Deep sea piston type seawater pump

Abstract

The invention relates to a sea water pump, in particular to a deep sea piston type sea water pump. Comprising a water side cylinder, an oil side cylinder and a piston rod which are coaxially arranged, and the top of the oil side cylinder is connected with the top of the water side cylinder; one end of the piston rod extends into a cavity of the water side cylinder and is connected with a water side piston in the water side cylinder, and the other end of the piston rod extends into a cavity of the oil side cylinder and is connected with an oil side piston in the oil side cylinder; the oil side cylinder is further provided with a buffering structure, the buffering structure comprises a structure that the two ends of an oil side piston are of step structures, an oil side cylinder cavity comprises a straight barrel cavity and step cavities located at the two ends of the straight barrel cavity, and the step structures are in clearance fit with the step cavities. The oil side cylinder is provided with a one-way valve communicated with the stepped cavity; the deep sea piston type sea water pump has the advantages of being small and exquisite in structure, good in deep sea environment adaptability and high in mechanical efficiency.

Description

Technical Field

[0001] The invention relates to a seawater pump, in particular to a deep-sea piston seawater pump. Background Art

[0002] As my country's exploration and development of the ocean, especially the deep sea, gradually deepens, the invention and innovation of deep sea exploration equipment and deep sea engineering machinery have more important practical significance. The activity depth and performance parameters of exploration equipment and engineering machinery directly affect the scope, efficiency and capacity of deep sea exploration and development. At present, domestic seawater pumps are large in size. Because the piston frequently reciprocates and hits the bottom of the cylinder and the guide sleeve during the operation of the seawater pump, the operation vibration is large and the failure rate is high, and the service life is short. Summary of the invention

[0003] The present invention aims to provide a deep-sea piston seawater pump which has stable operation and long service life.

[0004] A deep-sea piston seawater pump in this scheme includes a coaxially arranged water side cylinder, an oil side cylinder and a piston rod, the top of the oil side cylinder is connected to the top of the water side cylinder; one end of the piston rod extends into the water side cylinder cavity and is connected to the water side piston in the water side cylinder, and the other end of the piston rod extends into the oil side cylinder cavity and is connected to the oil side piston in the oil side cylinder; the water side cylinder is driven by the hydraulic thrust of the oil side cylinder. It also includes a buffer structure, the buffer structure includes a stepped structure at both ends of the oil side piston, the oil side cylinder cavity includes a straight cylinder cavity and a stepped cavity at both ends thereof, and the stepped structure is matched with the stepped cavity gap; the oil side cylinder is provided with a one-way valve connected to the stepped cavity. As the stepped structure of the oil side piston enters the stepped cavity, the oil can only flow into the one-way valve through the gap between the stepped structure and the stepped cavity after being squeezed by the oil side piston, the oil flow gap is reduced, and the pressure gradually increases, forcing the oil side piston to move slower, reducing the impact of the oil side piston on the top or bottom of the oil side cylinder during movement. The oil is finally squeezed by the oil side piston and flows out through the one-way valve. The oil side piston compresses the oil to generate heat, that is, the piston kinetic energy is converted into oil heat energy. This heat energy is brought to the outside of the oil side cylinder by the oil external circulation and cooled by seawater immersion. Since the piston rod is also connected to the water side piston, it can also prevent the water side piston from impacting the top or bottom of the water side cylinder during movement.

[0005] Furthermore, the water side cylinder is also provided with a secondary cavity, which is arranged in parallel with the water side cylinder cavity; the water side cylinder cavity includes a water side rod cavity and a water side rodless cavity, and the water side rod cavity and the secondary cavity are connected through a water hole. The working medium in the water side rod cavity is led to the bottom of the water side cylinder through the water hole and the secondary cavity in turn, canceling the connection of the external intermediate pipeline of the conventional water pump cylinder, which not only reduces the maximum external size of the seawater pump, but also greatly reduces the occupied space; at the same time, it can also avoid the situation that the external intermediate pipeline is prone to unstable connection or even falling off.

