CN113294331A

CN113294331A - Integrated pump cylinder structure and machining method of thick-wall pump cylinder

Info

Publication number: CN113294331A
Application number: CN202110667209.3A
Authority: CN
Inventors: 吕俊锋; 董利锋; 张安源; 任志原; 贾浩博; 刘远兵
Original assignee: Karamay Shengli Plateau Machinery Ltd
Current assignee: Karamay Shengli Plateau Machinery Ltd
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2021-08-24

Abstract

The invention discloses an integrated pump cylinder structure and a processing method of a thick-wall pump cylinder thereof, which comprises the following steps: processing external threads at two ends and vertical sealing surfaces: firstly, processing external threads at one end of a thick-wall pump cylinder and a sealing end surface vertical to a central axis of the thick-wall pump cylinder, turning around, confirming the finished product length of the thick-wall pump cylinder, and then processing the external threads at the other end; and (3) rough honing of the sealing section: roughly honing the size of an inner hole of the sealing section to a nominal size, wherein the tolerance range is between +0.10 mm and +0.15 mm; a rough honing step of the reaming section: roughly honing the first reaming section and the second reaming section to a design size; electroplating the sealing section: carrying out chromium plating treatment on the surface of the inner hole of the sealing section; and (3) aging treatment: carrying out aging treatment on the thick-wall pump cylinder; and a fine honing step of the sealing section: and finely honing the size of the inner hole of the sealing section to a nominal size, wherein the tolerance range is between +0.01 and +0.04mm, and the surface roughness of the inner hole of the sealing section is less than or equal to 0.4 um. Therefore, the coaxiality requirement of the inner hole can be ensured.

Description

Integrated pump cylinder structure and machining method of thick-wall pump cylinder

Technical Field

The invention relates to the technical field of key accessory structures of oil field oil extraction equipment, in particular to an integrated pump cylinder structure.

Background

The prior art integral pump barrel structure is generally classified into a tube pump structure (as shown in fig. 1) and a rod pump structure (as shown in fig. 2). The tubular pump structure in fig. 1 mainly comprises a valve housing reducing connector (optional) B23 with an extractor, a thick-wall pump barrel B13, a plunger upper open valve housing C11, a plunger closed valve housing C13, a fixed valve housing C16, a tubing coupling C34, a pump barrel coupling C35, a mechanical support connector N12, a support connector N13, an upper lengthening nipple N21, a lower lengthening nipple N22, an integral plunger P21, a fixed valve extractor P31, a support cup race (HR type) S13, a support cup pressure cap (HR type) S14, a support cup coupling S16, a support cup mandrel (HR type) S17, a support cup (HR type) S18, a valve ball and valve seat V11, a mechanical bottom locking support assembly S22, an internally threaded plunger valve housing C15, an internally threaded plunger connector C22, an internally threaded plunger P23 and the like, wherein the pump barrel C21 and the N35 are respectively arranged above and below the closed pump barrel B13. The rod pump structure shown in FIG. 2 mainly comprises a thick-wall pump barrel B12, a valve rod reducing joint B21, a plunger upper valve cover C12, an external thread plunger closed valve cover C13, a pump barrel closed valve cover C14, a pump barrel upper joint C21, an extension coupling C31, a valve rod guide sleeve G11, a valve seat plug P12, an integral plunger piston^dP21, a valve rod R11, a supporting cup core shaft (HR type) S11, a supporting cup (HR type) S12, a supporting cup seat ring (HR type) S13, a supporting cup pressing cap (HR type) S14, a supporting cup reducing joint S16, a supporting cup (O type) S31, a supporting cup core shaft (O type) S32, a supporting cup seat ring (O type) S33, a supporting cup pressing cap (O type) S34, a valve ball and valve seat V11, and lengthened couplings C31 are arranged above and below the thick-wall pump cylinder B12.

