Steam reciprocating pump

Abstract

The invention provides a steam reciprocating pump, and belongs to the field of marine pumps. The steam reciprocating pump comprises a cylinder, a steam distribution assembly, a hydraulic cylinder and a pump valve assembly. The air cylinder comprises an air cylinder body and a steam-driven piston, and the steam-driven piston is movably located in the air cylinder body. The steam distribution assembly is located outside the cylinder body and connected with the cylinder body, the hydraulic cylinder comprises a hydraulic cylinder body and a hydraulic piston, the hydraulic piston is movably located in the hydraulic cylinder body, and the hydraulic piston is coaxially connected with the steam-driven piston; the pump valve assembly is located outside the hydraulic cylinder and comprises a pump shell and two valve control unit sets, two containing cavities are formed in the pump shell, and the two valve control unit sets are located in the two containing cavities respectively. The flow of the liquid cargo pumped by the steam reciprocating pump can be increased, so that the working efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the field of marine pumps, and in particular relates to a steam reciprocating pump. Background Art

[0002] Steam reciprocating pumps are often used on various engineering ships for medium transportation or tank stripping operations.

[0003] In the related art, a steam reciprocating pump includes a steam distribution assembly, a cylinder, a liquid cylinder and a pump-valve assembly. The steam distribution assembly is connected to the cylinder, and the steam distribution assembly is used to distribute steam or exhaust steam to the rodless chamber or the rod chamber in the cylinder, so that the pneumatic piston in the cylinder can reciprocate. The hydraulic piston of the liquid cylinder is connected to the pneumatic piston of the cylinder. When the pneumatic piston reciprocates, the hydraulic piston also reciprocates. The pump-valve assembly is connected to the rod chamber of the liquid cylinder, and is used to move the hydraulic piston of the liquid cylinder toward the liquid cylinder body of the liquid cylinder to suck the liquid cargo into the pump-valve assembly, and when the hydraulic piston shrinks back into the liquid cylinder body, the liquid cargo is pumped out of the pump-valve assembly to realize medium transportation or tank sweeping and other operations.

[0004] However, since the pump-valve assembly is connected to the rod chamber of the hydraulic cylinder, the pump-valve assembly can pump liquid cargo only when the hydraulic piston contracts back into the hydraulic cylinder body, resulting in a low volume of liquid cargo pumped per unit time, which cannot meet the high-efficiency and high-flow operation requirements. Summary of the invention

[0005] The embodiment of the present disclosure provides a steam reciprocating pump, which can increase the flow rate of liquid cargo pumped by the steam reciprocating pump and improve the operation efficiency. The technical solution is as follows:

[0006] The embodiment of the present disclosure provides a steam reciprocating pump, which includes a cylinder, a steam distribution component, a liquid cylinder and a pump-valve component; the cylinder includes a cylinder body and a pneumatic piston, and the pneumatic piston is movably located in the cylinder body; the steam distribution component is located outside the cylinder body and is connected to the cylinder body, and the steam distribution component is used to drive the pneumatic piston to move; the liquid cylinder includes a liquid cylinder body and a liquid piston, and the liquid piston is movably located in the liquid cylinder body, and the liquid piston is coaxially connected to the pneumatic piston; the pump-valve component is located outside the liquid cylinder, and the pump-valve component includes a pump housing and two valve control unit groups, and the corresponding parts of the pump housing are connected to the liquid cylinder body. There are respectively a suction port and a discharge port on both sides, and two accommodating chambers are arranged inside the pump housing, and the two accommodating chambers are respectively connected to the rod chamber and the rodless chamber of the liquid cylinder; the two valve control unit groups are respectively located in the two accommodating chambers, and each of the two valve control unit groups includes at least one valve control unit; the valve control unit is used to pump out the liquid in the accommodating chamber from the discharge port when the pressure in the accommodating chamber is greater than the pressure of the discharge port, and to suck the liquid from the suction port into the accommodating chamber when the pressure in the accommodating chamber is less than the pressure of the suction port.

[0007] In another embodiment of the present disclosure, the valve control unit includes an intake valve and an exhaust valve, both of which are connected to the pump housing; the first oil port of the intake valve is connected to the suction port, the second oil port of the intake valve is connected to the accommodating chamber, and the intake valve is configured so that when the pressure at its first oil port is greater than the pressure at its second oil port, its first oil port is connected to its second oil port; the first oil port of the exhaust valve is connected to the accommodating chamber, the second oil port of the exhaust valve is connected to the exhaust port, and the exhaust valve is configured so that when the pressure at its first oil port is greater than the pressure at its second oil port, its first oil port is connected to its second oil port.

[0008] In yet another implementation of the present disclosure, the suction valve and the discharge valve have the same structure and are both one-way flow valves.

[0009] In another implementation of the present disclosure, the two accommodating chambers include a first accommodating chamber and a second accommodating chamber; the pump housing also has a first discharge channel, a first suction channel, a second discharge channel and a second suction channel; the first discharge channel and the second discharge channel are both connected to the discharge port, and the first suction channel and the second suction channel are both connected to the suction port; the first discharge channel and the first suction channel are respectively located on opposite sides of the first accommodating chamber along the movement direction of the hydraulic piston, the first discharge channel is connected to the second oil port of the discharge valve located in the first accommodating chamber, and the first suction channel is connected to the first oil port of the suction valve located in the first accommodating chamber; the second discharge channel and the second suction channel are respectively located on opposite sides of the second accommodating chamber along the movement direction of the hydraulic piston, the second discharge channel is connected to the second oil port of the discharge valve located in the second accommodating chamber, and the second suction channel is connected to the first oil port of the suction valve located in the second accommodating chamber.

[0010] In another implementation of the present disclosure, there are two liquid cylinders, which are arranged side by side and connected along a direction perpendicular to the movement direction of the liquid piston; there are two pneumatic cylinders, which are connected side by side and correspond one to one to the two liquid cylinders, and the liquid piston of the liquid cylinder is coaxially connected to the pneumatic piston of the corresponding cylinder; the pneumatic distribution assembly is connected to the two cylinders, and the pneumatic distribution assembly is used to drive the pneumatic pistons in the two cylinders to move in turn.

[0011] In another implementation of the present disclosure, the steam distribution assembly includes two steam distribution units, the two steam distribution units are arranged in a one-to-one correspondence with the two cylinders, and each of the two steam distribution units is connected to the corresponding cylinder; each of the two steam distribution units includes a steam distribution valve body and a steam distribution valve core, the steam distribution valve bodies of the two steam distribution units are connected, and the two steam distribution valve bodies have a steam inlet; the steam distribution valve core is movably located in the steam distribution valve body, and the steam distribution valve core has a first position and a second position along the moving direction of the steam-driven piston, and the steam distribution valve core is configured as: when the steam distribution valve core is in the first position, the steam is controlled to enter the rodless chamber of the corresponding cylinder, and the steam in the rod chamber of the corresponding cylinder is discharged to drive the steam-driven piston to move; when the steam distribution valve core is in the second position, the steam is controlled to enter the rod chamber of the corresponding cylinder, and the steam in the rodless chamber of the corresponding cylinder is discharged to drive the steam-driven piston to move.

