Novel petroleum relay pump

Abstract

The invention relates to the technical field of relay pumps, and discloses a novel petroleum relay pump which comprises a winding type soft starting structure, a pneumatic type telescopic structure and a contact type linkage structure. According to the novel petroleum relay pump, the torque load of the driving motor is effectively controlled through the high-pressure acting force formed by gas, and once the torque resistance caused by blockage or other phenomena is larger than the compressive strength of the high-pressure gas in the oil feeding process, the driving motor can normally rotate at the rated power; according to the overload protection device for the driving motor, the gas pressure is controllable, so that the discharge water pressure cannot be continuously increased, the driving motor is effectively prevented from being damaged due to overload, and in addition, the gas pressure is controllable, so that the overload protection range of the driving motor is widened.

Description

Technical Field

[0001] This invention relates to the field of relay pump technology, specifically a novel petroleum relay pump. Background Technology

[0002] Central processing stations are usually built in relatively convenient locations. In order to transport the mixture of oil, gas, mud, sand, water and other media lifted from the wellhead to the central processing station, in addition to the transport pipelines, relay pumps are also needed as the power source for transporting the oil and gas mixture in the pipelines.

[0003] For example, Chinese patent publication number "CN113279733B" discloses "A Novel Oil Relay Pump," whose main structure includes a pump body, an oil inlet, and an oil outlet. A feed valve is installed at the oil inlet, and a discharge valve is installed at the oil outlet. At least one set of integrated piston chambers are symmetrically arranged within the pump body. Each integrated piston chamber has two delivery pistons mounted opposite each other. The feed valve at the oil inlet and the discharge valve at the oil outlet, together with the cavity formed by the maximum stroke of the two delivery pistons moving in opposite directions within the piston chamber, constitute the delivery chamber. A synchronous transmission mechanism is connected to the pump body, including a transmission chamber and a drive chamber. A synchronization component is installed in the transmission chamber, and a drive component is installed in the drive chamber. The synchronization component is connected to the drive component. The use of two opposing delivery pistons reduces mechanical vibration during operation and ensures smooth operation.

[0004] A careful examination of the aforementioned new type of oil relay pump reveals that during operation, if the pump body experiences overload due to blockage or transport resistance, the drive motor will also be overloaded by this resistance. This overload can result in minor damage to the drive motor or, in severe cases, burn out the drive motor. Therefore, the aforementioned new type of oil relay pump has poor protection capabilities for the drive motor. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a novel oil relay pump that utilizes the high-pressure force generated by gas to effectively control the torque load of the drive motor. During oil supply, if the torque resistance caused by blockage or other phenomena exceeds the pressure resistance of the high-pressure gas, the drive motor can still rotate normally at its rated power without causing the discharge water pressure to continue to increase. This effectively prevents damage to the drive motor due to overload. Furthermore, the controllability of the gas pressure enhances its overload protection range for the drive motor, thus solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a novel oil relay pump, comprising a bottom support base plate and a drive motor and a multi-stage pump body mounted on the bottom support base plate via a fixed base, further comprising a winding soft-start structure, wherein the internal components include a first rotating plate that rotates with the rotor of the drive motor, a second rotating plate that rotates with the first rotating plate, and three winding cables embedded in the opposing end faces of the first and second rotating plates and generating a linkage effect after winding; a pneumatic telescopic structure, wherein the internal components include a transverse hollow rod that rotates with the second rotating plate, a main piston body placed inside the transverse hollow rod and capable of moving away from the second rotating plate after gas injection, and a polygonal telescopic rod that moves laterally with the main piston body; and a contact linkage structure, wherein the internal components include a third rotating plate that rotates with the polygonal telescopic rod, a fourth rotating plate that drives the rotor of the multi-stage pump body to rotate, multiple semi-cylindrical protrusions arranged in a ring array on the end face of the third rotating plate, and multiple semi-cylindrical grooves arranged in a ring array on the end face of the fourth rotating plate, allowing the semi-cylindrical protrusions to be inserted into the grooves.

