JPH1072088A - Discharge valve device for tank lorry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a valve opening and closing operation by forming a bottom valve for discharging liquid to be provided on the bottom side of a tank lorry from a single bottom valve. SOLUTION: An end of a rotating axis 13 extending in a bottom valve case 4 is connected to a bottom valve body 12 through a slide bar 14 and a crank 17, etc. A rotation lever 19 is rotatably attached to a protruding end of the axis 13 projecting from the case 4, and by turning the lever 19 from the outside at a position below the body 1, an opening 5A of a valve seat plate 5 is opened or closed through the body 12. A ring-shaped protrusion 12E is formed on the lower end surface of the body 12 to remove the protrusion 12E from a valve seat seal 7 provided on the plate 5 or to seat the protrusion 12E on the seal 7. The upper side surface 7A of the seal 7 is formed so as to be approximately flush with the upper side surface 5B of the plate 5, whereby when the valve body 12 is opened, liquid in the tank body 1 can be completely discharged to the side of the case 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge valve device for a tank lorry which is preferably used for discharging liquid from a tank body of a tank lorry for transporting liquid fuel such as gasoline or kerosene.

[0002]

2. Description of the Related Art Generally, a tank body provided on a tank truck and having a liquid chamber for containing a liquid, and a tank body provided on a lower side of the tank body and facing downward to discharge the liquid from the liquid chamber of the tank body. An open discharge port, a bottom valve case in which one side serves as a valve seat plate and is fixed to the lower end side of the discharge port, and the other side serves as a connection portion for external piping, and a valve seat plate of the bottom valve case. A discharge valve device for a tank lorry vehicle comprising a bottom valve body (hereinafter, referred to as a first bottom valve) which is raised and lowered in the discharge port so as to open and close the opened opening is disclosed in, for example, Japanese Utility Model Laid-Open Publication No.
No. 85607 (hereinafter referred to as a first prior art) and Japanese Patent Publication No. 56-312 (hereinafter referred to as a second prior art).

[0003] In this type of prior art tank lorry discharge valve device, for example, when discharging an oil liquid (liquid) such as gasoline, light oil or kerosene from a tank body into an underground tank or the like of a gas station. By moving the first bottom valve upward in the mouth and opening the opening of the bottom valve case, the oil liquid in the tank body is discharged from the outlet through the bottom valve case opening through the bottom valve case opening. While flowing into the case,
They are loaded and unloaded into an underground tank at a gas station via external piping or the like connected to the connection portion of the bottom valve case.

Here, an operation handle for the first bottom valve is provided above the tank body, and the operation handle is provided on the lower side of the tank body via a connecting rod extending vertically in the tank body. It is adapted to be connected to the first bottom valve provided. An emergency second bottom valve is provided in the discharge port in addition to the first bottom valve. When an emergency operation is required, an emergency lever or the like provided outside the tank body is operated. In addition, the discharge port opened by the first bottom valve is forcibly closed by the second bottom valve, thereby ensuring the safety of operation at the time of discharging fuel.

In the first prior art of the above prior arts, a ring-shaped projection is formed on an upper surface of the valve seat plate so as to surround an outer periphery of an opening of a bottom valve case.
An annular seal member or the like is provided on a lower end surface of the first bottom valve at a position corresponding to the projection. When the opening of the valve seat plate is closed by the first bottom valve, the seal member of the first bottom valve is seated on the projection of the valve seat plate, and the space between the valve seat plate and the first bottom valve is closed. It is kept in a sealed state to prevent the oil liquid in the tank body from leaking outside through the opening of the bottom valve case.

On the other hand, in the second prior art, a ring-shaped valve seat is provided on an upper surface of a valve seat plate so as to surround an outer periphery of an opening, and a first bottom valve is separated from the valve seat sealing portion. The opening is opened and closed by being seated.

[0007]

However, in the above-described discharge valve devices for tank trucks according to the prior arts, the first
Since the operating handle for operating the bottom valve is provided above the tank body, when opening and closing the first bottom valve, the operator needs to once climb above the tank body and then operate the operating handle. is there. Therefore, when the first bottom valve is opened and closed, such operation of the operation handle becomes a heavy burden on the operator, and there is a problem that workability and the like are significantly reduced.

In addition, it is necessary to provide a connecting member and the like between the operating handle and the first bottom valve for connecting the two, and an emergency second bottom valve and the like are connected to the first bottom valve. Need to be provided separately, there is a problem that the number of components constituting the entire discharge valve device is greatly increased, and the production cost and the like are reduced.

Further, in the first prior art among the above-mentioned prior arts, an annular projection is provided on the valve seat plate of the bottom valve case so as to surround the outer peripheral side of the opening of the bottom valve case. When the opening of the bottom valve case is opened by the bottom valve body and the liquid in the tank body is discharged to the outside from the discharge port, the liquid remains around the projection on the valve seat plate. In some cases, when the liquid contained in the tank body is replaced, a large amount of labor is required for cleaning the tank body.

In particular, when a chemical such as toluene (hereinafter referred to as a hazardous substance) is accommodated in the tank body and discharged to the outside, the hazardous substance is placed on the valve seat plate by the projection. Will remain. And
If another chemical (liquid) is supplied into the tank body in such a state, the liquid and the dangerous substance may be mixed with each other to cause a chemical reaction or the like. There is a problem that extra labor and time are spent for processing.

