CN114833992A - Split type preparation process of electronic expansion valve coil and electronic expansion valve coil using split type preparation process - Google Patents

Split type preparation process of electronic expansion valve coil and electronic expansion valve coil using split type preparation process Download PDF

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Publication number
CN114833992A
CN114833992A CN202210552652.0A CN202210552652A CN114833992A CN 114833992 A CN114833992 A CN 114833992A CN 202210552652 A CN202210552652 A CN 202210552652A CN 114833992 A CN114833992 A CN 114833992A
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China
Prior art keywords
coil
electronic expansion
expansion valve
stator
shell
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CN202210552652.0A
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Chinese (zh)
Inventor
林宏华
张庆
周洋
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Anhui Aston Electric Co ltd
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Anhui Aston Electric Co ltd
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Priority to CN202210552652.0A priority Critical patent/CN114833992A/en
Publication of CN114833992A publication Critical patent/CN114833992A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/4005—Ejector constructions; Ejector operating mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C2045/14237—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The invention discloses a split type preparation process of an electronic expansion valve coil and the electronic expansion valve coil using the same, and belongs to the technical field of flow regulating valves. The method mainly comprises the split type technological process of preparing the coil shell, assembling the stator coil assembly, installing the wear-resistant support, installing the positioning element, welding the external wire harness, inserting the demoulding rod, filling glue, pulling out the demoulding rod and the like, and the electronic expansion valve coil prepared by the technological process. The invention realizes the full-automatic production of the electronic expansion valve coil, and conforms to the requirement of the era of intelligent manufacturing in continuous innovation; the invention has very important significance in the technical field of electronic expansion valves, the high-efficiency production mode creates considerable economic benefits for enterprises, and the high-efficiency utilization rate of resources saves precious resources for society.

Description

Split type preparation process of electronic expansion valve coil and electronic expansion valve coil using split type preparation process
Technical Field
The invention belongs to the technical field of flow regulating valves, and particularly relates to a split type preparation process of an electronic expansion valve coil and the electronic expansion valve coil using the same, which can greatly reduce the product rejection rate, obviously reduce the production cost, obviously save the purchasing resources, comprehensively realize automatic production, comply with the development requirements of the era of intelligent production and have wide application prospects.
Background
The electronic expansion valve is an important throttling device in a heat exchange system, particularly frequency conversion equipment, and the refrigeration equipment realizes the adjustment and control of the refrigeration flow through the electronic expansion valve. Besides the field of refrigeration equipment, the electronic expansion valve also has application in the field of gas appliances, and the electronic expansion valve is mainly used for adjusting and controlling the gas flow.
The electronic expansion valve comprises a valve body and an electronic expansion valve coil sleeved outside the valve body, wherein the electronic expansion valve coil is a driving source for the electronic expansion valve to work, a magnetic field generated by electrifying the electronic expansion valve coil is used for driving the valve body to act, and the electronic expansion valve coil is generally clamped on the valve body through a positioning element arranged on a shell of the electronic expansion valve coil.
At present, the most widely applied production method of the electronic expansion valve coil is a 'full-encapsulation' manufacturing method. Firstly, stator coil assemblies are assembled in advance, the stator coil assemblies are manually placed into an injection mold of an injection molding machine one by one, the stator coil assemblies are completely plastically packaged, and through the design of the structural shape of the mold, the plastic part which is subjected to injection molding comprises a shell of an electronic expansion valve coil, an inner filling encapsulating layer and a positioning element which is fixedly connected with a valve body.
The invention is a Chinese patent with an authorization publication number of CN 104514911B, an authorization publication date of 2017.05.03, and a name of an electronic expansion valve and a coil device thereof, which basically adopts the manufacturing method, mainly comprising a shell with an inner cavity and a positioning element connected with a valve body of the electronic expansion valve, wherein an injection molding channel is arranged on the shell, when the coil device is encapsulated, an injection molding material reaches the end face of the shell through the injection molding channel, and the positioning element is formed on the end face of the shell. In this way, the positioning element "can be injection molded integrally at the same time as the coil arrangement is encapsulated.
