Disc type multi-stage pressure scraper pump

Abstract

A pump cavity is formed in a pump body, a rotating disc shaft is arranged in the pump cavity, the input end of the rotating disc shaft is rotationally and hermetically connected with a rotating shaft hole formed in the bottom of the pump body and then extends out of the pump body, an end cover is hermetically fixed to the open end of the pump body, a plurality of cavities are formed between the end cover and the rotating disc shaft, and a scraper groove is formed in the inner surface of the end cover. The upper portion of the scraping plate is embedded into the scraping plate groove and fixed into the scraping plate groove through a spring, the rotating disc shaft rotates to drive the scraping plate to move, the free end of the scraping plate always abuts against the annular curved surface of the rotating disc shaft in a pressing mode, and a low-pressure fluid channel and a high-pressure fluid channel are formed in the end cover on the left side and the right side of the scraping plate groove respectively. The cavity between the end cover and the concave surface is divided into a low-pressure fluid cavity and a high-pressure fluid cavity, the cavity communicated with the low-pressure fluid channel is the low-pressure fluid cavity, the cavity communicated with the high-pressure fluid channel is the high-pressure fluid cavity, and the cavity between the end cover and the concave surface without the scraper at the upper part is the fluid trapping cavity. The output of multi-stage pressure energy is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of scraper pumps, and particularly relates to a disc type multi-stage pressure scraper pump. BACKGROUND

[0002] A hydraulic pump is a machine that converts mechanical energy input by a prime mover into hydraulic energy, and is divided into gear pumps, scraper pumps and plunger pumps. In theory, a hydraulic pump can also be converted into a hydraulic motor. At present, there are many studies on swash plate type hydraulic pumps or hydraulic motors and other power devices, but they generally have the following disadvantages: (1) the pressure output function is single, and generally only two pressure energy outputs can be achieved; (2) the space occupation area is large, and the space utilization rate is poor; (3) the structure components are difficult to manufacture, and the replaceability is poor; (4) for traditional multi-stage pressure output devices, the structure is relatively loose, there are more links for energy conversion and transmission, which leads to low efficiency, and there is a problem of unreasonable matching. In the transportation and engineering construction industries, with the continuous improvement of product requirements, the occasions requiring multi-stage pressure energy output continue to rise, and the demand for designing new multi-stage pressure power equipment becomes increasingly urgent, and the current such power equipment still lacks sufficient flexibility to meet this growing demand. Therefore, the application provides a disc type multi-stage pressure scraper pump, which has the advantages of the current scraper pump and can solve the problems of the existing power devices, such as loose structure, large volume, low energy conversion efficiency, and limited adaptability of not being able to achieve multi-stage pressure output, and aims to create a highly integrated power device that can achieve multi-stage pressure output. The device can design different cam curves of the rotating shaft according to different pressure grade outputs. SUMMARY

[0003] The application aims to overcome the shortcomings of the current common power device structure, such as loose structure, large volume, low energy conversion rate, poor adaptability, etc. By designing different cam curves of the rotating shaft, different flow outlets are designed according to the needs, and a power device with compact structure and multi-stage pressure output is formed.

[0004] In order to achieve the above purpose, the application adopts the following technical scheme:

