Steam reciprocating pump

Abstract

The steam reciprocating pump of the present disclosure belongs to the field of marine pumps. The steam reciprocating pump comprises a cylinder, a steam distribution assembly, a liquid cylinder and a pump valve assembly; the cylinder comprises a cylinder body and a steam piston, the steam piston is movably located in the cylinder body; the steam distribution assembly is located outside the cylinder body and connected with the cylinder body; the liquid cylinder comprises a liquid cylinder body and a liquid piston, the liquid piston is movably located in the liquid cylinder body, and the liquid piston is coaxially connected with the steam piston; the pump valve assembly is located outside the liquid cylinder, and the pump valve assembly comprises a pump shell and two valve control unit groups, the pump shell has two accommodating cavities inside, and the two valve control unit groups are respectively located in the two accommodating cavities. The steam reciprocating pump of the present disclosure can improve the flow of pumped liquid cargo and improve the work efficiency.

Description

Technical Field

[0001] This disclosure pertains to the field of marine pumps, and particularly relates to a steam reciprocating pump. Background Technology

[0002] Steam reciprocating pumps are commonly used on various engineering vessels for media transportation or tank cleaning operations.

[0003] In related technologies, 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 is used to supply or exhaust steam to the rodless or rod chamber within the cylinder, enabling the pneumatic piston within the cylinder to 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 draw liquid cargo into the pump-valve assembly when the hydraulic piston moves towards the outside of the liquid cylinder. When the hydraulic piston retracts back into the liquid cylinder, it pumps the liquid cargo out of the pump-valve assembly, thus achieving media transport or tank cleaning operations.

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

[0005] This disclosure provides a steam reciprocating pump that can increase the flow rate of liquids pumped by the steam reciprocating pump, thereby improving operational efficiency. The technical solution is as follows:

[0006] This disclosure provides a steam reciprocating pump, comprising a cylinder, a steam distribution assembly, a hydraulic cylinder, and a pump-valve assembly. The cylinder includes a cylinder body and a steam-driven piston, the steam-driven piston being movably located within the cylinder body. The steam distribution assembly is located outside the cylinder body and connected to it, and is used to drive the steam-driven piston to move. The hydraulic cylinder includes a hydraulic cylinder body and a hydraulic piston, the hydraulic piston being movably located within the hydraulic cylinder body and coaxially connected to the steam-driven piston. The pump-valve assembly is located outside the hydraulic cylinder and includes a pump housing and two valve control unit groups. The pump housing has a suction port and a discharge port on each side, and two accommodating cavities inside, which are respectively connected to the rod-side cavity and the rodless cavity of the liquid cylinder. Two valve control unit groups are located in the two accommodating cavities, and each valve control unit group includes at least one valve control unit. The valve control unit is used to pump the liquid from the discharge port when the pressure in its accommodating cavity is greater than the pressure at the discharge port, and to draw the liquid from the suction port into its accommodating cavity when the pressure in its accommodating cavity is less than the pressure at the suction port.

[0007] In another implementation of this disclosure, the valve control unit includes a suction valve and a discharge valve, both of which are connected to the pump housing. The first port of the suction valve is connected to the suction port, and the second port of the suction valve is connected to the accommodating cavity. The suction valve is configured such that when the pressure at its first port is greater than the pressure at its second port, its first port connects to its second port. The first port of the discharge valve is connected to the accommodating cavity, and its second port connects to the discharge port. The discharge valve is configured such that when the pressure at its first port is greater than the pressure at its second port, its first port connects to its second port.

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

[0009] In another implementation of this disclosure, the two accommodating cavities include a first accommodating cavity and a second accommodating cavity; the pump housing further includes a first discharge channel, a first suction channel, a second discharge channel, and a second suction channel; both the first discharge channel and the second discharge channel are connected to the discharge port, and both the first suction channel and the second suction channel are connected to the suction port; the first discharge channel and the first suction channel are located on opposite sides of the first accommodating cavity 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 cavity, and the first suction channel is connected to the first oil port of the suction valve located in the first accommodating cavity; the second discharge channel and the second suction channel are located on opposite sides of the second accommodating cavity 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 cavity, and the second suction channel is connected to the first oil port of the suction valve located in the second accommodating cavity.

[0010] In another implementation of this disclosure, there are two hydraulic cylinders, which are arranged side by side and connected in a direction perpendicular to the movement direction of the hydraulic piston; there are two gas cylinders, which are arranged side by side and connected, and correspond one-to-one with the two hydraulic cylinders, with the hydraulic piston of the hydraulic cylinder coaxially connected to the gas piston of the corresponding gas cylinder; the gas distribution assembly is connected to the two gas cylinders, and the gas distribution assembly is used to drive the gas pistons in the two gas cylinders to move alternately.