The elongated collar and the elongated nipple shown in figures 1 and 2 are named differently and function similarly in practice. Are short sections with an inner diameter larger than the pump barrel. The military is fixedly connected with the pump barrel through threads. When the integral plunger P21 moves in the pump barrel, the collision between the plunger and other parts at the upper end and the lower end of the pump barrel is avoided at the upper dead point and the lower dead point, and the anti-impact distance is ensured.

The pump barrel structure of the traditional oil well pump has the following problems:

the upper and lower reaming short sections are difficult to ensure the coaxiality with the pump cylinder;

even if the precisely aligned reaming short section is used, before machining, the inner hole is firstly used as a reference for alignment, and then the threads at two ends are machined. Clamping errors, alignment measurement errors, machine tool errors and deformation errors during assembly also exist.

Secondly, steps exist in the outer diameter size, and the installation and maintenance space is influenced;

the tubing pump is installed and lifted up to be overhauled through the inner hole of the sleeve. The rod-type oil pump needs to be installed, lifted up and overhauled through an inner hole of an oil pipe.

During threaded connection, in order to ensure certain strength, the outer diameter of the female buckle part is larger than that of the male buckle part. Resulting in a C35 pump barrel collar, or C31 lengthened collar, having an outer diameter significantly larger than the outer diameter of the pump barrel. Occupying installation and maintenance space.

Thirdly, due to the fact that the wall thickness is limited, the strength is not easy to guarantee due to threaded connection;

especially, the rod pump has a serious space limitation. Examples are: 2-7/8NU of oil pipe inner diameter 62 mm. In order to ensure smooth downward movement, the outer diameter of the lengthened coupling is controlled to be 59mm, and the inner diameter is 46 mm. The outside diameter 57 and the inside diameter 44.45mm of the pump cylinder. 59-44.45 is 14.5mm, and the thickness of a single side is only 14.5/2 is 7.25mm, and the single side is divided by the male and female buttons. The remaining thickness of the pin and box, minus the tooth height of 1.8mm, is about 5.45 mm, which is about 2.725 mm. The screw connection strength is obviously insufficient.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide an integrated pump cylinder structure, the outer diameter of a thick-wall pump cylinder is basically consistent, and reaming sections are added at two ends of a middle sealing section of an inner hole, so that the installation and maintenance space can be ensured, and the overall strength can be improved.

The invention also aims to provide a processing method of the thick-wall pump cylinder with the integrated pump cylinder structure, which can ensure the coaxiality of the reaming section and the sealing section of the thick-wall pump cylinder.

In order to achieve the purpose, the invention provides an integrated pump cylinder structure, wherein an oil extraction assembly comprises a fixed valve assembly, a plunger assembly and a pump cylinder assembly, and the pump cylinder assembly comprises a thick-wall pump cylinder, a pump cylinder closed cover, a valve seat and a fixed valve core shaft assembly; the two ends of the thick-wall pump cylinder comprise a hole expanding section and external threads; one end of the pump cylinder closed cover is coaxially connected with one end of the thick-wall pump cylinder; one end of the valve seat is coaxially connected with the other end of the pump cylinder closed cover; one end of the fixed valve core shaft assembly is coaxially connected with the other end of the valve seat.

In a preferred embodiment, the reaming section of the thick-walled pump barrel comprises a first reaming section and a second reaming section, the first reaming section is arranged at one end of the thick-walled pump barrel, the second reaming section is arranged at the other end of the thick-walled pump barrel, and the thick-walled pump barrel further comprises a sealing section which is arranged between the first reaming section and the second reaming section.

In a preferred embodiment, the inner diameters of the first and second reaming sections are 1-6 mm larger than the inner diameter of the sealing section.

In a preferred embodiment, the coaxiality of the first hole expanding section, the second hole expanding section and the sealing section is controlled within 0.03 mm.

