JPH0636377Y2 - Gas amount control valve - Google Patents

Description

[Field of Use] The present invention relates to a gas amount adjusting valve, and more particularly to an electrically operated gas amount adjusting valve, in which a valve body (needle valve) for adjusting the flow rate of a gas circuit is rotated. This is intended to prevent the valve body from rotating when it is linearly moved, thereby smoothing the operation of the valve body.

[Prior Art and its Problems] Among gas appliances, in appliances such as so-called table stoves, ignition and extinguishing operations are frequently performed, and thermal power is frequently adjusted while the appliances are in use.

In the conventional device of this type, a so-called gas cock is adopted as a gas amount adjusting device for adjusting the thermal power, and by rotating the operation knob of this gas cock, it is possible to adjust to a desired valve opening degree. You can adjust the firepower arbitrarily.

However, in this gas amount adjusting device, the operating torque is large, and it is necessary to set the operating knob to a certain size. For this reason, the gas stove has a problem in that the operating knobs for ignition, extinguishing, and heat power adjustment are large.

As a means for solving such a problem, it is possible to adopt an electric valve, and for example, a configuration as shown in FIG. 5 can be adopted.

As shown in the same figure, this one uses a reversible rotary electric motor (M) output shaft to connect and disconnect a needle valve (1) inserted into a gas circuit with respect to a corresponding valve hole (21). In order to enable this contact and separation operation,
The shaft portion (11) of the needle valve (1) is screw-paired with the constituent wall of the main body (2) forming the gas circuit. In this type, when one operation switch (31) is closed, the electric motor (M) is normally rotated during the closing time and the needle valve (1) is moved in a direction away from the valve hole (21). Therefore, the gas flow rate will be increased. On the contrary, when the other operation switch (32) is closed, the electric motor (M) reverses during this closing time and the needle valve (1) advances to the valve hole (21) side to reduce the gas amount. To be

In the configuration thus configured, the operation switch (31),
Since the amount of gas is adjusted by the operation of (32), there is an advantage that the operation force is light, and since the operation switch is only provided on the operation surface of the instrument, the operation section is also compact in structure. Becomes However, in this case, since the needle valve (1) deals with the main body (2) with a screw, there is a problem that the forward / backward movement of the needle valve (1) is not stable for a long time. .

In the needle valve (1), the shaft portion (11) of the needle valve (1) is screwed against the main body (2), and the sliding portion between the shaft portion (11) and the main body (2) ensures airtightness. If the O-ring (12) is mounted on the shaft (11) as shown in the figure, the electric motor (M) must be installed unless the O-ring mounting area and the screw pair are accurately coaxial. This is because a smooth forward / backward movement of the needle valve (1) due to the rotational force is not obtained. That is, the screw pair portion and the airtight sliding portion rotate together.

[Technical Problem] The present invention is directed to such an electric motor (M) that operates in a forward and reverse direction by selecting a switch operation or an operation switch.
Valve (1) is interlocked with the output shaft of, and the needle valve (1) is moved forward and backward with respect to the valve port (21) to adjust the gas amount. It is an object of the present invention to secure the smooth operation of (1) and facilitate the replacement of the needle valve (1) such as the replacement of gas species.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is that the valve hole (2 is provided on the downstream side of the gas inlet (22) of the main body (2).
1) is provided, the needle valve (1) is arranged so as to face the valve hole (21), and the shaft portion (11) of the needle valve (1) is formed in the body (2). Is fitted in the outer peripheral airtight state in a freely movable manner, and a cam chamber (24) coaxial with this is formed on the outer side of this hole (23). The side wall of this cam chamber (24) is paired with a screw and the electric motor A cam body (14) interlocking with (M) is provided, and the end portion of the cam body (14) and the end portion of the shaft portion (11) are coaxially connected, and the connection of the shaft portion (11) is performed. A disc-shaped head portion (18) is formed at the end following the neck portion (19), and an engaging hole (1) having a lateral opening portion at the connecting end portion of the cam body (14).
7) is formed, and the neck (19) and the head (1) are formed in the engagement hole (17).
8) Rotate and couple 8) in a manner that they are fitted from the side so as to have a radial eccentric allowance, and connect both end faces of the engaging hole (17) in the axial direction and both end faces of the head (18) to the needle valve (1). The end face is perpendicular to the direction of movement.

[Operation] The above technical means of the present invention operates as follows.

