Reciprocating pump for cryogenic medium

Abstract

The invention provides a reciprocating pump for a cryogenic medium, comprising: an outer container comprising an outer cylinder and an outer convex seal head arranged at one end of the outer cylinder, the outer convex seal head being provided with an outer mounting port; the inner container is arranged in the outer container, the inner container comprises an inner cylinder and an inner convex seal head arranged at one end of the inner cylinder, and an inner mounting opening is formed in the inner convex seal head; the sleeve assembly comprises an inner sleeve and an outer sleeve arranged on the outer side of the inner sleeve in a sleeving mode, the first end of the inner sleeve is connected with the inner installation opening, the first end of the outer sleeve is connected with the outer installation opening, and an inner and outer sleeve connecting piece is connected between the second end of the inner sleeve and the second end of the outer sleeve in a sealed mode. Communicated vacuum heat insulation cavities are formed between the inner container and the outer container and between the inner sleeve and the outer sleeve; one end of the fluid end structure extends into the inner container through the inner mounting opening, and the other end of the fluid end structure is detachably connected with the inner and outer sleeve connecting piece. According to the invention, the fluid end structure can be repeatedly disassembled without damaging the vacuum structure, and the working pressure can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cryogenic pressure vessels, and in particular relates to a reciprocating pump for cryogenic media. Background Art

[0002] With the development of new energy in the country, hydrogen energy has attracted much attention as a clean energy. Compared with high-pressure hydrogen, liquid hydrogen has the advantages of low pressure, easy transportation, and high energy density. The advantages of liquid hydrogen in production, storage, and transportation are more suitable for large-scale and commercial supply of hydrogen energy, which can effectively control the overall cost, and there are no complex unsafe factors involved in the transportation process.

[0003] A liquid hydrogen reciprocating pump is a cryogenic pressure vessel that compresses liquid hydrogen to a high pressure state and then transports it using a reciprocating piston. After the liquid hydrogen enters the pump body, the reciprocating motion of the piston compresses the liquid hydrogen to a high pressure state and then transports it to where it is needed through the outlet pipe.

[0004] How to make the hydraulic end of the liquid hydrogen reciprocating pump repeatedly disassembled without damaging the vacuum structure during the filling and transportation of high, medium and low pressure cryogenic media is an effective means to further control costs.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome at least some of the shortcomings of the prior art and provide a reciprocating pump for cryogenic media. By utilizing a sleeve assembly to isolate the vacuum structure between inner and outer containers from the inner container for installing the hydraulic end structure, and connecting the sleeve assembly to the convex heads of the inner container and the outer container, not only can the hydraulic end structure and the sleeve assembly be repeatedly disassembled without destroying the vacuum structure, but also the pressure-bearing capacity of the inner and outer containers can be improved, thereby increasing the working pressure of the reciprocating pump and enabling it to be used for the transportation of high-pressure cryogenic media.

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0008] A reciprocating pump for cryogenic media, comprising:

[0009] The outer container comprises an outer cylinder and an outward convex sealing head arranged at one end of the outer cylinder, wherein the outward convex sealing head is provided with an outer mounting opening;

[0010] An inner container is arranged inside the outer container, the inner container comprises an inner cylinder and an inward convex head arranged at one end of the inner cylinder, the inward convex head is provided with an inner mounting opening;

[0011] A sleeve assembly, comprising an inner sleeve and an outer sleeve sleeved outside the inner sleeve, wherein a first end of the inner sleeve is connected to the inner mounting port, a first end of the outer sleeve is connected to the outer mounting port, and an inner and outer sleeve connector is sealedly connected between a second end of the inner sleeve and a second end of the outer sleeve, so that a communicating vacuum insulation cavity is formed between the inner container and the outer container, and between the inner sleeve and the outer sleeve;

[0012] The hydraulic end structure has one end extending into the interior of the inner container through the inner mounting opening, and the other end being detachably connected to the inner and outer sleeve connector.