The production mode of 'full encapsulation' has the advantages of less working procedures and simple processing, but in the practical process, the traditional processing mode has great defects which are mainly reflected in the following two points:
first, the phenomena of material shortage, sand holes and the like are common injection molding defects in the injection molding process, and particularly, under the condition that the structure of a semi-finished product needing injection molding filling is complex, the circulation of injection molding raw materials is limited, and the probability of the occurrence of the injection molding defects is higher. For electronic expansion valve coils, once this occurs, the entire product is scrapped. Because the electronic expansion valve works in the outdoor environment, the rainwater weather cannot be avoided, if the coil of the electronic expansion valve is infiltrated with water, the coil can break down a short circuit, and the electronic expansion valve can lose efficacy, so that the whole operation system fails. Therefore, the coil windings of the electronic expansion valve need to be absolutely sealed.
The scrapping of the whole product means that the internal enameled wire winding, the internal stator shell, the internal electromagnetic polar plate and the plastic layer firmly encapsulated with the stator coil assembly are all scrapped, no matter which part or raw material can not be recycled, the waste of production resources is serious, and the production cost is high;
the second, "fully encapsulated" production method is very labor-dependent, and the assembled stator coil assembly must be manually placed into a mold. The mold for injection molding of the injection molding machine is divided into an upper mold and a lower mold, the upper mold and the lower mold are either transversely placed or longitudinally placed, and the upper mold and the lower mold are certainly oppositely arranged no matter the upper mold and the lower mold are placed in any direction; if the stator coil assembly is clamped automatically by the automation equipment in a mode of matching the vision system technology with the mechanical arm, the picture capturer of the vision system is required to be directly opposite to the upper die or the lower die, and the positioning is not accurate if the picture capturer is not opposite to the upper die or the lower die. In addition, the manipulator has certain requirements on the movement space, the space between the upper die and the lower die is not large after all, and the difficulty of flexibly moving and placing the manipulator in the narrow space can be imagined. Therefore, the conflict of the positions of the image capturers and the incapability of flexible movement of the manipulator in a narrow space determine that the fully-enclosed manufacturing mode can not realize full-automatic production. In the era of labor shortage nowadays, if full-automatic production cannot be realized, it is also a great trend that the manufacturing mode is supposed to be eliminated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the split type preparation process of the electronic expansion valve coil, which can greatly reduce the product rejection rate, obviously reduce the production cost, obviously save the purchasing resources, comprehensively realize the automatic production, comply with the development requirement of the intelligent production era and have wide application prospect, and the electronic expansion valve coil using the split type preparation process.
The invention is realized by the following technical scheme:
a split type preparation process for a coil of an electronic expansion valve comprises the following operation steps:
a. preparing a coil shell qualified for inspection in advance for standby;
b. assembling a stator coil assembly;
c. selecting and fixedly mounting a wear-resistant bracket on two end faces of the stator coil assembly; the wear-resistant bracket is provided with a bracket through hole for the valve body of the electronic expansion valve to penetrate through;
d. a positioning element matched with a mounting plate of the valve body of the electronic expansion valve is fixedly mounted on the stator coil assembly; the assembling end of the positioning element is opposite to the main body of the wear-resistant bracket;
e. welding an external wire harness on a lead pin led out of the stator coil assembly;
f. fitting the product of step e into the coil housing;
g. the inner wall of the demoulding rod is attached to the inner wall of the stator coil assembly and the inner wall of the coil shell top cap;
h. pouring a pouring sealant into the coil shell in the step g, wherein the poured pouring sealant does not exceed the top surface of the wear-resistant support, and the pouring sealant is not adhered to the demolding rod;
i. and d, after the pouring sealant in the step h is solidified, pulling out the demoulding rod, and finishing the processing of the electronic expansion valve coil.
Preferably, the stator coil assembly is formed by oppositely splicing two identical stator coils;
the upper stator coil comprises an upper stator shell, an upper coil winding which is fixed in the upper stator shell and provided with a guide pin, and an upper electromagnetic plate which is fixedly connected with the upper coil winding, wherein pawls on the upper electromagnetic plate and pawls on the upper stator shell are distributed in a staggered manner;
the lower stator coil comprises a lower stator shell, a lower coil winding which is fixed in the lower stator shell and provided with a guide pin, and a lower electromagnetic pole plate which is fixedly connected with the lower coil winding, wherein pawls on the lower electromagnetic pole plate and pawls on the lower stator shell are distributed in a staggered manner; the upper electromagnetic plate is also fixedly connected with the lower electromagnetic plate.
