JPH04136572A - Tubular valve - Google Patents

Abstract

PURPOSE:To accurately control the opening and closing of the flow passage and flow rate and pressure in the flow passage of a flow passage system even an external force works by installing a magnet on at least either a valve body or a rotor. CONSTITUTION:An opening 13 is formed being cutout toward inside in one side of the lower part of a valve body 3. A flexible tubular body 12 is placed on a base 14 in this opening 13, and secured in the valve body 3. In addition, in order to accurately control flow rate and pressure, a magnet 15 is mounted on the inner surface of the valve body 3 opposing to a rotor 5. Since the rotary motion of a motor 1 is thus converted into the vertical motion of a plunger 7 and pressing part 11 by the screws 6 and 8 between the rotor 5 and plunger 7, rotary motion is accurately converted into vertical motion, and the mobility of the plunger 7 and pressing part 11 are minutely controlled in excellent resolution. Moreover, even if external force works on a flow passage system, the magnet 15 prevents the screws 6 and 8 from loosening holds the rotor 5 at a given location and accurately control flow rate and pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tubular valve that is useful in constructing a flow path system that requires sanitary properties, such as a flow path system for chemical equipment, bio-related equipment, etc. .

[Issue 8 to be solved by the prior art and the invention] In order to open and close a flow path in a flow path system and to control the flow rate and pressure of the flow path, a solenoid valve having a metal valve seat and a valve, and a hydraulically driven valve are usually used. Type and motor-driven valves are commonly used.

However, with electromagnetic valves that are controlled by opening and closing flow channels, it is difficult to accurately control flow rate and pressure.

In addition, since valves have functional parts such as valve seats and valves inside them, when applied to flow path systems such as bio-related equipment, bacterial cells and chemical solutions may remain in the flow path system, resulting in sanitary properties. descend. In addition, because the connection between the valve body and the pipe body is complicated, it is not possible to construct a sterilized or sterilized flow path system within a short time, and there is a high possibility that the bacterial cells and drug solution will be contaminated with bacteria during handling. . Therefore, electromagnetic valves and the like cannot be applied to flow path systems such as bio-related devices that require maintenance of sterile conditions.

Therefore, as shown in FIG. 9, manual tubular valves equipped with flexible tubes are used in the flow path systems of bio-related devices. FIG. 9 is a sectional view showing a conventional manual tubular valve.

This tubular valve has a flexible tube (61) and a cylinder (62) made of synthetic resin such as polyacetal. The flexible tube body (61) is connected to the cylinder body (62
) can be inserted through piping holes (63) formed on both sides of the pipe. The flexible tube (61) is inside the cylinder (62).
), the sealing protrusions (84
a) (64b) is formed. One of the sealing protrusions (64a) is formed on a spring piece (65) that constitutes a part of the side of the cylinder (62). This spring piece (65)
A claw (66) formed at the tip of the cylinder (62) engages with a ratchet (67) of an extension extending from one end of the cylinder (62).

In such a manual tubular valve, the spring piece (
By locking the pawl (66) of 65) on the ratchet (67), opening and closing of the flexible tube (61) can be controlled.

However, when the manual tubular valve is used to configure a flow path system for a bio-related device, for example, the flow rate and pressure of the fluid in the flow path system can be controlled in stages depending on the locking position of the claw (66) and the ratchet (67). It is difficult to finely adjust the flow rate and pressure, and it is not suitable for automatic control.

Furthermore, after inserting the flexible tube (61) into the piping hole (63), it is necessary to lock the pawl (66) to the ratchet (67), so the attachment of the flexible tube (61) is difficult. Work becomes complicated. In this case, a flexible tube body (6
Due to 1), the flow path system of the bio-related device cannot be configured easily and quickly, and there is a high possibility that the sterilized flexible tube body (61) will be contaminated.

Without locking the wind (66) to the ratchet (67), the rotational movement of the rotational drive source is controlled by a screw, a cam, etc.
The flexible tube body (6
It is also possible to press 1). However, external forces such as vibrations usually act on the flow path system. When an external force such as vibration is applied, even if the flexible tube is closed by pressing with a suppressing member, the flexible tube loosens and fluid leaks. On the other hand, in order to prevent fluid leakage, it is necessary to always hold the pressing member in a predetermined position by the rotational force of the rotational drive source.

