An improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage

Abstract

The invention discloses an improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage, comprising a housing and an inner core component arranged in the housing, wherein the housing is coaxially provided with a first internal threaded hole, a first channel hole and a second channel hole connected in sequence along the longitudinal direction, and a conical chamfer is arranged at the orifice position of the step surface adjacent to the first channel hole on the second channel hole; a third channel hole connected to the first channel hole is arranged transversely along the housing; the inner core component comprises a plunger seat and a plunger arranged in the plunger seat, and N pairs of throttling holes are arranged at intervals on the plunger seat; the plunger seat comprises a section of threaded sleeve and a section of light hole sleeve adjacent in the axial direction; the outer circular front end of the light hole sleeve of the plunger seat is coaxially provided with an outer circular conical surface, and the outer circular conical surface of the outer circular front end of the light hole sleeve is pressed against the conical chamfered surface of the housing to form a sealed connection with the conical chamfer. The invention can reduce the internal leakage of the plunger orifice plate and improve the flux accuracy and use reliability of the plunger orifice plate.

Description

Technical Field

[0001] The invention relates to the technical field of throttling orifice plates, and in particular to an improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage. Background Art

[0002] Orifice plates are widely used in the industrial field. They can limit the flow of fluid in the pipeline, so that the pressure of the fluid is reduced. However, conventional orifice plates in the prior art still have the following problems when used: first, the structure and function are relatively simple, the throttling capacity is single, and it cannot meet the requirements of installation and commissioning under actual working conditions on site; second, the reliability is not high, and the performance stability and reliability are poor when used for a long time in special environments such as high temperature and high pressure and nuclear power plants, and the service life is short.

[0003] The utility model patent with the authorization publication number CN212643883U discloses a plunger-type orifice plate, which is a special plunger orifice plate developed by our company for large advanced pressurized water reactors and high temperature gas-cooled reactor nuclear power plants, including a shell and a plunger sleeve and a plunger arranged in the inner hole of the shell. The large outer circle of the plunger sleeve is threadedly connected with the inner hole of the shell, and an annular gap is arranged between the small outer circle of the plunger sleeve and the inner hole of the shell. The small outer circle of the plunger sleeve is also provided with a plunger sleeve flow hole penetrating the inner hole of the plunger sleeve; the large outer circle of the plunger The plunger is threadedly connected to the inner hole of the plunger sleeve, the small outer circle of the plunger is matched with the inner hole of the plunger sleeve, a blind hole is arranged on the end of the plunger close to the small outer circle of the plunger, and a number of throttling holes connected to the blind hole are arranged at intervals on the small outer circle of the plunger; a first channel connected to the flow hole of the plunger sleeve and a second channel connected to the blind hole are respectively arranged on the shell; the throttling hole on the small outer circle of the plunger is completely closed by the inner hole of the plunger sleeve at the initial position, and the throttling hole can be moved to be connected with the flow hole of the plunger sleeve by adjusting the axial position of the plunger.

[0004] The plunger-type orifice plate of the above structure has good stability in operation under the design pressure, temperature and operating conditions, but has the following disadvantages: since a flat top pressure sealing structure is adopted between the front end of the plunger sleeve and the inner hole end face of the shell, and due to processing and manufacturing errors, there is a certain unevenness error between the end face of the plunger sleeve and the inner hole end face of the shell, which makes it difficult to form a high-tight sealing fit, resulting in a certain internal leakage of the fluid between the end face of the plunger sleeve and the inner hole end face of the shell under high pressure, resulting in a certain deviation between the test flow and the actual flow, and ultimately affecting the flux accuracy of the plunger-type orifice plate.

[0005] Therefore, it is necessary to make technical improvements to the company's previous patents in order to reduce the internal leakage of the plunger orifice plate and improve the flux accuracy of the plunger orifice plate in response to the above problems. Summary of the invention

[0006] In order to solve the above problems, the present invention proposes an improved structure of a high-pressure fluid plunger orifice plate that can reduce internal leakage, aiming to reduce internal leakage of the plunger orifice plate, improve the flux accuracy of the plunger orifice plate, and improve the reliability of the plunger orifice plate. The specific technical solution is as follows:

