Plunger with anti-corrosion function for oil field

Abstract

The utility model discloses an oil field plunger with an anti-corrosion function, which comprises a plunger rod, a clamp spring and a plurality of sealing rings, a plunger head is assembled at one end of the plunger rod, the clamp spring and the sealing rings are sleeved on the plunger rod, a limit ring is integrally formed on the outer wall of the plunger rod, and a containing groove for containing the sealing rings is formed between the plunger head and the limit ring. The end, close to the limiting ring, of the plunger rod is a connecting end with taper, and an annular groove used for being connected with the clamping spring in a clamped mode is formed in the outer wall of the connecting end, so that when the plunger head is screwed to be assembled with the plunger rod, the clamping spring is matched with the taper section of the connecting end to gradually expand on the plunger rod till the clamping section is clamped with the annular groove, and limiting of the sealing ring is completed. The rubber ring is limited at the connecting end of the plunger head and the plunger rod through the matching of the connecting end with the taper and the clamping spring, and the problem that the sealing effect is affected due to the fact that the rubber ring is not compactly assembled due to thread sealant residues when the plunger head and the plunger rod are assembled at present is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, in particular to a plunger with an anti-corrosion function for oil fields. Background Art

[0002] At present, plunger pumps are mostly used to transport fluids in oilfield operations. The inlet pipeline valve is closed and the outlet pipeline valve is opened. The fluid in the cylinder is pressed and sent out from the outlet pipeline. The plunger moves back and forth continuously in the cylinder, and the fluid is continuously transported to the target mechanism.

[0003] Conventionally, multiple sealing rings are installed at the connection between the plunger head and the plunger rod, and thread sealant is applied to the threaded connection between the plunger head and the plunger rod to improve the sealing effect between the plunger head and the plunger rod. The thread sealant can solidify between two tightly fitting metal surfaces under air-isolated conditions, thereby preventing the threaded fasteners from loosening and leaking due to vibration. However, when the sealing ring ages and needs to be replaced, the residual glue remaining in the thread will affect the subsequent installation of the plunger head. Therefore, it is difficult to ensure that the new sealing rings are installed compactly, which may affect the sealing effect of the plunger head. Utility Model Content

[0004] The purpose of the utility model is to provide a plunger with anti-corrosion function for oil fields, so as to solve the problem in the above background technology that the conventional plunger head is easily affected by residual glue during maintenance and assembly to prevent the sealing ring from being installed compactly.

[0005] To achieve the above object, the present invention provides the following technical solution: a plunger with an anti-corrosion function for use in oil fields, comprising a plunger rod with a plunger head mounted on one end, and a retaining spring and a plurality of sealing rings sleeved on the plunger rod;

[0006] A limiting ring is integrally formed on the outer wall of the plunger rod, and a receiving groove for accommodating the sealing ring is formed between the plunger head and the limiting ring. The end of the plunger rod approaching the limiting ring is a tapered connecting end, and an annular groove for clamping the retaining spring is provided on the outer wall at the connecting end, so that when the plunger head and the plunger rod are assembled, the tapered section of the retaining spring matching the connecting end gradually expands on the plunger rod until it is clamped with the annular groove and completes the limitation of the sealing ring.

[0007] Preferably, one end of the plunger rod is provided with a mounting groove for installing the plunger head, the inner wall of the mounting groove is provided with a thread, a screw is fixedly installed on one side of the plunger head, and the plunger head is fastened to the end of the plunger rod through a threaded connection between the screw and the mounting groove.

[0008] Preferably, the plunger rod is provided with a thread between the tapered section from the annular groove to the connecting end, and the inner wall of the plunger head is threadedly connected to the outer wall of the plunger rod.

[0009] Preferably, through holes are respectively formed at both ends of the clamping spring.

[0010] Preferably, one side of the sealing ring is configured as an arc structure, and the other side is configured as a plane structure.

[0011] Preferably, the edges and corners of the connecting ends are chamfered.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model limits the rubber ring by cooperating with the retaining spring at the connecting end of the plunger head and the plunger rod through the tapered connecting end, thereby solving the problem that the rubber ring is not assembled compactly enough and the sealing effect is affected due to the residual thread sealant during the assembly of the plunger head and the plunger rod. The utility model has a simple structure and is easy to operate, which effectively brings convenience to the assembly of the plunger. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the split three-dimensional structure of the plunger head and plunger rod of the utility model;

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the plunger head and plunger rod assembly of the utility model.

