Reciprocating type low-temperature pump structure

Abstract

The utility model relates to the technical field of gas conveying, in particular to a reciprocating type low-temperature pump structure which comprises a hollow shell, and an inner cavity of the shell is divided into two cavities which are connected in parallel. One end of the shell is a working end, and a second piston mechanism is arranged in the shell and connected with the first piston mechanism of the inner cavity to serve as a power source. The working end is provided with a liquid inlet and a liquid outlet for liquid to enter and exit. The working end is provided with a liquid inlet and a liquid outlet which are respectively communicated with the interior; the liquid inlet and the liquid outlet are respectively used for feeding and discharging liquid; a cooling flow channel is arranged between the outside of the shell and the inner cavity and connected with a cooling liquid inlet and outlet, and cooling liquid circulation is achieved. A cooling flow channel is arranged between the outer part of the shell and the inner wall of the inner cavity; the cooling flow channel is provided with a cooling liquid inlet and a cooling liquid outlet; the cooling liquid inlet and the cooling liquid outlet are communicated outside the shell through a pipeline, and cooling liquid is recycled. The pump is suitable for low-temperature working conditions and can transport liquid hydrogen, liquid oxygen and other special media.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas delivery technical field especially relates to a reciprocating low temperature pump structure. BACKGROUND

[0002] Reciprocating low temperature pump is a kind of positive displacement compressor specially designed for working in low temperature environment. Its main task is to transport low temperature liquid from an area with lower pressure to another area with higher pressure. The working principle of this pump is very similar to that of traditional reciprocating compressor, both of which rely on the reciprocating movement of piston (or plunger) in the working cavity of liquid cylinder to realize their functions. Specifically, the piston (or plunger) reciprocates in the working cavity of liquid cylinder, causing the volume of working cavity to change periodically, thus completing the entire working process of liquid suction, compression and discharge. During the working process of reciprocating low temperature pump, when the piston (or plunger) moves from left to right, the volume inside the pump cylinder will increase, resulting in a decrease in internal pressure. At this time, low temperature liquid enters the pump cylinder through the suction valve under the action of pressure difference. When the crank turns 180 degrees, the piston starts to move to the left, and the low temperature liquid is compressed, and the pressure rises rapidly. When the liquid pressure in the pump cylinder reaches a sufficient level to open the discharge valve, the liquid is output to the discharge pipeline through the discharge valve. This process will be repeated continuously, but since the discharge process is based on the reciprocating movement of the piston, the discharge is intermittent, not continuous. Reciprocating low temperature pump has been widely used in many industries due to its unique low temperature working capability and reliable positive displacement compression principle. In particular, in the petroleum, air separation and chemical industries, reciprocating low temperature pump plays a crucial role. These industries often need to handle a large amount of low temperature liquid, and reciprocating low temperature pump can effectively transport these liquids from low pressure areas to high pressure areas, ensuring the smooth progress of the entire production process.

[0003] In the patent "ultra-low temperature reciprocating piston pump" (publication number CN204877921U, hereinafter referred to as prior art 1), a reciprocating piston pump is disclosed. In prior art 1, double pressure sensitive detection sealing gas system is used to realize zero leakage of piston pump, ensure normal work of piston pump and improve its service life. Specifically, the pump adopts the design that the inner end of cylinder body is arranged in the pump body, and the outer end extends to the outside through the pump body, and includes different gas pressures of first gas pressure area and second gas pressure area. If leakage occurs inside the piston pump, it will cause the gas pressure change of the second gas pressure area to be detected by the gas pressure detection device, realizing zero leakage of the piston pump. In addition, the pump also has a double pressure sensitive system, which can detect the gas pressure of the first gas pressure area and the second gas pressure area, to ensure the normal work of the piston pump.

