JP2576469Y2 - Sealing device for suction and discharge valve of viscous fluid pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for improving the sealing performance of a suction / discharge valve of a viscous fluid pump for pumping a viscous fluid such as concrete.

[0002]

2. Description of the Related Art As a suction and discharge valve of a viscous fluid pump,
There are a swing valve type and a slide valve type.

As shown in FIG. 4, the former swing valve type is provided with two suction / discharge ports 2 on the outside of a viscous fluid hopper 1 provided with two suction / discharge ports 2 arranged side by side on the lower part of the front surface. The two fluid cylinders 3 are installed horizontally in correspondence with
A fluid piston 4 housed in the fluid cylinder 3 is integrally connected to a hydraulic piston of a main hydraulic cylinder (not shown) via a rod 5, and the two main hydraulic cylinders are alternately advanced and retracted. The fluid cylinders 3 are alternately reciprocated. On the other hand, an S-shaped oscillating tube 6 is housed in the hopper 1, and a seal ring 7 is attached to one end of the oscillating tube 6.
It is configured to be able to swing in the left-right direction by contacting a seal plate 8 attached to the inside of the two suction / discharge ports 2, and the other end of the swing tube 6 penetrates the back side of the hopper 1. A swinging cylinder (not shown) is connected via an operation lever 11 to a connecting shaft 10 fixed in the middle of the swinging pipe 6 so as to be connected to the pressure feeding pipe 9, and the reciprocating movement of the fluid cylinder 3 and the swinging pipe The viscous fluid in the hopper 1 sucked into the fluid cylinder 3 is fed through the inside of the oscillating tube 6 in association with the oscillating motion of the oscillating tube 6.

In the above-mentioned oscillating valve type suction / discharge valve, fluid pressure feed is performed by the close contact of a seal surface formed by a seal ring 7 attached to one end of the oscillating pipe 6 and a seal plate 8 at the suction / discharge port 2 of the hopper 1. At the time, that is, when the fluid in the fluid cylinder 3 is discharged through the oscillating pipe 6, the seal is performed. However, the seal surfaces of the seal ring 7 and the seal plate 8 are worn due to sliding. come. When a gap is formed between the seal ring 7 and the seal plate 8 due to wear, a viscous fluid may enter the gap therebetween. If a viscous fluid enters and accumulates in this portion, sealing cannot be performed, and It malfunctions.

In order to prevent such a situation, conventionally,
As shown in FIG. 5, the area of the surface 7a on the inside of the seal ring 7 where the viscous fluid contacts, and the seal ring 7
The area of the inner surface 7a is made larger than that of the outer surface 7b so as to make the area of the inner surface 7b larger than that of the outer surface 7b. The pressure in the pipe 6 causes the seal ring 7 to
Most of them try to press against, that is, to make them self-sealing.

[0006]

However, in the above-mentioned conventional sealing method, when the seal ring 7 and the seal plate 8 slide and wear to form a gap in the seal surface, the internal pressure of the fluid at the time of pressure feeding is increased. In actual use, the internal pressure of the fluid due to the area difference cannot follow the wear between the seal ring 7 and the seal plate 8 in actual use. Turned out to be impossible. In addition, as for the seal portion between the other end of the oscillating tube 6 and the pressure feed tube 9, the wear of the seal surface is left as it is at present, so that the seal surface wears and viscous fluid accumulates there. It was inevitable to come and malfunction.

