JPS641508Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a liquid pump that takes in and discharges low lubricity liquid such as water-soluble cutting oil and high water content hydraulic fluid.

Conventionally, in this type of liquid pump, a rotary shaft support part that rotatably supports a rotary shaft that rotatably drives a liquid conveying means that sucks and discharges a low-lubricity liquid housed in the pump body is driven by a low-lubricity liquid. In order to prevent poor lubrication, a sealing member is provided around the outer periphery of the rotating shaft to prevent the low-lubricity liquid leaking from the liquid conveying means from leaking along the outer periphery of the rotating shaft to the rotating shaft support. ing.

However, in order to obtain a good sealing effect, the sealing member has a leak-tight part made of an elastic material that is pressed against the outer circumferential surface of the rotating shaft, which prevents the liquid from getting mixed in with the low-lubricity liquid. The leak-proof part of the sealing member is easily damaged by foreign objects such as iron powder, and if used in a highly contaminated liquid device, the sealing effect of the sealing member will deteriorate in a short period of time, resulting in an extremely shortened pump life. There were flaws.

The present invention eliminates such drawbacks by making the sealing member less susceptible to the effects of low-lubricity liquid leaking from the liquid conveying means, and effectively sealing the liquid from leaking to the rotating shaft support for a long period of time. It is an object of the present invention to provide a liquid pump capable of performing a stopping action.

For this reason, the present invention incorporates a liquid conveying means so that the low lubricity liquid is sucked from the suction channel and discharged to the discharge channel by the rotational drive of the pump body rotation shaft, and the liquid conveying means is installed in the bearing hole provided in the pump body. The liquid conveyance means and the bearing member are configured to rotatably support the rotary shaft through the bearing member, and to prevent the low-lubricity liquid leaking from the liquid conveyance means from leaking along the outer periphery of the rotary shaft to the rotary shaft support. A sealing member is disposed on the outer periphery of the rotating shaft between the sealing member and the liquid conveying means by pressing a liquid leak-proofing part formed from an elastic material onto the outer periphery of the rotating shaft, and the sealing member is placed on the outer periphery of the rotating shaft between the sealing member and the liquid conveying means. A filtration member is provided to clean the leaking low-lubricity liquid, and the liquid conveyance means is configured to return the low-lubricity liquid that leaks from the liquid conveyance means and leaks to the filtration member along the outer periphery of the rotating shaft to the low-pressure part side. A liquid path is provided between the filter members and communicates with the low pressure section.

