JPH0697032B2 - Volume adjustable forced valve pump - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced valve pump capable of adjusting a discharge amount per cycle, and more specifically, a displacement amount of a valve seat of an intake valve is changed from the outside. The present invention relates to a forced valve pump whose volume can be adjusted.

[Conventional technology]

In a capacity-adjustable forced valve pump, a suction valve is assembled at the tip of a rod-shaped reciprocating member such as a piston rod, and the valve seat of the suction valve is moved along with the reciprocating movement of the rod-shaped reciprocating member. , And may be a sleeve with a through hole in addition to the plate member) and the stopper to introduce the fluid into the pump chamber in the axial direction of the rod-shaped reciprocating member.

Further, the pump chamber is formed by a cylinder pipe or the like assembled with the intake manifold and the discharge manifold, and the rod-shaped reciprocating member extends from the crankcase to the range of the cylinder pipe, penetrating the intake manifold, and externally. Not exposed.

Therefore, when the discharge amount per cycle is changed, the intake manifold, cylinder pipe and discharge manifold are disassembled in the conventional forced valve pump (eg, Japanese Utility Model Application No. 63-7083 (Japanese Utility Model Publication No. 1-113163)). Then, replace it with a cylinder pipe of a different size, or expose the tip of the rod-shaped reciprocating member by disassembling them, and in the intake valve assembled to the tip of the rod-shaped reciprocating member, set the gap between the valve element and the stopper. Need to change.

[Problems to be Solved by the Invention]

As described above, in the conventional forced valve pump, when the discharge amount per cycle is changed, the suction manifold and the cylinder pipe are disassembled, so the change of the capacity becomes extremely complicated, and the change of the forced valve pump capacity is actually Above, it's difficult.

An object of the inventions of claims 1 to 3 is to provide a capacity-adjustable forced valve pump whose capacity can be easily adjusted.

It is an object of the invention of claim 2 to provide a capacity-adjustable forced valve pump in which necessary parts can be easily processed.

An object of the invention of claim 3 is to further reduce the number of parts.

[Means for Solving the Problems]

The present invention will be described using the reference numerals of the drawings corresponding to the embodiments.

The displacement control type forced valve pump of claim 1 includes a rod-shaped reciprocating member (20) that reciprocates, and a stopper (38, 38b) fitted to the rod-shaped reciprocating member (20). The suction valve (26) includes a valve body (30) fitted to the rod-shaped reciprocating member (20) on the suction side of the stoppers (38, 38b),
When the rod-shaped reciprocating member (20) reciprocates, the stopper (38,3
8b) and the valve body (30), and the valve seat (28). The rod-shaped reciprocating member (20) has stoppers (38, 38b)
A collar (40, 40b) which is axially displaced integrally with the stopper (38, 38b) is fitted on the tip side of the stopper, and the rod-shaped reciprocating member (20) and the collar (40, 40b) are connected to the pump chamber (33). ) And the pump wall (34) on the tip side of the pump chamber (33), the tip reaches the outside of the pump wall (34).
The operation part (4 that can operate the axial position of the collar (40, 40b)
4, 62) are provided at the tip of the rod-shaped reciprocating member (20).

In the displacement control type forced valve pump according to claim 2, the stopper (38) and the collar (40) are separate members, and the biasing member (for pushing the stopper (38) toward the end of the collar (40) ( Four
6) is provided.

In the displacement control type forced valve pump of claim 3, the stopper (38b) and the operating portion (62) are further integrally connected to the collar (40b).

[Action]

In the invention of claim 1, in the discharge stroke in which the rod-shaped reciprocating member (20) moves toward the tip thereof, the valve seat (28) of the suction valve (26) has a rod-shaped reciprocating member ( 20)
To the base end side of the rod-shaped reciprocating member (20), the valve body (30) is pressed, the suction valve (26) is closed, and the pump chamber through the suction valve (26) The introduction of fluid to (33) is stopped.

In the suction stroke in which the rod-shaped reciprocating member (20) moves toward the base end thereof, the valve seat (28) of the suction valve (26) is rod-shaped with respect to the rod-shaped reciprocating member (20) due to a pressure difference on both sides. Displacement toward the tip of the reciprocating member (20), abutting the stoppers (38, 38b), the suction valve (26) is opened, and the fluid passes through the suction valve (26) in the open state. It is introduced into the pump room (33).