[0005] The application discloses a disc type multi-stage pressure scraper pump, which comprises a rotating disc shaft, a pump body, an end cover, a scraper, a torsion spring, a low-pressure liquid passage and a high-pressure liquid passage; a pump cavity is arranged in the pump body, the rotating disc shaft is arranged in the pump cavity, a small gap is formed between the side surface of the rotating disc shaft and the inner wall of the pump cavity, the input end of the rotating disc shaft is connected with the rotating shaft hole arranged at the bottom of the pump body in a rotating sealing mode and extends out of the pump body, the side surface of the rotating disc shaft is a first type of spherical band surface, the upper surface of the rotating disc shaft comprises an annular surface formed by alternately arranging concave surfaces and convex surfaces, a central plane and a second type of spherical band surface arranged at the connection position of the annular surface and the central plane, the end cover is fixedly arranged at the opening end of the pump body, the central plane of the rotating disc shaft is abutted against the inner surface of the end cover, the top of the convex surface of the rotating disc shaft is also abutted against the inner surface of the end cover, a plurality of cavities are formed between the end cover and the concave surface of the annular surface, a plurality of scraper grooves are arranged on the inner surface of the end cover in an annular and symmetrical mode, the number of the scraper grooves is less than that of the cavities, the scraper is in one-to-one correspondence with the scraper grooves, the upper part of the scraper is embedded in the scraper groove and fixed in the scraper groove by the spring, the torsion spring applies elastic force to the scraper and the bottom of the scraper is pressed against the annular surface, the scraper can rotate around the scraper groove, the contact surfaces of the scraper, the pump cavity, the scraper groove and the rotating disc shaft are all in small gap connection, the rotating disc shaft drives the scraper to move, the free end of the scraper is always pressed against the annular surface of the rotating disc shaft, the low-pressure liquid passage and the high-pressure liquid passage are respectively arranged on the left and right side end covers of the scraper groove, when the scraper moves to a certain concave surface, the cavity between the end cover and the concave surface is divided into a low-pressure liquid cavity and a high-pressure liquid cavity, wherein, the cavity communicated with the low-pressure liquid passage is the low-pressure liquid cavity and the cavity communicated with the high-pressure liquid passage is the high-pressure liquid cavity, the cavity between the end cover and the concave surface without the scraper is a trapped liquid cavity.

[0006] The scraper is in linear contact with the annular surface, the profile of the annular surface is the envelope of the swinging scraper, and the annular surface is a sine profile or a combination of a plurality of profiles such as an ellipse, a semi-ellipse, a circle and a cycloid.

[0007] It is to be noted that the rotating disc shaft comprises a rotating disc body and a rotating disc input shaft, the sphere is cut by two parallel planes to form the rotating disc body, the outer side of the upper surface of the rotating disc body is provided with alternately arranged concave surfaces and convex surfaces, thereby forming the annular surface formed by alternately arranging the concave surfaces and the convex surfaces, the central plane and the second type of spherical band surface on the upper surface of the rotating disc shaft, the annular surface is arranged outside the central plane, the second type of spherical band surface is arranged at the connection position of the annular surface and the central plane, the side surface of the rotating disc shaft is the first type of spherical band surface, the rotating disc input shaft is fixed to the lower surface of the rotating disc body and coaxially arranged with the rotating disc body, and the lower surface of the rotating disc shaft is an annular plane.

[0008] It is to be noted that a cylindrical protrusion is arranged at the central position of the inner surface of the end cover, the scraper groove extends to the upper part of the cylindrical protrusion to form a scraper hole, a plurality of scraper grooves are annularly and equidistantly arranged on the outer side of the inner surface of the end cover, the peak of the convex surface in the annular surface of the rotating disc shaft is higher than the central plane, and the central plane of the rotating disc shaft is abutted against the cylindrical protrusion of the end cover.

[0009] It should be noted that the scraper includes a cylindrical fixing part and a scraper part. One side of the scraper part is fixed to the fixing part, and the fixing part is installed in the upper scraper groove. The fixing part and the scraper groove are fitted with a small clearance. An annular groove is opened on the outside of one end of the fixing part, and a torsion spring is sleeved in the annular groove. One end of the torsion spring is fixed to the fixing part, and the other end is fixed to the inner wall of the scraper hole. The inner side of the scraper part abuts against the second type of ball belt curved surface of the turntable shaft, and the outer side of the scraper part abuts against the inner wall of the pump cavity. The rotation of the turntable shaft drives the scraper to move, and the free end of the scraper part is always pressed against the annular curved surface of the turntable shaft.

[0010] It should be noted that the outer surface of the scraper part is an arc-shaped curved surface, which shares a spherical surface with the first type of ball belt curved surface, and the inner surface of the scraper part is an arc-shaped curved surface, which shares a spherical surface with the side surface of the second type of ball belt curved surface.

[0011] The bearing bush is placed inside the shaft hole with an interference fit. The bearing bush supports the output end of the turntable shaft. The turntable input shaft is installed inside the bearing bush with a clearance fit. The turntable input shaft rotates around the bearing bush. An FB-shaped sealing ring and a spring retaining ring are fixed in sequence inside the shaft hole at the front end of the bearing bush. The turntable input shaft passes through the bearing bush, the FB-shaped sealing ring, and the spring retaining ring in sequence.

