JPH0211981A - Pulse motor driving valve - Google Patents

Abstract

PURPOSE:To aim at the abatement of noises by making the total of unit pulse numbers required for full-close from full-open transform into a link pulse, giving it to a pulse motor, and initializing it. CONSTITUTION:The total number of unit pulses A required for controlling a valve gear 1 into full close from full open is transformed into a link pulse B connecting each pulse width for a portion of plural pieces of the unit pulse, giving it to a pair of coils 10a, 10b of a pulse motor 2. With this constitution, the abatement of excessive pulse numbers is well promotable, and the occurring frequency of a stopper hitting noise and an engaging noise between a valve port 4 and a valve body 7 attributable to the excessive pulse is reducible so that the abatement of these noises is well promotable.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a pulse motor-driven valve in which a valve mechanism is driven by an electric pulse motor, and in particular, to an improved method for initializing the valve opening. This invention relates to a pulse motor driven valve.

(Prior art) Conventionally, as an example of this type of pulse motor driven valve, the third
There is a valve mechanism configured as shown in the figure.
A pulse motor 2 is integrally assembled in the .

In the valve mechanism 1, an inlet pipe 5 is integrally connected to the valve boat 4 side of the valve casing 3, and an outlet pipe 6 is integrally connected to the outlet side of the valve casing 3, and the pointed end of the needle valve body 7 is moved in and out of the valve boat 4. As a result, the opening degree of the valve boat 4 is appropriately controlled.

The other part of the needle valve body 7 (the right end in FIG. 3) watertightly penetrates the partition wall 3a of the valve casing 3 and extends into the rotor chamber 8, where it is coaxially fixed to the rotor 9 of the pulse motor 2. An annular stator 10 is fitted around the outer periphery of the rotor chamber 8, and a pair of coils 10a and 10b of the stator 10 are connected to a valve controller that outputs a pulse waveform valve opening control signal via signal lines (not shown). electrically connected.

As shown in FIG. 4, a thread 11 is cut in the axially intermediate portion of the needle valve body 7, and is screwed into the female thread groove 12 of the partition wall 3a of the valve casing 3 in a watertight manner. The rotation causes the needle valve body 7 to rotate, and its tip reciprocates in the axial direction, thereby controlling the valve opening degree.

The needle valve body 7 is implanted with a full-open stopper piece 13 and a full-open stopper piece 14 partially protruding in the centrifugal direction before and after the male thread 11, and these stopper pieces 13 and 14 are respectively protruded from the inner and outer surfaces of the partition wall 3a. They are respectively received by provided stopper receivers 15 and 16 to regulate the fully open and fully open positions of the valve boat 4.

As shown in Figure 5, the initial valve opening setting of the pulse motor-driven valve configured as described above is from fully open to fully open, or vice versa (hereinafter referred to as fully open 0 fully closed). Apply all the unit pulses A (see Fig. 2) required to drive the needle valve body 7, for example, 100 units, to the coils 10a and 10b of the pulse motor 2 to fully open the valve mechanism 2. It has become.

That is, in order to obtain a fine valve opening, the pulse motor driven valve sends a unit pulse A, in which one square pulse is one unit, to the coils 10a and 10 of the pulse motor 2, as shown in FIG.
By giving b, the valve opening of the valve mechanism 1 is reduced by 1 opening,
Alternatively, the number of unit pulses A required for fully opening the valve mechanism 1 is 100, and
As shown in Fig. 5, if the valve opening is stopped at 80 pulses, the current valve opening is unknown, so when setting the initial opening of the valve mechanism 1, 100 unit pulses are set. A is the coil 10a of the pulse motor 2.

10b to fully open the valve mechanism 1 and initialize it.

(Problem to be Solved by the Invention) However, since the opening degree of the valve mechanism 1 is already at the position of 80 pulses as shown in FIG.
To give 100 of these to the pulse motor 2 is 20 (1
00-80) unit pulse A will be left over.

Therefore, even after the tip of the needle valve body 7 of the valve machine m1 is almost completely inserted into the valve boat 4 and fully opened, the rotor 9 of the pulse motor 2 receives 20 surplus unit pulses 8, and the opening degree is 20 degrees. When trying to rotate the stopper intermittently, it spins idly, and each time, the entire 1!1 stopper piece 14 is removed from the stopper receiver 16.
There is a problem in that not only does the tip of the needle valve body 7 engage with the valve boat 4 and produce a meshing sound, but also that noise is generated intermittently.

The present invention has been made in consideration of the above circumstances, and an object thereof is to provide a pulse motor driven valve that can reduce noise when setting the initial opening degree.

[Structure of the invention]

(Means for Solving Two Problems) That is, the present invention provides a pulse that controls the valve opening degree by driving the valve body of the valve mechanism by the rotor of a pulse motor that rotates intermittently by a required angle every time a unit pulse is received. In a motor-driven valve, the total number of unit pulses required to drive the valve body of the valve mechanism from the fully open position to the fully open position is obtained by continuously combining the pulse widths of multiple unit pulses. The present invention is characterized in that an initial opening degree setting means is provided which transforms the pulse into a connected pulse and applies it to the pulse motor to set the initial opening degree of the valve mechanism.