In this case, it is not economical because it is necessary to constantly supply current.

Furthermore, when the flexible tube is pressed by a pressing member, the flexible tube is likely to be damaged by the impact force acting on the flexible tube. In particular, if the same location on the flexible tube is repeatedly pressed, the degree of damage to the flexible tube increases and it becomes unusable within a short period of time.

Therefore, it is an object of the present invention to prevent fluid from remaining in the flow path system, which is excellent in sanitary properties, and to accurately control the opening/closing of the flow path of the flow path system and the flow rate and pressure of the flow path even when external force is applied. The object of the present invention is to provide a tubular valve that can be well controlled.

Another object of the present invention is to avoid contaminating the flexible tube.
It is an object of the present invention to provide a tubular valve that can easily and quickly configure a flow path system.

Still another object of the present invention is to provide a tubular valve in which the degree of damage to the flexible tube is small and the flexible tube can be used for a long period of time.

[Means and Operations for Solving the Problems] In order to achieve the above object, the present invention provides a valve body to which a flexible tube can be attached, and a rotary valve provided in the valve body and extending inside the valve body. A motor having a shaft capable of forward and reverse rotation, a rotating body attached to the rotating shaft, a bearing rotatably supporting the rotating shaft or the mounting part of the rotating body to a valve body, and a bearing screwed onto the rotating body. and a plunger whose rotation is regulated, the tubular valve having a magnet attached to at least one of the valve body and the rotating body.

Unlike conventional valves, this tubular valve does not require the provision of functional parts such as a valve seat or valve inside the tube, and the flexible tube is deformed by the pressure of the plunger. can function as a valve. Therefore, there is no need to use a joint to connect the valve and the pipe body.
There is little risk that the flexible pipe body will be contaminated. Furthermore, since the flexible tube can be attached to the valve body, the flow path system can be configured quickly. Furthermore, by reciprocating the plunger using a motor that can be reciprocated, the opening degree of the flexible tube can be adjusted.
In other words, the opening and closing of the channel and the flow rate and pressure of the channel can be automatically adjusted. At that time, even if an external force such as vibration is applied,
The rotating body can be held at a predetermined location on the valve body by the magnetic force of the magnet attached to at least one of the valve body and the rotating body.

Note that the magnetic force of the magnet changes depending on the distance between the magnet and the valve body or rotating body. Further, depending on the positional relationship between the magnet and the rotating body, the rotating body may continue to rotate even after the motor stops rotating, and the plunger may move slightly. Furthermore, the flexible tube creeps to some extent as a result of being pressed. Therefore, the pressing force against the flexible tube may vary.

In such a case, if a spring member is interposed between the valve body and the pressing part of the plunger, the spring member backs up the flexible tube and applies appropriate clamping force to the flexible tube. I can do it.

Further, the plunger is formed in a hollow cylindrical shape, a space between the valve body and the rotating body communicates with the outside through a vent hole formed in the valve body, and a space inside the cylindrical plunger is If the plunger is in communication with the outside through a vent hole formed in the plunger, the impact force acting on the flexible tube can be alleviated. That is, the space between the valve body and the rotating body expands and contracts in volume as the cylindrical plunger reciprocates. In this case, the vent hole communicating with the outside allows the plunger to smoothly reciprocate under atmospheric pressure, and there will be no adverse effects such as grease leakage on the bearing. Moreover, when the plunger is reciprocated to press the flexible tube, the volume of the hollow space of the plunger increases and becomes negative pressure. A vent hole is provided in the plunger to adjust the value of this negative pressure. Since the moving speed of the plunger decreases as it approaches the flexible tube, the impact acting on the flexible tube can be alleviated, damage to the flexible tube can be prevented, and the life of the plunger can be extended.

Furthermore, when at least one of the vent hole formed in the valve body and the vent hole formed in the hollow cylindrical plunger is closed by a check valve, the flow direction of the fluid in the plunger can be regulated, so that the impact acting on the flexible tube body can be further alleviated.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the tubular valve of the present invention, and FIG. 2 is a side view of the main part of FIG. 1.