[0013] In some embodiments, the liquid end structure includes:

[0014] A hydraulic end mounting cover is detachably connected to the inner and outer sleeve connectors;

[0015] Executing agencies include:

[0016] A piston sleeve assembly, one end of which is located in the inner container and the other end of which is detachably connected to the hydraulic end mounting cover;

[0017] A liquid inlet assembly, connected to the bottom of the piston sleeve assembly;

[0018] A liquid outlet assembly, wherein the liquid inlet end of the liquid outlet mechanism is connected to the bottom of the piston sleeve assembly, and the liquid outlet end of the liquid outlet mechanism sealably extends out of the outside of the liquid end mounting cover through a first reserved hole reserved on the liquid end mounting cover.

[0019] In some embodiments, the piston-sleeve assembly includes:

[0020] A hydraulic end connecting tube, a first end of which is detachably connected to the hydraulic end mounting cover;

[0021] A cylinder barrel is detachably connected to the second end of the hydraulic end connecting barrel, and a liquid inlet and a liquid outlet are provided at the bottom of the cylinder barrel, which are respectively connected to the liquid inlet assembly and the liquid outlet assembly;

[0022] The hydraulic end shaft head is reciprocatingly arranged in the hydraulic end connecting cylinder, one end of the hydraulic end shaft head extends out of the outside of the hydraulic end mounting cover through a second reserved hole reserved on the hydraulic end mounting cover and is connected to the power end structure, and the other end of the hydraulic end shaft head is detachably connected to a piston that reciprocates in the cylinder.

[0023] In some embodiments, a liquid outlet valve cavity corresponding to the liquid outlet is provided on the outer side of the bottom of the cylinder;

[0024] Wherein, the liquid outlet assembly comprises a liquid outlet valve, a liquid outlet pipe adapter and a liquid outlet pipe;

[0025] The liquid outlet valve is arranged in the liquid outlet valve cavity and is used to open and close the liquid outlet;

[0026] One end of the liquid outlet pipe adapter is detachably connected to the liquid outlet valve chamber, and the other end is connected to the liquid outlet pipe;

[0027] The liquid outlet end of the liquid outlet pipe extends out of the outside of the hydraulic end mounting cover in a sealed manner through the first reserved hole.

[0028] In some embodiments, a portion of the liquid outlet end of the liquid outlet pipe located outside the hydraulic end mounting cover is connected to a labyrinth thermal bridge structure.

[0029] In some embodiments, the liquid outlet tube is arranged in the inner container around the piston sleeve assembly.

[0030] In some embodiments, the first end of the fluid end connection barrel is detachably connected to the inner side of the fluid end mounting cover;

[0031] Wherein, a sealing sleeve is sandwiched between one end of the hydraulic end shaft head and the second reserved hole on the hydraulic end mounting cover, and the inner side wall of the sealing sleeve is provided with a plurality of annular grooves, and annular sealing rings are embedded in the plurality of annular grooves.

[0032] In some embodiments, the outer side of the first end of the hydraulic end connecting tube is formed into an annular shoulder, and the annular shoulder is provided with a plurality of mounting blind holes along the circumference;

[0033] The hydraulic end mounting cover is provided with a plurality of mounting through holes corresponding to the plurality of mounting blind holes;

[0034] A sealing screw is connected between the plurality of mounting through holes and the plurality of mounting blind holes so that the first end of the hydraulic end connecting tube is detachably connected to the inner side of the hydraulic end mounting cover.

[0035] In some embodiments, a thermal insulation pad is disposed on the inner side of the hydraulic end mounting cover, and the thermal insulation pad extends between the hydraulic end mounting cover and the inner and outer sleeve connector.

[0036] In some embodiments, the liquid inlet assembly includes a liquid inlet valve and an internal liquid inlet tube;

[0037] Wherein, the liquid inlet valve is used to open and close the liquid inlet, one end of the internal liquid inlet pipe is connected to the liquid inlet, and the other end extends to the bottom of the inner container.

[0038] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0039] 1. The reciprocating pump for cryogenic media provided by the present invention utilizes a sleeve assembly to isolate the vacuum structure between the inner and outer containers from the inner container for installing the hydraulic end structure, and connects the sleeve assembly to the convex heads of the inner container and the outer container. Not only can the hydraulic end structure and the sleeve assembly be repeatedly disassembled without destroying the vacuum structure, but also the pressure bearing capacity of the inner and outer containers can be improved, thereby increasing the working pressure of the reciprocating pump, so that it can be used for the transportation of high-pressure cryogenic media.