[0012] In another implementation of the present disclosure, the interior of the steam distribution valve body has a first steam inlet channel, a first steam exhaust channel, an exhaust port, a second steam exhaust channel and a second steam inlet channel arranged at intervals along the moving direction of the steam-driven piston; the first steam inlet channel and the first steam exhaust channel are both connected to the rodless chamber of the cylinder corresponding to the steam distribution unit, and the second steam exhaust channel and the second steam inlet channel are both connected to the rod chamber of the cylinder corresponding to the steam distribution unit; when the steam distribution valve core is in the first position, the first steam inlet channel is connected to the steam inlet port, and the second steam exhaust channel is connected to the exhaust port; when the steam distribution valve core is in the second position, the second steam inlet channel is connected to the steam inlet port, and the first steam exhaust channel is connected to the exhaust port.

[0013] In another implementation of the present disclosure, the two steam distribution units include a first steam distribution unit and a second steam distribution unit, the two cylinders include a first cylinder and a second cylinder, the first steam distribution unit is correspondingly connected to the first cylinder, and the second steam distribution unit is correspondingly connected to the second cylinder; the steam reciprocating pump also includes a connecting rod assembly, and the connecting rod assembly includes a first connecting unit and a second connecting unit; the first connecting unit is respectively connected to the steam-driven piston in the first cylinder and the steam distribution valve core in the second steam distribution unit, and the second connecting unit is respectively connected to the steam distribution valve core in the first steam distribution unit and the steam-driven piston in the second cylinder; the first connecting unit is configured to: control the connected steam-driven piston and the steam distribution valve core to move in opposite directions, and the second connecting unit is configured to: control the connected steam-driven piston and the steam distribution valve core to move in the same direction.

[0014] In another embodiment of the present invention, the connecting unit includes a connecting head, a rotating pin, a rocker arm, a rocker arm shaft, a rocker and a connecting rod; the connecting head is respectively connected to the pneumatic piston of the cylinder and the hydraulic piston of the liquid cylinder; the rotating pin is inserted into the outer wall of the connecting head and is rotatably connected to the connecting head, and the axial direction of the rotating shaft of the rotating pin is perpendicular to the moving direction of the pneumatic piston; the first end of the rocker arm is slidably inserted into the rotating pin, and the moving direction of the rocker arm relative to the rotating pin is perpendicular to the extending direction of the rotating axis of the rotating pin, the second end of the rocker arm is rotatably connected to one end of the rocker arm shaft, the middle part of the rocker arm shaft is rotatably connected to the steam valve body, the rocker arm shaft is parallel to the rotating pin, and the other end of the rocker arm shaft is connected to the rocker arm shaft. One end of the rod is rotatably connected, the rocker arm is perpendicular to the rocker arm shaft, the other end of the rocker arm is hinged to the connecting rod, and the other end of the connecting rod is connected to the steam valve core; the rocker arm and the rocker arm in the first connecting unit are respectively located on both sides of the axial direction of the connected rocker arm shaft, and when the steam valve core in the second steam distribution unit is in the upper limit position, the rocker arm, the rocker arm and the rocker arm shaft in the first connecting unit are located in the same plane; the rocker arm and the rocker arm in the second connecting unit are respectively located on the same side of the axial direction of the connected rocker arm shaft, and when the steam valve core in the first steam distribution unit is in the lower limit position, the rocker arm, the rocker arm and the rocker arm shaft in the second connecting unit are located in the same plane.

[0015] In another embodiment of the present disclosure, the steam reciprocating pump also includes a support assembly, which includes at least two support columns, the at least two support columns are parallel to each other, and one end of each of the at least two support columns is connected to the cylinder body, and the other end of each of the support columns is connected to the liquid cylinder body.

[0016] The technical solution provided by the embodiments of the present disclosure brings the following beneficial effects:

[0017] Since the pump housing has two accommodating chambers inside, and one of the two accommodating chambers is correspondingly connected to the rodless chamber of the liquid cylinder, and the other of the two accommodating chambers is correspondingly connected to the rod chamber of the liquid cylinder, when the hydraulic piston of the liquid cylinder moves toward the outside of the liquid cylinder body, the hydraulic pressure of the accommodating chamber connected to the rod chamber of the liquid cylinder increases, and the hydraulic pressure of the accommodating chamber connected to the rodless chamber of the liquid cylinder decreases. The hydraulic pressure inside the multiple valve control units located in the accommodating chamber connected to the rod chamber of the liquid cylinder increases, and the valve control units can pump the liquid cargo in the accommodating chamber from the discharge port. The hydraulic pressure inside the multiple valve control units located in the accommodating chamber connected to the rodless chamber of the liquid cylinder decreases, and the valve control units can suck the liquid cargo from the suction port into the accommodating chamber. When the hydraulic piston of the liquid cylinder retracts into the liquid cylinder body, the hydraulic pressure of the accommodating chamber connected to the rod chamber of the liquid cylinder decreases, and the hydraulic pressure of the accommodating chamber connected to the rodless chamber of the liquid cylinder increases. The hydraulic pressure inside the multiple valve control units located in the accommodating chamber connected to the rod chamber of the liquid cylinder is reduced, and the valve control units can suck the liquid cargo from the suction port into the accommodating chamber. The hydraulic pressure inside the multiple valve control units located in the accommodating chamber connected to the rodless chamber of the liquid cylinder is reduced, and the valve control units can pump the liquid cargo in the accommodating chamber out of the discharge port.

[0018] Therefore, no matter when the hydraulic piston of the hydraulic cylinder is extended or retracted, the pump valve assembly can synchronously suck in and pump out liquid cargo, thereby increasing the volume of liquid cargo pumped per unit time and thus improving operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a schematic structural diagram of a steam reciprocating pump provided in an embodiment of the present disclosure;

[0021] Figure 2 yes Figure 1 The cross-sectional view along the AA direction;

[0022] Figure 3 yes Figure 2 Cross-sectional view along CC direction;

[0023] Figure 4 yes Figure 2 The cross-sectional view along the BB direction;

[0024] Figure 5 yes Figure 2 The cross-sectional view along the DD direction;

[0025] Figure 6 It is a structural diagram of the connected components.

[0026] The symbols in the figure mean the following:

[0027] 1. Cylinder; 1a. First cylinder; 1b. Second cylinder; 11. Cylinder body; 12. Pneumatic piston; 13. Pneumatic piston rod;

[0028] 2. Steam distribution assembly; 20. Steam distribution unit; 20a. First steam distribution unit; 20b. Second steam distribution unit; 201. Steam inlet; 20. Steam distribution unit; 21. Steam distribution valve body; 22. Steam distribution valve core; 221. Valve core shaft; 222. Valve core sleeve; 2101. First steam inlet channel; 2102. First steam exhaust channel; 2103. Steam exhaust port; 2104. Second steam exhaust channel; 2105. Second steam inlet channel; 2220. Annular groove; 202. First annular through groove; 203. Second annular through groove;

[0029] 4. Liquid cylinder; 4a. First liquid cylinder; 4b. Second liquid cylinder; 41. Liquid cylinder body; 42. Liquid piston; 43. Liquid piston rod;

[0030] 5. Pump valve assembly; 500. Accommodation chamber; 501. First accommodation chamber; 502. Second accommodation chamber; 503. First liquid discharge channel; 504. First liquid suction channel; 505. Second liquid discharge channel; 506. Second liquid suction channel; 51. Pump housing; 52. Valve control unit group; 5101. Liquid suction port; 5102. Liquid discharge port; 520. Valve control unit; 521. Intake valve; 522. Discharge valve;

[0031] 6. Connecting rod assembly; 60. Connecting unit; 601. First connecting unit; 602. Second connecting unit; 61. Connecting head; 62. Rotating pin; 620. Square hole; 63. Rocker arm; 631. U-shaped head; 632. Connecting rod; 64. Rocker arm shaft; 65. Rocker; 66. Connecting rod;

[0032] 7. Support assembly; 71. Support column; 72. Connecting plate. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0034] The present disclosure provides a steam reciprocating pump, such as Figure 1 As shown, the steam reciprocating pump includes a cylinder 1, a steam distribution component 2, a liquid cylinder 4 and a pump valve component 5.

