JPH086686B2 - Piston pump - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a piston pump used in a power sprayer or the like, and more particularly to a piston packing or the like without disassembling a manifold and a crankshaft from a crankcase. It relates to a replaceable piston pump.

[Conventional technology]

Japanese Utility Model Unexamined Publication No. 60-173677 discloses a structure of a plunger pump in which the seal packing can be replaced from the tip side of the crankcase without disassembling the crankshaft from the crankcase only by removing the manifold from the crankcase. However, in a large-capacity reciprocating pump, the weight of the manifold becomes large, and removal of the manifold from the crankcase becomes complicated.

In view of this, Japanese Patent Laid-Open No. 63-57879 discloses that a seal case into which a seal packing is inserted is detachable from the outside of the manifold, and the seal case is removed from the outside of the manifold to disassemble the crankshaft from the crankcase. Disclosed is a plunger pump capable of taking out the seal packing to the outside by omitting the disassembly of the manifold from the crankcase. Incidentally. Japanese Unexamined Patent Application Publication No. 63-57879 discloses an actual development of Sho 60.
As in Japanese Patent No. 173677, the intake valve and the discharge valve are fitted in the manifold and fixed by a screw-type valve retainer.

[Problems to be Solved by the Invention]

The problems of the structure disclosed in JP-A-63-57879 are listed below.

(A) At the time of repair and maintenance, it is necessary to check the intake valve and the discharge valve together with the seal packing, but it is necessary to remove the intake valve and the discharge valve together with the seal packing from the manifold by removing the valve retainer, which is troublesome. It takes.

(B) Since the high pressure on the discharge side is applied to the manifold, the thickness of the manifold is increased in order to secure a predetermined strength, which increases the weight of the entire pump.

(C) In order to change the capacity, it is necessary to change the diameter of the seal case and the diameter of the plunger, and it is impossible to easily change the capacity.

An object of the invention of claim 1 is to solve the problems (a) and (b) in a piston pump that realizes repair and inspection of piston packing and the like by omitting disassembly of a drive shaft and a cylindrical housing from a crankcase. It is to overcome.

An object of the invention of claim 2 is to further overcome the problem of (c).

[Means for solving the problem]

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

The piston pump of claim 1 has the following components (a) to (e).

(A) Reciprocating member (18) that reciprocates in the tubular housing (14) and has a pump chamber (46) on the inner peripheral side of the tip end portion (b) (b) Removably fitted into the tip end side of the tubular housing (14) Fitting member (48) provided with discharge passageway (52) (c) Piston packing (which is fixed to this fitting member (48) and comes into sliding contact with the peripheral wall of the pump chamber (46) as the reciprocating member (18) reciprocates. 58) (d) Suction valve (26) (e) Fitting member (48) disposed inside the pump chamber (46) so that it can be inserted into and removed from the tip of the reciprocating member (18) inside the reciprocating member (18). ) In the piston pump according to claim 2, the sleeve (28) forming the pump chamber (46) on the inner peripheral side is separate from the reciprocating member (18). And is removably attached to the reciprocating member (18).

[Action]

In the invention of claim 1, the piston packing (58)
Is fixed to the cylindrical housing (14) through the insertion member (48) and is held in a stationary state. The piston packing (58) and the reciprocating member are reciprocated as the reciprocating member (18) reciprocates. (18) moves relative to the axial direction of the pump chamber (46). Due to this relative movement, the volume of the pump chamber (46) increases and decreases, and during the period in which the volume of the pump chamber (46) increases, the suction stroke occurs, and the fluid enters the pump chamber (46) through the suction valve (26). Flow into. Further, during the period in which the volume of the pump chamber (46) decreases, the discharge stroke occurs, and the fluid in the pump chamber (46) is discharged by the discharge valve
The discharge in the fitting member (48) is carried out to the discharge passageway (52) via (0).

At the time of repair and maintenance, the fitting member (48) is removed from the tubular housing (14). The piston packing (58) is fixed to the fitting insertion member (48), and the discharge valve (60) is the fitting insertion member (48).
Since it is disposed inside, the piston packing (58) and the discharge valve (60) also move to the outside of the tubular housing (14) when the fitting insertion member (48) is taken out of the tubular housing (14). Taken out. On the other hand, the suction valve (26) has a reciprocating member (1
It is pulled out from the reciprocating member (18) from the tip of 8) and taken out of the tubular housing (14) from the tip of the tubular housing (14).