[0040] 2. The reciprocating pump for cryogenic media provided by the present invention, by detachably arranging the hydraulic end connecting cylinder for providing reciprocating motion space for the shaft head on the inner side of the hydraulic end mounting cover, and arranging a thermal insulation pad on the inner side of the hydraulic end mounting cover, is not only conducive to the manufacture of various components, but also reduces the heat leakage generated by the hydraulic end connecting cylinder.

[0041] 3. The reciprocating pump for cryogenic medium provided by the present invention increases the length of the liquid outlet pipe in the cryogenic medium by arranging the liquid outlet pipe around the piston sleeve assembly in the inner container, which is beneficial to alleviate the stress caused by thermal expansion and contraction of the liquid outlet pipe and reduce the amount of vaporization of the cryogenic liquid.

[0042] 4. The reciprocating pump for cryogenic media provided by the present invention uses a sealing sleeve to thermally seal and connect one end of the hydraulic end shaft head with the second reserved hole on the hydraulic end mounting cover, which not only ensures the reciprocating motion of the hydraulic end shaft head but also reduces heat leakage.

[0043] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0045] Figure 1 is a schematic structural diagram of a reciprocating pump for cryogenic medium provided according to an exemplary embodiment of the present invention;

[0046] Figure 2 yes Figure 1 A partial enlarged view of the structure in the middle;

[0047] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle structure.

[0048] In the figure: 100, reciprocating pump;

[0049] 110, outer container; 111, outer cylinder; 112, outer convex head; 113, base; 114, shell bursting disc; 115, fixed pipe; 116, vacuum structure;

[0050] 120, inner container; 121, inner cylinder; 122, inner convex head; 123, insulation layer; 124, external liquid inlet pipe; 125, bottom support member;

[0051] 130, sleeve assembly; 131, inner sleeve; 132, outer sleeve; 133, inner and outer sleeve connector;

[0052] 140. Fluid end structure; 141. Fluid end mounting cover; 142. Actuator; 1421. Piston sleeve assembly; 14211. Fluid end connecting tube; 14212. Cylinder; 14213. Fluid end shaft head; 14214. Piston; 14215. Liquid outlet valve cavity; 1422. Liquid inlet assembly; 14221. Liquid inlet valve; 14222. Internal liquid inlet pipe; 1423. Liquid outlet assembly; 14231. Liquid outlet valve; 14232. Liquid outlet pipe adapter; 14233. Liquid outlet pipe; 143. Sealing pad; 144. Sealing sleeve; 145. Annular sealing ring; 146. Thermal insulation pad;

[0053] 150. Power end structure;

[0054] 160. Vacuum insulation chamber; 161. Room temperature getter; 162. Molecular sieve;

[0055] 170. Pressurization and deflation safety valve interface.

[0056] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0058] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] Figure 1 is a schematic structural diagram of a reciprocating pump 100 for cryogenic media according to an exemplary embodiment of the present invention, Figure 2 yes Figure 1 A partial enlarged view of the structure in the middle. Figure 3 yes Figure 1 A partial enlarged view of the structure at B. The cryogenic medium is, for example, liquid hydrogen, liquid nitrogen, etc.

[0061] like Figure 1 As shown, the reciprocating pump 100 includes an outer container 110 , an inner container 120 , a sleeve assembly 130 and a liquid end structure 140 .

[0062] Among them, the outer container 110 includes an outer cylinder 111, one end of the outer cylinder 111 is welded to an outer convex head 112, and the other end is welded to a base 113 to form a storage space. The outer convex head 112 is provided with an external installation port. The inner container 120 is arranged in the storage space inside the outer container 110, and the inner container 120 includes an inner cylinder 121 and two inner convex heads 122 welded to the two ends of the inner cylinder 121, forming a hydraulic end structure 140 for installing the reciprocating pump 100 and a pump pool for containing cryogenic medium. An inner installation port is provided on one of the inner convex heads 122 on the same side as the outer convex head 112. An insulating layer 123 is wrapped and connected on the outer wall of the inner container 120 to reduce heat leakage of the inner container 120.

