JPH026952B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-way switching valve for a tank truck.

In tank trucks, the interior of the tank is usually divided into multiple tank chambers so that different types of liquids can be transported. The bottom valve of each tank chamber and the discharge valve communicating with the discharge hose are communicated by piping.

First, conventional technology will be described.

FIG. 1 is a diagram of a conventional piping configuration in a tank truck. That is, in the example shown in FIG. 1, the discharge valves 1, 2, and 3, which are disposed on both sides and the rear of the vehicle, are communicated with each other through pipes 4 and 5 for mutual communication, and are also connected to the bottom valves 6 and 7. .

The device shown in FIG. 1 discharges the liquid in the tank chamber by gravity (not via the transfer pump 13) or by a pump (via the transfer pump) by operating the four-way valve 12. Conversely, the liquid can be sucked and loaded into the tank chamber by the transfer pump 13. However, when loading a different type of liquid, such as gasoline or diesel oil, into the tank chamber and unloading it at a gas station, etc., the transfer pump 13
Since the use of liquids is regulated, unloading must be done by gravity, but since each tank chamber is connected, it is only possible to unload one type of liquid at a time, which increases unloading time and reduces work efficiency. Moreover, it is not desirable from a business point of view, as refueling and sales of fuel must be suspended during this period.

Therefore, in addition to the example shown in FIG. 1, piping configurations for tank trucks have also been developed that are highly efficient even when unloading by gravity.

In other words, in order to provide a tank truck equipped with a transfer pump that is highly efficient even when unloading by gravity,
If two different types of liquids or the same type of liquid are being used, but the tank is equipped with two receiving tanks or has two hose inlets, two hoses can be used to collect the liquid by gravity. Conventionally, devices have been developed that attempt to unload cargo and cut the unloading time in half. In other words, the inside of the tank is divided into a plurality of tank chambers, and a first pipe that communicates with an appropriate number of tank chambers via a bottom valve provided in each, and a bottom pipe provided in each of the remaining tank chambers. a second pipe communicating with the first pipe via a valve, and an inlet of a pump for transferring the first pipe and the second pipe by switching operation of a switching valve communicating with the first pipe and the second pipe; A device has been developed which is characterized in that the discharge port is alternately switched to communicate with the discharge port, and discharge valves that communicate with the discharge hose are provided in the first pipe and the second pipe, respectively.

FIG. 2 shows an example of a piping configuration diagram for a tank truck developed in this way.

That is, as shown in FIG. 2, the first piping 14 is
It communicates with the bottom valves 6, 7 and has discharge valves 15, 16, 17 extending to both sides and the rear of the vehicle.
The pipe 18 communicates with the bottom valves 8 and 9 and extends to both sides and the rear of the vehicle, and has discharge valves 19, 20, and 21. In other words, there are two discharge valves 15, 16, 17, 19, 2 on both sides and the rear of the vehicle.
0 and 21 are provided. and the first pipe 14
A transfer pump 13 is disposed via a four-way switching valve 26 provided in a communication pipe 25 between the first pipe 18 and the second pipe 18 . FIG. 3 is an overall view of a tank truck having such a configuration.

The above-mentioned four-way switching valve 26 will be explained with reference to FIG. That is, conventionally, such a four-way switching valve 26 has a first valve port (corresponding to C described below) that communicates with the first pipe 14 and a second valve port (corresponding to D described later) that communicates with the second pipe 18. , alternately to a third valve port (corresponding to A described later) communicating with the discharge port of the transfer pump 13 and a fourth valve port communicating to the suction port of the transfer pump 13 (corresponding to B described later). The method used was to switch and communicate. That is, in the first switching position, the first valve port and the third valve port, and the second valve port and the fourth valve port are communicated with each other, and then, in the second switching position (neutral position), the first valve port and the second valve port are communicated with each other. The valve port, the third valve port, and the fourth valve port are communicated with each other, and furthermore, in the third switching position, the first valve port and the fourth valve port, and the second valve port and the third valve port are communicated with each other.
A method in which the valve ports are connected to each other (open type)
I was getting more used to it. Now, since the first valve port and the second valve port communicate with each other at this second switching position (neutral position), the liquid on the first pipe 14 side and the liquid on the second pipe 18 side are simultaneously discharged. When unloading from the valve, the liquid on both piping sides may mix, and in order to avoid such a situation, it is necessary to further install a switching valve in the middle of the communication piping 25, so the piping structure is complicated. It will turn into a

A four-way switching valve (closed type) that closes the first valve port and the second valve port and communicates the third valve port and the fourth valve port in the second switching position (neutral position),
A grooved piston type is generally used for small four-way switching valves for hydraulic control, but when used in large-diameter piping for tank trucks, the four-way switching valve itself becomes large. It was not possible to put it into practical use.