[0007] Preferably, the winding soft-start structure includes a first rotating plate and a second rotating plate. One end face of the first rotating plate is provided with a rotor fixing groove for fixing and installing the rotor of the drive motor. A first rotating shaft is fixedly installed at the center of one end face of the second rotating plate. The first rotating shaft is mounted on the upper surface of the bottom support base through a bearing and a fixing base. Three winding cables arranged in a ring array and generating a linkage effect after winding are connected between the opposite end faces of the first rotating plate and the second rotating plate.

[0008] Preferably, in the initial state, the length of the winding cable is greater than the lateral distance between the first rotating plate and the second rotating plate.

[0009] Preferably, the pneumatic telescopic structure includes a transverse hollow rod. One end of the transverse hollow rod is provided with a shaft fixing groove for fixing a first rotating shaft. The interior of the transverse hollow rod is provided with a main transverse hollow movable cavity. A gas limiting flow cavity is provided on the end face of the transverse hollow movable cavity near the shaft fixing groove. A gas flow channel, integral with the transverse hollow rod and connected to the gas limiting flow cavity, is provided on the circumferential side of the transverse hollow rod. The other end of the transverse hollow rod is provided with a polygonal rod hole connected to the transverse hollow movable cavity. A main piston body, which can move laterally along the transverse hollow movable cavity, is placed inside the transverse hollow rod in the transverse hollow movable cavity. A polygonal telescopic rod, penetrating the polygonal rod hole, is fixedly installed on one end face of the main piston body. A main helical spring in a compressed state is sleeved around the rod body inside the transverse hollow movable cavity. The main helical spring generates elastic pressure on the main piston body in the direction of the gas limiting flow cavity.

[0010] Preferably, the structural shape of the polygonal rod hole cross-section is consistent with the structural shape of the polygonal telescopic rod cross-section, both being polygonal structures, and the structural dimensions of the polygonal rod hole cross-section match the structural dimensions of the polygonal telescopic rod cross-section.

[0011] Preferably, the contact linkage structure includes a third rotating plate and a fourth rotating plate. One end face of the third rotating plate is provided with a polygonal fixing groove for fixing and installing a polygonal telescopic rod. One end face of the fourth rotating plate is fixedly installed with a second rotating shaft that is connected to the rotor of the multi-stage pump body through a coupling. The other end of the third rotating plate is provided with a plurality of annular array semi-cylindrical protrusions that are integral with the third rotating plate. The other end of the fourth rotating plate is provided with a plurality of annular array semi-cylindrical grooves for holding the semi-cylindrical protrusions.

[0012] Preferably, the structural shape of the semi-cylindrical protrusion structure and the structural shape of the semi-cylindrical groove structure are the same, both being semi-cylindrical structures.

[0013] Preferably, it also includes a water hammer effect mitigation structure, which internally includes a liquid discharge hole for discharging oil from the discharge port of the multi-stage pump body, a cylindrical elastic gas film disposed on the circumferential side of the liquid discharge hole and expanding outward after the pressure of the flowing liquid increases, a buffer solution filling the closed area outside the cylindrical elastic gas film, a secondary piston body that undergoes lateral displacement with the pressure of the buffer solution, and a secondary helical spring that provides a buffer damping effect on the secondary piston body.

