CN115727135A

CN115727135A - Electric control valve coil

Info

Publication number: CN115727135A
Application number: CN202110983586.8A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2023-03-03

Abstract

The invention discloses an electric control valve coil, which comprises a coil body, a contact pin and a lead, wherein joint structures formed by the contact pin and the lead are all encapsulated inside an insulating injection molding layer, the insulating injection molding layer is molded by a secondary injection molding process, the insulating injection molding layer comprises a coil encapsulating part and a joint encapsulating part, at least part of the contact pin is positioned outside the coil encapsulating part, and the outer end part of the contact pin positioned outside the coil encapsulating part and the joint structures formed by the lead are encapsulated in the joint encapsulating part; the connection joint structure of the contact pin and the lead wire is more reliable in injection molding encapsulation sealing, the electrical insulation performance of the encapsulated part can reach the insulation level equal to that of an injection molding layer outside the coil body, and after long-time use or a harsh test, the encapsulated part cannot fail first. Meanwhile, the injection molding packaging joint structure is adopted, solidification is not needed, and the production period of the product is shortened.

Description

Electric control valve coil

Technical Field

The invention relates to the technical field of control valves, in particular to an electric control valve coil.

Background

The current refrigeration systems of air conditioners and the like mainly comprise a compressor, an evaporator, a condenser and various regulating valve bodies, wherein an electronic expansion valve is a key part for regulating the flow of the system.

Electronic expansion valve includes coil part and valve body, and wherein the coil part further includes winding, skeleton, contact pin and lead wire again, and the winding twines on the core barrel of skeleton, and the outer injection molding is formed with the encapsulated layer, and when moulding plastics, the contact pin is fixed with the skeleton simultaneously to the contact pin part stretches out the encapsulated layer, and the contact pin that stretches out the encapsulated layer passes through circuit board and pin connection. Currently, the coil part further comprises Zhao Ke, the housing forms a circuit board packaging cavity, epoxy resin or polyurethane or other sealing and pouring glue is injected into the packaging cavity for curing, so that the lead is packaged, and a sealing and waterproof effect is achieved.

When the packaging cavity of the electronic expansion valve is sealed and filled, a certain time is needed for curing the epoxy resin, the polyurethane or other glue, so that the production cycle of the product is longer.

Disclosure of Invention

The invention aims to provide an electric control valve coil with more effective insulation sealing of the connecting joint structure positions of a pin and a lead.

The invention provides an electric control valve coil, which comprises a framework, a coil body, a magnetic conduction plate, a contact pin and a lead wire, wherein the coil body is wound on the framework, one end of the contact pin is connected with the coil body, the other end of the contact pin is connected with the lead wire to form a joint structure, the joint structures formed by the coil body, the contact pin and the lead wire are all encapsulated inside an insulating injection molding layer, the insulating injection molding layer is formed through a secondary injection molding process, the lead wire is partially exposed outside the insulating injection molding layer, the insulating injection molding layer comprises a coil encapsulating part and a joint encapsulating part, at least part of the contact pin is positioned outside the coil encapsulating part, and the outer end part of the contact pin positioned outside the coil encapsulating part and the joint structure formed by the lead wire are encapsulated in the joint encapsulating part.

The invention cancels the curing process of epoxy resin or polyurethane or other glue in the background technology through the injection molding packaging joint structure, thereby reducing the production cycle of the product.

Drawings

FIG. 1 is a schematic cross-sectional view of an electrically controlled valve in one embodiment of the present invention;

FIG. 2 is a schematic diagram of an electrical valve coil of an electrical valve according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of an electrical control valve coil according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a joint encapsulant layer in accordance with an embodiment of the present invention;

FIG. 5 is an enlarged, fragmentary view of a joint structure according to an embodiment of the present invention;

FIG. 6 is an enlarged, fragmentary view of a first engagement section in accordance with an embodiment of the present invention;

FIG. 7 is a schematic diagram of an electric control valve coil according to a second embodiment of the present invention;

FIG. 8 is a cross-sectional schematic view of FIG. 7;

fig. 9 is a schematic structural diagram of an electric control valve coil in a third embodiment of the invention.