When the electric motor (M) is driven in the normal direction or in the reverse direction by selecting the switch operation or selecting the operation switch, the cam body (14) rotates in the normal direction or the reverse direction in response to the forward rotation or the reverse rotation. The needle valve (1) is advanced and retracted by the action of the screw against the side wall of the cam chamber (24). Therefore, by this, the needle valve (1) comes into contact with and separates from the valve hole (21), and the amount of gas passing through the inside of the main body (2) is adjusted.

When the needle valve (1) is moved back and forth, the shaft portion (11) is treated around the cam chamber (24) with a radial movement allowance, so that the hole portion (23) and the cam Even if the chamber (24) is slightly eccentric, the shaft (11) does not seize on the inner peripheral surface of the hole (23), and the airtight sliding of the shaft (11) is smooth. It will be

Further, when converting the gas species, only the shaft portion (11) is replaced, but in this case as well, the head portion (18) of the shaft portion (11) is replaced.
The cam body (1
Since it is connected to 4), this shaft (11) can be easily replaced.

In this way, the head (18) is accommodated from the side, but both end surfaces of the head (18) and both end surfaces of the engagement hole (17) are relative to the moving direction of the needle valve (1). Since the end surfaces are perpendicular to each other, when the cam body (14) reciprocates, the shaft portion (11) is reciprocally driven by the mutual contact of the end surfaces, and the reciprocating movement is smooth. Becomes

[Effects] Since the present invention has the above-mentioned configuration, it has the following unique effects.

Even if the hole (23) and the cam chamber (24) are slightly eccentric, the cam body (14) and the shaft (11) operate smoothly, and the inconvenience of galling at each pair is eliminated. As a result, the capacity of the electric motor (M) can be set small.

Further, when changing the gas species, only the needle valve (1) is exchanged and this exchange is easy. Therefore, the work for this gas species conversion is simple, and the above-mentioned effect is obtained even when this is secured. Not damaged.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the embodiment shown in the figure, the cam body (14) is transmitted to the electric motor (M) through the reduction mechanism (K) composed of a large number of gears, and the hole (23) is provided downstream of the gas inlet (22). The solenoid valve (4) is inserted on the upstream side of FIG.

The cam body (14) is housed in the cam chamber (24) formed in the upper part of the main body (2), and realizes screw handling between the cam body (14) and the side wall of the cam chamber (24). Therefore, the cam body (1
4) is a cylindrical body, and a groove (15) that opens to the outer peripheral side is arranged in the body in a spiral shape, and this groove (15) is planted at a specific point on the side wall of the cam chamber (24). The tip of the pin (16) is inserted. As a result, when the cam body (14) rotates, it moves back and forth in the axial direction according to the degree of inclination of the concave groove (15).

Next, the lower part of the cam body (14) is formed with an engagement hole (17) having a U-shaped cross section, the upper part of which has a large diameter and the lower part of which has a smaller diameter. The head portion (18) and the neck portion (19) formed on the upper end of the portion (11) are fitted to each other, and the cam body (14) and the shaft portion (11) are rotated and connected to each other. As described above, the connecting portion is in a fitted state with a radial allowance, and as shown in FIG. 2, the engaging hole (17) is opened to the side of the cam body (14). Cage, head (1
Inserting 8) and neck (19) through this side opening,
It is connected to the above state. The head portion (18) is formed in a disk shape, and both end faces are perpendicular to the axis. Further, both end surfaces of the upper half of the engagement hole (17) for accommodating the head portion (18) are also perpendicular to the axis of the cam body (14).

Therefore, when the cam body (14) reciprocates in the axial direction due to the rotation, one of both end surfaces of the head (18) and one of both end surfaces of the upper half of the engaging hole (17) are in contact with each other. In this state, the reciprocating force is applied from the cam body (14) to the needle valve (1).

An O-ring (12) is mounted in the middle of the shaft portion (11) to ensure the airtightness of the sliding portion of the hole (23).

The needle valve (1) is a trapezoidal valve body formed at the tip of the shaft portion (11), and a continuous portion with the shaft portion (11) has a small diameter portion having a hole opening in the radial direction. A leak hole (10) communicating with the hole is formed coaxially with the needle valve (1). Therefore, the needle valve (1)
Even when the valve is in contact with the valve hole (21), the gas inlet (22) and the gas outlet (25) communicate with each other through the above (10), and the gas amount in the minimum throttle state is set to be constant. The Rukoto. Also, the shaft part (1) equipped with the needle valve (1)
The exchange of 1) enables the conversion of gas species.

