Impeller injection mold

Abstract

The utility model provides a kind of impeller injection mold, including upper die plate, lower die plate, core mould and sliding block;The core mould is located on upper die plate, the sliding block is circumferentially distributed in the periphery of core mould, and the sliding block, core mould, upper die plate and lower die plate constitute the mold cavity of impeller;The sliding block is combined sliding block, and the combined sliding block includes upper layer sliding block and lower layer sliding block, and the lower layer sliding block is movably installed on upper die plate along second direction, and the upper layer sliding block is movably installed on lower layer sliding block along first direction, and the lower layer sliding block is connected with second straight line mechanism, for driving lower layer sliding block to move on upper die plate along second direction;The upper layer sliding block is connected with first straight line mechanism, for driving upper layer sliding block to move on lower layer sliding block along first direction.The utility model solves high negative angle blade demolding damage problem by combined sliding block, greatly improves yield, and moreover prolongs the service life of mould, reduces maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of impeller molds, and in particular to an impeller injection mold. Background Technology

[0002] As the core working component of fluid machinery (such as pumps, compressors, and turbines), the performance of the impeller directly determines the overall efficiency of the machine. Modern high-performance impellers generally employ blades with complex spatial curved surfaces, large torsion angles, and negative angle designs (i.e., the blade profile has a concave area relative to the axis of rotation) to achieve higher aerodynamic / hydraulic efficiency. These impellers are mostly manufactured using engineering plastics (such as PPS, PEEK, and reinforced nylon) through precision injection molding, as they can efficiently reproduce complex geometric features and are cost-effective.

[0003] However, plastic impellers with significant negative angle characteristics face severe challenges in the injection molding demolding process. Traditional mold structures mainly rely on an integral side-mounted slider demolding scheme, where the slider is pulled out as a whole along a single radial direction. For negative angle blades, the slider's movement direction has an excessively large angle with the local normal of the blade surface, resulting in enormous scraping force at the moment of demolding. This not only easily scratches and tears the plastic blades that have not yet fully cooled and solidified (especially in thin-walled areas), causing surface scratches, deformation, or even breakage and scrapping, making it difficult to guarantee the yield rate; the intense mechanical friction also accelerates the wear of the slider's molding surface, significantly shortening the mold life and increasing maintenance costs. More importantly, to avoid interference, the demolding angle is often forced to be increased, resulting in a large slider size, occupying mold space, and limiting multi-cavity layouts and compact designs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides an impeller injection mold that solves the problem of demolding damage to high negative angle blades by using a combined slider, significantly improving the yield rate, extending the service life of the mold, and reducing maintenance costs.

[0005] This utility model achieves the above-mentioned technical objectives through the following technical means.

[0006] An impeller injection mold includes an upper mold plate, a lower mold plate, a core mold, and a slider. The core mold is located on the upper mold plate, and the sliders are circumferentially distributed around the core mold. The sliders, core mold, upper mold plate, and lower mold plate constitute the mold cavity of the impeller. The slider is a combined slider, comprising an upper slider and a lower slider. The lower slider is movably mounted on the upper mold plate along a second direction, and the upper slider is movably mounted on the lower slider along a first direction. The lower slider is connected to a second linear mechanism for driving the lower slider to move along the second direction on the upper mold plate. The upper slider is connected to a first linear mechanism for driving the upper slider to move along the first direction on the lower slider.

[0007] Furthermore, both the first direction and the second direction point to the core mold, and the angle between the first direction and the second direction is an acute angle.

[0008] Furthermore, the angle between the first direction and the second direction is 10 to 25°.

[0009] Furthermore, the upper surface of the lower slider is provided with a first groove, and a first slide rail is installed in the first groove. The bottom of the upper slider is provided with a first slide groove that cooperates with the first slide rail. The first straight-moving mechanism is installed in the first groove of the lower slider. The extension end of the first straight-moving mechanism is connected to the upper slider and drives the upper slider to move along the first slide rail.

[0010] Furthermore, the upper template is provided with a second groove, and a second slide rail is installed in the second groove. The bottom of the lower slider is provided with a second slide groove that cooperates with the second slide rail. The second straight-moving mechanism is installed in the second groove, and the stretching end of the second straight-moving mechanism is connected to the lower slider to drive the lower slider to move along the second slide rail.

