A pressure differential type automatic oil pressing device

Abstract

The present invention relates to a pressure differential automatic oil pressing device, belonging to the technical field of hydraulic control, which comprises an oil storage tank, a piston part slidingly arranged in the oil storage tank, and a compression spring for abutting against the piston part, wherein the piston part divides the internal cavity of the oil storage tank into an oil storage cavity and an oil-free cavity, wherein the oil-free cavity is located above the oil storage cavity, and the compression spring is located in the oil-free cavity, and a first sealing ring for abutting against the inner wall of the oil storage tank is arranged on the circumferential outer wall of the piston part, and an overflow hole is opened on the side wall of the oil storage tank. The present application has the effect of realizing the automatic control discharge of the oil agent in the oil storage pipe while making it difficult for the outside air to enter the oil storage pipe.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic control, and in particular to a pressure differential type automatic oil pressing device. Background Art

[0002] At present, the oil injection pump is used to add lubricating oil to mechanical bearings and other mechanical parts. The oil injection pump often comes with an oil storage tank. An oil inlet pipe is installed at the bottom of the oil storage tank. The oil inlet pipe is used to connect to the vacuum oil injection machine. An overflow hole is opened on the side wall of the oil storage tank. A switch valve is installed in the overflow hole, and a liquid level gauge is set in the oil storage tank.

[0003] When the oil injection pump is working, oil is added to the oil tank through the vacuum oil injection machine, and the switch valve is opened. When the oil level in the oil tank reaches the height of the overflow hole, the oil flows out of the overflow valve, thereby adding lubricating oil to the mechanical parts. When the oil in the oil tank is added, the oil in the oil tank continues to be discharged through the switch valve. When the liquid level component detects that the oil in the oil tank is lower than the height of the overflow hole, the switch valve is closed. Among them, the switch valve is set to prevent the outside air from entering the oil tank, so that the oil in the oil tank is not easy to react with the gas in the air.

[0004] With respect to the above-mentioned related technologies, the inventor believes that in the above-mentioned technical scheme, when controlling the discharge of the oil in the oil storage tank, the liquid level meter and the switch valve need to work together. Now a mechanical structure is needed to replace the electronic control method to achieve the control of the oil discharge while maintaining a vacuum state in the oil storage tank to cooperate with the use of a vacuum oiling machine. Summary of the invention

[0005] In order to prevent external air from entering the oil storage pipe and realize automatic controlled discharge of oil in the oil storage pipe, the present application provides a pressure differential type automatic oil pressing device.

[0006] The present application provides a pressure differential type automatic oil pressing device adopts the following technical solution:

[0007] A pressure differential automatic oil pressure device comprises an oil storage tank, a piston portion slidably arranged in the oil storage tank, and a compression spring for abutting against the piston portion, wherein the piston portion divides the internal cavity of the oil storage tank into an oil storage cavity and an oil-free cavity, the oil-free cavity is located above the oil storage cavity, the compression spring is located in the oil-free cavity, a first sealing ring for abutting against the inner side wall of the oil storage tank is arranged on the circumferential outer side wall of the piston portion, and an overflow hole is opened on the side wall of the oil storage tank.

[0008] By adopting the above technical solution, when the oil is added to the oil storage chamber by the vacuum oil filling machine, the oil level in the oil storage chamber rises and exceeds the height of the overflow hole, and the oil flows out of the overflow hole. At this time, the extrusion spring contracts. When the vacuum oil filling machine finishes filling the oil, the extrusion spring squeezes the piston part, causing the piston part to slide downward. When the first sealing ring drops to the height of the overflow hole, the first sealing ring blocks the overflow hole, thereby stopping the oil from overflowing. In the process, since the oil itself occupies the overflow hole and the first sealing ring blocks the overflow hole, it is not easy for outside air to enter the oil storage tank.

[0009] At the same time, when the oil storage tank is tilted to a certain extent due to external force, the extrusion spring squeezes the piston plate so that the plane where the oil level in the oil storage chamber is parallel to the plane of the top end cover, and through the action of the first sealing ring, the oil storage tank is tilted to a certain extent, and the oil in the oil storage chamber is not easy to flow out from the overflow hole.

[0010] Optionally, a second sealing ring is provided on the piston portion for abutting against the inner wall of the oil storage tank, and the second sealing ring is located above the first sealing ring.

