CN103477027A - Reverse rotation protection for borehole pumps - Google Patents

Abstract

The invention relates to a reverse rotation protection for borehole pumps, said reverse rotation protection being mounted in a drive head. The reverse rotation protection comprises a housing and a clamping tool for securing a polished rod. The clamping tool comprises at least two exchangeable contact elements which detachably fix the polished rod.

Description

Reverse rotation protection for borehole pump

Technical field

The present invention relates to the reverse rotation protection for borehole pump.

Background technology

Canadian Patent CA2331915C discloses for linkage being fixed and is held in a kind of apparatus and method in drilling well.This Plant arrangement is in the below in skirt section and the top of drilling well.Four holding elements for linkage are arranged to be offset 90 °, thereby make each holding element keep linkage from a side.Each holding element comprises jaw and screw, and jaw presses linkage by screw.When the contiguous linkage of jaw location, there is gap in each case between each jaw.

Canadian Patent CA2349988C has described for polished rod being kept and being fixed in a kind of device in oil transfer pump.This device is attached in the transmission system of crude oil pump, and is connected to latter's (being the transmission system of crude oil pump) by two flanges.For fixing polished rod, two jaws press polished rod by bolt.Under normal unclamped state, jaw remains apart and presses the inwall of this device by spring.For guiding the sleeve of polished rod to be inserted in the lower area of this device.

Summary of the invention

The root problem that the present invention will solve is that a kind of reverse rotation protection will be provided, and the transmission system of borehole pump can be guaranteed to prevent from rotatablely moving when the inoperation by this reverse rotation protection.

The problems referred to above solve by the reverse rotation protection that comprises the described feature of claim 1.Other advantageous embodiment can limit in the feature of dependent claims.

Disclose a kind of reverse rotation protection for borehole pump, wherein reverse rotation protection according to the present invention is arranged in driving head.Reverse rotation protection comprises housing and for the fixing clamping tool of polished rod.Clamping tool comprises at least two interconvertible contact elements, and polished rod is by described contact element fixing polished rod releasedly.

Contact element releasably is encased in clamping device respectively.Each contact element is connected to described clamping device by least one screw.Contact element is by not producing spark and withstand voltage material is made.Contact element is preferably become by bronze, brass or copper.

Clamping tool can be different by size contact element be applicable to have the different polished rods of different-diameter.Contact element with different inner diameters can be inserted in the clamping device of clamping tool, therefore can select different contact elements according to the diameter of various polished rods.For what it will be apparent to those skilled in that, be that this clamping tool can be applicable to by different contact elements the polished rod that its diameter has changed in the operating process of borehole pump.

The side that clamping device is relative with contact element is provided with for receiving the groove of dog screw.Clamping device can move by dog screw in housing.Each dog screw is provided with cover cap deviating from a side of clamping device.When contact element does not contact with polished rod, cover cap is mounted on dog screw.Therefore can find out that borehole pump has been ready to start.When contact element contacts with polished rod, dog screw is screwed into certain degree in the housing of reverse rotation protection so that cover cap can not be assembled on dog screw.Another advantage of this method is that the screw thread of dog screw is subject to the protection of cover cap in order to prevent from being subject in the normal operation period dust and boisterous impact.

In a particular embodiment, cover cap is provided with contact, and described contact can be indicated the relaxed state of reverse rotation protection.In addition, cover cap contacts with controller by connecting cable respectively, and described controller prevents in the situation that do not have signal to start borehole pump.Therefore, this can guarantee to only have and discharges and latter's (being polished rod) just can start borehole pump while not being subject to hindering from polished rod when contact element.

In addition, various process steps all play very important effect, thereby prevent borehole pump from being counter-rotated and the rotation that causes transmission system not expected.Contact element presses polished rod, keeps in touch polished rod, and removes from polished rod by actuating unit.In a preferred embodiment, dog screw or hydraulic actuation element are as actuating unit.When contact element removes from polished rod, contact closure, it discharges the startup of borehole pump.

When using dog screw, by the contact be arranged in cover cap, caused discharging, contact element after removing, polished rod is being screwed to cover cap dog screw.In the situation that the hydraulic actuation element, this task can be carried out by magnetic switch, and magnetic switch moves by hydraulic cylinder.

The accompanying drawing explanation

Below by accompanying drawing, at length explain example and the advantage thereof of the embodiment of the present invention.In dimension scale each other, not always corresponding to actual dimension scale, its reason is that certain structures presents in a simplified manner to each elements relative in the accompanying drawings, and other structure can be exaggerated with respect to other element for the purpose of more clear.

Fig. 1 illustrates the position of reverse rotation protection in driving head.

Fig. 2 at length illustrates according to reverse rotation protection of the present invention.

Fig. 3 illustrates the phantom drawing of reverse rotation protection.

Fig. 4 illustrates the reverse rotation protection with electric start protective device.

Fig. 5 at length illustrates the protection system of reverse rotation protection.

The specific embodiment

Fig. 1 illustrates the position ofreverse rotation protection 20 in driving head 10.Reverse rotation protection 20 is arranged in the upper area in skirt section 14.Polishedrod 12 extends throughreverse rotation protection 20 and passes through driving head 10.Motor 18 is installed ondriving head 10 bycarriage 16.