[0035] Figure 2 yes Figure 1 The cross-sectional view along the AA direction, combined with Figure 2 The cylinder 1 comprises a cylinder body 11, a pneumatic piston 12 and a pneumatic piston rod 13. The pneumatic piston 12 is movably located in the cylinder body 11. One end of the pneumatic piston rod 13 is connected to the pneumatic piston 12.

[0036] The steam distribution component 2 is located outside the cylinder body 11 and is connected to the cylinder body 11. The steam distribution component 2 is used to drive the steam piston 12 to move.

[0037] The hydraulic cylinder 4 includes a hydraulic cylinder body 41, a hydraulic piston 42 and a hydraulic piston rod 43. The hydraulic piston 42 is movably located in the hydraulic cylinder body 41. One end of the hydraulic piston rod 43 is connected to the hydraulic piston 42, and the other end of the hydraulic piston rod 43 is coaxially connected to the other end of the pneumatic piston rod 13. In this way, when the pneumatic piston 12 moves, it can drive the hydraulic piston 42 to move synchronously.

[0038] Figure 3 yes Figure 2 The cross-sectional view along the CC direction, combined with Figure 3 The pump valve assembly 5 is located outside the liquid cylinder 4. The pump valve assembly 5 includes a pump housing 51 and two valve control unit groups 52. The pump housing 51 has a liquid suction port 5101 and a liquid discharge port 5102 on opposite sides. The pump housing 51 has two accommodating chambers 500 inside. The two accommodating chambers 500 are respectively connected to the rod chamber and the rodless chamber of the liquid cylinder 4. The two valve control unit groups 52 are respectively located in the two accommodating chambers 500. Each of the two valve control unit groups 52 includes at least one valve control unit 520.

[0039] The valve control unit 520 is used to pump out the liquid cargo in the accommodating chamber 500 from the discharge port 5102 when the pressure in the accommodating chamber 500 is greater than the pressure in the discharge port 5102, and to suck the liquid cargo into the accommodating chamber 500 from the suction port 5101 when the pressure in the accommodating chamber 500 is less than the pressure in the suction port 5101.

[0040] When the steam reciprocating pump provided by the embodiment of the present disclosure is used to transport liquid cargo or to perform a tank sweeping operation through liquid cargo, since the steam reciprocating pump includes a cylinder 1, a steam distribution assembly 2, a liquid cylinder 4, and the liquid piston 42 is coaxial with the gas piston 12, the liquid piston 42 can be driven to move synchronously by the gas piston 12. The steam distribution assembly 2 is used to drive the gas piston 12 to move, so that the steam can enter the rod chamber or the rodless chamber of the cylinder 1 through the steam distribution assembly 2, and at the same time, the steam is discharged from the rodless chamber or the rod chamber of the cylinder 1 to drive the gas piston 12 to reciprocate, thereby driving the liquid piston 42 to reciprocate synchronously.

[0041] Since the pump housing 51 has two accommodating chambers 500 inside, and one of the two accommodating chambers 500 is correspondingly connected to the rodless chamber of the liquid cylinder 4, and the other of the two accommodating chambers 500 is correspondingly connected to the rod chamber, when the hydraulic piston 42 of the liquid cylinder 4 moves toward the outside of the liquid cylinder body 41, the hydraulic pressure of one of the accommodating chambers 500 connected to the rod chamber of the liquid cylinder 4 increases, and the hydraulic pressure of the other accommodating chamber 500 connected to the rodless chamber of the liquid cylinder 4 decreases. The hydraulic pressure inside the multiple valve control units 520 located in the accommodating chamber 500 connected to the rod chamber of the liquid cylinder increases, and the valve control units 520 can pump the liquid cargo in the accommodating chamber 500 from the discharge port 5102. The hydraulic pressure inside the multiple valve control units 520 located in the accommodating chamber 500 connected to the rodless chamber of the liquid cylinder decreases, and the valve control units 520 can suck the liquid cargo from the suction port 5101 into the accommodating chamber 500. When the hydraulic piston 42 of the liquid cylinder 4 retracts the liquid cylinder body 41, the hydraulic pressure of one of the accommodating chambers 500 connected to the rod chamber of the liquid cylinder 4 decreases, and the hydraulic pressure of the other accommodating chamber 500 connected to the rodless chamber of the liquid cylinder 4 increases. The hydraulic pressure inside the multiple valve control units 520 located in the accommodating chamber 500 connected to the rod chamber of the liquid cylinder decreases, and the valve control units 520 can suck the liquid cargo from the suction port 5101 into the accommodating chamber 500. The hydraulic pressure inside the multiple valve control units 520 located in the accommodating chamber 500 connected to the rodless chamber of the liquid cylinder decreases, and the valve control units 520 can pump the liquid cargo in the accommodating chamber 500 from the discharge port 5102.

[0042] Therefore, no matter when the hydraulic piston 42 of the hydraulic cylinder 4 is extended or retracted, the pump valve assembly 5 can synchronously suck in and pump out the liquid cargo, thereby increasing the volume of the liquid cargo pumped per unit time, thereby improving the working efficiency.

[0043] Combination Figure 3 Optionally, the valve control unit 520 includes a suction valve 521 and a discharge valve 522, and the suction valve 521 and the discharge valve 522 are both connected to the pump housing 51. The first oil port of the suction valve 521 is connected to the suction port 5101, and the second oil port of the suction valve 521 is connected to the accommodating chamber 500. The suction valve 521 is configured such that when the pressure at its first oil port is greater than the pressure at its second oil port, its first oil port is connected to its second oil port.

[0044] The first oil port of the discharge valve 522 is connected to the accommodating chamber 500, and the second oil port of the discharge valve 522 is connected to the discharge port 5102. The discharge valve 522 is configured so that when the pressure at its first oil port is greater than the pressure at its second oil port, its first oil port is connected to its second oil port.

[0045] In the above implementation, the suction valve 521 is used to selectively connect the first oil port and the second oil port according to the pressure difference between the first oil port and the second oil port, so that the valve control unit 520 can inhale liquid cargo from the suction port 5101. The discharge valve 522 is used to selectively connect the first oil port and the second oil port according to the pressure difference between the first oil port and the second oil port, so that the valve control unit 520 can pump liquid cargo from the discharge port 5102.

[0046] In this embodiment, the suction valve 521 and the discharge valve 522 have the same structure and are both one-way flow valves, that is, they are in a conducting state when the pressure of the first oil port is greater than the pressure of the second oil port, and they are in a disconnected state when the pressure of the first oil port is not greater than the pressure of the second oil port.