In order to avoid the above-mentioned chemical reaction, it is necessary to remove the liquid remaining in the tank main body by washing or the like, which makes such washing work complicated and troublesome. There is a problem that it takes time and the workability is reduced.

In the second prior art as well, since an annular recess is formed on the periphery (mounting flange portion) of the valve seat plate at a position radially outward of the valve seat seal, the liquid is stored in the tank. When the liquid is discharged, the liquid remains in these depressions, which causes almost the same problem as in the first related art.

On the other hand, in Japanese Utility Model Laid-Open No. 3-123180 (Japanese Utility Model Publication No. 8-38800), an opening provided in a bottom valve case is opened and closed by a single valve body, and an emergency valve is also used. There is disclosed a valve seat plate of a bottom valve case in which a body is separated and seated, in which a dent or the like as described in the second related art is eliminated.

However, in this prior art, when the opening of the bottom valve case is closed with the valve, the outer peripheral end face of the valve is provided on the outer peripheral side of the opening. Since it is only configured to elastically press against the upper end surface, it is difficult to increase the surface pressure from the valve element received by the seal member, and the sealing property between the seal member and the valve element is reduced. There is a problem that it cannot always be sufficiently increased.

In this prior art, a rod member extending downward from the opening in the bottom valve case is rotatably provided on the valve body, and a link member rotatably provided on the lower end side of the rod member is provided. By rotating the valve body from the outside, the valve body is moved up and down to close the opening. When the valve element is opened, the lower end of the link member is brought into contact with (collides with) the bottom side of the bottom valve element to regulate the maximum valve opening degree of the valve element. There is a problem that a scratch or a dent is easily formed on the bottom side of the body, and the oil liquid remains in such a scratch or a dent after the oil liquid is discharged.

The present invention has been made in view of the above-described problems of the prior art, and the present invention can easily perform both a normal valve opening and closing operation and an emergency valve opening and closing operation in a liquid discharging operation. An object of the present invention is to provide a discharge valve device for a tank lorry vehicle capable of remarkably improving workability and the like, drastically reducing the total number of parts and the like, and easily eliminating problems such as residual liquid when discharging liquid. The purpose is.

[0017]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tank body having a liquid chamber for storing a liquid, the tank body being provided in a tank truck, and a tank body provided below the tank body. A discharge port that opens downward to discharge liquid from the liquid chamber of the tank body, and a bottom where one side serves as a valve seat plate and is fixed to the lower end side of the discharge port, and the other side serves as a connection part for external piping. The present invention is applied to a tank lorry discharge valve device comprising a valve case and a bottom valve body which is moved up and down in the discharge opening to open and close an opening formed in a valve seat plate of each bottom valve case. .

The first aspect of the present invention is characterized in that the bottom valve case is opened and closed by opening and closing the bottom valve body by being externally rotated under the tank body. An opening / closing means is provided, and the bottom valve case has a flat surface on the upper side of the valve seat plate which is flat, and the valve seat plate is located around the opening and the upper surface is a flat surface of the valve seat plate. An annular valve seat seal having a flat surface substantially flush with the valve seat seal is provided, and the bottom valve body is provided with a ring-shaped projection separated from and seated on the valve seat seal, protruding toward the valve seat seal. It is in.

With this configuration, when the liquid is normally discharged from the liquid chamber of the tank main body, the bottom valve is opened by rotating the valve opening / closing means below the tank main body to open the liquid. The liquid is discharged through a discharge port opened into the room and an external pipe connected to a connection portion of the bottom valve case. Similarly, also in an emergency operation, the bottom valve body is forcibly closed by rotating the valve opening / closing means. Thus, the operator can easily turn the valve opening / closing means from the outside at the lower position of the tank body in both the normal operation and the emergency operation.

Even when the liquid level of the liquid chamber approaches the upper surface of the valve seat seal due to the discharge of the liquid, the upper surface of the valve seat seal is flush with the upper surface of the valve seat plate. The liquid is allowed to flow, and the liquid is reliably discharged from the outside to the inside in the radial direction of the valve seat seal toward the opening side, thereby preventing the liquid from remaining on the upper surface of the valve seat plate.
In addition, when the bottom valve body is closed, the ring-shaped projection is seated on the valve seat seal, so that the space between the bottom valve body and the valve seat seal can be maintained in a sealed state, and the opening of the valve seat plate is securely closed. can do.

According to the second aspect of the present invention, the valve opening / closing means includes a rotating shaft having one end rotatably disposed in the bottom valve case and the other end protruding outside the bottom valve case. ,
A connection link rotatably disposed between one end of the rotation shaft and the bottom valve body for opening and closing the bottom valve body when rotating the rotation shaft; and a protrusion of the rotation shaft. A rotation lever fixed to an end side and configured to rotate the rotation shaft from outside the bottom valve case; and a rotation lever positioned inside the bottom valve case and provided on an outer peripheral side of the rotation shaft; A stopper for restricting the maximum valve opening position of the bottom valve body by contacting a side wall portion of the bottom valve case at a position higher than the bottom portion, and the bottom valve case so as to constantly urge the rotating lever upward. And a spring for selectively rotating and holding the rotating shaft at one of a valve closing position of the bottom valve body and an opening position abutting on the stopper. .

