JP2729208B2 - Ball valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve for sampling a predetermined amount of fluid for performing a periodic inspection.

[0002]

2. Description of the Related Art In a piping system for flowing wastewater or wastewater,
2. Description of the Related Art A certain amount of fluid is periodically sampled and analyzed and inspected for abnormalities. FIG. 8 shows a conventional sampling device. A T-shaped pipe 104 is provided in a part of the sewage pipe system, and an upstream cock valve 101 is provided in a T-shaped upstream pipe 106, a downstream cock valve 102 is provided in a downstream pipe 107, and a sampling cock valve 108 is provided in a sampling pipe 105. . Each cock valve is an on-off valve having a structure that is fully closed by rotating the handle 90 degrees.

Next, a procedure for sampling a certain amount of sewage by the apparatus shown in FIG. 8 will be described. Normally, the sampling cock valve 103 is fully closed, the upstream cock valve 101 and the downstream cock valve 102 are fully opened, and the wastewater is
6 to the downstream pipe 107. First, after the fluid is shut off by the downstream cock valve 102 and then the upstream cock valve 101 is shut off, the sampling cock valve 103 having the opening 108 at the other end is opened, and the upstream cock valve 101 of the T-shaped piping 104 is opened. The sewage stored in the piping of the downstream cock valve 102 and the sampling cock valve 103 was collected from the opening 108.

[0004]

However, the conventional sampling device has the following problems. (1) In the conventional sampling device, the sampling tube 1
05, there is a limit to shorten the sampling cock valve 108 and the upstream cock valve 101 and the downstream cock valve 1 are closed.
02 and open the sewage in a normal state,
Sewage remains in the sampling pipe 105. On the other hand, when the sewage or the like stays, the organic matter changes due to bacteria and the like contained in the sewage, so sampling the stagnant sewage has a problem that the inspection data is different from the sewage actually flowing. . For this reason, conventionally, after opening the sampling cock valve 108, the wastewater for sampling has been collected by discarding the wastewater a little and then collecting the wastewater for sampling. There was no guarantee.

(2) Further, the sewage inspection is performed after a certain amount is accurately measured with a measuring cylinder or the like, but the amount of sewage to be sampled is desirably slightly larger than the certain amount and almost constant. . However, in the conventional method, the amount of wastewater sampled is too large, the amount of remaining wastewater is large, and there is a problem that extra time is required for treatment and the like. Here, the reason why the amount of sewage to be sampled is large is that if the amount of sewage is small, it is necessary to perform sampling again.

(3) Regular sampling of sewage requires manual operation, and it is not easy to secure manual operation because the sewage is smelly and dirty. Therefore, automation of sampling is desired, but if a solenoid valve is provided instead of a cock,
Since three solenoid valves are used, there is a problem that the cost is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a ball valve for sampling capable of solving the above-mentioned problems relating to the prior art and washing out the sewage accumulated in the valve to collect only a certain amount of fresh sewage. .

[0008]

In order to achieve the above object, a ball valve according to the present invention is provided with a communication hole penetrating the center and rotates the input port and the output port so that the input port communicates with the output port. A ball valve having a ball valve body for passing a liquid to a port, wherein a center line between an input port and an output port coincides, and an air vent port and a sample collection port provided at a center line substantially perpendicular to the center line. After the state in which the liquid is flowing from the input port to the output port, the ball valve body is rotated to communicate the air vent port and the sampling port with the communication hole, and is stored in the communication hole. The liquid is discharged from the sampling port.

In the above-mentioned ball valve, the ball valve element may be (1) a fully open state in which the input port communicates with the output port, and (2) a sample collecting state in which the air vent port communicates with the sample collecting port. And (3) a fixed position between the fully opened state and the sample collection state, in which the flow of the liquid is in a communicating state and a washing state in which the liquid remaining in the valve is washed out, and the ball valve body is disposed. It is characterized by having a motor to rotate, and motor control means for stopping the ball valve for a predetermined time in the washing state while rotating the ball valve from the fully open state to the sample collection state. In the above-mentioned ball valve, in order to store a predetermined amount of the liquid in the communication hole, the inside diameter of the communication hole is made larger than the diameter of the entrance. In the above-mentioned ball valve, an opening area of the sample collection port is larger than an opening area of the air vent port.

[0010]

The ball valve body rotatably supported by the ball valve of the present invention having the above-described structure is provided with a communication hole penetrating the center, and rotates to connect the input port and the output port. Pass the liquid through the output port. In addition, the ball valve element is rotated by approximately 90 degrees, so that an air vent port provided on a center line substantially perpendicular to the center line between the input port and the output port communicates with the sample collection port. In order to periodically sample a predetermined amount of liquid such as sewage flowing from the input port to the output port, after the liquid is flowing from the input port to the output port, the ball valve is rotated and the communication hole is rotated. Thereby, the air release port and the sample collection port are communicated with each other, and the liquid stored in the communication hole is caused to flow out of the sample collection port. Here, since the internal diameter of the communication hole is larger than the diameter of the entrance, the internal diameter may be designed to store an arbitrary predetermined amount of the liquid. This makes it possible to easily sample an arbitrary fixed amount of liquid.

