JPS6258986B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bottom valve in a tank truck.

(Prior Art) Conventionally, the bottom valve of a tank truck has an opening provided at the bottom of the tank body that is opened and closed by a valve body, and the valve body is screwed onto a support provided above the opening. It is held by a handle and connected via a rod to a handle provided on the upper part of the tank body, and is rotated and moved up and down by operating the handle so that it is seated on the valve seat.

(Problems to be Solved by the Invention) However, in the above-mentioned bottom valve, the valve body, the support body, and the valve seat are installed separately, so it is difficult to align the valve body and the valve seat, and to adjust the alignment between the valve body and the support body. The alignment was extremely complicated, and the installation work was complicated.

In addition, since the valve body and support body are provided above the opening, it is necessary to enter the tank body for installation work and maintenance inspection each time, which is extremely troublesome. There was a problem that residual liquid formed around the periphery of the seat, causing chemical changes when a different type of liquid was stored.

(Means and Effects for Solving the Problems) In view of the above, the present invention includes a plurality of openings provided at the bottom of the tank body, and a valve unit located below the openings via a support. The support body includes a gutter member that protrudes downward from the bottom of the tank body and is located outside the opening, and a valve unit support member that is connected to the gutter member. consists of a casing fitted into the valve unit support member, a valve body provided so as to be seated on the upper end of the casing, and a movable valve built in the casing and connected to the valve body to open and close the valve body. The purpose of the present invention is to provide a bottom valve for a tank lorry that allows installation work and maintenance and inspection to be easily performed from below the tank, and prevents residual liquid from forming.

(Example) Hereinafter, the configuration of the present invention will be described with reference to the drawings.

<First Embodiment> As shown in FIGS. 1 to 3, 1 is a tank of a tank lorry, which is mounted on a vehicle chassis, and the inside of a tank body 2 is divided into five storage chambers 3. , each chamber 3 is provided with a bottom valve 4.

The bottom valve 4 has a valve unit 7 connected to an opening 5 formed at the bottom of the tank body 2 via a support 6, and a ring member 8 is fixed to the opening 5. Further, a downwardly extending flange 2a is bent and formed on the tank body 2 at the periphery of the opening 5, while a ring member 8 has a flange 8 on the upper edge of the outer periphery that projects slightly outward.
a is formed and inserted into the opening 5 from above, and the collar portion 8a engages with and is supported by the flange 2a.
Also, between the tank body 2 and the flange 8a, there is a weld overlay 9.
The upper surfaces of the tank body 2 and the ring member 8 are formed substantially flat.

The support body 6 is composed of a gutter member 10 that protrudes downward from the bottom of the tank body 2 and is fixed in the front-rear direction, and a valve unit support member 11 that is connected to the gutter member 10. The gutter member 10 is located outside the opening 5, has a substantially W-shaped cross section, has a lower surface inclined downward toward a substantially central portion in the front-rear direction, and has a discharge pipe 12 connected to the lowest central portion. . The valve unit support member 11 has a flange portion 11b at the lower end of the cylindrical portion 11a.
The cylindrical portion 11a is fitted and fixed at a position below the opening 5 in the gutter member 10.

The valve unit 7 includes a casing 13, a valve body 14, and a movable portion 15 of the valve body 14, and is connected below the opening 5. The casing 13 has a cylindrical portion 13a
A flange portion 13b is connected to the lower end of the valve unit support member 11 and the ring member 8. A communication hole 13c is formed in the upper half of the cylindrical portion 13a to communicate between the inside and outside, and a valve seat 13d is formed at the inner peripheral edge of the upper end by cutting downward inwardly.
The communication hole 13c is open within the gutter member 10. Further, a lid body 16 is detachably fixed to the lower part of the casing 13 by bolts and nuts (not shown) passing through the valve unit support member 11 and each flange portion 11b, 13b of the casing 13. The valve body 14 is made of synthetic resin 14 on the lower surface of the disc-shaped main body 14a.
b is attached to the valve seat 13d, and opens and closes the discharge port 17 on the upper surface of the cylindrical portion 13a, and has an outer diameter that is the same as or slightly smaller than the outer diameter of the cylindrical portion 13a.