The amount of fluid discharged from the pump chamber (33) per cycle is such that the valve seat (28) of the suction valve (26) starts contacting the valve body (30) at the beginning of the discharge stroke of the rod-shaped reciprocating member (20). It is a value obtained by subtracting the volume of the pump chamber (33) at the top dead center of the discharge stroke of the rod-shaped reciprocating member (20) from the volume of the pump chamber (33) at that time.

When changing the capacity, operate the operating part (44,62) exposed to the outside of the pump wall (34) to move the rod-shaped reciprocating member (20) and the collar (40,40b) in the axial direction. Change the relative position. The valve body (30) of the suction valve (26) is fixed in the relative position with respect to the rod-shaped reciprocating member (20) in the axial direction, whereas the stoppers (38, 38b) are provided in the rod-shaped reciprocating member (20). The relative position of the collar (40, 40b) to the rod-shaped reciprocating member (20) in the axial direction is changed in accordance with the change of the relative position of the collar (40, 40b). Therefore, the distance between the valve body (30) of the suction valve (26) and the stoppers (38, 38b) changes, and the suction valve (26) at the beginning of the discharge stroke of the rod-shaped reciprocating member (20).
The position of the valve seat (28), that is, the volume of the pump chamber (33) at the time when the valve seat (28) of (1) starts to come into close contact with the valve body (30), thereby changing the capacity.

In the invention of claim 2, the urging member (46) is the stopper (38).
Is pressed toward the collar (40), so the stopper (38)
Changes the axial position with respect to the rod-shaped reciprocating member (20) by following the change in the relative position of the collar (40) with respect to the rod-shaped reciprocating member (20) in the axial direction.

In the invention of claim 3, the operating portion (62), the collar (40b) and the stopper (38b) are integrally coupled to each other, so that the stopper (38b) is relative to the rod-shaped reciprocating member (20) in the axial direction. The axial position with respect to the rod-shaped reciprocating member (20) is changed by following changes in the relative positions of the operating section (62) and the collar (40b).

〔Example〕

 Hereinafter, the present invention will be described with reference to the embodiments of the drawings.

FIG. 1 is a sectional view showing the structure of a capacity-adjustable type forced valve pump. The crankcase 10, the intake manifold 12, the plurality of (for example, three) cylinder pipes 14, and the discharge manifold 16 are sequentially arranged in the horizontal direction, and are adjacent to each other and joined to each other and assembled. The suction chamber 17 is formed in the suction manifold 12, the suction pipe 18 is connected to a lower portion of the suction manifold 12, and an inlet 19 of the suction pipe 18 communicates with the suction chamber 17. The piston rod 20 has a small diameter portion 21 on the tip side and extends horizontally from the intake manifold 12 to form a cylinder pipe.
14 and the discharge manifold 16 are penetrated. Piston rod
The base end 20 is connected to a crank shaft (not shown) in the crank case 10 at its base end and reciprocates as the crank shaft rotates. The oil seal 22 is provided in the passage portion of the piston rod 20 in the crankcase 10 and is in sliding contact with the peripheral surface of the piston rod 20 to prevent leakage of lubricating oil from the crankcase 10. The seal packing 24 is provided at the joint between the crankcase 10 and the intake manifold 12, and keeps the intake chamber 17 watertight. The suction valve 26 is assembled to the base end portion of the small diameter portion 21, and is located at the stepped portion of the base end portion of the small diameter portion 21 by fitting with the valve seat 28 in which the small diameter portion 21 is loosely fitted. And a valve body 30. The piston packing 32 is fitted on the outer peripheral side of the valve seat 28 and is in sliding contact with the inner surface of the cylinder pipe 14 at the outer peripheral edge portion. The pump chamber 33 is formed in the range from the cylinder pipe 14 to the discharge manifold 16, and is partitioned from the suction chamber 17 by the piston packing 32. The holder 34 is detachably engaged with the penetrating portion of the piston rod 20 in the discharge manifold 16, and the seal packing 36 is sandwiched between the discharge manifold 16 and the holder 34. The stopper 38, the collar 40, and the washer 42 are sequentially located from the side closer to the suction valve 26, and are fitted into the small diameter portion 21, and the nut 44 is screwed to the tip of the small diameter portion 21, and the shaft of the piston rod 20. Color toward the tip direction
The movement of 40 mag is regulated. The small diameter portion 21, the tip of the seal packing 36, the washer 42, and the nut 44 are attached to the piston rod 20.
The seal packing 36 is held at a position outside the holder 34 in all the steps of (3), and the seal packing 36 keeps the pump chamber 33 watertight by sliding contact with the collar 40. The compression coil spring 46 is fitted in the small diameter portion 21 between the valve body 30 and the stopper 38, and presses the valve body 30 to the step portion of the piston rod 20 and the stopper 38 to the end of the collar 40. The discharge valve 48 is disposed on the side of the tip portion of the pump chamber 33, and prevents the backflow of the liquid from the discharge chamber 49 to the pump chamber 33. The discharge valve 48 includes a valve seat 50 that is applied to the stepped portion of the discharge manifold 16, a sack 54 that is provided with a through hole 52 on the side and is applied to the valve seat 50 from the discharge chamber 49 side, and is freely seated on the valve seat 50. It has a valve body 56 arranged in the sack 54 and a compression coil spring 58 for pressing the valve body 56 against the valve seat 50. The plug 60 is screwed into the discharge manifold 16 from the outside,
Abut the valve seat 50 and sac 54 to discharge manifold
It is pressed against the step inside 16.

