Submersible reciprocating pump drive mechanism

Abstract

The present invention discloses a driving mechanism for a submersible reciprocating pump, which comprises a housing having first and second installation cavities. An oil-submersible motor is arranged in the first installation cavity. The oil-submersible motor is connected to a gear reduction mechanism, and the gear reduction mechanism is connected to a crankshaft connecting rod reciprocating motion mechanism. Lubricating oil is arranged in the first installation cavity. Pressure balance windows are opened at the upper and lower ends of the housing. Flexible diaphragms are arranged in the pressure balance windows, and filter nets are arranged outside the flexible diaphragms. A contact switch is arranged between the lower flexible diaphragm and the housing. A refueling joint and a conductivity probe that penetrate into the first installation cavity are fixedly installed on the housing. A junction box is arranged in the second installation cavity. The oil-submersible motor, the conductivity probe, and the contact switch are all connected to the junction box, and the second installation cavity is filled with insulating resin. The present invention can work underwater, has a wider application range, is highly sealed and waterproof as a whole and resistant to seawater corrosion, and at the same time has corresponding monitoring functions, and can complete efficient and stable operations underwater.

Description

Technical Field

[0001] The present invention relates to a driving mechanism for a submersible reciprocating pump. Background Art

[0002] Deep - sea mining and underwater operations require various submersible devices, and in some cases, high - pressure reciprocating pumps are needed.

[0003] Most of the existing reciprocating pump products are placed on land or offshore platforms. Parts such as crankshafts, connecting rods, and rolling bearings need to be lubricated by lubricating oil in the drive box, and the crankcase cannot enter underwater. In addition, common gear reduction boxes or belt pulleys cannot be placed underwater. Therefore, the working application range of this kind of reciprocating pump is relatively limited. In addition, the underwater working environment also poses higher requirements for the performance of the reciprocating pump, not only requiring high - sealing waterproof and corrosion resistance, but also requiring specific monitoring functions to ensure the efficient and stable operation of the reciprocating pump. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a driving mechanism for a submersible reciprocating pump, aiming to solve the technical problems existing in the prior art that traditional reciprocating pumps cannot be placed underwater for work, have a limited application range, do not have high - sealing waterproof, corrosion resistance, and corresponding monitoring functions, and cannot complete efficient and stable operations in underwater scenarios.

[0005] The technical solution of the present invention is: a driving mechanism for a submersible reciprocating pump, including a housing. The housing has a first installation cavity and a second installation cavity; a submersible oil motor is provided in the first installation cavity. The output end of the submersible oil motor is connected to a gear reduction mechanism, and the output end of the gear reduction mechanism is connected to a crankshaft - connecting rod reciprocating motion mechanism; lubricating oil is provided in the first installation cavity, and the submersible oil motor, the gear reduction mechanism, and the crankshaft - connecting rod reciprocating motion mechanism are all immersed in the lubricating oil; pressure - balancing windows communicating with the first installation cavity are respectively opened at the upper and lower ends of the housing. A flexible diaphragm for blocking the lubricating oil is provided in each pressure - balancing window, and a filter screen for preventing foreign objects from entering the pressure - balancing window is further provided outside the flexible diaphragm; a contact switch for detecting the oil level is provided between the flexible diaphragm in the lower - end pressure - balancing window and the housing. A refueling joint for replenishing lubricating oil and a conductivity probe for detecting whether water seeps into the first installation cavity are fixedly installed on the housing and penetrate into the first installation cavity; a junction box for receiving detection signals is provided in the second installation cavity. The submersible oil motor, the conductivity probe, and the contact switch are all connected to the junction box, and the second installation cavity is also filled with insulating resin.

[0006] Further, in the present invention, the gear reduction mechanism includes a high - speed gear shaft and a low - speed gear shaft. The high - speed gear shaft is connected to the output end of the submersible oil motor, and the low - speed gear shaft is meshed with the high - speed gear shaft.

[0007] Furthermore, in the present invention, the crankshaft connecting rod reciprocating motion mechanism includes a crankshaft, a crosshead connected to the crankshaft through a connecting rod, and a crosshead connecting rod fixedly connected to the other end of the crosshead. The crankshaft is connected to the low-speed gear shaft. A bellows is sleeved outside the crosshead connecting rod, and the bellows is hermetically connected to the machine housing.

[0008] Furthermore, in the present invention, there are multiple crosshead connecting rods, and each crosshead connecting rod is connected to the crankshaft through the crosshead and the connecting rod.

[0009] Furthermore, in the present invention, a spring is further provided between the flexible diaphragm at the lower end and the machine housing.