[0014] Preferably, the water hammer effect mitigation structure includes a longitudinal hollow column. The bottom center of the longitudinal hollow column has an inlet channel integral with the column and connected to the drain port of the multi-stage pump body. The top center of the longitudinal hollow column has a drain channel integral with the column. A liquid discharge hole for oil flow is located at the center of the longitudinal hollow column, the inlet channel, and the drain channel. An annular liquid pre-reserved cavity is located in the middle region of the longitudinal hollow column around the liquid discharge hole. A cylindrical elastic gas film is embedded at the intersection of the liquid discharge hole and the annular liquid pre-reserved cavity. The circumferential side of the longitudinal hollow column is provided with… A transverse hollow column, integrally formed with the longitudinal hollow column, is provided. A secondary transverse hollow flow cavity is located inside the transverse hollow column. A liquid compensation hole, connecting the annular liquid pre-reserved cavity and the secondary transverse hollow flow cavity, is located inside the longitudinal hollow column. A secondary piston body, capable of axial movement along the secondary transverse hollow flow cavity, is placed inside the transverse hollow column within the secondary transverse hollow flow cavity. Buffer solution is filled in the enclosed area between the secondary piston body and the cylindrical elastic gas film inside both the longitudinal and transverse hollow columns. A secondary helical spring, generating elastic pressure towards the liquid compensation hole, is placed inside the transverse hollow column within the secondary transverse hollow flow cavity.

[0015] Preferably, the cylindrical elastic air film is a cylindrical structure made of elastic rubber.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By utilizing the high pressure force generated by the gas, the torque load of the drive motor is effectively controlled. Once the torque resistance caused by blockage or other phenomena during the oil supply process exceeds the pressure resistance of the high-pressure gas, the drive motor can still rotate normally at the rated power without causing the discharge water pressure to continue to increase. This effectively prevents the drive motor from being damaged due to overload. In addition, the gas pressure is controllable, thereby improving its overload protection range for the drive motor. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the wound soft-start structure in this invention; Figure 3 This is a perspective view of the pneumatic telescopic structure in this invention; Figure 4 This is a three-dimensional cross-sectional view of the pneumatic telescopic structure in this invention; Figure 5 This is a perspective view of the contact-type linkage structure in this invention; Figure 6This is a three-dimensional cross-sectional view of the contact linkage structure in this invention; Figure 7 This is a perspective view of the water hammer effect mitigation structure in this invention; Figure 8 This is a three-dimensional cross-sectional view of the water hammer effect weakening structure in this invention.

[0018] The components include: 1. Bottom support base; 2. Fixed base; 3. Drive motor; 4. Multistage pump body; 5. Liquid inlet port; 6. Liquid outlet port; 7. Winding soft-start structure; 71. First rotating plate; 72. Second rotating plate; 73. Rotor fixing groove; 74. First rotating shaft; 75. Winding cable; 8. Pneumatic telescopic structure; 81. Transverse hollow rod; 82. Shaft fixing groove; 83. Gas limiting flow cavity; 84. Gas flow channel; 85. Transverse hollow movable cavity; 86. Main piston body; 87. Polygonal rod hole; 88. Main helical spring; 89. Polygonal telescopic rod. 9. Contact-type linkage structure; 91. Third rotating plate; 92. Fourth rotating plate; 93. Polygonal fixing groove; 94. Second rotating shaft; 95. Semi-cylindrical protrusion structure; 96. Semi-cylindrical groove structure; 10. Water hammer effect weakening structure; 101. Longitudinal hollow column; 102. Liquid inlet channel; 103. Liquid outlet channel; 104. Annular liquid reserved cavity; 105. Transverse hollow column; 106. Cylindrical elastic gas film; 107. Secondary transverse hollow flow cavity; 108. Liquid compensation hole; 109. Secondary piston body; 1010. Secondary helical spring; 1011. Liquid discharge hole. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 A novel petroleum relay pump includes a bottom support base plate 1, a drive motor 3 mounted on the bottom support base plate 1 via a fixed base 2, and a multi-stage pump body 4. The inlet port 5 of the multi-stage pump body 4 needs to be connected to a pipeline for transporting petroleum, and the discharge channel 103 is connected to the subsequent petroleum input pipeline. The drive motor 3 is started, and the rotor of the drive motor 3 drives the rotor of the multi-stage pump body 4 to rotate, which in turn drives the impeller inside the multi-stage pump body 4 to rotate rapidly. This allows high-temperature liquid to enter through the inlet port 5 and be discharged into the inlet channel 102 through the discharge port 6, thereby achieving the driving effect of the liquid.

