JPS632036B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump that receives external pressure, such as a submersible pump.

For example, a submersible pump that operates in a high-pressure atmosphere underwater and has a structure in which oil is sealed in the crank chamber has a structure in which a compensator with a built-in bellofram or the like is installed to equalize the pressure in the crank chamber with the atmospheric pressure. Conventionally, the compensator is rigidly attached to the casing.

For such pumps, in order to replenish oil in the crank chamber, it is first necessary to install a hydraulic pump for replenishing lubricating oil near the submersible pump, or to move the submersible pump to a position near the hydraulic pump for replenishing lubricating oil. Either way, it's very troublesome.

The present invention was proposed in view of the above circumstances, and an object of the present invention is to provide a pump that receives external pressure and can easily attach and detach a compensator and replenish lubricating oil without causing water leakage or oil leakage during replacement. In a submerged pump having a crank chamber filled with lubricating oil, a compensator operates under external pressure to maintain the crank chamber at a pressure equal to or slightly higher than the external pressure and replenishes the crank chamber with lubricating oil. is detachably connected to the crank chamber via a joint, and check valves are inserted in the front and rear sides of the joint to close the communication portion only when the compensator is removed.

An embodiment in which the present invention is applied to a submersible pump will be explained with reference to the drawings. Fig. 1 is a cross-sectional view thereof, Fig. 2 is a longitudinal sectional view of Fig. 1, and Fig. 3 is a submersible pump of Fig. 1. FIG. 3 is a longitudinal cross-sectional view of a compensator removably fitted into the crankcase of the present invention.

In the above figure, 1 is a crankcase containing a crank chamber 1a filled with lubricating oil, 1c is a sliding part, 1d is a drain hole, and 2 and 3 are a crankshaft 4.
5 is a connecting rod, 6 is a cross rod, 7 is a piston, 8 is an end plate with suction valves and discharge valves (not shown), 9 is a packing, 10 and 11 are crank chambers. 1a
Seal ring for lubricating oil seal, 12 is a compensator case, 12a is a pressure equalization hole, 13 is a flange, 14 is a bellophram, 14a is a compensator chamber, 15 is an adapter, 16 is a spring, 17 is an O-ring, 18 is a nut, 19 is an axial projection 19
A is a check valve having a protruding ball, 20 is a spring, and 12 to 16 cooperate to form a compensator C.

In such a device, the compensator C
The structure is such that the container 12 and the flange 13 are tightened, and a spring 16 presses an internal bellofram 14 via an adapter 15. Therefore, the oil in the compensator chamber 14a has a pressure equal to the atmospheric pressure plus the force of the spring 16.

Therefore, even if this pump is installed underwater under high pressure, the pressure in the crank chamber 1a will always be the atmospheric pressure plus the force of the spring 16, and the crankcase 1 cannot be of a non-pressure resistant structure. can.

The flange 13a at the tip of the flange 13 is configured to sandwich a joint 1b provided on the crankcase 1 and an O-ring 17, and to be tightened with a nut 18. When the check valve 19, which has a protrusion 19a (not shown), is pressed against the valve seat 13b by the spring 20, and the check valve 19 is pressed against the valve seat 13b and maintains a seal, the protrusion 19a of the check valve 19 is pressed against the valve seat 13b. The tip is slightly protruded from the end surface of the collar 13a.

The side of the joint 1b provided in the crankcase 1 also has a check valve having substantially the same structure as the check valve 19 built in in the direction opposite to the check valve 19, and when the compensator C is removed, the compensator chamber 14a and the crank chamber 1a are connected to each other. The oil inside is sealed by check valves 19, 19, respectively, and the oil does not flow out.

When the compensator C is installed, the protrusions 19a of the check valve 19 provided on both mounting portions press against each other and an oil passage is created between the valve seat 13b and the compensator chamber 14a and the crank chamber 1.
A is a state of equal pressure.

In such a pump, the oil lubricating the inside of the crank chamber 1a is always maintained at a slightly higher pressure than the atmospheric pressure, so a small amount of oil may leak out from the sliding part 1C between the piston 7 and the crankcase 1. ,
Although the oil is discharged to the outside world from the drain hole 1d of the crankcase 1, the oil that leaks into the outside world little by little due to the operation of the pump is replenished by the compensator C, so that the oil in the compensator chamber 14a decreases.

Therefore, it is necessary to replenish the oil at appropriate intervals, but the compensator C can be easily removed, and while it is removed, the check valve 19 maintains the oil tightness between the compensator chamber 14a and the crank chamber 1a. Since it drips, there is no risk of oil leaking outside.

Conventionally, lubricating oil to the crank chamber 1a has been refilled by installing a replenishing hydraulic pump near the submersible pump, or by moving the submersible pump to the hydraulic pump and supplying the appropriate oil provided in the crankcase 1. However, in the present invention, it is sufficient to remove the compensator, fill it with oil, and install it.During this replacement, the oil in the crank chamber 1a and the compensator chamber 14a is maintained by the check valve 19. There is no external leakage, and workability is significantly improved.

Although the above embodiment has been described as being equipped with one compensator, it is also possible to provide two compensators so that while one compensator is being replaced, the other compensator replenishes oil in the crank chamber 1a. In addition, if the submersible pump is installed in a narrow place, the compensator can be connected to the crankcase 1 with a pipe or hose, and the compensator can be removed and installed in an easy location.
In this case, it goes without saying that check valves 19 are provided on both the hose or pipe joint and the compensator.

In short, according to the present invention, in a submerged pump having a crank chamber filled with lubricating oil, the pump operates under external pressure and maintains the crank chamber at a pressure equal to or slightly higher than the external pressure to lubricate the crank chamber. A compensator for replenishing oil is removably connected to the crank chamber via a joint, and check valves are inserted on the front and rear sides of the joint to close the communication section only when the compensator is removed. The present invention is extremely useful industrially because it provides a pump that receives external pressure and replenishes lubricating oil by easily attaching and detaching the compensator without causing water or oil leakage during replacement.

In the above explanation, we have described application examples of crank piston type submersible pumps, but axial plunger type submersible pumps are also applicable.
It goes without saying that the compensator provided for lubrication of the plunger drive section and pressure equalization of the casing can be applied in exactly the same manner as the present invention.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment in which the present invention is applied to a submersible pump, and FIG. 2 is a vertical cross-sectional view of FIG. 1.
FIG. 3 is an enlarged sectional view of the compensator shown in FIG. 1. 1...Crank case, 1a...Crank chamber, 1b
...Joint, 1c...Sliding part, 1d...Drain hole, 2, 3
...Bearing, 4...Crankshaft, 5...Connecting rod, 6...Cross rod, 7...Piston, 8...End plate, 9...Packing, 10, 11...Seal ring, 12...Compensator case, 12a
...Pressure equalization hole, 13...Flange, 13a...Brim, 13
b... Valve seat, 14... Verofram, 14a... Compensator chamber, 15... Adapter, 16... Spring,
17...O ring, 18...nut, 19...check valve, 19a...protrusion, C...compensator.

Claims (1)

[Claims] 1 In a submerged pump with lubricating oil sealed in the crank chamber, a compensator is provided that operates under external pressure and maintains the crank chamber at a pressure equal to or slightly higher than the external pressure and refills the crank chamber with lubricating oil. The device is removably connected to the crank chamber via a joint, and is subjected to external pressure by having check valves inserted in the front and rear sides of the joint that close the communication portion only when the compensator is removed. pump.