Impeller Rotor Injection Molding Device and Method for Electric Water Pump

Abstract

The present invention relates to an injection molding device and method for an impeller rotor of an electronic water pump. The injection molding device includes an injection molding machine, a mold, an insert, an oven, and a press tooling. The mold has a first mold and a second mold for injection molding of a to-be-injection-molded part. During the injection molding process, the first mold and the second mold are controlled at a first temperature. The insert is detachably arranged on the second mold and, after the molds are closed, cooperates with the first mold, the second mold, and the to-be-injection-molded part placed on the first mold to form an injection molding cavity. During the injection molding process, the forming part of the cavity is controlled at a second temperature. After injection molding and mold opening, the insert coaxially covers the outside of the injection-molded impeller rotor and disengages from contact with the second mold. The oven is arranged beside the injection molding machine for heating the insert. The press tooling is arranged beside the injection molding machine for separating the insert and the injection-molded impeller rotor. The first temperature is lower than the second temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of impeller rotor injection molding, and particularly to an impeller rotor injection molding device for an electronic water pump and an injection molding method thereof. Background Art

[0002] The impeller rotor, which is a component of a brushless electronic water pump, needs to be injection molded twice during the production process. For the first injection molding, an aluminum-nickel-boron magnet needs to be embedded, and for the second injection molding, the aluminum-nickel-boron magnet needs to be wrapped to prevent the magnet from rusting and cracking. Currently, due to the technical bottlenecks in injection molding production in the industry, most use PP (polypropylene) and POM (polyoxymethylene) materials for injection molding. With the rapid development of the dishwasher industry, in order to adapt to complex working environments, the impeller rotor is required to have the characteristics of resistance to high and low temperature shocks and long life. However, conventional PP and POM materials cannot meet the requirement of stable operation between -40 degrees Celsius and 120 degrees Celsius. Through testing, polyphenylene sulfide containing 40% glass fiber can meet the requirement of stable operation between -40 degrees Celsius and 120 degrees Celsius. However, the gap between the aluminum-nickel-boron magnet and the stator core is limited (after the impeller rotor is installed, the gap with the stator core is limited), so that the thickness of the injection molding material wrapped around the outer layer of the aluminum-nickel-boron magnet can only be made 0.5 - 0.6 mm. How to make the polyphenylene sulfide material containing 40% glass fiber maintain good fluidity in such a narrow space, so as to obtain a high degree of crystallization and a smooth product surface, is a major difficulty in the industry. Summary of the Invention

[0003] Embodiments of the present invention provide an impeller rotor injection molding device for an electronic water pump and an injection molding method thereof to solve the problems in the prior art.

[0004] Embodiments of the present invention adopt the following technical solutions: An impeller rotor injection molding device for an electronic water pump includes an injection molding machine, a mold, an insert, an oven, and a press tooling, wherein: The mold is installed on the injection molding machine and has a first mold and a second mold for injection molding of a to-be-injection molded part; during the injection molding process, the first mold and the second mold are controlled at a first temperature; The insert is detachably arranged on the second mold and, after the mold is closed, cooperates with the first mold, the second mold, and the to-be-injection molded part placed on the first mold to form an injection molding cavity; during the injection molding process, the forming part of the cavity is controlled at a second temperature, so that the injection molding material can flow in the cavity with a 0.5 - 0.6 mm gap; after injection molding and mold opening, the insert coaxially wraps around the outer of the injection molded impeller rotor and disengages from the second mold; The oven is arranged beside the injection molding machine for heating the insert; The press tooling is arranged beside the injection molding machine for separating the insert and the injection molded impeller rotor; The first temperature is lower than the second temperature.

[0005] Preferably, the first temperature is 120 - 160 degrees Celsius, and the second temperature is 170 - 190 degrees Celsius.

[0006] Preferably, there are at least two inserts, at least one of which is heated in the oven and at least one of which is located in the mold for injection molding.

[0007] Preferably, the injection molding material is polyphenylene sulfide containing 40% glass fiber.

