A pump head assembly

Abstract

The utility model discloses a through type small clearance quick change valve. The utility model discloses a pump head axial through -hole is provided with adjustment seat, liquid inlet valve, pump head end cover in proper order, pump head end cover is provided with liquid outlet valve, in the reciprocating motion of plunger pump plunger, liquid inlet valve, liquid outlet valve open and close alternately, and medium passes through liquid inlet channel and enters liquid inlet valve, then passes through liquid inlet sealing surface and enters plunger chamber, and then passes through the axial overflow channel of liquid inlet valve body, liquid outlet sealing surface enters liquid outlet valve, and through liquid outlet channel, the pump head is discharged, and the unidirectional flow of medium is completed. Its beneficial effect is that the structure design is reasonable, reduces the residual liquid volume in the clearance chamber connected with the plunger chamber, the pump valve overall connection can complete the valve seat sealing test on the test bench, realizes the pump valve overall quick dismounting, improves the work efficiency and reduces the non - production operation time.

Description

Technical Field

[0001] This invention relates to a pump head assembly, and more particularly to a straight-through, small clearance quick-change valve for a pump head assembly, belonging to the field of oil and gas development technology. Background Technology

[0002] Carbon dioxide enhanced oil recovery (EOR) is a technology used in oil development to improve oil recovery rates and is an effective way to increase resource utilization efficiency. In recent years, with the application of EOR technology, the development of unconventional and challenging oil reservoirs has gradually become economically feasible.

[0003] Based on the reservoir deployment and implementation schedule, an economical model of low-pressure supercritical transportation and high-pressure supercritical injection was established, optimizing supercritical compressor injection into dense-phase injection, which is more economical and efficient. Pure carbon dioxide has a critical point of 7.38 MPa and 31.1℃. When the carbon dioxide pressure is higher than the critical pressure and the temperature is lower than the critical temperature, it is in a dense-phase interface state. Currently, the pump efficiency of high-density-phase carbon dioxide plunger injection pumps is relatively low. Although existing dense-phase pumps are inefficient, they still have a certain input-output ratio advantage compared to compressors. Improving pump efficiency has become a major research direction. The density of carbon dioxide in the dense-phase interface state is greatly affected by temperature; its density decreases sharply with increasing temperature. High-temperature media remaining in the pump valve clearance mixes with the low-temperature media during the suction process, causing the low-temperature media to heat up, its density to decrease, its volume to increase, and the mass of the suction medium to decrease, leading to reduced pump efficiency. Plunger injection pumps operate continuously for extended periods, and pump valves may fail during use. Existing pump valves consist of multiple components; during on-site maintenance and replacement, each component must be removed and reinstalled. After installation, the equipment must be started, and the sealing performance of the newly installed components must be checked and confirmed. Replacing pump valves during maintenance requires many tools and takes a long time. Furthermore, it is impossible to test the valve seat sealing performance in advance. If the sealing performance fails to meet the usage requirements, it is necessary to disassemble and reassemble the valves. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the plunger-type injection pump in existing carbon dioxide flooding operations, the present invention provides a straight-through, small clearance quick-change valve.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a straight-through small clearance quick-change valve, including a pump head, wherein an adjusting seat, an inlet valve, and a pump head end cover are sequentially arranged in the axial through hole of the pump head; and an outlet valve is arranged in the pump head end cover.

[0006] During the reciprocating motion of the plunger in the plunger pump, the inlet valve and outlet valve open and close alternately. The medium enters the inlet valve through the inlet channel, then enters the plunger cavity through the inlet sealing surface, and then enters the outlet valve through the axial flow channel and flow cavity of the valve body and the outlet sealing surface. Finally, it is discharged from the pump head through the outlet channel, completing the pressurized unidirectional flow of the medium.

[0007] The liquid inlet sealing surface is located between the valve body and the liquid inlet valve core.

[0008] The liquid outlet sealing surface is located between the valve body and the liquid outlet valve core.

[0009] The valve body is provided with an inlet valve core and a valve body plug plate arranged sequentially along the axial direction.

[0010] The conical mating surface between the inlet valve core and the valve body is the inlet sealing surface.

[0011] A spring I, a spring seat I, and a nut are sequentially installed along the axial direction of the inlet valve core, with the nut being fixedly connected to the inlet valve core.

[0012] The pump head and valve body are provided with a liquid inlet channel, through which the medium enters the liquid inlet valve cavity.

[0013] The valve body is provided with an axial flow passage.

[0014] The spring seat II of the discharge valve is located inside the pump head end cover, and the rod of the discharge valve core slides axially along the spring seat II.

[0015] A spring II is provided between the rod of the liquid outlet valve core and the spring seat II.

[0016] The spring seat II, the pump head end cover, and the radial channel of the pump head are connected to form a liquid outlet channel.