[0004] In the prior art 1, a zero-leakage design of the piston pump has been realized, which ensures that the piston pump does not have any leakage phenomenon during operation, thereby guaranteeing its normal working performance. However, although this design performs well in sealing performance, it fails to provide effective control over the temperature of the liquid. When the liquid handled by the piston pump is in a low-temperature state, a large amount of gas will be generated once these low-temperature liquids begin to vaporize under the influence of external heat. These gases not only increase the pressure of the system, but also can cause new leakage risks for the piston pump originally designed as zero leakage. Therefore, although the piston pump has reached the standard of zero leakage in design, the vaporization problem of low-temperature liquids still exists in actual application, which can potentially threaten the stability and safety of the system. Utility model content

[0005] Therefore, the utility model embodiment provides a reciprocating low-temperature pump structure to solve the problem that heat generated by the reciprocating structure during work causes low-temperature liquids to vaporize.

[0006] The utility model embodiment provides a reciprocating low-temperature pump structure, which comprises a shell with an inner cavity in a hollow structure; the inner cavity comprises a first chamber and a second chamber; the first chamber and the second chamber are communicated; the shell is further provided with a working end at one end close to the second chamber; the inside of the working end is communicated with the second chamber through a through hole provided on the shell; the inner cavity is provided with a first piston mechanism; the first piston mechanism is installed and extended to the second chamber through a pair of bearing seats provided in the first chamber; the inside of the working end is provided with a second piston mechanism; the first piston mechanism is connected with the second piston mechanism and serves as a power source of the second piston mechanism; the working end is provided with a liquid inlet and a liquid outlet which are respectively communicated with the inside; the liquid inlet and the liquid outlet are respectively used for the entry and discharge of liquid; a cooling flow channel is arranged between the outer part of the shell and the inner wall of the inner cavity; the cooling flow channel is provided with a cooling liquid inlet and a cooling liquid outlet; the cooling liquid inlet and the cooling liquid outlet are communicated through a pipeline outside the shell and make the cooling liquid circulate.

[0007] Preferably, the pipeline is provided with a cooling device which is communicated with the pipeline; the cooling liquid passes through the cooling device through the pipeline to restore the normal operating temperature of the cooling liquid.

[0008] Preferably, the first piston mechanism comprises a rotating shaft and a rotating disc provided on the rotating shaft; the two ends of the rotating shaft are installed through a pair of bearing seats; the rotating disc is fixedly connected with the rotating shaft; one end of the rotating shaft extends out of the outside of the shell for connection with a driving device.

[0009] Preferably, the first piston mechanism further comprises a first piston body and a first piston rod; the first piston body is arranged in the second chamber and slides in the second chamber; the rotating disc is hinged to the first piston body through a connecting rod.

[0010] Preferably, the second piston mechanism comprises a second piston rod and a second piston body; the second piston rod is fixedly connected with the second piston body; the second piston rod is fixedly connected with the first piston rod through the through hole.

[0011] Preferably, the first piston mechanism drives the second piston mechanism to move through a driving device; the second piston body slides in the interior of the working end and realizes liquid suction or discharge.

[0012] Preferably, the working end is further provided with a pressure relief port in communication with the interior; when the liquid in the interior of the working end is vaporized by heat, the pressure is increased, and the pressure relief is realized by opening the pressure relief port.

[0013] Preferably, the working end is further provided with a support protrusion on the displacement path of the second piston rod; the support protrusion is used for limiting the deviation of the second piston rod and supporting the second piston rod.

[0014] Preferably, the connecting rod is hinged to the surface of the rotating disc; the hinged position of the connecting rod and the rotating disc is arranged eccentrically.

[0015] Preferably, the liquid inlet and the liquid outlet of the working end are both provided with a one-way valve, and the flow directions of the one-way valves at the liquid inlet and the liquid outlet are consistent.