Preferably, the wear bracket body comprises an annular body and an annular boss protruding from the annular body.
Preferably, the annular body is further provided with a wear-resistant boss which keeps the same plane with the annular boss, and the assembling end of the positioning element in the step d is arranged opposite to the wear-resistant boss.
Preferably, the wear-resistant bracket is a hard plastic piece and fixedly connected with the stator coil assembly in an adhesive connection manner;
or the wear-resistant bracket is a metal piece and is fixedly connected with the stator coil assembly in a gluing or spot welding connection mode.
Preferably, the connecting end of the external wiring harness is directly electrically connected with the guide pin of the stator coil assembly by using an ultrasonic welding process.
Preferably, the demoulding rod in the step g is a reducing rod; the upper rod and the lower rod are arranged in the upper end of the coil shell, and the diameter of the upper rod is equal to that of the inner ring of the stator coil assembly and that of the inner ring of the top cap of the coil shell.
Preferably, the non-adhesion of the pouring sealant and the demolding rod is realized by spraying the nonstick coating on the demolding rod in the step g.
Preferably, the pouring sealant in the step h is polyurethane glue; and g, the demoulding rod is made of hard metal materials, and a Teflon non-stick coating is sprayed on the surface layer of the demoulding rod.
An electronic expansion valve coil using the split type preparation process of the electronic expansion valve coil.
Compared with the prior art, the invention has the beneficial effects that:
the invention has ingenious conception, simple process flow and easy operation, and changes the 'fully-encapsulated' manufacturing mode of the traditional electronic expansion valve coil by the production mode of matching the demoulding rod with the wear-resistant bracket; each production process can be completed through automatic equipment, so that full-automatic flow line production of the electronic expansion valve coil is realized, the continuity is high, the powerless state of labor shortage is greatly relieved, the production efficiency of products is greatly improved, and the investment cost of enterprises on human resources is also greatly reduced; the consistency of the product manufactured by the invention is good, and the product quality is stable and reliable;
the invention can achieve zero rejection rate; the traditional product is discarded mainly because the injection molding defect of the injection molding piece wrapping the stator coil assembly possibly exists in the injection molding process; the injection molding part is only a coil shell without a lining part, the injection molding is completed after the mold is closed, the mold is opened after the injection molding, and the coil shell automatically falls off; because the coil shell has a simple shape, the injection molding raw materials flow smoothly, and the quality problems of material shortage, sand holes and the like are not easy to occur, if any, the injection molding raw materials are directly removed and used as return materials for reutilization; the invention can realize zero rejection rate of products, has high resource utilization rate and obviously and greatly reduces purchasing cost;
the invention realizes the full-automatic production of the electronic expansion valve coil, and conforms to the requirement of the era of intelligent manufacturing in continuous innovation; the invention has very important significance in the technical field of electronic expansion valves, the high-efficiency production mode creates considerable economic benefits for enterprises, and the high-efficiency utilization rate of resources saves precious resources for the society.
Drawings
FIG. 1 is a side view schematic of the electronic expansion valve coil of the present invention;
FIG. 2 is a schematic perspective view of an electronic expansion valve coil according to the present invention;
FIG. 3 is a schematic view of the stator coil assembly and wear bracket assembly of the present invention in assembled configuration;
FIG. 4 is a cross-sectional view of a stator coil assembly and wear bracket assembly of the present invention as assembled;
FIG. 5 is a schematic view of the wear bracket of the present invention;
FIG. 6 is a schematic cross-sectional view of an electronic expansion valve coil of the present invention;
FIG. 7 is a schematic view of the structure of the electronic expansion valve coil of the present invention during insertion of a stripper bar during its manufacture;
FIG. 8 is a schematic cross-sectional view of a release rod inserted during the production of an electronic expansion valve coil in accordance with the present invention;
fig. 9 is a schematic structural view of the electronic expansion valve coil and the electronic expansion valve body of the present invention when pre-screwed and fastened.