This tubular valve is powered by a drive motor (1
), a valve body (3) with a polygonal cross section to which the drive motor (1) is attached, and a valve body (3) located within the valve body (3) and attached to the rotation shaft (2) of the drive motor (1). The rotating body (5) and the rotation axis (2) of this rotating body (5)
The attachment to the valve body has a bearing (4) rotatably supporting the part to the valve body (3). Note that the bearing (4) may rotatably support the rotating shaft (2) to the valve body (3).

A feed screw (6) is formed on the outer surface of the rotating body (5).

A cylindrical plunger q) having a threaded hole formed on its inner surface is screwed into the feed screw (6) of the rotating body (5). In order to restrict the rotation of this plunger q), a side portion of the plunger (7) is provided with a slide groove (9) that is slidable in a sliding groove (9) formed in the longitudinal direction on the inner wall of the valve body (2). A convex portion (10) is formed.

Further, at the lower end of the plunger (7), a hollow flexible tube made of a flexible material such as silicone resin (
A suppressing portion (11) having a substantially U-shaped cross section that presses the flexible tube (12) is formed in a direction perpendicular to the axial direction of the flexible tube (12). Since the rotating body (5) and the plunger q) whose rotation is regulated are screwed together at the screw (6) (81 part),
By rotating the drive motor (1) in forward and reverse directions,
The rotational motion of the rotating body (5) can be converted into the reciprocating motion of the plunger q) and the pressing portion (11) in the vertical direction. The amount of movement of the plunger (7) and the pressing part (11) corresponds to the number of rotations of the drive motor (1).

One side of the lower end of the valve body (3) is cut inward to form an opening (13). Using this opening (13), the flexible tube (12) is placed on the base (14) and installed in the valve body (3). The fluid flowing inside the flexible tube (12) is as follows:
Not only liquids such as bacterial cells, culture fluids containing drug solutions, and water, but also gases can be used.

In order to accurately control the flow rate and pressure, a magnet (15) is attached to the inner surface of the valve body (3) facing the rotating body (5). Further, a convex portion (19) is formed at a portion of the rotating body (5) that faces the magnet (5). Furthermore, the base (
14) and the bottom cover (1B) of the valve body (3),
A disc spring (17) is interposed.

A buffer packing (18) is provided at the bottom of the inner surface of the plunger σ) in order to reduce the impact with the end surface of the rotating body (5) as the plunger (7) moves back. There is.

In such tubular valves, the plunger (
The reciprocating direction, mobility, and moving speed of the pressing part (11) in 7) can be adjusted by the rotational direction, number of rotations, and rotational speed of the drive motor (1). Therefore, opening/closing, flow rate, and pressure of the fluid flowing through the flexible tube (12) attached to the valve body (3) can be controlled with high accuracy. That is, when the flexible tube (12) is attached to the valve body (3) through the opening (13) and the drive motor (1) is rotated in the forward direction, the rotating body (5) is rotated. Feed screw (
6) pushes down the plunger ('7). The pressing part (11) of this plunger (7) presses the flexible tube (12) between it and the base (14) and gradually blocks the internal flow path of the flexible tube (12). . In this case, the flexible tube (12) itself functions as a packing and exhibits effective sealing performance. When the drive motor (1) is reversed, the internal flow path of the flexible tube (12) is gradually opened, contrary to the above.

In particular, the screws (6) (8) between the rotating body (5) and the plunger q) convert the rotational movement of the motor (1) into vertical movement of the plunger (7) and the pressing part (11). Because of this, rotational motion can be converted into vertical motion with high precision.
The mobility of the plunger (7) and the pressing part (11) can be finely adjusted with good resolution. Moreover, even if an external force acts on the flow path system, the magnet (I5) will cause the screw (6) to
(8) can be prevented from loosening, the rotating body (5) can be held at a predetermined position, and the flow rate and pressure can be controlled with high precision. Furthermore, depending on the positional relationship between the magnet (15) and the convex portion (19) of the rotating body (5), the plunger q) may move slightly or creep may occur in the flexible tube (12). However, in this case, the disc spring (17) can hold the flexible tube body (I2) at a uniform and predetermined pressure.
The pressing force by the pressing part (11) can be kept constant. Furthermore, the disc spring (17) can improve the cushioning properties.