[0011] By adopting the above technical solution, when the outside air enters the oil storage tank due to reasons such as equipment aging, the second sealing ring prevents the air from entering the oil-free chamber. At this time, the air stays between the first sealing ring and the second sealing ring. If the second sealing ring is not provided, when the air enters the oil-free chamber, there is a risk of air entering the oil storage chamber from the oil-free chamber due to the continuous sliding of the piston. The risk of air entering the oil storage chamber is reduced by providing the second sealing ring. At the same time, due to the action of the extrusion spring, the piston plate continuously squeezes the oil in the oil storage chamber, so that the oil in the oil storage chamber fills the entire oil storage chamber, further reducing the risk of air entering the oil storage chamber.

[0012] Optionally, a first elastic gap is formed on the first sealing ring, and a first sealing portion is provided on the first sealing ring for abutting against the inner wall of the oil storage tank, and the first sealing portion has elastic potential energy for abutting against the inner wall of the oil storage tank.

[0013] By adopting the above technical solution and arranging the first sealing part, the sealing performance between the sealing ring and the oil storage pipe is improved, so that the oil storage pipe can be placed horizontally or tilted, and the oil storage tank can be used.

[0014] Optionally, the piston part includes a piston plate abutting the extrusion spring and a mounting cylinder arranged above the piston plate, the mounting cylinder and the piston plate form a mounting cavity for the end of the extrusion spring to be embedded, the first sealing ring and the second sealing ring are both arranged on the mounting cylinder, and the radius of the extrusion spring gradually decreases from top to bottom.

[0015] By adopting the above technical solution, the installation cavity is provided so that the extrusion spring part can be embedded in the piston part, and the extrusion spring is positioned while improving the space utilization rate in the oil-free cavity. At the same time, the radius of the extrusion spring gradually decreases from top to bottom, so that the extrusion spring is not easy to interfere with the top side wall of the installation cylinder during the expansion and contraction process, so that the extrusion spring can be better expanded and contracted.

[0016] Optionally, a first filling piece is disposed in the first elastic gap of the first sealing ring, and the first filling piece is used to press the first sealing portion against the inner wall of the oil storage tank.

[0017] By adopting the above technical solution and providing the first filling piece, the first filling piece is made to squeeze the first sealing portion, so that the first sealing portion can better press against the inner wall of the oil storage tank.

[0018] Optionally, the mounting tube has a protrusion, the upper side wall of the protrusion abuts against the lower side wall of the first sealing ring, the circumferential outer side wall of the piston plate and the protrusion are jointly provided with a mounting groove, the mounting groove is provided with a lifting piece, and the extrusion spring is used to squeeze the lifting piece away from the inner side wall of the oil storage tank.

[0019] By adopting the above technical solution, due to the squeezing of the squeezing spring, the side of the lifting member away from the inner wall of the oil storage tank tilts downward to a certain extent. At this time, the side of the lifting member close to the inner wall of the oil storage tank tilts upward to a certain extent, thereby causing the first sealing ring to move upward, thereby enabling the first filling member to better squeeze the first sealing part, thereby improving the sealing between the first sealing part and the oil storage tank.

[0020] Optionally, an inner wall of the mounting tube is provided with a mounting groove, the mounting groove is located between the first sealing ring and the second sealing ring, the mounting groove has a top groove wall and a bottom groove wall, and the mounting tube is provided with an extrusion piece in the mounting groove for extruding the top groove wall and the bottom groove wall.

[0021] By adopting the above technical solution, an extrusion piece is arranged above the first sealing ring, so that the extrusion piece can exert a downward force on the first filling piece, so that the first filling piece can better squeeze the first sealing part, thereby improving the sealing between the first sealing part and the oil storage tank. At the same time, through the force of the extrusion piece on the installation tube above the extrusion piece, the part of the installation tube above the extrusion piece can better press against the inner wall of the oil storage tank, so that the second sealing ring can better press against the inner wall of the oil storage tank.

[0022] Optionally, the top groove wall is arranged to be inclined upward from a side close to the inner wall of the oil storage tank to a side away from the inner wall of the oil storage tank.