[0016] The reciprocating low-temperature pump structure has the following beneficial effects:

[0017] The cooling flow channel is arranged between the shell exterior and the inner cavity inner wall, so that the temperature of the whole pump is effectively controlled. The circulation of the cooling liquid further improves the cooling efficiency, effectively reduces the heat generated by the piston movement, and thus guarantees the working stability of the pump and the efficiency and quality of liquid transportation. The cooling flow channel can effectively absorb the heat generated by the piston movement, avoid the liquefaction of low-temperature gas caused by excessively high temperature, avoid the increase of the pressure in the pump, prolong the service life of the pump, and reduce the frequency of maintenance and replacement of parts. The cooling flow channel and the piston mechanism design can help the pump to stably operate for a long time in an extremely low-temperature environment, guarantee its adaptation to various low-temperature working conditions, and can be applied to the transportation of special media such as liquid hydrogen and liquid oxygen. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be to the utility model embodiment needed to use the drawing briefly introduced, for the ordinary skilled person in the art to come, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings, these are within the protection scope of the utility model.

[0019] Figure 1 It is a kind of reciprocating low-temperature pump structure working process schematic diagram;

[0020] Figure 2 It is another reciprocating low-temperature pump structure working process schematic diagram;

[0021] Figure 3 It is a kind of reciprocating low-temperature pump structure schematic diagram;

[0022] Parts and numbers in the drawing:

[0023] 100-shell, 111-first chamber, 112-second chamber, 113-through hole, 120-cooling flow channel, 121-cooling liquid inlet, 122-cooling liquid outlet, 123-pipe, 124-cooling device, 130-first piston mechanism, 131-rotating shaft, 132-rotating disc, 133-first piston body, 134-first piston rod, 135-connecting rod;

[0024] 200-working end, 211-liquid inlet, 212-liquid outlet, 213-pressure release port, 220-supporting protrusion, 230-one-way valve, 240-second piston mechanism, 241-second piston rod, 242-second piston body, 250-pump liquid chamber;

[0025] 300-liquid supply device;

[0026] 400-liquid storage device. DETAILED DESCRIPTION

[0027] For the purpose, technical scheme and advantages of the embodiments of the present application to be clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be noted that, in this article, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as center, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner and outer is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements. If there is no conflict, the embodiments of the present application and various features in the embodiments can be combined with each other, and are all within the protection scope of the present application.

[0028] Embodiment 1

[0029] Please refer to Figure 1 The embodiments of the present application provide a reciprocating low-temperature pump structure. Since the working principle of the reciprocating low-temperature pump is to rely on the continuous reciprocating movement of the piston, the liquid discharge cavity repeatedly performs the actions of liquid suction and liquid discharge through this way, so as to realize the effective transportation and processing of the liquid. In this process, the movement of the piston will generate a certain amount of heat, resulting in an increase in the temperature of the pump body. However, for the transportation and processing of low-temperature liquid, it is very important to maintain the liquid in a low-temperature state, because the increase in temperature may adversely affect the properties and quality of the liquid. Therefore, in order to ensure the stability and safety of the low-temperature liquid, effective cooling treatment needs to be performed on the part where the piston moves. Through the action of the cooling system, the temperature of the piston movement area can be effectively reduced, so as to avoid the liquid temperature being too high. In addition, when the piston moves at a relatively low speed, the heat generated is relatively small, and the cooling operation can be appropriately reduced or stopped to avoid the piston components being difficult to maintain normal operating ability in a low-temperature environment. Doing so not only can prolong the service life of the cooling system, but also can ensure the transportation and processing quality of the low-temperature liquid.

[0030] Referring to Figure 2 The embodiment provides a reciprocating low-temperature pump structure, which mainly comprises a shell 100 with a hollow interior and an inner cavity. In the inner cavity, a first piston mechanism 130 is arranged. The first piston mechanism 130 is installed through two bearing seats arranged in the inner cavity, and is structured so as to extend to another part of the inner cavity, i.e. a second chamber 112. Through such an arrangement, the first piston mechanism 130 can not only stably operate in the inner cavity, but also serve as a power source of the entire low-temperature pump. Under the drive of the first piston mechanism 130, subsequent working components can efficiently perform liquid suction or discharge operations, thereby ensuring smooth and efficient operation of the entire low-temperature pump system.