Fig. 2 at length illustrates according toreverse rotation protection 20 of the present invention.Reverse rotation protection 20 comprises housing 22.Be positioned at the inside ofhousing 22 for thefixing clamping tool 24 of polished rod 12.In embodiment shown here,clamping tool 24 comprises twoclamping devices 28, andcontact element 26 is encased in clampingdevice.Contact element 26 represents the connection betweenreverse rotation protection 20 and polished rod 12.Contact element 26 is releasably connected toclamping device 28 by screw 30.Groove 32 is arranged on the both sides thatclamping device 28 is relative withcontact element 26, anddog screw 34 is engaged in thisgroove.Contact element 26 presses polishedrod 12 by thesedog screws 34 or discharges from latter's (being polished rod).Cover cap 36 is arranged at the place, outer end of dog screw 34.Whencontact element 26 asdog screw 34 released result and while no longer contacting with polishedrod 12, thesecover caps 36 are assembled ondog screw 34.

Fig. 3 illustrates the phantom drawing of reverse rotation protection 20.Clamping device 28 is loaded in housing 22.Contact element 26 can be seen in inside atclamping device 28, and it releasably is fixed inclamping device 28 by screw 30.In addition, can see that the dog screw (not shown) is engaged ingroove 32 wherein.Can see the outside ofcover cap 36 inhousing 22, atcontact element 26, after the polished rod (not shown) removes, described cover cap covers dog screw 34.Cover cap 36 is connected tohousing 22 by holdingelement 37 in the mode that cover cap can not be lost when not using.

Fig. 4 shows thereverse rotation protection 20 with electric start protective device.In this example of embodiment,cover cap 36 is provided withcontact 38, and it is connected tocontroller 40 by connecting cable 42.In this example of embodiment,controller 40 also is mounted on thehousing 22 ofreverse rotation protection 20 ascover cap 36.

Fig. 5 at length shows the protection system according toreverse rotation protection 20 of the presentinvention.Dog screw 34 laterally is arranged in thehousing 22 of reverse rotation protection 20.The position ofclamping device 28 and thus the position ofcontact element 26 by thesedog screws 34, change.Whencontact element 26 removes from the polished rod (not shown), the outstanding housing parts that surpasses of dog screw 34.Ifcover cap 36 is screwed ondog screw 34, between the head ofdog screw 34 and contact 38, forms and connect.Circuit connects closed by this, this makes the driver that can start borehole pump.

With reference to preferred embodiment, invention has been described.

Description of reference numerals:

10 driving heads

12 polished rods

14 skirt sections

16 carriages

18 motors

20 reverse rotation protections

22 housings

24 clamping tools

26 contact elements

28 clamping devices

30 screws

32 grooves

34 dog screws

36 cover caps

37 holding elements

38 contacts

40 controllers

42 connect cable

Claims (11)

1. for the reverse rotation protection (20) of borehole pump; wherein reverse rotation protection (20) is arranged in driving head (10); wherein reverse rotation protection (20) comprises housing (22) and for the fixing clamping tool (24) of polished rod (12); it is characterized in that; described clamping tool (24) comprises at least two interconvertible contact elements (26), and polished rod is by described contact element (26) fixing polished rod (12) releasedly.

2. reverse rotation protection according to claim 1 (20), is characterized in that, described contact element (26) releasably is encased in respectively in clamping device (28).

3. according to the described reverse rotation protection of any one in claim 1 or 2 (20), it is characterized in that, each contact element (26) is connected to described clamping device (28) by least one screw (30).

4. reverse rotation protection according to claim 3 (20), is characterized in that, described contact element (26) is by not producing spark and withstand voltage material is made.

5. according to the described reverse rotation protection of any one in claim 1 to 4 (20), it is characterized in that, the contact element (26) that described clamping tool (24) can be different by size is applicable to the diameter of different bars (12).

6. according to the described reverse rotation protection of any one in claim 1 to 5 (20); it is characterized in that, described clamping device (28) is provided with the groove (32) for receiving dog screw (34) on a side relative with contact element (26).

7. reverse rotation protection according to claim 6 (20), is characterized in that, by dog screw (34), can in housing (22), move described clamping device (28).

8. according to the described reverse rotation protection of any one in claim 1 to 7 (20), it is characterized in that, each dog screw (34) is provided with cover cap (36) on a side that deviates from clamping device (28).

9. reverse rotation protection according to claim 8 (20), is characterized in that, when contact element (26), not with polished rod (12) while contacting, cover cap (36) is mounted on dog screw (34).

10. the described reverse rotation protection of any one (20) according to Claim 8 or 9, is characterized in that, described cover cap (36) is provided with contact (38), and described contact can be indicated the relaxed state of reverse rotation protection (20).

11. the described reverse rotation protection of any one (20) according to Claim 8 to 10; it is characterized in that; described cover cap (36) contacts with controller (40) by connecting cable (42) respectively, and described controller (40) prevents in the situation that do not have signal to start borehole pump.

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