The movable part 15 is built into the casing 13 and moves the valve body 14 up and down using air pressure.
A piston 18 fitted to the cylindrical portion 13a so as to be vertically slidable, a rod 19 connecting the valve body 14 and the piston 18, a fluid chamber 20 defined by the piston 18, the cylindrical portion 13a, and the lid 16, and a valve. It is composed of a compression spring 21 that urges the body 14 downward in the direction of closing the discharge port. The piston 18 is shaped like an inverted bowl, while the rod 19 extends into the fluid chamber 20. Further, the fluid chamber 20 is provided with a holding member 22 for the compression spring 21, and the holding member 22 is made up of an inner flange part 22b and an outer flange part 22c connected to the upper and lower ends of the cylindrical part 22a, and the outer flange part 22c. is fixed by the casing 13 and the lid 16. The compression spring 21 is interposed between the inner flange portion 22b and the support piece 23 at the lower end of the rod 19.

Note that 24 is an air port that is bored in the lid 16 and opens into the fluid chamber 20, and 25 is a strainer that is fixed to the ring member 8.

FIG. 4 shows the air control circuit 26 of the bottom valve 4, in which a control passage 29 in which an air pressure source 27 and an emergency valve 28 are connected in series is branched into five branch passages 30, and each branch passage 30 has two branch passages. After connecting the bottom valve operating valves 31 in parallel, the bottom valve 4 is connected via the shuttle valve 32.
while the control passage 29 between the pneumatic pressure source 27 and the emergency valve 28 and the emergency valve 28 are connected to the air port 24 of the
Remote control valve 3 between the operating section of
The remote control valve 33 operates the emergency valve 28 and is provided at a suitable location such as in the driver's cab.

Next, the operation of the bottom valve 4 will be explained. As shown in FIG. 3, when the operating valve 31 is opened from the closed state of the valve body 14, compressed air is supplied to the fluid chamber 20 and the piston 18 moves upward against the spring force of the compression spring 21. , the valve body 14 via the rod 19
moves upward, the discharge port 17 is opened, and the liquid in the storage chamber 3 is discharged from the discharge port 17, the communication hole 13c, and the gutter member 1.
0 and is discharged to the outside through the discharge pipe 12.

When closing the valve body 14, when the operation valve 31 is shut off, the compressed air in the fluid chamber 20 is released from the operation valve 31 to the atmosphere, and the valve body 14 is moved downward by the spring force of the compression spring 21. Then, the discharge port 17 is closed.

In addition, at the time of emergency discharge stop, the remote control valve 33 is operated to shut off the emergency valve 28, and the compressed air is released to the atmosphere by the emergency valve 28, thereby closing the full bottom valve 4 at once.

Next, the assembly work of the bottom valve 4 will be explained. Since the valve body 14 is formed to have the same diameter as the outer diameter of the casing 13 or a slightly smaller diameter, the valve unit 7 is inserted into the valve unit support member 11 from below,
The work is completed by fixing the valve unit support member 11, casing 13, and lid 16 together.

Further, the valve unit support member 11 is connected to the gutter member 10.
Although the depth of the gutter member 10 differs depending on the position of the bottom valve 4 (see Fig. 1), the insertion depth is small at a shallow position of the gutter member 10 and increased at a deep position, The valve unit 7 is the same and is installed as described above.

<Second Embodiment> As shown in FIG. 5, in this embodiment, instead of the valve unit 7 of the first embodiment being connected via the support 6, the valve unit 7 also served as a valve unit support member. A valve unit 40 having a casing 41 is directly connected to the ring member 8.

The casing 41 of the valve unit 40 has a horizontal cylinder part 41b connected to the upper part of the vertical cylinder part 41a, and a flange part 41c connected to the upper end thereof.
The upper end portion of the ring member 8 is fitted into the ring member 8, and the flange portion 41c is fixed to the ring member 8 with bolts 42. Further, a valve seat member 43 is mounted on the upper inner wall surface of the vertical cylindrical portion 41a, and a lid body 44 is mounted on the lower part of the bolt 4.
5, and an air port 46 is formed in the lid body 44. The valve seat member 43 has an inner ring part 43a and an outer ring part 43b connected by an arm part 43c, the outer ring part 43b is fixed to the casing 41 by a screw 47, and the two ring parts 43a and 43b form a communication path. There is.

The valve body 48 of the valve unit 40 has a disc-shaped main body 48.
A packing 48b is attached to the lower outer peripheral edge of the outer ring part 43b, and is seated on the upper inner peripheral edge of the outer ring part 43b. Further, the outer diameter of the valve body 48 is smaller than the inner diameter of the vertical cylindrical portion 41a.

