A high-pressure combined multi-stage pump

Abstract

The present invention belongs to the technical field of high-pressure pumps, and relates to a high-pressure combined multi-stage pump. The present invention includes a plurality of high-pressure pumps connected in sequence, each of which is provided with a plurality of liquid storage boxes for storing lubricating oil, the plurality of liquid storage boxes are connected in sequence, and the liquid storage box at the head end is connected with an air pump, each liquid storage box is connected with the high-pressure pump through a liquid outlet pipe, each liquid outlet pipe is provided with a pressure valve, and the opening pressures of the plurality of pressure valves are all different, a temperature sensor is provided in the high-pressure pump, and the output air pressure of the air pump is adjusted according to the temperature value measured by the temperature sensor, the higher the temperature value measured by the temperature sensor, the greater the output air pressure of the air pump, and the more the number of pressure valves opened, the more lubricating oil is added to the high-pressure pump. The connection between the first connecting pipe and the second connecting pipe can be completed by pushing the sliding sleeve to the left. The first connecting pipe and the second connecting pipe can be disconnected by pulling the limit plate upward. The installation and removal of the liquid storage box are both relatively fast and convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of high-pressure pumps and relates to a high-pressure combined multi-stage pump. Background Art

[0002] The high-pressure combined multistage pump is a high-pressure pump system composed of multiple pump units. It has the advantages of strong flexibility, high efficiency and good reliability. It is usually used in industrial applications requiring high pressure and large flow.

[0003] During the use of high-pressure combined multi-stage pumps, the internal power components will consume the surface lubricating oil rapidly due to long-term reciprocating motion. If the lubricating oil cannot be replenished in time, the internal friction will increase, and the greater friction will accelerate the wear of the parts. In addition, the friction generates heat, which increases the temperature of the pump group, affecting the working efficiency of the pump group. Continuous high temperature will cause damage to the components in the pump group and shorten the service life of the pump group. Due to the complex structure of the high-pressure combined multi-stage pump, when one of the pump core components fails, due to the interaction and influence between the various pump core components, troubleshooting and repair may be difficult, increasing the difficulty and cost of maintenance.

[0004] A high-pressure pump with a wear-resistant structure is disclosed in the patent document with publication number CN114738269A, including a high-pressure pump body, a lubricating structure, a connecting hose, a transmission pipe, a mounting assembly and an adjusting assembly. When in use, the device is first installed on the high-pressure pump body, and then the connecting hose is connected through a three-way pipe and connected to an external air pump. After the high-pressure pump body has been used for a period of time, the external air pump can be started so that the air pump can convey airflow into the liquid storage box through the connecting hose, thereby increasing the air pressure inside the liquid storage box. The sealing plug moves down under the drive of the air pressure, so that the transmission pipe remains in an open state. At this time, the lubricating oil in the liquid storage box drips along the transmission pipe onto the piston rod inside the high-pressure pump body to replenish the lubricating liquid for the piston rod. However, when the device is in use, there are the following problems: the lubricating oil cannot be supplemented in an appropriate amount according to the actual situation, which will cause the situation where too much lubricating oil is supplemented.

[0005] In order to solve the above problems, the present invention proposes a high-pressure combined multi-stage pump. Summary of the invention

[0006] In order to solve the problems existing in the background technology, the present invention proposes a high-pressure combined multi-stage pump.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A high-pressure combined multi-stage pump comprises a plurality of high-pressure pumps connected in sequence, each of which is provided with a plurality of liquid storage boxes for storing lubricating oil, the plurality of liquid storage boxes are connected in sequence, and the liquid storage box at the head end is connected with an air pump, each liquid storage box is connected with the high-pressure pump through a liquid outlet pipe, each liquid outlet pipe is provided with a pressure valve, the opening pressures of the plurality of pressure valves are all different, a temperature sensor is provided in the high-pressure pump, the temperature sensor and the air pump are electrically connected to a controller, and the output air pressure of the air pump is adjusted according to the temperature value measured by the temperature sensor, the higher the temperature value measured by the temperature sensor, the greater the output air pressure of the air pump, and thus the more pressure valves are opened, and the more lubricating oil is replenished into the high-pressure pump.

[0009] Furthermore, a first connecting tube is installed on the left side of each liquid storage box, and a second connecting tube is installed on the right side; between two adjacent liquid storage boxes, the first connecting tube and the second connecting tube are connected by a connecting assembly, and the connecting assembly includes a sliding sleeve, a fixing block, a closing plate and a limiting plate.

