JPH0328219Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric flow control valve used for controlling the flow rate of fluid such as refrigerant in a cooler.

A conventional flow control valve of this type is shown in FIG. (Utility Model Application No. 59-88572) However, in the case of such an electric flow control valve, when the stator coil 1 is energized, the rotor 2 rotates, and the thread between the male thread 4 of the valve stem 3 and the female thread 6 of the propulsion bearing 5 is Due to the action, the valve shaft 7 and rotor 2 rotate and move in the axial direction, and accordingly, the valve seat 8 and the valve body 9
The distance between the valve seat 8 and the valve body 9 is connected to the rotor 2, and the male thread 4 of the valve stem 3 is in a state where the flow control valve is closed.
and the female thread 6 of the propulsion bearing 5 are screwed together, so the rotor 2
A thrust force is generated by converting the rotational force generated by electromagnetic action into the axial direction by the screw engagement, and an axial thrust force generated because the rotor 2 absorbs the energy stored as rotational kinetic energy and stops the rotor 2. do.
However, since both the valve seat 8 and the valve body 9 have high rigidity, they will receive a large axial thrust. This causes the rotational frictional resistance between the contact surfaces to become excessive, and the electromagnetic rotational force generated in the rotor 2 will no longer be able to perform the next valve opening operation. Further, since the valve body 9 bites into the valve seat 8, wear of the valve seat 8 and the valve body 9 is accelerated.

When the valve is opened, the end of the valve stem 3 opposite to the valve body 9 hits the bearing stand 10, making it impossible to start in the valve closing direction for the same reason as on the valve closing side, resulting in the loss of the valve opening/closing function. be.

In order to eliminate this drawback, stopper A,
A' and a stopper pin B are provided to transfer the electromagnetic rotational force and rotational kinetic energy of the rotor 2 to the stoppers A, A' and the stopper pin B as contact force in the rotational direction of the rotor 2.
A mechanism is added to generate the signal between the pins B and stop it. In such a stopping mechanism, it is necessary to keep the screwing relationship between the male screw 4 and the female screw 6 and the mechanical relationship between the stoppers A, A' and the stopper pin B correct. Particularly on the valve closing side, it is also necessary to simultaneously satisfy the position where the valve seat 8 and the valve body 9 come into contact. This is not only extremely difficult mechanically, but also causes damage to the valve seat 8 and valve body 9.
The disadvantage is that the valve's closing performance is easily lost due to wear.

Also, in the conventional method, the valve stem 3 connected to the rotor 2
The male thread 4 of the main body 11 is screwed into the female thread 6 of the propulsion bearing 5 fixed to the main body 11, and the male thread 4 is rotated in synchronization with the rotational movement of the rotor 2, so that the amount of movement of the valve body 9 in the opening/closing valve direction is It is proportional to the rotation angle of the rotor 2, and it is not possible to provide movement with any other pattern.

The present invention was devised to solve the above-mentioned problems.According to the present invention, the rotor rotates when the stator coil is energized, a first flow path, and a valve communicating with the first flow path. A valve body provided with a second flow path having a seat is provided with an inclined surface on one side of the base fixed to face the rotor, and a spiral groove is provided on the other side, and a ball is fitted into this groove. The rotor is brought into contact with the inclined surface and deflected toward the base side by spring pressure, and as the rotor rotates, the balls move within the groove, causing the rotor to move up and down, and the operation of the rotor moves the valve body toward the valve seat. It is designed to be opened and closed against.

One embodiment shown in the drawings will be explained below.
11 is a valve body having a first flow path 12 and a second flow path 13 communicating with the first flow path 12. Both flow paths communicate with each other via a valve chamber 14 provided within the valve body 11.

A base 15 is fixed to the side of the valve body 11 facing the second flow path 13. The surface of the base has an inclined surface 16 that is lower toward the center and higher toward the periphery. A cover 17 made of a non-magnetic material and having an inverted top shape is fixed to the inclined surface 16 side of the base 15, and a stator coil 18 is provided around the outer periphery of this cover. A rotor 19 is provided within the cover 17 and rotates when the stator coil 18 is energized. One surface of this rotor faces the base 15 and has a spiral groove 20 on this surface. 21 is a ball inserted into this groove 20.

Reference numerals 22 and 23 are spring receivers provided opposite to each other; one spring receiver 22 is fixed to the inner surface of the cover 17, and the other spring receiver 23 is in contact with the rotor 19 via washers 24 and 25. is washer 24,2
5 is made of a material with low frictional resistance (for example, polytetrafluoride erylene resin), so that when the rotor 19 rotates, it will slip between the contact surfaces of the washers 24 and 25.

A spring 2 is provided between the spring receiver 22 and the spring receiver 23.
6 is inserted, and the rotor 19 is pressed toward the base 15 by the elasticity of the spring 26 via the spring receiver 23, washers 24, 25, and ball 21.