[0021] To achieve a soft-start effect for the drive motor 3 on the multi-stage pump body 4, thereby reducing the negative impact of vibration or rotational eccentricity on the drive motor 3, please refer to [link to relevant documentation]. Figure 1 and Figure 2 A winding soft-start structure 7 is required, which contains a first rotating plate 71 that rotates with the rotor of the drive motor 3, a second rotating plate 72 that rotates with the first rotating plate 71, and three winding cables 75 embedded in the opposite end faces of the first rotating plate 71 and the second rotating plate 72, which create a linkage effect after winding. When the drive motor 3 starts, the torque resistance generated by the multi-stage pump body 4 during operation will cause the multiple winding cables 75 to wind together. This winding phenomenon will reduce the overall lateral length of the winding cables 75. After the winding process continues for a period of time, the first rotating plate 71 can drive the second rotating plate 72 to rotate. Since the winding cables 75 have a bendable effect in the longitudinal direction, the deviation of the multi-stage pump body 4 due to vibration or rotational eccentricity during operation will not damage the drive motor 3, thereby achieving a soft-start effect of the drive motor 3 on the multi-stage pump body 4, thus reducing the negative impact of vibration or rotational eccentricity on the drive motor 3.

[0022] For details regarding the specific structure of the described winding soft-start structure 7, please refer to [link / reference]. Figure 2 The system includes a first rotating plate 71 and a second rotating plate 72. One end face of the first rotating plate 71 is provided with a rotor fixing groove 73 for fixing and installing the rotor of the drive motor 3. A first rotating shaft 74 is fixedly installed at the center of one end face of the second rotating plate 72. The first rotating shaft 74 is installed on the upper surface of the bottom support base plate 1 through a bearing and a fixing base 2. Three winding cables 75 arranged in a ring array and generating a linkage effect after winding are connected between the opposite end faces of the first rotating plate 71 and the second rotating plate 72. In order to have sufficient winding degree, the length of the winding cable 75 needs to be greater than the lateral spacing between the first rotating plate 71 and the second rotating plate 72 in the initial state.

[0023] To utilize gas pressure to provide sufficient resistance strength, thereby regulating and controlling the torque load, please refer to [link to relevant documentation]. Figure 1 , Figure 3 and Figure 4A pneumatic telescopic structure 8 is required, which contains a transverse hollow rod 81 that rotates with the second rotating plate 72, a main piston 86 placed inside the transverse hollow rod 81 that moves away from the second rotating plate 72 after gas is injected, and a polygonal telescopic rod 89 that moves laterally with the main piston 86. It needs to be used in conjunction with a pneumatic system. During operation, a valve core needs to be installed inside the gas flow channel 84. Then, the pneumatic system is activated, and gas will continuously enter the main transverse hollow active cavity 85, causing the main piston 86 to move away from the second rotating plate 72. This allows the semi-cylindrical protrusion 95 to be inserted into the semi-cylindrical groove 96. As the gas pressure increases, the pressure of the semi-cylindrical protrusion 95 on the semi-cylindrical groove 96 also increases. This pressure is named F1. Therefore, the magnitude of F1 changes with the gas pressure, thereby using the gas pressure to provide sufficient clamping force to achieve the function of adjusting and controlling torque load.