As a result, when the rotation lever is rotated from outside the bottom valve case, the rotation shaft whose protruding end is connected to the rotation lever performs a rotation operation in the bottom valve case.
The bottom valve body is opened and closed via a connecting link rotatably provided between one end of the rotation shaft and the bottom valve body.

When the rotary shaft is rotated in the valve opening direction of the bottom valve body, a stopper provided on the outer peripheral side of the rotary shaft comes into contact with the bottom valve case. Since the provided spring urges the rotating lever upward, it is possible to regulate the maximum valve opening position of the bottom valve body and to keep the rotating shaft in the valve opening position. Also, by contacting the stopper with the side wall of the bottom valve case at a position higher than the bottom of the bottom valve case,
It is possible to reliably prevent scratches and the like from being formed on the bottom side of the bottom valve case due to contact (collision) of the stopper.

On the other hand, when the rotating shaft is rotated in the valve closing direction of the bottom valve body, the bottom valve body is seated on the valve seat seal via the ring-shaped projection, and in this state the spring is rotated. , The ring-shaped projection elastically strongly presses the valve seat seal, thereby reliably improving the sealing property between the ring-shaped projection and the valve seat seal. .

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a discharge valve device for a tank truck according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 to FIG. 6 show an embodiment of the present invention.

In the figure, reference numeral 1 denotes a tank body mounted on a tank truck, and the tank body 1 is defined by a partition 2 into a plurality of liquid chambers 3, 3 (only two are shown). In the chamber 3, as a liquid, for example, a chemical such as toluene,
Alternatively, an oil liquid such as gasoline or kerosene is stored. And the bottom 1A which is the lower side of the tank body 1
Each of the cylindrical outlets 1B has a base end side opening into each liquid chamber 3 and a front end side (lower end side) projecting downward.
(Only one is shown) is formed.

An annular flange 1C extends radially outward from the lower end of the outlet 1B, and a bottom valve case 4 described later is integrally attached to the flange 1C. . Further, as shown in FIG. 5, a plate-shaped bracket portion 1D is provided on the flange portion 1C of the tank body 1 and located above the bottom valve case 4 and to which a spring 21 described later is attached.

4, 4,... Are discharge ports 1B of the tank body 1.
A plurality of bottom valve cases (only two shown) are provided on each side, and the bottom valve case 4 is formed of a substantially L-shaped tube, and one side of the bottom valve case 4 extends radially outward in an annular shape. A thick valve seat plate 5 is integrally formed, and an annular connection flange 6 as a connection portion is integrally formed on the other side. The valve seat plate 5 has an opening 5A on the inner peripheral side located at the center thereof. Further, a boss portion 4A protruding in a substantially horizontal direction is formed at an intermediate portion of the bottom valve case 4. Further, as shown in FIGS. 2 to 4, the bottom valve case 4 is configured such that, of the intermediate portion between the boss portion 4A and the connection flange 6, a lower side of a slide bar 14 described later is moved from the boss portion 4A side to the connection flange 6 side. The part that extends in the horizontal direction with a gentle slope toward the bottom 4
B, and a portion at least higher than the bottom portion 4B is a side wall portion 4C.

Here, the upper side surface 5B of the valve seat plate 5 is formed as a flat surface as shown in FIGS. 2 to 4, and has a radially inner portion surrounding the outer peripheral side of the opening 5A from the outside. An annular groove 5C having a U-shaped cross section;
A shallow cutout groove 5D having a substantially L-shaped cross section is formed so as to surround the outer periphery of C from the outside. The valve seat plate 5 has an annular flange portion 5E at a portion radially outside the notch groove 5D, and the flange portion 5E is integrated with the flange portion 1C of the tank body 1 via a bolt (not shown) or the like. It is fixed in a state.

Reference numeral 7 denotes a valve seat seal provided on the valve seat plate 5 of the bottom valve case 4. The valve seat seal 7 is formed in a ring shape from a resin material or the like, and is provided in an annular groove 5C of the valve seat plate 5. It is fitted via a holding ring 8 described later. Here, as shown in FIGS. 2 to 4, the valve seat seal 7 is provided with an annular groove 5 of the valve seat plate 5.
It is formed in a substantially rectangular cross-section so as to correspond to the shape of C, and its thickness dimension is set to substantially match the groove depth of the annular groove 5C. Accordingly, the valve seat seal 7 is disposed at a position where the upper surface 7A is slightly lower (for example, by the depth of the cutout groove 5D) than the upper surface 5B of the valve seat plate 5, and the upper surface 7A Upper surface 5B is upper surface 8A of holding ring 8.
In addition, they are substantially flat and continuous with each other.

Reference numeral 8 denotes a press ring. The press ring 8 is formed as a ring-shaped thin plate, and is fixed in the cutout groove 5D of the valve seat plate 5 via a bolt (not shown) or the like. The holding ring 8 has its inner peripheral end formed with the notch groove 5D and the annular groove 5D.
The valve seat seal 7 is prevented from coming off by slightly extending radially inward from the boundary with C. Here, the upper surface 8A of the press ring 8 is formed as a flat surface similarly to the upper surface 5B of the valve seat plate 5 and the upper surface 7A of the valve seat seal 7, and is substantially flush with the upper surfaces 5B and 7A. It is arranged to become.