The operation of the displacement-adjusting type forced valve pump of FIG. 1 will be described.

In the discharge stroke where the piston rod 20 moves toward its tip,
The valve seat 28 of the suction valve 26 is displaced toward the base end side of the piston rod 20 due to the sliding friction between the cylinder pipe 14 and the piston packing 32 and the pressure difference between the suction chamber 17 and the pump chamber 33, The suction valve 26 is in a closed state in close contact with the valve body 30. Also,
In the discharge valve 48, due to the high pressure on the pump chamber 33 side, the valve body 56
Is open from the valve seat 50 against the compression coil spring 58. As a result, the communication between the suction chamber 17 and the pump chamber 33 is blocked, and the introduction of the liquid from the suction chamber 17 into the pump chamber 33 is blocked. On the other hand, by opening the discharge valve 48, the pump chamber
The liquid 33 is discharged to the discharge chamber 49 via the discharge valve 48.

In the suction stroke in which the piston rod 20 moves toward its base end,
The valve seat 28 of the suction valve 26 has a tip end side of the piston rod 20 with respect to the piston rod 20 due to sliding friction between the cylinder pipe 14 and the piston packing 32 and a pressure difference between the suction chamber 17 and the pump chamber 33. Is displaced to contact the stopper 38, and the suction valve 26 is open. In the discharge valve 48, the valve body 56 is pressed against the valve seat 50 by the compression coil spring 58 because of the low pressure on the pump chamber 33 side, and is in the closed state. As a result, the delivery of the liquid from the pump chamber 33 to the discharge chamber 49 is stopped, and the liquid sucked from the inlet 19 of the suction pipe 18 is sucked into the suction chamber.
It is introduced into the pump chamber 33 through the outside of the valve body 30, the inside of the valve seat 28, and the outside of the stopper 38. This introduced liquid is
In the range from the suction chamber 17 to the pump chamber 33, the piston rod 20
Flows almost linearly along the axial direction of.

The amount of fluid discharged from the pump chamber 33 per cycle is determined by the volume of the pump chamber 33 at the time when the valve seat 28 of the suction valve 26 starts to come into close contact with the valve body 30 at the beginning of the discharge stroke of the piston rod 20. Pump chamber 33 at the top dead center of the discharge stroke of the rod 20
It is the value obtained by subtracting the volume of.

When changing the capacity, rotate the nut 44 exposed to the outside of the holder 34 so that the position of the nut 44 on the piston rod 20 and thus the piston rod 20 and the collar 40 with respect to the axial direction.
Change the relative position to. The valve body 30 of the suction valve 26 is pressed against the stepped portion of the small diameter portion 21 by the compression coil spring 58 to fix the relative position with respect to the piston rod 20 in the axial direction, while the stopper 38 is the compression coil spring. Since it is pressed against the end of the collar 40 by 46, the relative position of the collar 40 with respect to the piston rod 20 is changed in accordance with the change of the relative position of the collar 40 with respect to the piston rod 20. Therefore, the distance between the valve body 30 of the intake valve 26 and the stopper 38 changes,
The valve seat of the intake valve 26 at the beginning of the discharge stroke of the piston rod 20.
The position of the valve seat 28, that is, the volume of the pump chamber 33 when the valve 28 comes into close contact with the valve body 30 changes, and thereby the capacity changes. 1 in FIG. 1 indicates the displacement range of the valve seat 28 and the stopper 38.