[0023] By adopting the above technical solution, the lifting member applies a vertical upward force to the part of the mounting cylinder located above the extrusion member, and at the same time applies a horizontal force thereto, and the horizontal force is directed toward the inner wall of the oil storage tank, so that the second sealing ring can better press against the inner wall of the oil storage tank.

[0024] Optionally, a second elastic gap is formed on the second sealing ring, the second sealing ring has a second sealing portion abutting against the inner wall of the oil storage tank, and a second filling piece is arranged in the second elastic gap of the second sealing ring;

[0025] The top of the extrusion member is tightly pressed against the top groove wall, a sliding cavity is provided on the top groove wall, a sliding member is provided in the sliding cavity of the mounting tube, one end of the sliding member is pressed against the bottom of the second sealing ring, and the other end of the sliding member is pressed against the top of the extrusion member.

[0026] By adopting the above technical solution, the second filling member can be better embedded in the second elastic gap by squeezing the bottom of the second sealing ring by the sliding member, thereby squeezing the second sealing part so that the second sealing part can better press against the inner wall of the oil storage tank.

[0027] Optionally, a connecting cavity is opened on the bottom groove wall, and the installation tube is provided with a connecting piece in the connecting cavity, the top of the connecting piece abuts against the bottom of the extrusion piece, and the bottom of the connecting piece abuts against the top of the first filling piece.

[0028] By adopting the above technical solution and providing a connecting piece, the connecting piece is made to squeeze the first filling piece so that the first filling piece has a tendency to move downward, thereby tending the first sealing part to press against the inner wall of the oil storage tank.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. By setting the first sealing ring, it is difficult for the outside air to enter the oil storage chamber. At the same time, through the extrusion spring, after the oil filling is completed, the piston part can automatically move downward under the action of the extrusion spring and squeeze the oil in the oil storage chamber;

[0031] 2. Through the extrusion piece and the sliding piece, the second sealing part can better press against the inner wall of the oil storage tank;

[0032] 3. By providing a lifting piece, the first sealing part can better press against the inner wall of the oil storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the pressure differential type automatic oil pressing device in Example 1.

[0034] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0035] Figure 3 It is a schematic diagram of the partial structure of the oil storage tank and the piston part in Example 2.

[0036] Figure 4 yes Figure 3 Enlarged view of part B in the middle.

[0037] Figure 5 It is an exploded schematic diagram of the piston plate and the lifting member in Example 2.

[0038] Explanation of the reference numerals: 1. oil storage tank; 11. overflow hole; 12. oil inlet pipe; 13. oil storage chamber; 14. oil-free chamber; 15. top end cover; 151. mounting ring; 16. locking screw; 2. piston part; 21. mounting chamber; 3. extrusion spring; 4. piston plate; 41. first placement groove; 42. first abutment strip; 5. mounting cylinder; 51. first sealing groove; 511. first sealing ring; 512. first elastic gap; 513. first sealing part; 514. first filling piece; 5141. first filling part; 5142. first Abutment portion; 52, second sealing groove; 521, second sealing ring; 522, second elastic gap; 523, second sealing portion; 524, second filling piece; 53, mounting groove; 531, top groove wall; 532, bottom groove wall; 54, extrusion piece; 541, triangular piece; 5411, positioning ring groove; 55, connecting cavity; 551, connecting piece; 56, sliding cavity; 561, sliding piece; 57, protrusion; 571, second placement groove; 572, second abutment strip; 573, extension ring; 58, lifting groove; 581, lifting piece. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-5 This application is described in further detail.

[0040] Embodiment 1:

[0041] Reference Figure 1 and Figure 2 The differential pressure automatic oil pressing device comprises an oil storage tank 1, a piston part 2 slidably arranged in the oil storage tank 1, and an extrusion spring 3. An overflow hole 11 is provided on the side wall of the oil storage tank 1, and an oil inlet pipe 12 is provided at the bottom of the oil storage tank 1, and the oil inlet pipe 12 is used to connect with a vacuum oil injection machine. The piston part 2 divides the cavity in the oil storage tank 1 into an oil storage chamber 13 and an oil-free chamber 14, the oil storage chamber 13 is located below the oil-free chamber 14, and the extrusion spring 3 is located in the oil-free chamber 14, and the bottom end of the extrusion spring 3 is used to abut against the piston part 2. A first sealing ring 511 abutting against the inner wall of the oil storage tank 1 is provided on the circumferential outer wall of the piston part 2.