[0024] For details regarding the pneumatic telescopic structure 8, please refer to [link / reference]. Figure 3 and Figure 4 The system includes a transverse hollow rod 81. One end of the transverse hollow rod 81 has a shaft fixing groove 82 for fixing a first rotating shaft 74. The interior of the transverse hollow rod 81 has a main transverse hollow movable cavity 85. A gas limiting flow cavity 83 is provided on the end face of the transverse hollow movable cavity 85 near the shaft fixing groove 82. A gas flow channel 84, integral with the transverse hollow rod 81 and communicating with the gas limiting flow cavity 83, is provided on the circumferential side of the transverse hollow rod 81. The other end of the transverse hollow rod 81 has a polygonal rod hole 87 communicating with the transverse hollow movable cavity 85. A main piston body 86, which can move laterally along the transverse hollow movable cavity 85, is placed inside the transverse hollow movable cavity 85. A polygonal telescopic rod 89, which passes through a polygonal rod hole 87, is fixedly installed on one end face of the body 86. In order for this structure to have the function of transmitting rotation, the structural shape of the cross-section of the polygonal rod hole 87 and the structural shape of the cross-section of the polygonal telescopic rod 89 must be consistent, both being polygonal structures, and the structural dimensions of the cross-section of the polygonal rod hole 87 must match the structural dimensions of the cross-section of the polygonal telescopic rod 89. A main helical spring 88 in a compressed state is placed around the rod body located inside the transverse hollow movable cavity 85. The main helical spring 88 generates elastic pressure on the main piston body 86 in the direction of the gas limiting flow cavity 83. One end of the main helical spring 88 abuts against one end face of the transverse hollow movable cavity 85, and the other end abuts against the end face of the main piston body 86.

[0025] To achieve a counter-interlocking effect and thus prevent overloading, please refer to [link / reference needed]. Figure 1 , Figure 5 and Figure 6 A contact-type linkage structure 9 needs to be set up, which internally includes a third rotating plate 91 that rotates with the polygonal telescopic rod 89, a fourth rotating plate 92 that drives the rotor of the multi-stage pump body 4 to rotate, multiple semi-cylindrical protrusions 95 arranged in a ring array on the end face of the third rotating plate 91, and multiple semi-cylindrical grooves 96 arranged in a ring array on the end face of the fourth rotating plate 92, allowing the semi-cylindrical protrusions 95 to be inserted into them. Due to the gas pressure, the semi-cylindrical protrusions 95 are inserted into the corresponding semi-cylindrical grooves 96. When the third rotating plate 91 rotates with the polygonal telescopic rod 89, it enables the fourth rotating plate 92 to drive the rotor of the multi-stage pump body 4 to rotate. Once the torque load of the multi-stage pump body 4 during rotation exceeds the strength of F1 mentioned above, the semi-cylindrical protrusion structure 95 will disengage from the control of the semi-cylindrical groove structure 96. Therefore, the third rotating plate 91 will not continue to drive the fourth rotating plate 92 to rotate, and the liquid strength in the multi-stage pump body 4 will not continue to increase. The third rotating plate 91 can continue to rotate with the drive motor 3, thereby effectively preventing the drive motor 3 from being damaged due to overload.

[0026] For details regarding the specific structure of the aforementioned abutment linkage structure 9, please refer to [link / reference]. Figure 5 and Figure 6 The system includes a third rotating plate 91 and a fourth rotating plate 92. One end face of the third rotating plate 91 is provided with a polygonal fixing groove 93 for fixing and installing a polygonal telescopic rod 89. One end face of the fourth rotating plate 92 is fixedly installed with a second rotating shaft 94 that is connected to the rotor of the multi-stage pump body 4 through a coupling. The other end of the third rotating plate 91 is provided with a plurality of annular array semi-cylindrical protrusion structures 95 that are integral with the third rotating plate 91. The other end of the fourth rotating plate 92 is provided with a plurality of annular array semi-cylindrical groove structures 96 for holding the semi-cylindrical protrusion structures 95. In order to achieve both linkage and disengagement effects, the structural shapes of the semi-cylindrical protrusion structures 95 and the semi-cylindrical groove structures 96 must be consistent and both be semi-cylindrical structures.