[0011] In another implementation of this disclosure, the steam distribution assembly includes two steam distribution units, which are arranged one-to-one 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 each of the two steam distribution valve bodies has a steam inlet. The steam distribution valve core is movably located in the steam distribution valve body and has a first position and a second position along the movement direction of the pneumatic piston. The steam distribution valve core is configured such that: when the steam distribution valve core is in the first position, steam is controlled to enter the rodless chamber of the corresponding cylinder, while steam in the rod chamber of the corresponding cylinder is discharged to drive the pneumatic piston to move; when the steam distribution valve core is in the second position, steam is controlled to enter the rod chamber of the corresponding cylinder, while steam in the rodless chamber of the corresponding cylinder is discharged to drive the pneumatic piston to move.

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

[0013] In another implementation of this disclosure, the two steam distribution units include a first steam distribution unit and a second steam distribution unit, and the two cylinders include a first cylinder and a second cylinder. The first steam distribution unit is connected to the first cylinder, and the second steam distribution unit is connected to the second cylinder. The reciprocating steam pump further includes a connecting rod assembly, which includes a first connecting unit and a second connecting unit. The first connecting unit is connected to the pneumatic piston in the first cylinder and the steam distribution valve core in the second steam distribution unit, respectively. The second connecting unit is connected to the steam distribution valve core in the first steam distribution unit and the pneumatic piston in the second cylinder, respectively. The first connecting unit is configured to control the connected pneumatic piston to move in the opposite direction to the steam distribution valve core, and the second connecting unit is configured to control the connected pneumatic piston to move in the same direction as the steam distribution valve core.

[0014] In another implementation of this disclosure, the connecting unit includes a connector, a rotating pin, a rocker arm, a rocker arm shaft, a rocker rod, and a connecting rod; the connector is connected to the pneumatic piston of the cylinder and the hydraulic piston of the hydraulic cylinder respectively; the rotating pin is inserted into the outer wall of the connector and rotatably connected to the connector, 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, the moving direction of the rocker arm relative to the rotating pin is perpendicular to the extending direction of the rotating shaft 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 distribution 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 connecting rod. 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 distribution 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 distribution 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 distribution 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 implementation of this disclosure, the steam reciprocating pump further includes a support assembly, which includes at least two support columns that are parallel to each other, with one end of each support column connected to the cylinder body and the other end of each support column connected to the hydraulic cylinder body.

[0016] The beneficial effects of the technical solutions provided in this disclosure are:

[0017] Because the pump casing has two accommodating chambers, one of which is connected to the rodless chamber of the hydraulic cylinder, and the other to the rod chamber, when the hydraulic piston moves outward, the hydraulic pressure in the chamber connected to the rod chamber increases, while the hydraulic pressure in the chamber connected to the rodless chamber decreases. The increased hydraulic pressure within the multiple valve control units in the chamber connected to the rod chamber allows these units to pump liquid out of their respective chambers from the drain port. Conversely, the decreased hydraulic pressure within the valve control units in the chamber connected to the rodless chamber allows them to draw liquid into their respective chambers from the suction port. Conversely, when the hydraulic piston retracts into the cylinder, the hydraulic pressure in the chamber connected to the rod chamber decreases, while the hydraulic pressure in the chamber connected to the rodless chamber increases. The hydraulic pressure inside multiple valve control units located in a receiving cavity connected to the rod-side cavity of the liquid cylinder decreases, enabling the valve control units to draw liquid from the suction port into their respective receiving cavities. The hydraulic pressure inside multiple valve control units located in a receiving cavity connected to the rodless cavity of the liquid cylinder decreases, enabling the valve control units to pump liquid from their respective receiving cavities out of the discharge port.

[0018] Therefore, whether the hydraulic piston of the cylinder extends or retracts, the pump and valve assembly can simultaneously draw in and pump out liquid, thereby increasing the volume of liquid pumped per unit time and thus improving operational efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the steam reciprocating pump provided in the embodiments of this disclosure;

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

[0022] Figure 3 yes Figure 2 A cross-sectional view along the CC direction;

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

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

[0025] Figure 6 This is a structural diagram of the connecting components.

[0026] The symbols in the diagram represent the following meanings:

[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 outlet channel; 2103. Steam outlet; 2104. Second steam outlet channel; 2105. Second steam inlet channel; 2220. Annular groove; 202. First annular through groove; 203. Second annular through groove;

[0029] 4. Hydraulic cylinder; 4a. First hydraulic cylinder; 4b. Second hydraulic cylinder; 41. Cylinder body; 42. Hydraulic piston; 43. Hydraulic piston rod;

[0030] 5. Pump and valve assembly; 500. Receptacle chamber; 501. First receptacle chamber; 502. Second receptacle chamber; 503. First drain channel; 504. First suction channel; 505. Second drain channel; 506. Second suction channel; 51. Pump housing; 52. Valve control unit assembly; 5101. Suction port; 5102. Discharge port; 520. Valve control unit; 521. Suction valve; 522. Discharge valve;

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

[0032] 7. Support components; 71. Support columns; 72. Connecting plates. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

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

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

[0036] The steam distribution assembly 2 is located outside the cylinder block 11 and is connected to the cylinder block 11. The steam distribution assembly 2 is used to drive the steam-driven piston 12 to move.