[0007] An improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage comprises a shell and an inner core component arranged in the shell, wherein the shell is coaxially provided with a first internal threaded hole, a first channel hole and a second channel hole which are connected in sequence along the longitudinal direction, and the aperture of the first internal threaded hole is larger than the aperture of the first channel hole, the aperture of the first channel hole is larger than the aperture of the second channel hole, and a conical chamfer is provided at the orifice position of the step surface adjacent to the first channel hole on the second channel hole; a third channel hole connected to the first channel hole is transversely provided on the shell; the inner core component comprises a plunger seat and a plunger arranged in the plunger seat, the plunger seat comprises a section of threaded sleeve and a section of light hole sleeve which are adjacently connected in the axial direction, the threaded sleeve is coaxially provided with an external thread and an internal threaded hole, and the light hole sleeve is coaxially provided with an external thread and an internal threaded hole. An outer circle and an inner hole are provided, and N pairs of throttling holes connected to the inner hole of the light hole sleeve are arranged at intervals on the outer circle of the light hole sleeve; the plunger includes a section of stud and a section of cylinder connected axially adjacent to each other; the light hole sleeve part of the plunger seat is installed in the first channel hole of the shell, the outer thread of the threaded sleeve part of the plunger seat is threadedly connected with the first internal threaded hole of the shell, the cylindrical part of the plunger is installed in the inner hole of the light hole sleeve of the plunger seat and is slidably connected with the inner hole of the light hole sleeve, and the stud part of the plunger is threadedly connected with the internal threaded hole of the threaded sleeve part of the plunger seat; an outer conical surface is coaxially provided at the front end of the outer circle of the light hole sleeve of the plunger seat, and the outer conical surface at the front end of the outer circle of the light hole sleeve is pressed and connected to the conical chamfered surface of the shell to form a sealed connection with the conical chamfer.

[0008] In the present invention, a second internal threaded hole is further provided on the shell at one end close to the first internal threaded hole, the aperture of the second internal threaded hole is larger than the aperture of the first internal threaded hole, a clamping screw plug is installed in the second internal threaded hole, a sealing gasket is provided at the front end of the clamping screw plug, and the sealing gasket is pressed on the step surface adjacent to the second internal threaded hole and the first internal threaded hole.

[0009] In the present invention, a third internal threaded hole connected to the third channel hole is provided on the shell at the outer end of the third channel hole, and a fourth internal threaded hole connected to the second channel hole is provided on the shell at the outer end of the second channel hole; the aperture of the third internal threaded hole is larger than the aperture of the third channel hole, and the aperture of the fourth internal threaded hole is larger than the aperture of the second channel hole.

[0010] Preferably, an annular gap for high-pressure fluid to enter is provided between the first channel hole of the housing and the outer circle of the light hole sleeve of the plunger seat.

[0011] Preferably, there are three pairs of throttling holes, and the three pairs of throttling holes are arranged transversely through the light hole sleeve of the plunger seat.

[0012] In the present invention, a hexagonal hole is arranged at one end of the cylindrical portion of the plunger.

[0013] In the present invention, one end of the threaded sleeve of the plunger seat is further provided with an external hexagonal portion.

[0014] Preferably, the length of the conical chamfer on the shell is 1 mm, and the angle of the chamfer is 45°.

[0015] Preferably, the sealing gasket is a graphite stainless steel composite gasket, and the graphite stainless steel composite gasket comprises a stainless steel gasket and graphite gaskets integrally connected to both sides of the stainless steel gasket.

[0016] In the present invention, the pressure of the high-pressure fluid is 8-15 MPa.

[0017] Preferably, the high-pressure fluid is high-temperature and high-pressure gas.

[0018] As a further improvement, an improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage of the present invention is also equipped with a linkage locking integrated debugging tool, the linkage locking integrated debugging tool includes a linkage locking body and a butterfly spring assembly, the linkage locking body includes a chassis, a hexagonal column arranged at the center position of the front side of the chassis, a positioning ring arranged on the front side of the chassis and coaxial with the hexagonal column, and an inner hexagonal hole arranged on the positioning ring; wherein, the shape and size of the hexagonal column are adapted to the shape and size of the inner hexagonal hole on the plunger, and the inner hexagonal hole on the positioning ring is adapted to the shape and size of the outer hexagon on the plunger seat; wherein, the hexagonal column is composed of a linkage locking section and a debugging extension section which are integrated and coaxially connected.

