JPH04179872A - Reciprocating pump device - Google Patents

Abstract

PURPOSE:To exchange a packing easily and in a short time by arranging a packing case provided with a pressure-feed chamber, a shaft body and a packing for sealing the pressure-feed chamber detachebly on a pump main body. CONSTITUTION:In a reciprocating pump device 44, a plunger 14 is reciprocated in a pressure-feed chamber 30 of a pump main body 12, and pressure in the pressure-feed chamber 30 is alternately changed through its volume change, so that intake and discharge valves 32, 34 in a valve box 26 are opened or closed, and the fluid is taken in and discharged from the pressure-feed chamber 30. A packing case 48 provided with the pressure-feed chamber 30, the plunger 14 and a packing 22 for sealing the pressure-feed chamber 30 and the plunger 14 is detachebly arranged on the pump main body 12. The packing 22 can be exchanged easily and with a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reciprocating pump device, and more particularly to a reciprocating pump device that pumps slurry fluid such as cement milk or muddy water under high pressure.

[Conventional technology]

Conventionally, a reciprocating pump device used for grouting work, ground improvement work, polling work, etc. has a plunger 14 that is slidable in the axial direction within a pump body 12 of the reciprocating pump device IO, as shown in FIG. Supported by Further, the negative blade side of the plunger 14 is driven by a crank machine or the like via a connecting rod 16 so that it can reciprocate in the axial direction.

The plunger 14 and the connecting rod 16 are connected by a threaded portion 14A carved on one side of the plunger 14 screwing into the connecting rod 16, and a nut is screwed to prevent loosening. It is fixed at 20.

Further, a gasket 22 is installed inside the pump main body 12 and is tightened and fixed with a bolt 24, and the gasket 22 seals the pressure feeding chamber 30 and the plunger 14. The pump body 12 also includes a suction valve 32 that sucks the above-mentioned fluid from the valve box 26 into the pressure feeding chamber 30.
, and a discharge valve 34 for discharging fluid from the inside of the pumping chamber 30 to the valve box 28.

According to the reciprocating pump device 110 configured in this way, when the plunger 14 moves to the left in the figure, the pressure feeding chamber 3
Since the volume inside the valve increases and its internal pressure becomes negative, the discharge valve 340 and the ball valve 36 are urged by the spring 38 to close the flow passage 40. At the same time, the ball valve 42 of the suction valve 32 moves upward against the biasing force of the spring 44, opening the flow passage 46. by this,
Fluid can be sucked into the pressure feeding chamber 30 in the direction of the arrow.

Next, when the plunger 14 moves to the right in the figure, the volume inside the pumping chamber 30 decreases and its internal pressure increases, so that the discharge valve 340 and the ball valve 36 move upward against the biasing force of the spring 38. move and open the flow passage 40. Thereby, the fluid in the pressure feeding chamber 30 can be discharged in the direction of the arrow.

Therefore, by continuously reciprocating the plunge +14, fluid is continuously sucked and discharged.

[Problem to be solved by the invention: In such a reciprocating pump device, when the pressure inside the pumping chamber 30 becomes high, the gasket 22 compressed on the outer circumferential surface of the plunger 14 causes the plunger 14 to collapse due to the pressure of the fluid. Consolidate more strongly. When the plunger 14 reciprocates in this state, if the fluid is a slurry fluid such as cement milk or muddy water, solid matter will enter between the seal 22 and the plunger 14, accelerating the wear of the lip portion of the seal 22 in a short period of time. Therefore, the gasket 22 needs to be replaced.

However, in the conventional reciprocating pump device 10, when replacing the worn packing 22, first the plunger 14 is replaced.
must be removed from the connecting rod 16 and removed from the pump body 12 before replacement, which has the drawback of being complicated and time-consuming, and requiring a long time.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reciprocating pump device in which the gasket can be replaced easily and in a short period of time.

[Means to solve problems]

In order to achieve the above object, the present invention reciprocates a shaft body such as a plunger or a piston in a pressure-feeding chamber of a pump body, and alternately changes the pressure inside the pressure-feeding chamber by changing the volume of the shaft, thereby increasing the suction inside the valve box. In a reciprocating pump device that opens and closes a valve and a discharge valve to suck fluid into a pressure-feeding chamber and discharge it, a packing case including the pressure-feeding chamber and a packing that seals the shaft body and the pressure-feeding chamber is used as a pump body. It is characterized by being removably arranged on the.