Generally, for tank trucks, a rotary so-called Kotsuku type valve is used, which can be made smaller compared to the diameter of the piping, and the Kotsuku type is also used for the aforementioned four-way switching valve that communicates at the neutral position (open type). It is being Conventionally, it has been structurally difficult to make a Kotsuku type four-way switching valve closed type in the neutral position, and therefore, a four-way switching valve with a closed type in the neutral position has not been used for tank trucks.

The switching configurations of the open type four-way switching valve and the closed type four-way switching valve are as shown in the explanatory diagram of FIG.

This point was pointed out in the conventional example.

Therefore, if such a closed type four-way switching valve is provided, the first piping 14 and the second piping 18 can be mutually independent in the case of FIG. It is possible to simultaneously unload the liquid in the tank chamber communicating with the second pipe 18 and the liquid in the tank chamber communicating with the second pipe 18 by gravity, which is preferable. The present invention has been made in view of the above circumstances.

First, the technical means of the present invention are as follows.

This four-way switching valve has a cylindrical valve chamber with a horizontal axis, a first valve port that opens opposite to the circumferential side, a second valve port, and a third valve that opens at the bottom of the circumference. A valve body is rotatably fitted into the valve chamber, and has a communication hole that communicates one opening with a fourth valve port provided at the cylindrical bottom of the valve chamber. Further, by the rotational movement of the valve body, the other opening of the communication hole is provided with an opening that communicates with the first valve port, the second valve port, and the third valve port, and is used for a tank truck. Ru.

The inside of the tank of the tank truck is divided into a plurality of tank chambers, and a first pipe is connected to an appropriate number of tank chambers through a bottom valve provided in each tank chamber, and each tank chamber is connected to a first pipe that communicates with a different type of liquid. A second pipe is provided that communicates with the remaining tank chambers that can be loaded through bottom valves provided therein, and
Further, a discharge valve is arranged in each of the first pipe and the second pipe.

In this four-way switching valve, the first valve port communicates with the first pipe, the second valve port communicates with the second pipe, and the third valve port communicates with the discharge pump of the transfer pump. The fourth valve port communicates with the inlet of the transfer pump. A partitioning body that partitions the valve chamber in the cylindrical direction is integrally provided on the valve body at the position of the spine of the valve body, and the center positions of the first valve port and the second valve port are set in the valve body. It is provided at a position below the rotation center position.

The Kotsuk type four-way switching valve for a tank truck according to the present invention is comprised of such means and operates as follows.

In other words, this Kotuku-type four-way switching valve is a closed type in the neutral position, and when unloading by gravity in the neutral position, the first valve port and the second valve port are closed and partitioned by the partition body. The first pipe and the second pipe are mutually independent. Therefore, if the liquid in the tank chamber communicating with the first pipe and the liquid in the tank chamber communicating with the second pipe are different types of liquids, they are unloaded simultaneously by gravity without mixing with each other.

A four-way switching valve of this type, which is closed in the neutral position, can be obtained by slightly modifying an existing open-type four-way switching valve. In other words, this four-way switching valve is obtained by providing a partition at the back of the valve body and providing the first valve port and the second valve port at predetermined lower positions, so that the piping structure is not complicated and the four-way switching valve is It does not itself become large.

Hereinafter, details of the present invention will be explained based on drawings of embodiments.