FIG. 2 is a sectional view of a modified example of FIG. The valve body 30 of the suction valve 26 is formed integrally with the piston rod 20 at the position of the step of the base end of the small diameter portion 21. Further, a nut portion 62 and a stopper 38b are integrally formed at both ends of the collar 40b, and as a result, the collar 40b, the stopper 38b and the nut portion 62 are integrally formed in the axial direction of the piston rod 20. Move relative to. In this displacement control type forced valve pump, the washer 42 and the compression coil spring 46 of FIG. 1 are omitted, and the number of parts is reduced.

In the illustrated embodiment, the present invention is shown for a piston type forced valve pump in which the suction valve includes a plate-shaped valve body, but the suction valve is a plunger type in which the suction valve is displaced between the sleeve having the longitudinal through hole and the valve body. It is obvious to those skilled in the art that the present invention can be applied to a forced valve pump (eg, Japanese Utility Model Application No. 60-42984 (Japanese Utility Model Application Laid-Open No. 61-159678)).

〔The invention's effect〕

According to the first aspect of the present invention, the collar is fitted to the tip end side of the rod-shaped reciprocating member, and the rod-shaped reciprocating member and the collar reach the outside of the pump wall portion, and the stopper with which the valve seat of the suction valve abuts is the rod-shaped stopper. By operating the operating portion of the exposed end of the reciprocating member, the relative position of the collar with respect to the rod-shaped reciprocating member is changed as a medium. As a result, the volume of the pump chamber at the start of discharging the fluid changes, so that the capacity of the forced valve pump can be easily adjusted without disassembling the forced valve pump.

In the invention of claim 2, the urging member presses the stopper and the collar toward the operation portion, and as a result, the stopper and the collar can be moved in the axial direction of the rod-shaped reciprocating member according to the displacement of the operation portion. Therefore, it is not necessary to integrally form the operating portion and the collar, and the operating portion and the collar can be manufactured individually, and the processing or manufacturing of the operating portion and the collar is simplified.

According to the invention of claim 3, since the stopper is integrally connected to the collar, the axial position with respect to the rod-shaped reciprocating member can be changed by following the collar without using an urging member. . Therefore, the biasing member that presses the stopper toward the collar is omitted, and the number of parts as a whole can be reduced.

[Brief description of drawings]

1 is a sectional view showing the structure of a capacity-adjusting type forced valve pump, and FIG. 2 is a sectional view of a modification of FIG. 20 …… Piston rod (rod reciprocating member), 26 …… Suction valve,
28 …… Valve seat, 30 …… Valve disc, 33 …… Pump chamber, 34 …… Holder (pump wall), 38,38b …… Stopper, 40,40b …… Collar, 44 …… Nut (operating part) , 46 ... compression coil spring (biasing member), 62 ... nut part (operating part).

Claims (3)

[Claims] 1. A reciprocating rod-shaped reciprocating member (20) and stoppers (38, 38b) fitted to the rod-shaped reciprocating member (20).
A valve body (30) fitted to the rod-shaped reciprocating member (20) on the suction side of the stoppers (38, 38b), and the rod-shaped reciprocating member (20). ), The rod-shaped reciprocating member (20) is provided in the forced valve pump having a valve seat (28) which is displaced between the stopper (38, 38b) and the valve body (30) in accordance with the reciprocating movement of the rod. ) Is a collar (40,40) that is axially displaced integrally with the stopper (38,38b).
b) is fitted to the tip side of the stopper (38, 38b),
The rod-shaped reciprocating member (20) and the collar (40, 40b)
Penetrates the pump chamber (33) and the pump wall portion (34) on the tip side of the pump chamber (33) and reaches the outside of the pump wall portion (34) through the tip portion, and the collar (40, 40b). (4) An operating part (44, 62) capable of operating the axial position of (1) is provided at the tip of the rod-shaped reciprocating member (20). 2. The stopper (38) and the collar (40) are separate members, and the stopper (38) is the collar (40).
A capacity-adjusting type forced valve pump, characterized in that a biasing member (46) for pressing the end of the pump is provided. 3. The stopper (38b) and the operating portion (6)
2. The capacity-adjustable forced valve pump according to claim 1, wherein 2) is integrally connected to the collar (40b).