[Effect]

According to the present invention, the gasket can be easily replaced by detachably mounting the gasket case provided with the gasket between the suction side and the discharge side of the valve box. Furthermore, by preparing another packing case, the packing can be replaced in a cartridge manner.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the reciprocating pump equipment according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of a reciprocating pump device according to the present invention, and the same or similar members as in the conventional example shown in FIG. 8 will be described with the same reference numerals.

According to FIG. 1, a plunger 14 is installed within the pump body 12 of this reciprocating pump family W44. A connecting rod 16 is screwed into a threaded portion 14A formed on the left end of the plunger 14 in the figure, and a nut 20 is tightened to prevent the connecting portion from loosening. A crank rod is connected to the left end (not shown) of the connecting rod 16, and the plunger 14 is driven by the crank rod.
can move back and forth in the direction of the arrow in the figure.

By the way, a pressure feeding chamber 30 is defined within the puffkin case 48. This packing case 48 is attached to the pump body 12.
0 It is inserted from the outside in the right direction in the figure.

The packing case 48 is formed into a cylindrical shape with a closed right end in the figure, and is inserted so that its central axis is coaxial with the plunger 14. Also, this Patsukin case 4
8 is fixed to the pump body 12 with bolts 50.

The packing 22 is attached in advance to the left end of the packing case 48 in the figure. The right end of the gasket 22 is positioned on a stopper portion 52 formed on the gasket case 48, and is integrated with the gasket case 48 by a bolt 24 screwed into the inner peripheral portion of the gasket case 48. The lip portion of the packing 22 is compressed onto the outer peripheral surface of the plunger 14 with a predetermined tightening margin.

Opposed holes 54 and 56 are opened in the packing case 48, and the holes 54 are connected to the intake valve 32 of the valve box 26.
The hole 56 is matched with the discharge passage 40 of the discharge valve 34.

Next, the operation of the reciprocating pump device configured as described above will be explained.

First, when the plunger 14 moves to the left in the drawing, the volume within the pressure-feeding chamber 30 increases and its internal pressure becomes negative. Thereby, the discharge valve 34 closes the discharge passage 40. At the same time, the suction valve 38 moves upward and opens the suction passage 46. Thereby, fluid can be sucked into the pressure feeding chamber 30 in the direction of the arrow.

Next, the reciprocating pump device 44 is activated to
4 moves rightward in the figure, the volume within the pumping chamber 30 decreases and its internal pressure increases. This causes the discharge valve 34 to move upward and open the discharge passage 40. This allows the fluid in the pressure feeding chamber 30 to be transferred to the hole 56 of the packing case 48,
It can be discharged through the discharge passage 40 in the direction of the arrow.

Next, a case where the seal 22 of the seal case 48 is replaced will be explained.

First, remove the bolts 50 that fixed the packing case 48. Next, while plunging the packing case 48,
From the opposite side of the connecting rod 16, that is, from the outside of the pump body 12, pull it out to the right in the figure.

Next, a new spare packing case 48 with a new packing 22 attached thereto is inserted in the opposite direction to the direction in which it was pulled out. At this time, the packing case 48 is installed so that the hole 54 of the gasket case 48 matches the suction passage 46 of the suction valve 32, and the hole 56 matches the discharge passage 40 of the discharge valve 34. This completes the replacement of the gasket 22.

In this way, in this embodiment, the gasket 22 is attached to the gasket case 48, and the gasket case 48 is made into a replaceable cartridge type, and is detachable from the outside of the pump body 12. Therefore, each time the gasket is replaced, the plunger is attached to the connecting rod. Compared to conventional reciprocating pump devices, which have to be removed from the pump, the gaskets can be replaced easily and in a short time.

However, in the first embodiment, the suction passage 4
6. The fluid passing through the discharge passage 40 is connected to the gasket case 48.
It leaks from the gap between the insertion surface and the pressure-feeding chamber 30 inside, flows out to the outside, and ceases to function as a pump.

In order to eliminate such problems, there is a reciprocating pump device shown in FIGS. 2 and 3.

According to FIGS. 2 and 3, a pair of seals 58 and 60 are installed in grooves on the outer peripheral surface of the packing case 48 and centered on the central axis of the packing case 48. As shown in FIGS. Further, the seal 58.60 is connected to the hole 54.56 of the packing case 48.
It is placed between the two.

When inserting the gasket case 48 into the pump body 12, the gasket 58 should be made slightly smaller in diameter than the gasket 60 (Fig. 2) or The inner periphery of the pump body 12 and the outer periphery of the packing case 48 at the intermediate portion between the packing 58 and the packing 60 are each formed into a slightly concave shape (FIG. 3).