Therefore, the present invention reliably presses the seal ring against the seal plate even if the seal surface between the seal ring at one end of the swing tube and the seal plate or the seal surface between the other end of the swing tube and the pressure feed tube is worn. It is intended to improve the sealing performance by doing so.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a seal ring is fitted to one end of a swing tube supported in a hopper, and the other end of the swing tube is connected to the hopper. One end of the above-mentioned rocking tube is swung to the left and right with respect to two cylinders which are connected to the pressure feeding pipe through the back side and connected to the two suction / discharge ports at the lower part of the front of the hopper from outside the hopper. The fluid is alternately communicated via a seal ring, and the suction and discharge of a viscous fluid pump which is fixed to the swinging tube and rotates the swinging shaft by rotating a connection shaft penetrating the front wall of the hopper. In a sealing device for a valve, an annular ring is formed between the rocking pipe on the back side of a seal ring which is fitted to one end of the rocking pipe and slides on a sealing surface of a seal plate on the hopper side. A space is formed and a lubricating fluid is sealed in the annular space. A sealing surface with the hopper-side seal plate is provided by filling a lubricating fluid into the annular space from the sealing hole and pressing the seal ring on the oscillating tube side from the back side at all times. And a seal ring which is fitted to the pumping tube to seal the pumping tube and the other end of the oscillating tube so as to slide on a sealing surface of a seal plate on the oscillating tube side. An annular space is formed between the tube and the pressure feed pipe on the rear side of the tube, and a sealing hole for sealing a lubricating fluid is provided in the annular space. By always pressing the seal ring on the tube side from the back side, the sealing surface with the seal plate on the oscillating tube side is brought into close contact. The sealing hole through which the fluid acts The lubricating fluid in the sealed hole for acting on the back side of the seal ring of flue side, 1
One pump is connected to supply the pressurized lubricating fluid to both the sealing holes. Further, in a configuration in which the connecting shaft fixed to the rocking tube is taken out through the front wall of the hopper, a thrust bearing is provided between the connecting shaft and the through hole of the hopper, and the rocking tube of the thrust bearing is provided. The end on the side of the thrust bearing may be brought into contact with the connecting shaft, and a lubricating fluid may be sealed in the end on the side of the thrust bearing opposite to the rocking tube to press the thrust bearing toward the rocking tube.

[0009]

[Function] If a lubricating fluid such as grease is sealed in the annular space on the back side of the seal ring on the oscillating tube side and the annular space on the back side of the seal ring on the pressure feed tube side and constantly pressurized, the oscillating tube side The seal plate on the hopper side is brought into close contact with the seal plate on the hopper side, while the seal ring on the feed tube side is brought into close contact with the seal plate on the oscillating tube side. Even if the seal ring slides on the seal plate to form a gap on the seal surface due to wear, the seal ring is automatically pushed to the seal plate side by the pressure of the enclosed lubricating fluid, and the seal surface adheres. And the sealing property is improved. Also, if the thrust bearing around the connecting shaft is always pressed toward the swinging tube, the swinging tube is pressed to the pumping tube without difficulty through the connecting shaft, and the sealing performance between the swinging tube and the pumping tube is improved. Can be achieved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which a seal ring 7 is fitted to one end of an oscillating tube 6 housed in a hopper 1, similarly to the oscillating valve shown in FIG. Then, the other end of the oscillating tube 6 penetrates through the hopper 1 and is connected to the pressure feeding tube 9, and the connecting shaft 10 fixed to the oscillating tube 6 is moved out of the hopper 1. Take out the connecting shaft 1
0, one end of the swing pipe 6 is swung to the left and right so as to be in communication with the fluid cylinder 3 through one of the two suction and discharge ports 2 of the hopper 1. In a portion where the seal ring 7 is fitted to one end of the swing tube 6, the seal is provided so that even if the seal surface with the seal plate 8 fixed to the hopper 1 is worn, adhesion can be obtained. An annular space 12 is formed on the back side of the ring 7, that is, on the swinging tube 6 on the side opposite to the seal plate 8, and a sealing hole 13 communicating with the annular space 12 is radially formed in a connecting portion 6 a with the connecting shaft 10. At the same time, the sealing hole 14 penetrating the shaft portion of the connecting shaft 10 is connected to the sealing hole 13, and a lubricating fluid such as grease is supplied from the sealing holes 14 and 13 to the annular space 12 on the back surface of the seal ring 7. And the lubricating fluid enclosed Pressure constantly pressurized to Ruringu 7 from the rear side so as to contact the sealing surface of the seal plate 8.

