Ultra-high pressure pump core with axial displacement monitoring function

Abstract

The present invention provides an ultra-high-pressure pump core with axial displacement monitoring capabilities, comprising a main shaft, a front cover, a disc spring, a thrust ball bearing, a plane bearing spacer, an end cover side spacer, a bearing side spacer, a cylindrical roller bearing assembly, a swash plate, and a rear cover. The front cover and rear cover are connected to the first and second mounting ends of the main shaft, respectively. The disc spring is connected to the third mounting end of the main shaft. The inner ring of the thrust ball bearing is connected to the fourth mounting end of the main shaft. The outer ring of the thrust ball bearing contacts the disc spring sleeve and one end surface of the plane bearing spacer, respectively. The end cover side spacer is connected to the first end of the bearing side spacer, the second end of the bearing side spacer is connected to the outer ring of the cylindrical roller bearing assembly, the inner ring of the cylindrical roller bearing assembly is connected to the eighth mounting end of the main shaft, and the central portion of the main shaft is connected to the swash plate. When operating under harsh operating conditions, the disc spring and thrust ball bearing buffer the axial forces acting on the main shaft, absorbing vibration and impact energy from the pump body and alleviating stress concentration on the main shaft.

Description

Technical Field

[0001] The present invention relates to the field of ultra-high pressure hydraulic pumps, and in particular to an ultra-high pressure pump core with a function of monitoring axial displacement. Background Art

[0002] Plunger pumps are widely used in hydraulic systems due to their high rated pressure, compact structure, high efficiency, and convenient flow regulation. As the core power component of ultra-high pressure hydraulic transmission systems, their performance directly affects the performance of ultra-high pressure hydraulic systems. However, in actual use, traditional plunger pumps have the following problems:

[0003] Under ultra-high pressure conditions, the fluid-solid-thermal multi-field coupling effect will be enhanced inside the plunger pump, making it difficult to evaluate the pump's real-time performance.

[0004] Under ultra-high pressure conditions, the plunger pump will experience harsh working conditions such as high load, high speed, and high temperature. At this time, the axial force acting on the main shaft increases, the axial displacement of the main shaft increases accordingly, the vibration of the pump body increases, and the stress concentration phenomenon of the main shaft is obvious. Summary of the Invention

[0005] In response to the problems existing in the prior art, the present invention provides an ultra-high pressure pump core with the function of monitoring axial displacement. By arranging a sensor on the rear cover using a sensor holder, the axial displacement of the main shaft is monitored in real time, and the real-time evaluation of the pump performance is completed through the transmitted real-time axial displacement; at the same time, disc springs and thrust ball bearings are arranged on the front cover and the rear cover to buffer the axial force acting on the main shaft, absorb the vibration and impact energy of the pump body, alleviate the stress concentration phenomenon of the main shaft, and utilize the disc spring sleeve to limit the concentricity of the disc spring and the thrust ball bearing loose ring, thereby avoiding contact wear between the disc spring and the thrust ball bearing and the main shaft, and improving the service life of the main shaft.

[0006] The present invention provides an ultra-high pressure pump core with the function of monitoring axial displacement, which includes a main shaft, a front cover, a disc spring sleeve, a disc spring, a thrust ball bearing, a plane bearing spacer, an end cover side spacer, a sealing ring, a combined sealing ring, a bearing side spacer, a locking nut, a cylindrical roller bearing assembly, a swash plate, a flat key and a rear cover. The middle mounting ends of the front cover and the rear cover are respectively connected to the first mounting end and the second mounting end of the main shaft, the disc spring is located inside the disc spring sleeve, the mounting end of the disc spring is connected to the third mounting end of the main shaft, the inner ring of the thrust ball bearing is connected to the fourth mounting end of the main shaft, the end faces of both sides of the thrust ball bearing are respectively in contact with the disc spring and one end face of the plane bearing spacer, the outer ring of the plane bearing spacer is connected to the first end of the end cover side spacer, the inner ring of the plane bearing spacer is connected to the fifth mounting end of the main shaft, the disc spring and the thrust ball bearing will buffer the axial force acting on the main shaft, thereby reducing the stress concentration phenomenon at the main shaft shoulder and absorbing the vibration and impact energy of the pump body. The combined sealing ring is located inside the end cover side spacer ring, the mounting end of the combined sealing ring is connected to the sixth mounting end of the main shaft, the second end of the end cover side spacer ring is connected to the first end of the bearing side spacer ring through the sealing ring, the locking nut is located inside the bearing side spacer ring, the locking nut is connected to the seventh mounting end of the main shaft, the second end of the bearing side spacer ring is connected to the outer ring of the cylindrical roller bearing assembly, and the inner ring of the cylindrical roller bearing assembly is connected to the eighth mounting end of the main shaft. The middle part of the main shaft is connected to the middle part of the swash plate through a flat key, and the fixed end of the swash plate is fixedly connected to one side of the middle part of the main shaft through a swash plate locking nut. The disc spring sleeve, the disc spring, the thrust ball bearing, the plane bearing spacer ring, the end cover side spacer ring, the sealing ring, the combined sealing ring, the bearing side spacer ring and the cylindrical roller bearing assembly are symmetrically distributed on both sides of the main shaft. From the end to the middle of the main shaft, the disc spring, the thrust ball bearing, the plane bearing spacer ring, the end cover side spacer ring, the combined sealing ring, the sealing ring, the bearing side spacer ring and the cylindrical roller bearing assembly are distributed in sequence.

