Intermediate plate injection molding assembly, pump body, and preparation method of intermediate plate injection molding assembly

Abstract

The present invention discloses an intermediate plate injection molding assembly, a pump body, and a method for preparing the intermediate plate injection molding assembly, which relates to the technical field of pump body sealing. The intermediate plate injection molding assembly includes a main body and an annular sealing portion. A mating surface is formed on one side of the main body along its thickness direction. The material of the annular sealing portion is set to be a thermoplastic elastomer. The annular sealing portion is arranged on the mating surface and is integrally arranged with the main body. The annular sealing portion is used to tightly fit with external parts. The main body plays a supporting function, and the annular sealing portion tightly fits with external parts, thereby meeting the functional requirements of the intermediate plate injection molding assembly in the pump body. Compared with silicone materials, thermoplastic elastomers have the advantages of low cost and light weight, and can be integrally formed with hard plastics through injection molding. The sealing structure does not adopt a spherical seal consistent with the silicone sealing ring, but uses a groove-shaped seal, thereby being able to replace the existing silicone sealing ring combination structure, saving material costs and reducing turnover and assembly processes.

Description

Technical Field

[0001] The present invention relates to the technical field of pump body sealing, in particular to an intermediate plate injection molding component, a pump body and a preparation method of the intermediate plate injection molding component. Background Art

[0002] The design of the injection-molded intermediate plate assembly is often closely tied to the pump's structural type and operational requirements. The intermediate plate forms a seal with other pump components (such as the housing and cover) through end-face contact, preventing leakage of high-pressure fluid and thus separating high- and low-pressure zones. Existing injection-molded intermediate plate assemblies typically incorporate silicone sealing rings for sealing, and are assembled manually during production.

[0003] Due to the structure of the pump chambers, the center plate is typically irregularly shaped, potentially forming three or four petals depending on the number of chambers. Consequently, the silicone seals are also irregularly shaped. This type of seal is costly, difficult to install, and prone to falling off. Furthermore, because silicone requires vulcanization and molding, the process is long and energy-intensive. Summary of the Invention

[0004] The main purpose of the present invention is to propose a method for preparing an intermediate plate injection molding assembly, a pump body and an intermediate plate injection molding assembly, by making a thermoplastic elastomer and a hard plastic into an integrated structure, thereby replacing the existing silicone sealing ring combination structure, and based on the change of the material, adjusting the sealing matching structure at the same time, so as to adapt to the material properties to ensure the sealing requirements, save material costs, reduce turnover and assembly processes, and improve processing efficiency.

[0005] To achieve the above objectives, the present invention provides an intermediate plate injection molding assembly, comprising:

[0006] a main body, wherein a mating surface is formed on one side of the main body along a thickness direction thereof; and

[0007] An annular sealing portion, the material of which is set to be a thermoplastic elastomer, the annular sealing portion is arranged on the mating surface, and is injection molded integrally with the main body, the end surface of the annular sealing portion is concavely provided with a mating groove, the width of the mating groove is gradually expanded in the direction away from the bottom of the groove, and the annular sealing portion is used to tightly fit with external parts.

[0008] In one embodiment, the groove wall of the matching groove includes a bottom wall and two side walls provided on opposite sides of the bottom wall, and the two side walls are provided to be inclined outwards in a direction away from the bottom wall.

[0009] In one embodiment, the mating surface is concavely provided with a plurality of receiving grooves, and the plurality of receiving grooves include:

[0010] A first receiving groove is located in the middle of the main body;

[0011] a second receiving groove, arranged in an annular shape, located outside the first receiving groove and at an edge of the main body; and

[0012] The annular sealing portion is correspondingly arranged in the first accommodating groove and the second accommodating groove.

[0013] In one embodiment, a third accommodating groove is further recessed on the mating surface. The third accommodating groove is elongated and located between the first accommodating groove and the second accommodating groove, and connects the first accommodating groove and the second accommodating groove. The third accommodating groove is filled with a thermoplastic elastomer.

[0014] In one embodiment, the third receiving groove is used to correspond to the injection port of the injection molding equipment;

[0015] At least two fourth accommodating grooves are provided on the main body, and the two fourth accommodating grooves are correspondingly connected to the first accommodating groove and the second accommodating groove, and each of the fourth accommodating grooves is located on a side of the first accommodating groove away from the third accommodating groove.

[0016] In one embodiment, the width of each of the fourth receiving grooves is gradually expanded along the direction from the groove opening to the groove bottom.

[0017] In one embodiment, the first accommodating groove, the second accommodating groove, the third accommodating groove, and the fourth accommodating groove, which are connected to each other, are integrally injection molded to obtain the annular sealing portion.