[0019] Preferably, four through holes are arranged on the chassis along the circumference to facilitate the rotation operation of the chassis.

[0020] Before debugging, install the inner core assembly into the shell. During debugging, do not install the compression screw plug first. Insert the front end of the debugging extension section of the hexagonal column on the linkage locking body into the hexagonal hole of the plunger, operate the chassis to rotate, and adjust the plunger to a suitable axial position. After the flow test is in place, remove the linkage locking body, cut off the debugging extension section on the linkage locking body through the cutting equipment, and then put the butterfly spring assembly on the outer hexagon of the plunger seat, and then install the linkage locking body, sealing gasket and compression screw plug in sequence, so that the linkage locking body is located between the compression screw plug and the plunger seat, and the front end of a linkage locking section of the hexagonal column on the linkage locking body is positioned in the hexagonal hole of the plunger, and at the same time, the hexagonal hole of the positioning ring on the linkage locking body is sleeved on the outer hexagon of the plunger seat, the front end of the positioning ring on the linkage locking body presses the butterfly spring assembly, tightens the compression screw plug, and completes the debugging of the plunger orifice plate.

[0021] Since the linkage locking integrated debugging tool has a linkage locking effect, the linkage locking body will not rotate or shift during the process of tightening the compression screw plug, thereby ensuring that the axial position of the plunger remains unchanged and playing a joint anti-loosening role for the plunger seat and the plunger.

[0022] The beneficial effects of the present invention are:

[0023] First, the present invention provides an improved structure of a high-pressure fluid plunger orifice plate that can reduce internal leakage. The outer conical surface at the front end of the plunger seat is pressed against the conical chamfer of the shell. Since the conical chamfer can be designed to be a chamfer of smaller size, on the basis of the conical surface sealing structure, the pressure of the outer conical surface at the front end of the plunger seat can also cause a slight extrusion deformation of the conical chamfer of the shell, thereby enhancing the sealing performance between the outer conical surface at the front end of the plunger seat and the conical chamfer of the shell. This can greatly reduce the internal leakage of the high-temperature and high-pressure fluid plunger orifice plate, thereby improving the flux accuracy of the plunger orifice plate and the reliability of the plunger orifice plate.

[0024] Secondly, the present invention provides an improved structure of a high-pressure fluid plunger orifice plate that can reduce the amount of internal leakage. The improved structure has a matching structure between the plunger and the plunger seat, and the throttling hole is set on the plunger seat, so that the outer diameter of the plunger can be designed to be smaller, which is beneficial to reducing the nominal size of the plunger and the plunger seat in the diameter direction, so that the plunger and the plunger seat have a smaller matching clearance under the same manufacturing tolerance grade, thereby reducing the amount of internal leakage between the plunger and the plunger seat, thereby further improving the flux accuracy of the plunger orifice plate and improving the reliability of the plunger orifice plate.

[0025] Third, the present invention provides an improved structure of a high-pressure fluid plunger orifice plate that can reduce internal leakage. The matching structure of the plunger and the plunger seat of the improved structure enables more throttling holes to be axially arranged on the plunger seat according to design requirements, thereby improving the adaptability of the high-pressure fluid plunger orifice plate.

[0026] Fourth, an improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage of the present invention is equipped with a linkage locking integrated debugging tool. In addition to being a debugging tool for debugging the axial position of the plunger in the plunger orifice plate, the linkage locking integrated debugging tool can also be installed inside the plunger orifice plate as a part of the plunger orifice plate product after the debugging is completed and the debugging section at one end of the hexagonal column is cut off. The linkage locking of the plunger seat and the plunger is achieved by utilizing the hexagonal column on the linkage locking body and the inner hexagonal hole of the positioning ring, in conjunction with the axial tightening action of the butterfly spring assembly, so that the inner core assembly inside the plunger orifice plate will not shift under harsh environments such as high temperature, high pressure and vibration in the nuclear power field, thereby enhancing the safety and reliability of the application of the plunger orifice plate in the nuclear power field. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage of the present invention;

[0028] Figure 2 is Figure 1 On the basis of the above, a structural diagram after setting up the linkage locking integrated debugging tool is added;

[0029] Figure 3 yes Figure 2 Schematic diagram of the structure of the linkage locking body.

