KR100540806B1 - Flow control device - Google Patents

Abstract

The object of the present invention is to provide a flow control device capable of controlling the flow rate with high accuracy without generating a noise by adopting a new valve opening and valve drive mechanism.

In order to solve this problem, in the flow rate control device 1, an opening 5 connecting the upstream side and the downstream side of the fluid flow path, and a valve body for controlling the flow rate of the fluid by controlling the opening area of the opening 5. (6) and a valve drive device (3) for moving the valve body (6) with respect to the opening portion (5), the valve drive device (3) includes a stepping motor as a drive source and rotation of the output shaft (35) of the motor. Is provided with the transmission mechanism 70 which consists of a gear row which converts and transmits the valve body 6 in the direction which approaches the opening part 5, and the direction which separates. The valve body 6 has a tip shape with a tapered diameter toward the opening portion 5, and the front end portion 62 of the front end penetrates into the opening portion 5 to adjust the opening degree.

Description

Flow control device {FLOW CONTROL DEVICE}

1 is a plan view, a front view and a bottom view of a flow control device to which the present invention (A) (B) (C) is applied.

2A and 2B are a plan view in a closed state and an open state of a mechanism part disposed in a case of a flow control apparatus to which the present invention is applied, respectively.

3 is an exploded view of a gear train and the like illustrated in FIG. 2.

4 is a graph showing a relationship between a valve body position and a flow rate in a flow control apparatus to which the present invention is applied.

※ Explanation of symbols about main part of drawing ※

1: flow controller 2: housing

3: valve driving mechanism 4: plate

5: opening 6: valve element

8: moving body 11: upstream side

12: downstream 26: fluid inlet

27: fluid outlet 30: stepping motor (drive source)

35: output shaft of stepping motor 61: base on flange of valve body

62: tip of valve body 63: rubber seal

70: delivery mechanism 71: primary

72: second

The present invention relates to a flow rate control device for controlling the flow rate of various fluids. More specifically, the present invention relates to a valve mechanism of a flow control device.

The valve mechanism used for the flow control apparatus which controls the flow volume of the refrigerant | coolant or liquid in LP gas, city gas, a refrigerator, or an air conditioner generally drives a valve body by a solenoid.

However, since the solenoid performs valve opening and closing control by repetition of on and off, there is a problem in that the on and off operation is frequently performed when high flow rate control is performed, resulting in a noise. In addition, as a problem inherent to solenoids, chattering occurs, and when such a state falls, high-precision control becomes impossible.

An object of the present invention to solve the above problems is to provide a flow control device that can control the flow rate with high precision without the occurrence of joints or chattering by the adoption of a new valve mechanism and valve drive mechanism.

In order to solve the above problems, in the present invention, an opening connecting the upstream side and the downstream side of the fluid passage, a valve body for adjusting the flow rate of the fluid passing through the opening by adjusting the opening area of the opening, and the valve body A flow rate control device having a valve drive device that moves relative to the opening portion, wherein the valve drive device transfers the motor as a drive source and converts the output of the motor into a direction in which the valve body approaches and is separated from the opening. The valve body has a tip shape with a tapered diameter toward the opening, and is driven in a direction intersecting with the output shaft of the motor, so that the leading tip portion is approached when the valve body approaches the opening. It is characterized by penetrating into the opening.

In the present invention, the valve driving device transfers the output of the motor to the valve body, for example, and moves the valve body in a direction approaching and spaced apart from the opening.

In the present invention, since the motor is used as a driving source of the valve drive device for moving the valve body relative to the opening, unlike the configuration for controlling the solenoid on and off, no noise or chattering occurs. In addition, since the tip of the valve body penetrates into the opening, the opening degree of the opening is adjusted, so that the flow rate can be controlled with high precision and simple configuration.

In the present invention, it is preferable that the valve body is driven to draw a circular arc trajectory by the valve driving device, and the opening is preferably an inlet for receiving the valve body in the circumferential direction. In this configuration, since the output of the motor is transmitted to the valve body in the state of rotational movement, the configuration of the transmission mechanism can be simplified as compared with the method of directly moving the valve body, and the energy loss is small.