[0012] The end cover is installed on the pump body opening end with bolts, and an O-ring is installed at the connection between the end cover and the pump body.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can be designed to realize the output of multi-stage pressure energy and the mutual conversion between mechanical energy and hydraulic energy according to its own needs. It has a compact structure, simple flow channel construction, high energy conversion rate, and broad application demand and industrialization prospects. Attached Figure Description

[0014] Figure 1 This is a front view of the disc-type multistage pressure scraper pump involved in this invention after being cut open.

[0015] Figure 2 This is a top view of the disc-type multistage pressure scraper pump involved in this invention.

[0016] Figure 3 This is a diagram showing the positional relationship between the turntable shaft, scraper, and end cap involved in the present invention.

[0017] Figure 4 This is a front view of the disc-type multistage pressure scraper pump involved in the present invention.

[0018] Figure 5 This is a perspective view of the turntable shaft involved in the present invention.

[0019] Figure 6 This is a perspective view of the end cap involved in the present invention.

[0020] Figure 7This is a perspective view of the scraper involved in the present invention.

[0021] Among them, 1 is the turntable shaft, 2 is the pump body, 3 is the end cover, 4 is the scraper, 5 is the torsion spring, 6 is the bolt, 7 is the O-ring, 8 is the bearing bush, 9 is the FB-shaped sealing ring, 10 is the spring retaining ring, 101 is the turntable body, 102 is the turntable input shaft, 103 is the annular curved surface, 104 is the center plane, 105 is the second type of ball belt curved surface, 106 is the annular plane, 107 is the first type of ball belt curved surface, 301 is the scraper groove, 302 is the cylindrical protrusion, 303 is the scraper hole, 401 is the fixing part, 402 is the scraper part, and 403 is the annular groove. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0023] It should be noted that in the following description, the terms "front," "rear," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. The terms "first," "second," etc., generally indicate the same type of component in different positions, with no structural differences between them.

[0024] Example 1

[0025] like Figures 1-4As shown, this embodiment relates to a disc-type multi-stage pressure scraper pump, including a rotary shaft 1, a pump body 2, an end cover 3, a scraper 4, a torsion spring 5, a low-pressure fluid channel 11, and a high-pressure fluid channel 12. A pump chamber is formed inside the pump body 2, and the rotary shaft 1 is placed within the pump chamber. The side of the rotary shaft 1 is fitted with a small clearance to the inner wall of the pump chamber to reduce internal leakage. The input end of the rotary shaft 1 extends out of the pump body 2 after being rotatably sealed to a shaft hole at the bottom of the pump body 2. The side of the rotary shaft 1 is a first-type spherical curved surface, and the upper surface of the rotary shaft 1 includes annular surfaces composed of alternating concave and convex surfaces. The curved surface 103, the central plane 104 at the center, and the second type of spherical curved surface 105 at the connection between the annular curved surface 103 and the central plane 104 are sealed and fixed to the opening end of the pump body 2. The central plane 104 of the turntable shaft 1 abuts against the inner surface of the end cover 3, and the top of the convex surface of the turntable shaft 1 also abuts against the inner surface of the end cover 3. Multiple chambers are formed between the end cover 3 and the concave surface of the annular curved surface. Multiple annularly symmetrical scraper grooves 301 are opened on the inner surface of the end cover 3. The number of scraper grooves 301 is less than the number of chambers (or concave surfaces). The scraper 4 and The scraper grooves 301 correspond one-to-one. The upper part of the scraper 4 is embedded in the scraper groove 301 and fixed in the scraper groove 301 by the spring 5. The torsion spring 5 applies a spring force to the scraper 4 pointing towards the annular curved surface 103, ensuring that the other side of the scraper part 402 is pressed against the annular curved surface 103. The scraper 4 can rotate around the scraper groove 301. The contact surfaces of the scraper 4 with the pump cavity, the scraper groove and the turntable shaft are all small clearance fits. The rotation of the turntable shaft 1 drives the scraper 4 to move. The free end of the scraper 4 is always pressed against the annular curved surface of the turntable shaft 1. The left and right end caps 3 of the scraper groove 301 are respectively opened Assume a low-pressure fluid channel 11 and a high-pressure fluid channel 12. When the scraper 4 moves to a certain concave surface, it divides the cavity between the end cap 3 and the concave surface (with the scraper on the upper part) into a low-pressure fluid cavity A and a high-pressure fluid cavity B. The cavity connected to the low-pressure fluid channel 11 is the low-pressure fluid cavity A, and the cavity connected to the high-pressure fluid channel 12 is the high-pressure fluid cavity B. The cavity between the end cap 3 and the concave surface without the scraper 4 on the upper part is a sealed cavity, namely the fluid-trapping cavity C. As the scraper 4 moves, the low-pressure fluid cavity A, the high-pressure fluid cavity B, and the fluid-trapping cavity C transform into each other.

