A cylinder block assembly with a bidirectional sealing lifelike piston leather cup

Abstract

The present invention discloses a cylinder block assembly with a bidirectional sealing biomimetic piston leather cup, which includes a biomimetic piston structure, a cylinder liner structure and a water suction and drainage structure; the biomimetic piston structure includes a piston rod, and a bidirectional sealing biomimetic piston leather cup is sleeved in the middle of the piston rod. The bidirectional sealing biomimetic piston leather cup includes an inner layer rubber cylinder and an outer layer rubber cylinder which are axially connected in the middle. The biomimetic piston assembly divides the inner cavity of the cylinder into two independent cavities. When the biomimetic piston assembly moves, one cavity absorbs water and the other cavity drains water, achieving the effect of "one cylinder with two cavities, one cycle and double action". The "one cylinder with two cavities" design reduces the flow pulse of the mud pump, improves the continuity and stability of the flushing medium. Compared with the single-acting mud pump, the piston stroke is greatly reduced, the working life of the piston is extended, and the technical problem of serious wear of the piston leather cup and low life in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling equipment, relates to an artificial piston cup, and specifically relates to a cylinder block assembly with a bidirectional sealing artificial piston cup. Background Art

[0002] The mud pump is an important equipment for drilling construction. In drilling operations, if the flushing medium is compared to blood, then the mud pump is the heart that drives the circulation of the flushing medium. The mud pump mainly converts the mechanical energy of the prime mover into the pressure energy of transporting the flushing medium by periodically changing the volume of the sealed working chamber, provides power for the flushing medium, and thus completes tasks such as driving downhole motor drills, carrying cuttings, cooling and flushing drill tools, and maintaining the borehole wall. Its performance level and service life directly affect drilling efficiency and construction costs.

[0003] Due to the harsh operating conditions, the current single-acting reciprocating mud pump has a low service life, which is a weak link in drilling construction equipment. According to statistics, 80% of the mud pump failures are caused by severe wear of the piston cup and poor sealing performance. The main reasons are as follows: For conventional single-acting reciprocating mud pumps, the mechanical efficiency is low and the flow pulse is large. When a large flow rate is required, limited by the number of cylinders and the action mode, only by increasing the stroke frequency of the mud pump can the pump volume be increased. Therefore, the piston cup wears too fast; during the working process, the piston cup and the wear-resistant cylinder liner move relative to each other reciprocally. Under the action of reciprocating alternating stress, the piston cup deforms. After multiple stress cycles, macroscopic cracks are formed on the surface of the cup, and then it is damaged; sand grains, cuttings, etc. in the flushing medium will exacerbate the friction and wear between the piston cup and the cylinder liner. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a cylinder block assembly with a bidirectional sealing artificial piston cup to solve the technical problem of low service life caused by severe wear of the piston cup in the existing technology.

[0005] To solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0006] A cylinder block assembly with a bidirectional sealing artificial piston cup includes an artificial piston structure, a cylinder liner structure, and a suction and drainage structure;

[0007] The described lifelike piston structure includes a piston rod, and a two-way sealed lifelike piston cup is sleeved in the middle of the piston rod. The two-way sealed lifelike piston cup includes an inner rubber cylinder and an outer rubber cylinder that are axially connected in the middle. The axial middle of the outer wall of the outer rubber cylinder is lower and the two sides are higher. A ring groove group composed of multiple ring grooves is arranged in the middle of the outer wall of the outer rubber cylinder. A plurality of polygonal grooves are evenly arranged on the outer walls of the outer rubber cylinder on both sides of the ring groove group; a polygonal column is arranged inside the polygonal groove;

[0008] The described cylinder liner structure includes a cylinder body sleeved on the piston rod. The cylinder body includes a front cylindrical cylinder, a rear cylindrical cylinder, and a circular cylinder connecting the front cylindrical cylinder and the rear cylindrical cylinder; positioning blocks are fixedly installed at the axial front end of the front cylindrical cylinder and the axial rear end of the rear cylindrical cylinder. The positioning blocks are sleeved on the piston rod; through valve mounting holes are arranged on both the front cylindrical cylinder and the rear cylindrical cylinder;

[0009] The described water absorption and drainage structure includes two water absorption one-way valves and two drainage one-way valves. The two water absorption one-way valves are respectively installed at the bottoms of the two valve mounting holes, and the two drainage one-way valves are respectively installed at the tops of the two valve mounting holes.