[0010] The sliding sleeve seal is arranged on the first connecting tube, the fixing block is fixedly mounted on the sliding sleeve, a through groove and a limiting groove connected with the through groove are provided on the fixing block, the length direction of the through groove is parallel to the axial direction of the first connecting tube, the through groove is connected with the inside of the sliding sleeve; the limiting groove is located at one end of the through groove close to the corresponding liquid storage box, and the through groove extends into the limiting groove;

[0011] The closing plate is elastically rotatably installed in the second connecting tube, and the rotation axis of the closing plate is perpendicular to the axis of the second connecting tube. A spline sleeve is fixedly installed on the closing plate, and a through hole is opened on the second connecting tube. The spline sleeve is rotatably set in the through hole. A spline rod is elastically slidably connected in the spline sleeve, and one end of the spline rod away from the closing plate extends to the outside of the second connecting tube and is fixedly connected to the limit plate; the spline rod is slidably matched with the through groove, and the limit plate is adapted to the limit groove.

[0012] Furthermore, a first inclined surface is provided at one end of the fixing block away from the corresponding liquid storage box. When the limiting plate slides along the through groove, the limiting plate gradually moves away from the second connecting pipe under the guidance of the first inclined surface.

[0013] Furthermore, a second guide curved surface is provided on a side wall of the limiting groove close to the through groove, and a fixing plate is fixedly provided on one end of the fixing block close to the corresponding liquid storage box, and a second inclined surface and a first guide curved surface are provided on the fixing plate; initially, the closing plate blocks the second connecting pipe, and when the sliding sleeve is pushed to the left to make the limiting plate slide along the through groove in a direction close to the fixing plate, when one end of the limiting plate contacts the second inclined surface, under the guiding action of the second inclined surface, the limiting plate rotates, and after the limiting plate contacts and cooperates with the first guide curved surface and the second guide curved surface, the limiting plate moves along the first guide curved surface and the second guide curved surface in a direction close to the closing plate and is stuck in the limiting groove;

[0014] The limiting plate drives the closing plate to rotate through the spline rod, so that the second connecting pipe is opened.

[0015] Furthermore, two slideways are symmetrically provided on the first connecting tube, and two protrusions are fixedly connected to the end of the sliding sleeve, and the two protrusions correspond to the two slideways one by one, and the protrusions are slidably arranged in the corresponding slideways; a spring is arranged in each slideway, and one end of the spring is fixedly connected to the corresponding protrusion, and the other end of the spring is fixedly connected to an end wall of the slideway. When the sliding sleeve is pulled to the left, the protrusion moves to the left along the slideway, the spring is stretched, and the sliding sleeve moves to the left and approaches the corresponding second connecting tube, and is sleeved on the connecting tube. When the first connecting tube is disconnected from the second connecting tube, the limit of the sliding sleeve is released, and under the action of the spring, the sliding sleeve quickly slides to the right and disengages from the second connecting tube, thereby disconnecting the first connecting tube from the second connecting tube.

[0016] Furthermore, a handle is provided at the upper end of the limiting plate to facilitate pulling the limiting plate.

[0017] Furthermore, a receiving groove connected to the spline sleeve is provided on the closing plate, a tension spring is arranged in the receiving groove, one end of the tension spring is fixedly connected to the spline sleeve, and the other end of the tension spring is fixedly connected to the bottom wall of the receiving groove.

[0018] Furthermore, a sealing ring is provided on the liquid outlet pipe to ensure a sealing fit between the liquid outlet pipe and the communicating hole.

[0019] Furthermore, a liquid filling port is provided at the top of each liquid storage box, and a sealing cover is provided at the liquid filling port. By opening the sealing cover, lubricating oil can be added to the liquid storage box through the liquid filling port. By covering the sealing cover, the liquid filling port is blocked to prevent foreign impurities from entering the liquid storage box.

[0020] Furthermore, a second connecting pipe is provided at the output end of the air pump, and the second connecting pipe is connected to the first connecting pipe at the head end through a connecting assembly.

[0021] Compared with the prior art, the present invention has the following beneficial effects: by setting the start time of the air pump, the lubricating oil can be replenished to the piston rod in the high-pressure pump at a regular time, thus avoiding damage caused by untimely replenishment of the lubricating oil.

[0022] When the high-pressure pump runs for a while, the lubricating oil on the piston rod will gradually decrease, and the friction of the piston rod will increase during operation, causing the temperature of the high-pressure pump to rise. When the air pump is turned on, the air pressure output by the air pump will be controlled according to the measurement value of the current temperature sensor, and then the number of pressure valves opened will be controlled to add the appropriate amount of lubricating oil according to the actual situation.