[0042] Reference Figure 1 and Figure 2 When the differential pressure automatic oil pressurizing device is discharging oil, oil is added to the oil storage chamber 13 through the vacuum oil injection machine. At this time, the piston part 2 moves upward, and the volume of the oil-free chamber 14 decreases. When the height of the oil in the oil storage chamber 13 is higher than the height of the overflow hole 11, and the first sealing ring 511 slides to the top of the overflow hole 11, the oil flows out of the oil storage chamber 13. When the vacuum oil injection machine stops injecting oil, under the squeezing effect of the squeezing spring 3 and the gravity of the oil itself, the piston part 2, the oil level and the first sealing ring 511 drop synchronously. When the first sealing ring 511 drops to the height of the overflow hole 11, the first sealing ring 511 blocks the overflow hole 11, and the oil stops flowing out.

[0043] Reference Figure 1 and Figure 2 In the process of oil agent flowing out from the overflow hole 11, the oil agent itself fills the overflow hole 11, making it difficult for air to enter the oil storage chamber 13 through the overflow hole 11; at the same time, when the oil agent does not flow out from the overflow hole 11, the first sealing ring 511 blocks the overflow hole 11, thereby making it difficult for external air to enter the oil storage chamber 13 through the overflow hole 11, thereby making it difficult for air to enter the oil storage chamber 13 when the pressure differential type automatic oil pressing device is in working and idle states. Among them, when the rate at which the vacuum oil injection machine adds oil into the oil storage chamber 13 increases, the oil level in the oil storage chamber 13 rises. At this time, the contraction amount of the extrusion spring 3 increases, and the pressure generated by the extrusion spring 3 on the piston part 2 increases. Under the extrusion action of the extrusion spring 3, the rate at which the oil flows out of the overflow hole 11 increases, and finally the rate at which the oil flows out of the overflow hole 11 is equal to the oil inlet rate in the oil inlet pipe 12, that is: when the oil injection rate of the vacuum oil injection machine is constant, the height of the first sealing ring 511 in the oil storage chamber 13 remains stable. When the oil injection is completed, the first sealing ring 511 slides to a height corresponding to the overflow hole 11 under the action of the extrusion spring 3.

[0044] Reference Figure 2 The piston part 2 includes a disc-shaped piston plate 4 and a mounting tube 5 integrally connected to the piston plate 4, and the mounting tube 5 is located above the piston plate 4. The mounting tube 5 is provided with a first sealing groove 51 in an annular shape for placing a first sealing ring 511. A first elastic gap 512 is provided on the upper end surface of the first sealing ring 511. In this embodiment, the longitudinal section of the first elastic gap 512 is preferably V-shaped. The first sealing ring 511 is provided with a first sealing portion 513 bent toward the inner side wall of the oil storage tank 1, and the first sealing portion 513 is in contact with the inner side wall of the oil storage tank 1 and has elastic potential energy to press against the inner side wall of the oil storage tank 1.

[0045] Reference Figure 2At the same time, a second sealing groove 52 arranged in an annular shape is provided on the circumferential outer wall of the mounting cylinder 5, and a second sealing ring 521 is placed in the second sealing groove 52, and the second sealing ring 521 is located above the first sealing ring 511. The shape of the second sealing ring 521 is the same as that of the second sealing ring 521, and a second elastic gap 522 arranged in a V shape is provided on the second sealing ring 521, and the second sealing ring 521 has a second sealing portion 523 abutting against the inner wall of the oil storage tank 1. In this embodiment, the piston part 2 is made of a flexible material, such as various colloids such as rubber, and the first sealing ring 511 and the second sealing ring 521 are also made of a flexible material, and in this embodiment, the first sealing ring 511 and the second sealing ring 521 are both made of fluororubber, which has good oil resistance, so as to improve the sealing performance of the differential pressure automatic oil pressure device.