[0037] The hydraulic cylinder 4 includes a cylinder body 41, a hydraulic piston 42, and a hydraulic piston rod 43. The hydraulic piston 42 is movably located within the 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 A cross-sectional view along the CC direction, combined with Figure 3 The pump-valve assembly 5 is located outside the hydraulic 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 suction port 5101 and a discharge port 5102 on opposite sides. The pump housing 51 has two accommodating cavities 500, which are respectively connected to the rod-side cavity and the rodless cavity of the hydraulic cylinder 4. The two valve control unit groups 52 are located in the two accommodating cavities 500, and each valve control unit group 52 includes at least one valve control unit 520.

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

[0040] When the steam reciprocating pump provided in this embodiment is used to transfer liquid cargo or to clean the ship's hold using liquid cargo, since the steam reciprocating pump includes a cylinder 1, a steam distribution assembly 2, and a hydraulic cylinder 4, and the hydraulic piston 42 and the steam piston 12 are coaxial, the steam piston 12 can drive the hydraulic piston 42 to move synchronously. The steam distribution assembly 2 is used to drive the steam piston 12 to move, so that steam can enter the rod chamber or rodless chamber of the cylinder 1 through the steam distribution assembly 2, and at the same time, steam can be discharged from the rod chamber or rodless chamber of the cylinder 1 to drive the steam piston 12 to reciprocate, thereby driving the hydraulic piston 42 to reciprocate synchronously.

[0041] Because the pump housing 51 has two accommodating chambers 500, one of which is connected to the rodless chamber of the hydraulic cylinder 4, and the other is connected to the rod chamber, when the hydraulic piston 42 of the hydraulic cylinder 4 moves towards the outside of the cylinder body 41, the hydraulic pressure in one of the accommodating chambers 500 connected to the rod chamber of the hydraulic cylinder 4 increases, while the hydraulic pressure in the other accommodating chamber 500 connected to the rodless chamber of the hydraulic cylinder 4 decreases. The increased hydraulic pressure within the multiple valve control units 520 located in the accommodating chamber 500 connected to the rod chamber of the hydraulic cylinder allows the valve control unit 520 to pump the liquid from its respective accommodating chamber 500 out through the drain port 5102. The decreased hydraulic pressure within the multiple valve control units 520 located in the accommodating chamber 500 connected to the rodless chamber of the hydraulic cylinder allows the valve control unit 520 to draw the liquid from its respective accommodating chamber 500 into its respective accommodating chamber through the suction port 5101. When the hydraulic piston 42 of the hydraulic cylinder 4 retracts into the cylinder body 41, the hydraulic pressure in one of the accommodating chambers 500 connected to the rod chamber of the hydraulic cylinder 4 decreases, while the hydraulic pressure in the other accommodating chamber 500 connected to the rodless chamber of the hydraulic cylinder 4 increases. The decrease in hydraulic pressure within the multiple valve control units 520 located in the accommodating chamber 500 connected to the rod chamber of the hydraulic cylinder allows the valve control units 520 to draw liquid from the suction port 5101 into their respective accommodating chambers 500. The decrease in hydraulic pressure within the multiple valve control units 520 located in the accommodating chamber 500 connected to the rodless chamber of the hydraulic cylinder allows the valve control units 520 to pump the liquid from their respective accommodating chambers 500 out of the discharge port 5102.

[0042] Therefore, when the hydraulic piston 42 of the cylinder 4 extends or retracts, the pump valve assembly 5 can simultaneously draw in and pump out liquid, thereby increasing the volume of liquid pumped per unit time and thus improving operating efficiency.

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

[0044] The first port of the discharge valve 522 is connected to the accommodating cavity 500, and the second 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 port is greater than the pressure at its second port, its first port and its second port are connected.