Particularly, in the above embodiment, the cam chamber (24) has the main body (2).
The pin (16) is formed so as to penetrate through and be fixed to the wall surface of the tubular portion, and the hole formed in the lower portion of the cam body (14) is Two
As shown in the figure, since it has a U-shaped cross section, the shaft portion (11) and the cam body (14) are assembled by fitting before mounting the reduction gear mechanism (K), and this assembly is fitted with a hole portion ( 23) When the cam body (14) is housed in the cam chamber (24) and the pin (16) is fixed through the cam body (14) in a predetermined posture, these are incorporated into the main body (2) and mounted in a retaining state. It will be.

Next, the electrical control of the electric motor (M) and the solenoid valve (4) will be described in detail.

In this embodiment, the electric motor (M) is set to be reversibly operated by the two operation switches (31) and (32), and a push button type switch is adopted as these operation switches. These operation switches (31) and (32) are, as shown in FIG. 3, an electric motor (M).
This drive circuit is connected to the drive circuit of the electric motor (M) when the operation switch (31) is closed, and the electric current in the forward rotation direction of the electric motor (M) is supplied to the drive circuit. A current in the direction of rotation is supplied.
A potentiometer (P) is interlocked with the output shaft of the speed reduction mechanism (K) driven by the electric motor (M), and the potentiometer according to the rotation angle of the output shaft, that is, the cam body (14). The output value from (P) changes. This output value is given as a voltage change, and the output value of the maximum voltage level is output when the opening of the needle valve (1) reaches the maximum opening, and conversely, in the minimum throttle state, the minimum output value is output. The output value of the voltage level is output.

The output of the potentiometer (P) indirectly detects the opening degree of the needle valve (1) and is input to the first comparison calculation circuit (33) and the second comparison calculation circuit (34). The first and second comparison operation circuits (33) and (34) are
When the opening of the needle valve (1) reaches a predetermined opening (first set opening) near the maximum opening and when it reaches a predetermined opening (second set opening) near the minimum opening The voltage applied to the first setting resistor (35) for setting the first set opening and the voltage applied to the potentiometer (P) are the first comparison arithmetic circuit (33). ), And the voltage applied to the second setting resistor (36) for setting the second setting opening is input to the other second comparison operation circuit (34).

The output of the first comparison operation circuit (33) is a first shunt circuit (37) for shunting the current of the motor drive circuit applied to the electric motor (M) through the operation switch (31) at a predetermined timing. Is input to the base of the first transistor (T ₁ ) inserted in the electric motor (M) via the operation switch (32).
Is inputted to the base of the second transistor (T ₂ ) inserted in the second shunt circuit (38) for shunting the current of the motor drive circuit applied to the circuit at a predetermined timing.

With the above configuration, in this embodiment, when the operation switch (31) is closed to operate to open the opening of the needle valve (1), the opening is the first set opening. Then, due to the output from the first comparison operation circuit (33), the first transistor (T ₁ ) becomes conductive and the current applied to the electric motor (M) is shunted through the second setting resistor (36). . As a result, after this time point, the electric current applied to the electric motor (M) is reduced and the rotational torque of this motor is reduced. As a result, the opening speed of the needle valve (1) becomes low. Conversely, when the operation switch (32) is closed to reduce the opening of the needle valve (1), when the opening reaches the second set opening, the output of the second comparison calculation circuit (34) causes (T ₂ )
Becomes conductive, the electric current applied to the electric motor (M) is shunted through the second shunt circuit (38), and the rotation torque of the motor is reduced to decrease the needle valve (1) as in the above case.
The squeezing speed becomes slower.

As described above, in this embodiment, the opening of the needle valve (1) changes from the first set opening in the vicinity of the maximum opening to the maximum opening direction, and from the vicinity of the minimum opening to the minimum opening direction. Since the moving force of the needle valve (1) at the time of the change of the throttle becomes low and the moving speed thereof is set to be slower than the opening changing speed in other areas, when the minimum opening is set. Even when the needle valve (1) comes into contact with the valve hole (21), the impact force at the time of this contact is small and problems such as damage to the valve body do not occur. Further, even when the electric motor (M) is prevented from rotating in the minimum opening state, the current flowing through the coil of this motor is small, so that an excessive current flows through the coil and the motor is damaged. Does not occur.

In this embodiment, an opening limit setting device (5) separate from the above is added, and when the operation switch (31) is closed and the needle valve (1) is opened,
When the opening reaches the maximum opening, the opening limit setting device (5) cuts off the electric power supply to the electric motor (M), and conversely, the operation switch (32) is closed to close the needle valve. When the throttle operation of (1) is performed, the electric power supply to the electric motor (M) is cut off when the opening becomes the minimum opening. The solenoid valve (4) is opened and closed by the main switch (40) and functions as a main valve, and the main switch (40) functions as a power switch.