, 9, ... are four pillars (2) extending upward and downward in the shape of a prism inside the outlet 1B of the tank body 1.
(Only the book is shown), and each of the columns 9 is integrally attached with its lower end screwed to the valve seat plate 5 of the bottom valve case 4. An upper holder 10 described below is attached to the upper end side of each support 9 via each nut 9A or the like.

10 is opposed to the upper surface 5B of the valve seat plate 5,
An upper holder attached to the upper end of each column 9 is shown. The upper holder 10 is formed as a stepped annular body, and a guide cylinder 11 is fitted on the inner peripheral side thereof. The upper holder 10 is provided with a push rod 36 described later in the guide cylinder 11.
Is inserted, and the push rod 3 is inserted through the guide cylinder 11.
6 is slidably held in a vertical direction.

Numeral 12 denotes a bottom valve body which is located in the tank body 1 and separates from and seats on the valve seat seal 7. The bottom valve body 12 is shown in FIG.
As shown in FIG. 4, the outer diameter of the disk portion 12A is slightly larger than the inner diameter of the valve seat seal 7, and the lower portion of the disk portion 12A protrudes downward from the center of the lower surface side of the disk portion 12A. A pair of boss portions 12B, 12 connected to the upper end side
B and four guide plate portions 12C, 12 provided at positions spaced apart from each other in the circumferential direction of the disk portion 12A and protruding downward from the outer peripheral portion of the disk portion 12A with a certain length.
, And a small-diameter mounting cylinder portion 12D projecting upward from the center of the disk portion 12A and having a lower end side of the push rod 36 mounted on the inner peripheral side.

Each of the guide plates 12C is formed such that the outer surface thereof is substantially in sliding contact with the inner peripheral surface of the opening 5A of the valve seat plate 5, whereby the bottom valve body 12 is connected to the discharge port of the tank body 1. 1B is guided so as to be movable (elevated) in the axial direction of the opening 5A, that is, in the vertical direction.

Here, a ring-shaped projection 12E having a substantially semicircular cross section is integrally formed on the lower end side end surface of the disk portion 12A. When the bottom valve body 12 is seated on the valve seat seal 7 as shown in FIGS. 2 and 3, the ring-shaped projection 12E elastically presses the upper side surface 7A of the valve seat seal 7 so that The space between the body 12 and the valve seat plate 5 is securely sealed, and the opening 5A of the valve seat plate 5 is closed.

On the other hand, when the bottom valve body 12 separates from the valve seat seal 7 as shown in FIG.
When E is separated from the upper side surface 7A of the valve seat seal 7 by a certain dimension, the bottom valve body 12 opens the opening 5A of the valve seat plate 5, and the liquid in the tank main body 1 flows from the inside of the opening 5A to the bottom valve. The case 4 is allowed to flow out. The upper side surface of the disk portion 12A is formed as an inclined surface that is inclined downward from the radially inner side to the outer side.

Reference numeral 13 denotes a rotation shaft provided rotatably on each bottom valve case 4. The rotation shaft 13 has a boss portion at one end side inside the bottom valve case 4 as shown in FIGS. 4A
And the other end protrudes outside the bottom valve case 4. Further, a prism section 13A having a substantially square cross section is formed on one end side of the rotating shaft 13.

Each rotating shaft 13 constitutes a valve opening / closing means together with a slide bar 14, a crank 17, a rotating lever 19, a spring 21 and the like, which will be described later, and the valve opening / closing means is disposed below the tank body 1. The bottom valve 12 is opened and closed by rotating the rotating lever 19.

Reference numeral 14 denotes a slide bar as a connection link which is suspended downward from the bottom valve body 12, and the slide bar 14 pivots between the respective bosses 12B of the bottom valve body 12 via pins 15 at the upper end side. And the lower end is a valve seat plate 5
The opening 5A extends into the bottom valve case 4.
The lower end of the slide bar 14 is rotatably connected between the link portions 17B of the crank 17 via pins 16.

Reference numeral 17 denotes a crank provided in the bottom valve case 4 so as to rotate integrally with the rotation shaft 13. The crank 17 has a square hole 18 having a substantially square cross section on the inner peripheral side. A cylindrical portion 17A that becomes a part of the rotating shaft 13, a pair of link portions 17B and 17B formed to protrude from the cylindrical portion 17A toward the lower end of the slide bar 14, and a stopper 20 described later. Consists of The cylindrical portion 17A of the crank 17 has a square column portion 13A of the rotating shaft 13 fitted into the square hole 18 and is fixed to the rotating shaft 13 in a detented state. Each link portion 17B of the crank 17 forms a connection link together with the slide bar 14, and when the crank 17 is rotated together with the rotation shaft 13, the slide bar 14 is vertically displaced. .

Reference numeral 19 denotes a rotating shaft 13 from the outside of the bottom valve case 4.
As shown in FIGS. 2 to 5, the rotation lever 19 has a base end fixed to a protruding end of the rotation shaft 13 and a distal end (lower end) downward. And each of the operating levers 2 is connected to each of the wires 22A and 23A, which will be described later.
2. It is connected to the emergency lever 23. Here, as shown in FIG. 5, when the bottom valve body 12 is closed, the rotation lever 19 is turned to the valve closing position S1, and the bottom valve body 12 is closed.
Is opened to the valve opening position S2.