[0007] Preferably, the sensor is connected to the fixed end of the rear cover via a sensor holder, and the sensor monitors the axial displacement of the main shaft in real time during the operation of the pump, thereby making a real-time evaluation of the performance of the pump.

[0008] Preferably, the axes of the disc spring and the disc spring sleeve are on the same straight line.

[0009] Preferably, the axes of the combined sealing ring and the end cover side spacer ring are on the same straight line.

[0010] Preferably, the swash plate is a cylinder with variable thickness.

[0011] Preferably, the axes of the main shaft, the front cover, the rear cover, the swash plate, the sensor support, the disc spring, the thrust ball bearing, the plane bearing spacer, the end cover side spacer, the sealing ring, the combined sealing ring, the bearing side spacer and the cylindrical roller bearing assembly are on the same straight line.

[0012] Preferably, the number of the disc spring sleeve, the disc spring, the thrust ball bearing, the plane bearing spacer, the end cover side spacer, the sealing ring, the combined sealing ring, the bearing side spacer and the cylindrical roller bearing assembly is two.

[0013] Preferably, the front cover and the rear cover are respectively located at the outermost mounting ends on both sides of the main shaft.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The present invention has non-standard disc springs and thrust ball bearings symmetrically arranged on both sides of the main shaft. Under severe working conditions during the operation of the ultra-high pressure pump, they can buffer the axial force acting on the main shaft, absorb the vibration and impact energy of the pump body, alleviate the stress concentration phenomenon of the main shaft, and improve the performance and life of the pump.

[0016] 2. By arranging a sensor at the rear cover of the main shaft, the present invention can monitor the axial displacement of the main shaft in real time during the operation of the ultra-high pressure pump, and export and process this data, so as to evaluate the real-time performance of the ultra-high pressure pump during operation based on the axial displacement of the main shaft. When the monitored main shaft displacement exceeds the safe range, the sensor sends an emergency stop signal to the entire machine, thereby improving the safety performance of the ultra-high pressure pump.

[0017] 3. The present invention realizes the sealing between the sleeve and the main shaft through the combined seal, and realizes the sealing between the sleeve and the ultra-high pressure pump cylinder through the sealing ring. The sealing position is far away from the end cover, thereby improving the cleanliness of the pump.

[0018] 4. The present invention adopts a sleeve to limit the concentricity of the disc spring and the loose ring of the thrust ball bearing, thereby avoiding contact wear between the disc spring and the thrust ball bearing and the main shaft, and improving the service life of the main shaft.

[0019] 5. In the present invention, the sleeve, thrust ball bearing, sealing ring and cylindrical roller bearing are all symmetrically distributed, with fewer types of parts, which is conducive to the disassembly, assembly and maintenance of the entire pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a pump core of an ultra-high pressure pump having the function of monitoring axial displacement according to the present invention;

[0021] Figure 2 A half-section isometric view of the pump core of the ultra-high pressure pump with the function of monitoring axial displacement according to the present invention;

[0022] Figure 3 This is an axonometric view of the pump core of the ultra-high pressure pump with the function of monitoring axial displacement of the present invention.