[0047] Optionally, the two accommodating chambers 500 include a first accommodating chamber 501 and a second accommodating chamber 502. The pump housing 51 further has a first discharge channel 503, a first suction channel 504, a second discharge channel 505 and a second suction channel 506. The first discharge channel 503 and the second discharge channel 505 are both connected to the discharge port 5102, and the first suction channel 504 and the second suction channel 506 are both connected to the suction port 5101. The first discharge channel 503 and the first suction channel 504 are respectively located on opposite sides of the first accommodating chamber 501 along the movement direction of the hydraulic piston 42, the first discharge channel 503 is connected to the second oil port of the discharge valve 522 located in the first accommodating chamber 501, and the first suction channel 504 is connected to the first oil port of the suction valve 521 located in the first accommodating chamber 501. The second discharge channel 505 and the second suction channel 506 are respectively located on opposite sides of the second accommodating chamber 502 along the movement direction of the hydraulic piston 42. The second discharge channel 505 is connected to the second oil port of the discharge valve 522 located in the second accommodating chamber 502, and the second suction channel 506 is connected to the first oil port of the suction valve 521 located in the second accommodating chamber 502.

[0048] In the above implementation, the first discharge channel 503 is used to connect the second oil ports of all the discharge valves 522 in the first accommodating chamber 501 with the discharge port 5102. The first suction channel 504 is used to connect the first oil ports of all the suction valves 521 in the first accommodating chamber 501 with the suction port 5101.

[0049] The second discharge channel 505 is used to connect the second oil ports of all the discharge valves 522 in the second accommodating chamber 502 with the discharge port 5102. The second suction channel 506 is used to connect the first oil ports of all the suction valves 521 in the second accommodating chamber 502 with the suction port 5101.

[0050] Figure 4 yes Figure 2 The cross-sectional view along the BB direction, combined with Figure 4 Optionally, there are two liquid cylinders 4, and the two liquid cylinders 4 are connected side by side in a direction perpendicular to the movement direction of the liquid piston 42. There are two gas cylinders 1, and the two cylinders 1 are connected side by side and correspond to the two liquid cylinders 4 one by one. The liquid piston 42 of each liquid cylinder 4 is connected to the gas piston 12 of the corresponding cylinder 1. The rod chamber and the rodless chamber of each liquid cylinder 4 are respectively connected to the two accommodating chambers 500. The gas distribution assembly 2 is used to drive the gas pistons 12 in the two cylinders 1 to move in the same direction in turn.

[0051] In this embodiment, the two cylinders 1 include a first cylinder 1a and a second cylinder 1b. The two liquid cylinders 4 include a first liquid cylinder 4a and a second liquid cylinder 4b.

[0052] In the above implementation, since the steam distribution assembly 2 is used to drive the pneumatic pistons 12 in the two cylinders 1 to move in the same direction in turn, when the pneumatic piston 12 in the first cylinder 1a moves to the limit position, the pneumatic piston 12 in the second cylinder 1b starts to move, and thus, the hydraulic pistons 42 also move in turn. That is, the hydraulic piston 42 in the first hydraulic cylinder 4a moves to the limit position (for example, Figure 4 After the upper limit position or the lower limit position is reached (as shown in the figure), the hydraulic piston 42 of the second hydraulic cylinder 4b starts to move. Compared with the action of one hydraulic cylinder 4, the alternating movement of the two hydraulic cylinders 4 can significantly prolong the opening time of the suction valve 521 or the discharge valve 522 in each accommodating chamber 500, improve the stability of liquid cargo transportation, and reduce the number of opening and closing times of the suction valve 521 or the discharge valve 522, so as to prolong the service life of the suction valve 521 or the discharge valve 522.

[0053] Optionally, the steam distribution assembly 2 includes two steam distribution units 20, the two steam distribution units 20 are arranged in one-to-one correspondence with the two cylinders 1, and each of the two steam distribution units 20 is connected to the corresponding cylinder 1. Each steam distribution unit 20 includes a steam distribution valve body 21 and a steam distribution valve core 22, the steam distribution valve bodies 21 of the two steam distribution units 20 are connected, and the two steam distribution valve bodies 21 have a steam inlet 201.

[0054] The steam distribution valve core 22 is movably located in the steam distribution valve body 21. The steam distribution valve core 22 has a first position and a second position along the moving direction of the steam piston 12. The steam distribution valve core 22 is configured as follows: when the steam distribution valve core 22 is in the first position, the steam is controlled to enter the rodless chamber of the corresponding cylinder 1, and the steam in the rod chamber of the corresponding cylinder 1 is discharged to drive the steam piston 12 to move; when the steam distribution valve core 22 is in the second position, the steam is controlled to enter the rod chamber of the corresponding cylinder 1, and the steam in the rodless chamber of the corresponding cylinder 1 is discharged to drive the steam piston 12 to move.

[0055] In the above implementation, since the steam distribution valve core 22 has a first position and a second position, the corresponding cylinder 1 can be controlled to perform telescopic movement by controlling the position of the steam distribution valve core 22. For example, by controlling the steam distribution valve core 22 to be in the first position, the steam can be controlled to enter the rodless chamber of the corresponding cylinder 1, and at the same time, the steam is discharged from the rod chamber to drive the steam-driven piston 12 of the cylinder 1 to move in accordance with the first position. Figure 4 When the steam distribution valve core 22 is in the second position, the steam can be controlled to enter the rod chamber of the corresponding cylinder 1 and to be discharged from the rodless chamber to drive the steam piston 12 of the cylinder 1 to move in accordance with the Figure 4 Move up the position in .

[0056] Figure 5 yes Figure 2 The cross-sectional view along the DD direction, combined with Figure 5 Optionally, the interior of the steam distribution valve body 21 has a first steam inlet channel 2101, a first steam exhaust channel 2102, a steam exhaust port 2103, a second steam exhaust channel 2104, and a second steam inlet channel 2105 arranged at intervals along the moving direction of the steam-actuated piston 12. The first steam inlet channel 2101 and the first steam exhaust channel 2102 are both connected to the rodless chamber of the cylinder 1 corresponding to the steam distribution unit 20, and the second steam exhaust channel 2104 and the second steam inlet channel 2105 are both connected to the rod chamber of the cylinder 1 corresponding to the steam distribution unit 20.

[0057] When the steam distribution valve core 22 is in the first position, the first steam inlet flow channel 2101 is connected to the steam inlet port 201, and the second steam exhaust flow channel 2104 is connected to the steam exhaust port 2103; when the steam distribution valve core 22 is in the second position, the second steam inlet flow channel 2105 is connected to the steam inlet port 201, and the first steam exhaust flow channel 2102 is connected to the steam exhaust port 2103.

[0058] In the above implementation, the first steam inlet flow channel 2101, the first steam exhaust flow channel 2102, the steam exhaust port 2103, the second steam exhaust flow channel 2104 and the second steam inlet flow channel 2105 are arranged inside the steam distribution valve body 21, and the first steam inlet flow channel 2101 and the first steam exhaust flow channel 2102 can be connected with the rodless chambers of the two cylinders 1, so as to pass steam to the rodless chambers of the cylinders 1 or discharge the steam in the rodless chambers. At the same time, the second steam exhaust flow channel 2104 and the second steam inlet flow channel 2105 can be connected with the rod chambers of the two cylinders 1, so as to pass steam to the rod chambers of the cylinders 1 or discharge the steam in the rod chambers.

