Plunger pump
By designing the reciprocating movement of the guide slider and plunger in the plunger pump, and using the flow gap to balance the chamber pressure, the problems of large wear and short service life of the plunger pump are solved, extending service life and simplifying the structure.
Patent Information
- Application Number
- CN202311600047.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-28
- Publication Date
- 2025-05-30
AI Technical Summary
The plunger pump has a large wear, a short service life, and the length of the liquid suction port is relatively short and is easily blocked by impurities.
A plunger pump is designed, including an outer pipe, a fixed valve, a sealing plug, a guide slider, a swimming valve, a plunger, a top pipe and a linear motor. By reciprocating movement of the guide slider and the plunger, the chamber pressure is balanced using the flow gap, the contact wear between the plunger and the outer tube wall is reduced, and the plunger is directly driven by a linear motor, simplifying the structure.
It extends the service life of the plunger pump, reduces contact wear of the plunger, simplifies the structure, and balances the chamber pressure through the flow gap, improving the smoothness of the pump's movement.
Smart Images
Figure CN120062093A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of plunger pumps, and particularly relates to a plunger pump. Background Art
[0002] A plunger pump is an oil and gas resource extraction device, which consists of a pump barrel and a long plunger, and is equipped with a linear motor to drive the long plunger to move, so as to achieve pumping and draining liquid.
[0003] However, the sealed liquid drainage of the long plunger cooperating with the long pump barrel also makes the contact wear stroke and wear degree between the plunger and the pump barrel relatively large to a certain extent, resulting in a short service life. On the other hand, limited by the structural specifications and installation distance between the plunger pump and the linear motor, the length of the liquid suction port of the plunger pump is short and is easily blocked by impurities such as downhole sediment. Summary of the Invention
[0004] This application provides a plunger pump, aiming to at least solve the technical problems of large wear amount and short service life of the plunger pump to a certain extent. For this purpose,
[0005] A plunger pump provided by an embodiment of this application includes: an outer tube, a fixed valve, a sealing plug, a guiding slider, a floating valve, a plunger, a top tube, and a linear motor;
[0006] The fixed valve is arranged at one end of the outer tube, and the sealing plug is arranged at the other end of the outer tube;
[0007] The guiding slider is slidably arranged in the outer tube, and a flow gap communicating with the tube cavities on both sides of the guiding slider is arranged on the guiding slider;
[0008] The floating valve is arranged on the guiding slider, the plunger is connected to the guiding slider, a plunger flow channel arranged in the plunger is communicated with the liquid inlet port of the floating valve, the liquid outlet port of the floating valve and the plunger are respectively located on both sides of the guiding slider, and a gap is left between the plunger and the inner wall of the outer tube;
[0009] The top tube is slidably inserted into the sealing plug, the top tube is connected to the plunger, and a top tube flow channel in the top tube is communicated with the plunger flow channel. The second end of the top tube is provided with a liquid inlet;
[0010] The linear motor is connected to the top tube to drive the top tube to reciprocate axially.
[0011] In some embodiments, the plunger pump further includes a screen pipe, both ends of the screen pipe are respectively connected to the outer tube and the housing of the linear motor, and the top tube is arranged in the screen pipe to filter the fluid entering the liquid inlet.
[0012] In some embodiments, a filter screen is wound around the second end of the jacking pipe, and the filter screen covers the liquid inlet to filter the fluid entering the liquid inlet.
[0013] In some embodiments, the outer pipe and the housing of the linear motor are connected by fasteners.
[0014] In some embodiments, through holes are formed in the guiding slider, and the through holes are arranged along the moving direction of the guiding slider.
[0015] In some embodiments, a concave notch is formed on the circumferential surface of the guiding slider.
[0016] In some embodiments, the fixed valve includes a fixed ball valve.
[0017] In some embodiments, the sealing plug is an annular member, and the jacking pipe is inserted into the central hole of the sealing plug and maintains a sliding seal.
[0018] In some embodiments, the diameter of the jacking pipe is smaller than the diameter of the plunger, and the diameter of the plunger is smaller than the diameter of the guiding slider.