According to FIGS. 2 and 3 configured in this way, it is possible to reliably prevent fluid from leaking to the outside.

However, Figure 2, Figure 31! In the reciprocating pump device shown in FIG. 4, the insertion surface is formed in a stepped or concave shape, so that there is a gap between the outer periphery of the packing case 48 and the inner periphery of the pump body 12, as shown in FIG. 63 is defined. Then, fluid flows into the gap 63. At this time, if the fluid is cement milk, the cement milk may remain in the gap 63 and harden into a lump 65, making it difficult to pull out the packing case 48.

Further, the solidified cement milk mass 65 peels off or moves and remains around the suction valve 32 and the discharge valve 34, preventing the suction and discharge functions, and eventually stops functioning as a pump.

In order to eliminate such problems, there is a reciprocating pump device shown in FIGS. 5 and 6.

51st! According to IS figure 6, a pair of seals 66.68
is attached to the outer peripheral surface of the packing case 48 and around the central axis of the holes 54 and 56. This prevents fluid from flowing into the gap 63 shown in FIG. 4, and solves problems caused by sedimentation and caking of cement milk when the packing case 48 is pulled out, as well as obstruction of suction and discharge functions. can.

However, the 5th t! l, reciprocating pump it in Fig. 6
However, damage to the knobs 66 and 68 when the puffkin case 48 is press-fitted cannot be avoided.

Therefore, there is a reciprocating pump device shown in FIG. 7 as a reciprocating pump device that completely eliminates the problems described above.

According to FIG. 7, a tapered chi 7zN surface is formed in the insertion direction of the paddle twin case 70 on the insertion surface of the gasket case τ', the suction valve 32, and the discharge valve 34. Further, seals 72, 74 are installed on the outer peripheral surface of the packing case 70 and around the central axis of the holes 54, 56, as shown in FIGS. 5 and 6.

Accordingly, as shown in FIG. 7, since the front pressure-fitting surface is formed in a tapered shape, the seals 72 and 74 are not damaged when the packing case 70 is inserted. Therefore, even if cement milk remains in the gap on the inner periphery of the packing on the insertion surface and solidifies, the packing case 70 can be easily replaced in a short time.

Further, in this embodiment, a packing case is attached between the intake valve and the discharge valve of the valve box, but the arrangement of the valves is not limited to this and can be applied to any case.

〔Effect of the invention〕

As explained above, according to the reciprocating pump device according to the present invention, the packing is attached to the puffing case, and the driving device of the shaft body is attached to the pressure feeding chamber from the opposite side so that the packing case can be attached and detached from the outside of the pump body. Since the packing is inserted into the shaft, the packing can be replaced easily and in a short time without removing the shaft body from the drive device.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a reciprocating pump device according to the present invention, FIG. 2 is a cross-sectional view showing a second embodiment of a reciprocating pump device according to the present invention, and FIG. 3 is a cross-sectional view showing a second embodiment of the reciprocating pump device according to the present invention. A sectional view showing the 9J3 embodiment of the reciprocating pump piping according to the above, the 4th m is 13
5 is a cross-sectional view taken along line A-A in the figure, FIG. 5 is a cross-sectional view showing a fourth embodiment of the reciprocating pump device according to the present invention, and FIG.
The figure is a sectional view taken along line B-B in FIG. 5, FIG. 7 is a sectional view showing a fifth embodiment of a reciprocating pump device according to the present invention, and FIG. 8 is a sectional view of a conventional reciprocating pump device. It is a sectional view showing an example. 12...Pump body, 14...Plunger, 2
2... Packing, 30... Pressure feeding chamber, 32...
Suction valve, 34... Discharge valve, 44... Reciprocating pump device, 48.70... Packing case,

Claims (2)

[Claims] (1) By reciprocating shaft bodies such as plungers and pistons in the pressure-feeding chamber of the pump body, and alternating the pressure inside the pressure-feeding chamber by changing the volume, the suction valve in the valve box
In a reciprocating pump device that opens and closes a discharge valve to draw in and discharge fluid into a pressure-feeding chamber, a packing case including the pressure-feeding chamber and a packing that seals the shaft and the pressure-feeding chamber is removable from the pump body. A reciprocating pump device characterized in that it is arranged in a. (2) The packing case and the pump body are axially tapered and fitted together, and a seal member is provided on each communication surface of the suction passage and discharge passage of the packing case that communicates with the valve box. The reciprocating pump device according to claim 1, further comprising a reciprocating pump device.