[0018] In one embodiment, a first limiting groove is formed at the bottom of the first receiving groove to accommodate part of the annular sealing portion; and / or,

[0019] The width of the first accommodating groove is gradually expanded in a direction away from the groove bottom.

[0020] In one embodiment, the outwardly disposed groove wall of the second accommodating groove is through-set, and the side of the second accommodating groove facing the first accommodating groove is recessed with a plurality of second limiting grooves arranged along its circumference, and the groove width of each second limiting groove is gradually expanded from the groove mouth to the groove bottom, and the plurality of second limiting grooves are used to partially accommodate the annular sealing portion.

[0021] In one embodiment, a limiting protrusion is provided on the bottom of the second receiving groove to be embedded and matched with the annular sealing portion.

[0022] In one embodiment, the limiting protrusion has two opposite limiting side surfaces, one of the limiting side surfaces is recessed with a plurality of first grooves, and the other limiting side surface is recessed with a plurality of second grooves, and the plurality of first grooves and the plurality of second grooves are alternately arranged along the circumference of the second accommodating groove.

[0023] In one embodiment, the mating surface is provided with a recessed receiving groove, and the annular sealing portion is correspondingly provided in the receiving groove;

[0024] A sink groove is also formed on the mating surface, and the sink groove is communicated with the accommodating groove to form a step surface on at least one side of the accommodating groove, and the step surface is used to abut against the mating portion of the mold base on the injection molding equipment.

[0025] In one embodiment, the width of the step surface is d, and d≥0.1 mm.

[0026] The present invention also proposes a pump body, including the above-mentioned intermediate plate injection molding assembly, the intermediate plate injection molding assembly includes a main body and an annular sealing part, the main body is formed with a mating surface on one side along its thickness direction; the material of the annular sealing part is set to be a thermoplastic elastomer, the annular sealing part is arranged on the mating surface, and is integrally arranged with the main body, and the annular sealing part is used to tightly fit with external parts.

[0027] The present invention also provides a method for preparing an intermediate plate injection molding assembly, which is used to prepare the above-mentioned intermediate plate injection molding assembly, wherein the intermediate plate injection molding assembly includes a main body and an annular sealing portion, wherein the main body is formed with a mating surface on one side along the thickness direction thereof; the material of the annular sealing portion is set to be a thermoplastic elastomer, the annular sealing portion is arranged on the mating surface, and is integrally provided with the main body, the annular sealing portion is used to tightly fit with an external part, the mating surface of the main body is concavely provided with a receiving groove, the annular sealing portion is correspondingly arranged in the receiving groove, and a sunken groove is further formed on the mating surface, the sunken groove is connected to the receiving groove to form a step surface on at least one side of the receiving groove, and the step surface is used to abut against the mating portion of the mold base on the injection molding equipment;

[0028] The preparation method of the intermediate plate injection molding component comprises the following steps:

[0029] The main body is formed, wherein the main body has a plurality of receiving grooves, and a step surface is formed on the side of each receiving groove;

[0030] A plurality of stepped surfaces above the main body are aligned with a portion of a mold base of the mold so that the plurality of receiving grooves and the mold cavity of the mold base jointly define an injection cavity;

[0031] A soft rubber material of a thermoplastic elastomer is injected into the injection cavity to form an annular sealing portion integrally formed with the main body.

[0032] In the technical solution of the present invention, the annular sealing portion is formed by integrally injection-molding a thermoplastic elastomer and the surface of the main body. The main body plays a supporting role, and the annular sealing portion is tightly fitted with external parts, thereby meeting the functional requirements of the intermediate plate injection molding assembly in the pump body. Compared with silicone materials, thermoplastic elastomers have the advantages of low cost, high processing efficiency, recyclability, and lightweight. They can be integrally molded with hard plastics through injection molding to ensure connection strength and reduce assembly steps. In view of the material characteristics of the annular sealing portion, the sealing is not done by using a spherical seal consistent with the silicone sealing ring, but by using a groove-shaped seal to ensure the sealing effect. This structure can replace the existing silicone sealing ring combination structure, which can not only meet performance requirements, but also save material costs, reduce turnover and assembly processes, and improve processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 the structures shown in these drawings without paying any creative work.

[0034] Figure 1 This is a three-dimensional exploded schematic diagram of an embodiment of a pump body provided by the present invention;

[0035] Figure 2 for Figure 1 A cross-sectional diagram of the fit between the middle body and the upper shell;

[0036] Figure 3 for Figure 1 Schematic diagram of the structure of the middle plate injection molding assembly;

[0037] Figure 4 for Figure 3 Schematic diagram of the structure of the main body;

[0038] Figure 5 for Figure 3 A partial cross-sectional diagram of the middle annular sealing portion;

[0039] Figure 6 for Figure 3 Schematic diagram of the structure of the middle annular sealing part and the connecting part;

[0040] Figure 7 A schematic flow chart of the method for preparing the intermediate plate injection molding assembly provided by the present invention.