[0031] Referring to Figure 3 In the embodiment, the inner cavity structure comprises two main parts, i.e. a first chamber 111 and a second chamber 112. The two chambers are in communication with each other, ensuring that the internal components can move between the two chambers. In addition, the shell 100 is provided with a working end 200 at one end close to the second chamber 112. The interior of the working end 200 is in communication with the second chamber 112 through the through hole 113 arranged on the shell 100. Such a design enables the working end 200 to effectively perform its predetermined functions, while ensuring smooth connection with the second chamber 112, thereby ensuring the operation of the entire device. The working end 200 refers to an end for performing liquid suction or discharge operations, while one end of the shell 100 is an end provided as a basic power component. The two ends are in communication with each other through the through hole 113, so that the components can be smoothly connected. In this way, through this way, reciprocating operation can be realized, i.e. while the working end 200 performs liquid suction or discharge, the basic power component can provide continuous power support, ensuring efficient operation of the entire system. Specifically, the liquid in the liquid supply device 300 is first sucked into the pump liquid chamber 250, and then the liquid in the pump liquid chamber 250 is sent into the liquid storage device 400.

[0032] Referring to Figure 2 and Figure 3, a second piston mechanism 240 is provided and installed inside the working end 200; at the same time, in order to ensure that the second piston mechanism 240 can operate normally, the first piston mechanism 130 and the second piston mechanism 240 are tightly connected by mechanical connection, so that the first piston mechanism 130 can provide the necessary power support for the second piston mechanism 240. In addition, the working end 200 is also provided with two pipes 123 connected to the internal space, namely the liquid inlet 211 and the liquid outlet 212. The main functions of these two pipes 123 are to be used for the entry and discharge of liquid, respectively, to ensure that the liquid can circulate effectively inside the working end 200. The interior of the working end 200 is a pump liquid chamber. When the second piston mechanism 240 reciprocates in the pump liquid chamber, the liquid is sucked into or discharged from the pump liquid chamber through the corresponding suction or discharge channel, thereby realizing the operation process of pumping liquid.

[0033] See Figure 1 , a cooling channel 120 is provided between the outside of the shell 100 and the inner wall of the inner cavity. This cooling channel 120 passes through the heated part of the shell 100 so as to effectively absorb and discharge the heat transferred from the inner cavity to the outside of the shell 100. In order to achieve this function, the cooling channel 120 system is equipped with a special coolant inlet 121 and a coolant outlet 122. These two ports are respectively located at different positions of the shell 100 to ensure that the coolant can flow in and out smoothly. The setting of the first chamber 111 and the second chamber 112 also increases the sealed isolation of the liquid and the coolant, reduces the risk of contact between the low-temperature liquid and the external air or ambient heat, and reduces the interference of liquid vaporization or external temperature on the temperature inside the pump.

[0034] Specifically, coolant inlet 121 allows coolant to enter cooling channel 120 from the outside. Coolant outlet 122, located at the other end of housing 100, allows coolant to flow out after being cooled by the internal cavity. To ensure continuous circulation of the coolant, coolant inlet 121 and coolant outlet 122 are interconnected outside housing 100 via pipes 123. These pipes 123 not only ensure the smooth flow of coolant, but also ensure the efficient operation of the cooling system, allowing the coolant to be reused.

[0035] In this way, the coolant can circulate in the cooling channel 120, continuously absorbing heat from the inner cavity and transferring it to the outside of the shell 100, thereby effectively controlling the temperature of the inner cavity, ensuring the normal operation of the equipment and extending its service life.

[0036] See Figure 1A cooling device 124 is also provided on the pipe 123. The cooling device 124 is in communication with the pipe 123, ensuring smooth fluid exchange between the two. Through this connection, the cooling liquid can flow inside the pipe 123 and be effectively cooled by the cooling device 124.