Further, a part of the flexible tube (12) can function as a valve portion without using a joint to connect the valve and the tube as in the conventional case. Furthermore, as before,
There is no need for a valve seat or a valve, and only the inner surface of the flexible tube body (12) comes into contact with the liquid, so no chemical liquid remains and the sanitary properties are extremely good.

In addition, the flexible tube (12) can be installed inside the valve body (3) by a simple operation of inserting the flexible tube (12) from the opening (18), so it can be sterilized by autoclaving or the like. The treated flexible tube (12) can be easily and quickly attached to the valve body (3), and the flow path system can be configured quickly. Therefore, there is little risk that the flexible tube (I2) will be contaminated by external germs.

In addition, in the tubular valve, the disc spring (]I
7 is not necessarily necessary, and various spring members such as a helical compression spring may be used in place of the disc spring (17).

The tubular valve only needs to have the magnet (15), and an appropriate number of magnets are attached to the valve body (3).
) and the rotating body (5) at intervals in the circumferential direction. Furthermore, if the valve body (3) or the rotating body (5) facing the magnet is not a paramagnetic or magnetic material, the valve body (3) or the rotating body (5)
Only the convex portion (19) provided in 5) may be made of a paramagnetic material or a magnetic material and may be mounted facing the magnet. Furthermore, in order to increase the holding force by the magnet, the gap between the magnet and the paramagnetic material or the magnetic material may be set to be minute.

The flexible tube (12) can be used for a long period of time by shifting the pressing position by the suppressing part (11).

FIG. 3 is a longitudinal sectional view showing another embodiment of the tubular valve of the present invention. Note that the same elements as those shown in FIGS. 1 and 2 will be described with the same reference numerals.

In the example shown in Fig. 3, the valve body (3) and the rotating body (5)
A space A between the valve body and the valve body communicates with the outside through a vent hole (21) formed in the valve body (3). Moreover, the space B within the cylindrical plunger (force) communicates with the outside through a vent hole (22) formed in the plunger (7).

In such a tubular valve, the plunger ('7) located at the top dead center is lowered as the rotating body 6) rotates by driving the drive motor (1) to rotate in the normal rotation direction. . At that time, the valve body (3) and the rotating body (5)
) and the space B in the hollow part of the hollow cylindrical plunger ω have a large volume. The space A is
Since it communicates with the outside through the vent hole (21) of the valve body (3), in space A, the plunger (7)
It moves smoothly under atmospheric pressure, and no excessive load is applied to the bearing (4). On the other hand, the space B in the hollow part of the hollow cylindrical plunger q) becomes negative pressure as the volume increases. Then, as the plunger (7) approaches the bottom dead center, the negative pressure increases, so the forward movement speed of the plunger (7) decreases, and the suppression part ( 1]) can be alleviated. Therefore, even if the same location of the flexible tube (12) is pressed, the flexible tube (12)
It can be used for a long time by preventing damage to the product. Furthermore, when the drive motor (1) is rotated in the reverse direction, the return speed becomes smaller as the drive motor approaches the top dead center, as described above. Further, when the plunger (7) reaches the top dead center, the shock and collision noise with the plunger (7) can be alleviated by the buffer packing (18).

Note that the drive motor (1) is preferably constituted by an electric motor having a linear load-rotational speed characteristic, for example, a DC motor.

Furthermore, in order to reduce the impact force on the flexible tube (12), the rate of volume change that occurs as the plunger q) reciprocates is increased, and the plunger (7) reaches its top dead center. It is preferable to reduce the residual volume. Figure 4 shows
It is a longitudinal cross-sectional view showing still another example of the tubular valve of the present invention.

In this example, by forming the rotating body (35) into an anchor type cross section, the plunger σ when located at the top dead center is
) is made smaller. In this case, as large flow resistance acts on the plunger (7) as the plunger (7) reciprocates, the flexible tube (12)
The moving speed when pressing can be further reduced.

FIG. 5 is a longitudinal sectional view showing another embodiment of the tubular valve of the present invention.

In this example, the hollow cylindrical plunger (7) screwed into the hollow cylindrical rotating body (45) has a vent hole (22) formed in the same manner as described above. ,non-return valve(
41). This check valve (41) closes in one direction, in this example, in the downward direction of the plunger σ), so that it reduces the moving speed of the plunger (7) when pressing the flexible tube (12). It can be made even smaller.