[0041] Description of Figure Numbers:

[0042] 1000, pump body; 100, middle plate injection molding assembly; 1, main body; 11, mating surface; 12, first accommodating groove; 121, first limiting groove; 13, second accommodating groove; 131, second limiting groove; 132, limiting protrusion; 1321, first groove; 1322, second groove; 14, third accommodating groove; 15, fourth accommodating groove; 16, step surface; 2, annular sealing portion; 21, mating groove; 211, bottom wall; 212, side wall; 3, connecting portion; 200, upper shell; 300, lower shell.

[0043] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] It should be noted that if a directional indication is involved in the embodiment of the present invention, the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] The design of the injection-molded intermediate plate assembly is often closely tied to the pump's structural type and operational requirements. The intermediate plate forms a seal with other pump components (such as the housing and cover) through end-face contact, preventing leakage of high-pressure fluids. This effectively separates high- and low-pressure zones and ensures pressure gradient control from intake to discharge. Existing injection-molded intermediate plate assemblies typically incorporate silicone sealing rings for sealing, and are assembled manually during production.

[0048] Currently, the middle plate body and the silicone sealing ring are produced separately and then assembled manually. Due to the structure of the pump chamber, the middle plate is generally irregularly shaped, with three petals, four petals, etc. depending on the number of chambers. Therefore, the silicone sealing ring is also irregularly shaped. This irregularly shaped sealing ring is expensive, difficult to install, and easy to fall off.

[0049] Some products can achieve integrated molding of liquid silicone and hard plastic through a special silicone two-component machine, reducing the number of assembly steps. However, since silicone needs to be vulcanized for molding, there are still problems such as long cycle time, high energy consumption, and high processing fees. Therefore, this technology is only used for some products with higher added value.

[0050] The present invention provides an intermediate plate injection molding assembly, a pump body, and a preparation method for the intermediate plate injection molding assembly, which enables a thermoplastic elastomer (TPE) with ordinary performance to be integrally molded with a hard plastic to replace a silicone sealing ring for sealing, and can meet test requirements such as pressure resistance, burst resistance, water hammer resistance, high and low temperature impact, life testing, and whole machine testing, thereby saving back-end turnover and assembly processes, reducing material costs, and improving processing efficiency.

[0051] Please refer to Figures 1 to 3 The middle plate injection molding component 100 includes a main body 1 and an annular sealing portion 2. The main body 1 is formed with a mating surface 11 on one side along its thickness direction. The material of the annular sealing portion 2 is set to be a thermoplastic elastomer. The annular sealing portion 2 is arranged on the mating surface 11 and is integrally injection molded with the main body 1. The annular sealing portion 2 is used to tightly fit with external parts.

[0052] In the technical solution of the present invention, the annular sealing portion 2 is formed by integrally injection molding a thermoplastic elastomer and the surface of the main body 1. The main body 1 plays a supporting role, and the annular sealing portion 2 is tightly fitted with external parts, thereby being able to meet the functional requirements of the intermediate plate injection molding assembly 100 in the pump body 1000. Compared with silicone materials, thermoplastic elastomers have the advantages of low cost, high processing efficiency, recyclability, and lightweight. They can be integrally molded with hard plastics through injection molding to ensure connection strength and reduce assembly steps. In view of the material properties of the annular sealing portion 2, in terms of sealing cooperation, a spherical seal consistent with a silicone sealing ring is not adopted, but a groove-shaped seal is used to ensure the sealing effect. This structure can replace the structure of the existing silicone sealing ring combination, which can not only meet performance requirements, but also save material costs, reduce turnover and assembly processes, and thus improve processing efficiency.

[0053] Since the compression set of thermoplastic elastomers is higher than that of silicone, the sealing performance may deteriorate after long-term compression. Therefore, a mating groove 21 is provided on the end surface of the annular sealing portion 2. This allows a portion of the external mating part to extend into the mating groove 21 and, through the pressure, deform the end surface of the annular sealing portion 2. This overcomes the defect that the sealing performance of thermoplastic elastomers may deteriorate after long-term compression.