[0023] Main reference numerals:

[0024] Main shaft 1, front cover 2, first disc spring sleeve 3, first disc spring 4, first thrust ball bearing 5, first plane bearing spacer 6, first end cover side spacer 7, first sealing ring 8, first combined sealing ring 9, first bearing side spacer 10, first locking nut 11, first cylindrical roller bearing assembly 12, swash plate locking nut 13, swash plate 14, flat key 15, second cylindrical roller bearing assembly 16, second locking nut 17, second bearing side spacer 18, second sealing ring 19, second combined sealing ring 20, second end cover side spacer 21, second plane bearing spacer 22, second thrust ball bearing 23, second disc spring sleeve 24, second disc spring 25, rear cover 26, sensor support 27, sensor 28. DETAILED DESCRIPTION

[0025] To fully describe the technical content, structural features, objectives and effects of the present invention, the following is a detailed description with reference to the accompanying drawings.

[0026] The present invention is an ultra-high pressure pump core with the function of monitoring axial displacement. The term ultra-high pressure is usually used in hydraulic engineering to refer to working pressures exceeding 32MPa. In the ultra-high pressure range, the most commonly used pressure is 63-80MPa, and hydraulic pumps with this pressure level are called ultra-high pressure pumps. Figures 1 to 3 As shown, the assembly includes a main shaft 1, a front cover 2, a first disc spring sleeve 3, a first disc spring 4, a first thrust ball bearing 5, a first plane bearing spacer 6, a first end cover side spacer 7, a first sealing ring 8, a first combined sealing ring 9, a first bearing side spacer 10, a first locking nut 11, a first cylindrical roller bearing assembly 12, a swash plate locking nut 13, a swash plate 14, a flat key 15, a second cylindrical roller bearing assembly 16, a second locking nut 17, a second bearing side spacer 18, a second sealing ring 19, a second combined sealing ring 20, a second end cover side spacer 21, a second plane bearing spacer 22, a second thrust ball bearing 23, a second disc spring sleeve 24, a second disc spring 25, a rear cover 26, a sensor support 27, and a sensor 28. Preferably, the swash plate 14 is a cylinder with variable thickness.

[0027] like Figure 2As shown, the middle mounting ends of the front cover 2 and the rear cover 26 are respectively connected to the first mounting end and the second mounting end of the main shaft 1 , and the front cover 2 and the rear cover 26 are respectively located at the outermost mounting ends on both sides of the main shaft 1 . The first disc spring 4 and the second disc spring 25 are respectively located inside the first disc spring sleeve 3 and the second disc spring sleeve 24, and the mounting ends of the first disc spring 4 and the second disc spring 25 are respectively connected to the third mounting end on the left side and the third mounting end on the right side of the main shaft 1, and the inner rings of the first thrust ball bearing 5 and the second thrust ball bearing 23 are respectively connected to the fourth mounting end on the left side and the fourth mounting end on the right side of the main shaft 1, and the end faces of the first thrust ball bearing 5 are respectively in contact with the first disc spring 4 and one end face of the first plane bearing spacer 6, and the end faces of the second thrust ball bearing 23 are respectively in contact with one end face of the second disc spring 25 and the second plane bearing spacer 22, and the outer rings of the first plane bearing spacer 6 and the second plane bearing spacer 22 are respectively connected to the first ends of the first end cover side spacer 7 and the second end cover side spacer 21, and the inner rings of the first plane bearing spacer 6 and the second plane bearing spacer 22 are respectively in contact with the fifth mounting end on the left side and the fifth mounting end on the right side of the main shaft 1.

[0028] The disc spring and thrust ball bearing will buffer the axial force acting on the main shaft 1, thereby reducing the stress concentration phenomenon at the shoulder of the main shaft 1 and absorbing the vibration and impact energy of the pump body. The first thrust ball bearing 5 is axially constrained under the joint action of the first plane bearing spacer ring 6 and the first disc spring 4, and the second thrust ball bearing 23 is axially constrained under the joint action of the second plane bearing spacer ring 22 and the second disc spring 25.

