JP2003163040A - Magnet coil equipment for control valve and its sealing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet coil equipment for a control valve which increase conduction reliability of a connector without widely raising parts cost and man-hour, and which can prevent conduction malfunction under low temperature usage. <P>SOLUTION: In the magnet coil equipment for the control valve which makes conduction connection of a pin head 21 of a square pin 7 used as a terminal on a coil side and a lead wire 29 for coil energization by a male-female fitting connector 20, the male-female fitting connector 20 is entirely potted after adhering a male-female fitting area of the male-female fitting connector 20 with conductive adhesive 25. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve electromagnetic coil device and a method for sealing a control valve electromagnetic coil device, and more particularly to a control valve electromagnetic coil device including a connector fitting type lead wire drawing portion. The present invention relates to a method of sealing an electromagnetic coil device for a control valve.

[0002]

2. Description of the Related Art An electromagnetic coil device forming a stator coil or a solenoid coil is attached to an electric control valve which is opened and closed by an electric motor such as a stepping motor or an electromagnetic control valve which is opened and closed by an electromagnetic solenoid device. Japanese Unexamined Patent Publication No. 2000-
As disclosed in Japanese Patent No. 76927, the coil-side terminal and the coil-conducting lead wire are electrically connected by a male-female connector, and the entire connector is a thermosetting resin for waterproof insulation or the like. It is known that it is sealed with an electrically insulating resin such as or a thermoplastic resin.

[0003]

Electric control valves and electromagnetic control valves used in refrigeration / refrigerators and air conditioners using a refrigeration cycle are used under severe low temperature conditions, and resin sealing of male and female fitting type connectors is used. Since the part is also exposed to a severe low temperature atmosphere, the sealing resin contracts due to the temperature decrease, and in particular, the sealing resin on the back surface of the contact of the connector contracts,
There is a possibility that normal contact pressure cannot be obtained at the male and female fitting portions, resulting in poor conduction.

[0004] Such a thing becomes remarkable when the contact receiving gap of the contact is weakened due to widening of the contact receiving portion gap due to oblique insertion or addition of a lateral load when the male and female connectors are fitted together.

Therefore, it is necessary to carefully engage the male and female mating of the connector, and as a measure for improving the conduction reliability of the connector part, the contact load of the contact of the connector part is increased or the spring contact structure is changed to the caulking structure. Countermeasures such as changes and soldering of male and female fitting parts are possible. However, these measures
All of them have a problem that the cost of parts and the number of man-hours increase greatly.

The present invention has been made in order to solve the above-mentioned problems, and enhances the conduction reliability of the connector portion without causing a large increase in parts cost and man-hours, and causes conduction failure even under low temperature use. An object of the present invention is to provide a control valve electromagnetic coil device and a method of sealing a control valve electromagnetic coil device, which are not feared.

[0007]

In order to achieve the above object, in the electromagnetic coil device for a control valve according to the present invention, the coil side terminal and the coil energizing lead wire are electrically connected by a male and female fitting type connector. In the electromagnetic coil device for a control valve to be connected, the male and female fitting portions of the connector are adhered with a conductive adhesive, and the entire part including the connector is sealed with an electrically insulating resin.

According to the electromagnetic coil device for a control valve of the present invention, the male and female fitting portions of the connector are bonded by the conductive adhesive, and the entire part including the connector is sealed by the electrically insulating resin. Even if the sealing resin (electrically insulating resin) contracts due to the temperature decrease, the normal contact pressure in the male and female fitting portions is secured by the adhesive force of the conductive adhesive, and the conduction failure does not occur. Further, even if normal contact pressure cannot be obtained, the conductivity of the male and female fitting portions is ensured by the conductivity of the conductive adhesive present in the male and female fitting portions, and no conduction failure occurs. .

A connector used in an electromagnetic coil device for a control valve according to the present invention has a curl spring piece and a female contact to which a lead wire is conductively connected. The male terminal may be of a type in which the male terminal is inserted and fitted, and the male terminal and the female contact can be bonded by a conductive adhesive.

In the control valve electromagnetic coil device according to the present invention, the portion excluding the connector portion is sealed by injection molding resin, and the connector portion is sealed by potting with thermosetting resin. Alternatively, the whole part including the connector may be sealed by potting with a thermosetting resin.