[0054] Furthermore, the width of the mating groove 21 gradually expands away from its bottom. That is, the mating groove 21 is configured as a V-shape. This allows the annular sealing portion 2 to achieve its water-sealing function with minimal preload. During mating, the low preload on the annular sealing portion 2 compensates for the inherent high compression set of its material, thereby replacing the silicone seal to achieve the corresponding function. It should be noted that the inclination of the mating groove is determined by consideration of its mating sealing effect; both the inclination angle and the width of the bottom wall affect the performance of the sealing fit.

[0055] Please refer to Figure 5 The groove wall of the mating groove 21 includes a bottom wall 211 and two side walls 212 provided on opposite sides of the bottom wall 211. The two side walls 212 are arranged to be inclined outwardly in a direction away from the bottom wall 211. The "outward" here refers to the outside of the mating groove 21. That is, the cross-section of the mating groove 21 is an inverted trapezoid. By properly setting the inclination angle of the side walls 212 and the length of the bottom wall 211, the sealing effect of the contact and mating of the annular sealing portion 2 can be adjusted.

[0056] It should be noted that the annular sealing portion 2 can protrude from the main body 1 as a whole, so as to cooperate with external parts. Considering the molding process and the connection between the annular sealing portion 2 and the main body 1, a receiving groove is provided on the mating surface 11. The annular sealing portion 2 is formed by injecting corresponding materials into the receiving groove. Accordingly, the end of the annular sealing portion 2 can be flush with or lower than the receiving groove, and external parts can be inserted into the receiving groove to squeeze the annular sealing portion 2 to achieve sealing cooperation. Please refer to Figures 4 and 5 In this embodiment, the thickness direction of the main body 1 is the up and down direction, the lower part of the annular sealing part 2 is in the accommodating groove, and the upper part protrudes from the accommodating groove. Accordingly, the matching groove 21 is provided at the upper part of the annular sealing part 2.

[0057] Furthermore, the width of the upper portion of the annular sealing portion 2 is smaller than the width of the accommodating groove.

[0058] Moreover, in order to improve the sealing effect, the width of the upper portion of the annular sealing portion 2 is gradually reduced in the direction away from the lower portion thereof.

[0059] Considering the location of the intermediate plate injection molding assembly 100 in the pump body 1000, please refer to Figure 3 and Figure 4In some embodiments, the mating surface 11 is provided with a plurality of recessed receiving grooves, including a first receiving groove 12 and a second receiving groove 13. The first receiving groove 12 is annular and located in the middle of the main body 1; the second receiving groove 13 is annular and located around the first receiving groove 12 and at the edge of the main body 1. That is, the second receiving groove 13 and the first receiving groove 12 are nested and concentrically arranged, and the annular sealing portion 2 is correspondingly disposed in the first receiving groove 12 and the second receiving groove 13. This ensures that both the middle and outer edges of the intermediate plate injection molding assembly 100 can be sealed.

[0060] It should be understood that the shapes of the first receiving groove 12 and the second receiving groove 13 may be different. Figure 4 In the embodiment, the first accommodating groove 12 is arranged in a circular ring, and the second accommodating groove 13 is arranged in an irregular shape, and the contours of the two need to match the shape of the corresponding matching part of the upper shell 200 in the pump body 1000.

[0061] To facilitate injection molding, a third receiving groove 14 is also recessed on the mating surface 11. The third receiving groove 14 is elongated and located between the first receiving groove 12 and the second receiving groove 13, and is connected to the first receiving groove 12 and the second receiving groove 13. The third receiving groove 14 is filled with a thermoplastic elastomer, that is, the first receiving groove 12, the second receiving groove 13 and the third receiving groove 14 are connected to each other, so that all channels can be poured through a glue injection port during injection molding, which facilitates the simplified design of the injection mold. In the injection molding scenario, the glue can flow in the three connected receiving grooves, and the section of the annular sealing portion 2 formed in the third receiving groove 14 can serve as the connecting portion 3, which can ensure the connection strength.

[0062] It should be noted that the third receiving groove 14 is appropriately configured based on the shape of the main body 1. Its primary function is to connect the first receiving groove 12 and the second receiving groove 13, and it does not mate with external components. Therefore, in some embodiments, the third receiving groove 14 may be arranged in a stepped manner in the thickness direction of the main body 1 to match the height difference between the first receiving groove 12 and the second receiving groove 13. Furthermore, the upper end surface of the portion of the annular sealing portion 2 located within the third receiving groove 14 should be lower than the upper end surface of the portion of the annular sealing portion 2 located within the second receiving groove 13. This prevents the connecting portion 3 from partially lifting the upper shell 200, thereby creating a gap when the annular sealing portion 2 as a whole mates with the upper shell 200 and causing sealing failure.