[0030] In the figure: 1, shell, 2, inner core component, 3, first internal threaded hole, 4, first channel hole, 5, second channel hole, 6, conical chamfer, 7, third channel hole, 8, plunger seat, 9, plunger, 10, threaded sleeve, 11, light hole sleeve, 12, throttle hole, 13, stud, 14, cylinder, 15, outer cone, 16, second internal threaded hole, 17, clamping screw plug, 18, sealing gasket, 19, third internal threaded hole, 20, fourth internal threaded hole, 21, annular gap, 22, hexagonal hole, 23, outer hexagon, 24, linkage locking body, 25, butterfly spring assembly, 26, chassis, 27, hexagonal column, 28, positioning ring, 29, hexagonal hole, 30, linkage locking section, 31, debugging extension section, 32, through hole. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0032] like Figures 1 to 3The embodiment of the improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage of the present invention is shown, comprising a shell 1 and an inner core component 2 arranged in the shell 1, wherein the shell 1 is coaxially provided with a first internal threaded hole 3, a first channel hole 4 and a second channel hole 5 which are connected in sequence along the longitudinal direction, and the aperture of the first internal threaded hole 3 is larger than the aperture of the first channel hole 4, the aperture of the first channel hole 4 is larger than the aperture of the second channel hole 5, and a conical chamfer 6 is provided at the aperture position of the step surface adjacent to the first channel hole 4 on the second channel hole 5; the shell 1 is transversely provided with a third channel hole 7 which is connected with the first channel hole 4; the inner core component 2 comprises a plunger seat 8 and a plunger 9 arranged in the plunger seat 8, the plunger seat 8 comprises a section of threaded sleeve 10 and a section of smooth hole sleeve 11 which are adjacently connected in the axial direction, the threaded sleeve 10 is coaxially provided with an external thread and an internal threaded hole, and the smooth hole sleeve 11 is coaxially provided with The outer circle and the inner hole, and the outer circle of the light hole sleeve 11 is provided with N pairs of throttling holes 12 connected with the inner hole of the light hole sleeve 11 at intervals; the plunger 9 includes a section of stud 13 and a section of cylinder 14 connected axially adjacent to each other; the light hole sleeve 11 part of the plunger seat 8 is installed in the first channel hole 4 of the housing, the outer thread of the threaded sleeve 10 part of the plunger seat 8 is threadedly connected with the first internal threaded hole 3 of the housing 1, the cylinder 14 part of the plunger 9 is installed in the inner hole of the light hole sleeve 11 of the plunger seat 8 and is slidably connected with the inner hole of the light hole sleeve 11, and the stud 13 part of the plunger 9 is threadedly connected with the internal threaded hole of the threaded sleeve 10 part of the plunger seat 8; an outer conical surface 15 is coaxially provided at the front end of the outer circle of the light hole sleeve 11 of the plunger seat 8, and the outer conical surface 15 of the front end of the outer circle of the light hole sleeve 11 is pressed and connected to the surface of the conical chamfer 6 of the housing 1 to form a sealed connection with the conical chamfer 6.

[0033] In this embodiment, a second internal threaded hole 16 is further provided on the shell body 1 at one end close to the first internal threaded hole 3, the aperture of the second internal threaded hole 16 is larger than the aperture of the first internal threaded hole 3, a clamping screw plug 17 is installed in the second internal threaded hole 16, and a sealing gasket 18 is provided at the front end of the clamping screw plug 17, and the sealing gasket 18 is pressed on the step surface adjacent to the second internal threaded hole 16 and the first internal threaded hole 3.

[0034] In this embodiment, a third internal threaded hole 19 connected to the third channel hole 7 is provided on the shell 1 at the outer end of the third channel hole 7, and a fourth internal threaded hole 20 connected to the second channel hole 5 is provided on the shell 1 at the outer end of the second channel hole 5; the aperture of the third internal threaded hole 19 is larger than the aperture of the third channel hole 7, and the aperture of the fourth internal threaded hole 20 is larger than the aperture of the second channel hole 5.

[0035] Preferably, an annular gap 21 for high-pressure fluid to enter is provided between the first channel hole 4 of the housing 1 and the outer circle of the light hole sleeve 11 of the plunger seat 8 .

[0036] Preferably, there are three pairs of throttling holes 12 , and the three pairs of throttling holes 12 are arranged to penetrate transversely along the light hole sleeve 11 of the plunger seat 8 .