The movable part 49 of the valve unit 40 has a vertical cylindrical part 41.
a piston 50 fitted in a vertically slidable manner;
Rod 5 connecting valve body 48 and piston 50
1. A fluid chamber 52 defined by the piston 50, the vertical cylinder portion 41a, and the lid 44, and the valve seat member 4
3 and the piston 50
It is composed of 3. The piston 50 is formed in an inverted bowl shape, and has an outer diameter larger than the inner diameter of the outer ring portion 43b of the valve seat member 43. Further, the rod 51 passes through the inner ring portion 43a, and the compression spring 53
urges the valve body 48 in the downward closing direction. The rest is the same as the first embodiment.

Therefore, compressed air is supplied to and exhausted from the fluid chamber 52 by operating the operation valve 31 and the emergency valve 28, and the valve body 48 moves up and down to open and close the discharge port 17.

In addition, if foreign matter mixed in the liquid gets caught in the piston seal and the piston 50 malfunctions, the valve body 48 is moved to the closed state regardless of whether liquid is stored in the storage chamber 3. Hold the lid 4
4 and perform inspection and repair.

Furthermore, when the discharge port 17 is closed, if abnormal pressure acts from the horizontal cylindrical portion 41b, that pressure will act on the upper surface of the piston 50 and the lower surface of the valve body 48, but the pressure received on the lower surface of the valve body 48 will Since the area is inside the outer ring portion 43b, the pressure-receiving area of the upper surface of the piston 50 is large, and therefore the valve body 48 due to abnormal pressure.
is pressed in the downward closing direction, and the discharge port 17 will not open.

(Effects of the Invention) As described above, according to the present invention, the casing, the valve body, and the movable part of the valve body are used as a valve unit, and the casing is fitted into the valve unit support member of the support body. This eliminates the need for alignment between the valve body and valve seat, and alignment between the valve body and other members, making it possible to easily attach the valve body to the tank body. Furthermore, since there are no parts above the opening, there is no residual liquid, and since the valve unit can be attached and removed from below the tank body, installation work and maintenance inspections can be carried out without entering the tank body. can be performed more easily.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the invention, and FIGS. 1 to 4 show a first embodiment, FIG. 1 being a partially sectional side view of the tank, and FIG. 2 taken along the line of FIG. 1. 3 is a central longitudinal sectional view of the bottom valve, FIG. 4 is an air control circuit diagram of the bottom valve, and FIG. 5 is a central longitudinal sectional view of the bottom valve of the second embodiment. 1...tank, 2...tank body, 3...containment chamber, 4
... Bottom valve, 5... Opening, 6... Support body, 7, 40... Valve unit, 10... Gutter member, 11... Valve unit support member, 13, 41... Casing, 14, 48... Valve body, 15, 49... Movable Part, 16, 44... Lid body, 1
7...Discharge port, 18,50...Piston, 19,51
... Rod, 20, 52... Fluid chamber, 21, 53... Compression spring, 22... Pressing member, 43... Valve seat member.

Claims (1)

[Claims] 1. A plurality of openings are provided at the bottom of the tank body, and a valve unit is connected below the openings via a support, and the support is connected to the bottom of the tank body. The valve unit includes a gutter member protruding downward and located outside the opening, and a valve unit support member connected to the gutter member, and the valve unit includes a casing fitted into the valve unit support member; A tank lorry comprising: a valve element that can be seated on the upper end of the casing; and a movable part that is built into the casing and connected to the valve element to open and close the valve element. Bottom valve. 2. The bottom valve for a tank lorry according to claim 1, wherein the casing has a removably attached lid at its lower end. 3. The movable part includes a piston that is slidably inserted into the casing, a rod that connects the piston and the valve body, a fluid chamber formed by the piston and the casing behind the piston, and a valve. The bottom valve for a tank lorry according to claim 1, further comprising a compression spring that biases the bottom valve in an opening/closing direction. 4. The bottom valve for a tank lorry according to claim 1, wherein the valve body has an outer shape that is the same as the outer shape of the casing. 5. The bottom valve for a tank lorry according to claim 1, wherein the valve body has an outer diameter smaller than the outer diameter of the casing. 6. The bottom valve for a tank lorry according to claim 1, wherein the gutter member has a substantially W-shaped cross section.