Closed impeller mold

Abstract

The utility model provides a closed impeller mould, which belongs to the technical field of moulds and comprises a lower mould, a middle mould, an upper mould, a main framework and a plurality of blade moulds, the lower mould, the main framework and the upper mould are sequentially arranged from bottom to top, the plurality of blade moulds are circumferentially inserted into the main framework, and the middle mould is sleeved on the peripheries of the plurality of blade moulds and the upper mould; the main framework is provided with a rear cover plate framework and a front cover plate framework, the rear cover plate framework and the front cover plate framework are connected through a plurality of blade frameworks, a rear cover plate cavity is formed in the periphery of the rear cover plate framework, a front cover plate cavity is formed in the periphery of the front cover plate framework, and blade cavities are formed in the peripheries of the blade frameworks; an overflow groove is formed in the inner wall of the middle mold; exhaust holes are formed in the middles of the upper mold and the blade mold. The closed impeller mold provided by the utility model can meet the universal preparation of a polyurethane impeller and a natural rubber impeller, is simple in structure, can realize the preparation of two impellers made of different materials, reduces the mold cost, and improves the production efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and more specifically relates to a closed impeller mold. Background Art

[0002] The closed impeller used in mortar pumps and slurry pumps has high requirements for corrosion resistance and wear resistance. Usually, the impeller is made of alloy cast iron. However, due to the wear resistance of alloy cast iron, its service life is short. Generally, it can only be used for 4 months before it needs to be replaced as a whole. The cost is high. In addition, the alloy cast iron impeller is heavy and consumes more energy during operation.

[0003] With the widespread application of polymer materials, people try to replace alloy cast iron with polyurethane and natural rubber. Compared with alloy cast iron, polymer materials are cheaper, have lighter impellers and consume less energy.

[0004] In the prior art, the impeller molds for preparing polyurethane and the impeller molds for preparing natural rubber usually need to be designed separately and the structures are also very complicated, resulting in increased manufacturing costs. Utility Model Content

[0005] The utility model aims to provide a closed impeller mold, aiming to solve the problem that the impeller molds for preparing polyurethane and natural rubber are not universal and have a complex structure, resulting in increased costs.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a closed impeller mold, including a lower mold, a middle mold, an upper mold, a main frame and a plurality of blade molds, wherein the lower mold, the main frame and the upper mold are arranged in sequence from bottom to top, and the plurality of blade molds are circumferentially inserted into the main frame, and the middle part of the middle mold is provided with an adapter hole, and the middle mold is sleeved on the outer periphery of the plurality of blade molds and the upper mold by means of the adapter hole; the main frame is provided with a rear cover plate frame at the bottom and a front cover plate frame at the top, and the rear cover plate frame is connected to the lower mold, and the rear cover plate frame is connected to the lower mold, and the rear cover plate frame is connected to the lower mold, and the rear cover plate frame is connected to the lower mold, and the rear cover plate frame is connected to the lower mold, and the rear cover plate frame is connected to the upper ... The plate frame and the front cover frame are connected by a plurality of blade frames, the rear cover frame is located between the lower mold and the blade mold, the outer periphery of the rear cover frame is provided with a rear cover cavity for forming the rear cover, the front cover frame is located between the upper mold and the blade mold, the outer periphery of the front cover frame is provided with a front cover cavity for forming the front cover, the blade frame is located between two adjacent groups of the blade molds, the outer periphery of the blade frame is provided with a blade cavity for forming the blade, and the front cover cavity, the blade cavity and the rear cover cavity are sequentially connected;

[0007] An overflow groove connected to the front cover plate cavity is provided on the inner wall of the adapter hole of the middle mold, and mutually connected exhaust holes are longitudinally provided in the middle of the upper mold and the blade mold, the lower end of the exhaust hole is connected to the rear cover plate cavity, and the upper end of the exhaust hole is connected to the external environment.

[0008] In a possible implementation, a fixing screw is provided through the middle of the lower mold from bottom to top, and the fixing screw is threadedly connected to the middle of the rear cover frame. A positioning screw is threadedly connected from bottom to top on one side of the lower mold, and the upper end of the positioning screw is inserted into the positioning hole on one side of the rear cover frame.