In the present invention, it is preferable that the tip of the valve body bends along the trajectory on the arc of the valve body. In this way, since the valve body does not interfere with other parts, the stroke of the valve body can be set long, and when set in this way, the flow rate can be easily adjusted.

In this invention, it is preferable that the said transmission mechanism is arrange | positioned on the opposite side to the closing position of the said valve body as seen from the rotation center axis line when the said valve body is driven. Such a configuration facilitates a wide area for arranging the valve element and the delivery mechanism, thereby facilitating the layout. In addition, foreign matter in the flow path becomes difficult to attach to the mechanism part.

In the present invention, it is preferable that at least one of the valve body and the opening is configured with a seal elastic member to surround the opening. In this way, the opening can be sealed with certainty.

When configured in this manner, the valve driving device is driven in a state in which the seal elastic member is driven in a direction in which the seal elastic member is compressed more than the closed state in which the circumference of the valve body and the opening are in close contact with the seal elastic member. It is preferable to set it as an origin position. This home position must be obtained at power-on, and at any time thereafter, at appropriate intervals or at every operation.

In this invention, it is preferable that the said valve body and the said transmission mechanism are accommodated in the sealed space other than a flow path.

Next, a flow control apparatus to which the present invention is applied will be described with reference to the drawings.

(Overall configurations)

1 (A) (B) (C) are a plan view, a front view and a bottom view of a flow control apparatus to which the present invention is applied. 2 (A) and (B) are all plan views showing the layout of the mechanical parts arranged in the casing of the flow control apparatus to which the present invention is applied, of which a closed state is shown in FIG. The open state is shown in B). 3 is a developed view of a gear train and the like illustrated in FIG. 2A (B). 4 is a graph showing a relationship between a valve body position and a flow rate in the flow rate control device of this embodiment.

1 (A), (B) and (C), the flow rate control device 1 to which the present invention is applied is used for flow rate control of LP gas, city gas, refrigerator, or refrigerant in an air conditioner.

In the flow control device 1, a housing sealed by a cup-shaped case 21 having a flange portion, a lid member 22 and a rubber packing 23 sandwiched between the lid member 22 and the case 21. (2) is formed. In the cover member 22, the cylindrical part 24 which arrange | positions the rotor 31 etc. of the stepping motor 30 protrudes upwards, and the stator 33 of the stepping motor 30 is located outside the cylindrical part 24. Is placed.

The fluid inlet 26 is opened in the side part of the housing 2, and the fluid outlet 27 is open in the bottom part.

As shown in Figs. 2 and 3, the housing 2 has a bottom portion of the plate 4 as the partition wall 40, an upstream side 11 on which the fluid inlet 26 is located, and a cylindrical fluid outlet ( It is divided into the downstream side 12 in which 27 is located, and the partition 40 is provided with the opening part 5 which connects the upstream side 11 and the downstream side 12. The inlet 5 located in the upstream side 11 opens in the transverse direction (circumferential direction), while the outlet located in the downstream side 12 opens downward in the opening 5.

On the inlet side of the opening part 5, the valve body 6 in which the tip part 62 of the shape in which the tip is extended toward the tip end from the flange-shaped base 61 is arrange | positioned.

In the valve body 6, the rubber seal 63 (sealing elastic member) is fixed to the front side of the base 61 so as to wind the tip portion 62, and the closed state shown in Fig. 2A is shown. Has secured its confidentiality. In the closed state, the valve body 6 has the tip portion 62 penetrating into the opening 5 and the base 61 is the rubber seal 61 through the rubber seal 63. It is in close contact with the inlet periphery of 5).

On the other hand, in the open state shown in Fig. 2B, the valve body 6 is in a position retracted from the opening portion 5, and is spaced apart from the periphery of the inlet circumference of the base 61 and the opening portion 5, and the tip portion ( 62 is in the state which came out from the inside of the opening part 5.

And in those intermediate states, a part of the tip part 62 of the valve body 6 is in the state which penetrated inside the opening part 5, and is opened by the clearance gap between the tip part 62 and the opening part 5. The degree is adjusted.