[0037] Specifically, when the cooling liquid flows in the pipe 123, its temperature may rise due to the absorption of heat from the working end 200 or the housing 100, resulting in poor cooling effect after circulation. At this time, the role of the cooling device 124 becomes particularly important. It uses cooling mechanisms to cool the high-temperature cooling liquid in the pipe 123 with cooling media or coolants. In this way, the cooling liquid can recover to a suitable temperature for normal operation after passing through the cooling device 124. Such design not only ensures that the temperature of the cooling liquid in the pipe 123 always remains within the ideal range, but also improves the stability and reliability of the entire system. Through effective temperature control, equipment damage or performance degradation due to high temperature can be avoided, ensuring efficient operation of the entire system.

[0038] Further, when the operating speed of the first piston mechanism 130 and the second piston mechanism 240 reaches a high level, their efficiency in pumping liquid will be significantly improved, and the temperature generated due to friction and compression will also rise accordingly. In this case, in order to ensure stable operation of the system and prevent overheating from causing the low-temperature liquid to vaporize, the cooling device 124 can be activated to effectively control the temperature of the cooling liquid. The activation of the cooling device 124 will help maintain the temperature of the entire system within a safe and ideal range, ensuring normal operation of the equipment and prolonging its service life.

[0039] However, in another case, when the operating speed of the first piston mechanism 130 and the second piston mechanism 240 is at a general level, the heat generated will not be excessive. However, these heat still has a certain significance. They can provide the necessary heat for the first piston mechanism 130 and the second piston mechanism 240 to ensure their good operating state in low-temperature environments. In this case, in order to save energy and reduce unnecessary cooling liquid circulation, the cooling device 124 can be turned off to stop the flow of cooling liquid. In this way, the housing 100 and the working end 200 will retain a certain amount of heat, maintaining a suitable operating temperature and ensuring stable operation of the equipment under various environmental conditions, and the liquid will not vaporize due to this heat.

[0040] Please refer to Figure 3In the embodiment, the first piston mechanism 130 mainly comprises a rotating shaft 131 and a rotating disc 132 arranged on the rotating shaft 131. The rotating shaft 131 is installed through a pair of bearing seats at both ends, ensuring its stability and flexibility. The rotating disc 132 is fixedly connected with the rotating shaft 131, ensuring synchronous movement of the two. In addition, one end of the rotating shaft 131 extends out of the shell 100, so as to be connected with an external driving device, thereby realizing driving of the whole mechanism.

[0041] Further, the first piston mechanism 130 further comprises a first piston body 133 and a first piston rod 134. The first piston body 133 is arranged in the second cavity 112 and can slide in the second cavity 112. The rotating disc 132 is hingedly connected with the first piston body 133 through a connecting rod 135, so that the rotating movement of the rotating disc 132 can be effectively converted into the linear movement of the first piston body 133. The second piston mechanism 240 comprises a second piston rod 241 and a second piston body 242. The second piston rod 241 is fixedly connected with the second piston body 242, ensuring synchronous movement of the two. The second piston rod 241 passes through the through hole 113 on the shell 100 and is fixedly connected with the first piston rod 134, so that the movement of the first piston rod 134 can be transmitted to the second piston rod 241. When the first piston mechanism 130 is driven by the external driving device, it drives the second piston mechanism 240 to move. Under the linkage, the second piston body 242 slides in the inside of the working end 200, thereby realizing the functions of liquid suction and discharge. The design of the whole mechanism can convert the rotating movement of the rotating disc 132 into linear movement, ensuring the efficiency and reliability of liquid delivery.