[0019] In some embodiments, the cross sections of the outer pipe, the plunger and the jacking pipe are circular.
[0020] The embodiments of the present application at least have the following beneficial effects:
[0021] The plunger pump provided by the embodiments of the present application is provided with a fixed valve and a sealing plug at both ends of the outer pipe to form an openable sealed cylinder body; a guiding slider is arranged inside the outer pipe, and a floating valve and a plunger are arranged on the guiding slider, and the plunger is connected to the linear motor through a jacking pipe, so that the plunger moves stably back and forth under the drive of the linear motor, and thus, through the reciprocating movement of the guiding slider and the plunger, the fluid pressure in the pipe cavity is changed, so as to pump out the fluid through the fixed valve, or suck in the fluid through the floating valve, the plunger and the jacking pipe; and a flow gap communicating the two chambers on both sides of the guiding slider is arranged on the guiding slider to balance the pressures of the two chambers by fluid flow and reduce the influence of too large pressure difference on the smooth movement of the plunger. Among them, a gap is left between the plunger and the outer pipe wall, which reduces the contact wear of the plunger to a certain extent and prolongs the service life; on the other hand, the linear motor directly drives the plunger through the jacking pipe, so that the suction structure and the pump rod are integrated, and an independent pump barrel and pump rod do not need to be arranged, which simplifies the overall structure to a certain extent. Description of the Drawings
[0022] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.
[0023] Figure 1 It shows a schematic structural diagram of a plunger pump in an embodiment of the present application;
[0024] Figure 2 It shows Figure 1 a partial enlarged view I of the plunger pump in
[0025] Figure 3 It shows Figure 1 a schematic diagram of the upward state of the plunger of the plunger pump in
[0026] Figure 4 It shows Figure 1 a schematic diagram of the downward state of the plunger of the plunger pump in
[0027] Reference numerals:
[0028] 100 - outer tube, 110 - tubing connection part, 120 - upper oil chamber, 130 - lower oil chamber, 140 - lower end of the outer tube;
[0029] 200 - fixed valve;
[0030] 300 - sealing plug;
[0031] 400 - guiding slider, 410 - flow gap;
[0032] 500 - floating valve;
[0033] 600 - plunger, 610 - plunger flow channel;
[0034] 700 - jacking pipe, 710 - jacking pipe flow channel, 720 - liquid inlet, 730 - connecting block;
[0035] 800 - linear motor;
[0036] 900 - screen pipe. Specific embodiments
[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0038] In addition, this application may repeat reference numerals and / or reference letters in different instances. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.
[0039] The present application will be described below with reference to the accompanying drawings and specific embodiments:
[0040] A plunger pump generally consists of a pump barrel and a long plunger, and is configured with a linear motor to drive the long plunger to move to achieve pumping and liquid discharge. However, the sealed liquid discharge of the long plunger cooperating with the long pump barrel also causes a relatively large contact wear stroke and wear degree between the plunger and the pump barrel to a certain extent, resulting in a short service life. On the other hand, limited by the structural specifications and installation distance between the plunger pump and the linear motor, the suction port length of the plunger pump is short and is easily blocked by impurities such as underground sediment.
[0041] For this reason, a plunger pump provided in an embodiment of the present application aims to improve the wear degree of the plunger to a certain extent and extend the service life.
[0042] See Figure 1 and Figure 2 , in some embodiments, the plunger pump may include: an outer tube 100, a fixed valve 200, a sealing plug 300, a guiding slider 400, a floating valve 500, a plunger 600, a top tube 700, and a linear motor 800.
[0043] The fixed valve 200 and the sealing plug 300 are respectively arranged at both ends of the outer tube 100 to form an openable sealed cylinder.