In the invention of claim 2, the piston packing (58) and the sleeve (28) relatively move in the axial direction of the pump chamber (46) with the reciprocating movement of the reciprocating member (18), and the piston packing (58) is Slide into contact with the inner circumference of the sleeve (28), and
The volume of 6) increases or decreases. When changing the capacity of the piston pump (10), remove the sleeve (28) from the reciprocating member (18), attach a sleeve (28) with a diameter corresponding to the new capacity to the reciprocating member (18), and A fitting insertion member (48) having a piston packing (58) corresponding to the diameter of the sleeve (28) fixed thereto is fitted and inserted into the cylindrical housing (14).

〔Example〕

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

FIG. 1 is a structural diagram of a main part of the triple piston pump 10. The triple piston pump 10 has a crankcase 12 that houses a crankshaft (not shown) therein, and a manifold 14 that is joined to the tip end side of the crankcase 12 in the horizontal direction. An intake port 16 is provided in the lower portion on the base end side. The reciprocating member 18 is connected to the crankshaft in the crankcase 12 via a connecting rod (not shown) on the proximal end side, and reciprocates as the crankshaft rotates. The two oil seals 20 are arranged at a predetermined distance in the axial direction of the reciprocating member 18 at a step portion near the joint between the crankcase 12 and the manifold 14, and on the inner peripheral side of the peripheral portion of the reciprocating member 18. Sliding contact prevents oil from leaking from the crankcase 12. The inner hole 22 is formed inside the tip of the reciprocating member 18 so as to open to the tip side of the reciprocating member 18.
The through hole 24 is a reciprocating member that faces the suction port 16 at one end.
Open in the peripheral part of 18, regardless of the reciprocating motion of the reciprocating member 18,
The inner hole 22 is maintained in a connected state with the suction port 16. The suction valve 26 is fitted into the inner side of the inner hole 22, and the sleeve 28 is screwed onto the tip side of the inner hole 22 to prevent the suction valve 26 from coming out of the inner hole 22. The suction valve 26 includes a valve seat 30 and a sack 32 which are joined to each other on the through hole 24 side and the sleeve 28 side, respectively, a valve element 34 which is seated on the valve seat 30 and is disposed in the sack 32, and a sack 32. A compression coil spring that is disposed inside and urges the valve element 34 toward the valve seat 30.
36, and the opening 38 is formed in the center of the end wall of the sack 32.

FIG. 2 is a perspective view of the sleeve 28. Sleeve 28
A cylindrical portion 40 that is screwed into the inner hole 22 of the reciprocating member 18 on the outer peripheral side.
And a flange 42 that comes into contact with the end of the reciprocating member 18. The groove 44 is formed in the flange 42 so that the tip of the driver can be locked.

Returning to FIG. 1, the pump chamber 46 is formed on the inner peripheral side of the tubular portion 40 of the sleeve 28. Plug member 48 (triple piston pump 10
There are 3 in total. ) Is a fitting insertion portion 50 that is screwed into the front end side opening of the manifold 14 to close the opening, and a fitting insertion portion 50.
Has a discharge passage 52 extending along the center line of the plug member 48 and opening outside the plug member 48, and a small diameter portion 56 protruding from the fitting insertion portion 50 toward the pump chamber 46 and having a diameter smaller than the inner diameter of the sleeve 28. A predetermined pipe line is connected to the outer end of the discharge passage 52 of each plug member 48 so as to collect the liquid from each discharge passage 52. The piston packing 58 is fitted on the end of the small diameter portion 56 on the pump chamber 46 side, and is in sliding contact with the inner circumference of the sleeve 28.
The discharge valve 60 is fitted into the discharge passage 52 from the outside of the plug member 48 until it comes into contact with the step inside the discharge passage 52, and is axially fastened by a snap ring 62. The structure of the discharge valve 60 is the same as that of the suction valve 26, and the structure from the pump chamber 46 to the discharge passage
Allow liquid flow to position 52.

 The operation of the embodiment will be described.