[0023] By pushing the sliding sleeve to the left, the first connecting tube and the second connecting tube can be connected, and the first connecting tube and the second connecting tube can be connected at the same time. By pulling the limit plate upward, the first connecting tube and the second connecting tube can be disconnected, and the second connecting tube can be blocked at the same time. The installation and removal of the liquid storage box are both relatively fast and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the external structure of a single high-pressure pump in the present invention;

[0026] Figure 3 It is a schematic diagram of the connection of multiple liquid storage boxes in the present invention;

[0027] Figure 4 The present invention Figure 3 A magnified view of part A;

[0028] Figure 5 It is a schematic diagram of the external structure of the liquid storage box in the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the liquid outlet pipe in the present invention;

[0030] Figure 7 It is a schematic diagram of the internal structure of the liquid storage box of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the fixed block in the present invention;

[0032] Fig. 9 is a schematic diagram of the connection between the sliding sleeve and the first connecting pipe in the present invention;

[0033] Fig.10 It is a structural schematic diagram of the limiting plate in the present invention;

[0034] Fig.11 is a partial cross-sectional view of the second connecting pipe in the present invention;

[0035] Fig.12 is a schematic diagram of the state when the limiting plate contacts the first inclined surface in the present invention;

[0036] Fig.13 It is a schematic diagram of the state when the limiting plate and the top surface of the fixing block in the present invention are matched;

[0037] Fig.14 is a schematic diagram of a state in which the right end of the limiting plate in the present invention contacts the second inclined surface;

[0038] Fig.15It is a schematic diagram of the state when the limiting plate cooperates with the first guide curved surface and the second guide curved surface in the present invention;

[0039] Fig.16 It is a schematic diagram of the state in which the limiting plate of the present invention is inserted into the limiting groove.

[0040] In the figure: 1. high-pressure pump; 2. liquid storage box; 3. liquid outlet pipe; 4. sealing ring; 5. pressure valve; 6. sealing cover; 7. first connecting pipe; 8. sliding sleeve; 9. slideway; 10. spring; 11. fixing block; 12. first inclined surface; 13. through groove; 14. limiting groove; 15. fixing plate; 16. second inclined surface; 17. first guide curved surface; 18. second guide curved surface; 19. second connecting pipe; 20. closing plate; 21. splined bushing; 22. splined rod; 23. tension spring; 24. limiting plate; 25. handle; 26. fixing seat; 27. air pump. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figure 1-Figure 16 A high-pressure combined multi-stage pump is shown.

[0043] Embodiment 1: The technical solution adopted by the present invention is as follows: A high-pressure combined multi-stage pump comprises a plurality of high-pressure pumps 1, and the plurality of high-pressure pumps 1 are connected in sequence to form a high-pressure combined multi-stage pump.

[0044] Each high-pressure pump 1 is provided with a plurality of liquid storage boxes 2, which are used to store lubricating oil. A liquid filling port is provided on the liquid storage box 2, and a sealing cover 6 is provided on the liquid storage box 2. By opening the sealing cover 6, lubricating oil can be added to the liquid storage box 2 through the liquid filling port. By covering the sealing cover 6, the liquid filling port is blocked to prevent foreign impurities from entering the liquid storage box 2.

[0045] Multiple liquid storage boxes 2 are connected in sequence from left to right, and the liquid storage box 2 at the head end, that is, the liquid storage box 2 at the far left, is connected to the output end of the air pump 27, and the air pump 27 is arranged on the high-pressure pump 1. A plurality of communication holes are provided at positions corresponding to the reciprocating components on the high-pressure pump 1, and the plurality of communication holes correspond to the plurality of liquid storage boxes 2 one by one. Each liquid storage box 2 is connected to a liquid outlet pipe 3, and the liquid outlet pipe 3 extends into the corresponding communication hole. A sealing ring 4 is sleeved on the liquid outlet pipe 3 to make the liquid outlet pipe 3 and the communication hole seal. A pressure valve 5 is arranged in the liquid outlet pipe 3, and the lubricating oil in the liquid storage box 2 enters the high-pressure pump 1 through the pressure valve 5 and the liquid outlet pipe 3, so as to replenish the lubricating oil for the piston rod in the high-pressure pump 1. The air pump 27 inputs gas into the liquid storage box 2, so that the air pressure in the liquid storage box 2 increases, and the pressure on the pressure valve 5 increases, and then the pressure valve 5 opens.

[0046] In this embodiment, there are four liquid storage boxes 2, which are arranged on the high pressure pump 1 in sequence, and are connected in sequence from left to right. The air pump 27 is connected to the liquid storage box 2 at the leftmost end and the first end.

