Cylinder body sealing structure of ultrahigh-pressure hydraulic pump

Abstract

The utility model relates to the technical field of hydraulic pumps, and discloses an ultrahigh pressure hydraulic pump cylinder body sealing structure which comprises a machine frame base and a pump body fixedly installed on the left side of the upper end face of the machine frame base, and a servo motor is fixedly installed on the right side of the upper end face of the machine frame base. The output shaft end of the servo motor is fixedly connected with a pump blade output shaft in the pump body through a coupler, a pump cover is further installed on the upper end face of the pump body, a protection mechanism used for sealing the joint of the pump body is arranged on the inner side wall of the pump cover, and a protection shell is further fixedly installed on the right side of the upper end face of the rack base. An auxiliary mechanism is arranged on the upper portion of the side wall of the protective shell. Through the arrangement of the protection mechanism, the sealing between the pump body and the pump cover can be ensured, and meanwhile, the auxiliary mechanism is additionally arranged to lubricate the shaft part of the coupler, so that the phenomena of air leakage and liquid leakage caused by expansion of the joint of the pump body due to axial deviation are effectively reduced, and the sealing performance of the whole equipment is further improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic pump technology, specifically to a sealing structure for an ultra-high pressure hydraulic pump cylinder. Background Technology

[0002] With social development and continuous technological progress, hydraulic transmission technology has become increasingly well-known, and its application has expanded from traditional heavy industry to light industry. Compared with traditional mechanical transmission, hydraulic transmission has the following advantages: high power-to-weight ratio, flexible connection, wide transmission range, flexible arrangement of hydraulic components, good impact resistance, and convenient control. Currently, it is mainly used in the engineering field. With the rapid development of industries such as aerospace, rail transportation, river and sea vessels, offshore oil, and engineering machinery, my country's demand for high-end hydraulic components and systems is increasing. However, as the power unit of hydraulic systems, hydraulic pumps, which are widely used in various systems, still heavily rely on imports and cannot meet the needs of large-scale main equipment development. In particular, ultra-high pressure hydraulic pumps still face the problem of dependence on foreign technology, and there is an urgent need to conduct in-depth research to improve design, manufacturing technology, and product reliability, and promote their localization. In addition, in large forging equipment, marine machinery, and full-face tunneling machinery, hydraulic pumps are required to provide a large amount of high-pressure oil to ensure the normal operation of the equipment. Traditional single hydraulic pumps are difficult to achieve high-pressure, high-flow output. For the equipment to operate normally, a prime mover is needed to drive multiple hydraulic pumps simultaneously, utilizing auxiliary components such as accumulators and boosters to achieve high-pressure, high-flow output. Therefore, there is an urgent need to develop an ultra-high-pressure hydraulic pump with high volumetric efficiency and large flow rate.

[0003] In existing technologies, ultra-high pressure hydraulic pump bodies generally use copper gaskets for sealing. During high-pressure pump operation, the piston reciprocates under the high-speed rotation of the crankshaft, resulting in significant vibration. This vibration can easily cause the cylinder body to disengage and fail to hold the copper gasket in place, leading to ineffective sealing. The disadvantages include: reduced equipment operating rate; hydraulic oil leakage and waste; and high maintenance costs. Therefore, there is an urgent need for a new sealing structure for ultra-high pressure hydraulic pump cylinder bodies. Utility Model Content

[0004] (1) Technical problems solved

[0005] The purpose of this invention is to provide a sealing structure for an ultra-high pressure hydraulic pump cylinder to solve the problem of poor sealing performance mentioned in the background art.

[0006] (2) Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a sealing structure for an ultra-high pressure hydraulic pump cylinder, comprising a frame base and a pump body fixedly installed on the left side of the upper end face of the frame base. A servo motor is fixedly installed on the right side of the upper end face of the frame base. The output shaft end of the servo motor is fixedly connected to the pump blade output shaft inside the pump body via a coupling. A pump cover is also installed on the upper end face of the pump body. A protective mechanism for sealing the pump body interface is provided on the inner side wall of the pump cover. A protective shell is also fixedly installed on the right side of the upper end face of the frame base. An auxiliary mechanism is provided on the upper part of the side wall of the protective shell.