Wherein, in fig. 1 to 9:

1-an electrically controlled valve coil; 11-coil injection molding; 111-a coil body; 112-a framework; 113-magnetic conductive plate; 114-a coil enclosure; 114 a-a partial encapsulation structure; 114 b-an integral insulating injection molded layer; 1141-waterproof rib; 1142-a convex part; 115-pin insertion; 12-a lead assembly; 121-a circuit board; 122 — a lead; 123-insulating sheath; 13, buckling; 14-a joint enclosure; 15-waterproof cap; 2-valve body; 21-a housing; 22-a shaft member; 23 — a rotor component; 24-nut member.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 9, fig. 1 is a schematic cross-sectional view of an electric control valve according to an embodiment of the present invention; FIG. 2 is a schematic diagram of an electrical valve coil of an electrical valve according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of an electrical control valve coil according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of a joint encapsulant layer in accordance with an embodiment of the present invention; FIG. 5 is an enlarged, fragmentary view of a joint structure according to an embodiment of the present invention; FIG. 6 is an enlarged, fragmentary view of a first engagement section in accordance with an embodiment of the present invention; FIG. 7 is a schematic diagram of an electric control valve coil according to a second embodiment of the present invention; FIG. 8 is a schematic cross-sectional view of FIG. 7; fig. 9 is a schematic structural diagram of an electric control valve coil in a third embodiment of the invention.

The invention provides an electric control valve, which mainly takes the electric control valve as an electronic expansion valve for example to describe the technical scheme and the technical effect, and of course, a person skilled in the art should understand that the electric control valve in the present invention can also be other types of valves.

The electronic expansion valve is mainly applied to a refrigerating and heating refrigerant circulating system, mainly plays a role in adjusting the refrigerant flow in the system, and utilizes the principle of a stepping motor to drive a motor rotor and drive a screw rod shaft and a valve needle to control the opening degree of a valve port.

The electric control valve comprises a valve body 2 and an electric control valve coil 1, wherein the electric control valve coil 1 is arranged on the valve body 2. Wherein the valve body 2 comprises a housing 21, a shaft member 22, a rotor member 23, a nut member 24 and a valve seat member 25. The electric control valve coil 1 at least comprises a framework 113, a coil body 111, a magnetic conduction plate 113, a pin 115 and a lead assembly 12. Of course, the electrically controlled valve coil 1 may further include a waterproof cap 15 and a buckle 13. The coil body 111 is generally an enameled wire structure, and the following description is made only for the main components related to the invention, and the other components are referred to the background art.

The lead assembly 12 includes at least one lead 122. The coil body 111 is sleeved on the frame 112, and one end of the pin 115 is connected to the coil body 111 and the other end is connected to the lead 122 to form a joint structure. The pins 115 and the leads 122 may be directly connected or indirectly connected through an intermediate member. The intermediate member may be a wiring board 121 or the like. The contact pin 115 is connected with the lead 122 through the circuit board 121, the outer end part of the contact pin 115 is welded and fixed with the circuit board 121, the inner end part of the lead 122 is welded and fixed with the circuit board 121, and the circuit board 121, the outer end part of the contact pin 115 fixed with the circuit board 121 and the inner end part of the lead 122 form a joint structure.

According to the invention, the electric control valve coil 1 can be fixed to the valve body 2 through a buckle, the outer end part of the lead wire 122 can be electrically connected with the driving controller, after the driving controller is electrified, a pulse driving signal is sent to the electric control valve coil 1, the coil body 111 is electrified to generate a magnetic field, the magnetic conducting plate 113 is provided with magnetic poles, and the magnetic poles gather and amplify the magnetic field generated by the coil body 111 to attract corresponding magnetic poles on the rotor component 23. Because the pulse signal generated by the driving controller changes periodically, the electric control valve coil 1 also generates a periodically changing magnetic field, so as to drive the rotor component 23 in the electronic expansion valve body to rotate positively or reversely, the rotor component 23 is fixedly connected with the shaft component 22, and the rotor component drives the shaft component 22 to rotate. The shaft component 22 and the nut component 24 are in threaded fit, and the shaft component 22 can perform displacement motion along the axial direction while the rotor component 23 rotates, so that the valve needle 21 can be driven to open and close a valve port, and the flow rate of a refrigerant in an air-conditioning refrigerating and heating system can be adjusted.