[0047] The opening pressures of multiple pressure valves 5 are all different. In this embodiment, the opening pressures of multiple pressure valves 5 from the head end to the tail end, that is, from left to right, increase in sequence, that is, the opening pressure of the pressure valve 5 on the head end liquid storage box 2 is the smallest, and a smaller pressure can open the head end pressure valve 5. The opening pressure of the pressure valve 5 on the tail end liquid storage box 2 is the largest, and a larger pressure is required to open the tail end pressure valve 5. A temperature sensor is provided in the high-pressure pump 1, and the temperature sensor and the air pump 27 are both electrically connected to the controller. When the high-pressure pump 1 is working, the opening time of the air pump 27 is set so that the air pump 27 is opened once every certain period of time, and the lubricating oil is regularly added to the piston rod in the high-pressure pump 1. When the lubricating oil on the piston rod in the high-pressure pump 1 is less, the friction force on the piston rod during operation is greater, and more heat is generated. At this time, the temperature value measured by the temperature sensor is larger, and the controller controls the air pressure at the output end after the air pump 27 is turned on according to the received temperature value. The greater the temperature value measured by the temperature sensor, the greater the air pressure at the output end of the air pump 27, and the greater the gas pressure entering the liquid storage box 2, so that more pressure valves 5 are opened, and more lubricating oil is added to the piston rod to lubricate the piston rod. The friction of the piston rod due to the lack of lubricating oil for a long time is prevented from increasing, which causes the wear of the internal components of the high-pressure pump 1, and the temperature in the high-pressure pump 1 is prevented from further rising, providing a guarantee for the normal operation of the high-pressure pump 1. If there is still a lot of lubricating oil on the piston rod in the high-pressure pump 1, due to the lubricating effect of the lubricating oil, the friction force on the piston rod during operation is small, and the heat generated by friction is small. At this time, the temperature value measured by the temperature sensor is small. The smaller the temperature value measured by the temperature sensor, the smaller the air pressure at the output end of the air pump 27, and the smaller the gas pressure entering the liquid storage box 2, so that fewer pressure valves 5 are opened, and less lubricating oil is added to the piston rod, avoiding the adverse effects caused by too much lubricating oil added.

[0048] The left side of the liquid storage box 2 is connected to the first connecting tube 7, the right side of the liquid storage box 2 and the output end of the air pump 27 are connected to the second connecting tube 19, and the first connecting tube 7 and the second connecting tube 19 are connected between two adjacent liquid storage boxes 2 and between the output end of the air pump 27 and the liquid storage box 2 at the head end through a connecting assembly. The axis of the first connecting tube 7 and the axis of the second connecting tube 19 are on the same straight line.

[0049] The connection assembly includes a sleeve 8, a fixed block 11, a closing plate 20 and a limit plate 24. The sleeve 8 is sealed and slidably sleeved on the left end of the first connecting tube 7. Specifically, the outer side surface of the first connecting tube 7 is parallel to the axial direction and symmetrically provided with two slideways 9, and the right end of the sleeve 8 is fixedly connected with two protrusions, and the two protrusions correspond to the two slideways 9 one by one, and each protrusion is elastically slidably arranged in the corresponding slideway 9. A spring 10 is arranged in the slideway 9, one end of the spring 10 is fixedly connected to the protrusion, and the other end of the spring 10 is fixedly connected to the left end wall of the slideway 9.

[0050] Pull the sliding sleeve 8 to the left, the protrusion moves to the left along the slideway 9, the spring 10 is stretched, the sliding sleeve 8 moves to the left and approaches the corresponding second connecting tube 19, and is sleeved on the connecting tube 19. When the first connecting tube 7 is disconnected from the second connecting tube 19, the limit of the sliding sleeve 8 is released, and under the action of the spring 10, the sliding sleeve 8 quickly slides to the right and disengages from the second connecting tube 19, thereby disconnecting the first connecting tube 7 from the second connecting tube 19.

[0051] The closing plate 20 is elastically rotatably mounted in the second connecting tube 19. Specifically, a rotation groove is provided on the inner wall of the second connecting tube 19, and a rotating rod is fixedly mounted on the closing plate 20. The rotating rod is rotatably arranged in the rotation groove, and a torsion spring is sleeved on the rotating rod, and the torsion spring is fixedly connected between the slideway 9 and the closing plate 20. The rotating rod is perpendicular to the axis of the second connecting tube 19. Under the action of the torsion spring, the closing plate 20 is coaxial with the second connecting tube 19, and the closing plate 20 blocks the second connecting tube 19. A through hole is provided at one end of the second connecting tube 19 away from the rotation groove, and a spline sleeve 21 is fixedly mounted on the closing plate 20, and the spline sleeve 21 is sealingly rotatably connected to the through hole. The axis of the spline sleeve 21 is on the same straight line as the axis of the rotating rod. A spline rod 22 is slidably arranged in the spline sleeve 21, and the end of the spline rod 22 away from the closing plate 20 extends to the outside of the second connecting tube 19 and is fixedly connected to the limit plate 24. A handle 25 is fixedly connected to the limit plate 24. The handle 25 is provided to facilitate the operation of the limiting plate 24. When the closing plate 20 blocks the second connecting pipe 19, the length direction of the limiting plate 24 is parallel to the axial direction of the second connecting pipe 19.