[0008] Preferably, the protective mechanism includes a sealing stud rotatably mounted on the lower side wall of the pump body, and a sealing nut threaded onto the side wall of the sealing stud. The sealing nut is located on the upper end face of the pump cover, and several sets of the sealing stud and sealing nut are provided on the pump body and the pump cover.

[0009] Preferably, a sealing gasket is fitted between the pump body and the inner wall of the pump cover, and the sealing gasket is made of nitrile rubber.

[0010] Preferably, a liquid storage box is fixedly installed on the upper end face of the protective shell, the coupling is disposed in the inner cavity of the protective shell, and a mixing mechanism is also disposed in the inner cavity of the liquid storage box.

[0011] Preferably, the auxiliary mechanism includes an adsorption sponge seat fixedly installed in the inner cavity of the protective shell, and a sealing plate slidably installed at the bottom of the inner cavity of the liquid storage box. Helium gas is filled between the sealing plate and the liquid storage box. A spiral rod is rotatably installed on the upper end face of the sealing plate. A top plate is threadedly installed on the side wall of the spiral rod. A conduit is fixedly installed on the left and right side walls of the liquid storage box. The input shaft of a coupling is rotatably installed in the inner cavity of the adsorption sponge seat. An opening is provided at the lower part of the adsorption sponge seat. The top plate is fixedly installed in the inner cavity of the liquid storage box.

[0012] Preferably, the helix angle of the spiral rod is greater than the equivalent friction angle of the top plate. The spiral rod is hollow, and an inlet and an outlet are respectively provided on the upper and lower sides of the side wall of the spiral rod. A one-way valve is provided at the inlet, leading to the inner cavity of the spiral rod, and a one-way valve is provided at the outlet, leading to the outside. The spiral rod and the top plate are sealed. The other end of the conduit passes through the dust cover and is connected to the adsorption sponge seat.

[0013] Preferably, the mixing mechanism includes a rotating disk fixedly installed on the top of the spiral rod, and a connecting seat rotatably installed in the inner cavity of the rotating disk. A mixing plate is slidably installed on both sides of the upper end face of the top plate. A telescopic rod is rotatably installed in the inner cavity of the mixing plate. The other end of the telescopic rod is rotatably connected to the connecting seat. A plurality of through holes are provided on the mixing plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] When the hydraulic pump is working, the servo motor drives the coupling to rotate continuously. The temperature of the adsorption sponge seat that is in contact with the coupling rises continuously and is transferred to the protective shell. At this time, the helium gas in the reservoir will continue to heat up, and the gas energy will increase. The helium gas will expand and squeeze the sealing plate to move upwards in the reservoir. At this time, the pressure of the lubricating oil in the sealing plate and the top plate will continue to increase, allowing the lubricating oil to continuously enter the adsorption sponge seat through the conduit and continuously penetrate the inner cavity of the adsorption sponge seat. The lubricating oil will be distributed to every part of the adsorption sponge seat, and finally, it can be coated on the surface wall of the coupling input shaft for a relatively long time, lubricating the connection parts. This effectively reduces the air and liquid leakage caused by the expansion of the pump body interface due to axial misalignment, and further improves the sealing performance of the entire equipment. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the overall structure of an ultra-high pressure hydraulic pump cylinder sealing structure according to the present invention;

[0017] Figure 2 This is a rear view schematic diagram of the sealing structure of an ultra-high pressure hydraulic pump cylinder according to the present invention;

[0018] Figure 3 This is a partial schematic diagram illustrating the sealing structure of an ultra-high pressure hydraulic pump cylinder according to this utility model.

[0019] Figure 4 This is a cross-sectional view of the protective shell of the cylinder sealing structure of an ultra-high pressure hydraulic pump according to this utility model.