On the ground side, as shown in detail in FIG. 2B, a seal plate 15 is arranged so as to rotate together with the swing tube 6, and is supported rotatably and in a liquid-tight manner with respect to the hopper 1. The pumping pipe 9 connected to the oscillating pipe 6 is connected to the hopper 1, and a seal ring 16 is fitted inside the end face of the pumping pipe 9.
The seal surface of the seal plate 15 is in close contact with the sealing surface of the seal ring 15. Further, an annular space 17 is formed in the pressure feed pipe 9 on the back side of the seal ring 16, and a lubricating fluid such as grease is formed in the annular space 17. A sealing hole 18 for sealing the lubricating fluid is provided in the end of the pressure feed pipe 9 in the radial direction.
The sealing ring 16 is sealed in the annular space 17 so that the seal ring 16 is constantly pressurized from the back surface so that the adhesion of the sealing surface with the seal plate 15 is improved.

The supply source of the lubricating fluid to the seal rings 7 and 16 is common, and as shown in FIG. 1, the lubricating fluid such as grease discharged by being pressurized by the pump 19 is supplied to the safety valve 2.
0, the set pressure of the safety valve 20 is determined to supply a fluid pressure to the sealing holes 14 and 18, and excess lubricating fluid is returned to the tank 22 from the return line 21.

When the pump 19 is operated to supply a lubricating fluid such as grease to the sealing holes 14 and 18 at the set pressure of the safety valve 20, the lubricating fluid supplied to the sealing hole 14 is connected to the connecting portion with the connecting shaft 10. Through the sealing hole 13 provided in the radial direction, enters the annular space 12 on the back surface of the seal ring 7 and is stored there. On the other hand, the lubricating fluid supplied to the sealing hole 18 on the ground side is supplied to the annular space 17 on the back surface of the seal ring 16.
Enter and be stored here.

The lubricating fluid such as grease sealed in each of the annular spaces 12 and 17 is for applying an internal pressure to the seal rings 7 and 16 and does not wear out. Thus, the seal rings 7 and 16 can be constantly pressed from the back surface to bring the seal surfaces into close contact.

Therefore, the seal surfaces of the seal ring 7 and the seal plate 8 or the seal surfaces of the seal ring 16 and the seal plate 15 due to the swing of the swing tube 6 are worn, and a gap is formed between these seal surfaces. Even if such a situation occurs, the seal rings 7 and 16 can be smoothly driven into the seal plates 8 and 15 by the pressure of the lubricating fluid, and the sealing surfaces can be brought into close contact. At this time, the sealed lubricating fluid pressurizes the back surfaces of the seal rings 7 and 16, so that even if the seal surface is worn, it does not flow out beyond the seal rings 7 and 16.

FIG. 3 shows another embodiment of the present invention. In the configuration shown in FIGS. 1 and 2, a radial bearing may be provided between the connecting shaft 10 and the through hole 23 of the hopper 1. A thrust bearing 24 capable of functioning is mounted, an end of the thrust bearing 24 on the side of the swinging tube 6 is brought into contact with a flange portion of the connection shaft 10, and the hopper 1 and the boss portion 11 of the operation lever 11 are provided.
a between the holding plate 25 and the thrust bearing 2
4, a pressurizing portion 26 is formed between the anti-oscillating tube 6 end and
A sealing hole 27 for supplying a lubricating fluid such as grease to the pressurizing section 26 is provided from the outside of the hopper 1 to the pressurizing section 26,
A supply source of a lubricating fluid to the sealing hole 27 is connected to a pump 19 via a safety valve 20 as in the case shown in FIG. 27 to the pressurizing section 26 and the thrust bearing 2
4 to the oscillating tube 6 side, and the oscillating tube 6 of the thrust bearing 24 is pressed.
The end on the side is pressed against the connecting shaft 10. In the figure, the same reference numerals as those shown in FIG. 1 indicate the same components.