[0052] The closing plate 20 is provided with a receiving groove, in which a tension spring 23 is arranged, one end of the tension spring 23 is fixedly connected to the spline rod 22, and the other end of the tension spring 23 is fixedly connected to the bottom wall of the receiving groove. Under the action of the tension spring 23, the limit plate 24 is closely attached to the outer surface of the spring 10.

[0053] The fixing block 11 is fixedly mounted on the sliding sleeve 8. A through groove 13 and a limiting groove 14 are provided on the fixing block 11. The through groove 13 passes through the sliding sleeve 8 and is connected to the inside of the sliding sleeve 8. The length direction of the through groove 13 is parallel to the axial direction of the first connecting pipe 7, and the spline rod 22 is slidably matched with the through groove 13. The through groove 13 is connected to the limiting groove 14 and the through groove 13 extends into the limiting groove 14. The limiting groove 14 is located at the right end of the through groove 13. The length direction of the limiting groove 14 is perpendicular to the length direction of the through groove 13. The limiting groove 14 is adapted to the limiting plate 24. The width of the limiting plate 24 is greater than the width of the through groove 13.

[0054] When the corresponding first connecting tube 7 and the second connecting tube 19 are connected, the staff pushes the sliding sleeve 8 with one hand to move the sliding sleeve 8 to the left and close to the corresponding second connecting tube 19. When the limit block 24 contacts the fixed block 11, the staff pulls the limit block 24 outward with the other hand to move the limit block 24 to the top of the fixed block 11, so that the sliding sleeve 8 can continue to move to the left. Then the sliding sleeve 8 is pushed to the left, and the spline rod 22 moves along the through groove 13. When the limit block 24 is located above the limit groove 14, the limit block 24 is rotated to rotate 90 degrees. After that, the person gradually releases the tension on the limit block 24. Under the action of the tension spring 23, the spline rod 22 moves along the spline sleeve 21 toward the closing plate 20, and the limit block 24 is inserted into the limit groove 14. Then, the force on the sliding sleeve 8 is released. At this time, under the action of the limit block 24, the sliding sleeve 8 cannot move to the right under the action of the spring 10, so that the sliding sleeve 8 is sleeved on the second connecting pipe 19, and the connection between the first connecting pipe 7 and the second connecting pipe 19 is realized. When the limit block 24 rotates, the limit block 24 drives the closing plate 20 to rotate through the spline rod 22 and the spline sleeve 21, and the second connecting pipe 19 is opened, so that the first connecting pipe 7 and the second connecting pipe 19 are connected.

[0055] Working principle: Initially, under the action of the torsion spring, the closing plate 20 blocks the second connecting tube 19, and the length direction of the limiting plate 24 is parallel to the axial direction of the second connecting tube 19. Under the action of the tension spring 23, the limiting plate 24 is tightly attached to the outer surface of the second connecting tube 19.

[0056] When installing the liquid storage box 2, firstly, a communication hole is opened at the corresponding position of the high pressure pump 1 and the transmission assembly, and then the liquid outlet pipe 3 is extended into the corresponding communication hole. The liquid storage box 2 at the front end and the liquid storage box 2 at the rear end are fixedly connected to the high pressure pump 1 through the fixing seat 26.

[0057] Then the air pump 27 is connected to the liquid storage box 2 at the head end and the adjacent liquid storage box 2. The specific operation is as follows: the staff pushes the sliding sleeve 8 with one hand to make the sliding sleeve 8 move to the left and approach the corresponding second connecting pipe 19. When the limit block 24 contacts the fixed block 11, the staff pulls the limit block 24 outward with the other hand to make the limit block 24 move to the top of the fixed block 11. When the limit block 24 moves outward, the spline rod 22 moves outward along the spline shaft sleeve 21, and the tension spring 23 is stretched and deformed. Then continue to push the sliding sleeve 8 to the left. When the sliding sleeve 8 moves to the left, it moves along the through groove 13 with the spline rod 22. When the limit block 24 is located above the limit groove 14, rotate the limit block 24 to rotate the limit block 24 90 degrees. After that, the person gradually releases the pulling force on the limit block 24 by hand. Under the action of the tension spring 23, the spline rod 22 moves along the spline sleeve 21 towards the closing plate 20, and the limit block 24 is inserted into the limit groove 14. Then the force on the sleeve 8 is released. At this time, under the action of the limit block 24, the sleeve 8 cannot move to the right under the action of the spring 10, so that the sleeve 8 is fixedly connected to the second connecting tube 19, thereby realizing the connection between the first connecting tube 7 and the second connecting tube 19.