[0026] It should be noted that in this embodiment, the scraper 4 and the annular curved surface 103 are in linear contact, and the profile (curved shape of the outer contour) of the annular curved surface 103 is the envelope of the oscillating scraper 4. The specific shape of the annular curved surface 103 can be designed according to its own pressure requirements. Different pressure requirements result in different surface shapes. Specifically, the annular curved surface 103 can be a sinusoidal profile, or a smooth ellipse, semi-ellipse, circle, cycloid, or other profiles or combinations thereof. Figure 5 The diagram shows a turntable shaft 1 structure, with its peak being an arc and its valleys being cycloids.

[0027] Specifically, this embodiment involves at least two scrapers 4. Driven by the turntable shaft 1, the scraper 4 moves to a concave surface of the annular curved surface 103, forming a low-pressure fluid chamber and a high-pressure fluid chamber, corresponding to the output of one pressure energy. When multiple scrapers 4 move to different concave surfaces, multiple pressure energies are generated; therefore, this invention is a multi-stage pressure scraper pump. It should be noted that the scraper 4, low-pressure fluid channel 11, and high-pressure fluid channel 12 involved in this embodiment correspond one-to-one. Furthermore, the low-pressure fluid channel 11 and the high-pressure fluid channel 12 are respectively connected to a low-pressure fluid pipe and a high-pressure fluid pipe.

[0028] It should be noted that, as Figure 5 As shown, the turntable shaft 1 includes a turntable body 101 and a turntable input shaft 102. The sphere is cut by two parallel planes to form the turntable body 101. The outer side of the upper surface of the turntable body 101 is provided with an alternating concave and convex structure, thereby forming an annular curved surface 103, a central plane 104, and a second type of spherical tape curved surface 105 on the upper surface of the turntable shaft. The annular curved surface 103 is located outside the central plane 104, and the second type of spherical tape curved surface 105 is located at the connection between the annular curved surface 103 and the central plane 104. The side of the turntable shaft is a first type of spherical tape curved surface 107. The turntable input shaft 102 is fixed to the lower surface of the turntable body 101 and the two are coaxially arranged. The lower surface of the turntable shaft is an annular plane 106. A sphere is cut by two parallel planes, and the part of the sphere between these two planes is called the spherical ribbon surface. That is, both the upper and lower ends of the spherical ribbon surface are circular. However, in this invention, the upper end of the side of the turntable shaft is not circular, but a wavy ring structure. Similarly, the lower end of the side where the ring surface 103 and the central plane 104 connect is a wavy ring structure. This structure is defined as a spherical ribbon surface.

[0029] It should be noted that, as Figure 6 As shown, in order to facilitate the upper part of the scraper 4 to be embedded in the scraper groove 301, a cylindrical protrusion 302 is provided at the center of the inner surface of the end cap 3 in this embodiment. The scraper groove 301 extends to the upper part of the cylindrical protrusion 302 to form a scraper hole 303. Multiple scraper grooves 301 are opened in a ring at equal intervals on the inner surface of the end cap 3 outside the cylindrical protrusion 302. The convex peak of the annular curved surface 103 of the turntable shaft 1 is higher than the central plane 104, thereby ensuring that the central plane 104 of the turntable shaft 1 abuts against the cylindrical protrusion 302 of the end cap 3.