Reference numeral 20 denotes a rotary shaft 1 located in the bottom valve case 4.
The stopper 20 is provided on the outer peripheral side of the crank 3.
B is formed in a direction substantially opposite to the direction B, and a contact portion 20A is formed at the tip of the protrusion so as to contact the side wall 4C of the bottom valve case 4 with a large contact area. When the rotating shaft 13 is rotated to the valve opening position S2 as shown in FIG. 4, the stopper 20 is rotated by the contact portion 20A abutting against the side wall portion 4C of the bottom valve case 4. 13
Is restricted, and the bottom valve body 12 is held at the maximum valve opening position.

Reference numeral 21 denotes a spring provided outside the bottom valve case 4. The spring 21 is, as shown in FIG.
It is attached to extend and contract between the bracket portion 1D of the tank body 1 and the lower end of the rotating lever 19. The spring 21 urges the lower end of the rotating lever 19 upward at all times, and is arranged so as to be in a maximum extended state at an intermediate position S3 between the valve closing position S1 and the valve opening position S2. ing. Thus, the spring 21 allows the rotating lever 19 to selectively rotate between the valve closing position S1 and the valve opening position S2.

The spring 21 is connected to the stopper 20
And the rotating shaft 13 via the side wall 4C of the bottom valve case 4.
(Rotating lever 19) is pivotally held at the valve closing position S1, and the rotating shaft 13 is pivotally held at the valve opening position S2 via the ring-shaped projection 12E of the bottom valve body 12 and the valve seat seal 7. It has become.

Reference numerals 22, 22,... Denote operation levers (only two are shown in FIG. 1) rotatably provided on the lower side of the tank body 1, and each operation lever 22 is connected via a wire 22A or the like. The liquid is discharged from the respective liquid chambers 3 during normal operation or stopped during normal operation by being connected to the respective rotation levers 19 and being rotated from the outside.

Reference numeral 23 denotes an emergency lever which is located below the tank body 1 and is rotatably provided on the rear side of the vehicle.
The bottom valve body 12 is forcibly closed by being connected to the turning lever 19 via 3A or the like and being turned from the outside during an emergency operation.

Next, reference numeral 24 denotes an air introduction valve (only one is shown) provided for each liquid chamber 3 on the upper surface 1E of the tank main body 1. As shown in FIG. It is roughly constituted by a tubular flange 25, a guide plate 26, a valve seat cylinder 27, an upper valve body 29, a valve spring 33, and the like, which will be described later.

Reference numeral 25 denotes a plurality of cylindrical flanges (only one is shown) provided on the upper surface 1E of the tank body 1, respectively.
The cylindrical flange 25 is integrally formed on the upper surface portion 1E side by welding or the like, and an annular engaging projection 25A protrudes radially inward from an inner peripheral surface of the cylindrical flange 25 at a position corresponding to an axial intermediate portion. Is formed.

Reference numeral 26 denotes a guide plate. The guide plate 26 is formed of an annular plate, and a guide hole 26A is provided in the center of the guide plate 26 in the axial direction. Atmospheric inlets 26B, 26B,
... (only two are shown) are formed penetrating in the axial direction. The guide plate 26 is attached to the inside of the cylindrical flange 25 via the engaging projection 25A, and the guide hole 26
The distal end side of the push rod 36 is inserted into A, thereby holding the push rod 36 together with the guide cylinder 11 of the upper holder 10 in a vertically movable state.

Reference numeral 27 denotes a valve seat cylinder provided above the cylindrical flange 25. An annular valve seat portion 27A is formed on the inner peripheral surface of the valve seat cylinder 27 so as to protrude radially inward. Also,
A plurality of outside air introduction ports 27B, 27B,... Are formed in the peripheral wall portion of the valve seat cylinder 27 in the circumferential direction so as to be spaced apart from each other in the radial direction. The lower end of the valve seat cylinder 27 is screwed to the inner peripheral surface of the cylindrical flange 25 via an annular seal 27C or the like, and the space between the cylindrical flange 25 and the valve seat cylinder 27 is made liquid-tight by the annular seal 27C. Sealed.

Reference numeral 28 denotes a shim plate. The shim plate 28 is formed in a ring shape from a thin metal flat plate or the like, and is disposed in a gap between the lower end surface of the valve seat cylinder 27 and the upper surface of the guide plate 26. I have. The shim plate 28 presses the guide plate 26 against the engagement protrusion 25A of the cylindrical flange 25 by a tightening force when the valve seat cylinder 27 is screwed to the cylindrical flange 25, and presses the guide plate 26. It is fixed in the tubular flange 25 in a retaining state.

Reference numeral 29 denotes an upper valve body which is provided on the valve seat portion 27A of the valve seat cylinder 27 so as to be able to be separated and seated. The upper valve body 29 is formed as an annular flat plate, and has an annular outer peripheral portion on its lower surface. An annular concave groove 29A into which the seal ring 30 is fitted is formed. A disc-shaped holding plate 31 is attached to the lower surface of the upper valve body 29 via bolts 32 and the like.
At the radially outer end of the seal ring 30, the annular groove 29 is formed.
A is retained in A in a retaining state. Also,
The upper valve body 29 is provided between the valve spring 3 and a spring force adjusting plate 34 described later.
3 is compressed and constantly biased toward the valve seat 27A.