In a preferred embodiment, the thick-walled pump barrel has an outer diameter of

(+ 0.05-0) mm, the length of the thick-wall pump cylinder is 3750mm, the length of the first reaming section is 840 +/-20 mm, and the inner diameter of the first reaming section is

The length of the second hole expanding section is 350 +/-20 mm, and the inner diameter of the sealing section is

(+ 0.05-0) mm, the thickness of the chromium plating anticorrosive layer on the surface of the inner hole of the sealing section is 0.08mm, and the hardness of the chromium plating anticorrosive layer is HV 900-1160.

In a preferred embodiment, the first and second reaming sections and the sealing section comprise an included angle of 135 degrees therebetween, the inner hole surface roughness of the first and second reaming sections is 1.6 μm, the inner hole surface roughness of the sealing section is 0.4 μm, and the roughness of the outer circular surface of the thick-walled pump cylinder is 1.6.

In order to achieve another purpose, the invention provides a processing method of a thick-wall pump cylinder with an integrated pump cylinder structure, which comprises the following steps: processing external threads at two ends and vertical sealing surfaces: firstly, processing external threads at one end of a thick-wall pump cylinder and a sealing end surface vertical to a central axis of the thick-wall pump cylinder, turning around, confirming the finished product length of the thick-wall pump cylinder, and then processing the external threads at the other end; and (3) rough honing of the sealing section: roughly honing the size of an inner hole of the sealing section to a nominal size, wherein the tolerance range is between +0.10 mm and +0.15 mm; a rough honing step of the reaming section: roughly honing the first reaming section and the second reaming section to a design size; electroplating the sealing section: carrying out chromium plating treatment on the surface of the inner hole of the sealing section; and (3) aging treatment: carrying out aging treatment on the thick-wall pump cylinder; and a fine honing step of the sealing section: and finely honing the size of the inner hole of the sealing section to a nominal size, wherein the tolerance range is between +0.01 and +0.04mm, and the surface roughness of the inner hole of the sealing section is less than or equal to 0.4 um.

In a preferred embodiment, the electroplating step comprises degreasing, hot water washing, cold water washing, etching, cold water washing, deionized water washing, main plating, cold water washing, removing and wiping to dry the dimension.

In a preferred embodiment, the thickness of the chromium-plated anticorrosive layer on the surface of the inner hole of the sealing section is 0.08mm, and the hardness of the chromium-plated anticorrosive layer is HV 900-1160.

In a preferred embodiment, the aging step comprises: heating to 400 ℃ within one hour, keeping the temperature for 1-2 hours, automatically cutting off the power, cooling to 200 ℃ along with the furnace, discharging, and air cooling.

Compared with the prior art, the integrated pump cylinder structure and the processing method of the thick-wall pump cylinder have the following beneficial effects: through the specially designed thick-wall pump cylinder structure with the integrated pump cylinder structure and the processing technology of the thick-wall pump cylinder, the coaxiality of the reaming section and the sealing section of the thick-wall pump cylinder can be better ensured, and the pump clamping is reliable in operation and difficult to occur; lengthened couplings at two ends of the thick-wall pump cylinder are saved, so that the number of parts is greatly reduced, the structure is compact, and the cost is easy to control; the raw materials are easy to manage, and only one specification of pipe is needed, so that various design requirements can be met; the abrasion stroke is easy to control, the upper part and the lower part of the sealing surface are ground when the whole stroke is carried out, no blank section is left, and the pump clamping probability is reduced when a well is repaired or the anti-impact distance is adjusted.

Drawings

FIG. 1 is a schematic diagram illustrating the structure and components of a tube pump according to one embodiment of the prior art;

FIG. 2 is a schematic diagram illustrating the structure and components of a rod pump according to one embodiment of the prior art;

FIG. 3 is a schematic diagram of the structure of a recovery assembly according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a pump barrel assembly according to an embodiment of the present invention;

FIG. 5 is a schematic illustration of process feature dimensions and tolerance requirements for a thick-walled pump barrel according to an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating the construction of a sucker rod pumping assembly according to one embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating the construction of a long plunger pump production assembly according to an embodiment of the present invention;

FIG. 8 is a schematic diagram illustrating the construction of a whole barrel pump production assembly according to one embodiment of the present invention;

FIG. 9 is a process flow diagram of a method of manufacturing a thick-walled pump barrel of unitary barrel construction in accordance with an embodiment of the present invention;

FIGS. 10-17 are a schematic representation of a real-time system according to the present inventionIn the manner of

The machining process of the thick-wall pump cylinder with the specification is clamped.