[0058] When the limiting plate 24 rotates, the limiting plate 24 drives the closing plate 20 to rotate through the spline sleeve 21 and the spline rod 22, the second connecting pipe 19 is opened, and the first connecting pipe 7 and the second connecting pipe 19 are connected.

[0059] In this way, the first connecting pipes 7 are all connected to the corresponding second connecting pipes 19, and the first connecting pipes 7 are connected to the second connecting pipes 19. Then, the output end of the air pump 27 is connected to the liquid storage box 2 at the head end, and the adjacent liquid storage boxes 2 are connected. The second connecting pipe 19 on the right side of the liquid storage box 2 at the end, that is, the rightmost liquid storage box 2, is in a closed state.

[0060] When the high-pressure pump 1 is working, the opening time of the air pump 27 is set so that the air pump 27 runs once every period of time. The air pump 27 delivers gas to the liquid storage box 2, so that the air pressure in the liquid storage box 2 increases, and the pressure on the pressure valve 5 increases. When the pressure on the pressure valve 5 is greater than the opening pressure, the pressure valve 5 opens, and the lubricating oil in the pressure valve 5 flows out through the pressure valve 5 and the liquid outlet pipe 3 and drips onto the piston rod, replenishing the lubricating oil for the piston rod and lubricating the piston rod. By regularly starting the air pump 27, the lubricating oil can be regularly replenished for the piston rod to avoid the aggravation of wear caused by untimely replenishment of the lubricating oil.

[0061] After the high-pressure pump 1 has been running for a while, the lubricating oil on the piston rod will gradually decrease, and the friction of the piston rod during operation will increase, causing the temperature of the high-pressure pump 1 to rise. The less lubricating oil there is on the piston rod, the greater the friction it will experience during operation, and the higher the temperature of the high-pressure pump 1. The temperature sensor measures the temperature inside the high-pressure pump 1. When the air pump 27 is turned on, the output air pressure after the air pump 27 is turned on is controlled according to the measured value of the current temperature sensor. The larger the measured value of the temperature sensor, the greater the air pressure at the output end after the air pump 27 is turned on. Then more pressure valves 5 are opened to allow more lubricating oil to be added to the piston rod.

[0062] The sealing cover 6 can be opened to add lubricating oil to the liquid storage box 2, but the height of the lubricating oil in the liquid storage box 2 must be lower than the lower side of the first connecting tube 7 and the second connecting tube 19 to prevent the lubricating oil in the liquid storage box 2 from flowing into the first connecting tube 7 or the second connecting tube 19.

[0063] When the liquid storage box 2 needs to be disassembled, the handle 25 is pulled upward to make the limiting plate 24 disengage from the limiting groove 14. Afterwards, under the action of the spring 10, the sliding sleeve 8 moves toward the direction close to the corresponding liquid storage box 2, and the sliding sleeve 8 is separated from the corresponding second connecting tube 19. Then the handle 25 is released, and under the action of the tension spring 23, the limiting plate 24 moves toward the direction close to the second connecting tube 19, and at the same time, under the action of the torsion spring, the closing plate 20 rotates, and the closing plate 20 drives the limiting plate 24 to rotate until the closing plate 20 blocks the second connecting tube 19. The connection assembly can realize the rapid connection and disassembly of adjacent liquid storage boxes 2.

[0064] Embodiment 2: This embodiment is an improvement based on embodiment 1.

[0065] The left end of the fixed block 11 is provided with a first inclined surface 12. The right end of the fixed block 11 is fixed with a fixed plate 15, on which a second inclined surface 16 and a first guide curved surface 17 are provided, the right end of the second inclined surface 16 is inclined away from the limiting groove 14, and the first guide curved surface 17 is located below the second inclined surface 16. A second guide curved surface 18 is provided on the inner wall of the limiting groove 14 on the side opposite to the fixed plate 15.

[0066] Initially, under the action of the torsion spring, the closing plate 20 blocks the second connecting tube 19, and the length direction of the limiting plate 24 is parallel to the axial direction of the second connecting tube 19. Under the action of the tension spring 23, the limiting plate 24 is tightly attached to the outer surface of the second connecting tube 19.

[0067] When installing the liquid storage box 2, firstly, a communication hole is opened at the corresponding position of the high pressure pump 1 and the transmission assembly, and then the liquid outlet pipe 3 is extended into the corresponding communication hole. The liquid storage box 2 at the front end and the liquid storage box 2 at the rear end are fixedly connected to the high pressure pump 1 through the fixing seat 26.