[0017] In the figure: 1. Plunger rod; 2. Plunger head; 3. Limiting ring; 4. Sealing ring; 5. Screw; 6. Circlip; 7. Through hole; 8. Connecting end; 9. Annular groove. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 3The utility model provides a technical solution: a plunger with anti-corrosion function for oil fields, comprising a plunger rod 1 with a plunger head 2 assembled at one end. The present application is applied to plunger pumps for oil field operations. The plunger rod 1 and the plunger head 2 are both made of stainless steel and have certain anti-corrosion performance. One end of the plunger rod 1 is provided with a mounting groove for the plunger head 2 to be installed. The inner wall of the mounting groove is provided with a thread. A screw rod 5 is fixedly installed on one side of the plunger head 2. The plunger head 2 is fastened to the end of the plunger rod 1 through the screw rod 5 and the mounting groove thread connection. It also includes a retaining spring 6 and a plurality of sealing rings 4 sleeved on the plunger rod 1. One side of the sealing ring 4 is set as an arc structure, and the other side is provided with a screw rod 5. The side is a planar structure. The advantage of this arrangement is that the installation is more compact after multiple sealing rings 4 are compressed. The sealing ring 4 is made of two materials: polymer material and cowhide. A limiting ring 3 is integrally formed on the outer wall of the plunger rod 1. A accommodating groove for accommodating the sealing ring 4 is formed between the plunger head 2 and the limiting ring 3. The end of the plunger rod 1 approaching the limiting ring 3 is a tapered connecting end 8, and the corners of the connecting end 8 are chamfered. The purpose of this arrangement is to disperse the stress on the edge of the connecting end 8 to the inclined surface when the driving motor of the plunger pump converts the rotary motion into the forward and backward motion of the plunger, thereby reducing the stress at the end of the plunger rod 1 and improving the stability of the plunger rod. 1 has excellent fatigue resistance. An annular groove 9 for clamping the circlip 6 is provided on the outer wall at the connection end 8. Through holes 7 are respectively provided at both ends of the circlip 6. The advantage of this arrangement is that when maintaining or replacing the rubber ring 4, the user can insert the pointed mouth of the circlip pliers into the through hole 7 to open the circlip 6 and disengage it from the annular groove 9. When assembling the rubber ring 4, first, several rubber rings 4 and the circlip 6 are sequentially sleeved on the plunger rod 1 from the connection end 8. The plunger rod 1 is provided with a thread between the annular groove 9 and the tapered section of the connection end 8. The inner wall of the plunger head 2 is threadedly connected to the outer wall of the plunger rod 1. Before screwing the plunger head 2, the plunger can be tightened at the thread. Applying thread sealant can prevent loosening or leakage caused by vibration or impact, and then screwing the plunger head 2 and the plunger rod 1 for assembly. The retaining spring 6 cooperates with the tapered section of the connecting end 8 to gradually expand on the plunger rod 1 until it engages with the annular groove 9 and completes the limitation of the sealing ring 4. The present application completes the limitation of the rubber ring 4 by cooperating with the tapered connecting end 8 and the retaining spring 6 at the connecting end of the plunger head 2 and the plunger rod 1, solving the current problem that the rubber ring 4 is not assembled compactly enough and affects the sealing effect due to the residual thread sealant during assembly of the plunger head 2 and the plunger rod 1. The present application has a simple structure and is easy to operate, which effectively brings convenience to the plunger assembly.

[0020] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0021] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plunger with anti-corrosion function for oil fields, characterized by: It comprises a plunger rod (1) with a plunger head (2) mounted on one end, and also comprises a retaining spring (6) and a plurality of sealing rings (4) sleeved on the plunger rod (1); A limiting ring (3) is integrally formed on the outer wall of the plunger rod (1), and a receiving groove for accommodating the sealing ring (4) is formed between the plunger head (2) and the limiting ring (3). The end of the plunger rod (1) approaching the limiting ring (3) is a tapered connecting end (8), and an annular groove (9) for clamping the retaining spring (6) is provided on the outer wall at the position of the connecting end (8), so that when the plunger head (2) and the plunger rod (1) are screwed together, the tapered section of the retaining spring (6) that cooperates with the connecting end (8) gradually expands on the plunger rod (1) until it is clamped with the annular groove (9) and completes the limiting of the sealing ring (4).

2. The plunger with anti-corrosion function for oil fields according to claim 1, characterized in that: One end of the plunger rod (1) is provided with a mounting groove for mounting the plunger head (2), the inner wall of the mounting groove is provided with a thread, a screw rod (5) is fixedly mounted on one side of the plunger head (2), and the plunger head (2) is fastened to the end of the plunger rod (1) through the screw rod (5) and the mounting groove threaded connection.

3. The plunger with anti-corrosion function for oil fields according to claim 1, characterized in that: The plunger rod (1) is provided with a thread between the tapered section from the annular groove (9) to the connecting end (8), and the inner wall of the plunger head (2) is threadedly connected to the outer wall of the plunger rod (1).

4. The plunger with anti-corrosion function for oil fields according to claim 1, characterized in that: Through holes (7) are respectively formed at both ends of the clamping spring (6).

5. The plunger with anti-corrosion function for oil fields according to claim 1, characterized in that: One side of the sealing ring (4) is configured as an arc-shaped structure, and the other side is configured as a plane structure.

6. The anti-corrosion plunger for oil fields according to claim 1, characterized in that: The corners of the connecting end (8) are all chamfered.

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