[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 draw in liquid 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 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 the conducting state when the pressure at their first oil port is greater than the pressure at their second oil port, and in the disconnected state when the pressure at their first oil port is not greater than the pressure at their 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 also has a first drain channel 503, a first suction channel 504, a second drain channel 505, and a second suction channel 506. Both the first drain channel 503 and the second drain channel 505 are connected to the drain port 5102, and both the first suction channel 504 and the second suction channel 506 are connected to the suction port 5101. The first drain channel 503 and the first suction channel 504 are located on opposite sides of the first accommodating chamber 501 along the direction of movement of the hydraulic piston 42. The first drain channel 503 is connected to the second port of the discharge valve 522 located in the first accommodating chamber 501, and the first suction channel 504 is connected to the first port of the suction valve 521 located in the first accommodating chamber 501. The second drain channel 505 and the second suction channel 506 are located on opposite sides of the second accommodating cavity 502 along the movement direction of the hydraulic piston 42. The second drain channel 505 is connected to the second oil port of the discharge valve 522 located in the second accommodating cavity 502, and the second suction channel 506 is connected to the first oil port of the suction valve 521 located in the second accommodating cavity 502.

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

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

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

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

[0052] In the above implementation, since the steam distribution assembly 2 drives the pneumatic pistons 12 in the two cylinders 1 to move in the same direction alternately, when the pneumatic pistons 12 move, when the pneumatic piston 12 in the first cylinder 1a moves to its limit position, the pneumatic piston 12 in the second cylinder 1b begins to move. Correspondingly, the hydraulic pistons 42 also move alternately. That is, when the hydraulic piston 42 in the first hydraulic cylinder 4a moves to its limit position (e.g., when the first hydraulic cylinder 4a moves to its limit position), the hydraulic piston 42 moves to its limit position. Figure 4 After reaching the upper or lower limit position (as shown in the diagram), the hydraulic piston 42 of the second hydraulic cylinder 4b begins to move. The alternating movement of the two hydraulic cylinders 4, compared to a single cylinder 4 operating, significantly extends the opening time of the suction valve 521 or discharge valve 522 in each accommodating cavity 500, improving the stability of the liquid transport and reducing the number of opening and closing cycles of the suction valve 521 or discharge valve 522, thereby extending their service life.

[0053] Optionally, the steam distribution assembly 2 includes two steam distribution units 20, which are arranged one-to-one with two cylinders 1, and each steam distribution unit 20 is connected to its 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 each of the two steam distribution valve bodies 21 has 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-driven piston 12. The steam distribution valve core 22 is configured such that: when the steam distribution valve core 22 is in the first position, it controls steam to enter the rodless chamber of the corresponding cylinder 1, and at the same time discharges steam from the rod chamber of the corresponding cylinder 1 to drive the steam-driven piston 12 to move; when the steam distribution valve core 22 is in the second position, it controls steam to enter the rod chamber of the corresponding cylinder 1, and at the same time discharges steam from the rodless chamber of the corresponding cylinder 1 to drive the steam-driven 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 extend and retract by controlling the position of the steam distribution valve core 22. For example, controlling the steam distribution valve core 22 to be in the first position controls the steam, allowing steam to enter the rodless chamber of the corresponding cylinder 1, while simultaneously discharging steam from the rod chamber, thereby driving the pneumatic piston 12 of the cylinder 1 according to... Figure 4 The position of the valve core 22 is lowered. When the control valve core 22 is in the second position, the steam can be controlled, allowing steam to enter the rod chamber of the corresponding cylinder 1, while simultaneously discharging steam from the rodless chamber, thereby driving the pneumatic piston 12 of cylinder 1 according to... Figure 4 The position in the middle is moved upwards.

[0056] Figure 5 yes Figure 2 A cross-sectional view along the DD direction, combined with Figure 5 Optionally, the steam distribution valve body 21 has a first steam inlet channel 2101, a first steam outlet channel 2102, a steam outlet 2103, a second steam outlet channel 2104, and a second steam inlet channel 2105 arranged at intervals along the moving direction of the pneumatic piston 12. The first steam inlet channel 2101 and the first steam outlet channel 2102 are both connected to the rodless chamber of the cylinder 1 corresponding to the steam distribution unit 20, and the second steam outlet 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 channel 2101 is connected to the steam inlet 201, and the second steam outlet channel 2104 is connected to the steam outlet 2103; when the steam distribution valve core 22 is in the second position, the second steam inlet channel 2105 is connected to the steam inlet 201, and the first steam outlet channel 2102 is connected to the steam outlet 2103.

[0058] In the above implementation, a first steam inlet channel 2101, a first steam outlet channel 2102, a steam outlet 2103, a second steam outlet channel 2104, and a second steam inlet channel 2105 are provided inside the steam distribution valve body 21. The first steam inlet channel 2101 and the first steam outlet channel 2102 are connected to the rodless chambers of the two cylinders 1 to allow steam to flow into or out of the rodless chambers of the cylinders 1. Simultaneously, the second steam outlet channel 2104 and the second steam inlet channel 2105 are connected to the rod chambers of the two cylinders 1 to allow steam to flow into or out of the rod chambers of the cylinders 1.