That is, first, in the developed perspective view of the four-way switching valve according to the present invention shown in FIG. They are a first valve port and a second valve port that open opposite to the portion. Further, A is a third valve opening opening at the bottom of the circumference, and B is a fourth valve opening opening at the bottom of the cylinder. 27 is a valve body having a communication hole opening in two orthogonal directions, and the valve body 27 is rotatably fitted into the valve chamber 31, and one opening 27a is always aligned and connected to the fourth valve port. The other opening 27b is in contact with the inner circumferential surface of the valve chamber 31 and is switched to coincide with and connect to the first valve port C, second valve port D, and third valve port A by sliding. In other words, the valve body 27 is configured to switch the other opening 27b of its communication hole to communicate with the first valve port C, the second valve port D, and the third valve port A by rotating the valve body 27.

In the figure, 29 is a mounting member for the valve body 27, and 30 is a mounting member for the valve body 27.
is a relief member. Furthermore, each of the above configurations is exactly the same as the conventional open type.

Next, the piping structure of a tank truck provided with such a four-way switching valve is the same as that described above with reference to FIGS. 2 and 3. In other words, the inside of the tank of a tank truck is divided into a plurality of tank chambers, and each tank chamber has an appropriate number of
A first pipe 14 communicates with each other via bottom valves 6 and 7 provided in each of the tank chambers, and bottom valves 8 and 7 provided in each of the remaining tank chambers into which liquids of different types can be loaded. A second pipe 18 communicating through 9
The first pipe 14 and the second pipe 18 are provided with discharge valves 15, 16, 17 and discharge valves 19, 20, 21, respectively.

The first valve port C of the four-way switching valve is communicated with the first pipe 14 via the communication pipe 25 on the left side of the figure, and the second valve port D is communicated with the second pipe 14 via the communication pipe 25 on the right side of the figure.
The third valve port A communicates with the discharge port of the transfer pump 13, and the fourth valve port B communicates with the suction port of the transfer pump 13.

In the present invention, such a four-way switching valve is made into a closed type by slight processing. In other words, a plate-shaped partition 28 that partitions the valve chamber 31 in the cylindrical direction is newly integrally provided at the back muscle position of the valve body 27, and the center positions of the first valve port C and the second valve port D are open. It is provided at a position lower than the position in the case of the mold, that is, at a position lower than the rotation center position of the valve body 27. This is illustrated in detail in a vertical sectional view as shown in FIG. That is, when the four-way switching valve is in the neutral position, that is, during gravity unloading, the partition 28 as shown in the figure allows the first valve port C and the second valve port D, which were in communication with each other in the existing open type four-way switching valve, to partitioned and cut off.

The above is the explanation of the configuration of the four-way switching valve for a tank truck according to the present invention.

The operation etc. will be explained below.

FIG. 7 is a diagram showing the switching mode of this closed type four-way switching valve.

First, in the diagram A showing the neutral position in the switching mode diagram of Fig. 7, the first valve port C and the second valve port D are closed, and only the third valve port A and the fourth valve port B are in communication. (See also Figure 6).

To explain this point in detail with illustrations, this Kotsuku-type four-way switching valve is a closed type (closed type) at the neutral position, and when unloading by gravity at the neutral position, there is a gap between the first valve port C and the second valve port D. The first pipe 14 and the second pipe 18 are closed and partitioned off by a partition body 28, and the first pipe 14 and the second pipe 18 are independent from each other. Therefore, the first
Liquid in the tank chamber communicating with the pipe 14 and the second pipe 18
If the liquid in the tank chamber communicating with the tank is different, the liquid will not mix with each other and will be unloaded simultaneously by gravity. In other words, the liquid on the first piping 14 side from the bottom valves 6 and 7 and the liquid on the second piping 18 side from the bottom valves 8 and 9 are simultaneously discharged from either of the respective discharge valves 15, 16, 17 and the discharge valve 19. , 20, 21, the cargo is unloaded by gravity. At that time, since the space between the first valve port C and the second valve port D is closed by the partition 28, the liquid unloaded from the first pipe 14 side and the liquid unloaded from the second pipe 18 side. There is no such thing as mixing.

Next, in FIG. 7, the switching modes shown in Figures B and C are exactly the same as in the case of the existing open type.

To briefly explain this point with illustrations, the switching modes shown in FIG. 7 are shown for pump unloading or pump suction loading using the transfer pump 13. And in the case of diagram B,
The third valve port A and the first valve port C, and the second valve port D and the fourth valve port B are communicated with each other, and the liquid is transferred from the second valve port D side to the first valve port C side by the transfer pump 13. and head towards it. In the case of Figure C, the third valve port A and the second valve port D, and the first valve port C and the fourth valve port B are communicated with each other, and the liquid is transferred to the first valve port C by the transfer pump 13.
side toward the second valve port D side.