In addition, since there is almost no stagnation point,
It is possible to sample fresh sewage and the like. Further, the ball valve element has (1) a fully open state in which the input port communicates with the output port, and (2) a sample collecting state in which the air vent port communicates with the sample collecting port.
(3) It is located at an intermediate position between the fully opened state and the sample collection state, and has a fixed position where the flow of the liquid is in a washing state in which the liquid remaining in the communication hole and the valve is washed away. Then, the motor control means stops the ball valve element for a predetermined time in the cleaning state while rotating the ball valve element from the fully opened state to the sample collection state during the rotation of the motor for rotating the ball valve element. Since the sewage and the like staying in the gaps are also washed away in the washing state, the sewage and the like to be sampled can be always fresh. Here, since the opening area of the sampling port is larger than the opening area of the air vent port, when sampling, the air is less likely to be trapped when the sewage or the like falls, and the sewage or the like can be quickly dropped.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the ball valve of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the overall configuration of the ball valve according to the present embodiment. The ball valve is roughly divided into a lower valve portion and an upper valve drive portion. First, the configuration of the valve unit will be described. FIG. 2 shows an AA cross section of the valve section. At the center of the valve portion, a spherical ball valve body 11 is provided with a valve seat 17 made of tetrafluoroethylene resin.
18, the air release sheet 35, and the sampling sheet 34 are rotatably held. Ball valve element 11
, A communication hole 12 is formed penetrating the center. The communicating hole 12 has an opening at both ends having a diameter of N, a central portion having a diameter of M, and M being formed to be larger than N, and a central portion having a larger sectional area than an end portion. A rotation hole 14 is formed directly below the ball valve body 11 and is rotatably fitted to a rotation shaft 37 fixed to the valve body 19. A key groove 13 is formed directly above the ball valve body 11, and a key portion at the lower end of the rotation transmission shaft 20 is fitted.

An input port 15 is open on the left side of the valve body 19. On the right side of the valve body 19, an output port 16 is opened coaxially with the center line of the input port 15. In addition, as shown in FIG.
The air vent port 33 and the sampling port 34 are formed on a center line that is perpendicular to the center line of the ball valve 6 and passes through the center of the ball valve body 11. Here, the diameter of the sampling seat hole 36a formed in the sampling sheet 36 supporting the ball valve body 11 at the sample collection port 34 is equal to the diameter of the air release sheet supporting the ball valve body 11 at the air release port 33. Air bleed sheet hole 3 drilled in 35
The diameter is larger than 5a.

FIGS. 1 and 2 show that the center line of the communication hole 12 is in line with the center line of the input port 15 and the output port 16, the input port 15 and the output port 16 are completely connected, and air is vented. Port 33 and sampling port 3
4 indicates a fully opened state in which the shutter is completely shut off. The valve sheets 17, 18, the air release sheet 35, and the sampling sheet 36 are fixed to the valve body 19. The reason why the valve seats 17 and 18, the air release sheet 35, and the sampling sheet 36 are separate bodies is that the rotational sliding resistance of the ball valve body 11 does not increase, so that the seat and the ball valve body 11 are separated.
This is to reduce the contact area with the contact.

Next, the rotation drive unit will be described. The output shaft of the motor 24 transmits power via a series of reduction gears 23 to a final gear 22 fixed to the output shaft 21. At the upper end of the output shaft, three timing cams 25,
26 and 27 are attached. Timing cam 2
At the corresponding positions of 5, 26, 27, a full-open switch 28 for detecting the fully open position of the ball valve body 11 and a cleaning switch 2 for detecting the cleaning state are provided.
9, and a sampling switch 30 for detecting the sampling state. These rotation drive units are covered by a case 31. The output shaft 21 is connected to the rotation transmission shaft 20 by a shaft coupling 32.

Next, a control circuit for controlling the motor 24 for rotating the ball valve element 11 is shown in FIG. The motor 24 is connected to a full-open switch 28, a cleaning switch 29, and a sample collection switch 30. Fully open switch 2
8 detects that the ball valve element 11 is at the fully open position shown in FIG. In the fully open state, the input port 15 and the output port 16 are completely connected, and the air vent port 33
And the sampling port 34 are completely shut off.
Further, the cleaning switch 29 detects that the ball valve body 11 is at the cleaning state position shown in FIG. Here, the ball valve element 11 in FIG. 3 is at a position rotated clockwise by 30 degrees from the fully open state shown in FIG. In the cleaning state, the communication hole 12 is located exactly at the corner of the valve seats 17 and 18, the input port 15 and the output port 16 communicate with each other by about half, and the communication hole 12 also communicates with the gap A of the valve body 19. doing.