[0029] like Figure 1 and Figure 2 As shown, the first combined sealing ring 9 and the second combined sealing ring 20 respectively play a sealing role. The first combined sealing ring 9 and the second combined sealing ring 20 are respectively located inside the first end cover side spacer ring 7 and the second end cover side spacer ring 21. The mounting ends of the first combined sealing ring 9 and the second combined sealing ring 20 are respectively connected to the sixth mounting end on the left and the sixth mounting end on the right of the main shaft 1. The second ends of the first end cover side spacer ring 7 and the second end cover side spacer ring 21 are respectively connected to the first ends of the first bearing side spacer ring 10 and the second bearing side spacer ring 18 through the first sealing ring 8 and the second sealing ring 19. The first locking nut 11 and the second locking nut 17 are located inside the first bearing side spacer ring 10 and the second bearing side spacer ring 18. The first locking nut 11 and the second locking nut 17 are connected to the seventh mounting end on the left and the seventh mounting end on the right of the main shaft 1.

[0030] The second ends of the first and second bearing-side spacer rings 10 and 18 are connected to the outer rings of the first and second cylindrical roller bearing assemblies 12 and 16, respectively. The inner rings of the first and second cylindrical roller bearing assemblies 12 and 16 are connected to the eighth mounting end of the main shaft 1. The first locking nut 11 and the shoulder of the main shaft 1 axially secure the first cylindrical roller bearing assembly 12, while the second locking nut 17 and the shoulder of the main shaft 1 axially secure the second cylindrical roller bearing assembly 16. The central portion of the main shaft 1 is connected to the central portion of the swash plate 14 via a flat key 15. The fixed end of the swash plate 14 is fixed to one side of the central portion of the main shaft 1 via a swash plate locking nut 13. The swash plate locking nut 13 axially secures the swash plate 14. The mechanical fit between the flat key 15 and the swash plate 14 transmits motion and torque. The swash plate 14 is axially constrained by the swash plate locking nut 13 and the shoulder of the main shaft 1.

[0031] like Figure 1 As shown, specifically, the number of disc spring sleeves, disc springs, thrust ball bearings, plane bearing spacers, end cover side spacers, sealing rings, combined sealing rings, bearing side spacers and cylindrical roller bearing assemblies are all two. The first disc spring sleeve 3, the first disc spring 4, the first thrust ball bearing 5, the first plane bearing spacer 6, the first end cover side spacer 7, the first sealing ring 8, the first combined sealing ring 9, the first bearing side spacer 10, the first locking nut 11 and the first cylindrical roller bearing assembly 12 and the second disc spring sleeve 24, the second disc spring 25, the second thrust ball bearing 23, the second plane bearing spacer 22, the second end cover side spacer 21, the second sealing ring 19, the second combined sealing ring 20, the second bearing side spacer 18, the second locking nut 17 and the second cylindrical roller bearing assembly 16 are symmetrically distributed on both sides of the main shaft 1; from the first side of the main shaft 1 to the middle direction. The first disc spring sleeve 3, the first disc spring 4, the first thrust ball bearing 5, the first plane bearing spacer 6, the first end cover side spacer 7, the first combined sealing ring 9, the first sealing ring 8, the first bearing side spacer 10, the first locking nut 11 and the first cylindrical roller bearing assembly 12 are distributed in sequence; from the second side to the middle of the main shaft 1, the second disc spring sleeve 24, the second disc spring 25, the second thrust ball bearing 23, the second plane bearing spacer 22, the second end cover side spacer 21, the second combined sealing ring 20, the second sealing ring 19, the second bearing side spacer 18, the second locking nut 17 and the second cylindrical roller bearing assembly 16 are distributed in sequence.

[0032] The sensor 28 is connected to the fixed end of the rear cover 26 via the sensor support 27 . The sensor 28 monitors the axial displacement of the main shaft 1 in real time during the operation of the pump, thereby making a real-time evaluation of the performance of the pump.

[0033] The axes of the first disc spring sleeve 3 and the first disc spring 4 are on the same straight line, and the axes of the second disc spring sleeve 24 and the second disc spring 25 are on the same straight line; the axes of the first combined sealing ring 9 and the first end cover side spacer ring 7 are on the same straight line, and the axes of the second combined sealing ring 20 and the second end cover side spacer ring 21 are on the same straight line.

[0034] like Figure 3 As shown, the axes of the main shaft 1, the front cover 2, the rear cover 26, the swash plate 14, the sensor support 27, the first disc spring sleeve 3, the first disc spring 4, the first thrust ball bearing 5, the first plane bearing spacer 6, the first end cover side spacer 7, the first sealing ring 8, the first combined sealing ring 9, the first bearing side spacer 10, the first locking nut 11, the first cylindrical roller bearing assembly 12, the second disc spring sleeve 24, the second disc spring 25, the second thrust ball bearing 23, the second plane bearing spacer 22, the second end cover side spacer 21, the second sealing ring 19, the second combined sealing ring 20, the second bearing side spacer 18, the second locking nut 17 and the second cylindrical roller bearing assembly 16 are on the same straight line.