In order to achieve the above-mentioned object, in the method for sealing the electromagnetic coil device for a control valve according to the present invention, the coil side terminal and the coil energizing lead wire are electrically connected by a male and female fitting type connector. In the method for sealing a control valve electromagnetic coil device to be connected, a conductive adhesive is applied to the male and female fitting portions of the connector, and the male and female fitting portions are bonded with a conductive adhesive, after which, The whole including the connector is sealed with an electrically insulating resin.

Further, in the method for sealing the electromagnetic coil device for a control valve according to the present invention, the conductive adhesive is obtained by mixing a metal filler into a main component made of a thermosetting resin such as epoxy resin or polyurethane. The electrically insulating resin for encapsulation is a thermosetting resin, and the conductive adhesive is cured by a preheating step of the encapsulation portion performed as a pre-step of the encapsulating step with the electrically insulative resin. .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows one embodiment in which the electromagnetic coil device for a control valve according to the present invention is applied to a stator coil device for an electric control valve driven by a stepping motor.

The control valve electromagnetic coil device 30 has two upper and lower cylindrical stator coils (windings) 1, bobbins 3 and 4 of the stator coils 1 and 2, and a plurality of magnetic pole teeth. Upper and lower outer arms 5 and 6, and angular pins (plurality) 7 for conducting the coil, which are electrically connected to the stator coils 1 and 2.
A ring-shaped bottom plate 8 (FIGS. 3 and 4) formed with a positioning piece 8A for positioning the valve body (not shown).
, And all of them except the tip of each square pin 7 are resin-sealed by injection molding with a thermoplastic resin (injection molding resin) having electrical insulation such as polystyrene resin (PS resin) and ABS resin. It has been stopped. This sealing molding is designated by the reference numeral 9.

A cover 10 made of hard rubber or synthetic resin is put on the outside of the sealing molding portion 9. The inside of the stator coils 1 and 2 (the inside of the outer ridges 5 and 6) is a space 11 having a circular cross-sectional shape whose upper end is closed by a cover 10 as seen in FIG. 1, and this space 11 will be described later. The rotor case 52 of the stepping motor 50 is housed.

The square pin 7 has its root portion hardened by the cured sealing resin of the sealing molding portion 9, and the pin tip portion 21 aligned and exposed to the outside from the sealing molding portion 9 is at the lead wire drawing portion. It forms the male terminal of the male-female fitting type connector 20.

As shown in FIG. 2, the male / female fitting type connector 20 includes a contact (female type contact) 23 formed by phosphor bronze / tin plating or the like, in which a lead wire 29 is caulked and connected to a crimping connection portion 22, It has a box-shaped plastic housing 24 in which the contacts 23 are aligned.

The contact 23 includes a curl-shaped pressing spring portion (curl spring piece) 23A and a cylindrical portion 2 which includes the pressing spring portion 23A and serves as a female terminal of the male-female fitting type connector 20.
3B, which receives the pin tip portion 21 in the tubular portion 23B and is inserted into the tubular portion 23B.
By means of the spring force of the pressing spring portion 23A,
By pressing the surface of the contact pin 23 against the pressing spring portion 23A, the square pin 7 and the lead wire 29 are electrically connected by the metal contact between the contact 23 and the pin tip portion 21.

The connector portion of the above-mentioned male / female fitting type connector 20 is formed by potting with a thermosetting resin having electric insulation such as epoxy resin or polyurethane.
The sealing molding portion 9 is hermetically sealed. This portion is called a potting portion 12. The thermosetting resin used for this potting may be not only a thermosetting type, but also a two-part epoxy resin or polyurethane that accelerates the curing reaction, or a chemical reaction type that can be cured at room temperature. .

The male and female fitting portions of the male and female fitting type connector 20,
That is, the pin tip portion 21 and the contact 23 are adhered by the conductive adhesive 25. Conductive adhesive 25
The main component is a thermosetting resin such as an epoxy resin-based or polyurethane-based resin mixed with a metallic filler such as silver or copper, which is heat-cured at about 80 ° C to 200 ° C.

The conductive adhesive 25 is used before the potting and the pin tip portion 21 is connected to the cylindrical portion 23 of the contact 23.
Before being inserted into B, an appropriate amount of conductive adhesive 25 is applied to the outer surface of the pin tip portion 21 or the inner surface of the cylindrical portion 23B, or both, and after the adhesive agent is applied, the pin tip portion 21 is connected to the cylindrical shape of the contact 23. Insert into the portion 23B and connect the connector.