[0017] The conical mating surface between the outlet valve core and the valve body is the outlet sealing surface, which is connected to the outlet channel.

[0018] The valve body plug of the inlet valve and the outlet valve core of the outlet valve have an axial flow cavity, which is connected to the axial flow channel of the valve body.

[0019] A radial sealing ring is provided between the inner hole of the pump head and the adjusting seat, valve body, and pump head end cover.

[0020] A radial sealing ring is provided between the inner bore of the valve body and the valve body plug plate.

[0021] The beneficial effects of this invention are that the structure is reasonably designed, reducing the volume of residual liquid in the clearance cavity connected to the plunger cavity; the pump and valve are connected as a whole, and the valve seat sealing test can be completed on the test bench, realizing the rapid assembly and disassembly of the pump and valve as a whole, improving work efficiency and reducing non-production operation time. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the straight-through small clearance quick-change valve of the present invention.

[0023] Figure 2 This is a schematic diagram of the medium flow path of the straight-through small clearance quick-change valve of the present invention.

[0024] Figure 3 This is an exploded view of the quick-change valve in this invention.

[0025] Figure 4 This is an exploded view of the pump head in this invention.

[0026] In the diagram: 1. Pump head, 2. Adjusting seat, 3. Valve body, 4. Inlet valve core, 5. Spring I, 6. Spring seat I, 7. Nut, 8. Valve body plug, 9. Outlet valve core, 10. Spring II, 11. Spring seat II, 12. Pump head end cover, 13. Snap ring, 50. Inlet channel, 51. Valve body annular cavity, 52. Valve body inlet hole, 53. Inlet valve cavity, 54. Plunger cavity, 55. Axial flow channel, 56. Flow cavity, 57. Outlet valve inner cavity, 58. Outlet channel, 59. Inlet sealing surface, 60. Outlet sealing surface, 61. Radial through hole, 100. Inlet valve, 200. Outlet valve. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that the present invention is not limited to the specific embodiments listed, and any embodiment that conforms to the spirit of the present invention should be included within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing or simplifying the description of this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "seal" should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two components. A seal can be an oil seal, a packing seal, or other forms of seal. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] See appendix Figure 1-4The present invention discloses a straight-through, small clearance quick-change valve, comprising a pump head 1, an inlet valve 100, and an outlet valve 200. An adjusting seat 2, an inlet valve 100, and a pump head end cover 12 are sequentially arranged in the axial through hole of the pump head 1. The outlet valve 200 is arranged inside the pump head end cover 12. The outer end of the pump head end cover 12 is fixedly connected to the pump head 1 by bolts.

[0031] During the reciprocating motion of the plunger in the plunger pump, the inlet valve 100 and the outlet valve 200 open and close alternately. The medium enters the inlet valve 100 through the inlet channel 50, then enters the plunger cavity 54 through the inlet sealing surface 59, and then enters the outlet valve 200 through the axial flow channel 55, flow cavity 56, and outlet sealing surface 60 of the inlet valve body 3. Finally, it is discharged from the pump head through the outlet channel 58, completing the pressurized unidirectional flow of the medium.

[0032] The liquid inlet sealing surface 59 is disposed between the valve body 3 and the liquid inlet valve core 4 of the liquid inlet valve 100.

[0033] The liquid outlet sealing surface 60 is disposed between the valve body 3 and the liquid outlet valve core 9 of the liquid outlet valve 200.

[0034] The inlet valve 100 has an inlet valve core 4 and a valve body block plate 8 arranged sequentially along the axial direction inside the valve body 3.

[0035] The conical mating surface between the liquid inlet valve core 4 and the valve body 3 is the liquid inlet sealing surface 59.

[0036] A spring I5, a spring seat I6, and a nut 7 are sequentially installed along the axial direction of the rod of the inlet valve core 4. The nut 7 is fixedly connected to the inlet valve core 4, which determines the axial position of the spring I5 and the spring seat I6. Preferably, a retaining ring 13 is provided on the outside of the nut 7 on the rod of the inlet valve core 4 to prevent the nut 7 from loosening.

[0037] The pump head 1 and valve body 3 are provided with a liquid inlet channel 50, through which the medium enters the liquid inlet valve cavity 53. Furthermore, the liquid inlet channel 50 is composed of a radial through hole 61 in the pump head 1, a valve body annular cavity 51, and a valve body liquid inlet hole 52, through which the medium enters the liquid inlet valve cavity 53.

[0038] The valve body 3 is provided with an axial flow channel 55; further, the axial flow channel 55 is an axial through hole provided on the wall of the valve body 3.

[0039] The spring seat II11 of the discharge valve 200 is disposed inside the pump head end cover 12. The spring seat II11 is threadedly connected to the valve body 3. The rod of the discharge valve core 9 slides axially along the spring seat II11. Furthermore, the end face of the left end of the pump head end cover 12 presses against the valve body 3. A spring II10 is axially disposed between the rod of the discharge valve core 9 and the spring seat II11.