[0010] Furthermore, in the present invention, power electrical terminals, conductivity probe terminals, and oil level detection switch terminals respectively connected to the submersible motor, conductivity probe, and contact switch are provided on the junction box.

[0011] Furthermore, in the present invention, a junction box interface communicating with the second installation cavity is provided on the machine housing. A makeup oil pipe is connected to the makeup oil joint. The lead wires of each terminal on the junction box and the makeup oil pipe pass through the junction box interface and are bundled into a tube bundle.

[0012] Furthermore, in the present invention, both ends of the high-speed gear shaft and the crankshaft are connected to the machine housing through bearings, and the bearings are immersed in lubricating oil.

[0013] Furthermore, in the present invention, the machine housing is made of stainless steel material.

[0014] The present invention has the following advantages compared with the prior art:

[0015] 1) In the present invention, all the power parts of the reciprocating pump are integrated into one body. After being sealed, it can work underwater, with a wider application range. The machine housing is made of stainless steel material, with overall high sealing and waterproof performance and seawater corrosion resistance. When operating underwater, seawater can also be used to provide water cooling for the machine housing.

[0016] 2) In the present invention, a submersible motor is used for the motor. Since water can cool the motor, the fan blades on the rotor are omitted, reducing the oil stirring loss.

[0017] 3) In the present invention, the submersible motor, gear reduction mechanism, crankshaft connecting rod reciprocating motion mechanism, bearings, etc. are all immersed in lubricating oil and do not contact seawater, avoiding being corroded by seawater.

[0018] 4) In the present invention, the part of the crosshead connecting rod extending out of the machine housing makes a reciprocating motion. The outside of the moving part is wrapped with a bellows and hermetically connected to the machine housing. The bellows is a static seal elastic element, which can prevent the mixing of oil and water during the telescopic process.

[0019] 5) In the present invention, both the upper and lower pressure balance windows are sealed with flexible diaphragms. The lubricating oil inside the casing is isolated from the seawater outside the casing by the flexible diaphragms. Based on the principle that the liquid pressure makes the pressures inside and outside the flexible diaphragms equal, the pressures inside and outside the casing are kept balanced, and the oil and water do not mix.

[0020] 6) In the present invention, a layer of filter screen is installed outside the flexible diaphragm to prevent aquatic organisms from attaching to the diaphragm and affecting the free bending of the diaphragm.

[0021] 7) In the present invention, a set of oil level control mechanism is designed at the pressure balance window near the junction box at the lower end. The contact switch is used to detect whether the oil quantity inside the casing is appropriate. When the flexible diaphragm presses the contact, it indicates that lubricating oil needs to be replenished, and the oil replenishment operation can be carried out externally through the oil replenishment joint.

[0022] 8) In the present invention, by installing a spring between the lower flexible diaphragm and the casing, the resilience hardness and damping of the diaphragm can be appropriately increased to avoid false alarms caused by the influence of the machine movement.

[0023] 9) In the present invention, by setting up a conductivity probe, it can be detected whether there is water infiltration inside the casing, and a detection signal is output to the water surface in time.

[0024] 10) In the present invention, the junction box can receive and process various detection signals. After the lead wires of each terminal on the junction box and the oil replenishment pipe for replenishing lubricating oil are all led out from the junction box interface, they are tied into a bundle and led out of the water surface. Then, the second installation cavity is insulated and sealed by pouring insulating resin. While realizing the monitoring function, it can ensure that the reciprocating pump completes efficient and stable operation underwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present invention.

[0026] Wherein: 1, casing; 1A, first installation cavity; 1B, second installation cavity; 2, submersible motor; 3, gear reduction mechanism; 31, high-speed gear shaft; 32, low-speed gear shaft; 4, crankshaft connecting rod reciprocating motion mechanism; 41, crankshaft; 42, connecting rod; 43, crosshead; 44, crosshead connecting rod; 5, lubricating oil; 6, pressure balance window; 7, flexible diaphragm; 8, filter screen; 9, bellows; 10, contact switch; 11, spring; 12, oil replenishment joint; 13, conductivity probe; 14, junction box; 141, power supply terminal; 142, conductivity probe terminal; 143, oil level detection switch terminal; 15, junction box interface; 16, bundle; 17, bearing. DETAILED DESCRIPTION OF THE INVENTION

[0027] The following specifically describes the specific embodiments of the present invention with reference to the accompanying drawings.

[0028] Embodiment:

[0029] The specific implementation manner of a driving mechanism of a submersible reciprocating pump according to the present invention is shown in combination with the accompanying drawings, which mainly includes a housing 1 made of stainless steel material. The housing 1 has a first installation cavity 1A and a second installation cavity 1B inside.