Note that the check valve (41) may close one side of the vent hole (22) of the plunger (7). In addition to the plunger q), one side of the vent hole (21) formed in the valve body (3) may be closed by a shutoff valve. Furthermore, a vent hole may be formed in the hollow rotating body (45), and one side of the vent hole may be closed with a check valve. The installation of the check valve depends on the position of the plunger (7
) can be adjusted when moving forward or backward.

Although the valve body (3) may have a cylindrical cross section, it is preferably a polyhedron with a triangular or larger cross section in order to facilitate attachment to the unit box of the flow path system.

The valve body (3) can be mounted in any appropriate direction, not just horizontal or vertical, by providing screw holes at appropriate locations on its polygonal surface.

It is sufficient that the flexible tube (12) can be attached to the valve body (3). For example, without forming the opening (18), the flexible pipe body (1
2) may be formed with an insertion hole through which it can be inserted.

Further, the opening (13) and the insertion hole are connected to the valve body (3).
) can be formed in place.

In order to regulate the rotation of the plunger σ), the first
Contrary to the embodiment shown in the figures, a convex portion may be formed on the inner wall of the valve body (3), and a sliding groove in which the convex portion can slide may be formed on the plunger ('7).

The flow rate and pressure of fluid are proportional to the degree of opening of the flexible tube (12), and the tubular valve has the following characteristics. That is, when the pressing portion by the suppressing member is small, that is, when the degree of deformation of the flexible tube (12) is small, the opening area of the flexible tube (I2) is not so small, and the flow rate and pressure are small. Changes are small. and,
After the flexible tube (1-2) is deformed to such an extent, even if the degree of compressive deformation is minute, the opening area changes significantly and the flow rate and pressure increase. In a tubular valve having such characteristics, in order to finely adjust the flow rate and pressure, it is necessary to miniaturize the amount of movement of the pressing member.

In order to accurately control the amount of movement of the pressing member, it is preferable that the motor capable of forward and reverse rotation be a control motor that can precisely adjust the flow rate without any permission, particularly a stepping motor or a servo motor. When such a control motor is used, it is easy to control the number of rotations and the direction of rotation.

In particular, in the case of a stepping motor, since it can rotate according to the number of command pulses from the drive circuit, the rotation angle resolution is high and the amount of movement of the pressing member can be controlled with high precision.

Furthermore, in order to control the amount of movement of the plunger with higher precision, the precision of the screws (6) (8) between the rotating body (5) and the plunger (7) may be increased. When the conversion mechanism is configured with a highly accurate screw, rotation by a stepping motor or the like can be converted into reciprocating motion with high accuracy, and the resolution of the mobility of the plunger ω can be further improved.

Further, in order to prevent the pressing member from being displaced due to the reaction force of the flexible tube, it is preferable that the twist angle θ of the screw is 6° or less, which is the self-locking angle.

When the screw is formed at such an angle, loosening of the screw due to the reaction force S of the flexible tube can be prevented, and the moving position of the plunger can be maintained.

Note that when the screw torsion angle is set below the self-locking angle, the screw will not loosen due to the reaction force S of the flexible tube, but the screw will loosen due to external force such as vibration acting on the flow path system. It may come loose.

That is, as shown in FIG. 6, when an external force acts, a reaction force S of the flexible tube acts in a direction perpendicular to the screw surface depending on the screw angle θ due to the moving force F. As a result, the force P acting on the screw surface momentarily decreases, and the screw may loosen. Even in this case, the magnet (15) can ensure the holding torque and prevent the screw from loosening.

In addition, in order to prevent the screws from loosening due to the action of external force, for example, torque due to the magnetic attraction force or repulsion force of the stepping motor, that is, detent torque when no current is applied,
Or the holding torque when energized can be used.

Furthermore, a DC commutator motor having a permanent magnet may be used as the forward/reverse motor. In this case, the position of the plunger may be held using the permanent magnet without skewing the armature teeth.

The pressing portion (11) is not limited to a U-shaped cross section, and may have various shapes.

FIG. 7 is a block diagram showing the electrical configuration of the tubular valve of the present invention using a stepping motor.

A flow rate sensor for detecting the flow rate of fluid and a pressure sensor for detecting pressure are attached to the inflow side or the outflow side of the flexible tube (12). Below, a case where a flow rate sensor is used will be explained.