In the figure: 1. a coil housing; 11. a coil housing top cap; 2. a stator coil assembly; 21. leading a needle; 211. a lower stator housing; 212. a lower coil winding; 213. a lower electromagnetic plate; 221. an upper stator housing; 222. an upper coil winding; 223. an upper electromagnetic plate; 3. a wear-resistant bracket; 31. an annular body; 32. an annular boss; 33. a wear-resistant boss; 34. a bracket through hole; 4. a valve body of the electronic expansion valve; 41. mounting a plate; 5. a positioning element; 51. an assembly end; 6. externally connecting a wire harness; 7. a stripping bar; 71. an upper rod; 72. a lower rod; 8. and (5) pouring a sealant.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
in order to make the reader understand the design spirit of the present invention better, the following description will explain the technical solutions of the present invention with reference to the embodiments. It should be noted that the following paragraphs may refer to terms of orientation, including but not limited to "upper, lower, left, right, front, rear" and the like, which are intended to correspond to the visual orientations shown in the drawings, and should not be construed as limiting the scope or spirit of the present invention, but merely as providing those skilled in the art with a better understanding of the technical aspects of the present invention.
In the description of the present specification, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1:
a split type preparation process for an electronic expansion valve coil comprises the following operation steps:
a. preparing the coil housing 1 qualified for inspection in advance for standby; the coil shell 1 is formed by injection molding of an injection molding machine, and the coil shell 1 which is detected to be unqualified is directly used as a return material for reutilization.
b. Assembling the stator coil assembly 2; the stator coil assemblies 2 are sequentially assembled by utilizing automatic equipment;
c. a wear-resistant bracket 3 is fixedly arranged on two end faces of the stator coil assembly 2; the wear-resistant bracket 3 is provided with a bracket through hole 34 for the electronic expansion valve body 4 to penetrate through; the wear-resistant bracket 3 is also fixed on the end face of the stator coil assembly 2 by using automatic equipment, and the outer diameter of the wear-resistant bracket 3 is preferably not larger than that of the stator coil assembly so as to prevent the subsequent glue filling speed from being influenced.
d. A positioning element 5 matched with the mounting plate 41 of the electronic expansion valve body 4 is fixedly mounted on the stator coil assembly 2; the fitting end 51 of the positioning element 5 is arranged opposite the body of the wear bracket 3; the positioning element 5 is fixedly connected with the side wall of the stator coil assembly 2 by using a welding robot. The main body of the wear-resistant bracket 3 refers to the wear-resistant bracket except for the bracket through hole 34.
e. An external wiring harness 6 is welded on a guide pin 21 led out from the stator coil assembly 2; the guide pin 21 can be connected with an external wiring harness through soldering after transition of a circuit board, and the external wiring harness 6 can be directly and electrically welded with the guide pin 21 through an ultrasonic welding process. During winding, the end of the enameled wire of the stator coil assembly 2 is wound on the guide pin 21 and is electrically connected with the guide pin 21 by soldering, so that the existing mature process is adopted, and the process is not repeated for avoiding complicated literary composition.
f. The product of step e is assembled into the coil housing 1. And (e) assembling a certain pretightening force between the product obtained in the step (e) and the coil shell 1 so as to prevent the product obtained in the step (e) and the coil shell 1 from relatively displacing when being transported on a conveyor belt.
g. The demoulding rod 7 is inserted, and the inner wall of the demoulding rod 7 is attached to the inner wall of the stator coil assembly 2 and the inner wall of the coil shell top cap 11; the demoulding rod plays a role in molding, a storage container with an upper end opening is formed in the coil shell except for the space occupied by the demoulding rod due to the existence of the demoulding rod, and the storage container is used for subsequent glue filling so as to ensure that a coil winding of the stator coil assembly can be completely sealed, and thus the product performance and the service life of the electronic expansion valve coil are ensured.
h. Pouring a pouring sealant 8 into the coil shell 1 in the step g, wherein the poured pouring sealant 8 does not exceed the top surface of the wear-resistant support 3, and the pouring sealant 8 is not adhered to the demolding rod 7; the pouring sealant 8 has good fluidity, but the existence of the demoulding rod enables the glue to only flow into the flowing space, and the pouring sealant 8 is not bonded with the demoulding rod 7, so that the demoulding rod 7 is ensured to be smoothly separated. The top surface of the wear-resistant bracket is the uppermost plane of the wear-resistant bracket. The glue is filled and sealed by a filling and sealing machine automatically.
i. And (e) after the pouring sealant 8 in the step h is solidified, pulling out the demolding rod 7, and finishing the processing of the electronic expansion valve coil. And after the glue is cured, directly grabbing the demoulding rod and directly pulling out the demoulding rod.