[0063] Considering the integral molding process of the annular seal 2 and the main body 1, and to prevent product defects caused by material shortages, in some embodiments, the third receiving groove 14 corresponds to the injection port of the injection molding equipment. The main body 1 is provided with at least two fourth receiving grooves 15, each of which communicates with the first receiving groove 12 and the second receiving groove 13, and each fourth receiving groove 15 is located on the side of the first receiving groove 12 away from the third receiving groove 14. As the material flows from the injection port into the channel and diffuses along the channel path, the point opposite the injection port inevitably converges. Therefore, the position of the fourth receiving groove 15 is determined based on the position of the injection port, thereby shifting the end of the material flow from the receiving groove to the fourth receiving groove 15. This way, even if there is a material shortage at the end of the material flow, the formation of the annular seal 2 within the receiving groove will not be affected. Instead, the fourth receiving groove 15 will appear underfilled, without affecting the overall water sealing function of the structure. In injection molding scenarios, the provision of the fourth receiving groove 15 can prevent poor appearance and ensure the stability of the molded thermoplastic elastomer structure.

[0064] In this embodiment, the rubber material flows from the injection port into the third receiving groove 14, then flows along the two ends of the third receiving groove 14 into the first receiving groove 12 and the second receiving groove 13, respectively. Based on the annular structure of the first and second receiving grooves 12 and 13, the rubber material converges in two directions toward the locations of the two fourth receiving grooves 15, and finally completely fills the first receiving groove 12, the second receiving groove 13, and the fourth receiving groove. This reduces weld mark defects, improves product yield, and solves the problem of material shortage at the end of the material flow affecting sealing performance.

[0065] It should be noted that due to the volume difference between the first receiving tank 12 and the second receiving tank 13 , it can be set that the volume of the fourth receiving tank 15 connected to the first receiving tank 12 is larger than the volume of the fourth receiving tank 15 connected to the second receiving tank 13 .

[0066] Furthermore, the width of each fourth receiving groove 15 is gradually expanded from its opening to its bottom. Thus, after injection molding, it forms a mortise-and-tenon fit with the annular sealing portion 2, allowing the fourth receiving groove 15 to also serve a certain connection function, increasing the connection strength between the main body 1 and the annular sealing portion 2.

[0067] Based on the above embodiment, the plurality of receiving grooves, including the first receiving groove 12, the second receiving groove 13, the third receiving groove 14, and the fourth receiving groove 15, are interconnected, and the annular sealing portion 2 is obtained by integral injection molding. This ensures product structural stability, improves rubber material connection strength, and avoids poor product appearance in injection molding scenarios, thereby being able to replace silicone rings to meet the required functions.

[0068] The material of the main body 1 is generally a hard plastic that can be injection molded, such as polyhexamethylene adipamide (PA66). This material has good mechanical strength and hardness, as well as excellent heat resistance and corrosion resistance, and is insoluble in common solvents. Therefore, the main body 1 is incompatible with thermoplastic elastomers, and the adhesion between the two materials is weak. To prevent the annular sealing portion 2 from separating from the main body 1 after molding, in some embodiments, a first limiting groove 121 is recessed at the bottom of the first receiving groove 12 to partially accommodate the annular sealing portion 2. The first limiting groove 121 is also filled with rubber during injection molding, thereby increasing the contact area between the annular sealing portion 2 and the main body 1. After the rubber is thermoset, it expands and fills the gap, thereby improving the connection strength between the main body 1 and the annular sealing portion 2.

[0069] It should be noted that the width and depth of the first limiting groove 121 are not limited. The width of the first limiting groove 121 should be smaller than the width of the first accommodating groove 12, and the first limiting groove 121 can correspond to the center position of the annular sealing portion 2 or to the side of the annular sealing portion 2, that is, the first limiting groove 121 can be staggered with the matching groove 21. The depth of the first limiting groove 121 needs to be reasonably set according to the thickness of the main body 1 and the volume of the annular sealing portion 2, so that when the annular sealing portion 2 is deformed by the extrusion force, the corresponding part will not fall out of the first limiting groove 121.

[0070] In order to strengthen the connection strength between the annular seal portion 2 and the main body 1, in some embodiments, the width of the first receiving groove 12 is gradually expanded away from the bottom of the groove, thereby increasing the contact area between the annular seal portion 2 and the main body 1 and improving the friction between the two when they are tightly fitted.