When the upper valve body 29 is seated on the valve seat 27A (the state shown in FIG. 6), the seal ring 30 is strongly pressed against the valve seat 27A by the valve spring 33, and the valve seat 27A The space between the upper valve body 29 and the upper valve body 29 is maintained in a sealed state.
When the upper valve body 29 is separated from the valve seat portion 27A, air flows into the tank body 1 through each outside air inlet 27B of the valve seat cylinder 27 and each atmosphere inlet 26B of the guide plate 26. To prevent the inside of the tank body 1 from being in a negative pressure state.

Numeral 34 denotes a spring force adjusting plate.
4 is screwed onto the inner peripheral surface on the upper end side of the valve seat cylinder 27, and by changing the screwing position of the spring force adjusting plate 34, the valve spring 33
Is adjusted appropriately.

Reference numeral 35 denotes a cover provided so as to cover the upper end portion of the valve seat cylinder 27. The cover 35 is formed in a closed cylinder shape, and its inner peripheral side is screwed to the outer peripheral surface on the upper end side of the valve seat cylinder 27. Have been. The cover 35 has a bore 35A at the opening end so that a constant gap is formed between the cover 35 and the outside air inlet 27B of the valve seat cylinder 27.

Reference numerals 36, 36,... Denote push rods extending vertically in the respective liquid chambers 3. The push rods 36 extend downward through the guide cylinders 11 of the upper holder 10 and the lower end of the bottom valve body 12 extends downward. The upper end is inserted into the guide hole 26A of the guide plate 26 and extends to the head 32A side of the bolt 32.

Here, a certain gap is provided between the upper end surface of the push rod 36 and the head 32A of the bolt 32. As a result, when the bottom valve body 12 is opened, the push rod 36 moves in the valve opening / closing direction of the bottom valve body 12 in conjunction with the valve opening operation of the bottom valve body 12, and the distal end face of the push rod 36 The head 32A is pushed up.

Reference numeral 37 denotes a cylindrical filter whose upper end is fixed to the outer peripheral portion of the upper holder 10 and whose lower end is fixed to the upper side surface 5B of the valve seat plate 5. 1 to filter the liquid flowing out into the discharge port 1B.

The discharge valve device for a tank truck according to the present embodiment is constructed as described above. As shown in FIG. 1, a liquid such as an oil liquid is supplied from the inside of each liquid chamber 3 of the tank body 1 to the underground tank 38 of the gas station. At the time of replenishment, a discharge pipe 39 for external piping is connected to the connection flange 6 of the bottom valve case 4, and an operator rotates each operation lever 22 below the tank body 1.

At this time, each wire 2
Each of the rotating levers 19 connected via 2A or the like is rotated from the valve closing position S1 shown in FIG. 5 to the valve opening position S2. 19
The rotary shaft 13 integrated with the crank 17 is rotated together with the crank 17. Thereby, the bottom valve body 12 connected to each link portion 17B of the crank 17 via the slide bar 14 is separated from the valve seat plate 5, and the opening 5A of the valve seat plate 5 is opened.

Here, since the crank 17 is provided with the stopper 20 and the spring 21 is provided between the bracket portion 1D of the tank body 1 and the rotating lever 19, the rotating lever 19 is moved to the valve opening position S2. 4 and 5, the stopper 20 abuts against the side wall 4C of the bottom valve case 4 as shown in FIG. 4 and FIG. . As a result, the rotating shaft 13 is connected to the stopper 20 and the spring 2
1, the valve opening position S2 can be maintained, and the maximum valve opening position of the bottom valve body 12 can be reliably regulated.

The opening 5A of the valve seat plate 5 is
2, the inside of the liquid chamber 3 communicates with the inside of the underground tank 38 via the bottom valve case 4, the discharge pipe 39, and the like. When the bottom valve body 12 moves upward and opens as described above, the push rod 36 attached to the mounting cylinder portion 12D of the bottom valve body 12 moves upward in the tank body 1 in conjunction with this movement. As a result, the head 32A of the bolt 32 attached to the upper valve body 29 is pushed upward by the distal end surface of the push rod 36, and the atmosphere introduction valve 24 is opened.

Thus, each outside air inlet 2 of the valve seat cylinder 27 is
Atmosphere is introduced into the tank main body 1 through the respective air intakes 26B of the guide plate 7 and the guide plate 26, and the inside of the tank main body 1 is maintained at the atmospheric pressure. Even if the liquid level in the tank body 1 changes, the internal pressure of the tank body 1 does not change, and the liquid in the liquid chamber 3 can be smoothly discharged and replenished into the underground tank 38. it can.

Here, the upper surface 5B of the valve seat plate 5, the upper surface 7A of the valve seat seal 7, and the upper surface 8A of the holding ring 8
Since the oil liquid in the tank body 1 is formed as flat surfaces that are substantially flush with each other,
Even when the oil liquid descends from the inside to the discharge port 1B and further approaches the upper surface 5B, the oil liquid flows on the upper surfaces 7A and 8A from the radially outer side to the inner side as shown in FIG.
The fluid can flow smoothly into the opening 5A in the direction.

The connection of the discharge pipe 39 between the tank body 1 and the underground tank 38 is disconnected or the discharge pipe 39 is disconnected.
In the event of an emergency such as when the vehicle is damaged, the operator rotates the emergency lever 23 on the rear side of the vehicle, thereby rotating each of the rotating levers 19 to the valve closing position S1 via the wire 23A. The bottom valve body 12 is all closed.