[0009] In a possible implementation, the plurality of blade molds are arranged on the upper end surface of the lower mold through a stopper, and first positioning holes are provided at the end surface edge of the lower mold and the end surface edge of the plurality of blade molds correspondingly, and a first positioning pin is longitudinally passed through the first positioning hole.

[0010] In a possible implementation, a first guide bevel is formed in the circumference of the plurality of blade molds, the first guide bevel is inclined outward from top to bottom, the lower circumference of the adapting hole of the middle mold is provided with a first adapting bevel adapted to the first guide bevel, the upper circumference of the adapting hole of the middle mold is provided with a second guide bevel, the second guide bevel is inclined outward from top to bottom, an adapter is provided in the middle of the lower end surface of the upper mold, and the outer periphery of the adapter is provided with a second adapting bevel adapted to the second guide bevel.

[0011] In a possible implementation, a horizontal step surface is provided between the first adapting inclined surface and the second guiding inclined surface, and the step surface is pressed on the circumference of the upper end surfaces of the plurality of blade molds. A first positioning boss is provided on the lower end surface of the step surface, and a first positioning groove is provided on the upper end surface of the blade mold for longitudinal insertion and mating with the corresponding first positioning boss.

[0012] In a possible implementation, there are multiple overflow grooves, and multiple overflow grooves are circumferentially opened on the second guide slope. The upper end surface of the blade mold is provided with multiple connecting grooves connected to the front cover plate cavity, and the multiple connecting grooves are connected to the multiple overflow grooves in a one-to-one manner.

[0013] In a possible implementation, second positioning holes are correspondingly provided at the end surface edges of the upper mold and the end surface edges of the middle mold, and a second positioning pin is longitudinally penetrated through the second positioning hole.

[0014] In a possible implementation, a conical assembly hole is longitudinally arranged in the middle of the plurality of blade molds, the lower end of the conical assembly hole is connected to the rear cover plate cavity, the inner diameter of the conical assembly hole gradually decreases from top to bottom, a mushroom head core is installed in the conical assembly hole, and the lower end surface of the mushroom head core constitutes the mushroom head contour of the rear cover plate cavity.

[0015] In a possible implementation, outer walls of the lower mold, the middle mold, and the upper mold are all provided with handles.

[0016] In one possible implementation, the blade mold includes a lower blade mold and an upper blade mold, the upper blade mold is arranged on the upper end surface of the lower blade mold through a stop, the lower end surface of the upper blade mold is provided with a second positioning boss, and the upper end surface of the lower blade mold is provided with a second positioning groove longitudinally inserted and matched with the second positioning boss.

[0017] The beneficial effect of a closed impeller mold provided by the utility model is that, compared with the prior art, a blade cavity is formed inside the blade mold, a rear cover plate cavity is formed around the rear cover plate frame, and a front cover plate cavity is formed around the front cover plate frame; the blade cavity, the rear cover plate cavity and the front cover plate cavity are connected in sequence to form an integral molding chamber.

[0018] When making a natural rubber impeller, place the main frame on the lower mold, screw the set screw into the threaded hole of the rear cover frame, position the positioning screw through the positioning holes of the lower mold and the rear cover frame, use the set screw and positioning screw to position the rear cover frame on the lower mold without turning, insert multiple lower blade molds into the main frame circumferentially, and position the lower blade mold with the lower mold through the stopper, the first positioning pin, and the first positioning hole. Multiple upper blade molds are placed on multiple lower blade molds correspondingly, and are positioned through the stopper, the second positioning boss, and the second positioning groove. The mushroom head core is placed in the conical assembly hole formed by the upper blade mold and the lower blade mold. After the mold is preheated, a portion of natural rubber is first filled in the flow channel formed by the lower mold, the upper blade mold, the lower blade mold, the mushroom head core, and the rear cover frame, and then the middle mold is placed on the blade mold and positioned through the adapter hole and the first positioning boss. A plurality of evenly distributed overflow grooves are opened on the inner hole wall of the middle mold, and then the remaining natural rubber is filled in the material cavity composed of the middle mold, the blade mold and the mushroom head core according to the calculated filling amount of rubber, and the upper mold is covered and positioned with the middle mold through a plurality of second positioning pins and a plurality of second positioning holes. The excess natural rubber can flow out from the overflow grooves on the inner hole wall of the middle mold and the exhaust hole in the center, so as to achieve the dual functions of overflowing rubber and exhausting, and the natural rubber impeller is vulcanized and formed on the vulcanizer.