The coil body 111, the contact pin 115 and the lead wire form joint structures which are all encapsulated inside the insulating injection molding layer, the insulating injection molding layer is molded through an injection molding process, and at least part of the lead wire is exposed outside the insulating injection molding layer, so that the lead wire is conveniently connected with an external driving controller.

The insulating layer of moulding plastics mainly plays the waterproof sealed effect of electric control valve coil 1 insulation, under the normal function's of not influencing electric control valve coil 1 condition, the structure on insulating layer of moulding plastics can have multiple form. Also, the insulating injection molded layer may be formed as a one-piece insulating injection molded layer b by one-time injection molding, as shown in fig. 9. The insulating injection-molded layer can of course also be formed by two or more injection-molding, as shown in fig. 1 to 8. I.e. the insulating injection-moulded layer is formed by two or more injection-moulding steps. A specific embodiment of the molding of the insulating injection molded layer will be described in detail later.

Compared with the joint structure of the contact pin 115 and the lead 122 in the prior art, the insulation injection molding layer formed by the connection joint structure of the contact pin 115 and the lead 122 through the injection molding process is more reliable in sealing by adopting the injection molding packaging joint structure, the electrical insulation performance of the packaging part can reach the insulation level equal to that of the injection molding layer outside the coil body 111, and the packaging part cannot fail first after long-time use or a harsh test. Meanwhile, the injection molding packaging joint structure cancels the curing process of the background technology and reduces the production period of the product.

In one embodiment, the lead assembly 12 may further include an insulating sheath 123, at least a portion of the wire section of the lead 122 is provided with the insulating sheath 123, the insulating sheath 123 is partially located inside the insulating injection molded layer and partially located outside the insulating injection molded layer, and the insulating sheath 123 is circumferentially sealed with the insulating injection molded layer. Both circumferential seals can be achieved by forming the insulating injection molded layer around the outer circumference of the insulating sheath 123 in an injection molding process.

Insulating sheath 123 can play the guard action to exposing to the outside lead wire in insulating layer of moulding plastics, reduces the risk that the lead wire was by the fish tail to insulating sheath 123 part is located insulating layer inside of moulding plastics, and its circumference can play better sealed with insulating layer of moulding plastics, further improves the reliability of lead wire work.

The insulating sheath 123 mainly functions to protect the lead and insulate, and the material and structure thereof are not limited herein as long as the safety of use of the electric device is satisfied.

The insulating sheath 123 may be integrated with the lead, or the insulating sheath 123 may be separated from the lead, and the lead and the insulating sheath 123 are processed separately, and then the lead is sleeved in the insulating sheath 123.

The insulating sheath 123 is formed integrally with the lead 122, so that the insulating sheath 123 protects the lead 122 more reliably.

When the insulating injection molding layer of the packaging joint structure is used for injection molding, the resin is fused with the surface of the insulating sheath 123, so that the sealing and waterproof effects are achieved.

It is found through many experiments herein that the length L1 of the insulating sheath 123 located inside the insulating injection layer is preferably equal to or greater than 5mm, and at this time, the sealing property and the insulating property of the insulating sheath 123 and the external insulating injection layer thereof are both better.

In one particular embodiment, the insulating injection molded layer includes the coil and

joint enclosures

114 and 14, the coil and

joint enclosures

114 and 14 being molded in different injection molding processes.

Specifically, the insulating injection molded layer is molded by the following method:

firstly, placing an assembly formed by all parts at least comprising a framework 112, a coil body 111, a magnetic conduction plate 113 and a contact pin 115 into a forming mold, and forming a coil encapsulating part 114 outside the assembly through a first injection molding process to form a coil injection molding part 11, wherein the contact pin 115 is partially wrapped in the coil encapsulating part 114 and partially positioned outside the coil encapsulating part 114;

the coil injection molding member 11 mainly aims to form an insulating injection molding layer outside the coil body 111, and the above operation may be substantially the same as the prior art, and the components to be placed in the molding die may depend on the basic composition structure of the electric control valve coil 1, and may include the above components, but are not limited thereto.