Also, at this time, the pivoting lever 19 is urged upward at the valve closing position S2 by the spring 21 in the same manner as when the valve is opened.
2E is seated so as to be strongly pressed onto the valve seat seal 7, whereby the space between the bottom valve body 12 and the valve seat seal 7 can be maintained in a sealed state via the ring-shaped projection 12E. The opening 5A of the plate 5 can be reliably closed, and the discharge of the oil liquid or the like from the discharge port 1B can be stopped urgently. When each of the bottom valve bodies 12 is normally closed by each of the operation levers 22, the operation of rotating each of the operation levers 22 stops the discharge of the oil liquid or the like in the same manner as in the emergency described above. Let it.

Thus, according to the present embodiment, the rotating shaft 13
Connect one end of the link (slide bar 14, crank 1
7) is connected to the bottom valve body 12 through the like and the rotation lever 19 is integrally provided on the other end side of the rotation shaft 13 protruding out of the bottom valve case 4. Each liquid chamber 3
Can be disposed below the tank main body 1 so that each operation lever 22 can be attached to the lower side of the tank main body 1 via each wire 22A. 23 can be attached to the rear side of the vehicle or the like via a wire 23A.

Therefore, in this embodiment, when the liquid is discharged normally, it is not necessary for the operator to operate the operation levers 22 after climbing above the tank body 1 as described in the prior art. The lever 22 can be easily operated on the ground. In the same manner, even during an emergency operation, the emergency lever 23 can be easily operated on the ground, and the burden on the operator during such a liquid discharging operation can be greatly reduced. Workability can be greatly improved. Further, as described in the related art, a connecting member or the like for opening and closing the bottom valve body 12 can be eliminated, and the number of parts and the like can be reduced.

Further, since the bottom valve body 12 can be used for both normal discharge and emergency stop, the first valve body and the emergency valve which are operated during normal discharge as described in each prior art. The second valve body or the like that is operated at the time of stop
Therefore, it is not necessary to provide the components separately, and the number of parts and the like can be reduced, thereby greatly reducing the production cost and the like.

Further, when a liquid such as an oil liquid or a chemical is discharged from the inside of the tank body 1, the liquid inside the tank body 1 is opened by opening the opening 5 A of the valve seat plate 5 with the bottom valve body 12. All of the liquid can be discharged from the discharge port 1B to the outside via the bottom valve case 4, the supply / discharge pipe 39, etc. without leaving the liquid. The inside of the tank main body 1 can be maintained in a cleaned state without any residual liquid only by washing a small amount of liquid or the like that has adhered. Thus, as described in the related art, when supplying the liquid into the tank main body 1, it is possible to reliably prevent the danger that the dangerous substance and the like remaining in the tank main body 1 are mixed with the liquid. As a result, the safety of the worker can be ensured, and the removal (cleaning) operation of the liquid can be performed in a short time, so that the workability can be greatly improved.

When the bottom valve body 12 is opened, the stopper 20 comes into contact with the side wall 4C at a position higher than the bottom 4B of the bottom valve case 4. Therefore, the stopper 20 comes into contact with the bottom 4B. Therefore, even if the contact portion 20A of the stopper 20 repeatedly collides (contacts) with the side wall portion 4C due to the valve opening operation of the bottom valve body 12,
It is possible to reliably prevent the formation of scratches and dents on the bottom 4B side due to such a collision. Even if the side wall 4C is formed with a flaw or dent, when the oil is discharged, the oil in the tank body 1 is entirely removed from the bottom 4B without leaving the oil in the flaw or the dent. Can be entirely discharged into the discharge port 1 </ b> B, whereby the oil liquid can be more reliably prevented from remaining in the tank body 1.

Further, the opening / closing operation of the atmosphere introduction valve 24 is automatically performed in conjunction with the opening / closing valve operation of each bottom valve body 12 by each push rod 36 attached to each bottom valve body 12, etc. The labor for the operator to open and close the air introduction valve 24 separately from the opening and closing operation of each bottom valve body 12 can be omitted, and the workability at the time of such opening and closing operation can be reliably improved.

In the above embodiment, the bracket 1D is provided below the tank body 1, and the spring 21 is mounted between the bracket 1D and the rotating lever 19. However, the embodiment is replaced with this. For example, a spring bracket may be provided on the bottom valve case 4 side, and the spring 21 may be mounted between the bracket and the rotating lever 19.

[0076]

As described in detail above, according to the present invention, by providing the valve opening / closing means in the bottom valve case, the valve opening / closing means can be externally rotated below the tank body. When the liquid is discharged normally, the operator does not need to operate the operation handle or the like after climbing above the tank body as described in the related art, so that the valve opening / closing means can be operated on the ground. In addition to being easy to operate, the valve opening / closing means can be easily operated on the ground even during an emergency operation, and the burden on the operator during such liquid discharge work can be greatly reduced. In addition, workability can be reliably improved. Further, since the bottom valve body can be used for both normal discharge and emergency stop, the first valve body and the second valve body can be used as described in each prior art.
It is not necessary to separately provide the valve body and the like in the tank body 1, whereby the number of parts and the like can be reduced, and the production cost and the like can be greatly reduced.