[0011] Furthermore, the front ends of both the upper and lower sliders are forming parts, used to form the airfoil of the blades in the impeller mold cavity; the lower surface of the forming part of the upper slider and the upper surface of the forming part of the lower slider are fitted together by a stepped stop.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. The impeller injection mold of this utility model, through a combined slider design, with the upper and lower sliders sliding in different directions, allows the first linear mechanism to drive the upper slider precisely along the direction most conducive to demolding (i.e., the first direction) of the blade's negative angle profile during the first demolding stage. This first direction minimizes the normal angle between the slider's forming surface and the blade's negative angle region, enabling near-interference-free separation at the moment of separation. This completely eliminates the scratching and tensile stress caused by the forced radial extraction of a traditional integral slider. The blade (especially the vulnerable thin-walled negative angle region) experiences only minimal and controllable separation force throughout the demolding process, fundamentally preventing defects such as tearing, scraping, and deformation. This ensures the product's appearance and dimensional integrity, resulting in a significant leap in yield. Therefore, it solves the problem of demolding damage to high negative angle blades and greatly improves the yield rate.

[0014] 2. In the impeller injection mold of this utility model, the lower surface of the upper slider forming part and the upper surface of the lower slider forming part are fitted together by a stepped stop, which is the key to ensuring precision. During the mold closing and injection molding stage, the lower surface of the upper slider forming part and the upper surface of the lower slider forming part are tightly engaged and locked by the precise stepped stop. This eliminates the splicing misalignment and flash problems that are prone to occur in traditional assemblies, ensuring that the combined slider forms a rigid, seamless, high-precision blade cavity wall. At the same time, the dual high-precision guiding system of the first slide rail / groove and the second slide rail / groove (respectively built into the first groove and the second groove) provides an extremely stable and wobbly linear motion reference for the upper and lower sliders in their respective directions of movement. The synergistic effect of the dual rails makes the rigidity and stability of the forming part comparable to that of an integral slider when subjected to the impact of high-pressure melt, ensuring the geometric accuracy requirements of the blade's spatial curved surface.

[0015] 3. The impeller injection mold described in this utility model, through its combined slider design, enables a step-by-step demolding strategy. Specifically, the upper slider first slides along the first direction to release the clamping force, and then the lower slider is pulled out radially along the second direction, solving the problem of the significant resistance encountered during the single-stage demolding of traditional integral sliders. The second-direction movement of the lower slider only occurs after the negative angle clamping force has been largely released, significantly reducing its frictional resistance. The independent drive of the first and second linear mechanisms (preferably hydraulic cylinders or precision servo electric cylinders) ensures that the driving force precisely matches the actual needs of each stage, preventing mechanism overload. These multiple effects significantly reduce the wear rate of key moving parts such as slide rails, grooves, and molding surfaces, multiplying mold durability, extending maintenance intervals, and reducing overall costs. Furthermore, it extends the service life of the combined slider, reducing maintenance costs.

[0016] 4. The impeller injection mold of this utility model precisely controls the angle between the first direction and the second direction to be between 10 and 25°, which can also optimize the mold space utilization. Compared with the traditional solution that requires a large angle (such as >45°) integral slider to avoid negative angles, this utility model minimizes the projection size of the combined slider in the direction perpendicular to the second direction. The structure in which the first slide rail / groove is built into the first groove of the lower slider and the second slide rail / groove is built into the second groove of the upper template further realizes the hidden layout of the drive component and avoids spatial interference. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are some embodiments of this utility model. For those skilled in the art, it is obvious that other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1This is a front view of the mold cavity formed by the combined slider in the impeller injection mold of this utility model (lower template hidden).

[0019] Figure 2 This is a three-dimensional view of the combined slider described in this utility model.

[0020] Figure 3 This is a three-dimensional view of the upper slider described in this utility model.

[0021] Figure 4 This is a three-dimensional view of the lower layer slider described in this utility model.

[0022] Figure 5 This is an assembly diagram of the lower slider and the second slide rail described in this utility model.