According to this embodiment, when the lubricating fluid is sealed in the thrust bearing 24 on the side opposite to the swinging tube through the sealing hole 27, the thrust bearing 24 is pressed toward the swinging tube 6 side. The end of the thrust bearing 24 on the rocking tube 6 side is connected to the connecting shaft 10.
Of the thrust bearing 24
Is pressed toward the oscillating tube 6, thereby pushing the connecting shaft 10 inward of the hopper 1. A gap can be prevented from occurring. In this case, the axis of the connecting shaft 10 coincides with the center of the swing of the swing tube 6, that is, the axis of the other end of the swing tube 6. , A uniform pressing force can be applied to the swing tube 6. As shown in FIGS. 1 and 2, a lubricating fluid is sealed in the back surface of the seal ring 7 and the oscillating tube 6 is pressed toward the pressure feed tube 9 by a reaction force when the seal ring 7 is pressurized from the back surface. However, in this case, a moment acts on the oscillating tube 6 to move the other end of the oscillating tube 6 to the pressure feeding tube 9.
However, there is an advantage that if the connecting shaft 10 is pushed, there is no possibility of the pushing.

The annular spaces 12 and 17 are filled with the seal rings 7 and 7 by a lubricating fluid such as grease sealed therein.
It is sufficient that the pressure can be applied from the back surface of the nozzle 16, and the position may be other than that shown in the drawings. Of course, various changes can be made without departing from the scope of the present invention.

[0020]

As described above, according to the seal device for the suction / discharge valve of the viscous fluid pump of the present invention, the seal ring is fitted to one end of the swing tube supported in the hopper, The other end of the oscillating tube is connected to two pressure-feeding pipes through the other end of the hopper through the rear side of the hopper, and connected to two suction / discharge ports at the lower front of the hopper from outside the hopper. The side is swung to the left and right to alternately communicate with each other via a seal ring, and the connecting shaft fixed to the swinging tube and penetrating the front wall of the hopper is rotated to swing the swinging tube. In a sealing device for a suction / discharge valve of a viscous fluid pump, an oscillating pipe which is fitted to one end of the oscillating pipe and slides on a sealing surface of a seal plate on the hopper side to be a back side of a seal ring. And an annular space is formed between By providing a sealing hole for sealing a lubricating fluid in the annular space, filling the lubricating fluid into the annular space from the sealing hole, and constantly pressing the seal ring on the rocking tube side from the back side. The sealing surface of the seal plate on the oscillating tube is fitted to the sealing plate on the oscillating tube so that the sealing surface of the sealing plate on the hopper side is in close contact with the sealing plate on the hopper side. An annular space is formed between the sliding pipe and the pressure feed pipe on the back side of the seal ring, and a sealing hole for sealing a lubricating fluid is provided in the annular space. By sealing the lubricating fluid and constantly pressing the seal ring on the pressure-feeding tube side from the back side, the sealing surface with the seal plate on the oscillating tube side is brought into close contact with the oscillating tube side. Lubricant flow on the back side of the seal ring And sealing inlet exerting, on the sealing-inlet for applying a lubricating fluid to the back side of the seal ring of the pumping pipe side, by connecting one pump,
Since the structure is such that the pressurized lubricating fluid is supplied to both the sealing holes, the seal ring itself is brought into pressure contact with the seal plate to form a metal touch, and the seal is brought into contact with the seal plate for sealing. There is no risk of damage at an early stage, and the adhesion between the seal ring and the sealing surface of the seal plate is enhanced. If a gap is created due to wear on the sealing surface, the seal ring can be driven smoothly and reliably. In addition, the sealing property can be improved, and a similar annular space is formed on the back side of the seal ring fitted to the pumping pipe also on the ground side connecting the rocking pipe and the pumping pipe to supply the lubricating fluid. The sealing ring on the pressure feed pipe side is pressed against the seal plate on the oscillating pipe side so that the sealing surface between the seal ring and the seal plate is sealed. The lubricating fluid acting on the back side of the seal ring on the oscillating tube side and the lubricating fluid on the pumping tube side have excellent effects, such as being able to always ensure close contact to improve the sealing performance. The lubricating fluid to be applied to the back side of the seal ring is pressurized by one pump and supplied simultaneously, so that uniform pressure acts on the back side of each seal ring to maintain balance,
Further, a thrust bearing having a function as a radial bearing is disposed between a connection shaft fixed to the swing shaft and a through hole of a hopper that penetrates the connection shaft to swing the swing tube,
The end of the thrust bearing on the rocking tube side is brought into contact with the connecting shaft, and a lubricating fluid such as grease is sealed in the end of the thrust bearing on the counter rocking tube side. By pressing, the oscillating tube can be horizontally pressed in the direction of the discharge tube via the connecting shaft, and the other end of the oscillating tube can be uniformly pressed against the discharge tube side. ,
An excellent effect that a gap is formed between the other end of the oscillating tube and the discharge tube to prevent an aggregate or the like from being caught can also be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIGS. 2A and 2B are enlarged views of a part of FIG. 1, wherein FIG. 2A is an enlarged view of a part I of FIG. 1 and FIG. 2B is an enlarged view of a part II of FIG.