[0019] The same mold is used to prepare the polyurethane impeller. The main frame is placed on the lower mold, the set screw is screwed into the threaded hole of the rear cover frame, the positioning screw is positioned through the positioning holes of the lower mold and the rear cover frame, and the rear cover frame is positioned on the lower mold without rotation using the set screw and the positioning screw. Multiple lower blade molds are placed on the lower mold, and positioned through the stopper, the first positioning pin, and the first positioning hole. Multiple upper blade molds are placed on multiple lower blade molds correspondingly, and positioned through the stopper, the second positioning boss, and the second positioning groove. The mushroom head core is placed in the conical assembly hole formed by the upper blade mold and the lower blade mold, and the middle mold is placed on the blade mold, and positioned through the adapter hole and the first positioning boss. A plurality of evenly distributed overflow grooves are opened on the inner hole wall of the middle mold. After the mold is preheated, a certain volume of the prepared polyurethane mixture is openly poured into the material cavity composed of the lower mold, the upper blade mold, the lower blade mold, the mushroom head core, the rear cover plate frame, the front cover plate frame and the middle mold. The upper mold is covered and positioned with the middle mold through a plurality of second positioning pins and a plurality of second positioning holes. Excess polyurethane liquid can flow out from the overflow groove and the central exhaust hole on the inner hole wall of the middle mold, so as to achieve the dual functions of overflowing glue and exhausting, avoid the generation of bubbles, and finally form the polyurethane impeller.

[0020] The utility model provides a closed impeller mold, which can meet the general preparation requirements of polyurethane impellers and natural rubber impellers. The mold can realize the preparation of impellers made of two different materials, thereby reducing mold costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic structural diagram of a closed impeller mold provided by the utility model;

[0023] Figure 2 A top view of the upper blade mold provided by the utility model;

[0024] Figure 3 This is a top view of the middle mold provided by the utility model.

[0025] Description of reference numerals:

[0026] 100, lower mold; 110, set screw; 120, positioning screw; 130, first positioning hole; 140, first positioning pin; 200, upper mold; 210, exhaust hole; 220, second positioning hole; 230, second positioning pin; 300, middle mold; 310, overflow groove; 320, second guide slope; 330, tapered assembly hole; 340, mushroom head core; 350, first positioning boss; 410, lower blade mold; 420, upper blade mold; 430, first guide slope; 440, connecting groove; 450, second positioning boss; 460, first positioning groove; 470, second positioning groove; 500, rear cover frame; 600, front cover frame; 700, handle. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0029] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the utility model.

[0030] See also Figure 1Now, a closed impeller mold provided by the utility model is described. A closed impeller mold includes a lower mold 100, a middle mold 300, an upper mold 200, a main frame and a plurality of blade molds. The lower mold 100, the main frame and the upper mold 200 are arranged in sequence from bottom to top, and a plurality of blade molds are circumferentially inserted into the main frame. The middle part of the middle mold 300 is provided with an adapting hole, and the middle mold 300 is sleeved on the outer periphery of the plurality of blade molds and the upper mold 200 by means of the adapting hole; the main frame includes a lower rear cover plate frame 500 and an upper front cover plate frame 600, the rear cover plate frame 500 is connected to the lower mold 100, the rear cover plate frame 500 and the front cover plate frame 600 are connected through a plurality of blade frames, the rear cover plate frame 500 is located between the lower mold 100 and the blade mold, and the rear cover plate frame 500 is provided with a plurality of blade frames. The outer periphery of the plate frame 500 has a rear cover plate cavity for forming a rear cover plate, the front cover plate frame 600 is located between the upper mold 200 and the blade mold, the outer periphery of the front cover plate frame 600 has a front cover plate cavity for forming a front cover plate, the blade frame is located between two adjacent groups of blade molds, the outer periphery of the blade frame has a blade cavity for forming blades, the front cover plate cavity, the blade cavity and the rear cover plate cavity are connected in sequence; the inner wall of the adapter hole of the middle mold 300 is provided with an overflow groove 310 connected to the front cover plate cavity, and the upper mold 200 and the middle of the blade mold are longitudinally provided with mutually connected exhaust holes 210, the lower end of the exhaust hole 210 is connected to the rear cover plate cavity, and the upper end of the exhaust hole 210 is connected to the external environment.