The detected value V by the flow rate sensor (51) and the setting circuit (
The reference value Vf set in 52) is compared in a comparison circuit (53).

The comparison result in the comparison circuit (53), that is, a normal rotation signal indicating that Vf<V or a reverse rotation signal indicating that Vf>V, is output to the controller (54). V
When f<V, that is, when the fluid flow rate exceeds the reference value, the controller (54) controls the rotation direction and pulses based on the normal rotation signal, and controls the rotation direction and pulses via the drive circuit (55). , rotates the motor (5B) in the normal direction. By normal rotation of the motor (56), the flexible tube (12) is pressed by the pressing portion (11) of the plunger σ), thereby reducing the degree of opening. On the other hand, if Vf>V, that is, if the fluid flow rate is less than the reference value, the controller (54)
is based on the reversal signal from the comparison circuit (53),
Drive circuit (55) that controls rotation direction and pulse
, the stepping motor (56) is rotated in the opposite direction to open the flexible tube (12) and increase the opening degree.

A tubular valve having such a control unit rotates the stepping motor (56) in the forward or reverse direction based on the comparison result of the comparison circuit (53), thereby controlling the fluid flowing through the flexible tube (12). Flow rate and pressure can be controlled.

FIG. 8 is a block diagram showing another electrical configuration of the tubular valve of the present invention.

In this control section, as described above, the detected value V by the flow rate sensor (51) and the reference value V set in the setting circuit (52) are used.
f is compared in a comparison circuit (58). Further, the comparison circuit (53) outputs a forward rotation signal or a reverse rotation signal to the controller (50) based on the comparison result.

Detection signal V by sensor (51) and setting circuit (52)
The reference value Vf set in is also input to the arithmetic circuit (57). This arithmetic circuit (57) calculates a control amount corresponding to Δ-Vf-V, and outputs the calculated control amount data to the controller (54). This controller (54
) outputs a drive signal to the drive circuit (55) based on the forward rotation signal or reverse rotation signal from the comparison circuit (53) and the control amount data from the calculation circuit (57), and drives the stepping motor ( 56).

This control circuit controls the controller (54) based on the magnitude of the control amount data calculated by the arithmetic circuit (57).
Since the pulse frequency can be varied, the rotation speed of the stepping motor (5B) can be controlled.

Therefore, the flow rate and pressure of the fluid flowing through the flexible tube (12) can be quickly controlled.

Note that when a pressure sensor is used instead of the flow rate sensor, if the comparison result in the comparison circuit (53) is Vf<V, that is, if the fluid pressure exceeds the reference value, the reverse rotation is performed. A signal is output to the controller (54) and V
When f>V, that is, when the fluid pressure is less than the reference value, a normal rotation signal is output to the controller (54).

Further, the flow rate and pressure control of the fluid may be performed by manually inputting the information to the controller based on the detected value by the sensor and the reference value displayed on the meter.

Preferred embodiments of the present invention are as follows.

(^) A tubular valve in which the valve body has an opening for attaching a flexible tube. In this case, the flow path system can be constructed simply and quickly without contaminating the flexible tube.

(B) Tubular valve whose valve body has a polygonal cross section. In this case, the valve body can be easily attached to the unit box, the degree of freedom in the attachment direction can be increased, and the flow path system can be constructed simply and quickly.

(C) A tubular valve in which the motor that can rotate forward and reverse is a stepping motor. In this case, it can rotate according to the number of pulses from the drive circuit, so the rotation angle resolution is high.
The amount of plunger movement can be controlled with greater precision.

(D) Tubular valve whose conversion mechanism is a screw.

In this case, the rotation by the forward/reverse motor can be converted into reciprocating motion with high precision, and the resolution of the plunger's mobility can be further improved.

(E) A tubular valve whose thread has a helix angle of 6" or less. In this case, the thread can be prevented from loosening due to the reaction force of the flexible tube, and the moving position of the plunger can be maintained.

(F) At least a detection means for detecting the flow rate or pressure of the fluid in the flexible tube, a comparison means for comparing the detection value detected by the detection means with a reference value, and a comparison result based on the comparison result by the comparison means. and a controller for driving the driving means. In this case, the flow rate and pressure of the fluid flowing through the flexible tube can be automatically and accurately controlled.