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

[0060] The steam distribution valve core 22 is also 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 fitted outside the valve core shaft 221 and connected to the valve core shaft 221. The two 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 valve core sleeve 222 has tapered ends and an annular groove 2220 in its middle. The outer wall of the valve core sleeve 222 is sealed to the inner wall of the steam distribution valve body 21, and at least a portion of the first steam inlet channel 2101, the first steam outlet channel 2102, the steam outlet 2103, the second steam outlet channel 2104, and the second steam inlet channel 2105 are annular grooves located on the outside of the valve core sleeve 222. This allows control of the movement of the steam distribution valve core 22, such that when steam enters through the steam inlet 201, the first steam inlet channel 2101 is connected to the steam inlet 201, and the second steam outlet channel 2104 is connected to the steam outlet 2103; or the second steam inlet channel 2105 is connected to the steam inlet 201, and the first steam outlet channel 2102 is connected to the steam outlet 2103.

[0062] In this embodiment, the interiors of the two steam distribution valve bodies 21 have 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 channel 2101 in the two steam distribution units 20 away from the second steam inlet channel 2105, and the second annular groove 203 is located on the side of the second steam inlet channel 2105 in the two steam distribution units 20 away from the first steam inlet 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 in the first steam distribution unit 20a that houses the steam distribution valve core 22, and the second annular groove 203 is connected to the second cavity in the second steam distribution unit 20b that houses the steam distribution valve core 22.

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

[0064] Figure 6 This is a structural diagram of the connecting components, combined with... Figure 6 The steam reciprocating pump also includes a connecting rod assembly 6, which includes a first connecting unit 601 and a second connecting unit 602. The first connecting unit 601 is connected to the pneumatic piston 12 in the first cylinder and the steam distribution valve core 22 in the second steam distribution unit, respectively. The second connecting unit 602 is connected to the steam distribution valve core 22 in the first steam distribution unit and the pneumatic piston 12 in the second cylinder, respectively.

[0065] The first connecting 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 connecting 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] Because the first connecting unit 601 controls the pneumatic piston 12 in the first cylinder 1a and the steam distribution valve core 22 in the second steam distribution unit 20b to move in opposite directions, and the second connecting unit 602 controls the pneumatic piston 12 in the second cylinder 1b and the steam distribution valve core 22 in the first steam distribution unit 20a to move in the same direction, the pneumatic piston 12 in the first cylinder 1a connected to the first connecting unit 601 (located in...) Figure 4 When the pneumatic piston 12 on the left side moves upward, the steam distribution valve core 22 (located in the second steam distribution unit 20b connected to the first connecting unit 601) moves upward. Figure 4 When the steam valve core 22 in the right-hand steam distribution unit 20 moves downward, and the pneumatic piston 12 (the pneumatic piston 12 on the right in the diagram) in the second cylinder 1b connected to the second connecting unit 602 moves upward, the steam valve core 22 (located in the first steam distribution unit 20a connected to the second connecting unit 602) moves upward. Figure 4 The steam distribution valve core 22 in the steam distribution unit 20 on the left side moves upward until it is in the first position, so that the two steam distribution valve cores 22 are in different positions, and the two cylinders 1 move in turn.

[0067] Optionally, the connecting unit 60 includes a connector 61, a rotating pin 62, a rocker arm 63, a rocker arm shaft 64, a rocker rod 65, and a connecting rod 66. The connector 61 is connected to the pneumatic piston 12 of the cylinder 1 and the hydraulic piston 42 of the hydraulic cylinder 4, respectively. The rotating pin 62 is inserted into the outer wall of the connector 61 and is rotatably connected to the connector 61. The axis of rotation of the rotating pin 62 is perpendicular to the direction of movement of the pneumatic piston 12. The first end of the rocker arm 63 is slidably inserted into the rotating pin 62. The direction of movement of the rocker arm 63 relative to the rotating pin 62 is perpendicular to the extension direction of the rotation 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 middle part of the rocker arm shaft 64 is rotatably connected to the steam distribution assembly 2. 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 arm 65. The rocker arm 65 is perpendicular to the rocker arm shaft 64. The other end of the rocker arm 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] In the first connecting unit 601, the rocker arm 63 and rocker rod 65 are located on both sides of the axis of the connected rocker arm shaft 64. When the steam distribution valve core 22 in the second steam distribution unit is in the upper limit position, the rocker arm 63, rocker rod 65 and rocker arm 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 rocker rod 65 in the first connecting unit 601 are arranged in opposite directions at 180 degrees relative to the rocker arm shaft 64).

[0069] In the second connecting unit 602, the rocker arm 63 and rocker rod 65 are located on the same side of the axis of the connected rocker arm shaft 64. When the steam distribution valve core 22 in the first steam distribution unit is in the lower limit position, the rocker arm 63, rocker rod 65 and rocker arm 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 rocker rod 65 in the second connecting unit 602 are arranged in the same direction at 0 degrees relative to the rocker arm shaft 64).