[0044] The guiding slider 400 is slidably arranged inside the outer tube 100. The plunger 600 is connected to the guiding slider 400, dividing the lumen of the outer tube 100 into an upper oil chamber 120 and a lower oil chamber 130. Under the guidance of the guiding slider 400, the plunger 600 can stably reciprocate inside the outer tube 100 along a stable track, thereby adjusting the spatial sizes of the upper oil chamber 120 and the lower oil chamber 130, and then generating pressure changes; that is, when the space increases, the pressure decreases, and relatively, when the space decreases, the pressure increases. Specifically, when the guiding slider 400 moves upward to compress the fluid in the upper oil chamber 120, the pressure increases and is greater than the pressure on the side where the oil pipe connection part 110 of the outer tube 100 is located, so that the fixed valve 200 is opened, thereby pumping out the fluid, such as oil. Wherein, a communication gap 410 for communicating the upper oil chamber 120 and the lower oil chamber 130 can be arranged on the guiding slider 400, which can realize the adaptive circulation of the oil, balance the pressures of the two chambers to a certain extent, avoid excessive moving resistance formed when the chamber space changes, and improve the smoothness of the movement of the guiding slider 400 and the plunger 600.
[0045] Correspondingly, the floating valve 500 can be arranged on the guiding slider 400. The liquid outlet port of the floating valve 500 can be communicated with the upper oil chamber 120. The liquid inlet port of the floating valve 500 can be sequentially communicated with a plunger flow channel 610 arranged inside the plunger 600 and a top pipe flow channel 710 inside the top pipe 700. The other port of the top pipe 700 is arranged below the liquid level. Thus, during the reciprocating movement of the floating valve 500 following the plunger 600, when the hydraulic pressure in the upper oil chamber 120 is less than the hydraulic pressure in the plunger flow channel 610, that is, a relative negative pressure is formed in the upper oil chamber 120, the floating valve 500 is opened in a timely manner, and the fluid is inhaled through the plunger flow channel 610 and the top pipe flow channel 710 and enters the upper oil chamber 120.
[0046] Among them, the pipe body of the jacking pipe 700 is slidably inserted into the sealing plug 300 to achieve sliding sealing; and the first end of the jacking pipe 700 is connected to the plunger 600, and the liquid inlet 720 opened at the second end of the jacking pipe 700, as the area for sucking fluid, is stably arranged below the liquid level. The linear motor 800 serves as a driving member, and the mover of the linear motor 800 is connected to the jacking pipe 700 to drive the jacking pipe 700, as well as the connected plunger 600 and the guiding slider 400 to reciprocate along the axial direction of the jacking pipe 700. That is, by directly connecting the jacking pipe 700 to the linear motor 800 and pushing and pulling the jacking pipe 700 by the linear motor 800, the reciprocating movement of the plunger 600 and the guiding slider 400 is realized, so that there is no need to set up an independent pump barrel and pump rod to drive the plunger, which can simplify the structure and reduce the overall size to a certain extent.
[0047] On the other hand, the diameter of the plunger 600 can be slightly smaller than the inner diameter of the outer pipe 100, so as to maintain the gap between the plunger 600 and the inner wall of the outer pipe 100, facilitating the fluid movement between the upper oil chamber 120 and the lower oil chamber 130. And, since the plunger 600 does not make sealed contact with the inner wall of the outer pipe 100, the suction and pumping of fluid can be realized, so that the sliding wear between the plunger 600 and the outer pipe 100 can be greatly reduced, and the service life can be extended.
[0048] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , taking the vertical arrangement of the outer pipe 100 as an example to illustrate the working process of the above plunger pump.
[0049] When the linear motor 800 drives the jacking pipe 700 to move upward, the plunger 600 moves upward with it, compressing the space of the upper oil chamber 120. At this time, the fluid pressure in the upper oil chamber 120 is greater than the fluid pressure in the plunger flow channel 610 and the oil pipe connected above; at this time, the floating valve 500 in the guiding slider 400 is in a closed state under the pressure of the liquid in the upper oil chamber 120 and the plunger 600, and the fixed valve 200 is in an open state under the pressure between the upper oil chamber 120 and the upper oil pipe; correspondingly, a part of the fluid in the upper oil chamber 120 is pumped out through the fixed valve 200 and discharged outward through the upper oil pipe, and another part of the fluid flows into the annular space formed by the guiding slider 400, the plunger 600, the sealing plug 300 and the inner wall of the outer pipe 100, that is, into the lower oil chamber 130, through the flow gap 410.