[0037] In this embodiment, a hexagonal hole 22 is provided at one end of the cylindrical portion 14 of the plunger 9 .

[0038] In this embodiment, one end of the threaded sleeve 10 of the plunger seat 8 is further provided with an external hexagonal portion 23 .

[0039] Preferably, the length of the conical chamfer 6 on the housing 1 is 1 mm, and the chamfer angle is 45°.

[0040] Preferably, the sealing gasket 18 is a graphite stainless steel composite gasket, which includes a stainless steel gasket and graphite gaskets integrally connected to both sides of the stainless steel gasket.

[0041] In this embodiment, the pressure of the high-pressure fluid is 8-15 MPa.

[0042] Preferably, the high-pressure fluid is high-temperature and high-pressure gas.

[0043] As a further improvement, an improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage of the present invention is also equipped with a linkage locking integrated debugging tool, the linkage locking integrated debugging tool includes a linkage locking body 24 and a butterfly spring assembly 25, the linkage locking body 24 includes a chassis 26, a hexagonal column 27 arranged at the center position of the front side of the chassis 26, a positioning ring 28 arranged on the front side of the chassis 26 and coaxial with the hexagonal column 27, and an inner hexagonal hole 29 arranged on the positioning ring 28; wherein, the shape and size of the hexagonal column 27 are adapted to the shape and size of the inner hexagonal hole 22 on the plunger 9, and the inner hexagonal hole 29 on the positioning ring 28 is adapted to the shape and size of the outer hexagon 23 on the plunger seat 8; wherein, the hexagonal column 27 is composed of a linkage locking section 30 and a debugging extension section 31 which are integrated and coaxially connected.

[0044] Preferably, four through holes 32 are provided on the chassis 26 along the circumferential direction to facilitate the rotation operation of the chassis.

[0045] Before debugging, install the inner core assembly 2 into the housing 1. During debugging, do not install the compression screw plug 17 first. Insert the front end of the debugging extension section of the hexagonal column 27 on the linkage locking body 24 into the inner hexagonal hole 22 of the plunger 9. Rotate the operating chassis 26 to adjust the plunger 9 to a suitable axial position. After the flow test is in place, remove the linkage locking body 24, cut off the debugging extension section 31 on the linkage locking body 24 through a cutting device, and then put the butterfly spring assembly 25 on the outer hexagon 23 of the plunger seat 8, and then install the linkage locking body 24, The sealing gasket 18 and the clamping screw 17 make the linkage locking body 24 located between the clamping screw 17 and the plunger seat 8, and the front end of a linkage locking section 30 of the hexagonal column 27 on the linkage locking body 24 is positioned in the inner hexagonal hole 22 of the plunger 9, and at the same time, the inner hexagonal hole 29 of the positioning ring 28 on the linkage locking body 24 is sleeved on the outer hexagon 23 of the plunger seat 8, the front end of the positioning ring 28 on the linkage locking body 24 presses the butterfly spring assembly 25, and the clamping screw 17 is tightened to complete the debugging of the plunger orifice plate.