The reciprocating member 18 reciprocates in the axial direction with the rotation of the crankshaft in the crankcase 12. Piston packing 58
Is attached to the end of the small diameter portion 56 of the plug member 48 and is in a stationary state, but the reciprocating member 18, the sleeve 28, and the piston packing 58 cause the shaft of the reciprocating member 18 to follow the reciprocating motion of the reciprocating member 18. Relative to each other, the piston packing 58 slides on the inner circumference of the tubular portion 40 of the sleeve 28. As a result, the volume of the pump chamber 46 increases and decreases, and in the suction stroke in which the reciprocating member 18 moves toward the crankshaft, the volume of the pump chamber 46 increases, and the valve element 34 of the suction valve 26 resists the compression coil spring 36. And the suction valve 26 is opened, and the liquid flows from the suction port 16 into the pump chamber 46 through the through hole 24 and the suction valve 26. Also, in the discharge stroke in which the reciprocating member 18 is directed toward the plug member 48,
The volume of 46 decreases, the valve body 34 in the discharge valve 60 separates from the valve seat 30 against the compression coil spring 36, the discharge valve 60 opens, and the liquid in the pump chamber 46 passes through the discharge valve 60. Discharge passage 52
Is discharged to.

At the time of repair and maintenance, the plug member 48 is rotated through a tool such as a spanner and removed from the crankcase 12. Since the piston packing 58 is fixed to the plug member 48 and the discharge valve 60 is disposed inside the plug member 48, when the plug member 48 is taken out of the crankcase 12, the piston packing 58 and the discharge valve 60 are also cranked. It is taken out of the case 12. Next, the driver is inserted into the manifold 14 from the front end opening of the manifold 14, the tip of the driver is locked in the groove 44 of the flange 42 of the sleeve 28, and the sleeve 28 with respect to the reciprocating member 18 via the driver. The sleeve 28 is rotated to remove the sleeve 28 from the inner hole 22 of the reciprocating member 18, the suction valve 26 is pulled out from the inner hole 22 of the reciprocating member 18, and further taken out of the manifold 14 through the tip opening of the manifold 14.

When changing the capacity of the triple piston pump 10,
The stopper member 48 and the sleeve 28 are removed from the manifold 14 and the reciprocating member 18, respectively, and taken out of the manifold 14, and the sleeve 28 and the stopper member 48 having a diameter corresponding to the changed capacity are selected, respectively. The inner hole 22 and the manifold 14 are screwed together and mounted. As a result, the diameter of the pump chamber 46 is changed and the capacity of the triple piston pump 10 is changed.

〔The invention's effect〕

According to the invention of claim 1, since the piston packing is fixed to the fitting insertion member that is detachably fitted in the tubular housing, the piston packing can be removed from the tubular housing by removing the fitting insertion member from the tubular housing. It can be pulled out from the outside of the cylindrical housing, and disassembly of the cylindrical housing from the crankcase can be omitted. Since the discharge valve is arranged in the fitting member and the suction valve is removable from the tip side of the reciprocating member, the valve retainer is removed from the crankcase, and the discharge valve and the suction valve are connected to the crankcase. The take-out work is simplified as compared with the case of taking out from.

Further, according to the invention of claim 1, since the pump chamber is formed in the reciprocating member, and the discharge passage of the discharge fluid from the pump chamber is formed in the fitting member, the high pressure is applied to the cylindrical housing. Do not take it, reduce the thickness of the cylindrical housing,
The weight of the entire piston pump can be reduced.

According to the second aspect of the invention, the capacity of the piston pump can be changed by changing the sleeve having the predetermined diameter and the piston packing, and the reciprocating member does not need to be changed. Therefore, the capacity can be easily changed. .

[Brief description of drawings]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a structural view of a main part of a triple piston pump, and FIG. 2 is a perspective view of a sleeve. 10 ... Triple piston pump (piston pump), 14 ...
… Manifold (cylindrical housing), 18 …… Reciprocating member,
26 ... Suction valve, 28 ... Sleeve, 46 ... Pump chamber, 48 ...
… Plug member (fitting member), 52 …… Discharge passage, 58 …… Piston packing, 60 …… Discharge valve.

Claims (2)

[Claims] 1. A reciprocating member (18) which reciprocates in a tubular housing (14) and has a pump chamber (46) on the inner peripheral side of the tip portion, and a detachable fit on the tip side of the tubular housing (14). A fitting insertion member (48) that is inserted and has a discharge passageway (52) and is slidably in contact with the peripheral wall of the pump chamber (46) as the reciprocating member (18) is fixed to the fitting insertion member (48). A piston packing (58), an intake valve (26) disposed inside the pump chamber (46) so as to be inserted into and removed from the reciprocating member (18) from the tip end side of the reciprocating member (18), A piston pump comprising a fitting valve (48) and a discharge valve (60) which is removably disposed in the fitting member (48). 2. A sleeve (28) forming a pump chamber (46) on the inner peripheral side is provided separately from the reciprocating member (18),
The piston pump according to claim 1, wherein the piston pump is detachably attached to the reciprocating member (18).