Here, the direction shown by the arrow A in FIG.2 (A) (B) is the closed direction, the direction shown by the arrow B is the open direction, and the valve body 6 is the valve drive apparatus 3 demonstrated below. Is driven in a direction intersecting with the output shaft 35 of the stepping motor 30, as shown by arrows A and B, and the arc-shaped trajectory is moved around the output shaft 35 of the stepping motor 30. Draw. Therefore, in this embodiment, the tip portion 62 of the valve body 6 is curved in correspondence to the arc-shaped trajectory of the valve body 6, while the planar shape of the opening 5 is also the arc-shaped trajectory of the valve body 6 and the valve. It has a planar shape curved corresponding to the curved shape of the tip portion 62 of the sieve 6.

In this embodiment, in order to drive the valve body 6 in the direction shown by the arrow A and the arrow B, the valve drive apparatus provided with the stepping motor 30 which can be rotated in both directions, and the transmission mechanism 70 which consists of gears. (3) is driven, and the transmission mechanism 70 is arrange | positioned in the cup-shaped case 21. As shown in FIG.

In the valve drive device 3, the output shaft 35 of the stepping motor 30 is rotatably supported by the receiving portion of the plate 4. Moreover, in the side position of the output shaft 35, the transmission mechanism 70 is equipped with the primary 71 which has the outer tooth which meshed with the pinion which was fixed to the output shaft 35, and this primary 71 is carried out. The second position 72 is provided at the lateral position of the second vehicle 72 having an outer tooth engaged with the pinion fixed to the rotation shaft of the primary car 71.

On the other hand, along the inner circumferential wall of the plate 4, the partition 40 which is the bottom thereof is formed with a guide groove 44 in the circumferential direction, and an arcuate moving body 8 is disposed on the guide groove 44.

The movable body 8 is provided with the inner tooth which engages with the pinion fixed to the rotating shaft of the secondary 72 in the arc-shaped inner peripheral side, and the said valve body 6 is integrally formed in the end surface.

〔action〕

In the flow control device 1 configured as described above, when the output shaft 35 of the stepping motor 30 rotates in the counterclockwise circumferential CCW direction from the closed state shown in FIG. It rotates in CW direction, and the 2nd order 72 rotates in the direction of anticlockwise rotation CCW. As a result, the movable body 8 also rotates in the direction of the anticlockwise circumference CCW, and the valve body 6 is driven in the open direction as shown by the arrow B (see FIG. 2 (B)). In the meantime, the opening degree 5 gradually increases from the closed state and the flow rate gradually increases according to the moving distance of the valve body 6.

4, the flow rate flowing out of the fluid outlet 27 via the opening 5 from the fluid inlet 26 is linearly corresponding to the number of steps of the stepping motor 30 and the angular position of the valve body 6. To change.

On the other hand, when the output shaft 35 of the stepping motor 30 rotates in the clockwise circumferential CW direction from the open state as shown in FIG. 2 (B), the first car 71 rotates in the counterclockwise circumferential CCW direction, and the second car ( 72) rotates in the direction of the clock circumference CW. As a result, the movable body 8 rotates in the direction of the clockwise circumference CW, and the valve body 6 is driven in the closed direction as indicated by the arrow A (see FIG. 2 (A)).

At this time, the valve driving device 3 is driven in the direction in which the rubber seal 63 is compressed more than the closed state in which the inlet circumference of the valve body 6 and the opening 5 is in close contact with the rubber seal 63. Set the state to the home position of the closed state.

[Effect of this form]

As described above, in this embodiment, since the motor is used as the driving source of the valve driving device 3 which moves the valve body 6 with respect to the opening portion 5, unlike the configuration for controlling the solenoid on and off, the joint or chattering is performed. Does not occur. Moreover, since the opening part of the opening part is adjusted by intruding inside the opening part of the front end part 62 of the valve body 6, flow rate control can be performed with a simple structure and high precision.