[0006] Furthermore, the bottom of the water side cylinder is also fixedly connected to a mounting base, and the mounting base is provided with a first water inlet and a second water inlet; the water side rodless cavity is connected to the first water inlet, and the auxiliary cavity is connected to the second water inlet. The water hole and the second water inlet can be directly connected through a static seal. The mounting base is connected to the water side cylinder and also serves as a cylinder cover of the water side cylinder.

[0007] Furthermore, the cross section of the water side cylinder is a polygonal structure. Under the condition that the wall thickness of the water side cylinder cavity and the auxiliary cavity meets the requirements, the water side cylinder with a polygonal structure uses less material and is lighter than the water side cylinder with a conventional circular structure.

[0008] Furthermore, a proximity switch is included, which is located on the outer wall of the oil side cylinder and close to the extreme positions of the two ends of the oil side piston. When the oil side piston moves to the proximity switch, the oil side piston can be controlled to decelerate through the control program to achieve the purpose of decelerating in advance before the oil side piston runs to the extreme position. In conjunction with the buffer structure, the impact of the oil side piston on the top or bottom of the oil side cylinder during movement can be further reduced, thereby extending the service life.

[0009] Furthermore, the peripheral sides of the water side piston and the oil side piston are provided with a plurality of annular guide belts and at least one seal, and the guide belts and the seals are arranged at intervals; the guide belts have a radial support function, which can prevent the water side cylinder from being pulled by the water side piston. The seal is used to isolate the working medium in the rodless cavity and the rod cavity in the water side cylinder. This prevents the working medium in the rodless cavity from communicating with the working medium in the rod cavity, causing the water side cylinder and the water side piston to fail to operate normally.

[0010] Furthermore, the water side piston is also provided with a scraper ring, which is located at both ends of the water side piston. The scraper ring can remove dirt attached to the water side cylinder cavity, so that the present invention has a strong anti-pollution ability, thereby improving its operational reliability; at the same time, it ensures that it can still work normally when the filtration accuracy of the working medium seawater is not higher than 40μm. A pressure relief hole is provided between the scraper ring and the adjacent seal, and the pressure relief hole is connected to the water side cylinder cavity. When the water side piston moves, the pressure relief hole can prevent the space between the scraper ring and the seal on the water side piston from being pressurized.

[0011] Furthermore, the guide belt and the seal of the water side piston sleeve are located between the scraper rings at both ends of the water side piston; the seal close to the scraper ring is a one-way seal, and the other seals are two-way seals. While ensuring the sealing performance, the friction between the seal and the water side cylinder cavity is reduced, which is conducive to improving the mechanical efficiency.

[0012] Furthermore, the oil-side cylinder comprises a cylinder bottom cover, a cylinder body, and a connecting cover which are fixedly connected in sequence, and the connecting cover is fixedly connected to the water-side cylinder; the one-way valve is fixedly connected to the cylinder bottom cover and the connecting cover.

[0013] Furthermore, there is an installation gap between the installation end of the cylinder bottom cover and the port of the cylinder body, and between the installation end of the connecting cover and the port of the cylinder body; the one-way valve is connected to the step cavity through the installation gap. After being squeezed by the oil side piston, the oil enters the one-way valve through the space between the step structure and the step cavity, throttling the oil and ensuring the low-speed movement of the oil side piston.

[0014] The advantages of the present invention are:

[0015] 1) Buffering and vibration reduction structure: Through the matching gap between the oil side piston and the oil side cylinder, the oil flow space is controlled to reduce the impact of the oil side piston on the top or bottom of the oil side cylinder during movement. At the same time, the buffering and vibration reduction effect of the water side cylinder can be optimized, and it has a good buffering and vibration reduction structure;

[0016] 2) It has a new sealing structure: the one-way seal and the two-way seal are used together to reduce the number of seals used and further improve the sealing performance. The new sealing structure cooperates with the scraper rings set at both ends of the water side piston to ensure that it can still work normally when the filtration accuracy of the working medium seawater is not higher than 40μm.

[0017] 3) High mechanical efficiency: The kinetic energy of the oil-side piston is converted into thermal energy of the oil. This thermal energy is brought to the seawater through external circulation to cool it down, and then circulated to the oil-side cylinder cavity, so that the oil temperature is always maintained at a suitable working temperature; due to the small number of seals, when used in conjunction with the guide belt, the friction between the seal and the water-side cylinder cavity can be kept moderate, reducing friction loss.