And secondly, after the coil injection molding part is molded, connecting the outer end part of the contact pin 115 of the coil injection molding part 11 encapsulated and molded in the first injection molding process with a lead to form a joint structure, namely, the step mainly has the effect of realizing the connection of the lead and the contact pin 115.

And thirdly, placing the coil injection molding part with the joint structure into an adaptive molding die, and molding the joint enclosure part 14 of the enclosure joint structure through a second injection molding process, wherein the joint enclosure part 14 and the coil enclosure part 114 are in sealed connection at adjacent positions.

The connected pins 115 and leads are placed in the corresponding mold in the coil injection molded part 11 formed in the first injection molding process, and the joint sealing part 14 sealed outside the joint structure is molded in the second injection molding process, and the joint sealing part 14 can form a seal with the previously injection molded coil sealing part 114 during injection molding.

In addition, for the electric control valve in which the coil 1 of the electric control valve is fixed to the valve body by the snap, the snap can be directly positioned in the joint enclosure 14 in the injection molding process of the joint enclosure 14. The specific structure of the buckle is not limited herein, and reference can be made to the background art.

In the embodiment, the formation of the integral encapsulation structure, namely the insulating encapsulation layer, of the electric control valve coil 1 is realized through two times of injection molding, the realization process is simple, and the requirement on an injection molding mold is correspondingly low.

In order to improve the sealing between the coil enclosure 114 and the joint enclosure 14, a specific embodiment is also provided.

In a specific embodiment, the coil enclosure 114 includes a first engagement section engaged with the joint enclosure 14, an outer surface of the first engagement section being provided with a concave-convex structure including at least one concave portion and at least one convex portion 1142; in the second injection molding process, the resin is wrapped around the outside of the first joint section to form the second joint section of the joint enclosure 14.

In the second injection molding process, the resin fills the concave portion of the first joint section and wraps the convex portion 1142 of the first joint section, so that the joint surface of the joint enclosure 14 and the coil enclosure 114 is formed in a curved structure, which not only improves the joint capacity of the two, but also is beneficial to improving the sealing performance between the two.

Referring to fig. 4, 5 and 6, further, the concave portion of the first joining section includes an annular groove, an annular waterproof rib 1141 is further formed on the inner wall of the annular groove, and a longitudinal section width of at least a top dimension of the waterproof rib 1141 is smaller than a predetermined thickness so as to be capable of being joined with the joint sealing part 14 by heat fusion in the second injection molding process to form a whole.

The structure of the waterproof rib 1141 may have various forms, for example, the waterproof rib 1141 may have a tip structure at the top, for example, a triangular structure in longitudinal section, or a sheet structure, for example, a rectangular structure in longitudinal section. As long as the top portion of the waterproof rib 1141 can be heat-melted in the second injection molding process.

The size at the at least top of waterproof muscle 1141 is in the hot melt within range, and when moulding plastics the second time like this, high temperature resin makes the partial hot melt of waterproof muscle 1141, and waterproof muscle 1141 can form a whole with the second time resin of moulding plastics after the hot melt, has improved the joint ability between first joint section and the second joint section, improves the leakproofness, and waterproof muscle 1141 has further improved the two leakproofness for the annular in addition, and then improves insulating properties.

Because the top size of waterproof muscle 1141 is less, corresponding intensity is also lower, so in order to make waterproof muscle 1141 not damaged before the second time of moulding plastics as far as possible, this paper has still provided following technical scheme.

Further, the height L2 of the annular waterproof rib 1141 is lower than the height L3 of the two side walls of the annular groove in which the annular waterproof rib is located. The top of the annular waterproof rib 1141 is not higher than the two side walls of the annular groove, and the annular groove can play a role in protecting the annular waterproof rib 1141 to a certain extent.

The shape of the insulating injection-molded layer may take various forms, such as fig. 1 to 6 in which the coil injection-molded portion is completely encapsulated, and fig. 7 to 8 in which the insulating injection-molded layer is partially encapsulated 114a, the outer circumference of the coil in fig. 7 and 8 is not completely injected, and the outer circumference of the coil in the structure in fig. 1 to 6 in which the outer circumference of the coil is completely injected, which can reduce the amount of the encapsulating resin used.