FIG. 3 is a sectional view of a portion showing another embodiment of the present invention.

FIG. 4 is a sectional view showing an example of a swing valve type suction / discharge valve.

FIG. 5 is an enlarged view of a portion V in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hopper 2 Suction / discharge port 3 Fluid cylinder 6 Oscillating pipe 7 Seal ring 8 Seal plate 9 Pumping pipe 10 Connecting shaft 12 Annular space 13, 14 Enclosure hole 15 Seal plate 16 Seal ring 17 Annular space 18 Enclosure hole 23 Through hole 24 Thrust Bearing 26 Pressurizing part 27 Sealing hole

Claims (2)

(57) [Scope of request for utility model registration] 1. A sealing ring is fitted to one end of an oscillating tube supported in a hopper, and the other end of the oscillating tube is connected to a pressure feeding tube through a rear side of the hopper, and a front surface of the hopper. One end side of the oscillating tube is swung to the left and right with two cylinders connected from the outside of the hopper to two lower suction / discharge ports to alternately communicate with each other via a seal ring. In a sealing device for a suction and discharge valve of a viscous fluid pump, which is configured to rotate a connecting shaft fixedly penetrating a front wall of a hopper to swing the swinging tube, the sealing device is fitted to one end of the swinging tube. To form an annular space between the oscillating tube on the back side of the seal ring that slides on the seal surface of the seal plate on the hopper side, and to fill a lubricating fluid into the annular space. And a lubricating flow from the sealing hole to the annular space. The seal ring on the oscillating tube side is always pressurized from the back side by enclosing the body, so that the sealing surface with the seal plate on the hopper side is brought into close contact, and the other parts of the pressure feeding tube and the oscillating tube are To seal the end, an annular space is formed between the sealing surface of the seal plate on the swinging tube side and the sliding surface on the back side of the seal ring which is fitted to the pumping tube so as to slide. A sealing hole for sealing a lubricating fluid is provided in the annular space, a lubricating fluid is sealed in the annular space from the sealing hole, and the seal ring on the pressure feed tube side is constantly pressurized from the rear side. The sealing surface of the sealing plate on the oscillating tube side is brought into close contact with the sealing ring, and a sealing hole for allowing a lubricating fluid to act on the back side of the sealing ring on the oscillating tube side; Apply lubricating fluid to the back side In a sealed hole, 1
A seal device for a suction / discharge valve of a viscous fluid pump, wherein two pumps are connected to supply a pressurized lubricating fluid to both of the sealing holes. 2. A thrust bearing is provided between the outer periphery of a connecting shaft penetrating the front wall of the hopper and a through hole of the hopper front wall, and the end of the thrust bearing on the side of the swinging tube abuts on the connecting shaft. 2. A sealing device for a suction / discharge valve of a viscous fluid pump according to claim 1, wherein a lubricating fluid can be filled in the thrust bearing on the side opposite to the swinging tube so as to press the thrust bearing toward the swinging tube. .