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

[0071] In the above implementation, connector 61 is used to connect the pneumatic piston rod 13 and the hydraulic piston rod 43 together. Rotary pin 62 is used to rotatably connect with connector 61 so that rocker arm 63 rotates relative to connector 61. Since rocker arm 63 and rocker rod 65 are respectively rotatably connected to both ends of rocker arm shaft 64, and rocker arm shaft 64 is connected to the outer wall of steam distribution valve body 21, when pneumatic piston rod 13 moves downward, rocker arm 63 will rotate relative to connector 61, thereby rotating rocker arm shaft 64. Rocker arm shaft 64 swings rocker rod 65 (up or down), and finally moves connecting rod 66 up or down, thereby moving steam distribution valve core 22 up or down.

[0072] In the first connecting unit 601, the rocker arm 63 and rocker rod 65 are located on opposite sides of the axis of the connected rocker arm shaft 64. When the pneumatic piston rod 13 moves downward, the rocker arm 63, upon rotation, will move the connecting rod 66 upward, thus achieving opposite movements between the connected pneumatic piston 12 and the steam distribution valve core 22. In the second connecting unit 602, the rocker arm 63 and rocker rod 65 are located on the same side of the axis of the connected rocker arm shaft 64. When the pneumatic piston rod 13 moves downward, the rocker arm 63, upon rotation, will move the connecting rod 66 downward, thus achieving same-direction movements between the connected pneumatic piston 12 and the steam distribution valve core 22.

[0073] In this embodiment, the connector 61 is a cross-shaped connector, and the rotating pin 62 is rotatably inserted into the pin hole of the connector 61. Each end of the rotating pin 62 has a square hole 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 open end of the U-shaped head 631 is inserted into one of 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 within the U-shaped space of the U-shaped head 631. This allows the rocker arm 63 to slide relative to the rotating pin 62 through the square holes 620, preventing relative rotation.

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

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

[0077] The working process of the steam reciprocating pump provided in this embodiment is briefly described below:

[0078] In the initial state, the pneumatic pistons 12 and piston rods 13 in both cylinders 1 are located at the bottom of their respective cylinder bodies 11. At this time, the connectors 61 in the first connecting unit 601 and the second connecting unit 602 are both in their lower limit positions. The rocker arm 65 in the first connecting unit 601, through the corresponding connecting rod 66, causes the valve core 22 in the second valve distribution unit 20b to be in its upper limit position. The rocker arm 65 in the second connecting unit 602, through the corresponding connecting rod 66, causes the valve core 22 in the first valve distribution unit 20a to be in its 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 its lower limit position. The first exhaust steam passage 2102 in the first steam distribution unit 20a is closed and cut off from the exhaust port 2103, while the first inlet steam passage 2101 is opened and connected to the steam inlet 201. Steam enters the rodless chamber of the first cylinder 1a corresponding to the first steam distribution unit 20a through the first inlet steam passage 2101. 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 outlet channel 2102 in the second steam distribution unit 20b is connected to the steam outlet 2103, the second steam outlet 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 begins to move upward.

[0080] The upward movement of the pneumatic piston 12 in the second cylinder 1b causes the connector 61 in the second connecting unit 602 and the hydraulic piston 42 in the second hydraulic cylinder 4b to move upward. The volume of the rod chamber of the second hydraulic 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 hydraulic cylinder 4b, opens, pumping the liquid from the first accommodating chamber 501 out through the discharge port 5102. Simultaneously, the volume of the rodless chamber of the second hydraulic 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 hydraulic cylinder 4b, opens, drawing the liquid into the second accommodating chamber 502 from the suction port 5101.

[0081] Simultaneously, the connector 61 in the second connecting unit 602 moves upward, which in turn drives the steam distribution valve core 22 in the first steam distribution unit 20a located on the left to move upward via the rotating pin 62, rocker arm 63, rocker arm shaft 64, rocker arm 65, and connecting rod 66. When the connector 61 in the second connecting unit 602 reaches its upper limit position, the steam distribution valve core 22 in the first steam distribution unit 20a located on the left also reaches its upper limit position. At this time, the first steam inlet channel 2101 in the first steam distribution unit 20a closes, the first steam outlet channel 2102 connects with the steam outlet 2103, the second steam outlet channel 2104 closes, and the second steam inlet channel 2105 opens. Steam enters the rod chamber of the first cylinder 1a from the second steam inlet channel 2105 in the first steam distribution unit 20a located on the left, and the pneumatic piston 12 of the first cylinder 1a begins to move upward. During the upward movement of the pneumatic piston 12 in the first cylinder 1a, the pneumatic piston 12 in the second cylinder 1b located on the right side remains stationary and is in 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 connecting 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, which is connected to the rod chamber of the first liquid cylinder 4a, opens, pumping the liquid in the first accommodating chamber 501 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, which is connected to the rodless chamber of the first liquid cylinder 4a, opens, drawing the liquid into the second accommodating chamber 502 from the suction port 5101.