Next, in the case of the conventional open type, the first
Normally, the valve port C and the second valve port D face each other on the center line of the valve seat circle, but in this closed type, because a partition 28 is attached as shown in the figure, this is the first valve port C or the second valve port D. The first valve port C and the second valve port D are provided at a slightly lower position so that they do not protrude. As a result, the flow path between the third valve port A and the second valve port D is narrowed so that the flow of the liquid is not obstructed, and conversely, when the opening 27b communicates with the second valve port D, the third valve port A The flow of liquid between the valve port C and the first valve port C is not obstructed.

A four-way switching valve of this type, which is closed in the neutral position, can be obtained by slightly modifying an existing open-type four-way switching valve. That is, this four-way switching valve is obtained by providing the partition body 28 at the position of the back of the valve body 27, and by providing the first valve port C and the second valve port D at predetermined lower positions, and separately connects the communication pipe 2.
5 (see Figure 2), the piping structure does not become complicated, and the four-way switching valve itself becomes larger as in the case of using a conventional grooved piston type. Nor.

The above is the explanation based on the embodiment.

The four-way switching valve for a tank truck according to the present invention is a four-way switching valve for a tank truck that is of the desired type and is closed in the neutral position, by making slight modifications to the existing open-type switching valve. This is what we can provide. Firstly, the first piping side and the second piping side are independent, which prevents different types of liquids from mixing and enables simultaneous unloading by gravity, which saves time and improves work efficiency. improves. Moreover, secondly, this can be achieved by a simple configuration such as providing a partition without becoming complicated or large.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are piping configuration diagrams in a tank truck. Figure 1 shows the conventional example.
FIG. 2 shows the four-way switching valve according to the present invention to which it is applied. FIG. 3 is an overall view of the tank truck shown in FIG. 2. FIG. 4 is an explanatory diagram of the switching form of the switching valve. FIG. 5 is an exploded perspective view of the four-way switching valve according to the present invention. Figure 6a in Figure 6 is a longitudinal cross-sectional view of this four-way switching valve, and figure b is a cross-sectional view taken along line A--A in figure a. Figure 7 shows the switching mode of this four-way switching valve. Figure A shows the neutral position where gravity unloading is performed, and Figures B and C show the position where pump unloading, pump suction loading, etc. are performed. Each switching position is shown. 13... Transfer pump, 14... First piping, 1
8...Second piping, 31...Valve chamber, C...First valve port, D...Second valve port, A...Third valve port, B...Fourth valve port, 27...Valve body , 28... Partition body.

Claims (1)

[Claims] 1. A first valve port, a second valve port, and a third valve port, which open toward the circumferential side of a cylindrical valve chamber with a horizontal axis, and a third valve port, which opens toward the bottom of the circumference. A valve body is rotatably fitted into the valve chamber, and the valve body is rotatably fitted into the valve chamber, and has a communication hole that communicates one opening with a fourth valve port provided at the cylindrical bottom of the valve chamber. A four-way switching valve for a tank truck, which is provided with an opening that communicates with the first valve port, the second valve port, and the third valve port by switching the other opening of the communication hole to the first valve port, the second valve port, and the third valve port by rotational movement, The inside of the tank is divided into a plurality of tank chambers, and an appropriate number of each tank chamber is connected to a first pipe that communicates with each other through a bottom valve provided in each tank chamber, and a liquid of a different type can be loaded into each tank chamber. A second pipe is provided which communicates with the remaining tank chamber through a bottom valve provided in each of the tank chambers,
and a discharge valve is arranged in each of the first pipe and the second pipe, the first valve port communicates with the first pipe, and the second valve port communicates with the second pipe, Further, the third valve port communicates with the discharge port of the transfer pump, and the third valve port communicates with the discharge port of the transfer pump.
The valve port communicates with the suction port of the transfer pump, and a partition body is provided integrally with the valve body to partition the valve chamber in the cylindrical direction at a position on the back of the valve body,
A four-way switching valve for a tank truck, characterized in that the center positions of the first valve port and the second valve port are located below the center of rotation of the valve body.