The opening limit setting device (5) will be described in more detail below.

A third comparison arithmetic circuit (51) and a fourth comparison arithmetic circuit (52) are adopted as a configuration for setting the maximum opening and the minimum opening, and these third, fourth comparison arithmetic circuits (51), ( The output from the potentiometer (P) is input to 52), and the voltage applied to the third setting resistor (53) for setting the comparison voltage to a predetermined value is applied to one of the third comparison operation circuits (51). Is input to the other fourth comparison operation circuit (52).
The voltage applied to the setting resistor (54) is input. The voltage applied to the third setting resistor (53) is set so as to match the voltage applied to the potentiometer (P) when the needle valve (1) is in the maximum opening state, and the other The voltage applied to the fourth setting resistor (54) is set to match the voltage applied to the potentiometer (P) when the needle valve (1) is in the minimum opening state. The output from the third comparison operation circuit (51) is input to the first cutoff means (55), and the output from the fourth comparison operation circuit (52) is input to the second cutoff means (56). ing. Incidentally, the shut-off means is provided with corresponding normally-closed output contacts (57), (58) until a reset input is received after a predetermined signal is input.
To maintain the open state.

With the above configuration, when the opening degree of the needle valve (1) reaches the maximum opening degree, the output from the third comparison calculation circuit (51) is generated, the normally closed output contact (57) is opened, and the electric motor (M When the opening of the needle valve (1) reaches the minimum opening, the output from the fourth comparison operation circuit (52) is generated and the normally closed output contact (58) is opened. The circuit to the electric motor (M) is broken, and the electric motor (M) is stopped in any case.

In the case of the above potentiometer (P), the rotation angle of the input shaft and the resistance value as its output value are
Although it changes as shown in FIG. 4 and a part which does not become a liner occurs at both ends thereof, in the above embodiment, the resistance of the potentiometer (P) corresponding to the maximum opening of the needle valve (1) and the needle The resistance of the potentiometer (P) corresponding to the minimum opening of the valve (1) is adjusted so that it is located within the linear change region in FIG.
The relationship between the change in the opening degree of P and the change in resistance of the potentiometer (P) is set.

Therefore, in the case of this embodiment, the opening of the needle valve (1) detected by the potentiometer (P) is always accurate and stable.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along line XX, FIG. 3 is an explanatory diagram of an electric circuit diagram thereof, and FIG. 4 is a view showing a change in angle of an input shaft of a potentiometer (P). The relationship diagram with output resistance and Fig. 5 are explanatory diagrams of the conventional example. In the figure, (1) …… Needle valve (11) …… Shaft (14) …… Cam body, (2) …… Main body (21) …… valve hole, (22) …… gas inlet (23) …… hole, (24) …… cam chamber

Continuation of the front page (72) Creator Masahiko Yukimura 2-26 Fukuzumicho, Nakagawa-ku, Nagoya-shi, Aichi Rinnai Co., Ltd. (56) References: 61-164870 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A needle valve (1) is interlocked with an output shaft of an electric motor (M) which operates in a forward and reverse direction by selecting a switch operation or an operation switch, and the needle valve (1) is connected to a valve hole (21). In the gas amount regulating valve that adjusts the gas flow rate by advancing and retracting the valve, a valve hole (21) is provided on the downstream side of the gas inlet (22) of the main body (2) so as to face the valve hole (21). A hole (23) in which a needle valve (1) is arranged and a shaft (11) of the needle valve (1) is formed in a main body (2).
The outer periphery is airtightly fitted in the hole and the hole (23)
A cam chamber (24) coaxial with the cam chamber (24) is formed on the outer side of the cam chamber (24), and a cam body (14) which is paired with the side wall of the cam chamber (24) and works with the electric motor (M) is provided. The end of (14) and the end of the shaft (11) are coaxially connected to each other, and the connecting end of the shaft (11) is connected to the neck (19), followed by a disk-shaped head (18). An engaging hole (17) having a lateral opening is formed at the connecting end of the cam body (14), and a neck (19) and a head (18) are provided in the engaging hole (17). The mating parts are fitted in a pair so that they have a radial eccentricity allowance, and the two end faces of the engaging hole (17) in the axial direction and the end faces of the head part (18) are moved in the moving direction of the needle valve (1). A gas amount control valve with an end face that is perpendicular to the.