[0030] It should be noted that, as Figure 7As shown, the scraper 4 includes a cylindrical fixing part 401 and a scraper part 402. One side of the scraper part 402 is fixed to the fixing part 401. The fixing part 401 is installed in the upper scraper groove 301. The fixing part 401 and the scraper groove 301 are fitted with a small clearance to ensure minimal internal leakage. An annular groove 403 is opened on the outside of one end of the fixing part 401. A torsion spring 5 is sleeved in the annular groove 403. One end of the torsion spring 5 is fixed to the fixing part 401, and the other end is fixed to the inner wall of the scraper hole 303. The inner side of the scraper part 402 abuts against the second type of ball belt curved surface 105 of the turntable shaft 1, and the outer side of the scraper part 402 abuts against the inner wall of the pump cavity. The rotation of the turntable shaft 1 drives the scraper 4 to move. The free end of the scraper part 402 is always pressed against the annular curved surface of the turntable shaft 1. The torsion spring 5 applies a spring force to the scraper 4 pointing towards the annular curved surface 103, ensuring that the other side of the scraper part 402 is pressed against the annular curved surface 103, improving the sealing performance. Simultaneously, when the turntable shaft 1 rotates, the turntable shaft 1 and the scraper 4 can always slide relative to each other, preventing self-locking. Under the combined action of the thrust of the turntable shaft 1 and the spring force of the torsion spring 5, the scraper 4 swings, and its free end always presses against the annular curved surface 103 of the turntable shaft 1, achieving a seal while isolating the left and right cavities, and simultaneously scraping the fluid on the annular curved surface 103. Specifically, the scraper 4 and the scraper hole 303 have a small clearance fit to ensure minimal internal leakage. The outer shape of the scraper part 402 near the turntable shaft 1 is curved, fitting with the annular curved surface 103 of the turntable shaft 1 to facilitate smooth rotation.

[0031] It should be noted that the inner side of the scraper portion 402 abuts against the second type of ball belt curved surface 105 of the turntable shaft 1, and the outer side of the scraper portion 402 abuts against the inner wall of the pump cavity. It can be understood that the outer side of the scraper portion 402 is an arc-shaped curved surface, which shares a spherical surface with the first type of ball belt curved surface, and the inner side of the scraper portion 402 is an arc-shaped curved surface, which shares a spherical surface with the side of the second type of ball belt curved surface 105.

[0032] like Figure 1 As shown, this embodiment relates to a disc-type multistage pressure scraper pump, including a bearing 8, an FB-shaped sealing ring 9, and a spring retaining ring 10. The bearing 8 is placed inside the shaft hole with an interference fit, and the bearing 8 supports the output end of the disc shaft 1. The disc input shaft 102 is installed inside the bearing 8 with a clearance fit. The disc input shaft 102 rotates around the bearing 8. The FB-shaped sealing ring 9 and the spring retaining ring 10 are sequentially fixed inside the shaft hole at the front end of the bearing 8. The disc input shaft 102 passes through the bearing 8, the FB-shaped sealing ring, and the spring retaining ring in sequence. The FB-shaped sealing ring and the spring retaining ring achieve a seal between the disc input shaft 102 and the shaft hole.

[0033] like Figure 1As shown, in this embodiment, the end cap 3 is sealed and fixed at the opening end of the pump body 2. Specifically, the end cap 3 is installed at the opening end of the pump body 2 by bolts 6, and an O-ring 7 is provided at the connection between the end cap 3 and the pump body 2 to prevent leakage of fluid and ensure the sealing performance of the pump body 2.

[0034] This embodiment relates to a disc-type multi-stage pressure scraper pump that can convert mechanical energy into hydraulic energy during operation. It not only has a compact structure and fewer parts, but also achieves multi-stage pressure energy output and can be designed according to specific requirements. Furthermore, the internal flow channels of this invention are simple and easy to cast, unlike current pressure equipment which has extremely complex flow channel variations, giving it advantages not found in current pressure equipment. This invention uses four sets of pressure delivery ports as an example for functional explanation. Specifically, scraper 4 includes scraper 4A, scraper 4B, scraper 4C, and scraper 4D. Correspondingly, low-pressure fluid channel 11 includes low-pressure fluid channel 11A, low-pressure fluid channel 11B, low-pressure fluid channel 11C, and low-pressure fluid channel 11D, and high-pressure fluid channel 12 includes high-pressure fluid channel 12A, high-pressure fluid channel 12B, high-pressure fluid channel 12C, and high-pressure fluid channel 12D. Each scraper has a low-pressure fluid channel connected to a low-pressure fluid chamber and a high-pressure fluid channel connected to a high-pressure fluid chamber. The high-pressure fluid chamber is tilted in the opposite direction to the rotation of the turntable shaft 1, while the low-pressure fluid chamber is tilted in the same direction as the rotation of the turntable shaft 1.