[0031] The utility model provides a closed impeller mold. Compared with the prior art, the interior of the blade mold forms a blade cavity, the periphery of the rear cover plate frame 500 forms a rear cover plate cavity, and the periphery of the front cover plate frame 600 forms a front cover plate cavity. The blade cavity, the rear cover plate cavity and the front cover plate cavity are connected in sequence to form an integral molding chamber.

[0032] When making a natural rubber impeller, place the main frame on the lower mold 100, screw the fixing screw 110 into the threaded hole of the rear cover frame 500, and position the positioning screw 120 through the positioning holes of the lower mold 100 and the rear cover frame 500. Use the fixing screw 110 and the positioning screw 120 to position the rear cover frame 500 on the lower mold 100 without rotating. Insert multiple lower blade molds 410 circumferentially into the main frame, and the lower blade molds 410 are positioned with the lower mold 100 through the stopper and the first positioning pin 140 and the first positioning hole 130. Multiple upper blade molds 420 are placed on the multiple lower blade molds 410 accordingly, and are positioned through the stopper and the second positioning boss 450 and the second positioning groove 470. The mushroom head core 340 is placed in the conical assembly hole 330 formed by the upper blade mold 420 and the lower blade mold 410. After the mold is preheated, a portion of natural rubber is first filled in the flow channel formed by the lower mold 100, the upper blade mold 420, the lower blade mold 410, the mushroom head core 340 and the rear cover plate frame 500, and then the middle mold 300 is placed on the blade mold and positioned through the adapter hole and the first positioning boss 350. A plurality of evenly distributed overflow grooves 310 are opened on the inner hole wall of the middle mold 300, and then the remaining natural rubber is filled in the material cavity composed of the middle mold 300, the blade mold, and the mushroom head core 340 according to the calculated filling amount of rubber, and then the upper mold 200 is covered and positioned with the middle mold 300 through a plurality of second positioning pins 230 and a plurality of second positioning holes 220. The excess natural rubber can flow out from the overflow grooves 310 on the inner hole wall of the middle mold 300 and the exhaust hole 210 in the center, so as to achieve the dual functions of overflowing rubber and exhausting, and the natural rubber impeller is vulcanized and formed on the vulcanizer.

[0033] The same mold is used to prepare the polyurethane impeller. The main frame is placed on the lower mold 100, the set screw 110 is screwed into the threaded hole of the rear cover frame 500, and the positioning screw 120 is positioned through the positioning holes of the lower mold 100 and the rear cover frame 500. The rear cover frame 500 is positioned on the lower mold 100 by the set screw 110 and the positioning screw 120 without rotating. A plurality of lower blade molds 410 are placed on the lower mold 100 and positioned by the stopper, the first positioning pin 140, and the first positioning hole 130. A plurality of upper blade molds 420 are placed on the plurality of lower blade molds 410 correspondingly and positioned by the stopper, the second positioning boss 450, and the second positioning groove 470. The mushroom head core 340 is placed in the tapered assembly hole 330 formed by the upper blade mold 420 and the lower blade mold 410, and the middle mold 300 is placed on the blade mold and positioned by the adapter hole and the first positioning boss 350. A plurality of evenly distributed overflow grooves 310 are opened on the inner hole wall of the middle mold 300. After the mold is preheated, a certain volume of the prepared polyurethane mixture is openly poured into the material cavity composed of the lower mold 100, the upper blade mold 420, the lower blade mold 410, the mushroom head core 340, the rear cover plate frame 500, the front cover plate frame 600 and the middle mold 300. The upper mold 200 is covered and positioned with the middle mold 300 through a plurality of second positioning pins 230 and a plurality of second positioning holes 220. Excess polyurethane liquid can flow out from the overflow grooves 310 and the central exhaust hole 210 on the inner hole wall of the middle mold 300, so as to achieve the dual functions of overflowing glue and exhausting, avoid the generation of bubbles, and finally form the polyurethane impeller.

[0034] The utility model provides a closed impeller mold, which can meet the general preparation requirements of polyurethane impellers and natural rubber impellers, has a simple structure, and can realize the preparation of impellers made of two different materials, thereby reducing mold costs and improving production efficiency.