[0027] To reduce the water hammer effect caused by the sudden closure of the oil passage in subsequent injection equipment, please refer to [link / reference]. Figure 1 , Figure 7 and Figure 8A water hammer effect mitigation structure 10 needs to be set up. The structure includes a liquid discharge hole 1011 for discharging oil from the discharge port of the multi-stage pump body 4, a cylindrical elastic gas film 106 located on the circumferential side of the liquid discharge hole 1011 and expanding outward after the pressure of the flowing liquid increases, a buffer solution filling the closed area around the cylindrical elastic gas film 106, a secondary piston body 109 that moves laterally with the pressure of the buffer solution, and a secondary helical spring 1010 that provides a buffer damping effect on the secondary piston body 109. When the oil channel of the subsequent injected equipment is suddenly closed, the liquid pressure in the cylindrical elastic gas film 106 will suddenly increase, forming a water hammer effect. The sudden increase in liquid pressure will cause the cylindrical elastic gas film 106 to expand outward, thereby causing the surrounding buffer solution to exert a force on the secondary piston body 109, causing the secondary piston body 109 to move in a specific direction. This allows the flowing liquid to have a certain buffering and pressure reduction function to reduce the water hammer effect caused by the sudden closure of the oil channel of the subsequent injected equipment.

[0028] For details regarding the specific structure of the water hammer effect mitigation structure 10, please refer to [link / reference needed]. Figure 7 and Figure 8The system includes a longitudinal hollow column 101. At the center of the bottom end of the longitudinal hollow column 101 is an inlet channel 102, integrally formed with the column and connected to the drain port 6 of the multi-stage pump body 4. At the center of the top end of the longitudinal hollow column 101 is a drain channel 103, integrally formed with the column. At the center of the longitudinal hollow column 101, the inlet channel 102, and the drain channel 103 is a liquid discharge hole 1011 for oil flow. In the middle region of the longitudinal hollow column 101, an annular liquid pre-reserved cavity 104 is provided around the liquid discharge hole 1011. A cylindrical elastic gas membrane 106 is embedded at the intersection of the liquid discharge hole 1011 and the annular liquid pre-reserved cavity 104. To achieve expansion and increase the internal space, the cylindrical elastic gas membrane 106 needs to be made of elastic rubber. The structure includes a transverse hollow column 105 integrally formed with the longitudinal hollow column 101 on its circumferential side. A secondary transverse hollow flow cavity 107 is provided inside the transverse hollow column 105. A liquid compensation hole 108 connecting the annular liquid pre-reserved cavity 104 and the secondary transverse hollow flow cavity 107 is provided inside the transverse hollow column 105. A secondary piston body 109, movable axially along the secondary transverse hollow flow cavity 107, is placed inside the secondary transverse hollow flow cavity 107 in the transverse hollow column 105. A buffer solution is filled in the closed area between the secondary piston body 109 and the cylindrical elastic gas film 106 inside the longitudinal hollow column 101 and the transverse hollow column 105. A secondary helical spring 1010, generating elastic pressure towards the liquid compensation hole 108 on the secondary piston body 109, is placed inside the secondary transverse hollow flow cavity 107 in the transverse hollow column 105.

[0029] The auxiliary piston body 109 has a piston-like structure and is placed inside the auxiliary transverse hollow flow cavity 107. It can move axially inside the auxiliary transverse hollow flow cavity 107. The auxiliary helical spring 1010 has a helical shape and is installed at one end of the auxiliary piston body 109. It produces an elastic damping effect on the auxiliary piston body 109.