[0020] In the diagram: 1. Frame base; 11. Protective shell; 12. Liquid storage box; 2. Pump body; 3. Servo motor; 4. Coupling; 5. Pump cover; 6. Protective mechanism; 61. Sealing stud; 62. Sealing nut; 63. Sealing washer; 7. Auxiliary mechanism; 71. Adsorption sponge seat; 72. Sealing plate; 73. Screw rod; 731. Liquid inlet; 732. Liquid outlet; 74. Top plate; 75. Guide tube; 8. Mixing mechanism; 81. Rotary disc; 82. Connecting seat; 83. Mixing plate; 84. Telescopic rod. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-Figure 4 This utility model provides a technical solution for the sealing structure of an ultra-high pressure hydraulic pump cylinder:

[0023] A sealing structure for an ultra-high pressure hydraulic pump cylinder includes a frame base 1 and a pump body 2 fixedly installed on the left side of the upper end face of the frame base 1. A servo motor 3 is fixedly installed on the right side of the upper end face of the frame base 1. The output shaft end of the servo motor 3 is fixedly connected to the pump blade output shaft inside the pump body 2 through a coupling 4. A pump cover 5 is also installed on the upper end face of the pump body 2. A protective mechanism 6 for sealing the interface of the pump body 2 is provided on the inner side wall of the pump cover 5. A protective shell 11 is also fixedly installed on the right side of the upper end face of the frame base 1. An auxiliary mechanism 7 is provided on the upper part of the side wall of the protective shell 11. A liquid storage box 12 is fixedly installed on the upper end face of the protective shell 11. The coupling 4 is located in the inner cavity of the protective shell 11. A mixing mechanism 8 is also provided in the inner cavity of the liquid storage box 12.

[0024] Furthermore, the protective mechanism 6 includes a sealing stud 61 rotatably mounted on the lower side wall of the pump body 2, and a sealing nut 62 threadedly mounted on the side wall of the sealing stud 61. The sealing nut 62 is located on the upper end face of the pump cover 5. Several sets of sealing studs 61 and sealing nuts 62 are provided on the pump body 2 and the pump cover 5. A sealing washer 63 is engaged with the inner side wall of the pump body 2 and the pump cover 5. The sealing washer 63 is made of nitrile rubber.

[0025] The sealing gasket 63 ensures good sealing performance between the pump body 2 and the pump cover 5.

[0026] Furthermore, the auxiliary mechanism 7 includes an adsorption sponge seat 71 fixedly installed inside the protective shell 11, and a sealing plate 72 slidably installed at the bottom of the inner cavity of the liquid storage box 4. Helium gas is filled between the sealing plate 72 and the liquid storage box 4. A spiral rod 73 is rotatably installed on the upper end face of the sealing plate 72. A top plate 74 is threaded onto the side wall of the spiral rod 73. Conduits 75 are fixedly installed on the left and right side walls of the liquid storage box 4. The input shaft of the coupling 6 is rotatably installed inside the adsorption sponge seat 71. An opening is provided at the lower part of the adsorption sponge seat 71. The top plate 74 is fixedly installed in the inner cavity of the liquid storage box 4. The thread helix angle of the spiral rod 73 is greater than the equivalent friction angle of the top plate 74. The spiral rod 73 is hollow, and the upper and lower sides of the side wall of the spiral rod 73 are respectively provided with an inlet 731 and an outlet 732. A one-way valve is provided at the inlet 731 to the inner cavity of the spiral rod 73, and a one-way valve is provided at the outlet 732 to the outside. The spiral rod 73 and the top plate 74 are sealed. The other end of the conduit 75 passes through the dust cover 3 and is connected to the adsorption sponge seat 71.

[0027] It should be noted that when the hydraulic pump is working, the servo motor 3 will drive the coupling 4 to rotate continuously. The temperature of the adsorption sponge seat 71, which is in contact with the coupling 4, will continuously rise and be transmitted to the protective shell 12. At this time, the helium gas in the liquid storage box 4 will continuously heat up, the gas energy will increase, the helium gas will expand and squeeze the sealing plate 72 to move to the upper part of the liquid storage box 4. At this time, the pressure of the lubricating oil in the sealing plate 72 and the top plate 74 will continuously increase, so that the lubricating oil can continuously enter the adsorption sponge seat 71 through the conduit 75 and continuously immerse itself in the inner cavity of the adsorption sponge seat 71. The lubricating oil will be distributed to every part of the adsorption sponge seat 71, and finally can be coated on the surface wall of the input shaft of the coupling 6 for a relatively long time, lubricating the connection part, effectively reducing the air and liquid leakage caused by the expansion of the pump body interface due to axial displacement, and further improving the sealing performance of the entire equipment.