[0059] Optionally, the two steam distribution units 20 are arranged symmetrically, and the extension direction of the symmetry axis of the two steam distribution units 20 is the same as the moving direction of the steam-actuated piston 12. For any steam distribution valve body 21, the first steam inlet channel 2101, the first steam exhaust channel 2102, the exhaust port 2103, the second steam exhaust channel 2104 and the second steam inlet channel 2105 are also symmetrical structures, and the symmetry axis is perpendicular to the symmetry axis of the two steam distribution units 20. The steam inlet 201 and the first exhaust channel 2102 are located on opposite sides of the first steam inlet channel 2101, respectively.

[0060] The steam distribution valve core 22 also has a symmetrical structure. The steam distribution valve core 22 includes a valve core shaft 221 and a valve core sleeve 222. The valve core sleeve 222 is sleeved outside the valve core shaft 221 and connected to the valve core shaft 221. Both ends of the valve core shaft 221 are located outside the steam distribution valve body 21, and the valve core shaft 221 is connected to the connecting rod assembly 6.

[0061] The two end faces of the valve core sleeve 222 are conical, and the middle part of the valve core sleeve 222 has an annular groove 2220. The outer wall of the valve core sleeve 222 is sealed and fitted with the inner wall of the steam distribution valve body 21, and at least part of the first steam inlet channel 2101, the first steam exhaust channel 2102, the steam exhaust port 2103, the second steam exhaust channel 2104 and the second steam inlet channel 2105 are all annular grooves located outside the valve core sleeve 222. In this way, the movement of the steam distribution valve core 22 can be controlled, so that when steam is introduced into the steam inlet 201, the first steam inlet channel 2101 is connected to the steam inlet 201, and the second steam exhaust channel 2104 is connected to the steam exhaust port 2103, or the second steam inlet channel 2105 is connected to the steam inlet 201, and the first steam exhaust channel 2102 is connected to the steam exhaust port 2103.

[0062] In this embodiment, the interior of the two steam distribution valve bodies 21 has a first annular groove 202 and a second annular groove 203, the first annular groove 202 is located on the side of the first steam inlet flow channel 2101 in the two steam distribution units 20 away from the second steam inlet flow channel 2105, and the second annular groove 203 is located on the side of the second steam inlet flow channel 2105 in the two steam distribution units 20 away from the first steam inlet flow channel 2101. The first annular groove 202 and the second annular groove 203 are respectively connected to the steam inlet 201, and the first annular groove 202 is connected to the first cavity accommodating the steam distribution valve core 22 in the first steam distribution unit 20a, and the second annular groove 203 is connected to the second cavity accommodating the steam distribution valve core 22 in the second steam distribution unit 20b.

[0063] Optionally, the two steam distribution units 20 include a first steam distribution unit 20a and a second steam distribution unit 20b, the first steam distribution unit 20a is connected to the first cylinder 1a correspondingly, and the second steam distribution unit 20b is connected to the second cylinder 1b correspondingly.

[0064] Figure 6 is a schematic diagram of the structure of the connected components, combined with Figure 6 The steam reciprocating pump further comprises a connecting rod assembly 6, which comprises a first connecting unit 601 and a second connecting unit 602. The first connecting unit 601 is respectively connected to the steam-driven piston 12 in the first cylinder and the steam distribution valve core 22 in the second steam distribution unit, and the second connecting unit 602 is respectively connected to the steam distribution valve core 22 in the first steam distribution unit and the steam-driven piston 12 in the second cylinder.

[0065] The first connection unit 601 is configured to control the connected pneumatic piston 12 and the steam distribution valve core 22 to move in opposite directions. The second connection unit 602 is configured to control the connected pneumatic piston 12 and the steam distribution valve core 22 to move in the same direction.

[0066] Since the first connection unit 601 controls the pneumatic piston 12 in the connected first cylinder 1a and the steam distribution valve core 22 in the second steam distribution unit 20b to move in opposite directions, the second connection unit 602 controls the pneumatic piston 12 in the connected second cylinder 1b and the steam distribution valve core 22 in the first steam distribution unit 20a to move in the same direction. Figure 4 When the steam piston 12 on the left side of the middle moves upward, the steam valve core 22 (located at Figure 4 When the steam distribution valve core 22 in the steam distribution unit 20 (the steam distribution valve core 22 on the right side in the figure) in the second cylinder 1b connected to the second connecting unit 602 (the steam distribution piston 12 on the right side in the figure) moves up, the steam distribution valve core 22 in the first steam distribution unit 20a connected to the second connecting unit 602 (the steam distribution valve core 22 on the right side in the figure) moves down. Figure 4 The steam distribution valve core 22 in the steam distribution unit 20 on the left side moves upward until it is located at the first position, so that the two steam distribution valve cores 22 can be located at different positions respectively, and the two cylinders 1 can move in turn.

[0067] Optionally, the connection unit 60 includes a connection head 61, a rotation pin 62, a rocker arm 63, a rocker arm shaft 64, a rocker 65 and a connecting rod 66. The connection head 61 is respectively connected to the pneumatic piston 12 of the cylinder 1 and the hydraulic piston 42 of the hydraulic cylinder 4. The rotation pin 62 is plugged into the outer wall of the connection head 61 and is rotationally connected to the connection head 61, and the axial direction of the rotation axis of the rotation pin 62 is perpendicular to the moving direction of the pneumatic piston 12. The first end of the rocker arm 63 is slidably inserted in the rotating pin 62, and the moving direction of the rocker arm 63 relative to the rotating pin 62 is perpendicular to the extension direction of the rotating axis of the rotating pin 62. The second end of the rocker arm 63 is rotatably connected to one end of the rocker arm shaft 64, and the middle part of the rocker arm shaft 64 is rotatably connected to the steam distribution component 2. The rocker arm shaft 64 is parallel to the rotating pin 62, and the other end of the rocker arm shaft 64 is rotatably connected to one end of the rocker lever 65. The rocker lever 65 is perpendicular to the rocker arm shaft 64, and the other end of the rocker lever 65 is hinged to the connecting rod 66. The other end of the connecting rod 66 is connected to the steam distribution valve core 22.

[0068] The rocker arm 63 and the rocker lever 65 in the first connecting unit 601 are respectively located on both sides of the axial direction of the connected rocker shaft 64, and when the steam distribution valve core 22 in the second steam distribution unit is in the upper limit position, the rocker arm 63, the rocker lever 65 and the rocker shaft 64 in the first connecting unit 601 are located in the same plane (that is, when the steam distribution valve core 22 in the second steam distribution unit is in the upper limit position, the rocker arm 63 and the rocker lever 65 in the first connecting unit 601 are arranged 180 degrees in an opposite direction relative to the rocker shaft 64).

[0069] The rocker arm 63 and the rocker lever 65 in the second connecting unit 602 are respectively located on the same side of the axial direction of the connected rocker shaft 64, and when the steam distribution valve core 22 in the first steam distribution unit is in the lower limit position, the rocker arm 63, the rocker lever 65 and the rocker shaft 64 in the second connecting unit 602 are located in the same plane (that is, when the steam distribution valve core 22 in the first steam distribution unit is in the lower limit position, the rocker arm 63 and the rocker lever 65 in the second connecting unit 602 are arranged in the same direction at 0 degrees relative to the rocker shaft 64).

[0070] See also Figure 6 , the first connection unit 601 is Figure 6 The connecting unit on the upper middle side, wherein the rocker arm 63 and the rocker lever 65 connected to the first connecting unit 601 are respectively located on both sides of the left and right directions of the rocker arm shaft 64. The rocker arm 63 and the rocker lever 65 connected to the second connecting unit 602 are respectively located on the same side of the left and right directions of the rocker arm shaft 64.