[0010] The present invention further includes the following features:

[0011] A cylinder liner is arranged on the inner wall of the circular cylinder, and the cylinder liner is in contact with the outer wall of the outer rubber cylinder.

[0012] The height difference between the axial middle and the two sides of the outer wall of the outer rubber cylinder (10202) is 0.4mm to 0.6mm.

[0013] Two pressing blocks are sleeved on the piston rod on both sides of the two-way sealed lifelike piston cup.

[0014] The inner rubber cylinder is made of hard rubber, and the outer rubber cylinder is made of wear-resistant rubber.

[0015] The width range of the ring groove is 1mm to 5mm, the depth range is 0.5mm to 3mm, and the distance between adjacent ring grooves is not less than 3mm and not more than 10mm.

[0016] The width range of the polygonal groove is 0.5mm to 2mm, and the depth range is 0.5 to 2mm.

[0017] The two positioning blocks are respectively fixed on the axial front end of the front cylindrical cylinder and the axial rear end of the rear cylindrical cylinder by bolts.

[0018] Two first sealing rings are arranged on the contact surface between the cylinder block and the positioning block; multiple second sealing rings are arranged between the positioning block and the piston rod.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0020] (Ⅰ) The biomimetic piston assembly in the present invention divides the inner cavity of the cylinder into two independent cavities. When the biomimetic piston assembly moves, one cavity sucks water and the other cavity discharges water, achieving the effect of "one cylinder with two cavities and one cycle with double action". The "one cylinder with two cavities" design reduces the flow pulse of the mud pump, improves the continuity and stability of the flushing medium. Compared with the single-acting mud pump, the piston stroke is greatly reduced, the working life of the piston is extended, and the technical problem of serious wear of the piston cup in the prior art resulting in low life is solved.

[0021] (Ⅱ) The principle of bionics is applied in the present invention. Taking the microstructures on the toes of tree frogs and other frogs as prototypes, a non-smooth surface composed of multiple polygon grooves arranged in an orderly manner is opened on the outer surface of the double-direction sealing biomimetic piston cup, so that the piston cup has excellent drag reduction and wear resistance effects. The annular groove structure of the double-direction sealing biomimetic piston cup can provide lubrication for the contact surface during the working process, and at the same time collect sand grains and rock cuttings on the contact surface, reducing the abrasive wear of the piston cup, and solving the technical problem of serious wear of the piston cup in the prior art resulting in low life.

[0022] (Ⅲ) In addition, by optimizing the size, structure shape, arrangement rule and quantity of the bionic prism unit body, the initiation and propagation of cracks on the surface of the cup can be effectively inhibited, and the fatigue resistance is improved; Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the overall structure of the double-acting biomimetic piston cylinder block assembly of the present invention.

[0024] Figure 2 It is a schematic diagram of the overall cross-section of the double-acting biomimetic piston cylinder block assembly of the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of the biomimetic piston in the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the double-direction biomimetic piston cup in the present invention.

[0027] Figure 5 It is a schematic diagram of the cross-section of the double-direction biomimetic piston cup in the present invention.

[0028] Figure 6 It is a front view schematic diagram of the double-direction biomimetic piston cup in the present invention.