[0035] When converting mechanical energy into hydraulic energy, this invention functions as a hydraulic pump. At this time, an external power source drives the turntable shaft 1 to rotate via a key connection, simultaneously causing the scraper 4 to move synchronously. Under the action of the torsion spring 5, the scraper 4 always presses against the annular curved surface 103 of the turntable shaft 1, and the two are in linear contact. The higher the fluid pressure, the greater the pressure between the scraper 4 and the annular curved surface 103 of the turntable shaft 1, resulting in better sealing performance.

[0036] Taking the low-pressure fluid channel 11A and high-pressure fluid channel 12A of this invention as examples, when the turntable shaft 1 rotates, the scraper 4A scrapes the fluid, causing the volume of the low-pressure fluid cavity A connected to the low-pressure fluid channel 11A to increase. At the same time, the low-pressure fluid enters the low-pressure fluid channel 11A, while the volume of the high-pressure fluid cavity B connected to the high-pressure fluid channel 12A decreases, expelling the high-pressure liquid and generating pressure energy. At the same time, the scrapers 4A, 4B, 4C and 4D move to different concave surfaces, which will generate multiple pressure energies. The turntable shaft 1 continues to rotate, and the scraper 4 moves to the confined fluid cavity C next to the high-pressure fluid cavity B. The confined fluid cavity C is transformed into a low-pressure fluid cavity and a high-pressure fluid cavity. The low-pressure fluid is continuously drawn into the low-pressure fluid cavity, and the high-pressure fluid is continuously squeezed out from the high-pressure fluid cavity, which can realize the conversion of mechanical energy into hydraulic energy and output different hydraulic energies.

[0037] When converting hydraulic energy into mechanical energy, this invention functions as a hydraulic motor. High-pressure fluid is continuously input through any port of the high-pressure fluid channel 12, while low-pressure fluid is continuously output from the corresponding low-pressure fluid channel 11, creating a continuous pressure difference. This pressure difference drives the continuous rotation of the turntable shaft 1. The conversion of hydraulic energy into mechanical energy is achieved through a key connection in the lower half of the turntable shaft 1.

Claims

1. A disc-type multistage pressure scraper pump, characterized in that, The pump body includes a rotary shaft, pump body, end cover, scraper, torsion spring, low-pressure fluid channel, and high-pressure fluid channel. A pump chamber is formed within the pump body, and the rotary shaft is placed within the pump chamber. The side of the rotary shaft is fitted with the inner wall of the pump chamber with a small clearance. The input end of the rotary shaft extends out of the pump body after being rotatably sealed to a shaft hole at the bottom of the pump body. The side of the rotary shaft is a first-type spherical surface. The upper surface of the rotary shaft includes an annular surface composed of alternating concave and convex surfaces, a central plane at the center, and a second-type spherical surface at the junction of the annular surface and the central plane. The end cover is sealed and fixed to the open end of the pump body. The central plane of the rotary shaft abuts against the inner surface of the end cover, and the top of the convex surface of the rotary shaft also abuts against the inner surface of the end cover. Multiple chambers are formed between the end cover and the concave surface of the annular surface. Multiple annularly symmetrical scraper grooves are formed on the inner surface of the end cover, with the number of scraper grooves being less than the number of... The number of chambers corresponds one-to-one with the scraper and the scraper groove. The upper part of the scraper is embedded in the scraper groove and fixed in the scraper groove by a spring. The torsion spring applies a spring force to the scraper pointing towards the annular curved surface. The other side of the scraper is pressed against the annular curved surface. The scraper can rotate around the scraper groove. The contact surfaces of the scraper with the pump chamber, the scraper groove and the turntable shaft are all small clearance fits. The rotation of the turntable shaft drives the scraper to move. The free end of the scraper is always pressed against the annular curved surface of the turntable shaft. Low-pressure fluid channels and high-pressure fluid channels are opened on the left and right end caps of the scraper groove, respectively. When the scraper moves to a certain concave surface, it divides the chamber between the end cap and the concave surface into a low-pressure fluid chamber and a high-pressure fluid chamber. The chamber connected to the low-pressure fluid channel is the low-pressure fluid chamber, and the chamber connected to the high-pressure fluid channel is the high-pressure fluid chamber. The chamber between the end cap and the upper concave surface without the scraper is the confined fluid chamber.