[0071] In the above implementation, the connector 61 is used to connect the pneumatic piston rod 13 and the hydraulic piston rod 43 together. The rotating pin 62 is used to be rotatably connected to the connector 61 so that the rocker arm 63 can rotate relative to the connector 61. Since the rocker arm 63 and the rocker rod 65 are rotatably connected to the two ends of the rocker shaft 64 respectively, and the rocker shaft 64 is connected to the outer wall of the steam distribution valve body 21, when the pneumatic piston rod 13 moves downward, the rocker arm 63 will rotate relative to the connector 61, and then drive the rocker shaft 64 to rotate, and the rocker shaft 64 drives the rocker rod 65 to swing upward or downward, and finally drives the connecting rod 66 to move upward or downward, thereby driving the steam distribution valve core 22 to move upward or downward.

[0072] The rocker arm 63 and the rocker lever 65 in the first connection unit 601 are respectively located on both sides of the axis direction of the connected rocker arm shaft 64, so that after the pneumatic piston rod 13 moves downward, the rocker arm 63 will move the connecting rod 66 upward when rotating, thereby realizing the reverse movement of the connected pneumatic piston 12 and the steam distribution valve core 22. The rocker arm 63 and the rocker lever 65 in the second connection unit 602 are respectively located on the same side of the axis direction of the connected rocker arm shaft 64, so that after the pneumatic piston rod 13 moves downward, the rocker arm 63 will move the connecting rod 66 downward after rotating, thereby realizing the same direction movement of the connected pneumatic piston 12 and the steam distribution valve core 22.

[0073] In this embodiment, the connector 61 is a cross connector, and the rotating pin 62 is rotatably inserted into the pin hole of the connector 61. Both ends of the rotating pin 62 respectively have square holes 620. The axis of the square hole 620 is perpendicular to the axis of the rotating pin 62.

[0074] The rocker arm 63 includes a U-shaped head 631 and a connecting rod 632. One end of the U-shaped head 631 with an opening is respectively inserted into the two square holes 620 of the rotating pin 62. The end of the U-shaped head 631 away from the opening is connected to one end of the connecting rod 632, and the other end of the connecting rod 632 is connected to the rocker arm shaft 64. The connecting head 61 is located in the U-shaped space of the U-shaped head 631. In this way, the square holes 620 can be used to allow the rocker arm 63 and the rotating pin 62 to only slide and not rotate relative to each other.

[0075] See again Figure 1 Optionally, the steam reciprocating pump further comprises a support assembly 7, which comprises at least two support columns 71, the at least two support columns 71 are parallel to each other, and one end of each of the at least two support columns 71 is connected to the cylinder body 11, and the other end of each support column 71 is connected to the liquid cylinder body 41. In this way, the cylinder 1 and the liquid cylinder 4 can be connected to each other through the support column 71 to further increase the structural strength.

[0076] Optionally, the support assembly 7 further includes a connecting plate 72, which is connected to the outer wall of the steam distribution valve body 21, and the rocker shafts 64 in the two connecting units 60 are inserted into the connecting plate 72. In this way, the connecting unit 60 can be supported by the connecting plate 72, so that the connecting unit 60 remains stable.

[0077] The following briefly introduces the working process of the steam reciprocating pump provided by the embodiment of the present disclosure:

[0078] In the initial state, the pneumatic pistons 12 and pneumatic piston rods 13 in the two cylinders 1 are both located at the bottom of the corresponding cylinder body 11. At this time, the connectors 61 in the first connection unit 601 and the second connection unit 602 are both in the lower limit position. The rocker 65 in the first connection unit 601, through the corresponding connecting rod 66, makes the steam distribution valve core 22 in the second steam distribution unit 20b in the upper limit position. The rocker 65 in the second connection unit 602, through the corresponding connecting rod 66, makes the steam distribution valve core 22 in the first steam distribution unit 20a in the lower limit position.

[0079] When steam enters the steam inlet 201 of the steam distribution assembly 2, the steam distribution valve core 22 in the first steam distribution unit 20a is at the lower limit position, the first exhaust flow channel 2102 in the first steam distribution unit 20a is closed and cut off from the exhaust port 2103, and the first steam inlet flow channel 2101 is opened and connected to the steam inlet 201. Steam enters the rodless cavity in the first cylinder 1a corresponding to the first steam distribution unit 20a from the first steam inlet flow channel 2101 in the first steam distribution unit 20a. Since the pneumatic piston 12 and the pneumatic piston rod 13 are both located at the bottom of the corresponding cylinder body 11, the pneumatic piston 12 in the first cylinder 1a remains stationary. At the same time, the steam distribution valve core 22 in the second steam distribution unit 20b is in the upper limit position, the first steam inlet channel 2101 in the second steam distribution unit 20b is closed, the first steam exhaust channel 2102 in the second steam distribution unit 20b is connected to the exhaust port 2103, the second exhaust channel 2104 is closed, and the second steam inlet channel 2105 is opened. At this time, steam enters the rod chamber of the second cylinder 1b from the second steam inlet channel 2105 in the second steam distribution unit 20b. Since the pneumatic piston 12 of the second cylinder 1b is in the lower limit position, the pneumatic piston 12 of the second cylinder 1b starts to move upward.

[0080] The pneumatic piston 12 of the second cylinder 1b moves upward, which drives the connector 61 in the second connection unit 602 and the hydraulic piston 42 of the second liquid cylinder 4b to move upward. The volume of the rod chamber of the second liquid cylinder 4b decreases and the pressure increases. The discharge valve 522 in the first accommodating chamber 501 corresponding to the rod chamber of the second liquid cylinder 4b opens, and the liquid in the first accommodating chamber 501 is pumped out from the discharge port 5102. At the same time, the volume of the rodless chamber of the second liquid cylinder 4b increases and the pressure decreases. The suction valve 521 in the second accommodating chamber 502 corresponding to the rodless chamber of the second liquid cylinder 4b opens, and the liquid is sucked into the second accommodating chamber 502 from the suction port 5101.

[0081] At the same time, the connector 61 in the second connecting unit 602 moves upward, and drives the steam distribution valve core 22 in the first steam distribution unit 20a on the left to move upward through the rotating pin 62, the rocker arm 63, the rocker arm shaft 64, the rocker 65 and the connecting rod 66. When the connector 61 in the second connecting unit 602 moves to the upper limit position, the steam distribution valve core 22 in the first steam distribution unit 20a on the left also moves to the upper limit position. At this time, the first steam inlet flow channel 2101 in the first steam distribution unit 20a is closed, the first steam exhaust flow channel 2102 is connected to the exhaust port 2103, the second steam exhaust flow channel 2104 is closed, and the second steam inlet flow channel 2105 is opened. Steam enters the rod chamber of the first cylinder 1a from the second steam inlet flow channel 2105 in the first steam distribution unit 20a on the left, and the steam-driven piston 12 of the first cylinder 1a begins to move upward. During the upward movement of the pneumatic piston 12 of the first cylinder 1 a , the pneumatic piston 12 of the second cylinder 1 b located on the right side remains stationary and is located at the upper limit position.