[0018] 4) Compact structure: The connection of the intermediate pipeline outside the conventional water pump cylinder is cancelled. Compared with the conventional seawater pump, the present invention not only reduces the maximum external dimensions, but also greatly reduces the occupied space.

[0019] 5) Good adaptability to deep-sea environment: All parts of the present invention are made of duplex stainless steel after solid solution treatment, σb≥620MPa; ensuring that the material is not only high in strength but also resistant to seawater corrosion; it can withstand 1500 meters of seawater pressure in the deep sea and can be applied to various underwater and deep-sea detection and engineering machinery.

[0020] 6) Smooth operation and low failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a deep-sea piston seawater pump of the present invention;

[0022] Figure 2 for Figure 1 Enlarged view of M in the middle;

[0023] Figure 3 It is a structural schematic diagram of an oil side cylinder in a deep-sea piston seawater pump of the present invention;

[0024] Figure 4 This is a working schematic diagram of a deep-sea piston seawater pump according to the present invention;

[0025] Figure 5 for Figure 4 Enlarged view of middle G;

[0026] Figure 6 This is a schematic diagram of the operation of the oil side piston in a deep sea piston type seawater pump of the present invention;

[0027] Figure 7 It is a partial schematic diagram of an oil side cylinder of a deep-sea piston seawater pump of the present invention;

[0028] Figure 8 for Figure 7 Enlarged view of middle F;

[0029] Fig. 9 It is a structural schematic diagram of a water side cylinder in a deep-sea piston seawater pump of the present invention;

[0030] Fig.10 It is a structural schematic diagram of a mounting base in a deep-sea piston seawater pump of the present invention.

[0031] In the figure, 1 is a water side cylinder, 2 is an oil side cylinder, 3 is a piston rod, 4 is a water side piston, 5 is an oil side piston, 6 is a stepped cavity, 7 is a straight cylinder cavity, 8 is a stepped structure, 9 is a one-way valve, 10 is a water side rod cavity, 11 is a secondary cavity, 12 is a water hole, 13 is a mounting base, 14 is a first water inlet, 15 is a second water inlet, 16 is a proximity switch, 17 is a protective cover, 18 is a guide belt, 19 is a seal, 20 is a scraper ring, 2 1 is the pressure relief hole, 22 is the installation gap, 23 is the cylinder bottom cover, 24 is the cylinder body, 25 is the connecting cover, 26 is the guide sleeve, 27 is the oil hole, 28 is the rodless cavity on the water side, 29 is the rod cavity on the oil side, 30 is the rodless cavity on the oil side, 31 is the first layer of stepped structure, 32 is the second layer of stepped structure, 33 is the first layer of stepped cavity, 34 is the second layer of stepped cavity, 35 is the dust ring, 36 is the water seal, 37 is the buffer seal, and 38 is the O-ring. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0033] according to Figures 1 to 10As shown, a deep-sea piston seawater pump in the present scheme includes a coaxially arranged water side cylinder 1, an oil side cylinder 2 and a piston rod 3, and the top of the oil side cylinder 2 is connected to the top of the water side cylinder 1. One end of the piston rod 3 extends into the cavity of the water side cylinder 1 and is connected to the water side piston 4 in the water side cylinder 1, and the other end of the piston rod 3 extends into the cavity of the oil side cylinder 2 and is connected to the oil side piston 5 in the oil side cylinder 2, so that the water side cylinder 1 is driven by the hydraulic thrust of the oil side cylinder 2. Preferably, the piston rod 3 and the oil side piston 5 are an integral structure, and the piston rod 3 and the water side piston 4 are fixedly connected by a nut. A buffer structure is also included, and the buffer structure includes a stepped structure 8 at both ends of the oil side piston 5, and the cavity of the oil side cylinder 2 includes a straight cylindrical cavity 7 and a stepped cavity 6 located at both ends thereof, wherein the stepped structure 8 and the stepped cavity 6 are clearance-matched. Preferably, the buffer structure is a two-stage buffer structure, that is, the stepped structure 8 at both ends of the oil side piston 5 is a two-layer stepped structure, and correspondingly, the stepped cavity 6 at both ends of the oil side cylinder 2 is also a two-layer stepped cavity 6. A one-way valve 9 is provided at each end of the oil side cylinder 2, which is connected to the stepped cavity 6 at both ends. Figure 3 , 4 As shown, the buffer structure can also be set as a three-stage buffer structure, a four-stage buffer structure, etc. according to needs. In the present invention, the water side cylinder 1, the oil side cylinder 2 and the water side piston 4 are preferably made of stainless steel or titanium alloy. The one-way valve 9 is preferably a one-way throttle valve.

