JP2004285932A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device for improving the sealing performance among a plurality of pumps. <P>SOLUTION: A middle connection section 14 is arranged between flange sections 13, 13 in a plurality of pumps 11, 12, and the respective flange sections 13, 13 and the middle connection section 14 are connected by bolts 16. A waterproof sealing member 24 for preventing water from entering from the outside is provided between the flange sections 13, 13 and the middle connection section 14 of the plurality of pumps 11, 12. A sealing member 25 for preventing liquid leakage from the inside is provided between the flange sections 13, 13 and the middle connection section 14 of the plurality of pumps 11, 12 and at the inner-diameter side of the waterproof sealing member 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pump device having a plurality of pumps.
[0002]
[Prior art]
There is a multiple pump in which a plurality of pumps are connected in the axial direction so that they can be driven by a common drive shaft (for example, see Patent Document 1).
[0003]
This type of multiple pump has a flange portion fastened by bolts, a seal groove around the drive shaft is provided on a contact surface of the flange portion, and a seal member such as an O-ring is fitted into the seal groove. The seal member prevents liquid leakage from inside the pump.
[0004]
[Patent Document 1]
JP-A-9-184478 (page 2-3, FIG. 3)
[0005]
[Problems to be solved by the invention]
In this type of multiple pump, a so-called opening occurs on a contact surface of a flange portion which is fastened with bolts and sealed with a sealing member such as an O-ring due to its weight moment and vibration, and this opening causes an external opening. Water penetrates into the contact surface, and the seal groove formed in this contact surface is damaged by rust caused by water intrusion, preventing the seal from being maintained by the seal member and preventing liquid leakage from inside the pump. There is a problem that can not be done.
[0006]
The present invention has been made in view of such a point, and an object of the present invention is to provide a pump device that can improve sealing performance between a plurality of pumps.
[0007]
[Means for Solving the Problems]
The invention according to claim 1, a plurality of pumps having a contact surface that comes into contact with a mating member to be connected, an intermediate connecting portion disposed between the contact surfaces of the plurality of pumps and coupled with the contact surface and a fastening member, A waterproof sealing member provided between the contact surfaces of the plurality of pumps and the intermediate connection portion to prevent water from entering from outside, and a waterproof seal member between the contact surfaces of the plurality of pumps and the intermediate connection portion. A pump device comprising: a liquid leakage prevention seal member provided on the inner diameter side of the seal member to prevent liquid leakage from the inside; and provided between the contact surfaces of the plurality of pumps and the intermediate connection portion. The waterproof sealing member prevents water from entering from outside and prevents liquid leakage between the contact surfaces of the plurality of pumps and the intermediate connecting portion and on the inner diameter side of the waterproof sealing member. for Since the liquid member prevents leakage of liquid from the inside, the water that has entered from the outside can be prevented from reaching the liquid leakage prevention seal member by the waterproof seal member. The liquid leakage prevention seal member on the inner diameter side that is not damaged can reliably maintain the liquid leakage prevention performance for a long time.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS.
[0009]
FIG. 1A shows an external appearance of an axial piston pump having a multiple structure which is used as a main pump of a hydraulic circuit mounted on a construction machine such as a hydraulic shovel. , 13 and an intermediate connecting portion 14 is arranged between the flange portions 13 and 13 of the plurality of pumps 11 and 12. The flange portions 13 and 13 of the pumps 11 and 12 and the intermediate connecting portion 14 As shown in FIG. 1B, the bolts 16 are inserted into bolt insertion holes 15 of the flange portion 13 and screwed to the intermediate connecting portion 14 to be joined by bolts 16 as fastening members. A drive shaft 17 protrudes from the pump 11 on one side.
[0010]
As shown in FIGS. 1 (b) and 1 (c), the flanges 13 and 13 of the plurality of pumps 11 and 12 are provided with contact surfaces 21 which come into contact with mating members to be connected. , 13 are in close contact with one side surface and the other side surface of the intermediate connecting portion 14, respectively. In these contact surfaces 21, seal grooves 22, 23 around the drive shaft 17 are provided in a radially double manner. Have been.
[0011]
The large-diameter seal groove 22 is for waterproofing to prevent water from entering from outside, and the small-diameter seal groove 23 is for preventing liquid leakage such as hydraulic oil leakage from the inside.
[0012]
As shown in FIGS. 1 (a) and 1 (b), a large-diameter seal groove 22 is fitted between the flange portions 13 and 13 of the plurality of pumps 11 and the intermediate connecting portion 14 so as to be externally mounted. A waterproof seal member 24 for preventing water from entering from inside is provided, and between the flange portions 13 and 13 of the plurality of pumps 11 and 12 and the intermediate connecting portion 14, the inner diameter of the seal member 24 is smaller than that of the waterproof seal member 24. On the sides, there are provided liquid leakage preventing seal members 25 fitted in the small-diameter seal grooves 23 to prevent liquid leakage such as hydraulic oil leakage from the inside. These waterproof sealing member 24 and liquid leakage preventing sealing member 25 are so-called “O-rings”.