A valve rod 27 is inserted into the center of the rotor 19,
A valve body 28 is provided at its tip, and this valve body 28 faces the valve seat 29 of the valve chamber 14 . Valve stem 27
The end opposite to the valve body 28 is inserted into the spring receiver 22 and is screwed into the spring receiver 23 by a screw 30. Further, the screwing position between the spring receiver 23 and the screw 30 is fixed after being adjusted to a proper screwing position. 31 indicates the inner end of the spiral groove 20, and 32 indicates its outer end.

Next, the operation of the flow control valve configured as described above will be described. When the stator coil 18 is energized, the rotor 19 rotates in a specified direction, and this rotation causes the balls 21 to roll, for example, in the direction of the outer circumference of the rotor 19 along a spiral groove 20 provided in the rotor 19.

However, since the inclined surface 16 of the base 15 is highly inclined toward its peripheral edge, the ball 21
As a result of the rolling, the rotor 19 and the spring receiver 23 rise in the figure against the elasticity of the spring 26. As the rotor 19 rises, the valve stem 27 screwed into the spring receiver 23 also rises by the amount of change in the axial direction of the inclined surface 16, and the valve element 28 separates from the valve seat 29 and opens.
Fluid corresponding to this valve opening amount is caused to flow from the first flow path 12 to the second flow path 13.

Next, when the stator coil 18 is energized in the opposite direction, the rotor 19 rotates in the opposite direction, and the balls 21 move in the spiral groove 20 from the periphery toward the center in the opposite direction. Roll. Due to this rolling of the ball 21, the rotor 19 moves downward in the figure due to the elasticity of the spring 26, and the valve stem 27 also moves in the same direction by the amount of change in the axial direction of the inclined surface 16, so that the valve body 28 approaches the valve seat 29. This will restrict the flow rate of the fluid. In the above explanation, the case where the sloped surface 16 is provided on the base 15 and the spiral groove is provided on the rotor 19 is explained, but even if the spiral groove is provided on the base side and the sloped surface is provided on the rotor side, the operation is still the same. It doesn't change. As described above, according to the present invention, the mechanical thrust acting on the valve stem 27 is only the elasticity of the spring 26, and when the rotor 19 absorbs the electromagnetic rotational force generated by the rotor 19 and the rotational kinetic energy stored in the rotor 19. The rotational force generated in the valve stem 27 is only a rotational force that rotates the rotor 19 around the valve stem 27, and does not have a direct effect on the valve stem 27 as a thrust force. position,
In other words, when the ball 21 is at the inner end 31 or outer end 32 of the groove 20, it has no effect on the thrust force applied to the valve stem 27, and when the valve is closed, the ball 21 is at the inner end 31 or the outer end 32 of the groove 20. It rotates around the rotation axis of the rotor 19 while contacting the rotor 31,
The radius of revolution of the ball 21 does not change. Therefore, in the valve closed state, the valve rod 27 is kept at a constant position without moving in the axial direction, and the thrust applied to the valve rod 27 does not change. For this reason, there is no need to forcibly absorb the electromagnetic torque acting on the rotor 19 or the rotational kinetic energy stored in the rotor 19, which was seen in the conventional method. Any surplus thrust other than the thrust due to force and fluid will not act on the valve body 28 and the valve seat 29.

Similarly, at the fully open point, the ball 21 remains positioned at the outer end 32 of the spiral groove 20 and the rotor 19 rotates under the electromagnetic torque in the valve opening direction. Since the operation is the same as that described in , the valve stem 27, rotor 19, ball 2
1 and the inclined surface 16 of the base 15 are the spring force of the spring 26 and the thrust due to the fluid, and no other thrust is applied.

This makes it possible to start from a valve-closed position and from a fully-open valve point without adding a mechanism that forcibly stops the rotation of the rotor 19.

Furthermore, since the axial cross-sectional shape of the inclined surface 16 can be made into any shape within the mechanically permissible range at the time of assembly, the opening characteristics of the control valve can also be set as desired. .

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical cross-sectional view of an embodiment of the electric flow control valve of the present invention, Fig. 2 is an end view of the rotor seen from below, and Fig. 3 is a schematic vertical cross-sectional view of a conventional control valve of this type. be. 11... Valve body, 12... First flow path, 13...
second flow path, 15... base, 16... inclined surface,
17...Cover, 18...Stator coil, 19...
...rotor, 20 ... spiral groove, 21 ... ball, 26 ... spring, 27 ... valve stem, 28 ... valve body, 29 ... valve seat.

Claims (1)

[Scope of utility model registration request] a valve body having a first passage, a second passage communicating with the first passage via a valve seat; a base provided on the valve body; a cover covering the base; a stator coil provided on the outer periphery of the stator coil; a rotor provided on the inner periphery of the stator coil inside the cover with one surface facing the base; and a spring pressed against the rotor in the axial direction by a spring on the other surface of the rotor. a valve stem having one end fixed to the spring receiver and a valve body passing through the rotor and facing the valve seat at the other end; An electric flow control valve having an inclined surface on one side and a spiral groove on the other side, and a ball fitted into the groove to face the inclined surface.