[0029] The meanings of the reference numerals in the figure are as follows: 1 - lifelike piston structure, 2 - cylinder liner structure, 3 - water suction and drainage structure, 4 - pressing block, 5 - bolt, 6 - second sealing ring;

[0030] 101 - piston rod, 102 - double - seal lifelike piston leather cup;

[0031] 10201 - inner rubber cylinder, 10202 - outer rubber cylinder, 10203 - annular groove, 10204 - polygonal groove, 10205 - polygonal column;

[0032] 201 - cylinder block, 202 - positioning block, 203 - valve installation hole, 204 - cylinder liner, 205 - first sealing ring;

[0033] 20101 - front cylindrical cylinder, 20102 - rear cylindrical cylinder, 20203 - circular cylinder;

[0034] 301 - water - suction check valve, 302 - water - drainage check valve.

[0035] The following further elaborates on the specific content of the present invention in conjunction with embodiments. Specific Embodiments

[0036] It should be noted that all components in the present invention, without special instructions, are components known in the art.

[0037] The following gives specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present invention.

[0038] The present invention provides a cylinder block assembly with a double - seal lifelike piston leather cup, as Figures 1 to 6 shown, including a lifelike piston structure 1, a cylinder liner structure 2, and a water suction and drainage structure 3;

[0039] The lifelike piston structure 1 includes a piston rod 101. A double - seal lifelike piston leather cup 102 is sleeved in the middle of the piston rod 101. The double - seal lifelike piston leather cup 102 includes an inner rubber cylinder 10201 and an outer rubber cylinder 10202 that are axially connected in the middle. The outer wall of the outer rubber cylinder 10202 is lower in the middle and higher on both sides axially. A set of annular grooves composed of multiple annular grooves 10203 is arranged in the middle of the outer wall of the outer rubber cylinder 10202. A plurality of polygonal grooves 10204 are evenly opened on the outer wall of the outer rubber cylinder 10202 on both sides of the set of annular grooves; inside the polygonal groove 10204 is a polygonal column 10205;

[0040] The cylinder liner structure 2 includes a cylinder block 201 sleeved on the piston rod 101. The cylinder block 201 includes a front cylindrical cylinder 20101, a rear cylindrical cylinder 20102, and a circular cylinder 20103 connecting the front cylindrical cylinder 20101 and the rear cylindrical cylinder 20102. Positioning blocks 202 are fixedly installed at the axial front end of the front cylindrical cylinder 20101 and the axial rear end of the rear cylindrical cylinder 20102. The positioning blocks 202 are sleeved on the piston rod 101. Through valve mounting holes 203 are provided on both the front cylindrical cylinder 20101 and the rear cylindrical cylinder 20102.

[0041] The water suction and drainage structure 3 includes two water suction check valves 301 and two water drainage check valves 302. The two water suction check valves 301 are respectively installed at the bottoms of the two valve mounting holes 203, and the two water drainage check valves 302 are respectively installed at the tops of the two valve mounting holes 203.

[0042] In the above technical solution, the life-like piston structure 1 divides the inner cavity of the cylinder block 101 into two independent cavities on the left and right. A water suction check valve 301 and a water drainage check valve 302 are respectively installed in each cavity. Refer to Figure 2 , when the piston structure 1 moves to the right, the volume of the left cavity increases, and a negative pressure area is formed in the inner cavity. The left water suction check valve 301 opens, and the water drainage check valve 302 closes for water suction work. At the same time, the volume of the right cavity decreases, the pressure in the inner cavity increases, forcing the right water suction check valve 301 to close and the water drainage check valve 302 to open for water drainage action.

[0043] When the life-like piston structure 1 reaches the rightmost end of the stroke, the water suction action in the left cavity ends, and the water drainage action in the right cavity ends. Then, under the drive of an external force, the life-like piston structure 1 starts to move to the left, and the volume of the left cavity decreases.

[0044] For water drainage action, the volume of the right cavity increases, and a negative pressure area is formed in the cavity for water suction action. When the life-like piston structure 1 reaches the leftmost end of the stroke, a reciprocating motion of one cycle is completed. It can be seen that when the piston completes a reciprocating motion of one cycle, the left and right cavities each complete one water suction and drainage action. For the entire cylinder block assembly, the entire cylinder block assembly completes two water suction and drainage actions, that is, the effect of "one cylinder with two cavities, one cycle and double action" is achieved. The "one cylinder with two cavities" design reduces the flow pulse of the mud pump, improves the continuity and stability of the flushing medium. Compared with a single-action mud pump, the piston stroke is greatly reduced, the working life of the piston is extended, and the technical problem of serious wear of the piston cup in the prior art resulting in low life is solved.

