demoulding in a linear displacement mode.

As shown in fig. 8, the core module body 61 of the liquid outlet section is a square block, a concave sinking platform 611 is arranged in the core module body, the inner end surface of the sinking platform 611 facing the axial core direction is open, a square protruding block 632 is arranged on the outer side of the movable core module 63, and the protruding block 632 is embedded in the sinking platform 611. The above scheme ensures that when the protruding block 632 is embedded in the sinking platform 611, the driving mechanism drives the liquid outlet section core module unit body 61 to move inwards to perform mould feeding, the movable core module 63 and the fixed core module 62 can be in a stable matching state, and the movable core module 63 is still positioned in the runner during demoulding, and the liquid outlet section core module unit body 61 is outwards displaced and separated from the movable core module 63. The movable core 63 may wait until the molded impeller is removed from the rear mold body 70, and then the movable core 63 may be released by the outward striking or pulling of the protrusions 632 with a tool.

The front mold body 50 has a recess 54, and the front portion of the core mold unit body 61 of the liquid outlet section containing the projection 632 is physically fitted into the recess 54.

This ensures that the position and posture of the core die unit body 61 in the cavity of the liquid outlet section are stable after the front die body 50 and the rear die body 70 are clamped, and the front die body and the rear die body are smoothly separated during die separation.

The inner end surface formed by the fixed core die 62 and the movable core die 63 is in fit with the downstream end of the core die unit group of the liquid inlet section, so that the continuity and smoothness of the flow channel are ensured, and the parting positions of the liquid outlet section and the liquid inlet section of the flow channel are provided with few flash edges and burrs, if any, and the trimming is extremely convenient.

The fixed core 62 comprises a fixed core rear section 622, the front end of the fixed core rear section 622 is connected with a fixed core front section 623, the front end of the fixed core rear section 622 and the rear end joint surface of the fixed core front section 623 are in concave-convex mosaic and movable hinge fit along the demolding direction, and the hinge shaft is parallel to the shaft core direction of the impeller to be molded.

In order to ensure that the length of the liquid outlet section extending in the runner is proper to match the position reached by the downstream end of the core module unit group of the liquid inlet section, the inner section of the liquid outlet section still has a more obvious curved arc shape, namely the curved arc shape of the vane C is still obvious and is accompanied by proper distortion shape, and in order to realize smooth demolding of the fixed core module 62, the invention divides the liquid outlet section into inner and outer sections, namely the fixed core module rear section 622 and the fixed core module front section 623, the runner curved arc degree corresponding to the fixed core module front section 623 is obvious, the fixed core module rear section 622 is pulled out of proper stroke at first during demolding, the concave-convex inlaid part between the fixed core module rear section 622 and the fixed core module front section 623 is separated, and the fixed core module rear section 622 and the fixed core module front section 623 can rotate with each other, so that the interference and the obstruction of the molded vane C are avoided and the detachment displacement is smoothly realized. The hinge shaft has two points, which ensures the rotation between the two points and the relative displacement along the length direction of the runner; and secondly, the connection relationship between the two is ensured, namely, the fixed core front section 623 is ensured to be pulled out together when the fixed core rear section 622 moves outwards, and the fixed core front section is not left in the runner.

As shown in fig. 8f, as a preferred solution, the front end of the rear section 622 of the fixed core mold is provided with a protruding tongue 624, the protruding tongue 624 is provided with a strip hole 625, the joint surface of the rear section of the front section 623 of the fixed core mold is provided with a concave blind hole 626, a hinge shaft 627 is arranged between the side walls of the blind hole 626, the protruding tongue 624 is in embedded fit with the blind hole 626, the hinge shaft 627 is arranged in the strip hole 625 in a penetrating way, and a spring 628 for driving the protruding tongue 624 to be mutually embedded with the blind hole 626 is arranged at the joint position of the rear section 622 of the fixed core mold and the front section 623 of the fixed core mold.

The hinge shaft 627 is arranged in the strip-shaped hole 625 in a penetrating manner, so that the movable hinge connection relation between the rear section 622 of the fixed core die and the front section 623 of the fixed core die is ensured, the embedded fit formed by the protruding tongue 624 and the blind hole 626 is ensured, and the stability of the shape of the fixed core die 622 formed by the rear section 622 of the fixed core die and the front section 623 of the fixed core die during injection molding is ensured, so that a runner meeting the design requirement is formed. The arrangement of the spring 628 is mainly a reset function, that is, the spring 628 provides elastic force to drive the two to be in the embedded matching state, so that the phenomenon of random swinging of the front section 623 of the fixed core die is avoided.