Description of the main reference numerals:

1-a fixed valve assembly, 2-a plunger assembly, 3-an integrated pump barrel assembly of a rod pump, 301-a thick-wall pump barrel, 3011-a first reaming section, 3012-a second reaming section, 3013-a sealing section, 302-a pump barrel closed cover, 303-a valve seat, 304-a fixed valve core shaft assembly, 30-a rod pump, 3001-an oil pipe column, 3002-a bush limit table, 3003-a rod pump plunger, 401-a thick-wall pump barrel of a long plunger pipe type pump integrated pump barrel, 4011-a reaming section, 4001-a superior oil pipe, 4002-a fixed valve limit table, 4003-an oil pipe column, 4004-a lower part of a disconnecting device, 4005-an upper part of a disconnecting device, 4006-a long plunger, 501-a thick-wall pump barrel of an integrated pump barrel of a whole barrel pump, 5001-a superior oil pipe, 5002-a fixed valve limit table, 5003-tubing string, 5004-lower part of the disconnector, 5005-upper part of the disconnector, 5006-short plunger.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 3 to 5, according to an integrated pump cylinder structure of a preferred embodiment of the present invention, the oil recovery assembly includes a fixed valve assembly 1, a plunger assembly 2, and a pump cylinder assembly 3, and the pump cylinder assembly 3 includes a thick-walled pump cylinder 301, a pump cylinder closed cover 302, a valve seat 303, and a fixed valve core shaft assembly 304. Both ends of the thick-walled pump barrel 301 include a flared section and external threads. One end of the pump cylinder closed cover 302 is coaxially connected with one end of the thick-wall pump cylinder 301 through threads. One end of the valve seat 303 is coaxially connected with the other end of the pump cylinder closed cover 302; one end of the fixed spool shaft assembly 304 is coaxially connected with the other end of the valve seat 303.

In some embodiments, the reaming sections of thick-walled pump barrel 301 include a first reaming section 3011 and a second reaming section 3012, first reaming section 3011 being disposed at one end of thick-walled pump barrel 301, second reaming section 3012 being disposed at the other end of thick-walled pump barrel 301, thick-walled pump barrel 301 further including a sealing section 3013 disposed between first reaming section 3011 and second reaming section 3012. The inner diameters of first reaming section 3011 and second reaming section 3012 are 1-6 mm greater than the inner diameter of sealing section 3013. The concentricity of first reaming section 3011, second reaming section 3012 and sealing section 3013 is controlled to be within 0.03 mm.

In some embodiments, the thick-walled pump barrel 301 has an outer diameter of

(+ 0.05-0) mm, the length of the thick-wall pump barrel 301 is 3750mm, the length of the first reaming section 3011 is 840 +/-20 mm, and the inner diameter of the first reaming section 3011 is

The length of the second reaming section 3012 is 350 + -20 mm and the inner diameter of the sealing section 3013 is

(+ 0.05-0) mm, the thickness of the chromium plating anticorrosive layer on the inner hole surface of the sealing section 3013 is 0.08mm, and the hardness of the chromium plating anticorrosive layer is HV 900-1160.

In some embodiments, the first and

second reaming sections

3011 and 3012 and the sealing section 3013 include an over angle of 135 °, the first and

second reaming sections

3011 and 3012 have an inner bore surface roughness of 1.6 μm, the sealing section 3013 has an inner bore surface roughness of 0.4 μm, and the outer cylindrical surface of the thick-walled pump barrel 301 has a roughness of 1.6.