[0045] In addition, applying the principle of bionics, taking the microstructures on the toes of frogs such as tree frogs as prototypes, a non-smooth surface composed of multiple polygon grooves arranged orderly is opened on the outer surface of the bionic piston leather cup with double-sided sealing, enabling the piston leather cup to have excellent drag reduction and wear resistance effects. The annular groove structure of the bionic piston leather cup with double-sided sealing can provide lubrication for the contact surface during the working process, and at the same time collect sand grains and cuttings on the contact surface, reducing the abrasive wear of the piston leather cup, and also solving the technical problem of serious wear and low service life of the piston leather cup in the prior art.

[0046] Specifically, a cylinder liner 204 is provided on the inner wall of the circular cylinder 20103, and the cylinder liner 204 contacts the outer wall of the outer rubber cylinder 10202.

[0047] In the above technical solution, the cylinder liner is made of zirconia ceramics. The zirconia ceramic cylinder liner is inlaid on the inner hole wall of the cylinder body according to a certain process. The zirconia ceramic cylinder liner is based on zirconia and is formed by high-temperature sintering. During the sintering preparation process, the phase transformation toughening technology is adopted to improve the wear resistance, corrosion resistance, high pressure resistance, strength and hardness performance of the ceramic cylinder liner. After sintering, a precision honing treatment process is adopted to improve the surface finish of its inner cavity and reduce the loss of the inner cavity of the cylinder liner to the piston leather cup.

[0048] Specifically, the height difference between the axial middle part and both sides of the outer wall of the outer rubber cylinder (10202) is 0.4 mm to 0.6 mm, which facilitates the flow of sand grains and cuttings on the contact surface between the outer rubber cylinder 10202 and the cylinder liner 204 to the annular groove, and reduces the wear caused by abrasive grains between the outer wall of the outer rubber cylinder 10202 and the inner wall of the cylinder liner 204.

[0049] Preferably, the height difference is 0.5 mm.

[0050] Specifically, two pressing blocks 4 are sleeved on the piston rods 101 on both sides of the bionic piston leather cup 102 with double-sided sealing, for fixing the bionic piston leather cup 102 with double-sided sealing on the piston rods 101.

[0051] Specifically, the inner rubber cylinder 10201 is made of hard rubber, and the outer rubber cylinder 10202 is made of wear-resistant rubber. The internal hard rubber provides force support for the piston movement, and the external wear-resistant rubber enhances the wear resistance and sealing performance of the piston.

[0052] Specifically, the width range of the annular groove 10203 is 1 mm to 5 mm, the depth range is 0.5 mm to 3 mm, and the distance between adjacent annular grooves 10203 is not less than 3 mm and not more than 10 mm.

[0053] Preferably, three annular grooves are provided, the width of the annular groove is 2 mm, the depth is 1.5 mm, and the distance between adjacent annular grooves is 4 mm.

[0054] Specifically, the width range of the polygonal groove 10204 is 0.5 mm to 2 mm, and the depth range is 0.5 to 2 mm.

[0055] Preferably, the polygonal groove is a hexagonal groove, forming a hexagonal cylinder. The width of the hexagonal groove is 1 mm and the depth is 0.8 mm. Optimizing the structural shape, size, arrangement pattern and quantity of the polygonal groove can effectively inhibit the initiation and propagation of cracks on the surface of the leather cup, and improve the fatigue resistance.

[0056] Specifically, the two positioning blocks 202 are respectively fixed to the axial front end of the front cylindrical cylinder 20101 and the axial rear end of the rear cylindrical cylinder 20102 by bolts 5, which is convenient for installation and disassembly.