[0035] See also Figure 1 A set screw 110 is provided through the middle of the lower mold 100 from bottom to top, and the set screw 110 is threadedly connected to the middle of the rear cover frame 500. A positioning screw 120 is threadedly connected from bottom to top on one side of the lower mold 100, and the upper end of the positioning screw 120 is inserted into the positioning hole on one side of the rear cover frame 500.

[0036] Specifically, a threaded hole is longitudinally formed in the middle of the lower mold 100, and a threaded hole opening downward is formed in the middle of the rear cover plate frame 500. The set screw 110 is threadedly connected in the above-mentioned connecting threaded hole from bottom to top, thereby connecting the rear cover plate frame 500 with the lower mold 100. In addition, a threaded countersunk hole is formed on one side of the lower end surface of the lower mold 100, and the positioning screw 120 passes through the threaded countersunk hole and is threadedly connected in the threaded hole on one side of the rear cover plate frame 500, thereby realizing the positioning of the rear cover plate frame 500 in the rear cover plate cavity.

[0037] A plurality of blade molds are arranged on the upper end surface of the lower mold 100 through stoppers, and first positioning holes 130 are arranged correspondingly at the end surface edges of the lower mold 100 and the end surface edges of the blade molds, and first positioning pins 140 are longitudinally penetrated in the first positioning holes 130. The first positioning holes 130 are respectively opened at the end surface edges of the lower mold 100 and the end surface edges of the plurality of blade molds, and the first positioning holes 130 are coaxially arranged, and the first positioning pins 140 penetrate the first positioning holes 130 from top to bottom, thereby realizing the positioning of the lower mold 100 and the blade molds, and preventing the lower mold 100 and the blade molds from rotating relative to each other.

[0038] A first guiding slope 430 is formed in the circumference of multiple blade molds, and the first guiding slope 430 is inclined outward from top to bottom. The lower circumference of the matching hole of the middle mold 300 is provided with a first matching slope that matches the first guiding slope 430. The middle mold 300 is installed on the outer circumference of the blade mold through the inclined guidance of the first guiding slope 430 and the first matching slope. A second guiding slope 320 is provided in the upper circumference of the matching hole of the middle mold 300, and the second guiding slope 320 is inclined outward from top to bottom. An adapter is provided in the middle of the lower end surface of the upper mold 200, and a second matching slope that matches the second guiding slope 320 is provided on the outer circumference of the adapter. The upper mold 200 is installed in the matching hole of the blade mold through the inclined guidance of the second guiding slope 320 and the second matching slope.

[0039] See also Figure 1 and Figure 2 There is a horizontal stepped surface between the first matching inclined surface and the second guiding inclined surface 320, and the stepped surface is pressed on the circumference of the upper end surface of the plurality of blade molds. A first positioning boss 350 is provided on the lower end surface of the stepped surface, and a first positioning groove 460 is provided on the upper end surface of the blade mold to be longitudinally inserted and matched with the first positioning boss 350. The number of the first positioning groove 460 is also one. The first positioning boss 350 is inserted into the first positioning groove 460 to realize the circumferential positioning of the middle mold 300 and the blade mold, and prevent the middle mold 300 from rotating relative to the blade mold.

[0040] See also Figure 1 and Figure 3 The number of overflow grooves 310 is multiple, and the multiple overflow grooves 310 are circumferentially opened on the second guide inclined surface 320. The upper end surface of the blade mold is provided with a connecting groove 440 connected to the front cover plate cavity, and the multiple connecting grooves 440 are connected to the multiple overflow grooves 310 in a one-to-one correspondence. Specifically, the number of the connecting grooves 440 and the number of the overflow grooves 310 are both eight, with a width of 10 mm and a depth of 5 mm. The eight overflow grooves 310 can evenly flow out the excess natural rubber liquid or polyurethane liquid.

[0041] The end face edges of the upper mold 200 and the middle mold 300 are correspondingly provided with second positioning holes 220, and second positioning pins 230 are longitudinally penetrated in the second positioning holes 220. The second positioning holes 220 are respectively opened at the end face edges of the upper mold 200 and the end face edges of the middle mold 300, and the second positioning holes 220 are coaxially arranged, and the second positioning pins 230 penetrate the second positioning holes 220 from top to bottom, thereby realizing the positioning of the upper mold 200 and the middle mold 300, and preventing the upper mold 200 and the middle mold 300 from rotating relative to each other.

