JPH0144868Y2 - - Google Patents

Description

[Detailed description of the invention] This invention rotates a drive shaft by the rotation of the rotor of a motor housed in the lower case, and a threaded shaft integrated with the drive shaft is screwed into the valve body to move it forward and backward.
In devices that control the flow rate of refrigerant by controlling the opening amount of the valve body and valve seat at the tip of the screw shaft, when the upper case is fixed to the lower case, the conductor provided on the upper case can be easily connected to the motor and stator at the same time. The present invention relates to an electric flow rate control valve that is capable of controlling the flow rate.

Conventionally, this type of electric flow control valve has a printed circuit board 4 connected to a winding 3 of a stator 2 of a motor housed in a lower case 1, as shown in part in FIG. coated wires 5, 6
(Only two are shown in the diagram.) Connect one end,
Terminals 7 and 8 are connected to each other end by caulking or the like, and when the upper case 11 having the conductive wires 9 and 10 is fixed to the lower case, the conductive wires are inserted and connected to the respective terminals.

In such a conventional connection between a conducting wire and a terminal, the covered wires 5 and 6 must be relatively long and must be made of a material that will not be corroded by the refrigerant, making it expensive. do not have.

In addition, in the case of such a long covered wire, when bonding the upper case 11 and the lower case 1, it is done manually so as not to contact the inner wall of the upper case 11, but the work efficiency is very low. Even though I was careful, the covered wire sometimes came into contact with the inner wall of the upper case.

If the upper case 11 is bonded (usually welded) to the lower case 1 while they are in contact with each other, the heat will melt the covered wires, and in severe cases, the wires will be exposed and bonded to the upper case, preventing electrical leakage. Cause.

However, such an abnormal condition cannot be discovered unless it is tested after welding, and work management is very difficult.

The present proposal was devised in view of the above points, and according to the present proposal, the lower case has a first passage, a second passage,
A lower bearing integral with a valve body having a valve seat is supported, and a stator, a winding of this stator, a rotor, and a drive shaft are housed, and a threaded shaft integral with the drive shaft and facing the valve seat is attached to the valve body. In the device that is screwed together and supports the upper bearing that pivotally supports the drive shaft together with the conducting wire in the upper case and the lower bearing, a printed circuit board connected to the winding is provided in the upper case, and a holding piece connected to this printed circuit board is provided. The gist is that a terminal is connected so as to face the conductive wire through the conductive wire, and the conductive wire is connected to the terminal.

That is, in accordance with this proposal, when the upper case is hermetically bonded to the lower case by welding or the like, the conductors provided in the upper case are simultaneously connected to the stator windings via terminals etc. while being separated from the lower case. It is possible to reliably eliminate the drawbacks of

The present invention will be explained below using an embodiment shown in FIG. Reference numeral 21 denotes a lower case, and a lower bearing 24 integrally formed with the valve body 23 is fixed to the bottom 22 of this case by welding or the like. This valve body 23 has a first passage 25 and a second passage 26 through which the refrigerant passes.
A valve seat 2 is connected to the valve port 27 that connects the two passages.
It has 8. Further, a stator 29 and a rotor 30 are housed inside the lower case 21. 31 indicates a stator winding. A drive shaft 32 is fixed to the rotor 30, and the lower part of the drive shaft 32 is connected to the lower bearing 2.
It is pivoted on 4. A screw shaft 33 is integrally connected to the lower end of the drive shaft 32, and the screw shaft 33 is screwed into the valve body 23. 34 indicates a valve body at the lower end of the screw shaft 33, which is opposed to the valve seat 28.

An inner insulating material 35 and an outer insulating material 36 are provided on the inner and outer peripheral edges of the winding 31, respectively. 37
is connected to the winding 31 by a printed circuit board, and a protruding portion 38 on the periphery of the lower surface thereof is fixed between the respective insulating materials by appropriate means.

Holding pieces 39 and 40 made of appropriate conductive material are fixed to a plurality of locations (only two locations are shown in the figure) on the upper surface of the printed circuit board 37 using solder or the like. 41,4
Reference numerals 2 indicate terminals, which are connected to the respective holding pieces 39 and 40. Reference numeral 43 denotes an upper case, and an upper bearing 45 is fixed to the central lower surface of the upper surface 44 of the upper case so as to face the lower bearing 24, and pivotally supports the upper part of the drive shaft 32.

Further, a plurality of conductive wires 46 and 47 (only two are shown in the figure) are sealed to the peripheral edge of this upper surface 44 by glass sealing 48 and 49. These conducting wires are arranged so as to face the terminals 41 and 42, respectively. Therefore, this upper case 43
When fixed to the lower case 21 by welding or the like, the conductive wires 46 and 47 are simultaneously connected to the respective terminals 41 and 42.

Next, the function as a flow control valve will be briefly explained. Assuming that the temperature of the evaporator (not shown) rises above a predetermined value, a signal is applied from the control unit to the winding 31 via the conductors 46, 47, the terminals 41, 42, the holding pieces 39, 40, and the printed circuit board 37. If the motor is a stepping motor, the rotor 30 rotates in one direction by a predetermined amount, and the screw shaft 33 rotates via the drive shaft 32, but in this case, it retreats from the valve seat 28 and pumps a large amount of refrigerant to the evaporator. The temperature is controlled at the specified temperature.

In addition, when the temperature of the evaporator falls below a predetermined value, the screw shaft 33 moves forward in the direction of the valve seat 28, and the screw shaft 33 moves forward in the direction of the valve seat 28, thereby restricting the flow rate of the refrigerant and controlling the temperature to a predetermined value.

However, according to the present invention, even if bare conductors are used for the conductors 46 and 47, the terminals 41 and 47 can be reliably connected during assembly.
42 but does not come into contact with the inner surface of the upper case 43, the workability is good, the drawbacks of the conventional methods are eliminated, and a highly reliable wiring connection can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal cross-sectional view of the electric flow control valve of the present invention, and FIG. 2 is a schematic vertical cross-sectional view of a portion of the conventional control valve showing an assembled state. 21...Lower case, 24...Lower bearing, 25
...First passage, 26...Second passage, 28...
Valve seat, 29... Stator, 30... Rotor, 31
... Winding wire, 32 ... Drive shaft, 33 ... Screw shaft, 3
7... Printed circuit board, 39, 40... Holding piece, 4
1,42...terminal, 45...upper bearing, 46,4
7... Conductor.

Claims (1)

[Scope of utility model registration request] The lower case supports a lower bearing integral with a valve body having a first passage, a second passage, and a valve seat, and houses a stator, a winding of the stator, a rotor, and a drive shaft, and is integral with the drive shaft. A screw shaft facing the valve seat is screwed into the valve body, a conductive wire is provided in the upper case, and a print connected to the winding wire is provided in the upper case to support an upper bearing that pivotally supports the drive shaft together with the lower bearing. An electric flow control valve comprising: a circuit board; a terminal connected to the printed circuit board so as to face the conductive wire through a holding piece; and the conductive wire connected to the terminal.