[0040] The spring seat II 11, the pump head end cover 12, and the radial channel of the pump head 1 are connected to form the liquid outlet channel 58.

[0041] The conical mating surface between the liquid outlet valve core 9 and the valve body 3 is the liquid outlet sealing surface 60, and the liquid outlet sealing surface 60 is connected to the liquid outlet channel 58.

[0042] There is an axial space between the valve body blocking plate 8 of the inlet valve 100 and the outlet valve core 9 of the outlet valve 200. This space is the flow chamber 56, which is connected to the axial flow channel 55 of the valve body 3. The medium enters the flow chamber 56 through the axial flow channel 55 of the valve body 3, pushing the outlet valve core 9 to slide to the right. The medium enters the inner cavity 57 of the outlet valve through the gap of the outlet sealing surface 60 and the radial liquid flow hole of the spring seat II 11, and then is discharged through the outlet channel 58.

[0043] A radial sealing ring is provided between the inner hole of the pump head 1 and the adjusting seat 2, the valve body 3, and the pump head end cover 12; a radial sealing ring is provided between the inner hole of the valve body 3 and the valve body blocking plate 8. The radial sealing ring can be a single sealing ring or a combined sealing structure.

[0044] The assembly process of the straight-through small clearance quick-change valve of this invention is as follows: The valve body 3 has an inlet sealing surface at the left end and an outlet sealing surface at the right end; preferably, both the inlet sealing surface and the outlet sealing surface are conical surfaces.

[0045] The inlet valve core 4 is inserted from one end of the inlet sealing surface of the valve body 3, and the sealing surface of the inlet valve core 4 matches the inlet sealing surface of the valve body 3; the spring I5 is installed from the outlet sealing surface end of the valve body 3 and fitted onto the rod of the inlet valve core 4; the spring seat I6 of the inlet valve 100 is installed from the outlet sealing surface end of the valve body 3 and fitted onto the rod of the inlet valve core 4, pressing the spring I5; the nut 7 is installed from the outlet sealing surface end of the valve body 3 and connected to the screw at the end of the rod of the inlet valve core 4, axially fixing the spring I5 and the spring seat I6, while adjusting the preload of the spring I5; the retaining ring 13 is installed in the retaining groove of the rod of the inlet valve core 4 to prevent the nut 7 from loosening; the valve body blocking plate 8 is installed from the outlet sealing surface end of the valve body 3 and fixedly connected to the valve body 3 by threads, and a radial sealing ring is installed between the valve body blocking plate 8 and the valve body 3.

[0046] The discharge valve core 9 of the discharge valve 200 is installed from the discharge sealing surface end of the valve body 3, and the sealing surface of the discharge valve core 9 matches the discharge sealing surface of the valve body 3; the spring II 10 is installed from the discharge sealing surface end of the valve body 3 and mounted on the rod of the discharge valve core 9; the spring seat II 11 of the discharge valve is mounted on the rod of the discharge valve core 9, and the spring seat II 11 is fixedly connected to the valve body 3 by threads, thereby axially fixing the discharge valve core 9 and the spring II 10, and adjusting the preload of the spring II 10 at the same time.

[0047] The inlet valve core 4 can overcome the axial force of the spring I5 of the inlet valve and slide along the valve body 3 axially.

[0048] The liquid outlet valve core 9 can overcome the axial force of the spring II 10 of the liquid outlet valve and slide axially along the inner hole of the spring seat II 11.

[0049] The straight-through small clearance quick-change valve is installed in the axial through hole of the pump head 1 of the plunger pump. The adjusting seat 2, valve body 3, and pump head end cover 12 are installed in the axial through hole of the pump head 1 in sequence. The left end of the adjusting seat 2 is close to the end face of the axial stepped hole of the pump head 1. The pump head end cover 12 is connected to the pump head 1 by bolts, which fixes the adjusting seat 2 and valve body 3 axially. The inner hole of the adjusting seat 2 on the left side of the inlet valve 100 is a plunger cavity 54 with variable volume. The plunger cavity 54 is connected to the axial flow passage 55 of the valve body 3.

[0050] When the plunger pump is running, the plunger reciprocates, changing the volume of the plunger chamber 54.

[0051] When the volume of the plunger cavity 54 increases, the pressure inside the plunger cavity 54 decreases. Under the action of pressure difference and the preload of the outlet valve core 9, it is pressed against the outlet sealing surface of the valve body 3. Under the action of pressure difference, the inlet valve core 4 overcomes the preload of the inlet valve spring I5 and slides to the left along the axial direction of the valve body 3. A narrow annular channel appears at the inlet sealing surface 59 between the inlet valve core 4 and the valve body 3. The medium in the inlet channel 50 enters the valve body annular cavity 51 and the valve body inlet hole 52, flows into the inlet valve cavity 53, and then enters the plunger cavity 54 through the narrow channel of the inlet sealing surface 59 between the inlet valve core 4 and the valve body 3.