[0023] In the picture:

[0024] 1-Upper slider; 1-1-First groove; 2-First rail; 3-Lower slider; 3-1-First groove; 3-2-Second groove; 4-Second rail; 5-Core mold; 6-First cylinder; 7-Second cylinder. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Existing impeller injection molds include an upper mold plate, a lower mold plate, a core mold 5, and sliders. The core mold 5 is located on the upper mold plate, and five sliders are circumferentially distributed around the core mold 5. Each of the five sliders can move radially. The sliders, core mold 5, upper mold plate, and lower mold plate constitute the impeller cavity. This structure is a conventional structure for existing injection molds, and its specific details are not elaborated further. The sliders in this invention are composite sliders, such as... Figure 1 and Figure 2 As shown, the combined slider includes an upper slider 1 and a lower slider 3. The lower slider 3 is movably mounted on the upper template along a second direction, and the upper slider 1 is movably mounted on the lower slider 3 along a first direction. The lower slider 3 is connected to a second linear mechanism for driving it to move along the second direction on the upper template. The upper slider 1 is connected to a first linear mechanism for driving it to move along the first direction on the lower slider 3. Both the first and second directions point to the center of the core mold 5. That is, if the lower slider 3 moves radially along the second direction, the upper slider 1 moves radially along a direction deviating from the second direction by a phase angle. The purpose of this design is that, by using the different sliding directions of the upper slider 1 and the lower slider 3, in the first stage of demolding, the first linear mechanism drives the upper slider 1 to slide precisely along the direction most conducive to demolding (i.e., the first direction) with respect to the negative angle profile of the blade. The first direction minimizes the normal angle between the slider forming surface and the negative angle area of ​​the blade, allowing them to separate almost "without interference" at the moment of separation. This completely eliminates the scratching and tensile stress caused by the forced radial extraction of the traditional integral slider. The blade (especially the fragile thin-walled negative angle area) only bears a very small and controllable separation force throughout the demolding process, fundamentally eliminating defects such as tearing, scraping, and deformation. The product's appearance and dimensional integrity are guaranteed to the fullest extent, resulting in a qualitative leap in yield.

[0029] like Figure 3 , Figure 4 and Figure 5As shown, the lower slider 3 has a base with a first groove 3-1 on its upper surface. A first slide rail 2 is installed in the first groove 3-1. The lower slider 1 has a first groove 1-1 at its bottom that mates with the first slide rail 2. A first straight-moving mechanism is installed in the first groove 3-1 of the lower slider 3. The extension end of the first straight-moving mechanism is connected to the upper slider 1, driving the upper slider 1 to move along the first slide rail 2. The first straight-moving mechanism is a first hydraulic cylinder 6, which is directly installed at the end of the first groove 3-1. The first hydraulic cylinder 6 is integrated into the lower slider 3 and is connected to a valve seat via a high-pressure hose. The valve seat is connected to a hydraulic pump station via a rigid pipe. The extension rod of the first hydraulic cylinder 6 is connected to the upper slider 1, which can drive the upper slider 1 to move along the first slide rail 2.

[0030] like Figure 1 As shown, the upper template is provided with a mounting base having a second groove, in which a second slide rail 4 is installed. The bottom of the lower slider 3 is provided with a second sliding groove 3-2 that mates with the second slide rail 4. The second straight-moving mechanism is installed in the second groove, and the extension end of the second straight-moving mechanism is connected to the lower slider 3, driving the lower slider 3 to move along the second slide rail 4. The second straight-moving mechanism is a second hydraulic cylinder 7, which is directly installed in the second groove and integrated into the mounting base. The second hydraulic cylinder 7 is connected to a valve seat via a high-pressure hose, and the valve seat is connected to a hydraulic pump station via a rigid pipe. The extension rod of the second hydraulic cylinder 7 is connected to the lower slider 3, which can drive the lower slider 3 to move along the second slide rail 4.

[0031] The impeller injection mold described in this utility model, through a combined slider, enables a step-by-step demolding strategy. Specifically, the upper slider 1 first slides along the first direction to release the clamping force, and then the lower slider 3 is pulled out radially along the second direction, solving the problem of the enormous resistance encountered in traditional one-step demolding with a single integral slider. The second-direction movement of the lower slider 3 only occurs after the negative angle clamping force has been largely released, significantly reducing its frictional resistance. The independent driving of the first hydraulic cylinder 6 and the second hydraulic cylinder 7 ensures that the driving force precisely matches the actual needs of each stage, avoiding overload of the mechanism.