[0083] Simultaneously, as the connector 61 in the first connecting unit 601 moves upward, it drives the steam distribution valve core 22 in the first steam distribution unit 20a on the right side to move downward via the rotating pin 62, rocker arm 63, rocker arm shaft 64, rocker arm 65, and connecting rod 66. When the connector 61 in the first connecting unit 601 moves to its upper limit position, the one on the right side also moves to its lower limit position. When the steam distribution valve core 22 in the second steam distribution unit 20b on the right side is in its lower limit position, the first steam inlet channel 2101 in the second steam distribution unit 20b opens, the first steam outlet channel 2102 closes, the second steam outlet channel 2104 connects to the steam outlet 2103, and the second steam inlet channel 2105 closes. At this time, steam enters the rodless chamber of the second cylinder 1b from the first steam inlet channel 2101 in the second steam distribution unit 20b, and the pneumatic piston 12 of the second cylinder 1b begins to move downward.

[0084] When the pneumatic piston of the second cylinder 1b moves downward, it drives the connector 61 in the second connecting unit 602 and the hydraulic piston 42 of the second hydraulic cylinder 4b to move downward. At this time, the volume of the rod chamber of the second hydraulic cylinder 4b increases and the pressure decreases. The suction valve in the first accommodating chamber 501, which is connected to the rod chamber of the second hydraulic cylinder 4b, opens, drawing the liquid into the first accommodating chamber 501 from the suction port 5101. Simultaneously, the volume of the rodless chamber of the second hydraulic cylinder 4b decreases and the pressure increases. The discharge valve 522 in the second accommodating chamber 502, which is connected to the rodless chamber of the second hydraulic cylinder 4b, opens, pumping the liquid in the second accommodating chamber 502 out from the discharge port 5102.

[0085] Simultaneously, as the connector 61 in the second connecting unit 602 moves downward, it drives the steam distribution valve core 22 located on the left side to move downward via the rotating pin 62, rocker arm 63, rocker arm shaft 64, rocker arm 65, and connecting rod 66. When the connector 61 in the second connecting unit 602 reaches its lower limit position, the steam distribution valve core 22 in the first steam distribution unit 20a located on the left side also reaches its lower limit position. At this time, the first steam inlet passage 2101 in the first steam distribution unit 20a opens, the first steam outlet passage 2102 closes, the second steam outlet passage 2104 connects to the steam outlet 2103, and the second steam inlet passage 2105 closes. Steam enters the rodless chamber of the first cylinder 1a through the first steam inlet passage 2101, and the pneumatic piston 12 of the first cylinder 1a begins to move downward.

[0086] When the pneumatic piston 12 of the first cylinder 1a begins to move downwards, it drives the connector 61 in the first connecting unit 601 and the hydraulic piston 42 of the first liquid cylinder 4a to move downwards. 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 receiving chamber 501 opens, and the liquid enters the first receiving 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 receiving chamber 502 is opened, and the liquid is pumped out.

[0087] Simultaneously, when the connector 61 in the first connecting unit 601 is engaged, it will drive the steam distribution valve core 22 in the second steam distribution unit 20b located on the right side to move upward via the rotating pin 62, rocker arm 63, rocker arm shaft 64, rocker arm 65, and connecting rod 66. When the connector 61 in the first connecting unit 601 reaches its lower limit position, the steam distribution valve core 22 in the second steam distribution unit 20b located on the right side also reaches its upper limit position. This completes one full cycle, and subsequent cycles repeat accordingly.