[0030] The working principle of this invention is as follows: the liquid inlet port 5 of the multi-stage pump body 4 needs to be connected to the pipeline used to transport oil, and then the liquid discharge channel 103 is connected to the subsequent oil input pipeline. At the same time, a valve core needs to be installed inside the gas flow channel 84. When the pneumatic system is activated, gas will continuously enter the main transverse hollow active cavity 85, causing the main piston body 86 to move away from the second rotating plate 72, so that the semi-cylindrical protrusion structure 95 is inserted into the semi-cylindrical groove structure 96, forming a counterforce F1. When the drive motor 3 is started, the torque resistance generated by the multi-stage pump body 4 during operation will cause multiple winding cables 75 to become entangled. This entanglement will reduce the overall lateral length of the winding cables 75. After the entanglement process continues for a period of time, the first rotating plate 71 can drive the second rotating plate 72 to rotate. Due to the force F1, the semi-cylindrical protrusion 95 is inserted into the semi-cylindrical groove 96. Therefore, when the third rotating plate 91 rotates with the polygonal telescopic rod 89, the fourth rotating plate 92 can drive the rotor of the multi-stage pump body 4 to rotate. Once the torque load of the multi-stage pump body 4 during rotation exceeds the strength of F1, the cylindrical protrusion 95 will disengage from the control of the semi-cylindrical groove 96. Therefore, the third rotating plate 91 will not continue to drive the fourth rotating plate 92 to rotate, and the liquid strength in the multi-stage pump body 4 will not continue to increase. The third rotating plate 91 can continue to rotate with the drive motor 3. At this time, the drive motor 3 can be turned off in time.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel oil relay pump, comprising a bottom support base plate (1) and a drive motor (3) and a multi-stage pump body (4) mounted on the bottom support base plate (1) via a fixed base (2), characterized in that: It also includes, The winding soft start structure (7) has a first rotating plate (71) that rotates with the rotor of the drive motor (3), a second rotating plate (72) that rotates with the first rotating plate (71), and a winding cable (75) that generates a linkage effect after winding. The pneumatic telescopic structure (8) is provided with a transverse hollow rod (81) that rotates with the second rotating plate (72), a main piston body (86) that can move away from the second rotating plate (72) after gas is injected, and a polygonal telescopic rod (89) that moves laterally with the main piston body (86). And the contact linkage structure (9), which is provided with a third rotating plate (91) that rotates with the polygonal telescopic rod (89), a fourth rotating plate (92) that drives the rotor of the multi-stage pump body (4) to rotate, a number of semi-cylindrical protrusions (95) provided on the end face of the third rotating plate (91), and a number of semi-cylindrical grooves (96) that allow the semi-cylindrical protrusions (95) to be inserted into its interior.

2. The novel oil relay pump according to claim 1, characterized in that: The winding soft-start structure (7) includes a first rotating plate (71) and a second rotating plate (72). One end face of the first rotating plate (71) is provided with a rotor fixing groove (73) for fixing the rotor of the drive motor (3). A first rotating shaft (74) is fixedly installed at the center of one end face of the second rotating plate (72). The first rotating shaft (74) is installed on the upper surface of the bottom support base plate (1) through a bearing and a fixing base (2). Three winding cables (75) arranged in a ring array and generating a linkage effect after winding are connected between the opposite end faces of the first rotating plate (71) and the second rotating plate (72).

3. A novel oil relay pump according to claim 2, characterized in that: In the initial state, the length of the winding cable (75) is greater than the lateral distance between the first rotating plate (71) and the second rotating plate (72).

4. A novel oil relay pump according to claim 3, characterized in that: The pneumatic telescopic structure (8) includes a transverse hollow rod (81). One end of the transverse hollow rod (81) is provided with a shaft fixing groove (82) for fixing the first rotating shaft (74). The interior of the transverse hollow rod (81) is provided with a main transverse hollow movable cavity (85). A gas limiting flow cavity (83) is provided on one end face of the transverse hollow rod (81) near the shaft fixing groove (82). A gas flow channel (84) is provided on the circumferential side of the transverse hollow rod (81) and is integral with the transverse hollow rod (81) and communicates with the gas limiting flow cavity (83). The other end of the transverse hollow rod (81) is... The end is provided with a polygonal rod hole (87) that connects to the transverse hollow movable cavity (85). The transverse hollow rod (81) has a main piston body (86) that can move laterally along the transverse hollow movable cavity (85) placed inside the transverse hollow movable cavity (85). A polygonal telescopic rod (89) that passes through the polygonal rod hole (87) is fixedly installed on one end face of the main piston body (86). A main helical spring (88) in a compressed state is placed around the rod body inside the transverse hollow movable cavity (85). The main helical spring (88) generates elastic pressure on the main piston body (86) in the direction of the gas limiting flow cavity (83).