[0030] A submersible oil motor 2 is provided in the first installation cavity 1A. The output end of the submersible oil motor 2 is connected to a gear reduction mechanism 3, and the output end of the gear reduction mechanism 3 is connected to a crankshaft connecting rod reciprocating motion mechanism 4. Lubricating oil 5 is provided in the first installation cavity 1A, and the submersible oil motor 2, the gear reduction mechanism 3, and the crankshaft connecting rod reciprocating motion mechanism 4 are all immersed in the lubricating oil 5.

[0031] Specifically, the gear reduction mechanism 3 includes a high-speed gear shaft 31 and a low-speed gear shaft 32. The high-speed gear shaft 31 is connected to the output end of the submersible oil motor 2, and the low-speed gear shaft 32 is meshed and connected to the high-speed gear shaft 31.

[0032] The crankshaft connecting rod reciprocating motion mechanism 4 includes a crankshaft 41, three crossheads 43 respectively connected to the crankshaft 41 through connecting rods 42, and three crosshead connecting rods 44 respectively fixedly connected to the other ends of the three crossheads 43. The crankshaft 41 is connected to the low-speed gear shaft 32, and finally drives the crosshead connecting rods 44 to reciprocate. A bellows 9 is respectively sleeved outside each crosshead connecting rod 44. The bellows 9 is hermetically connected to the housing 1. The part of the crosshead connecting rod 44 extending out of the housing 1 makes a reciprocating motion. The bellows 9 wrapped outside the moving part is a static sealing elastic element, which can prevent the mixing of oil and water during the telescopic process.

[0033] In this embodiment, both ends of the high-speed gear shaft 31 and the crankshaft 41 are connected to the housing 1 through bearings 17, and the bearings 17 are also immersed in the lubricating oil 5.

[0034] Pressure balance windows 6 communicating with the first installation cavity 1A are respectively opened at the upper and lower ends of the housing 1. A flexible diaphragm 7 for blocking the lubricating oil 5 is provided in each pressure balance window 6, and a filter screen 8 for preventing foreign objects from entering the pressure balance window 6 is further provided outside the flexible diaphragm 7. The lubricating oil 5 inside the housing 1 is isolated from the seawater outside the housing 1 by the flexible diaphragm 7. By using the principle that the pressures inside and outside the flexible diaphragm 7 are equal due to liquid pressure, the pressures inside and outside the housing 1 are kept balanced, and the oil and water do not mix. The filter screen 8 installed outside the flexible diaphragm 7 can prevent aquatic organisms from attaching to the diaphragm and affecting the free bending of the diaphragm.

[0035] A contact switch 10 for detecting the oil level is provided between the flexible diaphragm 7 in the lower pressure balance window 6 and the housing 1. A spring 11 is also provided between the flexible diaphragm 7 and the housing 1. The contact switch 10 can be used to detect whether the oil quantity in the housing 1 is appropriate. When the flexible diaphragm 7 presses the contact, it indicates that lubricating oil 5 needs to be replenished. The spring 11 can appropriately increase the rebound hardness and damping of the diaphragm to avoid false alarms caused by the influence of machine movement.

[0036] A oil replenishing joint 12 for replenishing lubricating oil 5 and penetrating into the first installation cavity 1A and a conductivity probe 13 for detecting whether water seeps into the first installation cavity 1A are fixedly installed on the housing 1.

[0037] Furthermore, a junction box 14 for receiving detection signals is provided in the second installation cavity 1B. The junction box 14 is provided with a power supply terminal 141, a conductivity probe terminal 142, and an oil level detection switch terminal 143, which are respectively connected to the submersible motor 2, the conductivity probe 13, and the contact switch 10. The conductivity probe 13 can timely detect whether water seeps into the housing 1, send the signal to the junction box 14, and output the detection signal to the water surface. After the contact switch 10 is triggered, it can send a detection signal to the junction box 14 and prompt that the oil quantity in the housing 1 is insufficient to the water surface. The oil can be replenished externally through the oil replenishing joint 12.

[0038] A junction box interface 15 communicating with the second installation cavity 1B is further provided at the bottom of the housing 1. An oil replenishing pipe is connected to the oil replenishing joint 12. When the oil quantity in the housing 1 is insufficient, the lubricating oil 5 can be replenished through the oil replenishing pipe and the oil replenishing joint 12. The lead wires of each terminal on the junction box 14 and the oil replenishing pipe pass through the junction box interface 15 and are bundled into a cable bundle 16 and led out of the water surface. Insulating resin is also filled in the second installation cavity 1B to play an insulating and sealing role, enabling efficient and stable operation of the reciprocating pump underwater while realizing the monitoring function.