[0068] Then the air pump 27 is connected with the liquid storage box 2 at the head end and the adjacent liquid storage box 2. The specific operation is as follows: push the sliding sleeve 8 to the left, and the fixed block 11 gradually approaches the limit plate 24. When the limit plate 24 contacts the first inclined surface 12, the limit plate 24 slides along the first inclined surface 12. Under the guidance of the first inclined surface 12, the limit plate 24 gradually moves away from the closing plate 20, and the spline rod 22 slides outward of the spline shaft sleeve 21. The tension spring 23 stretches and deforms until the limit plate 24 contacts the top surface of the fixed block 11, and then the limit plate 24 slides along the top surface of the fixed block 11. After the spline rod 22 is located in the through groove 13, the spline rod 22 slides along the through groove 13. After the right end of the limit plate 24 contacts the second inclined surface 16, the sliding sleeve 8 is pushed to the left, so that the limit plate 24 continues to slide along the through groove 13. Under the guidance of the second inclined surface 16, the limit plate 24 rotates clockwise until the limit plate 24 contacts and cooperates with the first guide curved surface 17 and the second guide curved surface 18. Afterwards, under the action of the tension spring 23, the limit plate 24 moves toward the closing plate 20. Under the guidance of the first guide curved surface 17 and the second guide curved surface 18, the limit plate 24 further rotates clockwise until the limit plate 24 is stuck in the limit groove 14, and then the thrust on the sliding sleeve 8 can be released, and the first connecting pipe 7 and the second connecting pipe 19 are connected together through the sliding sleeve 8.

[0069] When the limit plate 24 rotates, the limit plate 24 drives the closing plate 20 to rotate through the spline sleeve 21 and the spline rod 22, and the second connecting tube 19 is opened. The first connecting tube 7 is connected to the second connecting tube 19. Then the output end of the air pump 27 is connected to the liquid storage box 2 at the head end, and the adjacent liquid storage boxes 2 are connected. By setting the first inclined surface 12, the second inclined surface 16, the first guide curved surface 17 and the second guide curved surface 18, the staff can complete the connection of the first connecting tube 7 and the second connecting tube 19 by pushing the sliding sleeve 8 with one hand, which is simple, convenient and fast.

[0070] When the liquid storage box 2 needs to be disassembled, the handle 25 is pulled upward to make the limiting plate 24 disengage from the limiting groove 14. Afterwards, under the action of the spring 10, the sliding sleeve 8 moves toward the direction close to the corresponding liquid storage box 2, and the sliding sleeve 8 is separated from the corresponding second connecting tube 19. Then the handle 25 is released, and under the action of the tension spring 23, the limiting plate 24 moves toward the direction close to the second connecting tube 19, and at the same time, under the action of the torsion spring, the closing plate 20 rotates, and the closing plate 20 drives the limiting plate 24 to rotate until the closing plate 20 blocks the second connecting tube 19. The connection assembly can realize the rapid connection and disassembly of adjacent liquid storage boxes 2.

[0071] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-pressure combined multi-stage pump, comprising a plurality of high-pressure pumps (1) connected in sequence, characterized in that: Each high-pressure pump (1) is provided with a plurality of liquid storage boxes (2) for storing lubricating oil. The plurality of liquid storage boxes (2) are connected in sequence, and the liquid storage box (2) at the head end is connected to an air pump (27). Each liquid storage box (2) is connected to the high-pressure pump (1) via a liquid outlet pipe (3). Each liquid outlet pipe (3) is provided with a pressure valve (5). The opening pressures of the plurality of pressure valves (5) are different. A temperature sensor is provided in the high-pressure pump (1). The temperature sensor and the air pump (27) are electrically connected to a controller. The output air pressure of the air pump (27) is adjusted according to the temperature value measured by the temperature sensor. The higher the temperature value measured by the temperature sensor, the greater the output air pressure of the air pump (27). Thus, the greater the number of pressure valves (5) opened, and the more lubricating oil is replenished into the high-pressure pump (1). A first connecting tube (7) is installed on the left side of each liquid storage box (2), and a second connecting tube (19) is installed on the right side of each liquid storage box (2); between two adjacent liquid storage boxes (2), the first connecting tube (7) and the second connecting tube (19) are connected by a connecting assembly, wherein the connecting assembly comprises a sliding sleeve (8), a fixing block (11), a closing plate (20) and a limiting plate (24). The sliding sleeve (8) is sealed and slidably sleeved on the first connecting tube (7); the fixing block (11) is fixedly mounted on the sliding sleeve (8); a through groove (13) and a limiting groove (14) communicating with the through groove (13) are formed on the fixing block (11); the length direction of the through groove (13) is parallel to the axial direction of the first connecting tube (7); the through groove (13) is communicated with the interior of the sliding sleeve (8); the limiting groove (14) is located at one end of the through groove (13) close to the corresponding liquid storage box (2); the through groove (13) extends into the limiting groove (14); The closing plate (20) is elastically rotatably mounted in the second connecting tube (19), the rotation axis of the closing plate (20) is perpendicular to the axis of the second connecting tube (19), a spline shaft sleeve (21) is fixedly mounted on the closing plate (20), a through hole is formed on the second connecting tube (19), the spline shaft sleeve (21) is rotatably mounted in the through hole, a spline rod (22) is elastically slidably connected in the spline shaft sleeve (21), one end of the spline rod (22) facing away from the closing plate (20) extends to the outside of the second connecting tube (19) and is fixedly connected to the limit plate (24); the spline rod (22) is slidably matched with the through groove (13), and the limit plate (24) is adapted to fit the limit groove (14); When the corresponding first connecting tube (7) and the second connecting tube (19) are connected: the sliding sleeve (8) is pushed so that the sliding sleeve (8) is close to the corresponding second connecting tube (19), so that the limiting plate (24) rotates 90 degrees, the limiting plate (24) drives the closing plate (20) to rotate through the spline shaft sleeve (21) and the spline rod (22), the second connecting tube (19) is opened, and the limiting plate (24) is snapped into the limiting groove (14), thereby realizing the connection between the first connecting tube (7) and the second connecting tube (19); When the corresponding first connecting tube (7) and the second connecting tube (19) are disassembled: the limiting plate (24) is disengaged from the limiting groove (14), the sliding sleeve (8) moves in a direction close to the corresponding liquid storage box (2), the limiting plate (24) is loosened, the limiting plate (24) moves in a direction close to the second connecting tube (19), and the closing plate (20) rotates to block the second connecting tube (19).