[0050] When the linear motor 800 drives the pipe jacking 700 to move downward, the plunger 600 moves downward with it. The space of the upper oil chamber 120 increases, and the internal pressure decreases. The hydraulic pressure at the liquid outlet port of the floating valve 500 is less than that at its liquid outlet port. The hydraulic pressure at the port of the fixed valve 200 on the side of the upper oil chamber 120 is less than that at the other port, that is, a relative negative pressure is formed on the side of the upper oil chamber 120. At this time, the floating valve 500 is in an open state under the action of the liquid pressure in the upper oil chamber 120 and the plunger flow channel 610, and the fixed valve 200 is in a closed state under the action of the pressure between the upper oil chamber 120 and the upper oil pipe. Correspondingly, the bottom hole fluid flows into the upper oil chamber 120 through the liquid inlet 720, the ejector rod flow channel 710, the plunger flow channel 610 and the floating valve 500 under the action of the relative negative pressure formed on the side of the upper oil chamber 120, realizing fluid suction. During the process, the volume of the annular space formed by the guide slider 400, the plunger 600, the sealing plug 300 and the outer pipe 100, that is, the lower oil chamber 130, decreases, and part of the liquid in its space will also flow into the upper oil chamber 120 through the flow gap 410.
[0051] In some embodiments, considering the complex composition of downhole liquids, there are impurities and debris, which are likely to enter the ejector rod 700 along with the fluid and block the liquid inlet 720. For this reason, the plunger pump may further include a screen pipe 900. The two ends of the screen pipe 900 are respectively connected to the outer pipe 100 and the housing of the linear motor 800, so as to surround the pipe jacking 700 in the screen pipe 900, forming a filter cover around the liquid inlet 720 to filter the fluid entering the liquid inlet 720.
[0052] It should be noted that since the pipe jacking 700 needs a certain reciprocating movement length, the screen pipe 900 also has a certain length. Relatively, filtration can be realized in a certain length area around the liquid inlet 720, that is, an equivalent fluid inlet with a certain length is formed. Thus, even if the holes of the screen pipe 900 are blocked by debris, the influence on the liquid inlet efficiency of the liquid inlet 720 is relatively small, which helps to improve the liquid inlet efficiency.
[0053] In some embodiments, a filter screen can also be directly wound around the second end of the pipe jacking 700, that is, the area where the liquid inlet 720 is located, so as to cover the liquid inlet 720 through the winding of the filter screen to filter the fluid entering the liquid inlet 720.
[0054] In some embodiments, considering the stability requirement of the pushing and pulling force of the linear motor 800, the outer tube 100 and the housing of the linear motor 800 can be connected by fasteners to keep the outer tube 100 and the linear motor 800 connected as a whole and maintain the stability of the pushing and pulling movement stroke of the ejector rod 700 and the linear motor 800.
[0055] In some embodiments, the flow gap 410 can be set as a through hole opened on the guiding slider, and the through hole is arranged along the moving direction of the guiding slider 400.
[0056] In some embodiments, a concave notch can also be opened on the circumferential surface of the guiding slider 400 to form the flow gap 410.
[0057] In some embodiments, the fixed valve 200 includes a fixed ball valve for connecting the outer tube 100 and the upper oil pipe and can be adaptively opened and closed by the hydraulic pressure on both sides. For example, in the embodiments of the present application, it can be opened when the pressure in the upper oil cavity 120 is greater than the pressure on the upper oil pipe side to facilitate pumping out the oil.
[0058] In some embodiments, the sealing plug 300 can be set as an annular part, and the ejector pipe 700 is arranged in the central hole of the sealing plug and maintains a sliding seal.
[0059] Generally, an annular sealing line can be arranged on the contact surface between the sealing plug 300 and the ejector pipe 700.
[0060] In some embodiments, in order to improve the fluidity of fluid movement, the diameter of the ejector pipe 700 can be smaller than the diameter of the plunger 600, and the diameter of the plunger 600 is smaller than the diameter of the guiding slider 400.
[0061] In some embodiments, the cross sections of the outer tube 100, the plunger 600, and the ejector pipe 700 are circular.