[0071] Considering the installation position and functional requirements of the middle plate injection molding assembly 100, the outwardly facing groove wall of the second receiving groove 13 is set to be through, that is, the end and side of the annular sealing portion 2 in the second receiving groove 13 are sealed with external parts. Therefore, the connection between the annular sealing portion 2 and the second receiving groove 13 is more weak. Based on this, please refer to Figure 4 and Figure 6 The second accommodating groove 13 is recessed with a plurality of second limiting grooves 131 arranged along its circumferential direction on the side facing the first accommodating groove 12. The width of each second limiting groove 131 gradually expands from its groove opening to the groove bottom, that is, it gradually expands from the edge of the main body 1 to the center. The plurality of second limiting grooves 131 are provided to partially accommodate the annular sealing portion 2. After the annular sealing portion 2 is formed, it is partially filled into the second limiting grooves 131, thereby forming a mortise and tenon joint structure. The provision of the plurality of second limiting grooves 131 can increase the connection strength of the annular sealing portion 2 through multiple connection points in the circumferential direction, thereby ensuring that the annular sealing portion 2 is tightly connected to the main body 1 after forming and is not easily detached.

[0072] Based on the above embodiment, the fourth receiving groove 15 does not need to be provided separately. The position and size of the second limiting grooves 131 can be reasonably designed so that one of the second limiting grooves 131 can play the role of glue overflow.

[0073] Moreover, a limiting protrusion 132 is provided on the bottom of the second receiving groove 13 to fit in with the annular sealing portion 2. That is, the annular sealing portion 2 and the bottom of the second receiving groove 13 are concave-convex, thereby increasing the contact area and improving the connection strength.

[0074] It should be noted that the height of the limiting protrusion 132 should be correlated with the depth of the annular sealing part 2 in the second receiving groove 13, so as to avoid the structural strength of the annular sealing part 2 being affected by the excessive height of the limiting protrusion 132, causing the middle part of the annular sealing part 2 to be torn.

[0075] Based on the above examples, please refer to Figure 4 The limiting protrusion 132 has two opposing limiting side surfaces, one of which is recessed with a plurality of first grooves 1321, and the other is recessed with a plurality of second grooves 1322. The plurality of first grooves 1321 and the plurality of second grooves 1322 are alternately arranged along the circumference of the second receiving groove 13. The plurality of first grooves 1321 and the plurality of second grooves 1322 give the limiting protrusion 132 a concave-convex surface, thereby further improving the connection effect with the annular sealing portion 2.

[0076] It should be understood that the dimensions of the first groove 1321 and the second groove 1322 can be the same or different. For example, the dimension of the first groove 1321 in the circumferential direction of the limiting protrusion 132 is larger than the dimension of the second groove 1322 in the circumferential direction of the limiting protrusion 132. The shapes of the first groove 1321 and the second groove 1322 can be the same or different. For example, the first groove 1321 can be configured as an arc-shaped groove, and the second groove 1322 can be configured as a V-shaped groove.

[0077] In this embodiment, the first groove 1321 and the second groove 1322 are both configured as arc-shaped grooves, and have the same size.

[0078] In the case of two-material injection molding, the main body 1 and the annular sealing portion may be thermoset sequentially. After thermosetting, when the main body 1 is mated with the mold structure, if a gap is formed due to mold processing errors, liquid rubber will overflow from the gap. At the very least, this may cause burrs on the thermoplastic elastomer after molding, resulting in product appearance defects. At worst, it may cause partial material shortages in the product, resulting in product failure. In this embodiment, a receiving groove is recessed on the mating surface 11, and the annular sealing portion 2 is correspondingly disposed within the receiving groove. The mating surface 11 also has a recessed groove that communicates with the receiving groove to form a stepped surface 16 on at least one side of the receiving groove. The stepped surface 16 is designed to abut against the mating portion of the mold base on the injection molding equipment. In other words, the side of the molded annular sealing portion 2 has a flat annular surface that can mate with the mold, thereby achieving a sealed fit between the mold and the main body 1 through a flat seal. During molding, the sealing glue can be pre-pressed onto the stepped surface 16, thereby minimizing burrs and reducing dependence on mold processing accuracy.

[0079] It should be noted that if the mold and the side of the groove structure are matched through vertical sealing, the side sealing requires extremely high processing accuracy. If the reserved size of the material of the mold is large, it is easy to scratch the main body 1, and there is a possibility of material falling off. If the material of the mold and the reserved size are small, it is easy to produce gaps and then burrs. Therefore, flat sealing can achieve better results and reduce the precision requirements for the mold.

[0080] Specifically, the width of step surface 16 is d, d ≥ 0.1mm. Thermoplastic elastomers have a low overflow tolerance. If step surface 16 is too large, burrs will form. If it is too small, the mold will have difficulty abutting and fitting. Therefore, the sealing direction and the width of step surface 16 are limited to ensure product yield.