[0046] Reference Figure 2 , when the equipment is aged due to long-term use, even if some air enters the oil storage tank 1 through the overflow hole 11, the air is not easy to flow upward into the oil-free chamber 14 due to the action of the second sealing ring 521. At the same time, due to the action of the extrusion spring 3, the piston plate 4 continues to compress the oil in the oil storage chamber 13. At this time, a certain oil pressure is generated in the oil storage chamber 13, that is, under the pressure of the extrusion spring 3, the oil fills the entire oil storage chamber 13, that is, there is no space in the oil storage chamber 13 for air to enter. At this time, the highest oil level in the oil storage chamber 13 is the height of the lower side wall of the first sealing part 513. Therefore, even due to reasons such as equipment aging, it is not easy for outside air to enter the oil storage chamber 13 and the oil-free chamber 14. At this time, the outside air will only stay between the first sealing ring 511 and the second sealing ring 521.

[0047] Reference Figure 1 , wherein the mounting cylinder 5 and the piston plate 4 form a mounting cavity 21 for the end of the extrusion spring 3 to be embedded. In this embodiment, the radius of the extrusion spring 3 gradually increases from top to bottom, so that during the expansion and contraction of the extrusion spring 3, the outer wall of the extrusion spring 3 is not easy to interfere with the upper wall of the mounting cylinder 5 and the inner wall of the mounting cylinder 5.

[0048] Reference Figure 1 The oil storage tank 1 has a top end cover 15, and the bottom of the top end cover 15 is integrally connected with a mounting ring 151 that abuts against the inner side wall of the oil storage tank 1. A locking screw 16 is provided on the outer side wall of the oil storage tank 1, and the locking screw 16 is threadedly connected with the mounting ring 151, so as to fix the top end cover 15 on the oil storage tank 1. Among them, an airtight core (not shown in the figure) is provided on the top end cover 15, so that the air in the oil-free cavity 14 can be extracted by the exhaust device in the initial state. Among them, one end of the extrusion spring 3 abuts against the top end cover 15, and the other end abuts against the piston plate 4, and the extrusion spring 3 is always in a compressed state.

[0049] Reference Figure 2 Furthermore, an annular mounting groove 53 is provided on the inner side wall of the mounting tube 5, and the mounting groove 53 is located between the first sealing groove 51 and the second sealing groove, and the mounting groove 53 is filled with an extrusion piece 54. The mounting groove 53 has a top groove wall 531 and a bottom groove wall 532, and the upper end surface of the extrusion piece 54 extrudes the top groove wall 531, so that the portion of the mounting tube 5 located above the extrusion piece 54 can better press against the inner side wall of the oil storage tank 1, that is, the portion of the mounting tube 5 located above the extrusion piece 54 is not easy to bend in the direction away from the inner side wall of the oil storage tank 1.

[0050] Reference Figure 2 , wherein the extrusion member 54 can be a rubber ring or other elastic ring, or a spring. In this embodiment, the material of the extrusion member 54 is preferably rubber, and the extrusion member 54 and the mounting tube 5 have an interference fit so that the extrusion member 54 can better abut against the top groove wall 531 and the bottom groove wall 532, thereby causing a certain degree of deformation of the mounting tube 5.

[0051] Embodiment 2:

[0052] Reference Figure 3 and Figure 4 , the first sealing ring 511 is provided with a first filling piece 514 in the first elastic gap 512. In this embodiment, the height of the first sealing ring 511 is slightly lower than the height of the first sealing groove 51, that is, there is a certain gap between the top of the first sealing ring 511 and the upper groove wall of the first sealing groove 51. The first filling piece 514 has a first filling portion 5141 embedded in the first elastic gap 512 and a first abutting portion 5142 located above the first filling portion 5141 and integrally connected to the first filling portion 5141. The longitudinal cross-section of the first filling portion 5141 is V-shaped, so that the outer side wall of the first filling portion 5141 can better fit the first sealing ring 511. The first abutting portion 5142 abuts against the upper groove wall of the first sealing groove 51. Among them, the first elastic gap 512 and the first filling piece 514 are both annular.

[0053] Reference Figure 4 Due to the extrusion effect of the extrusion member 54 on the bottom groove wall 532 of the installation groove 53, the first filling member 514 has a tendency to move downward. Since the longitudinal sections of the first filling portion 5141 and the first elastic gap 512 are both V-shaped, when the first filling member 514 has a tendency to move downward, the first filling member 514 has a tendency to press the first sealing portion 513 against the inner wall of the oil storage tank 1, thereby further improving the sealing between the first sealing portion 513 and the inner wall of the oil storage tank 1.