[0042] Further in detail, the external driving device is in driving connection with the rotating shaft 131. When the driving device is started, the rotating disc 132 is driven to move. At the same time, the two ends of the connecting rod 135 are hingedly connected with the rotating disc 132 and the first piston body 133 respectively, forming a typical crank rocker mechanism. The existence of the mechanism enables the first piston body 133 to reciprocate in the second cavity. The reciprocating movement is transmitted to the second piston rod 241 through the first piston rod 134, thereby driving the second piston body 242 to reciprocate in the pump liquid chamber.

[0043] Specifically, when the second piston body 242 moves towards the first piston mechanism 130, a negative pressure is generated inside the pump liquid chamber. This negative pressure functions to suck liquid into the pump liquid chamber through the liquid inlet 211. Conversely, when the second piston body 242 moves away from the first piston mechanism 130, the pressure inside the pump liquid chamber rises. This rise in pressure causes liquid to be expelled from the pump liquid chamber 250 through the liquid outlet 212. By continuously repeating the above actions, i.e. the reciprocating movement of the second piston body 242, reciprocating pumping can be achieved. This mode of operation ensures continuous liquid suction and discharge, thereby meeting the pumping requirements.

[0044] Referring to Figure 3 In the structure of the working end 200, a pressure relief port 213 is also provided, which is in communication with the interior of the working end 200. The function of this pressure relief port 213 is to effectively release the internal pressure when the low-temperature liquid inside the working end 200 vaporizes due to heating. Specifically, when the liquid inside the working end 200 gradually vaporizes under high-temperature conditions, causing the internal pressure to continuously rise, the timely opening of this pressure relief port 213 can quickly expel excess gas, thereby avoiding dangerous situations caused by excessively high internal pressure.

[0045] Specifically, during the reciprocating movement of the first piston body 133 and the second piston body 242, a certain amount of heat is generated due to friction and compression. This heat causes the low-temperature liquid inside the pump liquid chamber to vaporize, further increasing the internal pressure. If this pressure is not released in time, the pump liquid chamber will be in a dangerous state, which may cause equipment damage or threaten the safety of the operator. Therefore, the presence of the pressure relief port 213 is particularly important. When the pressure rises to a certain level, it will automatically open, expelling the internal gas, thereby restoring the internal pressure of the pump liquid chamber to normal, ensuring the normal operation of the equipment and the safety of the operator.

[0046] Referring to Figure 1 On the displacement path of the second piston rod 241, a support protrusion 220 is also provided. The main function of the support protrusion 220 is to limit the possible deviation of the second piston rod 241 during movement, and to provide support to some extent, ensuring that the second piston rod 241 can move smoothly. In this way, additional wear caused by deviation can be effectively reduced, prolonging the service life of the equipment.

[0047] Referring to Figure 3Further, the connecting rod 135 is connected to the surface of the rotating disc 132 by a hinged manner. This hinged manner makes the connecting rod 135 freely rotate on the surface of the rotating disc 132. It is worth noting that the hinged position of the connecting rod 135 and the rotating disc 132 is not located at the center point, but is eccentrically arranged. This eccentric arrangement makes the connecting rod 135 generate a certain offset amount during rotation, thereby realizing a specific motion trajectory and power transmission effect.

[0048] In addition, please refer to Figure 2 In order to ensure that the liquid of the working end 200 flows more smoothly, the inlet 211 and the outlet 212 of the working end 200 are both equipped with a one-way valve 230. The one-way valve 230 controls the flow direction of the liquid and ensures that the liquid can only flow in one direction and cannot flow in the opposite direction. Specifically, the flow direction of the one-way valve 230 at the inlet 211 and the outlet 212 is consistent, that is, they both allow the liquid to flow from the inlet 211 to the outlet 212 and prevent the liquid from flowing in the opposite direction. Through the setting of the one-way valve 230, when the second piston body 242 performs the reciprocating pumping operation again, the liquid will not backflow, thereby improving the efficiency and stability of the entire hydraulic system.