(G) a detection means for detecting the flow rate or pressure of the fluid in the flexible tube; a comparison means for comparing the detection value detected by the detection means with a reference value; a controller for driving the drive means based on the comparison result by the comparison means and the control amount by the calculation means; in this case, the Based on the control variable data, the controller can rapidly control the flow rate and pressure of fluid flowing through the flexible tube.

[Effects of the Invention] The tubular valve of the present invention has excellent sanitary properties as no fluid remains in the flow path system, and even if external force is applied, the tubular valve of the present invention does not open or close the flow path of the flow path system or the flow rate of the flow path. and pressure can be controlled accurately. Furthermore, the ventilation system can be constructed simply and quickly without contaminating the flexible tube.

In addition, if a spring member is interposed between the valve body and the flexible tube, even if the plunger is displaced by the magnetic poles of a magnet, or creep occurs in the flexible tube, the spring member will not displace the plunger. Since the flexible tubular body can be backed up and an appropriate squeezing force can be applied to the flexible tubular body, the flow rate and pressure of the flow path system can be accurately controlled.

Further, in the case where the plunger is formed in a hollow cylindrical shape, a vent hole is formed in the valve body, and a vent hole is formed in the cylindrical plunger, the impact force acting on the flexible tube body It can be used for a long time by preventing damage to the flexible tube.

Furthermore, when at least one of the vent hole formed in the valve body and the vent hole formed in the hollow cylindrical plunger is closed by a check valve, the flow direction of the fluid in the plunger can be regulated, so that the impact acting on the flexible tube body can be further alleviated.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing one embodiment of the tubular valve of the present invention, Fig. 2 is a side view of the main part of Fig. 1, and Fig. 3 is a longitudinal cross-sectional view showing another embodiment of the tubular valve of the present invention. Fig. 4 is a vertical cross-sectional view showing still another embodiment of the tubular lubricant of the present invention; Fig. 5 is a longitudinal cross-sectional view showing another embodiment of the tubular lubricant of the present invention; A schematic diagram for explaining the force acting on the threaded portion, FIG. 7 is a block diagram showing the electrical configuration of the tubular valve of the present invention, and FIG. 8 is a block diagram showing another electrical configuration of the tubular valve of the present invention. , Fig. 9 is a sectional view showing a conventional manual tube plano (lube). (1)... Drive motor, (2)... Rotating shaft, (3)
... Valve body, (4) ... Bearing, (5) ... Rotating body, (6) ... Screw, q) ... Plunger, (
8)...screw, (11)...pressing part, (12)...
・Flexible pipe body, (13)...opening, (15)...
Magnet, (17)...Disc spring, (21) (22
)...Vent hole, (41)...Check valve, (35) (4
5)... Rotating body, (51)... Sensor, (52)...
... Setting circuit, (53) ... Comparison circuit, (54) ...
・Controller, (55)...Drive circuit, (56)・
...Stepping motor, (57)...Arithmetic circuit patent applicant Shibaura Seisakusho Co., Ltd. Agent Patent attorney Hoe 1) Mitsuru Seiku Diagram Diagram Diagram 5 Diagram Diagram Shin U: Capital Diagram

Claims (1)

[Scope of Claims] 1. A valve body to which a flexible tube can be attached, a motor that is provided in the valve body and has a rotating shaft that extends inside the valve body and is reversible in the forward and backward directions, and the rotating shaft is connected to the rotating shaft. The valve has a rotating body attached thereto, a bearing rotatably supporting the rotating shaft or an attachment part of the rotating body on a valve body, and a plunger screwed onto the rotating body and whose rotation is regulated. A tubular valve, wherein a magnet is attached to at least one of the valve body and the rotating body. 2. The tubular valve according to claim 1, wherein a spring member is interposed between the valve body and the pressing portion of the plunger. 3. The plunger is formed in a hollow cylindrical shape, and the space between the valve body and the rotating body communicates with the outside through a vent hole formed in the valve body, and the space inside the cylindrical plunger The tubular valve according to claim 1, wherein the space communicates with the outside through a vent hole formed in the plunger. 4. The tubular valve according to claim 3, wherein at least one of the vent hole formed in the valve body and the vent hole formed in the cylindrical plunger is closed by a check valve.