[0039] All the power parts of the reciprocating pump of the present invention are integrated into one body, and can be placed underwater after being sealed, with a wider application range. The housing 1 is made of stainless steel material, which is highly sealed and waterproof and resistant to seawater corrosion. When operating underwater, seawater can also be used to provide water cooling for the housing 1. The motor uses a submersible motor 2. Since water can cool the motor, the fan blades on the rotor are omitted, reducing the oil stirring loss. The submersible motor 2, the gear reduction mechanism 3, the crankshaft connecting rod reciprocating motion mechanism 4, the bearing 17, etc. are all immersed in the lubricating oil 5 and do not contact seawater, which can avoid being corroded by seawater. At the same time, corresponding monitoring functions are also provided, such as water seepage monitoring, oil level monitoring, etc., enabling efficient and stable operation underwater.

[0040] Certainly, the above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. All modifications made according to the spirit and essence of the main technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

1. A driving mechanism for a submersible reciprocating pump, characterized in that: It includes a housing (1), and a first installation cavity (1A) and a second installation cavity (1B) are provided inside the housing (1); A submersible motor (2) is provided in the first installation cavity (1A). The output end of the submersible motor (2) is connected to a gear reduction mechanism (3), and the output end of the gear reduction mechanism (3) is connected to a crankshaft connecting rod reciprocating motion mechanism (4); Lubricating oil (5) is provided in the first installation cavity (1A), and the submersible motor (2), the gear reduction mechanism (3), and the crankshaft connecting rod reciprocating motion mechanism (4) are all immersed in the lubricating oil (5); Pressure balance windows (6) communicating with the first installation cavity (1A) are respectively opened at the upper and lower ends of the housing (1). A flexible diaphragm (7) for blocking the lubricating oil (5) is provided in each pressure balance window (6), and a filter screen (8) for preventing foreign objects from entering the pressure balance window (6) is further provided outside the flexible diaphragm (7); A contact switch (10) for detecting the oil level is provided between the flexible diaphragm (7) in the lower pressure balance window (6) and the housing (1). A refueling joint (12) for supplementing the lubricating oil (5) and penetrating into the first installation cavity (1A) and a conductivity probe (13) for detecting whether water seeps into the first installation cavity (1A) are also fixedly installed on the housing (1); A junction box (14) for receiving detection signals is provided in the second installation cavity (1B). The submersible motor (2), the conductivity probe (13), and the contact switch (10) are all connected to the junction box (14), and insulating resin is also filled in the second installation cavity (1B).

2. The diving reciprocating pump drive mechanism according to claim 1, characterized in that: The gear reduction mechanism (3) includes a high-speed gear shaft (31) and a low-speed gear shaft (32). The high-speed gear shaft (31) is connected to the output end of the submersible motor (2), and the low-speed gear shaft (32) is meshed and connected to the high-speed gear shaft (31).

3. The diving reciprocating pump driving mechanism according to claim 2, characterized in that: The crankshaft connecting rod reciprocating motion mechanism (4) includes a crankshaft (41), a crosshead (43) connected to the crankshaft (41) through a connecting rod (42), and a crosshead connecting rod (44) fixedly connected to the other end of the crosshead (43). The crankshaft (41) is connected to the low-speed gear shaft (32). A corrugated pipe (9) is further sleeved outside the crosshead connecting rod (44), and the corrugated pipe (9) is hermetically connected to the housing (1).

4. The diving reciprocating pump driving mechanism according to claim 3, characterized in that: There are multiple crosshead connecting rods (44), and each crosshead connecting rod (44) is connected to the crankshaft (41) through the crosshead (43) and the connecting rod (42).

5. The diving reciprocating pump drive mechanism according to claim 1, wherein: A spring (11) is further provided between the flexible diaphragm (7) at the lower end and the housing (1).

6. The diving reciprocating pump driving mechanism according to claim 1, characterized in that: Power terminals (141), conductivity probe terminals (142), and oil level detection switch terminals (143) respectively connected to the submersible motor (2), the conductivity probe (13), and the contact switch (10) are provided on the junction box (14).

7. The diving reciprocating pump drive mechanism according to claim 6, wherein: A junction box interface (15) communicating with the second installation cavity (1B) is provided on the housing (1). A refueling pipe is connected to the refueling joint (12), and the lead-out wires of the terminals on the junction box (14) and the refueling pipe pass through the junction box interface (15) and are bundled into a cable bundle (16).

8. The diving reciprocating pump driving mechanism according to claim 3, characterized in that: Both ends of the high-speed gear shaft (31) and the crankshaft (41) are connected to the housing (1) through bearings (17), and the bearings (17) are immersed in the lubricating oil (5).

9. The diving reciprocating pump driving mechanism according to claim 1, characterized in that: The housing (1) is made of stainless steel material.

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