2. The disc-type multi-stage pressure scraper pump according to claim 1, characterized in that, The scraper and the annular surface are in linear contact. The profile of the annular surface is the envelope of the oscillating scraper. The annular surface is a sinusoidal profile, or a combination of various profiles such as a smooth ellipse, semi-ellipse, circle, or cycloid.

3. The disc-type multi-stage pressure scraper pump according to claim 1, characterized in that, The turntable shaft includes a turntable body and a turntable input shaft. The sphere is cut by two parallel planes to form the turntable body. The outer side of the upper surface of the turntable body is provided with an alternating concave and convex structure, which in turn forms an annular curved surface, a central plane, and a second type of spherical ribbon curved surface on the upper surface of the turntable shaft. The annular curved surface is located outside the central plane, and the second type of spherical ribbon curved surface is located at the connection between the annular curved surface and the central plane. The side of the turntable shaft is a first type of spherical ribbon curved surface. The turntable input shaft is fixed to the lower surface of the turntable body and the two are coaxially arranged. The lower surface of the turntable shaft is an annular plane.

4. The disc-type multi-stage pressure scraper pump according to claim 3, characterized in that, A cylindrical protrusion is provided at the center of the inner surface of the end cap. The scraper groove extends to the upper part of the cylindrical protrusion to form a scraper hole. Multiple scraper grooves are opened in a ring at equal intervals on the inner surface of the end cap outside the cylindrical protrusion. The convex peak of the annular curved surface of the turntable shaft is higher than the central plane. The central plane of the turntable shaft abuts against the cylindrical protrusion of the end cap.

5. The disc-type multi-stage pressure scraper pump according to claim 4, characterized in that, The scraper includes a cylindrical fixing part and a scraper part. One side of the scraper part is fixed to the fixing part, and the fixing part is installed in the upper scraper groove. The fixing part and the scraper groove are fitted with a small clearance. An annular groove is opened on the outside of one end of the fixing part, and a torsion spring is sleeved in the annular groove. One end of the torsion spring is fixed to the fixing part, and the other end is fixed to the inner wall of the scraper hole. The inner side of the scraper part abuts against the second type of ball belt curved surface of the turntable shaft, and the outer side of the scraper part abuts against the inner wall of the pump cavity. The rotation of the turntable shaft drives the scraper to move, and the free end of the scraper part is always pressed against the annular curved surface of the turntable shaft.

6. The disc-type multi-stage pressure scraper pump according to claim 5, characterized in that, The outer side of the scraper section is an arc-shaped curved surface, which shares a spherical surface with the first type of ball belt curved surface. The inner side of the scraper section is an arc-shaped curved surface, which shares a spherical surface with the side of the second type of ball belt curved surface.

7. The disc-type multi-stage pressure scraper pump according to claim 1, characterized in that, The bearing bush is placed inside the shaft hole with an interference fit. The bearing bush supports the output end of the turntable shaft. The turntable input shaft is installed inside the bearing bush with a clearance fit. The turntable input shaft rotates around the bearing bush. An FB-shaped sealing ring and a spring retaining ring are fixed in sequence inside the shaft hole at the front end of the bearing bush. The turntable input shaft passes through the bearing bush, the FB-shaped sealing ring, and the spring retaining ring in sequence.

8. The disc-type multi-stage pressure scraper pump according to claim 1, characterized in that, The end cover is installed on the pump body opening end with bolts, and an O-ring is installed at the connection between the end cover and the pump body.

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