[0042] See also Figure 1 A tapered assembly hole 330 is longitudinally arranged in the middle of the plurality of blade molds. The lower end of the tapered assembly hole 330 is connected to the rear cover plate cavity. The inner diameter of the tapered assembly hole 330 gradually decreases from top to bottom. A mushroom head core 340 is installed in the tapered assembly hole 330. The outer periphery of the mushroom head core 340 forms a tapered structure that gradually decreases from top to bottom. The tapered structure is adapted to the tapered assembly hole 330. The lower end face of the mushroom head core 340 is an arcuate surface that is adapted to the end face shape of the impeller mushroom head. When the mushroom head core 340 is fully inserted into the tapered assembly hole 330, the lower end face of the mushroom head core 340 forms the mushroom head contour of the rear cover plate cavity.

[0043] Preferably, the outer walls of the lower mold 100, the middle mold 300 and the upper mold 200 are all provided with handles 700. There are multiple handles 700, which are symmetrically or evenly distributed on the outer walls of the lower mold 100, the middle mold 300 and the upper mold 200, so that the sling or hook of the lifting equipment is conveniently hung on the handles 700 for lifting. In addition, the lower mold 100, the middle mold 300 and the upper mold 200 are correspondingly provided with lifting holes, and the lower mold 100, the middle mold 300 and the upper mold 200 can be lifted by means of the lifting holes.

[0044] See also Figure 1Preferably, the blade mold includes a lower blade mold 410 and an upper blade mold 420, the lower blade mold 410 is arranged on the upper end surface of the lower mold 100, the rear cover plate frame 500 is located between the lower mold 100 and the multiple lower blade molds 410, the front cover plate frame 600 is located between the upper mold 200 and the multiple upper blade molds 420, the middle mold 300 is sleeved on the outer periphery of the multiple lower blade molds 410 and the multiple upper blade molds 420 by means of matching holes, the multiple upper blade molds 420 and the multiple lower blade molds 410 jointly constitute the above-mentioned first guide bevel 430, and the lower part of the matching holes of the middle mold 300 is jointly sleeved on the first guide bevel 430. The upper blade mold 420 is arranged on the upper end surface of the lower blade mold 410 through a stopper, and the lower end surface of the upper blade mold 420 is provided with a second positioning boss 450, and the upper end surface of the lower blade mold 410 is provided with a second positioning groove 470 which is longitudinally inserted and matched with the second positioning boss 450. The second positioning boss 450 is inserted in the second positioning groove 470 to realize the circumferential positioning of the lower blade mold 410 and the upper blade mold 420 to prevent the upper blade mold 420 from rotating relative to the lower blade mold 410.

[0045] In addition, the upper blade mold 420 and the lower blade mold 410 are respectively provided in plurality, and the plurality of upper blade molds 420 and the plurality of lower blade molds 410 are respectively evenly arranged circumferentially, and two adjacent upper blade molds 420 and two adjacent lower blade molds 410 together constitute a blade cavity.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A closed impeller mold, characterized in that: The invention comprises a lower mold (100), a middle mold (300), an upper mold (200), a main frame and a plurality of blade molds, wherein the lower mold (100), the main frame and the upper mold (200) are arranged in sequence from bottom to top, and the plurality of blade molds are circumferentially inserted into the main frame, the middle portion of the middle mold (300) is provided with an adapting hole, and the middle mold (300) is sleeved on the outer circumference of the plurality of blade molds and the upper mold (200) by means of the adapting hole; the main frame comprises a rear cover plate frame (500) at the bottom and a front cover plate frame (600) at the top, the rear cover plate frame (500) being connected to the lower mold (100), and the rear cover plate frame (500) is connected to the lower mold (100). 0) and the front cover plate frame (600) are connected through a plurality of blade frames, the rear cover plate frame (500) is located between the lower mold (100) and the blade mold, the outer periphery of the rear cover plate frame (500) is provided with a rear cover plate cavity for molding the rear cover plate, the front cover plate frame (600) is located between the upper mold (200) and the blade mold, the outer periphery of the front cover plate frame (600) is provided with a front cover plate cavity for molding the front cover plate, the blade frame is located between two adjacent groups of the blade molds, the outer periphery of the blade frame is provided with a blade cavity for molding the blades, and the front cover plate cavity, the blade cavity and the rear cover plate cavity are sequentially connected; An overflow groove (310) connected to the front cover plate cavity is provided on the inner wall of the adapter hole of the middle mold (300), and mutually connected exhaust holes (210) are longitudinally provided in the middle of the upper mold (200) and the blade mold, wherein the lower end of the exhaust hole (210) is connected to the rear cover plate cavity, and the upper end of the exhaust hole (210) is connected to the external environment.