For other structures of the electric control valve, please refer to the background art, and detailed description thereof is omitted.

The electrical control valve provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An electric control valve coil is characterized by comprising a framework (112), a coil body (111), a magnetic conduction plate (113), a contact pin (115) and a lead (122), wherein the coil body (111) is wound on the framework (112), one end of the contact pin (115) is connected with the coil body (111), the other end of the contact pin is connected with the lead (122) to form a joint structure, the joint structure formed by the coil body (111), the contact pin (115) and the lead (122) is encapsulated inside an insulating injection molding layer, the insulating injection molding layer is molded through a secondary injection molding process, part of the lead (122) is exposed outside the insulating injection molding layer, the insulating injection molding layer comprises a coil encapsulating part (114) and a joint encapsulating part (14), wherein the contact pin (115) is at least partially positioned outside the coil encapsulating part (114), and the contact pin (115) is encapsulated in the joint encapsulating part (14) formed by the outer end part of the coil encapsulating part (114) and the lead joint structure (122).

2. An electrically controlled valve coil according to claim 1, characterized in that at least part of the wire sections of the lead (122) are provided with an insulating sheath (123), the insulating sheath (123) is partly inside the insulating injection molded layer and partly outside the insulating injection molded layer, and the insulating sheath (123) is circumferentially sealed with the insulating injection molded layer.

3. An electrically controlled valve coil according to claim 2, wherein the insulating sheath (123) and the lead wire (122) are of an integral structure or a split structure, and the length of the insulating sheath (123) in the insulating injection molding layer is greater than or equal to 5mm.

4. An electrically controlled valve coil according to any of claims 1 to 3, wherein said insulating injection molded layer is formed by:

placing an assembly formed by all parts including at least the framework (112), the coil body (111), the magnetic conductive plate (113) and the pins (115) into a forming mold, and forming a coil encapsulating part (114) outside the assembly through a first injection molding process to form a coil injection molding part (11), wherein the pins (115) are partially wrapped in the coil encapsulating part (114);

connecting the outer end parts of the pins (115) of the coil injection molding part (11) encapsulated and formed in the first injection molding process with the leads (122) to form a joint structure, then placing the coil injection molding part (11) with the joint structure into an adaptive molding mold, and forming the joint encapsulating part (14) encapsulating the joint structure through the second injection molding process, wherein the joint encapsulating part (14) and the coil encapsulating part (114) are in sealing connection at adjacent positions.

5. An electrically controlled valve coil according to claim 4, wherein the coil enveloping part (114) comprises a first engaging section engaging with the joint enveloping part (14), an outer surface of the first engaging section being provided with a relief structure comprising at least one recess and at least one projection (1142); in a second injection molding process, resin is wrapped around the exterior of the first joint section to form a second joint section of the joint enclosure (14).

6. An electrically controlled valve coil according to claim 5, wherein the recess comprises an annular groove, the inner wall of the groove of the annular groove is further formed with an annular waterproof rib (1141), and the waterproof rib (1141) has a longitudinal cross-sectional width of at least a top dimension smaller than a predetermined thickness so as to be capable of being heat-fused with the joint wrap (14) to form a whole in the second injection molding process.

7. An electrically controlled valve coil according to claim 6, wherein the annular waterproof rib (1141) is lower than the two side walls of the annular groove.

8. An electric control valve coil according to claim 4, characterized by further comprising a snap (13) for connecting and fixing the electric control valve coil (1) and the valve body (2) of the electric control valve, wherein the snap (13) is positioned at the joint enclosure (14) in a second injection molding process.

9. An electrically controlled valve coil according to any one of claims 1 to 3, further comprising a circuit board, wherein the pins (115) are connected to the leads (122) through the circuit board, the outer ends of the pins (115) are soldered to the circuit board, the inner ends of the leads (122) are soldered to the circuit board, and the outer ends of the pins (115) and the inner ends of the leads (122) fixed to the circuit board form the joint structure.

10. An electrically controlled valve coil according to any one of claims 1 to 3, wherein said insulating injection molded layer is of unitary construction, said insulating injection molded layer being formed in the same injection molding process.