[0035] When harsh working conditions such as high load, high speed and high temperature occur inside the ultra-high pressure pump, the main shaft 1 and the swash plate 14 will be subjected to a large axial force, and the main shaft 1 will have an axial displacement. The axial displacement of the entire main shaft is collected by the sensor 28 on the sensor support 27 at this time, and the performance of the ultra-high pressure pump is evaluated in real time based on the collected data. The first disc spring 4 and the first thrust ball bearing 5 and the second disc spring 25 and the second thrust ball bearing 23 will buffer the axial force acting on the main shaft 1, thereby reducing the stress concentration phenomenon of the main shaft 1 at the shaft shoulder and absorbing the vibration and impact energy of the pump body.

[0036] The following is a further description of an ultra-high pressure pump core with an axial displacement monitoring function according to the present invention in conjunction with an embodiment:

[0037] The UHP pump core is one of its core components. Its design significantly impacts its performance and lifespan. Bolted to the end faces of both sides of the pump, the core is generally symmetrically arranged. During operation, external power drives the main shaft 1, which in turn drives the swash plate 14 via a key 15. The symmetrically arranged swash plate 14 drives the reciprocating motion of the plungers on both sides, completing the oil suction and discharge operations.

[0038] The swash plate 14 is secured to the main shaft 1 via a swash plate lock nut 13 and a flat key 15, effectively preventing loosening of the swash plate 14 and improving the safety of the entire pump. The main shaft 1, front cover 2, and rear cover 26 are connected by a first disc spring 4, a first thrust ball bearing 5, a first planar bearing spacer 6, a second disc spring 25, a second thrust ball bearing 23, and a second planar bearing spacer 22, respectively. This elastic contact allows the main shaft 1 to accommodate a certain amount of axial displacement. The first disc spring 4 and the main shaft 1, as well as the second disc spring 25 and the main shaft 1, are connected by a first thrust ball bearing 5 and a second thrust ball bearing 23, respectively. The inner rings of the first and second thrust ball bearings 5 and 23 rotate with the main shaft 1, while the outer rings of the first and second thrust ball bearings 5 and 23 are fixed relative to the first disc spring 4 and the second disc spring 25, respectively, preventing frictional contact between the main shaft 1 and the wall. The first and second planar bearing spacers 6 and 22 can be adjusted to accommodate installation of different hydraulic pump types based on the overall pump size.

[0039] The pump core uses symmetrical first and second cylindrical roller bearing assemblies 12 and 16 to withstand the radial unbalanced force of the main shaft 1 during operation. The main shaft 1 is connected to the entire pump using first and second sealing rings 8 and 19. The main shaft 1 and the spacer ring are sealed using first and second combined sealing rings 9 and 20. The sealed ends are away from the end cover, preventing oil from seeping out of the outer wall of the entire pump and improving the cleanliness of the entire pump. The pump core uses multiple spacer rings to protect the sealing rings and cylindrical roller bearing assemblies. The first and second cylindrical roller bearing assemblies 12 and 16 have spindle steps and lock nuts on the inside to limit axial displacement, respectively. The outer sides use bearing-side spacers to limit the position of one side. The other side and the end cover-side spacer ring use hole retaining rings or cylinder hole steps to limit axial displacement. During operation, there is a certain amount of oil pressure inside the pump core. The oil pressure causes the combined sealing ring to adhere closely to the end cover-side spacer ring, avoiding contact friction on non-sealing surfaces and extending the service life of the cylindrical roller bearing assembly and combined sealing ring.

[0040] A sensor bracket 27 is provided on the rear cover 26 to fix the sensor 28. The sensor 28 can detect the axial displacement of the main shaft 1 and transmit the signal to the control end. The test curve can intuitively display the performance and usage status of the entire pump. When the axial displacement of the main shaft 1 exceeds the limit value, the entire pump is controlled to shut down, thereby improving the safety of the entire pump.