In addition, since the rotation of the output shaft 35 of the motor is transmitted to the valve body 6 in the state of rotational movement, the structure of the transmission mechanism 70 can be simplified and the energy can be simplified as compared to the method of directly actuating the valve body 6. Low loss Further, since the tip portion 62 is curved along the trajectory on the arc of the valve body 6, the valve body 6 does not interfere with other parts. In addition, since the stroke of the valve body 6 can be set long, the flow rate can be adjusted with high accuracy.

Further, the transmission mechanism 70 is disposed on the side opposite to the closing position of the valve body 6 as viewed from the rotational center axis when the valve body 6 is driven. For this reason, the area | region which arrange | positions the valve body 6 and the opening part 5, and the area | region which arrange | positions the delivery mechanism 70 are large. In addition, the layout of each component can be easily performed.

In addition, the valve driving device 3 is driven in a direction in which the rubber seal 63 is compressed more than a closed state in which the inlet circumference of the valve body 6 and the opening portion 5 is in close contact with the rubber seal 63. Set the state to the home position of the closed state. Because of this, the fluid can be completely shut off, and the flow can be controlled with the zero flow rate completely at the origin. In order to obtain such an origin, it is always performed at power-on, but thereafter, at an appropriate interval from time to time and at every operation.

[Other embodiments]

Although the valve body 6 side was driven among the valve body 6 and the opening part 5 in the said form, the structure which fixes the valve body 6 and drives the side of the opening part 5 may be sufficient. Moreover, what is necessary is just to arrange | position to at least one of a valve body side and an opening side about sealing elastic members, such as rubber seal.

Moreover, in the said form, although the structure which adjusts the opening degree of one opening part 5 is arrange | positioned, you may control a flow volume by arrange | positioning several opening parts and converting the combination of the opening-closing state into the valve body 6.

In addition, the driving method of the valve body 6 is not limited to the rotation system as mentioned above, but may be a linear motion system or a structure in which the screw-shaped valve body 6 moves in the screw groove while rotating.

Moreover, although the stepping motor 30 was used as a drive source in the said form, DC motor or AC motor may be used, and when using such a motor, what is necessary is just to perform time control, performing time control or position recognition instead of step control.

The fluid to be controlled by the flow rate is not limited to gas but may be liquid.

 As described above, in the flow control apparatus according to the present invention, since the motor is used as a driving source of the valve driving apparatus for moving the valve body relative to the opening, unlike the configuration of turning on and off the solenoid, it is possible to prevent the occurrence of joint or chattering. Does not cause Moreover, since the opening degree of an opening part is adjusted by intruding into the inside of an opening part, the front end part of a valve body can control a flow volume with a simple structure and high precision.

Claims (8)

An opening connecting the upstream side and the downstream side of the fluid passage, a valve body for adjusting the flow rate of the fluid passing through the opening by adjusting the opening area of the opening, and a valve driving for moving the valve body relative to the opening. In a flow control device having a device, The valve drive device includes a motor as a drive source, and a transmission mechanism for converting the output of the motor into a direction in which the valve body approaches the opening and a space apart from the opening, and the valve body is thinner toward the opening. It has a forward tip shape and is driven in a direction intersecting with the output shaft of the motor to approach the opening, and the leading tip portion penetrates into the inside of the opening, and the valve driving device reads the output of the motor. Transfer to the valve body to move the valve body in a direction approaching and away from the opening, The valve body is driven to draw a circular arc trajectory by the valve driving device, And the opening is an inlet for receiving the valve body in the circumferential direction. delete delete The method of claim 1, The valve body is a flow control device, characterized in that the tip portion is curved along the trajectory on the arc of the valve body. The method of claim 1, And the transmission mechanism is disposed on the side opposite to the closed position of the valve body as viewed from the rotational center axis when the valve body is driven. The method of claim 1, And at least one of the valve body and the opening is configured with a seal elastic member surrounding the opening. The method of claim 1, The valve driving device may be a home position of the closed state in a state in which the circumference of the valve body and the opening are driven in the direction in which the seal elastic member is compressed more than the closed state in which the seal elastic member is in close contact. Flow control device, characterized in that. The method of claim 1, And said valve body and said delivery mechanism are housed in a closed space other than a flow path.

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