[0081] It should be noted that stepped surfaces 16 are formed on both opposing sides of the first receiving groove 12, and the second receiving groove 13 forms a stepped surface 16 on the side facing the first receiving groove 12. The upper portion of the annular sealing portion 2 can be located within the recessed groove or can protrude therefrom, depending on the actual design requirements, and the present invention does not impose any restrictions thereto.

[0082] Based on this, the embodiment of the present application provides a method for preparing an intermediate plate injection molding assembly 100. Figure 7 1 is a flow chart of a first embodiment of a method for preparing an intermediate plate injection molding assembly 100 of the present application.

[0083] In this embodiment, the preparation method of the intermediate plate injection molding assembly 100 specifically includes the following steps:

[0084] Step S10, forming a main body 1, wherein the main body 1 has a plurality of receiving grooves, and a step surface 16 is formed on the side of each receiving groove;

[0085] It should be understood that the molded main body 1 has a first accommodating groove 12 and a second accommodating groove 13, and the bottom of the first accommodating groove 12 forms a first limiting groove 121, and the side forms a fourth accommodating groove 15, the bottom of the second accommodating groove 13 forms a limiting protrusion 132, and the side forms multiple second limiting grooves 131, and the sides of the first accommodating groove 12 and the second accommodating groove 13 are both formed with a step surface 16.

[0086] It should be noted that, depending on different injection molds and injection molding processes, multiple receiving grooves can be independent of each other, and the filling of the rubber can be achieved by injecting glue through multiple injection ports. Alternatively, multiple receiving grooves on the molded main body 1 can be connected through the third receiving groove 14, so that injection molding can be achieved through one injection port, which requires a simpler structure for the mold.

[0087] Step S20: Aligning the plurality of stepped surfaces 16 above the main body 1 with corresponding portions of the mold base of the mold, so that the plurality of receiving grooves and the mold cavity of the mold base together define an injection cavity;

[0088] It should be understood that in the scenario of double-material injection molding, the primary injection main body 1 is first thermoset, and the thermoset-molded main body 1 cooperates with the mold base of the mold to define an injection cavity for secondary injection. When the main body 1 is thermoset and corresponds to the mold structure, it is necessary to ensure the sealing performance of the injection cavity, thereby ensuring the injection filling of the thermoplastic elastomer. The design of multiple step surfaces 16 can cooperate with the end face of the mold base to achieve flat sealing. This structural form has lower processing requirements for the mold and is easy to achieve sealing of the injection cavity, so that the sealing glue can be pre-pressed on the step surface 16 during the secondary injection molding, thereby minimizing the burr problem and reducing the dependence on the mold processing accuracy.

[0089] In step S30 , a soft rubber material of a thermoplastic elastomer is injected into the injection cavity to form an annular sealing portion 2 integrally formed with the main body 1 .

[0090] Liquid material is injected into the injection molding cavity, and the main body 1 and the annular sealing part 2 are obtained as an integral part through thermosetting molding. Compared with the existing technology of molding two parts separately and then assembling them, the finished parts can be obtained through injection molding, saving assembly steps.

[0091] The technical solution of the present invention is designed from multiple angles including material adjustment, processing and preparation method adjustment, and structural adjustment, thereby replacing the existing structure of a silicone ring and an intermediate plate, reducing costs, simplifying the process, and at the same time changing from a spherical seal to a V-shaped seal, which can achieve a water sealing function with a smaller pre-pressure.

[0092] The present invention also proposes a pump body 1000, which includes an intermediate plate injection molding assembly 100. The specific structure of the intermediate plate injection molding assembly 100 refers to the above-mentioned embodiment. Since the present pump body 1000 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0093] Please refer to Figures 1 to 2 The pump body 1000 includes an upper shell 200 and a lower shell 300. The main body 1 is installed on the lower shell 300 through a limiting matching structure. The annular sealing part 2 on the main body 1 is tightly pressed against the upper shell 200 to form a seal, thereby achieving the separation effect of high and low pressure areas.

[0094] The present invention does not limit the application scenarios of the pump body 1000. For example, the pump body 1000 can be installed in a water dispenser to provide driving, pressurizing, filtering, and circulating water within the dispenser. It can also be combined with a sealing design and intelligent control to meet the needs of different scenarios. The pump body 1000 can also be used in other scenarios, such as water heaters and drainage systems, and the present invention does not limit this.