[0008] Preferably, the first mold includes: a first mold base; a first mold core disposed on the first mold base; a first slider slidably disposed on the first mold core; a slider core connected or integrally formed on the first slider; in the closed mold state, the slider core cooperates with the insert, the second mold, and the workpiece to be injection molded placed on the first mold to form an injection cavity.

[0009] Preferably, in the closed mold state after injection molding, the slider core is embedded in the annular groove at the neck of the impeller rotor after injection molding.

[0010] Preferably, the press tooling includes: a base; a positioning bracket disposed on the base for placing the insert to be separated and the impeller rotor after injection molding; a guide post disposed on the base; a punch slidably disposed on the guide post and capable of moving relative to the positioning bracket to separate the insert and the impeller rotor after injection molding.

[0011] Preferably, the positioning bracket includes: a bracket body disposed on the base; a first groove located at the upper part of the bracket body; a second groove located at the lower part of the bracket body; a limiting portion located between the first groove and the second groove, so as to form a U-shaped narrow neck region at the junction of the first groove and the second groove, and the width of the narrow neck region is greater than the inner diameter of the insert and less than the outer diameter of the insert; when the insert to be separated and the impeller rotor after injection molding are placed on the positioning bracket, the insert is coaxial with the punch, the impeller part of the impeller rotor is located in the second groove, the upper end face of the limiting portion abuts against the lower end face of the insert, and there is a gap between the end of the limiting portion and the bottom wall of the annular groove at the neck of the impeller rotor.

[0012] An injection molding method for an impeller rotor of an electronic water pump, using the injection molding device for injection molding, includes:

[0013] Turn on the injection molding machine, control the temperature of the first mold and the second mold at the first temperature, and place the workpiece to be injection molded in the first mold of the mold;

[0014] Turn on the oven, place the insert in the oven for heating, and place the heated insert in the second mold of the mold so that the cavity forming part is controlled at the second temperature;

[0015] Close the first mold and the second mold so that the insert cooperates with the first mold, the second mold, and the workpiece to be injection molded placed on the first mold to form an injection cavity; inject into the cavity so that the injection molding material can flow in the cavity with a gap of 0.5-0.6 mm;

[0016] After injection molding, the mold is opened so that the insert is coaxially coated outside the impeller rotor after injection molding and is disengaged from the second mold.

[0017] Remove the insert and the impeller rotor after injection molding from the first mold, place them on the press tooling, and separate the insert and the impeller rotor after injection molding.

[0018] Preferably, there are at least two inserts, at least one of which is heated in an oven and at least one is used for injection molding.

[0019] The above at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects:

[0020] The insert is heated by an oven and then placed on the second mold. Using the heated insert as one of the components forming the injection cavity, the temperature at the forming part can be controlled at the second temperature, that is, the insert separable from the mold serves both as one of the components forming the injection cavity and as the core component for controlling the temperature at the forming part. Even if the gap between the outer surface of the alnico magnet and the inner wall of the insert is only 0.5 - 0.6 mm, it can ensure that the injection material has high fluidity, thereby obtaining a product with a high degree of crystallization and a smooth surface.

[0021] In addition, the heating system of the injection molding machine controls the overall mold temperature at the first temperature, and the insert controls the temperature at the forming part at the second temperature, realizing different temperatures at different parts. This can not only avoid the problem that the overall mold is kept at the high temperature of the second temperature, resulting in different degrees of influence on the overall mold base, guide pillars and bushings, and various transmission components, but also avoid the problem that the overall mold is kept at the first temperature (the temperature at the forming part is also at the first temperature), resulting in poor fluidity of the injection material and inability to fully fill. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 is an assembly schematic diagram of the first mold and the second mold of the present invention;

[0024] Figure 2 is a three - dimensional structural cross - section of the first mold and the second mold of the present invention Figure 1 ;

[0025] Figure 3 is a partial structural schematic diagram of the first mold and the second mold of the present invention;

[0026] Figure 4Schematic diagram of the assembly of the first core, the first slider and the impeller rotor of the present invention;