[0057] Specifically, two first sealing rings 205 are arranged on the contact surface between the cylinder block 201 and the positioning block 202, and multiple second sealing rings 6 are arranged between the positioning block 202 and the piston rod 101. The first sealing ring 205 and the second sealing ring 6 ensure the sealing performance and reliability inside the cylinder block 201.

Claims

1. A cylinder block assembly with a bidirectional sealing biomimetic piston cup, characterized in that, It includes a lifelike piston structure (1), a cylinder liner structure (2) and a water suction and drainage structure (3); The lifelike piston structure (1) includes a piston rod (101). A two-way sealed lifelike piston leather cup (102) is sleeved in the middle of the piston rod (101). The two-way sealed lifelike piston leather cup (102) includes an inner rubber cylinder (10201) and an outer rubber cylinder (10202) axially connected in the middle. The outer wall of the outer rubber cylinder (10202) is low in the middle and high on both sides axially. A ring groove group composed of multiple ring grooves (10203) is arranged in the middle of the outer wall of the outer rubber cylinder (10202). A plurality of polygonal grooves (10204) are evenly arranged on the outer walls of the outer rubber cylinder (10202) on both sides of the ring groove group; A polygonal column (10205) is arranged inside the polygonal groove (10204); The cylinder liner structure (2) includes a cylinder block (201) sleeved on the piston rod (101). The cylinder block (201) includes a front cylindrical cylinder (20101), a rear cylindrical cylinder (20102) and a circular cylinder (20103) connecting the front cylindrical cylinder (20101) and the rear cylindrical cylinder (20102); Positioning blocks (202) are fixedly installed at the front end of the front cylindrical cylinder (20101) and the rear end of the rear cylindrical cylinder (20102) axially. The positioning blocks (202) are sleeved on the piston rod (101); Through valve installation holes (203) are arranged on both the front cylindrical cylinder (20101) and the rear cylindrical cylinder (20102); The water suction and drainage structure (3) includes two water suction check valves (301) and two water drainage check valves (302). The two water suction check valves (301) are respectively installed at the bottoms of the two valve installation holes (203), and the two water drainage check valves (302) are respectively installed at the tops of the two valve installation holes (203); A cylinder liner (204) is arranged on the inner wall of the circular cylinder (20103). The cylinder liner (204) is in contact with the outer wall of the outer rubber cylinder (10202); Two pressure blocks (4) are sleeved on the piston rod (101) on both sides of the two-way sealed lifelike piston leather cup (102); The two positioning blocks (202) are respectively fixed on the front end of the front cylindrical cylinder (20101) and the rear end of the rear cylindrical cylinder (20102) axially through bolts (5).

2. The cylinder block assembly with a bidirectional sealing artificial piston cup according to claim 1, characterized in that, The height difference between the middle and both sides of the outer wall of the outer rubber cylinder (10202) is 0.4 mm to 0.6 mm.

3. The cylinder block assembly with a two-way sealed life-like piston cup as described in claim 1, characterized in that, The inner rubber cylinder (10201) is made of hard rubber, and the outer rubber cylinder (10202) is made of wear-resistant rubber.

4. The cylinder block assembly with a two-way sealed life-like piston leather cup as described in claim 1, characterized in that, The width range of the ring groove (10203) is 1 mm to 5 mm, the depth range is 0.5 mm to 3 mm, and the distance between adjacent ring grooves (10203) is not less than 3 mm and not more than 10 mm.

5. The cylinder block assembly with a bidirectional sealing artificial piston cup according to claim 1, characterized in that, The width range of the described polygonal groove (10204) is 0.5 mm to 2 mm, and the depth range is 0.5 to 2 mm.

6. The cylinder block assembly with a bidirectional sealing biomimetic piston cup as described in claim 1, characterized in that, Two first sealing rings (205) are provided on the contact surface between the described cylinder block (201) and the positioning block (202), and multiple second sealing rings (6) are provided between the described positioning block (202) and the piston rod (101).

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