The sampling switch 30 detects that the ball valve body 11 is in the sampling state shown in FIG. In the sample collection state, the input port 15 and the output port 16 are completely shut off, and the air vent port 33 and the sample collection port 34 are completely connected. The switches SW1 and SW2 are relay switches that operate upon receiving a signal for controlling the motor 24 from a central control device (not shown). The operation will be described later.

Next, the operation of the ball valve having the above configuration will be described. Normally, the ball valve element 11 is in the fully open state shown in FIG. 2, and the switches SW1 and SW2 are both connected to NO. Then, the fully open switch 28 is set to 28
b. Thereby, the fully open lamp L1 indicating the fully open state is lit. In this state, the ball valve 1
There is a possibility that the sewage stays in the gap A in 1 and bacteria are proliferating.

Next, a method of periodically sampling wastewater will be described. In the water quality inspection apparatus of this embodiment, sewage is sampled every hour. When the switch SW1 is switched to NC, the motor 24 rotates clockwise.
Then, when the ball valve element 11 comes to the cleaning state position shown in FIG. 3, the cleaning switch 29 is switched from 29b to 29a. As a result, the motor 24 stops. At this time,
Both the fully open lamp L1 and the sampling lamp L2 are off. The motor 24 stops in this cleaning state for 10 seconds. In the cleaning state, as shown in FIG. 3, the sewage flowing from the input port 15 flushes the sewage retained in the gap A to the output port 16 through the communication hole 12. After 10 seconds, the retained sewage is eliminated, and all the sewage flowing through the communication hole 12 becomes fresh.

Next, when the cleaning state for 10 seconds is completed,
The switch SW1 and the switch SW2 are both connected to the NC, and the motor 24 rotates clockwise. Then, when the ball valve body 11 reaches the sample collecting state position shown in FIG. 6 through the state of FIG. 4 and the state of FIG. 5, the sample collecting switch 30 is switched from 30b to 30a. As a result, the motor 24 stops, and the sampling lamp L2 is turned on. The circuit diagram of FIG. 7 shows a circuit state in a sample collection state. In the state of FIG.
, A predetermined amount of fresh sewage is stored. In this embodiment, a volume of 6 cc is secured by making the inner diameter M of the communication hole 12 larger than the opening diameter N.

When the ball valve element 11 is brought into the sample collecting state, the sewage stored in the communication hole 12 falls from the sample collecting port 34 and 6 cc of sewage is collected in a sample container (not shown). When the sewage falls, the communication hole 12 is smoothly tapered toward the opening end, so that the sewage easily falls by its own weight. In the sample collection state, when the sewage stored in the communication hole 12 falls, the ball valve 1
The diameter of the sampling seat hole 36a formed in the sampling seat 36 supporting the air valve 1 is adjusted by the air release port 33 to support the ball valve body 11 with the air release sheet 3.
5 is larger than the diameter of the air release sheet hole 35a drilled in 5, so that when the sewage falls, there is little air entrapment, and the sewage that can quickly drop the sewage does not foam, It is convenient when measuring sewage.

After a lapse of a predetermined time during which the sewage falls, the switches SW1 and SW2 are both switched to NO, and the motor 24 rotates counterclockwise. Then, when the ball valve element 11 reaches the fully open position shown in FIG. 2, the fully open switch 28 switches from 28b to 28a. As a result, the motor 24 stops, and the fully open lamp L1 is turned on. Thereby, the flow of sewage returns to a normal state.

As described in detail above, according to the ball valve of the present embodiment, the air vent port 33 and the sample collection port provided on the center line perpendicular to the center line of the input port 15 and the output port 16 are provided. 34 and the input port 15
After the sewage is flowing from to the output port 16, the ball valve element 11 is rotated to allow the communication port 12 to communicate the air vent port 33 and the sampling port 34, and is stored in the communication hole 12. Sewage sampling port 3
4, the fresh sewage can be easily collected.

Further, according to the ball valve of the present embodiment, the ball valve element 11 has (1) the input port 15 and the output port 1
6 and (2) air release port 3
(3) The flow of sewage from the input port 15 stays in the gap A in the valve at an intermediate position between the sampling state in which the sampling port 3 communicates with the sampling port 34 and (3) the fully opened state and the sampling state. A motor 24 having a fixed position for washing the waste water and rotating the ball valve body 11
While the ball valve 11 is being rotated from the fully open state to the sample collection state, the ball valve 1
Since 1 is stopped, sewage that has accumulated in the gap A in the valve can be washed away, and fresh sewage can be collected.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the scope of the present invention. For example, in the ball valve of the present embodiment, the ball valve body 11 is not stopped at the position of FIG. 4 or FIG. 5, but by adding a microswitch, the ball valve body 11 is moved to the position of FIG. When stopped, the input port 15 and the output port 16 can be shut off, and the air shutoff port 33 and the sample collection port 34 can be shut off in a fully shut off state. In the present embodiment, the air vent port 33 is open to the atmosphere. However, the wastewater to be sampled may be forcibly discharged by flowing compressed air from the air vent port 33. This makes it possible to reliably perform sampling in a short time.