The design of the embodiment is ingenious, the process flow is simple, the operation is easy, and the production mode of 'fully encapsulating' of the traditional electronic expansion valve coil is changed by the production mode of 'matching the demoulding rod with the wear-resistant bracket'; each production process of the embodiment can be completed by automatic equipment, so that full-automatic assembly line production of the electronic expansion valve coil is realized, the continuity is very strong, the powerless state of labor shortage is greatly relieved, the production efficiency of products is greatly improved, and the investment cost of enterprises on human resources is also greatly reduced; the consistency of the product manufactured by the embodiment is good, and the product quality is stable and reliable;
the embodiment can achieve zero rejection rate; the traditional product is discarded mainly because the injection molding defect of the injection molding piece wrapping the stator coil assembly possibly exists in the injection molding process; the injection molding part of the embodiment is only the coil shell and has no lining part, the injection molding is finished after the mold is closed, the mold is opened after the injection molding, and the coil shell automatically falls off; because the coil shell has a simple shape, the injection molding raw materials flow smoothly, and the quality problems of material shortage, sand holes and the like are not easy to occur, if any, the injection molding raw materials are directly removed and used as return materials for reutilization; the embodiment can realize zero rejection rate of products, has high resource utilization rate and obviously and greatly reduces purchasing cost;
the embodiment realizes the full-automatic production of the electronic expansion valve coil, conforms to the requirement of the era of intelligent manufacturing in continuous innovation, has very important significance in the technical field of the electronic expansion valve, creates considerable economic benefit for enterprises in an efficient production mode, and saves precious resources for society by the efficient utilization rate of resources.
Example 2:
on the basis of the embodiment 1, the present invention continues to describe the technical features and functions of the technical features in the present invention in detail to help those skilled in the art fully understand the technical solution of the present invention and reproduce it.
A split type preparation process for an electronic expansion valve coil comprises the following operation steps:
a. preparing the coil housing 1 qualified for inspection in advance for standby; the coil shell 1 is formed by injection molding through an injection molding machine, and the coil shell 1 which is detected to be unqualified is directly used as a return material to be reused;
b. assembling the stator coil assembly 2; the stator coil assemblies 2 are sequentially assembled by utilizing automatic equipment; specifically, the stator coil assembly 2 of the present embodiment is formed by relatively splicing two identical stator coils;
the upper stator coil comprises an upper stator shell 221, an upper coil winding 222 which is fixed in the upper stator shell 221 and is provided with a guide pin 21, and an upper electromagnetic plate 223 which is fixedly connected with the upper coil winding 222, wherein pawls on the upper electromagnetic plate 223 are distributed in a staggered manner with those of the upper stator shell 221;
the lower stator coil comprises a lower stator shell 211, a lower coil winding 212 which is fixed in the lower stator shell 211 and is provided with a guide pin 21, and a lower electromagnetic pole plate 213 which is fixedly connected with the lower coil winding 212, wherein pawls on the lower electromagnetic pole plate 213 are distributed in a staggered way with those of the lower stator shell 211; upper pole plate 223 is also fixedly attached to lower pole plate 213. The stator shell and the coil winding are pre-fixed in an interference fit mode through the protrusions and the through holes, the electromagnetic plate coil winding is pre-fixed in an interference fit mode through the protrusions and the through holes, and the upper electromagnetic plate and the lower electromagnetic plate are pre-fixed in an interference fit mode through the protrusions and the through holes. The stator coil assembly of the present embodiment can be assembled in sequence through an automated assembly line. During winding, the end of the enameled wire of the stator coil assembly 2 is wound on the guide pin 21 and is electrically connected with the guide pin 21 by soldering, which is a mature process in the prior art and is not repeated for avoiding complicated literary work.
c. A wear-resistant bracket 3 is fixedly arranged on two end faces of the stator coil assembly 2; the wear-resistant bracket 3 is provided with a bracket through hole 34 for the electronic expansion valve body 4 to penetrate through; the wear-resistant bracket 3 is also fixed on the end face of the stator coil assembly 2 by using automatic equipment, and the outer diameter of the wear-resistant bracket 3 is preferably not larger than that of the stator coil assembly so as to prevent the subsequent glue filling speed from being influenced.