[0034] In this embodiment, the cross section of the water side cylinder 1 is a polygonal structure. The water side cylinder 1 is also provided with a secondary cavity 11. Specifically, the cavity of the water side cylinder 1 is coaxial with the water side cylinder 1. The secondary cavity 11 is located at a corner of the polygonal structure of the water side cylinder 1 and is arranged parallel to the cavity of the water side cylinder 1. Fig. 9 As shown. While ensuring that the water side cylinder 1 cavity and the auxiliary cavity 11 have sufficient wall thickness, the weight of the water side cylinder 1 itself is reduced. In this embodiment, an octagonal forging is preferred. The water side cylinder 1 cavity includes a water side rod cavity 10 and a water side rodless cavity 28, and the water side rod cavity 10 and the auxiliary cavity 11 are connected through a water hole 12. This structure does not require additional pipelines to be set on the outside of the water side cylinder 1 to lead the working medium in the water side rodless cavity 28 to the bottom of the water side cylinder 1. Preferably, the water hole 12 is set close to the top of the water side cylinder 1, and when the water side piston 4 moves to the extreme position close to the water side cylinder 1, the rod cavity is still connected to the water hole 12. In order to ensure the integrity of the water side cylinder 1, the water hole 12 is preferably an inclined hole.

[0035] In this embodiment, the bottom of the water side cylinder 1 is also bolted to a mounting base 13, and the mounting base 13 is provided with a first water port 14 and a second water port 15. The water side rodless cavity 28 is connected to the first water port 14, and the auxiliary cavity 11 is connected to the second water port 15. With this structure, the water hole 12 and the second water port 15 are directly connected through a static seal, which can avoid the situation where the external intermediate pipeline is prone to unstable connection or even falling off. Specifically, the working medium water enters the rod cavity and the rodless cavity through the first water port 14 and the second water port 15 respectively. The mounting base 13 is connected to the water side cylinder 1, and also serves as a cylinder cover.

[0036] In this embodiment, the proximity switch 16 is located at the outer wall of the oil side cylinder 2 and at the extreme position close to the two ends of the oil side piston 5. That is, one proximity switch 16 is located at the end of the oil side rod chamber 29, and the other proximity switch 16 is located at the end of the oil side rodless chamber 30. When the oil side piston 5 moves to the proximity switch 16, the control program is used to slow down the oil side piston 5 before it runs to the extreme position. With the buffer structure, the impact of the oil side piston 5 on the top or bottom of the oil side cylinder 2 during movement can be further reduced, thereby extending the service life. In this embodiment, the proximity switch 16 is set 20mm to 25mm before the extreme position at both ends of the running stroke of the oil side piston 5. Preferably, the proximity switch 16 is set 20mm before the extreme position. A protective cover is provided outside the proximity switch 16, and the protective cover is bolted to the outer wall of the oil side cylinder 2. The protective proximity switch 16 can work normally under high pressure of 1500m underwater. Specifically, the electrical wire of the proximity switch 16 at one end of the oil-side rod cavity 29 is led from the inside of a stainless steel pipe in the protective cover to the protective cover at one end of the oil-side rodless cavity 30, and then led out through a watertight joint.