[0026]

As described above, according to the ball valve of the present invention, the ball valve has the air vent port and the sample collection port provided on the center line perpendicular to the center line between the input port and the output port. After the sewage is flowing from the input port to the output port, the ball valve is rotated to connect the air vent port and the sampling port with the communication hole, and the sewage stored in the communication hole is sampled. Since the water is discharged from the port, a predetermined amount of fresh sewage can be easily collected.

Further, according to the ball valve of the present invention, the ball valve element has (1) a fully open state in which the input port communicates with the output port, and (2) a sample in which the air vent port communicates with the sample collection port. A fixed state of a collecting state and (3) a cleaning state in which the flow of sewage from the input port is at an intermediate position between the fully opened state and the sample collecting state to wash out the liquid remaining in the valve; The motor that rotates the ball valve element, while rotating the ball valve element from the fully open state to the sample collection state, the ball valve element has been stopped for a predetermined time in the cleaning state, so that the sewage remaining in the valve is removed. It can be washed away and fresh sewage can be collected without human intervention.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the overall configuration of a ball valve of the present invention.

FIG. 2 is a cross-sectional view showing a fully opened state of a valve portion of the ball valve.

FIG. 3 is a sectional view showing a cleaning state of a valve portion of the ball valve.

FIG. 4 is a cross-sectional view illustrating a first intermediate state in which the valve portion of the ball valve shifts from a cleaning state to a sample collection state.

FIG. 5 is a cross-sectional view showing a second intermediate state in which the valve portion of the ball valve shifts from a cleaning state to a sample collection state.

FIG. 6 is a cross-sectional view showing a sampling state of a valve portion of a ball valve.

FIG. 7 is a control circuit diagram of a ball valve.

FIG. 8 is a cross-sectional view showing a configuration of a conventional sample collecting device.

[Explanation of symbols]

 11 Ball valve body 12 Communication hole 15 Input port 16 Output port 17, 18 Valve seat 24 Motor 28 Fully open switch 29 Wash switch 30 Fully close switch 33 Air release port 34 Sample collection port 35 Air release sheet 36 Sampling sheet A Gap

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-38773 (JP, A) JP-A-51-16235 (JP, U) JP-A-63-1228 (JP, Y2)

Claims (4)

(57) [Claims] 1. A ball valve having a ball valve body having a communication hole penetrating a center thereof, rotating the input port to communicate with an output port, and allowing a liquid to flow from the input port to the output port. The center line with the output port coincides,
An air vent port and the sampling port provided at the center line and forming a center line substantially perpendicular, the input port and the output port of the ball valve body
A pair of valve systems fixed to the periphery and holding the ball valve body
To the air vent port inside the ball valve body.
And an air release valve seat for holding the ball valve body, and fixed around the sampling port in the ball valve body.
And a sampling valve seat for holding the ball valve element
Having a state in which the liquid is flowing from the input port to the output port, after rotating the ball valve body, the communication hole allows the air vent port and the sample collection port to communicate with each other, A ball valve for discharging the liquid stored in a communication hole from the sample collection port. 2. A rotating device having a communication hole penetrating the center.
By connecting the input port to the output port,
Has a ball valve that passes liquid from the port to the output port
In the ball valve, the center lines of the input port and the output port match,
Air vent provided on a center line that is approximately perpendicular to the center line
A sample valve having a port and a sample collection port, wherein the ball valve element is: (1) a fully open state in which the input port communicates with the output port; and (2) a sample in which the air vent port communicates with the sample collection port. Each of the fixed positions includes a collection state and (3) a cleaning state in which the liquid flow is at an intermediate position between the fully open state and the sample collection state and in which the liquid flows to wash away the liquid remaining in the communication hole and the valve. A motor for rotating the ball valve element, and a motor control means for stopping the ball valve element for a predetermined time in the cleaning state during the rotation of the ball valve element from the fully open state to the sample collection state. A ball valve, characterized in that: 3. The ball valve according to claim 1, wherein an internal diameter of the communication hole is larger than a diameter of an inlet / outlet so as to store a predetermined amount of the liquid in the communication hole. Ball valve to do. 4. In any one of the ball valve according to claim 1 to claim 3, a ball valve, wherein the opening area of the sample collection port is greater than the opening area of the air vent port.