The bracket through hole 34 of the present embodiment is equal to the diameter of the inner ring of the stator coil assembly. The wear bracket 3 body comprises an annular body 31 and an annular boss 32 protruding from the annular body 31. The wear-resistant bracket 3 is a hard plastic part and is fixedly connected with the stator coil assembly 2 in an adhesive connection mode. The gluing mode is that silica gel is adopted; low cost and firm adhesion.
Or, the wear-resistant bracket 3 is a metal piece and is fixedly connected with the stator coil assembly 2 in a gluing or spot welding connection mode. If the gluing mode is adopted, silica gel is adopted; low cost and firm adhesion.
The wear-resistant support has double functions, on one hand, the product performance is improved, the annular main body 31 can be submerged by the potting adhesive, and after the potting adhesive is solidified, the accessories in the coil shell 1 are stably contained in the coil shell 1, so that the product performance is stable and reliable; on the other hand, the electronic expansion valve coil and the electronic expansion valve body are assembled, the electronic expansion valve body is rotated, the mounting plate on the electronic expansion valve body is assembled on the electronic expansion valve coil positioning element, the product is abraded to a certain degree through frequent rotation, the design protruding out of the annular main body 31 can effectively avoid the condition, glue for encapsulation does not exceed the upper plane of the annular main body, and the annular main body also plays a role in limiting the flow.
It is further preferable that the annular body 31 of the present embodiment is further provided with a wear-resistant boss 33 which maintains the same plane as the annular boss 32, and the assembling end 51 of the positioning element 5 in step d is disposed opposite to the wear-resistant boss 33. The electronic expansion valve frequently vibrates in work, the vibration between the assembling end 51 and the mounting plate 41 is transmitted to the wear-resistant support, certain abrasion is caused to the wear-resistant support, and if the assembling end 51 and the mounting plate 41 are abraded, the mounting is not firm, so that the normal use of a product is further influenced. This embodiment effectively solves this problem through the design of wear-resisting boss 33, further strengthens the durability and the life of product.
d. A positioning element 5 matched with the mounting plate 41 of the electronic expansion valve body 4 is fixedly mounted on the stator coil assembly 2; the fitting end 51 of the positioning element 5 is arranged opposite the body of the wear bracket 3; the positioning element 5 is fixedly connected with the side wall of the stator coil assembly 2 by using a welding robot; the positioning element 5 is fixedly connected with the side wall of the stator coil assembly 2 by a welding robot in a welding mode;
e. an external wiring harness 6 is welded on a guide pin 21 led out from the stator coil assembly 2; the guide pin 21 can be connected with an external wiring harness through soldering after transition of a circuit board, and the external wiring harness 6 can be directly and electrically welded with the guide pin 21 through an ultrasonic welding process.
f. The product of step e is assembled into the coil housing 1. A certain pretightening force is assembled between the product obtained in the step e and the coil shell 1 so as to prevent the product obtained in the step e and the coil shell 1 from relatively shifting when being transported on a conveying belt; the end face of the upper stator shell and the bottom face of the coil shell are pre-fixed in a mode of interference fit of the protrusions and the through holes.
g. The demoulding rod 7 is inserted, and the inner wall of the demoulding rod 7 is attached to the inner wall of the stator coil assembly 2 and the inner wall of the coil shell top cap 11; the demoulding rod plays a role in moulding, a storage container with an opening at the upper end is formed in the coil shell except for the space occupied by the demoulding rod due to the existence of the demoulding rod, and the storage container is used for subsequent glue filling so as to ensure that a coil winding of the stator coil assembly can be completely sealed, thereby ensuring the product performance and the service life of the electronic expansion valve coil;
the demoulding rod 7 in the step g of the embodiment is a reducing rod; it includes the upper rod 71 whose diameter is equal to the diameter of the inner ring of the stator coil assembly 2 and the inner ring of the coil housing top cap 11, and the lower rod 72 whose diameter is larger than the diameter of the bracket through hole 34. The diameters of the inner ring of the stator coil assembly 2, the inner ring of the coil shell top cap 11, the upper rod 71 and the bracket through hole 34 are equal.