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

Claims

1. A steam reciprocating pump characterized by, The steam reciprocating pump comprises a first cylinder, a second cylinder, a first steam distribution unit, a second steam distribution unit, two liquid cylinders (4), a pump valve assembly (5) and a connecting rod assembly (6); The first cylinder and the second cylinder are identical in structure and each comprises a cylinder body (11) and a steam-driven piston (12) movably located in the cylinder body (11); The first steam distribution unit and the second steam distribution unit are located outside the two cylinder bodies (11), the first steam distribution unit is connected with the first cylinder in correspondence, the second steam distribution unit is connected with the second cylinder in correspondence, the first steam distribution unit and the second steam distribution unit have a steam inlet (201), each steam distribution unit (20) in the first steam distribution unit and the second steam distribution unit comprises a steam distribution valve body (21) and a steam distribution valve core (22), 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-driven piston (12), the inside of the steam distribution valve body (21) has a first steam inlet flow channel (2101), a first steam outlet flow channel (2102), a steam outlet (2103), a second steam outlet flow channel (2104) and a second steam inlet flow channel (2105) arranged at intervals along the moving direction of the steam-driven piston (12), the first steam inlet flow channel (2101) and the first steam outlet flow channel (2102) are connected with the rodless cavity of the cylinder (1) corresponding to the steam distribution unit (20) where they are located, the second steam outlet flow channel (2104) and the second steam inlet flow channel (2105) are connected with the rod cavity of the cylinder (1) corresponding to the steam distribution unit (20) where they are located, when the steam distribution valve core (22) is at the first position, the first steam inlet flow channel (2101) is in communication with the steam inlet (201), and the second steam outlet flow channel (2104) is in communication with the steam outlet (2103), when the steam distribution valve core (22) is at the second position, the second steam inlet flow channel (2105) is in communication with the steam inlet (201), and the first steam outlet flow channel (2102) is in communication with the steam outlet (2103); The two liquid cylinders (4) are arranged side by side and connected in a direction perpendicular to the moving direction of the liquid-driven piston (42) and are arranged in one-to-one correspondence with the first cylinder and the second cylinder respectively, each liquid cylinder (4) comprises a liquid cylinder body (41) and a liquid-driven piston (42) movably located in the liquid cylinder body (41), the liquid-driven piston (42) is coaxially connected with the corresponding steam-driven piston (12); The pump valve assembly (5) is located outside the liquid cylinder (4), the pump valve assembly (5) includes a pump shell (51) and two valve control unit groups (52), the opposite sides of the pump shell (51) are respectively provided with a liquid suction port (5101) and a liquid discharge port (5102), the pump shell (51) is internally provided with two accommodating cavities (500), the two accommodating cavities (500) are respectively connected with the rod cavity and the rodless cavity of the liquid cylinder (4), the two valve control unit groups (52) are respectively located in the two accommodating cavities (500), each valve control unit group (52) in the two valve control unit groups (52) includes at least one valve control unit (520); The valve control unit (520) is used for pumping out the liquid cargo in the accommodating cavity (500) from the liquid discharge port (5102) when the pressure in the accommodating cavity (500) is greater than the pressure of the liquid discharge port (5102), and is used for sucking the liquid cargo from the liquid suction port (5101) into the accommodating cavity (500) when the pressure in the accommodating cavity (500) is less than the pressure of the liquid suction port (5101); The connecting rod assembly (6) includes a first connecting unit (601) and a second connecting unit (602), each connecting unit (60) in the first connecting unit (601) and the second connecting unit (602) includes a connecting head (61), a rotating pin (62), a rocker arm (63), a rocker arm shaft (64), a rocker (65) and a connecting rod (66), the rotating pin (62) is inserted into the outer wall of the connecting head (61) and is rotationally connected with the connecting head (61), the axis 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 extension direction of the rotating axis of the rotating pin (62), the second end of the rocker arm (63) is rotationally connected with 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 rotationally connected with one end of the rocker (65), the rocker (65) is perpendicular to the rocker arm shaft (64), the other end of the rocker (65) is hingedly connected with the connecting rod (66), the connecting head (61) in the first connecting unit (601) is connected with the pneumatic piston (12) in the first cylinder, the other end of the connecting rod (66) in the first connecting unit (601) is connected with the valve core (22) in the second valve distribution unit, the connecting head (61) in the second connecting unit (602) is connected with the pneumatic piston (12) in the second cylinder, the other end of the connecting rod (66) in the second connecting unit (602) is connected with the valve core (22) in the first valve distribution unit. The rocker arm (63) and the rocker lever (65) in the first connecting unit (601) are respectively located on two sides of the axis direction of the connected rocker arm shaft (64), and when the valve spool (22) in the second valve distribution unit is at the upper limit position, the rocker arm (63), the rocker lever (65) and the rocker arm shaft (64) in the first connecting 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 axis direction of the connected rocker arm shaft (64), and when the valve spool (22) in the first valve distribution unit is at 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.

2. The steam reciprocating pump of claim 1, wherein, 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 connected with the pump shell (51).

3. The steam reciprocating pump of claim 2, wherein, The suction valve (521) and the discharge valve (522) are the same structure, and are both one-way flow valves.

4. The steam reciprocating pump of claim 2, wherein, The two accommodating cavities (500) comprise a first accommodating cavity (501) and a second accommodating cavity (502); The pump shell (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 connected with the liquid discharge port (5102), and the first liquid suction channel (504) and the second liquid suction channel (506) are connected with 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 cavity (501) along the movement direction of the hydraulic piston (42); The second liquid discharge channel (505) and the second liquid suction channel (506) are respectively located on opposite sides of the second accommodating cavity (502) along the movement direction of the hydraulic piston (42).

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

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