As described above, the male and female fitting type connector 20 is provided.
Since the male and female mating parts of No. 2 are bonded by the conductive adhesive 25 and the entire male and female mating connector 20 is potted, even if the resin of the potting portion 12 contracts due to the temperature decrease, the conductive bonding is performed. Even if a normal contact pressure is secured in the male / female fitting portion due to the adhesive force of the agent 25, or the normal contact pressure is no longer obtained, the male member is electrically conductive due to the conductive adhesive 25 present in the male / female fitting portion. The conductivity of the female fitting portion is secured. As a result, no conduction failure occurs even when used at low temperatures.

In the control valve electromagnetic coil device 30 constructed as described above, the space 11 is fitted to the outer periphery of the rotor case 52 of the stepping motor 50 fixed to the valve housing 40 of the electric control valve by the lower lid 51. And is positioned by the engagement of the positioning piece 8A and the positioning pin 49 mounted on the valve housing 40.

The valve housing 40 includes a valve chamber 4 having a bottomed hole.
1, an inlet port 42, and an outlet port 43 are formed. A round rod-shaped synthetic resin valve element 44 is rotatably provided in the valve chamber 41. The valve body 44 has a concave groove portion 45 on the outer peripheral portion, and changes communication between the inlet port 42 and the outlet port 43 and shutoff, and a valve opening degree (communication degree) according to the rotational position.

A metal core shaft 46 is vertically inserted into the valve body 44 by insert molding. The mandrel 46 has a bearing recess 52 formed in the ceiling of the rotor case 52 at the upper end.
It engages with A and engages with the bearing bush 47 arranged at the bottom of the valve chamber 41 at the other end.

An upper head portion 48 located in the rotor case 52 is integrally formed on the upper portion of the valve element 44, and a rotor 53 with a permanent magnet (not shown) is fixed to the outer peripheral portion of the upper head portion 48. .

Next, the sealing process of the control valve electromagnetic coil device 30 will be described with reference to FIGS.

(Sealing Step 1) After the injection molding of the sealing molding portion 9 is completed, as shown in FIG. 3, the control valve electromagnetic coil device 30 is turned upside down and conductively bonded to the pin tip portion 21. The agent 25 is applied. The conductive adhesive 25 is a main component made of thermosetting resin such as epoxy resin or polyurethane,
It is a mixture of metallic fillers such as silver and copper.

(Sealing step 2) After the application of the conductive adhesive 25 to the pin tip portion 21 is completed, as shown in FIG.
The tip portion 21 of the pin is inserted into 3B to complete the connector connection, and the cover 10 is covered.

When the connector connection is completed, the entire encapsulation molding part 9 including the cover 10 is preheated to about 80 ° C. to 200 ° C., preferably 90 ° C. to 150 ° C. as a pretreatment for potting with a thermosetting resin. Then preheat. This preheating cures the conductive adhesive 25. The conductive adhesive 25 bonds the contact 23 and the pin tip 21 in a conductive state.

(Sealing step 3) After the preheating is completed, as shown in FIG. 5, a thermosetting resin such as epoxy resin or polyurethane is poured into the inside of the cover 10 to pot the connector connection portion, and the potting is performed. The thermosetting resin of the part 12 is cured by heating. This completes the sealing process of the control valve electromagnetic coil device 30.

The preheating step for the potting portion 12 is carried out in order to accelerate the hardening of the potting material (thermosetting resin) and prevent the generation of bubbles. In this case, epoxy resin, polyurethane or the like is used. This is also a curing step for the conductive adhesive 25 whose main component is the thermosetting resin, and it is not necessary to separately provide a curing step for the conductive adhesive 25.

FIG. 6 shows another embodiment of the electromagnetic coil device for a control valve according to the present invention. In addition, in FIG. 6, the portions corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and the description thereof will be omitted.

In this embodiment, the male / female fitting portion of the male / female connector 20, that is, the pin tip portion 21 and the contact 23 are bonded by the conductive adhesive 25, as in the above-described embodiments. In addition, the entire portion including the male and female fitting type connector 20, that is, the entire area of the cover 10 is potted with a thermosetting resin having electrical insulation such as epoxy resin or polyurethane (potting portion 12). Is hermetically sealed.