(Function) When setting the initial opening of a pulse motor-driven valve, the entire number of unit pulses required for the valve mechanism to fully open is transformed into connected pulses by the initial opening setting means and applied to the pulse motor, and the valve mechanism is fully opened. is initialized to .

Since the connected pulse is formed by continuously combining the pulse widths of a plurality of unit pulses, the number of connected pulses given to the pulse motor is apparently smaller than the number of unit pulses.

Therefore, the number of surplus pulses given to the pulse motor is also reduced, so the number of times the stopper hits after the valve mechanism is fully opened and the number of times that the valve boat and the valve body engage are reduced, and the noise caused by the stopper and the number of times that the valve body engages are reduced. It is possible to reduce noise.

(Example) An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows the overall configuration of an embodiment of the present invention, and this embodiment is characterized by the provision of an initial opening degree setting means 20, and other than this, it is almost the same as the pulse motor driven valve shown in FIG. 3. Therefore, parts in FIG. 1 that are common to those in FIG. 3 are given the same reference numerals, and explanations of the overlapping parts will be omitted.

When initializing the valve opening of the valve machine 11, the initial opening degree setting means 20 converts the rectangular unit pulse A shown in FIG.
A pair of coils 10a, 10 of the pulse motor 2
b to fully open the valve.

That is, when initializing the valve opening degree of the valve mechanism 1, since the current valve opening degree is unknown, the total number of unit pulses A required to control the valve mechanism 1 from fully open to fully open, for example 100 pulses, is For now, I will give it to pulse motor 2,
Rather than applying these 100 pulses to the pulse motor 2 in the form of a unit pulse A, the unit pulse A is transformed into a connected pulse B as shown in FIG. 10b.

The connected pulse B is one in which a plurality of unit pulses A, for example, four pulse widths τ are continuously combined, and only the pulse width τa is widened to reduce the number of negative pulses pn. .

Therefore, for example, 10
0 unit pulses A correspond to 1/4 of that, 25 connected pulses B.

Therefore, when initializing the pulse motor driven valve when the valve opening degree of the pulse motor driven valve is at a position of 80 pulses in terms of pulses, as shown in FIG. 25fl equivalent to one serving! The connection pulse B of it is the pair of coils 10a and 1 of the pulse motor 2.
given to 0b.

Therefore, there is a surplus of 5 connected pulses B corresponding to 20 unit pulses A, but while the conventional example has 20 unit pulses, the connected pulse B has only 5 left over.
It is an individual portion.

For this reason, after the valve mechanism 1 is fully opened, the rotor 9 of the pulse motor 2 attempts to rotate by the amount of five surplus pulses, that is, five times, and the full-open stopper 14 hits the stopper receiver 16 five times, causing the rotor 9 to rotate five times. A hitting sound and a meshing sound of the valve boat 4 and needle valve body 7 are emitted.

That is, in this embodiment, it is possible to reduce the stopper contact noise and the engagement noise of the two dollar valve body 7 by the amount by which the pulse width τ of the unit pulse A is combined.

In the above embodiment, the connected pulse 8 has been described in which the pulse widths τ of four unit pulses A are connected, but the number of connected pulses of the unit pulse A is not limited to four, but may be a plurality.

〔Effect of the invention〕

As explained above, the present invention transforms the total number of unit pulses required from fully opening to fully open the valve mechanism into a connected pulse that connects the pulse width of a plurality of unit pulses, and applies the converted pulse to the pulse motor for initialization. Therefore, the number of surplus pulses can be reduced, and the number of occurrences of the stopper hitting noise and the engagement sound between the valve boat and the valve body due to the surplus pulses can be reduced, and noise can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view showing the overall configuration of an embodiment of a pulse motor driven valve according to the present invention, and FIG. 2 shows a unit pulse,
A waveform diagram showing this unit pulse and a connected pulse transformed by the initial opening setting means shown in Fig. 1, Fig. 3 is a vertical cross-sectional view of a conventional pulse motor driven valve, and Fig. 4 is a partial enlargement of Fig. 3. The vertical sectional view, FIG. 5, is a graph showing the relationship between the opening degree of the valve mechanism and the number of unit pulses. DESCRIPTION OF SYMBOLS 1... Valve mechanism, 2... Pulse motor, 4... Valve boat, 7... Needle valve body, 9... Rotor, 13...
... Fully open stopper piece, 14... Fully open stopper piece,
15゜16...Stopper receiver, A...Unit pulse, B...Connection pulse. Figure Figure Figure

Claims (1)

[Claims] In a pulse motor-driven valve that controls the valve opening degree by driving a valve body of a valve mechanism by a rotor of a pulse motor that rotates a required angle intermittently every time a unit pulse is received, the valve body of the valve mechanism is moved from a fully open position. The total number of unit pulses required to drive the valve to the fully closed position is transformed into a connected pulse in which the pulse widths of a plurality of unit pulses are continuously combined and applied to the pulse motor. A pulse motor driven valve characterized by being provided with initial opening degree setting means for setting the initial opening degree of the mechanism.