[0037] In this embodiment, the water side piston 4 is provided with two scraper rings 20, and the two scraper rings 20 are respectively located at the two ends of the water side piston 4. The water side piston 4 is also provided with three seals 19 and two guide belts 18, and the guide belts 18 and the seals 19 are both located between the two scraper rings 20 and arranged at intervals. Among them, one is a two-way combined seal and is located in the middle of the water side piston 4; the remaining two are one-way seals. Specifically, seven annular grooves are provided on the circumference of the water side piston 4 for placing the guide belts 18, the seals 19 and the scraper rings 20. The guide belt 18 is preferably made of PTFE material. The seal 19 can be a sealing ring. When the water side piston 4 reciprocates along the axial direction, the guide belt 18 arranged between the one-way seal 19 and the two-way seal 19 has a radial support function, so that the friction between the seal 19 and the water side cylinder 1 is kept moderate; the one-way seal 19 and the two-way seal 19 are used in combination, and the number of seals 19 required is small, the friction loss is small, and the mechanical efficiency is improved. At the same time, the scraper ring 20 can remove the dirt attached to the cavity of the water side cylinder 1, so that the present invention has a strong anti-pollution ability, thereby improving the working stability and operation reliability. A pressure relief hole 21 is provided between the scraper ring 20 and the adjacent one-way seal, and the pressure relief hole 21 is connected to the water side rod cavity 10 and the water side rodless cavity 28 respectively. Figure 2 When the water side piston 4 moves, the pressure relief hole 21 can prevent the pressure from being trapped between the scraper ring 20 and the seal 19 on the water side piston 4.

[0038] A seal 19 and two guide strips 18 are sleeved in the middle of the oil side piston 5, and the seal 19 is located between the two guide strips 18. Three annular grooves are provided on the circumference of the oil side piston 5 for placing the seal 19 and the two guide strips 18.

[0039] In this embodiment, the oil-side cylinder 2 includes a cylinder bottom cover 23, a cylinder body 24, and a connecting cover 25 which are bolted in sequence, and the connecting cover 25 is bolted to the water-side cylinder 1. Two one-way valves 9 are bolted to the side walls of the cylinder bottom cover 23 and the connecting cover 25, respectively. An oil hole 27 is opened on the cylinder bottom cover 23 and the connecting cover 25, respectively. An installation gap 22 is left between the mounting end of the cylinder bottom cover 23 and the port of the cylinder body 24, and between the mounting end of the connecting cover 25 and the port of the cylinder body 24. The stepped chamber 6 is connected to the one-way valve 9 through the oil hole 27 and the installation gap 22 in sequence.

[0040] A guide sleeve 26 is provided in the rod cavity 10 on the water side, and the guide sleeve 26 is arranged adjacent to the connection cover 25. A plurality of seals 19 and guide belts 18 are provided between the guide sleeve 26 and the piston rod 3, specifically dust ring 35, water seal 36, guide belt 18, seal, buffer seal 37, guide belt 18, and O-ring 38 and retaining ring are provided between the guide sleeve 26 and the connection cover 25, and between the guide sleeve 26 and the water side cylinder 1. A plurality of annular grooves are provided on the guide sleeve 26 for fixing the dust ring 35, water seal 36, guide belt 18, seal, buffer seal 37, O-ring 38 and retaining ring, wherein the O-ring 38 and retaining ring are located in the same annular groove. The guide sleeve 26, dust ring 35 and water seal 36 of this structure can prevent impurities and water (working medium) in the water-side rod cavity 10 from entering between the guide sleeve 26 and the piston rod 3. The seal, buffer seal 37, O-ring 38 and retaining ring can prevent oil from entering the water-side rod cavity 10. At the same time, the guide belt 18 can also provide a certain radial supporting force to prevent large friction losses of the seal 19.

[0041] During the working process of the present invention: Figure 4 As shown, when the rodless chamber of the hydraulic cylinder flows with oil, the piston rod 3 moves toward the water side cylinder 1; the water side piston 4 retracts, and at this time the water side rod chamber 10 absorbs water through the auxiliary chamber 11, and the water side rodless chamber 28 drains water. When the oil side rod chamber 29 flows with oil, the oil side piston 5 retracts; the water side piston 4 extends, and at this time the water side rodless chamber 28 absorbs water, and the water side rod chamber 10 drains water. This working mode can transport gas and water in two phases and short-term gas.