Also in this embodiment, the potting portion 12
Conductive adhesive 2 even if the resin in
Even if a normal contact pressure is secured in the male / female fitting portion by the adhesive force of 5, or the normal contact pressure is no longer obtained, the conductive adhesive 25 existing in the male / female fitting portion causes the male / female to be electrically conductive. The continuity of the fitting portion is secured. Also,
In this embodiment, the whole is potting-sealed, so that the injection molding process can be omitted.

The electromagnetic coil device 30 for the control valve
In addition to potting the connector connection part, the same can be applied to cast coils entirely molded with thermosetting resin such as epoxy resin.In addition to stator coils for stepping motors, coils for solenoid devices can also be used. Can be similarly applied to.

[0037]

As can be understood from the above description, according to the electromagnetic coil device for a control valve of the present invention, the male and female fitting portions of the connector are bonded by the conductive adhesive and the entire connector is electrically connected. By being sealed with an insulating resin, even if the sealing resin contracts due to a decrease in temperature,
Even if a normal contact pressure is secured in the male and female fitting parts due to the adhesive force of the conductive adhesive, or even if normal contact pressure cannot be obtained, the conductivity due to the conductive adhesive present in the male and female fitting parts Since the conductivity of the male and female fitting parts is secured,
The reliability of electrical continuity of the connector portion can be improved without causing a large increase in component costs and man-hours, and there is no fear of electrical continuity failure even under low temperature use.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing one embodiment in which the electromagnetic coil device for a control valve according to the present invention is applied to a stator coil device of an electric control valve driven by a stepping motor.

FIG. 2 is an enlarged sectional view showing a main part of a control valve electromagnetic coil device according to the present invention.

FIG. 3 is a sectional view showing a sealing step 1 of the electromagnetic coil device for a control valve according to the present invention.

FIG. 4 is a cross-sectional view showing a sealing step 2 of the electromagnetic coil device for a control valve according to the present invention.

FIG. 5 is a sectional view showing a sealing step 3 of the electromagnetic coil device for a control valve according to the present invention.

FIG. 6 is a cross-sectional view of an essential part showing another embodiment of the electromagnetic coil device for a control valve according to the present invention.

[Explanation of symbols]

1, 2 stator coil 7 square pins 9 Sealing molding part 10 covers 12 potting section 20 Male-female connector 21 pin tip 23 contacts 25 Conductive adhesive 30 Control valve electromagnetic coil device 40 valve housing 44 valve body 50 stepping motor 52 rotor case 53 rotor

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Claims (6)

[Claims] 1. An electromagnetic coil device for a control valve, wherein a terminal on the coil side and a lead wire for energizing the coil are electrically connected by a male / female fitting type connector, wherein a male / female fitting portion of the connector is a conductive adhesive. An electromagnetic coil device for a control valve, characterized in that it is adhered by, and the whole including the connector is sealed with an electrically insulating resin. 2. The connector has a curl spring piece,
It is a type that has a female contact to which a lead wire is conductively connected, and a male terminal on the coil side by a square pin is inserted and fitted into the female contact, and the male terminal and the female contact are electrically conductive. The electromagnetic coil device for a control valve according to claim 1, wherein the electromagnetic coil device is adhered by a conductive adhesive. 3. The method according to claim 1, wherein a portion other than the connector portion is sealed with an injection molding resin, and the connector portion is sealed with a thermosetting resin by potting. Electromagnetic coil device for control valves. 4. The electromagnetic coil device for a control valve according to claim 1, wherein the entire portion including the connector portion is sealed by potting with a thermosetting resin. 5. A method for sealing an electromagnetic coil device for a control valve, wherein a terminal on the coil side and a lead wire for energizing the coil are electrically connected by a male / female fitting type connector, wherein a male / female fitting portion of the connector is provided. Apply a conductive adhesive,
A method for sealing an electromagnetic coil device for a control valve, characterized in that the male and female fitting portions are adhered with a conductive adhesive, and thereafter the whole including the connector is sealed with an electrically insulating resin. 6. The conductive adhesive is an epoxy resin type,
A base material made of thermosetting resin such as polyurethane is mixed with a metallic filler, and the electrically insulating resin for sealing is a thermosetting resin. The method for sealing an electromagnetic coil device for a control valve according to claim 5, wherein the conductive adhesive is cured by a preheating step of the sealing portion.