h. Pouring the pouring sealant 8 into the coil shell 1 in the step g, wherein the poured pouring sealant 8 does not exceed the top surface of the wear-resistant support 3, and the pouring sealant 8 is not bonded with the demolding rod 7; the pouring sealant 8 has good fluidity, but the existence of the demoulding rod enables the glue to only flow into the flowing space, and the pouring sealant 8 is not bonded with the demoulding rod 7, so that the demoulding rod 7 is ensured to be smoothly separated. The top surface of the wear-resistant bracket is the upper end plane of the annular boss 32. The filling and sealing of the glue are automatically completed by a filling and sealing machine;
in this embodiment, the non-adhesion between the pouring sealant 8 and the demolding rod 7 can be realized by spraying the nonstick coating on the demolding rod 7 in step g.
i. And (e) after the pouring sealant 8 in the step h is solidified, pulling out the demolding rod 7, and finishing the processing of the electronic expansion valve coil. And after the glue is cured, directly grabbing the demoulding rod and directly pulling out the demoulding rod.
The design of the embodiment is ingenious, the process flow is simple, the operation is easy, and the production mode of 'fully encapsulating' of the traditional electronic expansion valve coil is changed by the production mode of 'matching the demoulding rod with the wear-resistant bracket'; each production process of the embodiment can be completed by automatic equipment, so that full-automatic assembly line production of the electronic expansion valve coil is realized, the continuity is very strong, the powerless state of labor shortage is greatly relieved, the production efficiency of products is greatly improved, and the investment cost of enterprises on human resources is also greatly reduced; the consistency of the product manufactured by the embodiment is good, and the product quality is stable and reliable;
the embodiment can achieve zero rejection rate; the traditional product is discarded mainly because the injection molding defects of the injection molding part of the wrapped stator coil assembly can exist in the injection molding process; the injection molding piece of the embodiment is only the coil shell, no lining piece is arranged, the injection molding is completed after the mold is closed, the mold is opened after the injection molding, and the coil shell automatically falls off; because the coil shell has a simple shape, the injection molding raw materials flow smoothly, and the quality problems of material shortage, sand holes and the like are not easy to occur, if any, the injection molding raw materials are directly removed and used as return materials for reutilization; the embodiment can realize zero rejection rate of products, has high resource utilization rate and obviously and greatly reduces purchasing cost;
the embodiment realizes the full-automatic production of the electronic expansion valve coil, conforms to the requirement of the era of intelligent manufacturing in continuous innovation, has very important significance in the technical field of electronic expansion valves, creates considerable economic benefit for enterprises in an efficient production mode, and saves precious resources for society by the efficient utilization rate of resources.
Example 3:
in this embodiment, based on embodiment 1 or embodiment 2, the pouring sealant 8 in step h of this embodiment is polyurethane glue; and step g, the demoulding rod 7 is made of hard metal materials, and a Teflon non-stick coating is sprayed on the surface layer of the demoulding rod 7. The polyurethane glue is a common encapsulating glue, so the purchase cost is low; the manufacturing mode of the demoulding rod is easy to realize, and the practicability is strong.
Example 4:
in this embodiment, based on any of the above embodiments, the connection end of the external harness 6 is directly electrically connected to the lead pin 21 of the stator coil assembly 2 by using an ultrasonic welding process.
The traditional external wiring harness 6 and the guide pin 21 are electrically connected in a soldering mode, and cannot be soldered directly, and quality problems are easy to occur due to the fact that direct soldering connection is not firm. Therefore, the traditional electronic expansion valve coil is transited through a circuit board. The lead pins are soldered with the circuit board, and the connecting ends of the external wiring harness 6 are welded with the circuit board more firmly. But the cost would be relatively high in this conventional manner. In the embodiment, the connecting end of the external wiring harness 6 is directly and electrically connected with the guide pin 21 of the stator coil assembly 2 through an ultrasonic welding process.
Example 5:
the present embodiment is an electronic expansion valve coil, which is manufactured by the above-explained split manufacturing process of the electronic expansion valve coil.
Therefore, the invention is not to be limited to the specific embodiments, but rather, all equivalent changes and modifications in the shapes, structures, characteristics and spirit of the invention are intended to be included within the scope of the appended claims.