[0027] Figure 5 Stereoscopic structural section of the first mold and the second mold of the present invention Figure 2 ;

[0028] Figure 6 Stereoscopic structural diagram of the first mold and the impeller rotor of the present invention;

[0029] Figure 7 Stereoscopic structural diagram of the impeller rotor of the present invention;

[0030] Figure 8 Stereoscopic structural diagram of the press tooling of the present invention

[0031] Figure 9 Stereoscopic structural sectional view of the press tooling of the present invention;

[0032] Figure 10 Product schematic diagram of the injection molded part to be molded (semi-finished impeller rotor after the first injection molding) of the present invention.

[0033] Reference numerals:

[0034] 11 - First mold; 111 - First mold base; 112 - First core; 113 - First slider; 1131 - Angle pin hole; 114 - Slide core; 12 - Second mold; 121 - Angle pin; 2 - Insert; 4 - Press tooling; 41 - Base; 42 - Positioning bracket; 421 - Bracket body; 422 - First groove; 423 - Second groove; 424 - Limiting part; 425 - Narrow neck area; 43 - Guide post; 44 - Punch; 6 - Impeller rotor; 61 - Annular groove; 62 - Thin wall; 63 - Alnico magnet. Detailed implementation manners

[0035] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0036] The following, in conjunction with the accompanying drawings, details the technical solutions provided by each embodiment of the present invention.

[0037] The component of the brushless electronic water pump - the impeller rotor needs to be injection molded twice during the production process: for the first injection molding, an Alnico magnet (ring shape) needs to be inlaid on its outer peripheral wall to obtain the injection molded part to be molded as shown in Figure 10 , and for the second injection molding, injection molding needs to be carried out on the basis of the injection molded part to be molded to wrap the Alnico magnet to prevent it from rusting and cracking, so as to obtain the impeller rotor as shown in Figure 3 and Figure 7 .

[0038] For the injection molding of PPS (polyphenylene sulfide), the mold temperature is required to be controlled between 120 and 160 degrees Celsius. To ensure the maximization of the material crystallization degree, obtain a high crystallization degree and a smooth product surface, and at the same time reduce the shrinkage after molding, the mold temperature should not be lower than 120 degrees Celsius; when the impeller rotor is injection-molded for the second time, the wall thickness (the gap between the outer surface of the alnico magnet and the inner wall of the insert) is only 0.5 - 0.6 mm (i.e., the thin wall 62), and the injection molding material needs to maintain a high fluidity, so the temperature at the molding part should reach 170 - 190 degrees Celsius; however, if the mold is maintained at such a high temperature through the heating system of the injection molding machine, the overall mold base, guide pillars and bushings, and each transmission component are affected to varying degrees, and the heating system of the injection molding machine is also difficult to ensure the temperature required at the molding part (at the thin wall 62), and normal and stable production cannot be carried out.

[0039] In summary, referring to Figures 1 to 10 As shown, an injection molding device for the impeller rotor of an electronic water pump provided by an embodiment of the present invention includes an injection molding machine, a mold, an insert 2, an oven, and a press tooling 4.

[0040] The mold is installed on the injection molding machine and has a first mold 11 and a second mold 12 for injection molding of the to-be-injection-molded part; during the injection molding process, the first mold 11 and the second mold 12 are controlled at a first temperature, and the first temperature here is realized by the temperature control module (i.e., the heating system of the injection molding machine) in the existing injection molding machine to ensure the fluidity of the plastic particles in the mold runner. In some practical applications, the first mold 11 is a moving mold and the second mold 12 is a fixed mold.