[0082] When the pneumatic piston 12 of the first cylinder 1a moves upward, it drives the connector 61 in the first connection unit 601 and the hydraulic piston 42 of the first liquid cylinder 4a to move upward. At this time, the volume of the rod chamber of the first liquid cylinder 4a decreases and the pressure increases. The discharge valve 522 in the first accommodating chamber 501 corresponding to the rod chamber of the first liquid cylinder 4a opens, and the liquid in the first accommodating chamber 501 is pumped out from the discharge port 5102. At the same time, the volume of the rodless chamber of the first liquid cylinder 4a increases and the pressure decreases. The suction valve 521 in the second accommodating chamber 502 corresponding to the rodless chamber of the first liquid cylinder 4a opens, and the liquid is sucked into the second accommodating chamber 502 from the suction port 5101.

[0083] At the same time, as the connector 61 in the first connecting unit 601 moves upward, the steam distribution valve core 22 in the first steam distribution unit 20a on the right side will be driven to move downward through the rotating pin 62, the rocker arm 63, the rocker arm shaft 64, the rocker 65 and the connecting rod 66. When the connector 61 in the first connecting unit 601 moves to the upper limit position, the steam distribution valve core 22 in the second steam distribution unit 20b on the right side also moves to the lower limit position. When the steam distribution valve core 22 in the second steam distribution unit 20b on the right side is in the lower limit position, the first steam inlet flow channel 2101 in the second steam distribution unit 20b is opened, the first steam exhaust flow channel 2102 is closed, the second steam exhaust flow channel 2104 is connected to the exhaust port 2103, and the second steam inlet flow channel 2105 is closed. At this time, the steam enters the rodless chamber of the second cylinder 1b from the first steam inlet flow channel 2101 in the second steam distribution unit 20b, and the steam-driven piston 12 of the second cylinder 1b begins to move downward.

[0084] When the pneumatic piston of the second cylinder 1b moves downward, the connector 61 in the second connection unit 602 and the hydraulic piston 42 of the second liquid cylinder 4b move downward. At this time, the volume of the rod chamber of the second liquid cylinder 4b increases, the pressure decreases, and the suction valve in the first accommodating chamber 501 corresponding to the rod chamber of the second liquid cylinder 4b opens, and the liquid cargo is sucked into the first accommodating chamber 501 from the suction port 5101. At the same time, the volume of the rodless chamber of the second liquid cylinder 4b decreases, and the pressure increases. The discharge valve 522 in the second accommodating chamber 502 corresponding to the rodless chamber of the second liquid cylinder 4b opens, and the liquid cargo in the second accommodating chamber 502 is pumped out from the discharge port 5102.

[0085] At the same time, as the connector 61 in the second connecting unit 602 moves downward, the steam distribution valve core 22 on the left side is driven to move downward through the rotating pin 62, the rocker arm 63, the rocker arm shaft 64, the rocker 65 and the connecting rod 66. When the connector 61 in the second connecting unit 602 moves to the lower limit position, the steam distribution valve core 22 in the first steam distribution unit 20a on the left side also moves to the lower limit position. At this time, the first steam inlet flow channel 2101 in the first steam distribution unit 20a is opened, the first steam exhaust flow channel 2102 is closed, the second steam exhaust flow channel 2104 is connected to the exhaust port 2103, and the second steam inlet flow channel 2105 is closed. Steam enters the rodless chamber of the first cylinder 1a from the first steam inlet flow channel 2101, and the steam-driven piston 12 of the first cylinder 1a begins to move downward.

[0086] When the pneumatic piston 12 of the first cylinder 1a starts to move downward, it will drive the connector 61 in the first connecting unit 601 and the hydraulic piston 42 of the first liquid cylinder 4a to move downward. At this time, the volume of the rod chamber of the first liquid cylinder 4a increases, the pressure decreases, the suction valve 521 in the first accommodating chamber 501 opens, and the liquid cargo enters the first accommodating chamber 501. The volume of the rodless chamber of the first liquid cylinder 4a decreases, the pressure increases, the discharge valve 522 in the second accommodating chamber 502 is pushed open, and the liquid cargo is pumped out.

[0087] At the same time, when the connector 61 in the first connection unit 601 rotates, the steam distribution valve core 22 in the second steam distribution unit 20b on the right side moves upward through the rotating pin 62, the rocker arm 63, the rocker arm shaft 64, the rocker 65 and the connecting rod 66. When the connector 61 in the first connection unit 601 moves to the lower limit position, the steam distribution valve core 22 in the second steam distribution unit 20b on the right side also moves to the upper limit position. This completes a complete cycle, and the cycle is repeated in the future.

[0088] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A steam reciprocating pump, characterized in that: The steam reciprocating pump comprises a steam cylinder (1), a steam distribution component (2), a liquid cylinder (4) and a pump valve component (5); The cylinder (1) comprises a cylinder body (11) and a pneumatic piston (12), wherein the pneumatic piston (12) is movably located in the cylinder body (11); The steam distribution component (2) is located outside the cylinder body (11) and is connected to the cylinder body (11), and the steam distribution component (2) is used to drive the steam-driven piston (12) to move; The hydraulic cylinder (4) comprises a hydraulic cylinder body (41) and a hydraulic piston (42), wherein the hydraulic piston (42) is movably located in the hydraulic cylinder body (41), and the hydraulic piston (42) is coaxially connected to the pneumatic piston (12); The pump-valve assembly (5) is located outside the liquid cylinder (4), and comprises a pump housing (51) and two valve control unit groups (52). The pump housing (51) has a liquid suction port (5101) and a liquid discharge port (5102) on opposite sides thereof, and the pump housing (51) has two accommodating chambers (500) inside thereof, and the two accommodating chambers (500) are respectively connected to the rod chamber and the rodless chamber of the liquid cylinder (4); The two valve control unit groups (52) are respectively located in the two accommodating chambers (500), and each of the two valve control unit groups (52) includes at least one valve control unit (520); The valve control unit (520) is used to pump out the liquid cargo in the accommodating chamber (500) from the liquid discharge port (5102) when the pressure in the accommodating chamber (500) is greater than the pressure in the liquid discharge port (5102), and to suck the liquid cargo from the liquid suction port (5101) into the accommodating chamber (500) when the pressure in the accommodating chamber (500) is less than the pressure in the liquid suction port (5101).

2. The steam reciprocating pump according to claim 1, characterized in that: The valve control unit (520) comprises a suction valve (521) and a discharge valve (522), and the suction valve (521) and the discharge valve (522) are both connected to the pump housing (51); The first oil port of the suction valve (521) is connected to the liquid suction port (5101), and the second oil port of the suction valve (521) is connected to the accommodating chamber (500) in which it is located. The suction valve (521) is configured such that when the pressure at its first oil port is greater than the pressure at its second oil port, its first oil port is connected to its second oil port; The first oil port of the discharge valve (522) is connected to the accommodating chamber (500) in which it is located, and the second oil port of the discharge valve (522) is connected to the drain port (5102). The discharge valve (522) is configured such that when the pressure at its first oil port is greater than the pressure at its second oil port, its first oil port is connected to its second oil port.

3. The steam reciprocating pump according to claim 2, characterized in that: The suction valve (521) and the discharge valve (522) have the same structure and are both one-way flow valves.