With this configuration of the present invention, the low-lubricity liquid that leaks from the liquid conveying means rotationally driven by the rotating shaft and flows along the outer periphery of the rotating shaft is refluxed from the liquid path toward the low-pressure section, and a portion of it is It is cleaned by the filtering member and leaks into the sealing member. For this reason,
A stable low pressure is applied to the sealing member to maintain the optimal pressure contact state of the leak-tight part to the outer peripheral surface of the rotating shaft. It is hard to be damaged and can perform a good sealing action over a long period of time to prevent liquid from leaking into the rotating shaft support.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 is the pump body, with one end recessed and a storage hole 2
A sub-body member 4 is integrally fixed to a main body member 3 which has a main body member 3 formed therein so as to close the opening of the housing hole 2, and a large number of vanes 5 are arranged radially in the housing hole 2 of the pump body 1. A slidable rotor 6 is rotatably provided, and a cylindrical movable ring 7 is provided eccentrically around the outer periphery of the rotor 6.
Side plate members 8 and 9 are disposed on both sides of the movable ring 7 to constitute a liquid conveying means 10 for sucking and discharging a low lubricity liquid. One side plate member 9 has a low lubricity liquid suction flow path 11 provided in the main body member 3.
An arc-shaped suction hole 13 and a discharge hole 14 are provided therethrough and communicate with the discharge flow path 12, respectively. 1
5 is a pump chamber formed by the vane 5, rotor 6, movable ring 7, and side plate members 8 and 9; 16 is a piston provided movably in the same direction as the moving direction of the movable ring 7; The tip contacts the outer peripheral surface of the movable ring 7 and presses it so that the amount of eccentricity between the rotor 6 and the movable ring 7 is maximized. Reference numeral 18 denotes a pressure adjusting member, which adjusts the force of the spring 17 by rotating it to set the maximum discharge pressure of the pump.
19 is a regulating member screwed onto the main body member 3 and regulating the maximum eccentricity between the rotor 6 and the movable ring 7;
Reference numeral 20 is a connection port for connecting the storage hole 2 to a storage tank (not shown) serving as a low pressure section. Reference numeral 21 denotes a rotating shaft, with a rotor 6 fixed to an intermediate shaft portion, and bearing members 24 and 25 such as needle bearings installed in bearing holes 22 and 23 penetrating through the main body member 3 and the sub-main body member 4, respectively. The main body member 3 is rotatably supported, and one end protrudes outside the main body member 3. 2
Numerals 6 and 27 are sealing members such as oil seal members arranged on the outer periphery of the rotating shaft 21 between the side plate members 8 and 9 and the bearing members 24 and 25 of the liquid conveying means 10, and are made of an elastic material and serve as liquid leakage prevention parts. Lip part, 2
8, 29 are pressed against the outer circumferential surface of the rotating shaft 21, and the low-lubricity liquid that leaks from the joint between the rotor 6 and the side plate members 8, 9 of the liquid conveying means 10 leaks into the rotating shaft support portion along the outer circumference of the rotating shaft 21. It is designed to prevent you from doing so. A cover member 30 is fixed to the outer surface of the sub-main body member 4 and closes the external opening of the bearing hole 23, and fills a space between the bearing hole 23 and the outer periphery of the rotating shaft 21 with a lubricant such as grease that communicates with the rotating shaft support. A storage chamber 31 is formed. 32 is a sealing member that is in pressure contact with the outer periphery of the rotating shaft 21 on the side that protrudes outside the main body member 3 and is attached to the opening of the bearing hole 22, and is a reservoir chamber filled with lubricant such as grease that communicates with the rotating shaft support. 33, which prevents the lubricant from leaking out of the main body member 3 along the outer periphery of the rotating shaft 21, and also prevents foreign matter such as dust from entering the storage chamber 33. 34 and 35 are the side plate members 8 and 9 and the sealing member 2
A plate-shaped protective member loosely fitted around the outer periphery of the rotating shaft 21 between 6 and 27 and disposed in the bearing holes 22 and 23 of the main body member 3 and the sub-body member 4 to prevent low lubricity from leaking from the liquid conveyance means 10. A gap H is formed between the outer periphery of the rotating shaft 21 and the liquid to prevent the liquid from directly leaking to the sealing members 26 and 27. Filter members 36 and 37 are provided to remove and clean foreign substances mixed in the lubricating liquid. Filter members 36, 37
are fixed to annular engagement grooves 38, 39 formed on the sealing member side of the protection members 34, 35 using pressing members 40, 41, and pressed against the outer peripheral surface of the rotating shaft 21 by their own elastic force. 42 and 43 are side plate members 8 and 9
Protective member 3
4, 35 is provided so that the low-lubricity liquid leaked to the low-pressure storage hole 2 is returned to the low-pressure storage hole 2. Reference numerals 44 and 45 denote coatings formed on the outer periphery of the rotating shaft 21 where the sealing members 26 and 27 contact, and a coating material such as ceramic is thermally sprayed to improve the wear resistance of the contact portions.

Next, the operation of this configuration will be explained.