As shown in fig. 6 to 8, in some embodiments, the integrated pump barrel structure includes an integrated pump barrel applied to a rod pump, an integrated pump barrel of a long plunger tube pump, an integrated pump barrel of a whole barrel pump, and the like. Referring to fig. 6, the present embodiment mainly takes an integrated pump barrel of a rod pump as an example, and the thick-wall pump barrel 301 of the integrated pump barrel structure of the embodiment of fig. 6 has two ends with a reaming section, such as the aforementioned first reaming section 3011 and second reaming section 3012, and the detailed structure is not described herein again. Referring to fig. 7, fig. 7 is a schematic diagram of an integrated pump barrel structure of a long plunger and tube pump in the embodiment, and the integrated pump barrel structure of the long plunger and tube pump in the embodiment of fig. 7 mainly includes a thick-walled pump barrel 401 of the integrated pump barrel of the long plunger and tube pump, an upper oil pipe 4001, a fixed valve limiting table 4002, an oil pipe 4003, a lower part 4004 of a disconnecting and connecting device, an upper part 4005 of a disconnecting and connecting device, a long plunger 4006, and the like. The thick-walled pump barrel 401 of the integrated pump barrel structure only has a reaming section 4011 at one end and a sealing section at the other end, and the length of the reaming section 4011 is slightly longer than that of the sealing section, but the structural dimensions, tolerance requirements and the like of the sealing section and the reaming section are similar to those of the embodiment in fig. 6, and the like, and are not repeated herein. Referring to fig. 8, the embodiment of fig. 8 is a schematic structural illustration of an integral pump barrel structure of a whole barrel pump, and the integral pump barrel structure of the whole barrel pump of the embodiment of fig. 8 mainly includes a thick-walled pump barrel 501 of the integral pump barrel of the whole barrel pump, an upper-stage oil pipe 5001, a fixed valve limit table 5002, an oil pipe column 5003, a lower part 5004 of a disconnecting device, an upper part 5005 of the disconnecting device, a short plug 5006 and the like. The thick-walled pump barrel 501 with the integral pump barrel structure also has a reaming section 5011 at one end and a sealing section at the other end, but the length of the reaming section 5011 is shorter than that of the sealing section, however, the structural dimensions and tolerance requirements of the sealing section and the reaming section are similar to those of the embodiment in fig. 6, and the like, and detailed descriptions thereof are omitted here.

Referring to fig. 5 together with fig. 9, to achieve the above another object, the present invention provides a method for processing a thick-walled pump cylinder 301 with an integrated pump cylinder structure, including the following steps: processing external threads at two ends and vertical sealing surfaces: firstly, the external thread at one end of the thick-wall pump barrel 301 and the sealing end surface vertical to the central axis of the thick-wall pump barrel 301 are processed, then the end is turned around, and the external thread at the other end is processed after the finished product length of the thick-wall pump barrel 301 is confirmed. Rough honing step of the seal section 3013: the inner bore size of the seal section 3013 is rough honed to nominal size with a tolerance range between +0.10 to +0.15 mm. A rough honing step of the reaming section: first and

second reaming sections

3011 and 3012 are rough honed to the design dimensions. Electroplating step of the sealing section 3013: the surface of the inner hole of the sealing section 3013 is subjected to chrome plating. The thickness of the chromium plating anticorrosive layer on the surface of the inner hole of the sealing section 3013 is 0.08mm, and the hardness of the chromium plating anticorrosive layer is HV 900-1160. The electroplating step comprises oil removal, hot water washing, cold water washing, etching, cold water washing, deionized water washing, main plating, cold water washing, disassembly and wiping to dry the dimension. And (3) aging treatment: the thick-walled pump barrel 301 is subjected to aging treatment. The aging treatment step comprises: heating to 400 ℃ within one hour, keeping the temperature for 1-2 hours, automatically cutting off the power, cooling to 200 ℃ along with the furnace, discharging, and air cooling. And a finish honing step of the seal section 3013: and finely honing the size of the inner hole of the sealing section 3013 to a nominal size, wherein the tolerance range is between +0.01 and +0.04mm, the surface roughness of the inner hole of the sealing section 3013 is less than or equal to 0.4um, and the tolerance of other forms and positions meets the requirements of drawings.