[0041] The insert 2 is detachably arranged on the second mold 12 and, after the mold is closed, cooperates with the first mold 11, the second mold 12, and the to-be-injection-molded part placed on the first mold 11 to form an injection molding cavity; during the injection molding process, the molding part of the cavity is controlled at a second temperature, so that the injection molding material (such as polyphenylene sulfide containing 40% glass fiber) can flow in the cavity with a 0.5 - 0.6 mm gap (the gap between the outer surface of the alnico magnet and the inner wall of the insert), wherein the first temperature is lower than the second temperature (in some practical applications, the first temperature is 120 - 160 degrees Celsius and the second temperature is 170 - 190 degrees Celsius); after injection molding and mold opening, the insert 2 coaxially covers the injection-molded impeller rotor 6 and disengages from the contact with the second mold 12; the oven is arranged beside the injection molding machine for heating the insert 2; the press tooling 4 is arranged beside the injection molding machine for separating the insert 2 and the injection-molded impeller rotor 6.

[0042] In actual use, first place the insert 2 in an oven for heating until the insert 2 reaches the temperature set by the oven (in some practical applications, this set temperature is 190 degrees Celsius) to ensure the temperature at the molding location during the injection molding process. At the same time, ensure that the first mold 11 and the second mold 12 of the mold are in normal condition, and the temperature control module controls the first mold 11 and the second mold 12 at the first temperature.

[0043] Subsequently, install the heated insert 2 on the second mold 12. Place the part to be injection molded on the first mold 11 and prepare for mold closing and injection molding. The first mold 11 and the second mold 12 perform the mold closing operation, and the insert 2 cooperates with the first mold 11, the second mold 12, and the part to be injection molded placed on the first mold 11 to form an injection molding cavity. Since the insert 2 has been heated to 190 degrees Celsius in the oven, after mold closing, the temperature at the molding location can basically reach 180 degrees Celsius (considering the temperature reduction caused by heat transfer during the process of taking the insert out of the oven and mold closing), ensuring that polyphenylene sulfide containing 40% glass fiber has good fluidity in the cavity with a 0.5 - 0.6 mm gap, completing the injection molding, and enabling the impeller rotor to have a thin wall 62 with a thickness of 0.5 - 0.6 mm, which not only meets the assembly requirements of the impeller rotor and the stator core but also meets the requirement for the impeller rotor to operate stably between - 40 degrees and 120 degrees.

[0044] After injection molding is completed, the first mold 11 and the second mold 12 are opened. At this time, the insert 2 coaxially covers the injection - molded impeller rotor 6 and disengages from the second mold 12. Use the press tooling 4 set beside the injection molding machine to separate the insert 2 and the injection - molded impeller rotor 6 to obtain the final impeller rotor 6 product.

[0045] By heating the insert 2 in an oven and then placing it on the second mold 12, using the heated insert 2 as one of the components for forming the injection molding cavity, the temperature at the molding location can be controlled at the second temperature. That is, the insert 2 that can be separated from the mold serves both as one of the components for forming the injection molding cavity and as the core component for controlling the temperature at the molding location. Even if the gap between the outer surface of the alnico magnet and the inner wall of the insert 2 is only 0.5 - 0.6 mm, it can ensure that the injection molding material has high fluidity, thereby obtaining a product with a high degree of crystallization and a smooth surface.

[0046] In addition, the heating system of the injection molding machine controls the overall temperature of the mold at the first temperature, and the insert 2 controls the temperature at the molding location at the second temperature, achieving different temperatures at different parts. This can not only avoid the problem that the overall mold stays at the high temperature of the second temperature, resulting in varying degrees of influence on the overall mold base, guide pillars and bushings, and various transmission components, but also avoid the problem that the overall mold stays at the first temperature (the temperature at the molding location is also at the first temperature), resulting in poor fluidity of the injection molding material and inability to fully fill.

[0047] In some practical applications, there are at least two inserts 2, at least one of which is heated in the oven and at least one is used for injection molding in the mold. After the insert 2 participating in the molding is separated from the impeller rotor 6 after injection molding, the insert 2 originally in the oven is taken out and placed on the second mold 12 for the next molding operation. At the same time, the insert 2 that participated in the previous molding and was separated from the impeller rotor 6 after injection molding is put into the oven for heating. By operating in this way alternately, the production efficiency is greatly improved. In the actual production process, most molds can complete the processing of two products in one injection process. Therefore, at least four inserts 2 need to be prepared; while two inserts 2 are being heated in the oven, the other two inserts 2 participate in the molding operation.