[0028] Furthermore, the mixing mechanism 8 includes a rotating disk 81 fixedly installed on the top of the screw rod 73, and a connecting seat 82 rotatably installed in the inner cavity of the rotating disk 81. A mixing plate 83 is slidably installed on both sides of the upper end face of the top plate 74. A telescopic rod 84 is rotatably installed in the inner cavity of the mixing plate 83. The other end of the telescopic rod 84 is rotatably connected to the connecting seat 82. Several through holes are provided on the mixing plate 83.

[0029] It should be noted that because the helix angle of the screw rod 73 is greater than the equivalent friction angle of the top plate 74, the screw rod 73 will rotate and rise when the sealing plate 72 moves up or down. When the lubricating oil on the top plate 74 enters the inner cavity of the screw rod 73, it enters in a cyclone manner, which can a certain extent stir the lubricating oil on the top plate 74. At the same time, as the rotating disk 81 rises and falls, the bottom surface of the mixing plate 83 is always in contact with the top plate 74. Thus, the mixing plate 83 will slide back and forth on the top plate 74. With several through holes provided on the mixing plate 83, the lubricating oil can be further thoroughly mixed, avoiding the deposition of solutes in the reservoir box 4 due to prolonged retention of lubricating oil, and ensuring a good service life of the lubricating oil.

[0030] Working principle:

[0031] When the hydraulic pump is working, the servo motor 3 will drive the coupling 4 to rotate continuously. The temperature of the adsorption sponge seat 71 that is in contact with the coupling 4 will rise continuously and be transmitted to the protective shell 12. At this time, the helium in the liquid storage box 4 will continue to heat up, the gas energy will increase, the helium will expand and squeeze the sealing plate 72 to move to the upper part of the liquid storage box 4. At this time, the pressure of the lubricating oil in the sealing plate 72 and the top plate 74 will continue to increase, so that the lubricating oil can continuously enter the adsorption sponge seat 71 through the conduit 75 and continuously penetrate into the inner cavity of the adsorption sponge seat 71. The lubricating oil will be distributed to every part of the adsorption sponge seat 71, and finally can be coated on the surface wall of the input shaft of the coupling 6 for a relatively long time, lubricating the connection part, effectively reducing the air and liquid leakage caused by the expansion of the pump body interface due to axial offset, and further improving the sealing performance of the entire equipment.

[0032] After the hydraulic pump stops working for a period of time, the temperature of the helium gas in the lower part of the inner cavity of the reservoir box 4 gradually decreases. At this time, the capacity between the sealing plate 72 and the top plate 74 increases, and the internal lubricating oil pressure is low. Thus, the lubricating oil on the top plate 74 can enter the screw rod 73 through the inlet 731 and then be discharged from the outlet 732 between the sealing plate 72 and the top plate 74 of the reservoir box 4, thereby replenishing the lubricating oil and enabling the entire hydraulic pump to continue to be used when it is used again.

[0033] Because the helix angle of the screw rod 73 is greater than the equivalent friction angle of the top plate 74, the screw rod 73 will rotate and rise when the sealing plate 72 moves up or down. When the lubricating oil on the top plate 74 enters the inner cavity of the screw rod 73, it enters in a cyclone-like manner, which can agitate the lubricating oil on the top plate 74 to a certain extent. At the same time, as the rotating disk 81 rises and falls, the bottom surface of the mixing plate 83 is always in contact with the top plate 74, so the mixing plate 83 will slide back and forth on the top plate 74. With several through holes provided on the mixing plate 83, the lubricating oil can be further thoroughly mixed, avoiding the deposition of solutes in the reservoir box 4 due to prolonged retention of lubricating oil, thus ensuring a good service life of the lubricating oil.