[0042] The operating principle of the secondary buffer structure: When the first step of the oil side piston 5 begins to enter the step cavity 6 at the end of the oil side cylinder 2 cavity, Figure 6 As shown, after being squeezed by the oil side piston 5, the oil can only flow to the one-way throttle valve through the annular space between the first layer of stepped structure 31 and the second layer of stepped cavity 34 of the oil side piston 5, and the oil flow space is reduced; when the first layer of stepped structure 31 of the oil side piston 5 begins to enter the first layer of stepped cavity 33, as shown in FIG. Figure 7 As shown, after the oil is squeezed by the oil side piston 5, it flows to the one-way throttle valve through the matching gap between the step structure 8 and the step chamber 6. The oil flow space is further reduced, the oil flow rate is reduced, and the impact of the oil side piston 5 on the cylinder bottom cover 23 or the connecting cover 25 during movement is greatly reduced. When the oil side piston 5 completes its stroke, the oil flows from the one-way throttle valve into the water and is cooled by immersion. The kinetic energy of the oil side piston 5 is converted into the thermal energy of the oil through the secondary buffer structure, and then the thermal energy is brought out of the oil cylinder by the external circulation, and the oil is reduced to a suitable temperature by immersion.

[0043] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A deep sea piston seawater pump, characterized in that: It includes a coaxially arranged water side cylinder, an oil side cylinder and a piston rod, the top of the oil side cylinder is connected to the top of the water side cylinder; one end of the piston rod extends into the water side cylinder cavity and is connected to the water side piston in the water side cylinder, and the other end of the piston rod extends into the oil side cylinder cavity and is connected to the oil side piston in the oil side cylinder; it also includes a buffer structure, the buffer structure includes two ends of the oil side piston as a stepped structure, the two ends of the oil side cylinder cavity are stepped cavities, the stepped structure and the stepped cavity are gap-matched; the oil side cylinder is provided with a one-way valve connected to the stepped cavity.

2. A deep sea piston seawater pump according to claim 1, characterized in that: The water side cylinder is also provided with a secondary cavity, which is arranged parallel to the water side cylinder cavity; the water side cylinder cavity includes a water side rod cavity and a water side rodless cavity, and the water side rod cavity and the secondary cavity are connected through a water hole.

3. A deep sea piston seawater pump according to claim 2, characterized in that: The bottom of the water side cylinder is also fixedly connected to a mounting base, and the mounting base is provided with a first water inlet and a second water inlet; the water side rodless cavity is connected to the first water inlet, and the auxiliary cavity is connected to the second water inlet.

4. A deep sea piston seawater pump according to any one of claims 1 to 3, characterized in that: The cross section of the water side cylinder is a polygonal structure.

5. A deep sea piston seawater pump according to claim 1, characterized in that: It also includes a proximity switch, which is located on the outer wall of the oil-side cylinder and close to the extreme positions of the two ends of the oil-side piston.

6. A deep sea piston seawater pump according to claim 1, characterized in that: The water-side piston and the oil-side piston are both sleeved with a plurality of guide belts and at least one sealing member, and the guide belts and the sealing member are spaced apart; the guide belts have a radial supporting function.

7. A deep sea piston seawater pump according to claim 6, characterized in that: Both ends of the water side piston are provided with scraper rings; a pressure relief hole is provided between the scraper ring and the adjacent sealing member, and the pressure relief hole is communicated with the water side cylinder cavity.

8. A deep sea piston seawater pump according to claim 7, characterized in that: The guide belt and the seal arranged on the water side piston sleeve are both located between the scraping rings at both ends of the water side piston; the seal close to the scraping ring is a one-way seal, and the other seals are two-way seals.

9. A deep sea piston seawater pump according to claim 1, characterized in that: The oil-side cylinder comprises a cylinder bottom cover, a cylinder body and a connection cover which are fixedly connected in sequence, and the connection cover is fixedly connected to the water-side cylinder; the one-way valve is fixedly connected to the cylinder bottom cover and the connection cover.

10. A deep sea piston seawater pump according to claim 9, characterized in that: There are installation gaps between the installation end of the cylinder bottom cover and the port of the cylinder body, and between the installation end of the connecting cover and the port of the cylinder body; the one-way valve is connected with the stepped cavity through the installation gap.

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