2. A high-pressure combined multi-stage pump according to claim 1, characterized in that: A first inclined surface (12) is formed at one end of the fixed block (11) away from the corresponding liquid storage box (2). When the limiting plate (24) slides along the through groove (13), the limiting plate (24) gradually moves away from the second connecting pipe (19) under the guidance of the first inclined surface (12).

3. A high-pressure combined multi-stage pump according to claim 2, characterized in that: A second guide curved surface (18) is provided on a side wall of the limiting groove (14) close to the through groove (13); a fixing plate (15) is fixedly provided on one end of the fixing block (11) close to the corresponding liquid storage box (2); a second inclined surface (16) and a first guide curved surface (17) are provided on the fixing plate (15); initially, the closing plate (20) blocks the second connecting pipe (19), and the sliding sleeve (8) is pushed leftward so that the limiting plate (24) moves along the through groove (13) close to the fixing plate (19); When the limiting plate (24) slides in the direction of the closing plate (20), when one end of the limiting plate (24) contacts the second inclined surface (16), the limiting plate (24) rotates under the guiding action of the second inclined surface (16), and after the limiting plate (24) contacts and cooperates with the first guiding curved surface (17) and the second guiding curved surface (18), the limiting plate (24) moves along the first guiding curved surface (17) and the second guiding curved surface (18) in a direction close to the closing plate (20) and is inserted into the limiting groove (14); The limiting plate (24) drives the closing plate (20) to rotate via the spline rod (22), thereby opening the second connecting pipe (19).

4. A high-pressure combined multi-stage pump according to claim 1, characterized in that: Two slideways (9) are symmetrically provided on the first connecting pipe (7), and two protrusions are fixedly connected to the end of the sliding sleeve (8), the two protrusions correspond to the two slideways (9) one by one, and the protrusions are slidably arranged in the corresponding slideways (9); a spring (10) is arranged in each slideway (9), one end of the spring (10) is fixedly connected to the corresponding protrusion, and the other end of the spring (10) is fixedly connected to an end wall of the slideway (9).

5. A high-pressure combined multi-stage pump according to claim 1, characterized in that: A handle (25) is provided at the upper end of the limiting plate (24).

6. A high-pressure combined multi-stage pump according to claim 1, characterized in that: The closing plate (20) is provided with a receiving groove which is in communication with the spline shaft sleeve (21). A tension spring (23) is arranged in the receiving groove. One end of the tension spring (23) is fixedly connected to the spline rod (22), and the other end of the tension spring (23) is fixedly connected to the bottom wall of the receiving groove.

7. A high-pressure combined multi-stage pump according to claim 1, characterized in that: A sealing ring (4) is provided on the liquid outlet pipe (3).

8. A high pressure combined multi-stage pump according to claim 1, characterized in that: A liquid filling port is provided at the top of each liquid storage box (2), and a sealing cover (6) is provided at the liquid filling port.

9. A high-pressure combined multi-stage pump according to claim 1, characterized in that: The output end of the air pump (27) is provided with a second connecting pipe (19), and the second connecting pipe (19) is connected to the first connecting pipe (7) at the head end via a connecting assembly.

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