[0034] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A sealing structure for an ultra-high pressure hydraulic pump cylinder, comprising a frame base (1) and a pump body (2) fixedly mounted on the left side of the upper end face of the frame base (1), wherein a servo motor (3) is fixedly mounted on the right side of the upper end face of the frame base (1), characterized in that: The output shaft of the servo motor (3) is fixedly connected to the pump blade output shaft inside the pump body (2) via a coupling (4). A pump cover (5) is also installed on the upper end face of the pump body (2). A protective mechanism (6) for sealing the interface of the pump body (2) is provided on the inner side wall of the pump cover (5). A protective shell (11) is also fixedly installed on the right side of the upper end face of the frame base (1). An auxiliary mechanism (7) is provided on the upper side wall of the protective shell (11).

2. The sealing structure of an ultra-high pressure hydraulic pump cylinder according to claim 1, characterized in that: The protective mechanism (6) includes a sealing stud (61) rotatably mounted on the lower side wall of the pump body (2) and a sealing nut (62) threadedly mounted on the side wall of the sealing stud (61). The sealing nut (62) is located on the upper end face of the pump cover (5). Several sets of the sealing stud (61) and sealing nut (62) are provided on the pump body (2) and the pump cover (5).

3. The ultra-high pressure hydraulic pump cylinder sealing structure according to claim 1, characterized in that: A sealing gasket (63) is fitted into the inner wall of the pump body (2) and the pump cover (5), and the sealing gasket (63) is made of nitrile rubber.

4. The sealing structure of an ultra-high pressure hydraulic pump cylinder according to claim 1, characterized in that: A liquid storage box (12) is fixedly installed on the upper end face of the protective shell (11), the coupling (4) is set in the inner cavity of the protective shell (11), and a mixing mechanism (8) is also provided in the inner cavity of the liquid storage box (12).

5. The ultra-high pressure hydraulic pump cylinder sealing structure according to claim 4, characterized in that: The auxiliary mechanism (7) includes an adsorption sponge seat (71) fixedly installed in the inner cavity of the protective shell (11) and a sealing plate (72) slidably installed at the bottom of the inner cavity of the liquid storage box (4). The space between the sealing plate (72) and the liquid storage box (4) is filled with helium. A spiral rod (73) is rotatably installed on the upper end face of the sealing plate (72). A top plate (74) is threaded on the side wall of the spiral rod (73). A conduit (75) is fixedly installed on the left and right side walls of the liquid storage box (4). The input shaft of the coupling (6) is rotatably installed in the inner cavity of the adsorption sponge seat (71). An opening is provided at the lower part of the adsorption sponge seat (71). The top plate (74) is fixedly installed in the inner cavity of the liquid storage box (4).

6. The sealing structure of an ultra-high pressure hydraulic pump cylinder according to claim 5, characterized in that: The helix angle of the spiral rod (73) is greater than the equivalent friction angle of the top plate (74). The spiral rod (73) is hollow, and the upper and lower sides of the side wall of the spiral rod (73) are respectively provided with an inlet (731) and an outlet (732). A one-way valve is provided at the inlet (731) to the inner cavity of the spiral rod (73), and a one-way valve is provided at the outlet (732) to the outside. The spiral rod (73) and the top plate (74) are sealed. The other end of the conduit (75) passes through the dust cover (3) and is connected to the adsorption sponge seat (71).

7. The ultra-high pressure hydraulic pump cylinder sealing structure according to claim 4, characterized in that: The mixing mechanism (8) includes a rotating disk (81) fixedly installed on the top of the screw rod (73) and a connecting seat (82) rotatably installed in the inner cavity of the rotating disk (81). A mixing plate (83) is slidably installed on both sides of the upper end face of the top plate (74). A telescopic rod (84) is rotatably installed in the inner cavity of the mixing plate (83). The other end of the telescopic rod (84) is rotatably connected to the connecting seat (82). A plurality of through holes are provided on the mixing plate (83).

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