[0062] In some embodiments, in order to facilitate the pushing and pulling force application and fixing stability of the ejector pipe 700, a connecting block 730 can be arranged at the end of the ejector pipe 700 and connected to the mover of the linear motor 800.
[0063] The embodiments of the present application at least have the following beneficial effects:
[0064] The plunger pump provided by the embodiment of the present application is provided with a fixed valve and a sealing plug at both ends of the outer tube to form an openable sealed cylinder body; a guiding slider is arranged inside the outer tube, and a floating valve and a plunger are arranged on the guiding slider, and the plunger is connected to a linear motor through a top pipe, so that the plunger can stably reciprocate under the drive of the linear motor. Thus, through the reciprocating movement of the guiding slider and the plunger, the fluid pressure in the tube cavity is changed, so as to pump out the fluid through the fixed valve, or suck in the fluid through the floating valve, the plunger and the top pipe; and a flow gap communicating the chambers on both sides of the guiding slider is arranged on the guiding slider to balance the pressures of the chambers on both sides by fluid flow and reduce the influence of excessive pressure difference on the smooth movement of the plunger. Wherein, a gap is left between the plunger and the outer tube wall, which reduces the contact wear of the plunger to a certain extent and prolongs the service life; on the other hand, the linear motor directly drives the plunger through the top pipe, thereby integrating the suction structure and the pump rod, and eliminating the need to provide an independent pump barrel and pump rod, which simplifies the overall structure to a certain extent.
[0065] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.
[0066] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.
[0067] It should be noted that all the directional indications in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0068] In this application, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0069] In addition, in this application, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "a plurality" means two or more, unless otherwise clearly and specifically defined.
[0070] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.
[0071] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0072] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of this application. The scope of this application is defined by the claims and their equivalents.
Claims
1. A plunger pump, characterized in that, it comprises: an outer tube, a fixed valve, a sealing plug, a guiding slider, a floating valve, a plunger, a top tube and a linear motor; the fixed valve is arranged at one end of the outer tube, and the sealing plug is arranged at the other end of the outer tube; the guiding slider is slidably arranged in the outer tube, and a flow gap communicating with the tube cavities on both sides of the guiding slider is arranged on the guiding slider; the floating valve is arranged on the guiding slider, the plunger is connected to the guiding slider, a plunger flow channel arranged in the plunger is communicated with the liquid inlet port of the floating valve, the liquid outlet port of the floating valve and the plunger are respectively located on both sides of the guiding slider, and a gap is left between the plunger and the inner wall of the outer tube; the top tube is slidably arranged in the sealing plug, the top tube is connected to the plunger, and a top tube flow channel in the top tube is communicated with the plunger flow channel, and a liquid inlet is arranged at the second end of the top tube; the linear motor is connected to the top tube to drive the top tube to reciprocate axially.
2. The plunger pump according to claim 1, characterized in that, the plunger pump further comprises a screen pipe, both ends of the screen pipe are respectively connected to the outer tube and the housing of the linear motor, and the top tube is arranged in the screen pipe to filter the fluid entering the liquid inlet.
3. The plunger pump according to claim 1, characterized in that, a filter screen is wound around the second end of the top tube, and the filter screen covers the liquid inlet to filter the fluid entering the liquid inlet.
4. The plunger pump according to claim 1, characterized in that, the outer tube and the housing of the linear motor are connected by fasteners.
5. The plunger pump according to claim 1, characterized in that, a through hole is arranged on the guiding slider, and the through hole is arranged along the moving direction of the guiding slider.
6. The plunger pump according to claim 1, characterized in that, a concave notch is arranged on the circumferential surface of the guiding slider.
7. The plunger pump according to claim 1, characterized in that, the fixed valve comprises a fixed ball valve.
8. The plunger pump according to claim 1, characterized in that, the sealing plug is an annular part, the top tube is arranged in the central hole of the sealing plug and maintains a sliding seal.
9. The plunger pump according to claim 1, characterized in that, the diameter of the top tube is smaller than the diameter of the plunger, and the diameter of the plunger is smaller than the diameter of the guiding slider.
10. The plunger pump according to claim 1, characterized in that, the cross sections of the outer tube, the plunger and the top tube are circular.