In some embodiments, in the method for processing the thick-walled pump cylinder 301 of the integrated pump cylinder structure of the present invention, the material yield strength σ of the thick-walled pump cylinder 301_sNot less than 413MPa, and the hardness of the core of the matrix is between 90HRB-23HRC (equivalent to HRA 55-62). The minimum thickness of one side of the chromium plating anticorrosive layer is 0.08mm, the hardness is HV900-1160, the chromium plating anticorrosive layer is firmly combined with the matrix metal, and the defects of air bubbles, pits, peeling and the like cannot be generated on the surface of the chromium plating anticorrosive layer. The inner diameter tolerance of the thick-wall pump barrel 301 is within the full-length range, the variation is less than or equal to 0.025mm, and the inner diameter of the thick-wall pump barrel 301 is detected by a drift diameter gauge with a first-level gap and a length of 1.5 meters by 100%. Referring to FIG. 3, in some embodiments, the chrome plating process may be replaced with a boriding process, with the remaining requirements being similar to the chrome plating process.

In some embodiments, the method for processing the thick-walled pump cylinder 301 of the integrated pump cylinder structure of the present invention preferably includes: and (3) numbering: printing a product number at a proper position of the thick-wall pump barrel 301; acute-angle blunting step: all acute angles of the thick-walled pump barrel 301 are inverted to obtuse angles; and a packaging step: the packaging requirements are that before delivery, both ends of the screw thread and the sealed end surface are provided with protective sleeves, the packaged delivery is carried out, and 25 pieces are provided as one frame.

In some embodiments, generally, the nominal dimensions of the internal bore dimensions of the seal segment 3013 are in a series comprising: 31.75, 38.10, 44.45, 50.80, 57.15, 69.85, 82.55 and 95.25(mm) etc. to meet the requirements of different specification series of products.

As shown in FIGS. 10-17, in some embodiments, FIGS. 10-17 are in a real-time manner according to the present invention

The machining process of the thick-walled pump barrel 301 of the specification is blocked. Wherein the specification of the material is described in detail as

The thick-wall pump barrel 301 has two types of the thick-wall pump barrel 301 with the lengths of 5.1 meters and 7.3 meters respectively, and the mechanical processing technology of the tungsten-penetration-plated whole barrel type oil well pump is adopted. The process card only relates to the processing processes of the thick-wall pump barrel 301 with the two specifications, but the invention is not limited to the processing processes, and the processing processes of products with other specifications can be specifically adjusted according to actual needs.

In summary, the integrated pump cylinder structure and the processing method of the thick-wall pump cylinder thereof have the following advantages: through the specially designed thick-wall pump cylinder structure with the integrated pump cylinder structure and the processing technology of the thick-wall pump cylinder, the coaxiality of the reaming section and the sealing section of the thick-wall pump cylinder can be better ensured, and the pump clamping is reliable in operation and difficult to occur; lengthened couplings at two ends of the thick-wall pump cylinder are saved, so that the number of parts is greatly reduced, the structure is compact, and the cost is easy to control; the raw materials are easy to manage, and only one specification of pipe is needed, so that various design requirements can be met; the abrasion stroke is easy to control, the upper part and the lower part of the sealing surface are ground when the whole stroke is carried out, no blank section is left, and the pump clamping probability is reduced when a well is repaired or the anti-impact distance is adjusted.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. The utility model provides an integral type pump barrel structure, oil recovery assembly includes standing valve assembly, plunger assembly and pump barrel assembly, its characterized in that, the pump barrel assembly includes:

the thick-wall pump cylinder comprises a hole expanding section and external threads at two ends;

one end of the pump cylinder closed cover is coaxially connected with one end of the thick-wall pump cylinder;

one end of the valve seat is coaxially connected with the other end of the pump cylinder closed cover; and

and one end of the fixed valve core shaft assembly is coaxially connected with the other end of the valve seat.

