JPS6342217Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is an electronically controlled expansion valve used during the refrigeration cycle of room air conditioners, car air conditioners, etc.
Or it relates to a proportional control valve used in combination with a microcomputer in the general industrial field.

[Prior Art] A valve port 2 is provided in a valve body 1 as shown in FIG. In the conventional proportional control valve, which controls the flow rate by changing the gap between the valve opening and the needle valve, the valve shaft 4 and the rotor 6 of the motor are integrated, and the tip of the valve shaft 4 has a A needle valve 3 is formed, and a thread 7 is formed on the valve shaft at the rear of the rotor, a bearing metal 8 is placed on the bearing portion 5 of the valve shaft in front of the rotor, and a valve thread 7 is provided on the rear male thread 7. A female screw 10 fixed to the rear end of a rotor case 13 made of a non-magnetic material is brazed to the main body 1, and a fixed coil 9 of the motor is installed at a position corresponding to the rotor 6 of the motor on the outer periphery of the case. is provided.

Therefore, when the fixed coil 9 of the motor is energized, the rotor 6 rotates, and the valve shaft 4 rotates and moves in the axial direction due to the screw action of the male screw 7 and the female screw 10, and as a result, the valve shaft 4 rotates and moves in the axial direction. The gap formed between the mouth 2 and the needle valve 3 changes to open the fluid inlet/outlet 11,
The amount of fluid flowing between 12 is controlled.

[Problem to be solved by the invention] In such an integrated configuration of the valve shaft and rotor, the rotor 6 also moves simultaneously with the axial movement of the valve shaft 4, so a method is required to cope with this axial movement. In addition, the axial dimension of the rotor 6 needs to be larger than the width dimension of the fixed coil 9, and it is also necessary to form a space in the casing that can move forward and backward of the rotor, so the entire proportional control valve This has the drawback that the axial dimension is long, making it impossible to downsize.

[Means for solving the problem] The present invention eliminates the above-mentioned drawbacks.
As shown in FIG. 2, a valve port 2 is provided in the valve body 1, and a needle valve 3 formed integrally with the valve shaft is exposed to the valve port portion. In a proportional control valve that controls the flow rate by changing the gap between the valve stem 4 and the needle valve 3, the needle valve 3 is formed at the tip of the valve stem 4, and the middle part of the valve stem is formed with a male thread 7, and the rear end The receiving part 5' is formed into a D-shaped cross section or a spline shape, and the central male thread 7 is formed.
A motor rotor 6 with a female thread formed at the center is screwed into the part, and a bearing metal 8 is arranged in the bearing part 5 in front of the rotor so that one end is in contact with one side of the rotor. The rotor case 1 made of a non-magnetic material is brazed to the valve body at the end receiving part 5'.
An end receiving metal 14 fixed to the rear end of the case is arranged so that one end thereof contacts one side of the rotor, and the end receiving part is provided so as to be slidable only in the axial direction, and the rotor on the outer periphery of the case A valve port 2 is provided within a valve body 1 in which a fixed coil 9 of a motor is provided at a position corresponding to 6.

End support metal 14 and cross section D in the above embodiment
The combination of the letter-shaped end receiving part 5' is made by driving a pin 15 or a kotsuta from the side of the end receiving metal along the D-shaped flat part of the end receiving part 5', as illustrated in Figures 2 and 3. This makes it impossible to rotate and allows movement only in the axial direction. In another embodiment, the cross sections of the end receiving metal 14 and the end receiving portion 5' are combined in a spline shape as shown in FIG. 4, so that no rotation occurs between the two and only axial sliding occurs. It can also be made possible.

Furthermore, as an airtight structure near the bearing part 5 and the bearing metal 8 of a part of the valve shaft 4, an O-ring 16 may be installed as shown in FIG. By installing the seal mechanism 17, it is possible to prevent the vicinity of the male thread 7 from being contaminated by the fluid to be controlled.

[Operation] In the present invention, when the fixed coil 9 of the motor is energized, the rotor 6 rotates. Since the rotor 6 is restrained by the bearing metal 8 and the end bearing metal 14 so that it cannot move in the axial direction, the rotor 6
The valve shaft 4, which is threadedly connected to the central internal thread, moves in the axial direction. Therefore, the gap between the valve port 2 and the needle valve 3 is controlled by controlling the amount of current applied to the motor.

[Effects of the Invention] In the present invention, as described above, the center of the rotor 6 is made female and the male thread 7 of the valve shaft is screwed into it, and the support state between the end receiving part 5' and the end receiving metal 14 is made non-rotatable and only allows sliding in the axial direction, so that the motor rotor 6 is always in the same position relative to the motor's fixed coil 9. This makes it possible to shorten the axial dimension of the proportional control valve, thereby reducing manufacturing costs and reducing installation restrictions, making it highly valuable in industry.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a conventional proportional control valve. Second
The figure is a longitudinal side view of the proportional control valve of the present invention. Fig. 3 is a partial view taken along the line A-A in Fig. 2, Fig. 4 is a partial view of another embodiment corresponding to Fig. 3, and Figs. 5 and 6 are a partial view of the bearing metal part in Fig. 2. Detailed sectional view. 1...Valve body, 2...Valve port, 3...Needle valve, 4...Valve stem, 5...Bearing part, 6...Motor rotor, 7...Male thread, 8...Bearing metal, 9...Motor fixed coil,
10...Female thread, 11, 12...Fluid inlet/outlet, 13
...Case, 14...End holder metal, 15...Pin, 16
...O-ring, 17...Bellow-like seal mechanism.

Claims (1)

[Scope of utility model registration request] A valve port 2 is provided in the valve body 1, and a needle valve 3 formed integrally with the valve shaft faces the valve port portion, and the gap between the valve port and the needle valve 3 is changed by controlling the power supply to the motor. In the proportional control valve for controlling the flow rate, a needle valve 3 is formed at the tip of a valve stem 4, the middle part of the valve stem is formed with a male thread 7, and the end receiving part 5' at the rear end has a cross section. A motor rotor 6 formed in a D-shape or spline shape and having a female thread at the center is screwed into the male thread 7 in the center, and a bearing metal 8 is attached to the bearing part 5 in front of the rotor with one end thereof. An end receiving metal 14 fixed to the rear end of the rotor case 13 made of a non-magnetic material and brazed to the valve body is disposed so as to be in contact with one side of the rotor, and the end receiving portion 5' at the rear end is made of a non-magnetic material and is brazed to the valve body. is arranged so that one end thereof is in contact with one side of the rotor, and the end receiving part is provided so as to be slidable only in the axial direction, and the fixed coil 9 of the motor is placed at a position corresponding to the rotor 6 on the outer periphery of the case. A proportional control valve characterized by being provided with.