5. A novel oil relay pump according to claim 4, characterized in that: The cross-sectional shape of the polygonal rod hole (87) is consistent with the cross-sectional shape of the polygonal telescopic rod (89), both being polygonal structures, and the structural dimensions of the cross-sectional shape of the polygonal rod hole (87) match the structural dimensions of the cross-sectional shape of the polygonal telescopic rod (89).

6. A novel oil relay pump according to claim 5, characterized in that: The contact linkage structure (9) includes a third rotating plate (91) and a fourth rotating plate (92). One end face of the third rotating plate (91) is provided with a polygonal fixing groove (93) for fixing and installing a polygonal telescopic rod (89). One end face of the fourth rotating plate (92) is fixedly installed with a second rotating shaft (94) that is connected to the rotor of the multi-stage pump body (4) through a coupling. The other end of the third rotating plate (91) is provided with a plurality of annular array semi-cylindrical protrusion structures (95) that are integral with the third rotating plate (91). The other end of the fourth rotating plate (92) is provided with a plurality of annular array semi-cylindrical groove structures (96) for holding the semi-cylindrical protrusion structures (95).

7. A novel oil relay pump according to claim 6, characterized in that: The semi-cylindrical protrusion structure (95) and the semi-cylindrical groove structure (96) have the same structural shape, both being semi-cylindrical structures.

8. A novel oil relay pump according to any one of claims 1-7, characterized in that: It also includes a water hammer effect weakening structure (10), which is provided with a liquid discharge hole (1011) for discharging oil from the discharge port of the multi-stage pump body (4), a cylindrical elastic gas film (106) provided on the circumferential side of the liquid discharge hole (1011) and expanding outward after the pressure of the flowing liquid increases, a buffer solution filling the closed area outside the cylindrical elastic gas film (106), a secondary piston body (109) that undergoes lateral displacement with the pressure of the buffer solution, and a secondary helical spring (1010) that provides a buffer damping effect to the secondary piston body (109).

9. A novel oil relay pump according to claim 8, characterized in that: The water hammer effect mitigation structure (10) includes a longitudinal hollow column (101). At the center of the bottom end of the longitudinal hollow column (101) is an inlet channel (102) integral with the longitudinal hollow column (101) and connected to the drain port (6) of the multi-stage pump body (4). At the center of the top end of the longitudinal hollow column (101) is a drain channel (103) integral with the longitudinal hollow column (101). The longitudinal hollow column (101), the inlet channel (102), and the drain channel (103) are integrated into the structure. A liquid discharge hole (1011) for oil flow is provided at the center of the liquid channel (103). An annular liquid reserved cavity (104) is provided in the middle region of the longitudinal hollow column (101) around the liquid discharge hole (1011). A cylindrical elastic gas film (106) is embedded in the longitudinal hollow column (101) at the intersection of the liquid discharge hole (1011) and the annular liquid reserved cavity (104). A circular side surface of the longitudinal hollow column (101) is provided with A transverse hollow column (105) is integrally formed with the longitudinal hollow column (101). The transverse hollow column (105) has a secondary transverse hollow flow cavity (107) inside. The longitudinal hollow column (101) has a liquid compensation hole (108) inside that connects the annular liquid reserved cavity (104) and the secondary transverse hollow flow cavity (107). The transverse hollow column (105) has a liquid flow cavity (108) located inside the secondary transverse hollow flow cavity (107) that can flow along the secondary transverse hollow cavity. The auxiliary piston body (109) of the cavity (107) moves axially. The interior of the longitudinal hollow column (101) and the transverse hollow column (105) is filled with buffer solution in the closed area between the auxiliary piston body (109) and the cylindrical elastic gas film (106). The transverse hollow column (105) has an auxiliary helical spring (1010) that generates elastic pressure on the auxiliary piston body (109) in the direction of the liquid compensation hole (108) inside the auxiliary transverse hollow flow cavity (107).

10. A novel oil relay pump according to claim 9, characterized in that: The tubular elastic air membrane (106) is a tubular structure made of elastic rubber.

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