4. The steam reciprocating pump according to claim 2, characterized in that: The two accommodating chambers (500) include a first accommodating chamber (501) and a second accommodating chamber (502); The pump housing (51) further comprises a first liquid discharge channel (503), a first liquid suction channel (504), a second liquid discharge channel (505) and a second liquid suction channel (506); The first liquid discharge channel (503) and the second liquid discharge channel (505) are both connected to the liquid discharge port (5102), and the first liquid suction channel (504) and the second liquid suction channel (506) are both connected to the liquid suction port (5101); The first liquid discharge channel (503) and the first liquid suction channel (504) are respectively located on opposite sides of the first accommodating chamber (501) along the movement direction of the hydraulic piston (42); the first liquid discharge channel (503) is connected to the second oil port of the discharge valve (522) located in the first accommodating chamber (501); and the first liquid suction channel (504) is connected to the first oil port of the suction valve (521) located in the first accommodating chamber (501); The second liquid discharge channel (505) and the second liquid suction channel (506) are respectively located on opposite sides of the second accommodating chamber (502) along the movement direction of the hydraulic piston (42); the second liquid discharge channel (505) is connected to the second oil port of the discharge valve (522) located in the second accommodating chamber (502); and the second liquid suction channel (506) is connected to the first oil port of the suction valve (521) located in the second accommodating chamber (502).

5. The steam reciprocating pump according to any one of claims 1 to 4, characterized in that: There are two hydraulic cylinders (4), and the two hydraulic cylinders (4) are arranged side by side and connected along a direction perpendicular to the movement direction of the hydraulic piston (42); There are two cylinders (1), the two cylinders (1) are connected side by side and correspond to the two liquid cylinders (4) one by one, and the hydraulic piston (42) of the liquid cylinder (4) is coaxially connected to the pneumatic piston (12) of the corresponding cylinder (1); The steam distribution component (2) is connected to the two cylinders (1), and the steam distribution component (2) is used to drive the steam-driven pistons (12) in the two cylinders (1) to move in turn.

6. The steam reciprocating pump according to claim 5, characterized in that: The steam distribution assembly (2) comprises two steam distribution units (20), the two steam distribution units (20) being arranged in one-to-one correspondence with the two cylinders (1), and each of the two steam distribution units (20) being connected to the corresponding cylinder (1); Each of the two steam distribution units (20) comprises a steam distribution valve body (21) and a steam distribution valve core (22); the steam distribution valve bodies (21) of the two steam distribution units (20) are connected, and each of the two steam distribution valve bodies (21) has a steam inlet (201); The steam distribution valve core (22) is movably located in the steam distribution valve body (21), and the steam distribution valve core (22) has a first position and a second position along the moving direction of the steam-actuated piston (12). The steam distribution valve core (22) is configured as follows: when the steam distribution valve core (22) is in the first position, the steam is controlled to enter the rodless chamber of the corresponding cylinder (1), and the steam in the rod chamber of the corresponding cylinder (1) is discharged to drive the steam-actuated piston (12) to move; when the steam distribution valve core (22) is in the second position, the steam is controlled to enter the rod chamber of the corresponding cylinder (1), and the steam in the rodless chamber of the corresponding cylinder (1) is discharged to drive the steam-actuated piston (12) to move.

7. The steam reciprocating pump according to claim 6, characterized in that: The steam distribution valve body (21) has a first steam inlet flow channel (2101), a first steam exhaust flow channel (2102), a steam exhaust port (2103), a second steam exhaust flow channel (2104) and a second steam inlet flow channel (2105) arranged at intervals along the moving direction of the steam-actuated piston (12). The first steam inlet flow channel (2101) and the first steam exhaust flow channel (2102) are both connected to the rodless cavity of the cylinder (1) corresponding to the steam distribution unit (20), and the second steam exhaust flow channel (2104) and the second steam inlet flow channel (2105) are both connected to the rod cavity of the cylinder (1) corresponding to the steam distribution unit (20); When the steam distribution valve core (22) is in the first position, the first steam inlet flow channel (2101) is connected to the steam inlet port (201), and the second steam exhaust flow channel (2104) is connected to the steam exhaust port (2103); when the steam distribution valve core (22) is in the second position, the second steam inlet flow channel (2105) is connected to the steam inlet port (201), and the first steam exhaust flow channel (2102) is connected to the steam exhaust port (2103).

8. The steam reciprocating pump according to claim 6, characterized in that: The two steam distribution units (20) include a first steam distribution unit and a second steam distribution unit, the two cylinders (1) include a first cylinder and a second cylinder, the first steam distribution unit is connected to the first cylinder correspondingly, and the second steam distribution unit is connected to the second cylinder correspondingly; The steam reciprocating pump further comprises a connecting rod assembly (6), wherein the connecting rod assembly (6) comprises a first connecting unit (601) and a second connecting unit (602). The first connection unit (601) is respectively connected to the steam-actuated piston (12) in the first cylinder and the steam distribution valve core (22) in the second steam distribution unit, and the second connection unit (602) is respectively connected to the steam distribution valve core (22) in the first steam distribution unit and the steam-actuated piston (12) in the second cylinder; The first connection unit (601) is configured to control the connected pneumatic piston (12) and the steam distribution valve core (22) to move in opposite directions, and the second connection unit (602) is configured to control the connected pneumatic piston (12) and the steam distribution valve core (22) to move in the same direction.

9. The steam reciprocating pump according to claim 8, characterized in that: The connecting unit (60) comprises a connecting head (61), a rotating pin (62), a rocker arm (63), a rocker arm shaft (64), a rocker rod (65) and a connecting rod (66); The connecting head (61) is respectively connected to the pneumatic piston (12) of the pneumatic cylinder (1) and the hydraulic piston (42) of the hydraulic cylinder (4). The rotating pin (62) is inserted into the outer wall of the connecting head (61) and is rotatably connected to the connecting head (61). The axial direction of the rotating shaft of the rotating pin (62) is perpendicular to the moving direction of the pneumatic piston (12); The first end of the rocker arm (63) is slidably inserted into the rotating pin (62); the moving direction of the rocker arm (63) relative to the rotating pin (62) is perpendicular to the extending direction of the rotating axis of the rotating pin (62); the second end of the rocker arm (63) is rotatably connected to one end of the rocker arm shaft (64); the rocker arm shaft (64) is parallel to the rotating pin (62); the other end of the rocker arm shaft (64) is rotatably connected to one end of the rocker lever (65); the rocker lever (65) is perpendicular to the rocker arm shaft (64); the other end of the rocker lever (65) is hinged to the connecting rod (66); the other end of the connecting rod (66) is connected to the steam distribution valve core (22); The rocker arm (63) and the rocker lever (65) in the first connection unit (601) are respectively located on both sides of the axial direction of the rocker arm shaft (64) to which they are connected, and when the steam distribution valve core (22) in the second steam distribution unit is in an upper limit position, the rocker arm (63), the rocker lever (65) and the rocker arm shaft (64) in the first connection unit (601) are located in the same plane; The rocker arm (63) and the rocker lever (65) in the second connecting unit (602) are respectively located on the same side of the axial direction of the connected rocker arm shaft (64), and when the steam distribution valve core (22) in the first steam distribution unit is in the lower limit position, the rocker arm (63), the rocker lever (65) and the rocker arm shaft (64) in the second connecting unit (602) are located in the same plane.

10. The steam reciprocating pump according to any one of claims 1-4 and 6-9, characterized in that: The steam reciprocating pump further comprises a support assembly (7), wherein the support assembly (7) comprises at least two support columns (71), wherein the at least two support columns (71) are parallel to each other, and one end of each of the at least two support columns (71) is connected to the cylinder body (11), and the other end of each of the support columns (71) is connected to the liquid cylinder body (41).

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