Rotation of the rotary shaft 21 causes the rotor 6 to move in the direction of arrow F.
When the pump chamber 15 rotates in the direction, the volume of the pump chamber 15 changes according to the eccentricity of the rotor 6 and the movable ring 7, and the low lubricity liquid sucked from the suction passage 11 is discharged to the discharge passage 12, and as the discharge pressure increases. The movable ring 7 moves to a position concentric with the rotor 6 against the force of the spring 17 due to the force of the discharge pressure acting on the inner surface of the discharge hole 14 area of the side plate member 7, and controls the discharge amount to decrease to zero. When the pump is in operation, the low-lubricity liquid leaking from the liquid conveying means 10 through the joints between the rotor 6 and the side plate members 8 and 9 flows along the outer periphery of the rotating shaft 21, protecting members 34, 35, filtering members 36, 37
Although the liquid acts on the sealing members 26 and 27 through the liquid passage 4, it is prevented from being filtered out to the rotary shaft support.
2 and 43 to the storage hole 2, and is refluxed from the connection port 20 to the low pressure side. The low lubricity liquid that acts on the sealing members 26 and 27 is filtered by filtering members 36 and 37 provided in the protection members 34 and 35 to remove foreign matter, and the sealing members 26 and 27 are free from lip portions 28 caused by foreign matter. .
It rotates smoothly with lubricant filled to 0.30. Furthermore, the pressure fluctuation of the low-lubricity liquid leaking into the sealing members 26 and 27 is reduced by the throttling action of the filter members 36 and 37 during filtration, and the liquid passes through the liquid passages 42 and 43 toward the low-pressure side. The pressure becomes low due to reflux, and the lip portions 2 of the sealing members 26 and 27
8 and 29 can be kept in optimal pressure contact with the outer peripheral surface of the rotating shaft 21, and the durability of the sealing members 26 and 27 can be improved. Furthermore, due to the reflux of the low-lubricity liquid to the low-pressure part side, foreign matter that adheres to the filtration members 36 and 37 during filtration is washed away by the refluxed liquid and does not accumulate, thereby suppressing the deterioration of the filtration function. ,
Maintenance and management of the filter members 36 and 37 can be simplified.

In this way, the present invention houses and provides a liquid conveying means so that the low lubricity liquid is discharged from the suction flow path to the suction discharge flow path by the rotational drive of the pump body rotation shaft, and the liquid conveyance means is installed in the bearing hole provided in the pump body. The liquid conveyance means and the bearing member are configured to rotatably support the rotary shaft through the bearing member, and to prevent the low-lubricity liquid leaking from the liquid conveyance means from leaking along the outer periphery of the rotary shaft to the rotary shaft support. A sealing member is disposed on the outer periphery of the rotating shaft between the sealing member and the liquid conveying means by pressing a liquid leak-proofing part formed from an elastic material onto the outer periphery of the rotating shaft, and the sealing member is placed on the outer periphery of the rotating shaft between the sealing member and the liquid conveying means. A filtration member is provided to clean the leaking low-lubricity liquid, and the liquid conveyance means is configured to return the low-lubricity liquid that leaks from the liquid conveyance means and leaks to the filtration member along the outer periphery of the rotating shaft to the low-pressure part side. By providing a liquid path between the filtration members that communicates with the low-pressure part, a stable low pressure is applied to the sealing member, allowing the leak-tight part to maintain optimal pressure contact with the outer circumferential surface of the rotating shaft. The leak stop part of the stop member is made less likely to be damaged by foreign matter in the leaked liquid,
It is possible to perform a good sealing action to prevent leakage of liquid to the rotary shaft support for a long period of time, and the durability of the pump can be improved.

In addition, as the leaking low-lubricity liquid flows back to the low-pressure part side, foreign matter adhering to the filter member is washed away by the flow-back liquid, suppressing the deterioration of the filtration function, and simplifying the maintenance management of the filter member. It has the following features:

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG.
FIG. 2 is an enlarged sectional view of a main part, and FIG. 3 is a sectional view taken along line - in FIG. 1. 1...Pump body, 10...Liquid conveyance means, 2
4, 25... Bearing member, 26, 27... Sealing member, 31, 33... Storage chamber, 34, 35... Protection member, 36, 37... Filtering member, 42, 43...
liquid path.

Claims (1)

[Scope of utility model registration request] A liquid conveying means is housed in the pump body so that the low lubricity liquid is sucked in from the suction passage and discharged to the discharge passage by the rotational drive of the rotary shaft, and a bearing member is interposed in the bearing hole provided in the pump body. The outer periphery of the rotating shaft between the liquid conveying means and the bearing member is configured to rotatably support the rotating shaft, and to prevent the low-lubricity liquid leaking from the liquid conveying means from leaking along the outer periphery of the rotating shaft to the rotating shaft support. A sealing member is provided by press-contacting a liquid leakage-tight portion formed from an elastic material to the outer circumferential surface of the rotating shaft,
A filtration member is provided on the outer periphery of the rotating shaft between the sealing member and the liquid conveying means to clean low-lubricity liquid that leaks to the sealing member, and also leaks from the liquid conveying means and leaks to the filtration member along the outer periphery of the rotating shaft. A fluid pump comprising a liquid passage communicating with a low-pressure part between a liquid conveying means and a filter member so as to circulate a low-lubricity liquid to the low-pressure part.