[0048] In some practical applications, referring to Figures 2 to 7 , and Figure 10 As shown, since the impeller rotor 6 is a rotary circular part and has an annular groove 61 at the neck of the impeller rotor 6, the first mold 11 is optimized as follows: The first mold 11 includes a first mold base 111, a first mold core 112, a first slider 113, and a slider core 114. The first mold core 112 is arranged on the first mold base 111; the first slider 113 is slidably arranged on the first mold core 112; the slider core 114 is connected or integrally formed on the first slider 113; in the closed mold state, the slider core 114 cooperates with the insert 2, the second mold 12, and the part to be injection molded placed on the first mold 11 to form an injection cavity. In the closed mold state after injection molding, the slider core 114 is embedded in the annular groove 61 at the neck of the injection molded impeller rotor 6. Generally speaking, there are two relatively arranged sliders, so there are also two slider cores 114. In the closed mold state, the two slider cores 114 are stuck in the annular groove 61 to prevent the injection material from flowing into the annular groove 61.

[0049] Specifically, the design of the first slider 113 and the slider core 114 here can refer to the prior art (in many mold designs, products often have lateral holes, grooves, or protrusions and other structures, and lateral parting or core pulling operations are required during mold opening to smoothly remove the products. The inclined guide rod pushes the slider to open, enabling the slider to move along a specific path, thereby realizing the lateral parting or core pulling action and separating the product from the lateral part of the mold to avoid damaging the product during demolding). Generally speaking, there are at least two sliders on a mold; as shown in the figure, the first mold 11 has at least two relatively arranged first sliders 113. The first slider 113 is provided with an inclined guide post hole 1131 extending obliquely. The second mold 12 has a corresponding inclined guide post 121. Through the sliding fit of the inclined guide post and the inclined guide post hole, when the first mold 11 and the second mold 12 are opened, the two first sliders 113 can be driven to move away from each other to facilitate the removal of the insert 2 and the injection molded impeller rotor 6.

[0050] In some practical applications, since the impeller rotor 6 is a rotary circular part, on the one hand, the length of the thin-wall 62 is relatively long (generally up to about 40 mm) and the thickness is relatively thin (about 0.5 - 0.6 mm). On the other hand, the slider core 114 is embedded in the annular groove 61 at the neck of the impeller rotor 6 after injection molding. After the injection molding is completed, if the injection-molded impeller rotor 6 mold is directly separated by the mold-opening actions of the first mold 11 and the second mold 12, the formed impeller rotor 6 is likely to be broken at the thin-wall 62 and the annular groove 61 (the force during the mold-opening process is relatively difficult to control, and the product is completely pulled out of the mold by the thin plastic wall). Therefore, the detachable design of the insert 2 and the second mold 12 (a transition fit is adopted between the insert and the second mold, so that the insert 2 is easy to place on the second mold and also easy to remove from the second mold) can avoid this problem. That is, after the mold is demolded, the insert 2 still sleeves outside the thin-wall 62 of the impeller rotor 6. At this time, the staff can take down the insert 2 and the impeller rotor 6 together, and then use the above-mentioned press tooling 4 to separate the two.

[0051] According to the above problems, the structural design of the press tooling 4 is as follows: Refer to Figures 8 to 9 As shown, the press tooling 4 includes a base 41, a positioning bracket 42, a guide post 43, and a punch 44.

[0052] The positioning bracket 42 is arranged on the base 41 and is used to place the insert 2 to be separated and the injection-molded impeller rotor 6; the guide post 43 is arranged on the base 41; the punch 44 is slidably arranged on the guide post 43 and can move relative to the positioning bracket 42 to separate the insert 2 and the injection-molded impeller rotor 6.