[0032] Both the first and second directions point towards the core mold 5, and the angle between the first and second directions is an acute angle. The angle between the first and second directions is 10-25°, which can optimize the utilization of mold space. Compared with the traditional solution that requires a large angle (e.g., >45°) integral slider to avoid negative angles, this utility model minimizes the projected size of the combined slider perpendicular to the second direction. The structure in which the first slide rail / groove is built into the first groove of the lower slider and the second slide rail / groove is built into the second groove of the upper template further realizes the hidden layout of the drive component and avoids spatial interference.

[0033] like Figure 3 and Figure 4As shown, the front ends of both the upper slider 1 and the lower slider 3 are forming parts, used to form the airfoil of the impeller mold cavity blades. The lower surface of the forming part of the upper slider 1 and the upper surface of the forming part of the lower slider 3 are fitted together by a stepped stop. This stepped stop fit is crucial for ensuring precision. During the mold closing and injection molding stage, the lower surface of the upper slider forming part and the upper surface of the lower slider forming part are tightly engaged and locked together by the precise stepped stop. This eliminates the splicing misalignment and flash problems that easily occur in traditional assemblies, ensuring that the combined sliders form a rigid, seamless, high-precision blade cavity wall. The thickness of the upper slider 1 forming part is h1, and the thickness of the lower slider 3 forming part is h2, h1 + h2 = H, where H is the width of the mold cavity blades. The thickness h1 of the upper slider 1 forming part is less than the thickness h2 of the lower slider 3 forming part, preferably h1 = 0.3~0.4H.

[0034] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0035] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. All equivalent embodiments or modifications made without departing from the spirit of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A impeller injection mold, comprising an upper mold plate, a lower mold plate, a core mold (5) and sliders; the core mold (5) is located on the upper mold plate, the sliders are distributed circumferentially around the periphery of the core mold (5), and the sliders, the core mold (5), the upper mold plate and the lower mold plate constitute a mold cavity of the impeller; characterized in that, The slider is a combined slider, which includes an upper slider (1) and a lower slider (3). The lower slider (3) is movably mounted on the upper template along a second direction, and the upper slider (1) is movably mounted on the lower slider (3) along a first direction. The lower slider (3) is connected to a second straight-line mechanism to drive the lower slider (3) to move along the second direction on the upper template. The upper slider (1) is connected to a first straight-line mechanism to drive the upper slider (1) to move along the first direction on the lower slider (3).

2. The impeller injection mold of claim 1, wherein, Both the first direction and the second direction point to the core mold (5), and the angle between the first direction and the second direction is an acute angle.

3. The impeller injection mold of claim 2, wherein, The angle between the first direction and the second direction is 10 to 25°.

4. The impeller injection mold of claim 1, wherein, The lower slider (3) has a first groove (3-1) on its upper surface. A first slide rail (2) is installed in the first groove (3-1). The upper slider (1) has a first groove (1-1) at its bottom that cooperates with the first slide rail (2). The first straight-line mechanism is installed in the first groove (3-1) of the lower slider (3). The extension end of the first straight-line mechanism is connected to the upper slider (1) to drive the upper slider (1) to move along the first slide rail (2).

5. The impeller injection mold of claim 1, wherein, The upper template is provided with a second groove, and a second slide rail (4) is installed in the second groove. The bottom of the lower slider (3) is provided with a second slide groove (3-2) that cooperates with the second slide rail (4). The second straight-line mechanism is installed in the second groove. The stretching end of the second straight-line mechanism is connected to the lower slider (3) to drive the lower slider (3) to move along the second slide rail (4).

6. The impeller injection mold of claim 1, wherein, The front ends of the upper slider (1) and the lower slider (3) are both forming parts, which are used to form the blade surface of the impeller mold cavity; the lower surface of the forming part of the upper slider (1) and the upper surface of the forming part of the lower slider (3) are fitted by a stepped stop.

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