[0041] When harsh working conditions such as high load, high speed, and high temperature occur inside the ultra-high pressure pump, the main shaft 1 and the swash plate 14 will be subjected to unbalanced axial forces, resulting in axial displacement. At this time, the disc springs on both sides of the main shaft 1 can buffer the axial force and absorb a certain axial displacement of the main shaft, avoiding the instantaneous unbalanced force from being transmitted to the entire pump to cause safety problems. The sensor 28 monitors the axial displacement of the main shaft 1 in real time. When the detection value exceeds the limit value, a signal is transmitted to shut down the entire pump.

[0042] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A pump core of an ultra-high pressure pump with the function of monitoring axial displacement, comprising a main shaft, a front cover, a disc spring sleeve, a disc spring, a thrust ball bearing, a plane bearing spacer, an end cover side spacer, a sealing ring, a combined sealing ring, a bearing side spacer, a locking nut, a cylindrical roller bearing assembly, a swash plate, a flat key and a rear cover, characterized in that: The middle mounting ends of the front cover and the rear cover are respectively connected to the first mounting end and the second mounting end of the main shaft, the disc spring is located inside the disc spring sleeve, the mounting end of the disc spring is connected to the third mounting end of the main shaft, the inner ring of the thrust ball bearing is connected to the fourth mounting end of the main shaft, the end faces of both sides of the thrust ball bearing are respectively in contact with the disc spring and one end face of the plane bearing spacer, the outer ring of the plane bearing spacer is connected to the first end of the end cover side spacer, the inner ring of the plane bearing spacer is connected to the fifth mounting end of the main shaft, the disc spring and the thrust ball bearing will buffer the axial force acting on the main shaft, thereby reducing the stress concentration phenomenon at the main shaft shoulder and absorbing the vibration and impact energy of the pump body; The combined sealing ring is located inside the end cover side spacer ring, the mounting end of the combined sealing ring is connected to the sixth mounting end of the main shaft, the second end of the end cover side spacer ring is connected to the first end of the bearing side spacer ring through the sealing ring, the locking nut is located inside the bearing side spacer ring, the locking nut is connected to the seventh mounting end of the main shaft, the second end of the bearing side spacer ring is connected to the outer ring of the cylindrical roller bearing assembly, and the inner ring of the cylindrical roller bearing assembly is connected to the eighth mounting end of the main shaft; The middle part of the main shaft is connected to the middle part of the swash plate through a flat key, and the fixed end of the swash plate is fixedly connected to one side of the middle part of the main shaft through a swash plate locking nut. The disc spring sleeve, the disc spring, the thrust ball bearing, the plane bearing spacer ring, the end cover side spacer ring, the sealing ring, the combined sealing ring, the bearing side spacer ring and the cylindrical roller bearing assembly are symmetrically distributed on both sides of the main shaft, and the disc spring, the thrust ball bearing, the plane bearing spacer ring, the end cover side spacer ring, the combined sealing ring, the sealing ring, the bearing side spacer ring and the cylindrical roller bearing assembly are distributed in sequence from the end to the middle part of the main shaft; The sensor is connected to the fixed end of the rear cover via a sensor support. The sensor monitors the axial displacement of the main shaft in real time during the operation of the pump, thereby making a real-time evaluation of the performance of the pump.

2. The ultra-high pressure pump core with the function of monitoring axial displacement according to claim 1, characterized in that: The axes of the disc spring and the disc spring sleeve are on the same straight line.

3. The ultra-high pressure pump core with the function of monitoring axial displacement according to claim 1, characterized in that: The axes of the combined sealing ring and the end cover side spacer ring are on the same straight line.

4. The ultra-high pressure pump core with the function of monitoring axial displacement according to claim 1, characterized in that: The swash plate is a cylinder with variable thickness.

5. The ultra-high pressure pump core with the function of monitoring axial displacement according to claim 1, characterized in that: The axes of the main shaft, the front cover, the rear cover, the swash plate, the sensor support, the disc spring, the thrust ball bearing, the plane bearing spacer, the end cover side spacer, the sealing ring, the combined sealing ring, the bearing side spacer and the cylindrical roller bearing assembly are on the same straight line.

6. The ultra-high pressure pump core with the function of monitoring axial displacement according to claim 1, characterized in that: The number of the disc spring sleeve, the disc spring, the thrust ball bearing, the plane bearing spacer, the end cover side spacer, the sealing ring, the combined sealing ring, the bearing side spacer and the cylindrical roller bearing assembly is two.

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