2. The integrated pump barrel structure of claim 1, wherein the counterbore section of the thick-walled pump barrel comprises a first counterbore section and a second counterbore section, the first counterbore section being disposed at one end of the thick-walled pump barrel, the second counterbore section being disposed at the other end of the thick-walled pump barrel, the thick-walled pump barrel further comprising a seal section disposed between the first counterbore section and the second counterbore section.

3. The integral pump barrel structure of claim 2, wherein said first and second counterbore sections have an inside diameter that is 1-6 mm greater than the inside diameter of said seal section.

4. The integrated pump barrel structure according to claim 2, wherein the coaxiality of the first counterbore section, the second counterbore section and the sealing section is controlled within 0.03 mm.

5. The integrated pump cylinder structure according to claim 2, wherein the thick-walled pump cylinder has an outer diameter of

The length of thick wall pump barrel is 3750mm, the length of first reaming section is 840 +/-20 mm, the internal diameter of first reaming section is

The length of the second reaming section is 350 +/-20 mm, and the inner diameter of the sealing section is

The thickness of the chromium plating anticorrosive layer on the surface of the inner hole of the sealing section is 0.08mm, and the hardness of the chromium plating anticorrosive layer is HV 900-1160.

6. The integral pump barrel structure of claim 2, wherein said first and second counterbore sections include a 135 ° clearance angle with said seal section, said first and second counterbore sections have an inner bore surface roughness of 1.6 μm, said seal section has an inner bore surface roughness of 0.4 μm, and said thick-walled pump barrel has an outer cylindrical surface roughness of 1.6.

7. A processing method of a thick-wall pump cylinder with an integrated pump cylinder structure is characterized by comprising the following steps:

processing external threads at two ends and vertical sealing surfaces: firstly, processing an external thread at one end of the thick-wall pump cylinder and a sealing end surface vertical to a central axis of the thick-wall pump cylinder, turning around, confirming the finished product length of the thick-wall pump cylinder, and then processing the external thread at the other end;

and (3) rough honing of the sealing section: roughly honing the size of an inner hole of the sealing section to a nominal size, wherein the tolerance range is between +0.10 mm and +0.15 mm;

a rough honing step of the reaming section: roughly honing the first reaming section and the second reaming section to a design size;

electroplating the sealing section: carrying out chromium plating treatment on the surface of the inner hole of the sealing section;

and (3) aging treatment: carrying out aging treatment on the thick-wall pump cylinder; and

fine honing of the sealing section: and finely honing the size of the inner hole of the sealing section to a nominal size, wherein the tolerance range is between +0.01 mm and +0.04mm, and the surface roughness of the inner hole of the sealing section is less than or equal to 0.4 um.

8. A method of manufacturing a thick-walled pump barrel of unitary pump barrel construction as claimed in claim 7, wherein said plating step comprises degreasing, hot water washing, cold water washing, etching, cold water washing, deionized water washing, main plating, cold water washing, removing and wiping out the dimensional dimensions.

9. A method for manufacturing a thick-walled pump cylinder of an integral pump cylinder structure as claimed in claim 7, wherein the thickness of the chromium plating anticorrosive coating on the inner hole surface of the sealing section is 0.08mm, and the hardness of the chromium plating anticorrosive coating is HV 900-1160.

10. A method of forming a thick-walled pump barrel of unitary pump barrel construction as claimed in claim 7, wherein said aging step includes: heating to 400 ℃ within one hour, keeping the temperature for 1-2 hours, automatically cutting off the power, cooling to 200 ℃ along with the furnace, discharging, and air cooling.