The injection molding machine is generally arranged horizontally, the surfaces of the guide bars 64 connected with the two sides of the core mold unit body 61 of the liquid outlet section are plumb surfaces, when the displacement direction of a core mold unit body 61 of a certain liquid outlet section is plumb direction and the core mold unit body 61 of the liquid outlet section is at the highest position, the phenomenon of sliding separation between the protruding block 632 and the sinking platform 611 is likely to occur, and in order to avoid the occurrence of the sliding and even separation of the protruding block 632 and the sinking platform 611 during mold feeding, damping fit is formed between the circumferential side surfaces of the protruding block 632 and the sinking platform 611. Thus, the relative position between the two is ensured to be fixed, the displacement in advance in the demolding process of the core mold unit body 61 of the liquid outlet section is ensured, and then the demolding and separating operation of the movable core mold 63 and the impeller is performed. The damping fit scheme is various, and a transition fit mode can be adopted, and limit concave parts can also be arranged on two sides of the convex blocks 632 to be matched with the spring top beads arranged on the sinking platform 611.

In fig. 11, the liquid inlet section mold is located on the impeller, and the downstream runner area is the molding area of the liquid outlet section molding mold provided by the invention.

Claims (7)

1. The utility model provides a high-efficient impeller's play liquid section forming die, includes front mould body and back mould body, its characterized in that:

the core mold comprises a liquid outlet section core mold assembly for molding a liquid outlet section of a runner of an impeller (Y) to be molded, and blades of the impeller (Y) to be molded are twisted blade surfaces;

the liquid outlet section core mold assembly comprises an inner side surface (NC) of a liquid outlet section of an upstream blade, a forming surface of the inner side surface of the liquid outlet section of a front cover plate A, the inner side surface of the liquid outlet section of a rear cover plate B and the outer side surface (WC) of the liquid outlet section of a downstream blade, wherein the forming surfaces enclose the same flow channel, and the liquid outlet section core mold assembly is displaced along the liquid outlet direction of the liquid outlet section for demolding;

the liquid outlet section core mold assembly comprises a liquid outlet section core mold unit group (60), the liquid outlet section core mold unit group (60) comprises a liquid outlet section core mold unit body (61), a fixed core mold (62) and a movable core mold (63) are arranged at the inner end of the liquid outlet section core mold unit body (61) in the radial direction, the axial end faces of the fixed core mold (62) and the movable core mold (63) are mutually matched in a fitting mode, the rear plate face of the fixed core mold (62) in a fitting mode is a fixed core mold rear cover plate molding face (621) of the inner side face of a molded rear cover plate B, the front plate face of the movable core mold (63) in a fitting mode is a movable core mold front cover plate molding face (631) of the inner side face of the molded front cover plate A, and the side face formed by a combined piece of the fixed core mold (62) in a fitting mode and the movable core mold (63) is a molding face of the inner side face (NC) of the liquid outlet section of an upstream blade and the outer side face (WC) of the liquid outlet section of the downstream blade;

the fixed core mold (62) comprises a fixed core mold rear section (622), the front end of the fixed core mold rear section (622) is connected with a fixed core mold front section (623), the front end of the fixed core mold rear section (622) and the rear end joint surface of the fixed core mold front section (623) are in concave-convex mosaic and movable hinge fit along the demolding direction, and the hinge shaft is parallel to the shaft core direction of the impeller to be molded.

2. The liquid outlet section forming die of the high-efficiency impeller according to claim 1, wherein: the two sides of the liquid outlet section core mould unit body (61) are connected to the front section of the guide bar (64), the guide bar (64) and the linear guide rail on the rear mould body (70) form sliding limit fit, and the displacement driving mechanism (71) is connected with the outer end of the liquid outlet section core mould unit body (61) in the radial direction.

3. The liquid outlet section forming die of the high-efficiency impeller according to claim 1, wherein: the liquid outlet section core mould unit body (61) is a square block body, a concave sinking table (611) is arranged in the liquid outlet section core mould unit body, the inner end face of the liquid outlet section core mould unit body facing the axial core direction is open, square protruding blocks (632) are arranged on the outer side of the movable core mould (63), and the protruding blocks (632) are embedded in the sinking table (611).

4. A liquid outlet section forming die of a high efficiency impeller according to claim 2 or 3, wherein: the front die body (50) is provided with a concave part (54), and the front entity of the liquid outlet section core die unit body (61) which is provided with the convex block (632) is embedded in the concave part (54).

5. A liquid outlet section forming die of a high efficiency impeller according to claim 2 or 3, wherein: the inner end surface formed by the fixed core mould (62) and the movable core mould (63) is in fit with the downstream end of the core mould unit group of the liquid inlet section.

6. The efficient impeller of claim 4, wherein: the front end of fixed mandrel back end (622) have tongue (624), have bar hole (625) on tongue (624), have concave blind hole (626) on the back end faying surface of fixed mandrel front end (623), set up articulated shaft (627) between the lateral wall of blind hole (626), tongue (624) and blind hole (626) embedded cooperation and articulated shaft (627) wear to arrange in bar hole (625), fixed mandrel back end (622) and fixed mandrel front end (623) faying position department is provided with and drives tongue (624) and blind hole (626) mutually gomphosis spring (628).

7. The efficient impeller of claim 3, wherein the liquid outlet section forming die is characterized in that: the convex blocks (632) and the circumferential side surfaces of the sinking table (611) form damping fit.