[0054] Reference Figure 3 and Figure 4Furthermore, a connecting cavity 55 communicating with the first sealing groove 51 is provided on the bottom groove wall 532 of the mounting groove 53, and a connecting piece 551 is provided in the connecting cavity 55 of the mounting tube 5. The connecting cavity 55 and the connecting piece 551 are both annularly arranged, and the top of the connecting piece 551 abuts against the bottom side wall of the extrusion piece 54, and the bottom of the connecting piece 551 abuts against the first abutting portion 5142 of the first filling piece 514, and the connecting piece 551 can slide to a certain extent in the connecting cavity 55.

[0055] Reference Figure 3 and Figure 4 By squeezing the connecting member 551 through the extrusion member 54, the connecting member 551 has a tendency to slide downward, so that the first filling member 514 can be better inserted into the first elastic gap 512 of the first sealing ring 511, and then the first sealing portion 513 can be well pressed against the inner wall of the oil storage tank 1.

[0056] Reference Figure 4 , which is different from the first embodiment, is that the top groove wall 531 of the installation groove 53 is inclined upward from the side close to the inner wall of the oil storage tank 1 to the side away from the inner wall of the oil storage tank 1, so that the extrusion piece 54 generates a vertical upward force on the part of the installation tube 5 located above the extrusion piece 54, and at the same time generates a force toward the inner wall of the oil storage tank 1 and in the horizontal direction on the part of the installation tube 5 located above the extrusion piece 54, so that the part of the installation tube 5 above the extrusion piece 54 can better fit the inner wall of the oil storage tank 1. Among them, the extrusion piece 54 is integrally connected with a triangular piece 541, and the longitudinal section of the triangular piece 541 is set in a triangular shape. The extrusion piece 54 abuts against the top groove wall 531 of the installation groove 53 through the triangular piece 541.

[0057] Reference Figure 4 The upper side wall of the second sealing ring 521 is also slightly lower than the upper side wall of the second sealing groove 52. The second sealing ring 521 is provided with a second filling piece 524 in the second elastic gap 522. The second filling piece 524 has the same shape as the first filling piece 514. The second filling piece 524 is used to press the second sealing portion 523 against the inner wall of the oil storage tank 1.

[0058] Reference Figure 4The top groove wall 531 of the installation groove 53 is provided with a sliding cavity 56 which is connected with the second sealing groove 52. The sliding cavity 56 is annular and vertically arranged. The installation cylinder 5 is provided with a sliding member 561 in the sliding cavity 56. The sliding member 561 is also annularly arranged. The bottom of the sliding member 561 abuts against the triangular member 541, and the top of the sliding member 561 abuts against the bottom of the second sealing ring 521. The length of the sliding member 561 in the vertical direction is slightly greater than the length of the sliding cavity 56 in the vertical direction, and because the second sealing ring 521 can produce a certain degree of deformation, the top of the sliding member 561 can be partially embedded in the bottom of the second sealing ring 521, so that the second sealing ring 521 produces a certain degree of deformation, and then under the extrusion of the sliding member 561, the second sealing ring 521 has a tendency to move upward, and at this time the second filling member 524 can be more deeply embedded in the second elastic gap 522, and the second filling member 524 squeezes the second sealing portion 523, so that the second sealing portion 523 can better press against the inner wall of the oil storage tank 1. Among them, a positioning ring groove 5411 is provided at the top of the triangular member 541 for the bottom of the sliding member 561 to be embedded, so that the sliding member 561 is not easy to slide on the triangular member 541.

[0059] Reference Figure 4 , which is different from the first embodiment, is that the radius of the extrusion spring 3 changes from bottom to top as follows: it is fixed first, then gradually decreases, and the position where the radius of the extrusion spring 3 begins to gradually decrease is located below the top cavity opening of the installation cavity 21, and during the expansion and contraction process of the extrusion spring 3, the position where the radius of the extrusion spring 3 begins to gradually decrease is always located below the top cavity opening of the installation cavity 21. Thus, the extrusion spring 3 can abut against the inner side wall of the installation tube 5 to press the installation tube 5 against the inner side wall of the oil storage tank 1. At the same time, during the expansion and contraction process of the extrusion spring 3, the extrusion spring 3 is not easy to interfere with the upper side wall of the installation tube 5.