[0052] When the volume of the plunger cavity 54 decreases, the pressure inside the plunger cavity 54 increases. Under the action of pressure difference and the preload of the inlet valve core 4, it is pressed against the inlet sealing surface of the valve body 3. Under the action of pressure difference, the outlet valve core 9 overcomes the preload of the spring II 10 and slides to the right along the axial direction of the valve body 3. An annular narrow channel appears at the outlet sealing surface 60 between the outlet valve core 9 and the valve body 3. The medium in the plunger cavity 54 passes through the axial flow passage 55 and flow cavity 56 of the valve body 3 and enters the outlet valve inner cavity 57 through the narrow channel at the outlet sealing surface 60. The medium entering the outlet valve inner cavity 57 is discharged from the pump head 1 through the outlet channel 58.

[0053] During the reciprocating motion of the plunger, the alternating opening and closing of the inlet valve 100 and the outlet valve 200 achieves pressurization and unidirectional flow of the medium.

[0054] This invention, a straight-through, small-clearance quick-change valve, solves the problem of large clearance in conventional plunger pumps and valves. It reduces the clearance cavity, decreases the volume of residual media, and minimizes the density drop caused by temperature increases during pump intake, thereby increasing the quality of the pumped media and improving pump efficiency. The straight-through, small-clearance quick-change valve also eliminates the problem of independently stacking valve bodies in similar products, making the pump and valve a single unit. This reduces on-site replacement work and required tools, shortening on-site operation time. Furthermore, the integrated pump and valve can undergo seat sealing tests on a test bench, improving on-site maintenance efficiency.

[0055] It should be noted that the above embodiments are examples and not limitations of the present invention, and those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A pump head assembly, comprising a pump head of a plunger pump and a straight-through, small-clearance quick-change valve, characterized in that: The straight-through small clearance quick-change valve is installed in the axial through hole of the pump head. An adjusting seat, an inlet valve, and a pump head end cover are arranged sequentially from left to right in the axial through hole of the pump head; an outlet valve is arranged in the pump head end cover; the inner hole of the adjusting seat on the left side of the inlet valve is a plunger cavity with variable volume, and the plunger cavity is connected to the axial flow passage of the valve body. The valve body is provided with an inlet valve core and a valve body plug plate arranged sequentially along the axial direction. The conical mating surface between the inlet valve core and the valve body is the inlet sealing surface. The inlet sealing surface is located between the valve body and the inlet valve core of the inlet valve; Along the axial direction of the inlet valve core, from left to right, spring I, spring seat I, and nut are installed sequentially, with the nut being fixedly connected to the inlet valve core; The liquid inlet sealing surface is located on the left side of spring I; The liquid inlet channel consists of a radial through hole in the pump head, an annular cavity in the valve body, and a liquid inlet hole in the valve body; During the reciprocating motion of the plunger in the plunger pump, the inlet valve and outlet valve open and close alternately. The medium in the inlet channel enters the valve body annular cavity and flows into the inlet valve cavity through the valve body inlet hole. Then, it enters the plunger through the narrow channel of the inlet sealing surface between the inlet valve core and the valve body. After passing through the axial flow channel and flow cavity of the valve body, it enters the outlet valve through the outlet sealing surface and is discharged from the pump head through the outlet channel, completing the pressurized unidirectional flow of the medium.

2. The pump head assembly according to claim 1, characterized in that: The liquid outlet sealing surface is located between the valve body and the liquid outlet valve core.

3. The pump head assembly according to claim 2, characterized in that: The valve body is provided with an axial flow passage.

4. The pump head assembly according to claim 3, characterized in that: The spring seat II of the discharge valve is located inside the pump head end cover, and the rod of the discharge valve core slides axially along the spring seat II. A spring II is provided between the rod of the liquid outlet valve core and the spring seat II.

5. The pump head assembly according to claim 4, characterized in that: The spring seat II, the pump head end cover, and the radial channel of the pump head are connected to form a liquid outlet channel.

6. The pump head assembly according to claim 5, characterized in that: The conical mating surface between the outlet valve core and the valve body is the outlet sealing surface, which is connected to the outlet channel.

7. The pump head assembly according to claim 6, characterized in that: The valve body plug of the inlet valve and the outlet valve core of the outlet valve have an axial flow cavity, which is connected to the axial flow channel of the valve body.

8. The pump head assembly according to claim 1, characterized in that: A radial sealing ring is provided between the inner hole of the pump head and the adjusting seat, valve body, and pump head end cover; A radial sealing ring is provided between the inner bore of the valve body and the valve body plug plate.

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