2. A closed impeller mold as claimed in claim 1, characterized in that: A fixing screw (110) is provided through the middle of the lower mold (100) from bottom to top, and the fixing screw (110) is threadedly connected to the middle of the rear cover frame (500). A positioning screw (120) is threadedly connected from bottom to top on one side of the lower mold (100), and the upper end of the positioning screw (120) is inserted into a positioning hole on one side of the rear cover frame (500).

3. A closed impeller mold as claimed in claim 1, characterized in that: The plurality of blade molds are arranged on the upper end surface of the lower mold (100) through a stopper, and first positioning holes (130) are arranged at the end surface edge of the lower mold (100) and the end surface edge of the plurality of blade molds correspondingly, and a first positioning pin (140) is longitudinally penetrated in the first positioning hole (130).

4. A closed impeller mold as claimed in claim 1, characterized in that: A plurality of blade molds form a first guiding bevel (430) in the circumference, the first guiding bevel (430) is inclined outward from top to bottom, the lower circumference of the adapting hole of the middle mold (300) is provided with a first adapting bevel adapted to the first guiding bevel (430), the upper circumference of the adapting hole of the middle mold (300) is provided with a second guiding bevel (320), the second guiding bevel (320) is inclined outward from top to bottom, an adapter is provided in the middle of the lower end surface of the upper mold (200), and the outer circumference of the adapter is provided with a second adapting bevel adapted to the second guiding bevel (320).

5. A closed impeller mold as claimed in claim 4, characterized in that: A horizontal step surface is provided between the first adapting inclined surface and the second guiding inclined surface (320), and the step surface is pressed on the circumference of the upper end surfaces of the plurality of blade molds. A first positioning boss (350) is provided on the lower end surface of the step surface, and a first positioning groove (460) is provided on the upper end surface of the blade mold to longitudinally insert and cooperate with the first positioning boss (350).

6. A closed impeller mold as claimed in claim 4, characterized in that: There are a plurality of overflow grooves (310), and the plurality of overflow grooves (310) are circumferentially opened on the second guide inclined surface (320). The upper end surface of the blade mold is provided with a connecting groove (440) connected to the front cover plate cavity, and the plurality of connecting grooves (440) are connected to the plurality of overflow grooves (310) in a one-to-one correspondence.

7. A closed impeller mold as claimed in claim 1, characterized in that: Second positioning holes (220) are correspondingly arranged at the end surface edges of the upper mold (200) and the end surface edges of the middle mold (300), and a second positioning pin (230) is longitudinally penetrated in the second positioning hole (220).

8. A closed impeller mold as claimed in claim 1, characterized in that: A conical assembly hole (330) is longitudinally arranged in the middle of the plurality of blade molds, the lower end of the conical assembly hole (330) is connected to the rear cover plate cavity, the inner diameter of the conical assembly hole (330) gradually decreases from top to bottom, a mushroom head core (340) is installed in the conical assembly hole (330), and the lower end surface of the mushroom head core (340) constitutes the mushroom head contour of the rear cover plate cavity.

9. A closed impeller mold as claimed in claim 1, characterized in that: The outer walls of the lower mold (100), the middle mold (300) and the upper mold (200) are all provided with handles (700).

10. A closed impeller mold according to any one of claims 1 to 9, characterized in that: The blade mold comprises a lower blade mold (410) and an upper blade mold (420); the upper blade mold (420) is arranged on the upper end surface of the lower blade mold (410) through a stop; the lower end surface of the upper blade mold (420) is provided with a second positioning boss (450); the upper end surface of the lower blade mold (410) is provided with a second positioning groove (470) longitudinally inserted and matched with the second positioning boss (450).

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