[0060] Reference Figure 4 Since the installation tube 5 is provided with the first sealing groove 51, a protrusion 57 is formed on the installation tube 5, and the upper side wall of the protrusion 57 is the lower side groove wall of the first sealing groove 51. The protrusion 57 and the circumferential outer side wall of the piston plate 4 are provided with a lifting groove 58, and a lifting member 581 is arranged in the lifting groove 58. The bottom end of the compression spring acts on the side of the lifting member 581 away from the inner side wall of the oil storage tank 1, and the side of the lifting member 581 close to the inner side wall of the oil storage tank 1 acts on the first sealing ring 511 in the first sealing groove 51.

[0061] Reference Figure 4Since the piston plate 4 is supported by a flexible material, it can deform to a certain extent, and the extrusion spring 3 is always in a compressed state. The extrusion spring 3 has an elastic tendency to squeeze the lifting member 581 downward away from the side of the inner wall of the oil storage tank 1, so that the side of the extrusion member 54 close to the inner wall of the oil storage tank 1 has a tendency to move upward, so that the first sealing ring 511 has a tendency to move upward, and then the first filling member 514 can be inserted more deeply into the first elastic gap 512, and the first sealing portion 513 can better abut against the inner wall of the oil storage tank 1.

[0062] Reference Figure 4 At the same time, an extension ring 573 is extended below the protrusion 57. By "thickening" the protrusion 57 at the position of the extension ring 573, the protrusion 57 at the position of the extension ring 573 is not easy to deform, or the deformation is small, so that the lifting member 581 can rotate with the position of the extension ring 573 as the rotation center.

[0063] Reference Figure 4 and Figure 5 When the lifting member 581 is arranged in a whole ring, since the lifting member 581 is made of hard material, such as metal, even under the extrusion of the extrusion spring 3, the lifting member 581 is not likely to have the inner ring drop and the outer ring tilt. Therefore, in this embodiment, a plurality of lifting members 581 are arranged, and the plurality of lifting members 581 form a ring arrangement, and correspondingly, a plurality of lifting grooves 58 are also arranged, and the lifting members 581 correspond to the lifting grooves 58 one by one.

[0064] Reference Figure 4 Furthermore, the piston plate 4 is provided with a first placement groove 41 corresponding to and communicating with the lifting groove 58, and a first abutting strip 42 is embedded in the first placement groove 41, the top of the first abutting strip 42 abuts against the extrusion spring 3, and the bottom of the first abutting strip 42 abuts against the top of the lifting member 581. The protruding portion 57 is provided with a second placement groove 571 communicating with the lifting groove 58, and a second abutting strip 572 is embedded in the second placement groove 571, the top of the second abutting strip 572 abuts against the bottom of the first sealing ring 511, and the bottom of the second abutting strip 572 abuts against the lifting member 581.

[0065] Reference Figure 4 By providing the first abutment strip 42, the elastic force applied by the extrusion spring 3 to the lifting member 581 can be better transmitted, and by providing the second abutment strip 572, the lifting member 581 can better tend to move the first sealing ring 511 upward.

[0066] When the first sealing ring 511 and the second sealing ring 521 are arranged in a conventional ring shape, after the first sealing ring 511 and the second sealing ring 521 are used for a long time, the first sealing ring 511 and the second sealing ring 521 are prone to aging, so that the first sealing ring 511 and the second sealing ring 521 cannot be well pressed against the inner wall of the oil storage tank 1. In this embodiment, by setting the first filling piece 514 and the second filling piece 524, and squeezing the second filling piece 524 by the sliding piece 561, and squeezing the first filling piece 514 by the connecting piece 551 and the lifting piece 581, the first sealing part 513 and the second sealing part 523 can better abut against the inner wall of the oil storage tank 1.

[0067] The implementation principle of a pressure differential automatic oil pressing device in an embodiment of the present application is as follows: when installing the piston part 2 and the extrusion spring 3, the first sealing ring 511, the first filling piece 514, the second sealing ring 521, the second filling piece 524, the first abutment strip 42, the second abutment strip 572, the lifting piece 581, the extrusion piece 54, the sliding piece 561 and the connecting piece 551 can be embedded into the corresponding parts of the piston part 2 first, and then the end of the extrusion spring 3 is placed in the installation cavity 21, and then the top end cover 15 is covered; then oil is added to the oil storage tank 1 through a vacuum oiling machine. At this time, the air in the oil storage tank 1 is discharged through the overflow hole 11. Finally, when the oil level in the oil storage tank 1 reaches the height of the overflow hole 11, the air in the oil-free cavity 14 is extracted. At this time, the extrusion spring 3 is abutted against the top end cover 15 and is in a compressed state.