[0049] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A reciprocating cryogenic pump structure, characterized in that: The invention comprises a shell (100) having a hollow interior and an inner cavity; the inner cavity comprises a first chamber (111) and a second chamber (112); the first chamber (111) and the second chamber (112) are in communication; the shell (100) is further provided with a working end (200) at one end close to the second chamber (112); the interior of the working end (200) is in communication with the second chamber (112) via a through hole (113) provided on the shell (100); The inner cavity is provided with a first piston mechanism (130); the first piston mechanism (130) is installed through a pair of bearing seats arranged in the first chamber (111) and extends to the second chamber (112); a second piston mechanism (240) is provided inside the working end (200); the first piston mechanism (130) is connected to the second piston mechanism (240) and serves as a power source for the second piston mechanism (240); the working end (200) is provided with a liquid inlet (211) and a liquid outlet (212) respectively communicated with the interior; the liquid inlet (211) and the liquid outlet (212) are used for the entry and discharge of liquid, respectively; A cooling channel (120) is provided between the outside of the housing (100) and the inner wall of the inner cavity; the cooling channel (120) is provided with a cooling liquid inlet (121) and a cooling liquid outlet (122); the cooling liquid inlet (121) and the cooling liquid outlet (122) are connected to the outside of the housing (100) through a pipe (123) so that the cooling liquid can be circulated.

2. A reciprocating cryogenic pump structure according to claim 1, characterized in that: A cooling device (124) is provided on the pipeline (123), and the cooling device (124) is communicated with the pipeline (123); the cooling liquid passes through the pipeline (123) and the cooling device (124) so ​​that the cooling liquid returns to a normal operating temperature.

3. The reciprocating cryogenic pump structure according to claim 1, characterized in that: The first piston mechanism (130) comprises a rotating shaft (131) and a rotating disk (132) arranged on the rotating shaft (131); both ends of the rotating shaft (131) are mounted via a pair of bearing seats; the rotating disk (132) is fixedly connected to the rotating shaft (131); one end of the rotating shaft (131) extends out of the exterior of the housing (100) for connection with a driving device.

4. The reciprocating cryogenic pump structure according to claim 3, characterized in that: The first piston mechanism (130) further comprises a first piston body (133) and a first piston rod (134); the first piston body (133) is disposed in the second chamber (112) and slides in the second chamber (112); the turntable (132) is hinged to the first piston body (133) via a connecting rod (135).

5. The reciprocating cryogenic pump structure according to claim 4, characterized in that: The second piston mechanism (240) comprises a second piston rod (241) and a second piston body (242); the second piston rod (241) is fixedly connected to the second piston body (242); the second piston rod (241) passes through the through hole (113) and is fixedly connected to the first piston rod (134).

6. The reciprocating cryogenic pump structure according to claim 5, characterized in that: The first piston mechanism (130) is driven by a driving device to drive the second piston mechanism (240) to move, and the second piston body (242) slides inside the working end (200) to achieve the suction or discharge of liquid.

7. The reciprocating cryogenic pump structure according to claim 1, characterized in that: The working end (200) is further provided with a pressure relief port (213) communicating with the interior. When the internal liquid of the working end (200) is heated and vaporized, the pressure increases, and the pressure is released by opening the pressure relief port (213).

8. The reciprocating cryogenic pump structure according to claim 1, characterized in that: The working end (200) is further provided with a supporting protrusion (220) on the displacement path of the second piston rod (241); the supporting protrusion (220) is used to limit the deviation of the second piston rod (241) and support the second piston rod (241).

9. The reciprocating cryogenic pump structure according to claim 4, characterized in that: The connecting rod (135) is hinged to the surface of the rotating disk (132); the hinge position of the connecting rod (135) and the rotating disk (132) is eccentrically arranged.

10. The reciprocating cryogenic pump structure according to claim 1, characterized in that: A one-way valve (230) is provided at both the liquid inlet (211) and the liquid outlet (212) of the working end (200), and the flow directions of the one-way valves (230) at the liquid inlet (211) and the liquid outlet (212) are consistent.

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