[0095] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. An intermediate plate injection molding assembly for a pump body, characterized in that: include: a main body, wherein a mating surface is formed on one side of the main body along a thickness direction thereof; an annular sealing portion, wherein the material of the annular sealing portion is set to be a thermoplastic elastomer, the annular sealing portion is provided on the mating surface, and is integrally injection-molded with the main body. The end surface of the annular sealing portion is concavely provided with a mating groove, and the width of the mating groove is gradually expanded in a direction away from the groove bottom. The annular sealing portion is used to tightly mate with an external part; The mating surface is concavely provided with a plurality of receiving grooves, the plurality of receiving grooves including a first receiving groove and a second receiving groove, the first receiving groove being located in the middle of the main body, the second receiving groove being arranged in an annular shape, the second receiving groove being located on the periphery of the first receiving groove and on the edge of the main body, the annular sealing portion being correspondingly provided in the first receiving groove and the second receiving groove; The plurality of accommodating grooves further include a third accommodating groove, the third accommodating groove being located between the first accommodating groove and the second accommodating groove and communicating with the first accommodating groove and the second accommodating groove, the third accommodating groove being filled with a thermoplastic elastomer; The groove wall of the second accommodating groove is arranged outward and is set to be through-through. A limiting protrusion is convexly provided on the bottom of the second accommodating groove to be embedded and cooperated with the annular sealing portion. The limiting protrusion has two opposite limiting side surfaces, one of which is concavely provided with a plurality of first grooves, and the other is concavely provided with a plurality of second grooves. The plurality of first grooves and the plurality of second grooves are alternately arranged along the circumference of the second accommodating groove.

2. The intermediate plate injection molding assembly according to claim 1, wherein: The groove wall of the matching groove includes a bottom wall and two side walls arranged on two opposite sides of the bottom wall, and the two side walls are arranged to be inclined outwards in a direction away from the bottom wall.

3. The intermediate plate injection molding assembly according to claim 1, wherein: The third receiving groove is used to correspond to the injection port of the injection molding equipment; The multiple accommodating grooves also include at least two fourth accommodating grooves, one of which is connected to the first accommodating groove and is located on the side of the first accommodating groove away from the third accommodating groove, and the other of which is connected to the second accommodating groove and is located on the side of the first accommodating groove away from the third accommodating groove.

4. The intermediate plate injection molding assembly according to claim 3, characterized in that: The width of each of the fourth accommodating grooves is gradually expanded along the direction from the groove opening to the groove bottom.

5. The intermediate plate injection molding assembly according to claim 3, wherein: The first accommodating groove, the second accommodating groove, the third accommodating groove and the fourth accommodating groove which are communicated with each other are integrally injection-molded to obtain the annular sealing portion.

6. The intermediate plate injection molding assembly according to claim 1, wherein: A first limiting groove is formed at the bottom of the first accommodating groove to accommodate part of the annular sealing portion; and / or, The width of the first accommodating groove is gradually expanded in a direction away from the groove bottom.

7. The intermediate plate injection molding assembly according to claim 1, wherein: The second accommodating groove is recessed with a plurality of second limiting grooves arranged along its circumference on the side facing the first accommodating groove, and the width of each second limiting groove is gradually expanded from the groove mouth to the groove bottom, and the plurality of second limiting grooves are used to partially accommodate the annular sealing part.

8. The intermediate plate injection molding assembly according to claim 1, wherein: The mating surface is provided with a recessed receiving groove, and the annular sealing portion is correspondingly provided in the receiving groove; A sunken groove is further formed on the mating surface, and the sunken groove is communicated with the accommodating groove to form a step surface on the outside of the accommodating groove, and the step surface is used to abut against the mating portion of the mold base on the injection molding equipment.

9. The intermediate plate injection molding assembly according to claim 8, wherein: The width of the step surface is d, and d≥0.1 mm.

10. A pump body, characterized in that: The invention comprises the intermediate plate injection molding assembly according to any one of claims 1 to 9.

11. A method for preparing an intermediate plate injection molding assembly, for preparing the intermediate plate injection molding assembly according to any one of claims 1 to 9, characterized in that: The mating surface of the main body is concavely provided with an accommodating groove, the annular sealing portion is correspondingly provided in the accommodating groove, and a sunken groove is further formed on the mating surface, the sunken groove is communicated with the accommodating groove to form a step surface on the outer side of the accommodating groove, and the step surface is used to abut against the mating portion of the mold base on the injection molding equipment; The preparation method of the intermediate plate injection molding component comprises the following steps: Forming a main body, the main body having a plurality of receiving grooves, and the outer side of each receiving groove is formed with a step surface; A plurality of stepped surfaces above the main body are aligned with a portion of a mold base of the mold so that the plurality of receiving grooves and the mold cavity of the mold base jointly define an injection cavity; A soft rubber material of a thermoplastic elastomer is injected into the injection cavity to form an annular sealing portion integrally formed with the main body.

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