[0053] Specifically, the positioning bracket 42 includes a bracket body 421 and two slots (the first slot 422 and the second slot 423 respectively). The bracket body 421 is arranged on the base 41; the first slot 422 is located at the upper part of the bracket body 421; the second slot 423 is located at the lower part of the bracket body 421; the limiting part 424 is located between the first slot 422 and the second slot 423, so as to form a U-shaped narrow-neck area 425 at the junction of the first slot 422 and the second slot 423, and the width of this narrow-neck area 425 is greater than the inner diameter of the insert 2 and less than the outer diameter of the insert 2; when the insert 2 to be separated and the injection-molded impeller rotor 6 are placed on the positioning bracket 42, the insert 2 is coaxial with the punch 44, the impeller part of the impeller rotor 6 is located in the second slot 423, the upper end face of the limiting part 424 abuts against the lower end face of the insert 2, and there is a gap between the end of the limiting part 424 and the bottom wall of the annular groove 61 at the neck of the impeller rotor 6 (the setting of this gap facilitates the insertion or sliding of the impeller rotor 6 onto this limiting part 424).

[0054] The size of the punch 44 is generally slightly smaller than the inner diameter of the insert 2 and is adapted to the size of the end of the impeller rotor 6. By controlling the descent of the punch 44, it can act on the end of the impeller rotor. Since the insert 2 is limited on the limiting part 424, the impeller rotor will fall off from the insert 2 under the action of the punch 44, thus realizing the separation of the two. During this process, since the impeller rotor is not restricted and limited by the first mold 11 and the second mold 12, it will not be pulled and broken.

[0055] An injection molding method for the impeller rotor of an electronic water pump, which uses the injection molding device described above for injection molding, includes the following steps:

[0056] S1: Turn on the injection molding machine, control the temperatures of the first mold 11 and the second mold 12 at the first temperature, and place the part to be injection molded in the first mold 11 of the mold;

[0057] S2: Turn on the oven, place the insert 2 in the oven for heating, and place the heated insert 2 in the second mold 12 of the mold, so that the cavity forming part is controlled at the second temperature;

[0058] S3: Close the first mold 11 and the second mold 12, so that the insert 2 cooperates with the first mold 11, the second mold 12, and the part to be injection molded placed on the first mold 11 to form an injection molding cavity; inject into the cavity, so that the injection molding material can flow in the cavity with a gap of 0.5 - 0.6 mm;

[0059] S4: After injection molding, open the mold, so that the insert 2 is coaxially coated outside the injection molded impeller rotor 6 and is separated from the contact with the second mold 12;

[0060] S6: Remove the insert 2 and the injection molded impeller rotor 6 from the first mold 11, place them on the press tooling 4, separate the insert 2 and the injection molded impeller rotor 6, and the obtained impeller rotor 6 has a thin wall 62 with a thickness of 0.5 - 0.6 mm.

[0061] In addition, it should be noted that there are at least two inserts 2, at least one of which is heated in the oven and at least one is used for injection molding.

[0062] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An impeller rotor injection molding device for an electronic water pump, characterized in that: It comprises an injection molding machine, a mold, an insert (2), an oven and a press tooling (4), wherein: A mold, mounted on an injection molding machine, comprising a first mold (11) and a second mold (12), for injection molding a part to be molded; during the injection molding process, the first mold (11) and the second mold (12) are controlled at a first temperature; The insert (2) is detachably arranged on the second mold (12), and cooperates with the first mold (11), the second mold (12), and the part to be injected placed on the first mold (11) to form an injection molding cavity after the molds are closed; during the injection molding process, the molding part of the cavity is controlled at a second temperature so that the injection molding material can flow in the cavity with a gap of 0.5-0.6 mm; after the injection molding and the mold opening, the insert (2) coaxially covers the outside of the injection molded impeller rotor (6) and is separated from the contact with the second mold (12); An oven, arranged beside the injection molding machine, for heating the insert (2); A press tool (4) is arranged beside the injection molding machine and is used to separate the insert (2) from the impeller rotor (6) after injection molding; The first temperature is lower than the second temperature.