[0046] Since the interlocking locking integrated debugging tool has an interlocking locking function, the interlocking locking body 24 will not rotate or shift during the process of tightening the compression screw 17, thereby ensuring that the axial position of the plunger 9 remains unchanged and playing a joint anti-loosening role for the plunger seat 8 and the plunger 9.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage, It is characterized in that The invention comprises a shell and an inner core component arranged in the shell, wherein the shell is coaxially provided with a first internal threaded hole, a first channel hole and a second channel hole which are connected in sequence along the longitudinal direction, and the aperture of the first internal threaded hole is larger than the aperture of the first channel hole, the aperture of the first channel hole is larger than the aperture of the second channel hole, and a conical chamfer is arranged at the aperture position of the step surface adjacent to the first channel hole on the second channel hole; a third channel hole which is connected to the first channel hole is arranged transversely on the shell; the inner core component comprises a plunger seat and a plunger arranged in the plunger seat, the plunger seat comprises a section of threaded sleeve and a section of light hole sleeve which are adjacent to each other in the axial direction, the threaded sleeve is coaxially provided with an external thread and an internal threaded hole, the light hole sleeve is coaxially provided with an outer circle and an inner hole, and the N pairs of throttling holes connected to the inner hole of the light hole sleeve are arranged at intervals on the outer circle of the light hole sleeve; the plunger includes a section of stud and a section of cylinder connected axially adjacent to each other; the light hole sleeve part of the plunger seat is installed in the first channel hole of the shell, the external thread of the threaded sleeve part of the plunger seat is threadedly connected with the first internal threaded hole of the shell, the cylindrical part of the plunger is installed in the inner hole of the light hole sleeve of the plunger seat and is slidably connected with the inner hole of the light hole sleeve, and the stud part of the plunger is threadedly connected with the internal threaded hole of the threaded sleeve part of the plunger seat; an outer conical surface is coaxially arranged at the front end of the outer circle of the light hole sleeve of the plunger seat, and the outer conical surface of the front end of the outer circle of the light hole sleeve is pressed and connected to the conical chamfered surface of the shell to form a sealed connection with the conical chamfer; A second internally threaded hole is further provided on the housing at one end close to the first internally threaded hole, the aperture of the second internally threaded hole is larger than the aperture of the first internally threaded hole, a compression screw plug is installed in the second internally threaded hole, a sealing gasket is provided at the front end of the compression screw plug, and the sealing gasket is pressed on a step surface located adjacent to the second internally threaded hole and the first internally threaded hole; A linkage locking integrated debugging tool is also provided, which includes a linkage locking body and a butterfly spring assembly, wherein the linkage locking body includes a chassis, a hexagonal column arranged at the center of the front side of the chassis, a positioning ring arranged at the front side of the chassis and coaxial with the hexagonal column, and an inner hexagonal hole arranged on the positioning ring; wherein the shape and size of the hexagonal column are matched with the shape and size of the inner hexagonal hole on the plunger, and the inner hexagonal hole on the positioning ring is matched with the shape and size of the outer hexagon on the plunger seat; wherein the hexagonal column is composed of a linkage locking section and a debugging extension section which are coaxially connected in an integrated manner.

2. An improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage according to claim 1, It is characterized in that A third internal threaded hole connected to the third channel hole is provided on the shell at the outer end of the third channel hole, and a fourth internal threaded hole connected to the second channel hole is provided on the shell at the outer end of the second channel hole; the aperture of the third internal threaded hole is larger than the aperture of the third channel hole, and the aperture of the fourth internal threaded hole is larger than the aperture of the second channel hole.

3. An improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage according to claim 1, It is characterized in that An annular gap for high-pressure fluid to enter is arranged between the first channel hole of the housing and the outer circle of the light hole sleeve of the plunger seat.

4. An improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage according to claim 1, It is characterized in that There are three pairs of throttling holes, and the three pairs of throttling holes are arranged transversely through the light hole sleeve of the plunger seat.

5. The improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage according to claim 1, It is characterized in that One end of the cylindrical part of the plunger is provided with a hexagonal hole.

6. An improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage according to claim 1, It is characterized in that One end of the threaded sleeve of the plunger seat is also provided with an external hexagonal portion.

7. An improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage according to claim 1, It is characterized in that The length of the conical chamfer on the shell is 1 mm, and the angle of the chamfer is 45°.

8. An improved structure of a high-pressure fluid plunger orifice plate capable of reducing internal leakage according to claim 1, It is characterized in that Before debugging, install the inner core assembly into the shell. During debugging, do not install the compression screw plug first. Insert the front end of the debugging extension section of the hexagonal column on the linkage locking body into the hexagonal hole of the plunger, operate the chassis to rotate, and adjust the plunger to a suitable axial position. After the flow test is in place, remove the linkage locking body, cut off the debugging extension section on the linkage locking body through the cutting equipment, and then put the butterfly spring assembly on the outer hexagon of the plunger seat, and then install the linkage locking body, sealing gasket and compression screw plug in sequence, so that the linkage locking body is located between the compression screw plug and the plunger seat, and the front end of a linkage locking section of the hexagonal column on the linkage locking body is positioned in the hexagonal hole of the plunger, and at the same time, the hexagonal hole of the positioning ring on the linkage locking body is sleeved on the outer hexagon of the plunger seat, the front end of the positioning ring on the linkage locking body presses the butterfly spring assembly, tightens the compression screw plug, and completes the debugging of the plunger orifice plate.

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