[0013]
As shown in FIG. 2, the waterproof sealing member 24 and the liquid leakage preventing sealing member 25 are formed by a contact surface 21 formed on an end surface of a pump casing 26 on one side and an end surface of a pump casing 27 on the other side. Are respectively fitted to the contact surfaces 21 formed.
[0014]
Inside these pump casings 26 and 27, two drive shafts 17 are coaxially coupled by a coupling 31 disposed in the intermediate connecting portion 14, and a cylinder block 32 is integrally rotated with these drive shafts 17 respectively. A plurality of pistons 33 arranged around each drive shaft 17 are slidably fitted in the cylinder block 32 substantially in the axial direction, respectively. Are connected to rotating rings 35, respectively, and these rotating rings 35 are rotatably abutted on swash plates 36, respectively, and these swash plates 36 are provided to be tiltable by respective swash plate tilt pistons 37. ing.
[0015]
Further, between each cylinder block 32 and the intermediate connecting portion 14, an arc-shaped suction hole (not shown) is formed in the suction area, and an arc-shaped discharge hole (not shown) is formed in the discharge area. Each of the valve plates 38 is provided, and the suction hole and the discharge hole of these valve plates 38 are connected to an external pipe via holes provided in the intermediate connecting portion 14.
[0016]
By controlling the position of the swash plate tilt piston 37 by an external control signal on the intermediate connecting portion 14, the tilt angle of the swash plate 36 is adjusted by the swash plate tilt piston 37, and the pump discharge flow rate is adjusted. Is variably controlled.
[0017]
In the pump device configured as described above, when each cylinder block 32 is rotated by each drive shaft 17, each piston 33 rotates around the drive shaft 17 together with each cylinder block 32, and the tilt angle of the swash plate 36 increases. The reciprocating motion of the corresponding stroke is repeated, and the liquid such as hydraulic oil is supplied into each cylinder block 32 from the external tank through the hole in the intermediate connecting portion 14 and the suction hole of the valve plate 38 by each piston 33 in the suction stroke. The liquid is discharged from each cylinder block 32 to the external pipe through the discharge hole of the valve plate 38 and the hole in the intermediate connecting portion 14 by each piston 33 in the discharge stroke while sucking.
[0018]
In such a pump device, a waterproof seal member 24 provided between the flange portions 13 and 13 of the plurality of pumps 11 and the intermediate connecting portion 14 prevents water from entering from outside, and A liquid leakage prevention seal member 25 provided between the flange portions 13 and 13 of the plurality of pumps 11 and 12 and the intermediate connection portion 14 and on the inner diameter side of the waterproof seal member 24 respectively causes liquid leakage from the inside. To prevent
[0019]
For this reason, a so-called mouth opening occurs between the flange portion 13 fastened by the bolt 16 and the intermediate connecting portion 14, and even if water tries to enter the contact surface 21 of the flange portion 13 from the outside due to the mouth opening, The water can be prevented from reaching the liquid leakage preventing seal member 25 on the inner diameter side of the waterproof sealing member 24 by the waterproof sealing member 24. Rust can be prevented from getting wet, and damage to the seal groove 23 and the like due to rust can be prevented, so that the liquid leakage preventing seal member 25 can reliably maintain the liquid leakage preventing performance for a long period of time.
[0020]
【The invention's effect】
According to the first aspect of the present invention, the waterproof seal members provided between the contact surfaces of the plurality of pumps and the intermediate connecting portion prevent water from entering from outside and contact the plurality of pumps. A liquid leakage prevention seal member provided between the surface and the intermediate connecting portion and on the inner diameter side of the waterproof seal member prevents liquid leakage from the inside, so that water entering from the outside is prevented from leaking. The seal member for waterproofing can be prevented from reaching the sealing member for waterproofing, and the sealing member for preventing liquid leakage on the inner diameter side which is not damaged by rust can reliably maintain the liquid leakage preventing performance for a long time.
[Brief description of the drawings]
FIG. 1A is a front view showing an embodiment of a pump device according to the present invention, FIG. 1B is a cross-sectional view of a portion where a seal member is fitted, and FIG. It is a front view which shows a surface.
FIG. 2 is a sectional view of the pump device.
[Explanation of symbols]
11, 12 Pump 14 Intermediate connecting part 16 Bolt 21 as fastening member Contact surface 24 Sealing member for waterproofing 25 Sealing member for preventing liquid leakage

Claims (1)

A plurality of pumps having a contact surface that comes into contact with a mating member to be connected;
An intermediate connecting portion disposed between the contact surfaces of the plurality of pumps and coupled by the contact surface and the fastening member;
A waterproof seal member provided between the contact surfaces of the plurality of pumps and the intermediate connecting portion to prevent water from entering from outside,
A liquid leakage preventing seal member provided between the contact surfaces of the plurality of pumps and the intermediate connecting portion and on the inner diameter side of the waterproof sealing member to prevent liquid leakage from inside; Pump device.

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