[0068] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pressure differential type automatic oil pressing device, characterized in that: It comprises an oil storage tank (1), a piston portion (2) slidably arranged in the oil storage tank (1), and a compression spring (3) for abutting against the piston portion (2), the piston portion (2) dividing the internal cavity of the oil storage tank (1) into an oil storage cavity (13) and an oil-free cavity (14), the oil-free cavity (14) being located above the oil storage cavity (13), the compression spring (3) being located in the oil-free cavity (14), a first sealing ring (511) for abutting against the inner wall of the oil storage tank (1) being arranged on the circumferential outer wall of the piston portion (2), and an overflow hole (11) being opened on the side wall of the oil storage tank (1); The piston part (2) is provided with a second sealing ring (521) for abutting against the inner wall of the oil storage tank (1), and the second sealing ring (521) is located above the first sealing ring (511); The first sealing ring (511) is provided with a first elastic gap (512), and the first sealing ring (511) is provided with a first sealing portion (513) for contacting the inner wall of the oil storage tank (1), and the first sealing portion (513) has elastic potential energy for contacting the inner wall of the oil storage tank (1); The piston portion (2) comprises a piston plate (4) abutting against the extrusion spring (3) and a mounting cylinder (5) arranged above the piston plate (4); the mounting cylinder (5) and the piston plate (4) enclose a mounting cavity (21) for the end of the extrusion spring (3) to be embedded; the first sealing ring (511) and the second sealing ring (521) are both arranged on the mounting cylinder (5); and the radius of the extrusion spring (3) gradually increases from top to bottom; The first sealing ring (511) is provided with a first filling piece (514) in the first elastic gap (512), and the first filling piece (514) is used to press the first sealing portion (513) against the inner wall of the oil storage tank (1); The mounting cylinder (5) has a protrusion (57), the upper side wall of the protrusion (57) abuts against the lower side wall of the first sealing ring (511), the circumferential outer side wall of the piston plate (4) and the protrusion (57) are jointly provided with a lifting groove (58), and the lifting groove (58) is provided with a lifting member (581), and the extrusion spring (3) is used to squeeze the lifting member (581) away from the inner side wall of the oil storage tank (1).

2. A differential pressure automatic oil pressing device according to claim 1, characterized in that: The inner side wall of the installation tube (5) is provided with an installation groove (53), the installation groove (53) is located between the first sealing ring (511) and the second sealing ring (521), the installation groove (53) has a top groove wall (531) and a bottom groove wall (532), and the installation tube (5) is provided with an extrusion piece (54) in the installation groove (53) for extruding the top groove wall (531) and the bottom groove wall (532).

3. A differential pressure automatic oil pressing device according to claim 2, characterized in that: The top groove wall (531) is arranged to be inclined upward from a side close to the inner wall of the oil storage tank (1) to a side away from the inner wall of the oil storage tank (1).

4. A differential pressure automatic oil pressing device according to claim 2, characterized in that: A second elastic gap (522) is formed on the second sealing ring (521), the second sealing ring (521) has a second sealing portion (523) abutting against the inner wall of the oil storage tank (1), and the second sealing ring (521) is provided with a second filling piece (524) in the second elastic gap (522); The top of the extrusion member (54) is tightly abutted against the top groove wall (531); a sliding cavity (56) is provided on the top groove wall (531); the mounting tube (5) is provided with a sliding member (561) in the sliding cavity (56); the top of the sliding member (561) is abutted against the bottom of the second sealing ring (521); and the bottom of the sliding member (561) is abutted against the top of the extrusion member (54).

5. The differential pressure automatic oil pressing device according to claim 2, characterized in that: A connecting cavity (55) is provided on the bottom groove wall (532), and a connecting piece (551) is provided in the connecting cavity (55) of the mounting tube (5), the top of the connecting piece (551) abuts against the bottom of the extrusion piece (54), and the bottom of the connecting piece (551) abuts against the top of the first filling piece (514).

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