Claims (10)

1. A split type preparation process for an electronic expansion valve coil is characterized by comprising the following operation steps:
a. preparing a coil shell qualified for inspection in advance for standby;
b. assembling a stator coil assembly;
c. selecting and fixedly mounting a wear-resistant bracket on two end faces of the stator coil assembly; the wear-resistant bracket is provided with a bracket through hole for the valve body of the electronic expansion valve to penetrate through;
d. a positioning element matched with a mounting plate of the valve body of the electronic expansion valve is fixedly mounted on the stator coil assembly; the assembling end of the positioning element is opposite to the main body of the wear-resistant bracket;
e. welding an external wire harness on a lead pin led out of the stator coil assembly;
f. fitting the product of step e into the coil housing;
g. the demoulding rod is inserted, and the inner wall of the demoulding rod is attached to the inner wall of the stator coil assembly and the inner wall of the coil shell top cap;
h. pouring a pouring sealant into the coil shell in the step g, wherein the poured pouring sealant does not exceed the top surface of the wear-resistant support, and the pouring sealant is not adhered to the demolding rod;
i. and d, after the pouring sealant in the step h is solidified, pulling out the demoulding rod, and finishing the processing of the electronic expansion valve coil.
2. The split-type preparation process of the coil of the electronic expansion valve according to claim 1, characterized in that: the stator coil assembly is formed by oppositely splicing two identical stator coils;
the upper stator coil comprises an upper stator shell, an upper coil winding which is fixed in the upper stator shell and provided with a guide pin, and an upper electromagnetic plate which is fixedly connected with the upper coil winding, wherein pawls on the upper electromagnetic plate and pawls on the upper stator shell are distributed in a staggered manner;
the lower stator coil comprises a lower stator shell, a lower coil winding which is fixed in the lower stator shell and provided with a guide pin, and a lower electromagnetic pole plate which is fixedly connected with the lower coil winding, wherein pawls on the lower electromagnetic pole plate and pawls on the lower stator shell are distributed in a staggered manner; the upper electromagnetic plate is also fixedly connected with the lower electromagnetic plate.
3. The split type preparation process of the coil of the electronic expansion valve according to claim 1, characterized in that: the wear-resistant support main body comprises an annular main body and an annular boss protruding from the annular main body.
4. The split-type preparation process of the coil of the electronic expansion valve according to claim 3, characterized in that: and d, arranging a wear-resistant boss which keeps the same plane with the annular boss on the annular main body, and arranging the assembling end of the positioning element in the step d opposite to the wear-resistant boss.
5. The split-type preparation process of the coil of the electronic expansion valve according to claim 3, characterized in that: the wear-resistant bracket is a hard plastic part and is fixedly connected with the stator coil assembly in an adhesive connection mode;
or the wear-resistant bracket is a metal piece and is fixedly connected with the stator coil assembly in a gluing or spot welding connection mode.
6. The split-type preparation process of the coil of the electronic expansion valve according to claim 1, characterized in that: the connecting end of the external wiring harness is directly and electrically connected with a guide pin of the stator coil assembly by an ultrasonic welding process.
7. The split-type preparation process of the coil of the electronic expansion valve according to claim 1, characterized in that: the demoulding rod in the step g is a variable diameter rod; the upper rod and the lower rod are arranged in the upper end of the coil shell, and the diameter of the upper rod is equal to that of the inner ring of the stator coil assembly and that of the inner ring of the top cap of the coil shell.
8. The split-type preparation process of the coil of the electronic expansion valve according to claim 1, characterized in that: and g, spraying non-stick paint on the demolding rod in the step g to realize non-adhesion of the pouring sealant and the demolding rod.
9. The split-type preparation process of the coil of the electronic expansion valve according to claim 8, characterized in that: the pouring sealant in the step h is polyurethane glue; and g, the demoulding rod is made of hard metal materials, and a Teflon non-stick coating is sprayed on the surface layer of the demoulding rod.
10. An electronic expansion valve coil prepared by applying the split preparation process of the electronic expansion valve coil as claimed in any one of claims 1 to 9.
CN202210552652.0A 2022-05-19 2022-05-19 Split type preparation process of electronic expansion valve coil and electronic expansion valve coil using split type preparation process Pending CN114833992A (en)

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CN112737251A (en) * 2020-12-23 2021-04-30 洛阳速普机电科技有限公司 Motor stator coil integral epoxy resin plastic package process
CN214063946U (en) * 2020-12-30 2021-08-27 扬州嘉华电气股份有限公司 Clamping structure and electronic expansion valve applying same
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