Further, since the upper surface of the valve seat plate and the upper surface of the valve seat seal of the bottom valve case are formed to be flush with each other, the liquid in the tank main body remains in the tank main body when the liquid is discharged. Without draining, all of the liquid can be discharged to the bottom valve case side, so that after the liquid is discharged, only the liquid adhering to the inner wall of the tank body or the like can be removed, and the residual liquid can be reliably removed from the tank body. This makes it possible to improve the safety during the operation, and to perform the cleaning operation inside the tank body in a short time and easily, thereby greatly improving the workability.

Further, since the bottom valve body is provided with a ring-shaped projection separated from and seated on the valve seat seal, the opening of the valve seat plate can be reliably opened and closed by the bottom valve body. Leakage of liquid from inside the tank body can be reliably prevented.

Further, according to the second aspect of the present invention,
A stopper is provided on the outer peripheral side of the rotating shaft that constitutes a part of the external operation means, and the stopper is provided in the bottom valve case, and the stopper is located at a position higher than the bottom of the bottom valve case. By contacting the bottom portion, the maximum valve opening position of the bottom valve body is regulated. Therefore, even if the stopper repeatedly collides (contacts) with the side wall portion in accordance with the valve opening operation of the bottom valve body, this position is not changed. It is possible to reliably prevent scratches and dents from being formed on the bottom side due to such a collision. Even if the scratches and dents are formed on the side wall side, the oil liquid in the tank body is discharged from the bottom side without leaving the oil liquid in such scratches and dents when the oil liquid is discharged. All of the oil can be discharged into the mouth, and the oil liquid can be more reliably prevented from remaining in the tank body.

Further, a spring is provided outside the bottom valve case so as to constantly urge the rotating lever upward, and the spring is used to set one of the open position and the closed position of the bottom valve body. Since the rotation shaft is selectively rotated and held, the bottom valve body can be kept in the valve-opening position via the stopper by the spring force of the spring when the bottom valve body is opened. Thereby, the valve opening operation of the bottom valve body can be easily performed. On the other hand, when the bottom valve body is closed, the spring force of the spring can keep the gap between the bottom valve body and the valve seat plate securely sealed through the ring-shaped projection. Can be easily performed.

[Brief description of the drawings]

FIG. 1 is an overall view showing a tank lorry discharge valve device together with a tank lorry according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the discharge valve device taken along the line II-II in FIG.

FIG. 3 is a sectional view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is an enlarged sectional view of a main part showing a state where an opening of a valve seat plate shown in FIG. 3 is opened by a bottom valve body.

FIG. 5 is an operation explanatory diagram showing a relationship between a rotating lever and a spring in FIG. 4;

FIG. 6 is an enlarged longitudinal sectional view showing an air introduction valve and the like in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank main body 1A Bottom part (lower part) 1B Discharge port 3 Liquid chamber 4 Bottom valve case 4B Bottom part 4C Side wall part 5 Valve seat plate 5A Opening part 5B Upper surface 6 Connection flange (connection part) 7 Valve seat seal 7A Upper surface 12 Bottom valve Body 12E Ring-shaped protrusion 13 Rotating shaft (valve opening / closing means) 14 Slide bar (connection link) 17 Crank (connection link) 19 Rotating lever (valve opening / closing means) 20 Stopper (valve opening / closing means) 21 Spring (valve opening / closing means) 39 Discharge pipe (external piping)

Claims (2)

[Claims] 1. A tank body provided in a tank truck and having a liquid chamber for storing a liquid, and a tank body provided at a lower side of the tank body and opening downward to discharge the liquid from the liquid chamber of the tank body. A discharge port, a valve seat plate on one side is fixed to the lower end side of the discharge port, and the other side is formed on a valve seat plate of each of the bottom valve cases. A bottom valve body which rises and lowers the inside of the discharge port so as to open and close the opening portion, wherein the bottom valve case is externally rotated below the tank body in the bottom valve case. A valve opening / closing means for opening / closing the bottom valve body by opening and closing the bottom valve body. The bottom valve case has a flat surface with the upper side of the valve seat plate flattened. And the upper side is a flat surface substantially flush with the flat surface of the valve seat plate. A discharge valve device for a tank lorry vehicle, wherein a ring-shaped projection is provided on the bottom valve body so as to protrude toward the valve seat seal. 2. The valve opening / closing means includes a rotating shaft having one end rotatably disposed in the bottom valve case and the other end protruding outside the bottom valve case, and one end of the rotating shaft. A connection link rotatably disposed between the bottom valve and the bottom valve, the connection link being configured to open and close the bottom valve when the rotation shaft is rotated, and the bottom valve fixed to a protruding end of the rotation shaft; A rotation lever for rotating the rotation shaft from outside of the case, and a rotation lever provided inside the bottom valve case and provided on an outer peripheral side of the rotation shaft, wherein the bottom is located at a position higher than the bottom of the bottom valve case. A stopper for restricting a maximum valve opening position of the bottom valve body by contacting a side wall of the valve case;
The rotating lever is provided outside the bottom valve case so as to always urge the rotating lever upward, and the rotation lever is moved to one of a valve closing position of the bottom valve body and a valve opening position in contact with the stopper. 2. The discharge valve device for a tank truck according to claim 1, further comprising a spring for selectively rotating and holding a driving shaft.