2. The impeller rotor injection molding device of the electronic water pump according to claim 1, characterized in that: The first temperature is 120-160 degrees Celsius, and the second temperature is 170-190 degrees Celsius.

3. The impeller rotor injection molding device of the electronic water pump according to claim 1, characterized in that: There are at least two inserts (2), at least one of which is located in an oven for heating, and at least one is located in the mold for injection molding.

4. The impeller rotor injection molding device for an electronic water pump according to claim 1, characterized in that: The injection molding material is polyphenylene sulfide containing 40% glass fiber.

5. The impeller rotor injection molding device for an electronic water pump according to claim 1, characterized in that: The first mold (11) comprises: A first mold frame (111); A first mold core (112) is disposed on the first mold frame (111); A first sliding block (113) is slidably disposed on the first mold core (112); The slider core (114) is connected to or integrally formed on the first slider (113); in a mold-closing state, the slider core (114) cooperates with the insert (2), the second mold (12), and the part to be molded placed on the first mold (11) to form a mold cavity for injection molding.

6. The impeller rotor injection molding device for an electronic water pump according to claim 5, characterized in that: In a mold-closing state after injection molding, the slider core (114) is embedded in the annular groove (61) of the neck of the injection-molded impeller rotor (6).

7. The impeller rotor injection molding device for an electronic water pump according to claim 1, characterized in that: The press tooling (4) comprises: Base (41); A positioning bracket (42) is arranged on the base (41) and is used to place the insert (2) to be separated and the impeller rotor (6) after injection molding; A guide column (43) is disposed on the base (41); The punch (44) is slidably disposed on the guide column (43) and is capable of moving relative to the positioning bracket (42) so as to separate the insert (2) and the impeller rotor (6) after injection molding.

8. The impeller rotor injection molding device for an electronic water pump according to claim 7, characterized in that: The positioning bracket (42) comprises: A support body (421) is disposed on the base (41); A first groove (422) is located on the upper portion of the bracket body (421); A second groove (423) is located at the lower part of the bracket body (421); The limiting portion (424) is located between the first groove (422) and the second groove (423), so that a U-shaped narrow neck region (425) is formed at the junction of the first groove (422) and the second groove (423), and the width of the narrow neck region (425) is greater than the inner diameter of the insert (2) and smaller than the outer diameter of the insert (2); When the insert (2) to be separated and the impeller rotor (6) after injection molding are placed on the positioning bracket (42), the insert (2) and the punch (44) are coaxial, the impeller portion of the impeller rotor (6) is located in the second groove (423), the upper end surface of the limiting portion (424) abuts against the lower end surface of the insert (2), and a gap is left between the end of the limiting portion (424) and the bottom wall of the annular groove (61) of the neck of the impeller rotor (6).

9. A method for injection molding an impeller rotor of an electronic water pump, characterized in that: The injection molding device according to any one of claims 1 to 8 is used for injection molding, comprising: Starting the injection molding machine, controlling the temperature of the first mold (11) and the second mold (12) to a first temperature, and placing the part to be injection molded in the first mold (11) of the mold; Turning on the oven, placing the insert (2) in the oven for heating, and placing the heated insert (2) in the second mold (12) of the mold, so that the cavity molding portion is controlled at the second temperature; The first mold (11) and the second mold (12) are combined so that the insert (2) cooperates with the first mold (11), the second mold (12), and the part to be molded placed on the first mold (11) to form a mold cavity for injection molding; and injection molding is performed into the mold cavity so that the injection molding material can flow in the mold cavity with a gap of 0.5-0.6 mm; After the injection molding, the mold is opened so that the insert (2) coaxially covers the outside of the injection molded impeller rotor (6) and is separated from the contact with the second mold (12); The insert (2) and the injection-molded impeller rotor (6) are removed from the first mold (11), placed on a press tooling (4), and the insert (2) and the injection-molded impeller rotor (6) are separated.

10. The method for injection molding an impeller rotor of an electronic water pump according to claim 9, characterized in that: There are at least two inserts (2), at least one of which is located in an oven for heating, and at least one is used for injection molding.

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