[0063] like Figure 2 As shown, the sleeve assembly 130 includes an inner sleeve 131 and an outer sleeve 132 sleeved outside the inner sleeve 131, the first end of the inner sleeve 131 is welded to the inner mounting port, the first end of the outer sleeve 132 is welded to the outer mounting port, and an inner and outer sleeve connector 133 is welded between the second end of the inner sleeve 131 and the second end of the outer sleeve 132, so that a communicating vacuum insulation chamber 160 is formed between the inner container 120 and the outer container 110, and between the inner sleeve 131 and the outer sleeve 132. One end of the hydraulic end structure 140 extends into the inner container 120 through the inner mounting port, and the other end is detachably connected to the inner and outer sleeve connector 133.

[0064] In the above scheme, the vacuum structure between the inner and outer containers 110 of the reciprocating pump 100 is isolated from the inner container 120 for installing the hydraulic end structure 140 by using the sleeve assembly 130, and the hydraulic end structure 140 is detachably connected to the inner and outer sleeve connector 133. When the hydraulic end structure 140 needs to be removed from the reciprocating pump 100, the hydraulic end structure 140 can be directly separated from the inner and outer sleeve connector 133 without destroying the vacuum structure between the inner and outer containers 110. Moreover, the present invention uses the sleeve assembly 130 to extend the inner and outer sleeve connector 133 detachably connected to the hydraulic end structure 140 outward, so that the inner container 120 and the outer container can use a convex head, which can improve the pressure bearing capacity of the inner and outer containers 110, thereby improving the working pressure of the reciprocating pump 100, so that it can be used for the transportation of high-pressure cryogenic media.

[0065] Furthermore, a room temperature getter 161 and a molecular sieve 162 are provided in the vacuum insulation chamber 160 between the inner container 120 and the outer container 110, which are used to absorb the outgassing of the materials in the vacuum insulation chamber 160 and the gas leaking into the space, improve the vacuum degree, and maintain the vacuum degree requirements of the equipment. A vacuum pumping structure 116 is also connected to the outer convex head 112 of the outer container 110, which is used to make the vacuum degree in the vacuum insulation chamber 160 meet the equipment requirements.

[0066] In addition, a shell bursting disc 114 is connected to the outer convex head 112 of the outer container 110 to improve the safety of the reciprocating pump 100 .

[0067] The inner container 120 is also connected to an external liquid inlet pipe 124 for inputting a low-pressure cryogenic medium into the inner container 120. As an example, the external liquid inlet pipe 124 is connected to another inner convex end cap of the inner container 120, and the external liquid inlet pipe 124 is a rotary structure located at the bottom of the vacuum insulation chamber 160, which is used to absorb the upward contraction of the inner container 120 and the contraction deformation of the external liquid inlet pipe 124 itself.

[0068] In some embodiments, the portion of the liquid inlet end of the external liquid inlet pipe 124 located outside the outer container 110 is connected to a labyrinth thermal bridge structure for thermal insulation, thereby reducing heat leakage of the external liquid inlet pipe 124 .

[0069] In some embodiments, a bottom support 125 and a fixed tube 115 are provided between another inner convex end cap of the inner container 120 and the base 113, wherein the bottom support 125 is connected to the inner convex end cap of the inner container 120, the fixed tube 115 is connected to the base 113, and the bottom support 125 is sleeved inside the fixed tube 115. When the inner container 120 is filled with a cryogenic medium, the inner container 120 shrinks upward, detaches from the bottom support 125, cuts off the heat transfer path, and reduces heat leakage. The base 113 is fixed to the mounting surface of the reciprocating pump 100 by bolts, and is used to withstand the various forces during the operation of the reciprocating pump 100.

[0070] It should be noted that, in a non-working state, the bottom support member 125 at the bottom of the inner container 120 is bonded to the base 113 by an adhesive.

[0071] In some embodiments, the hydraulic end structure 140 includes a hydraulic end mounting cover 141 and an actuator 142. The hydraulic end mounting cover 141 is used to be detachably connected to the inner and outer sleeve connector 133. Preferably, the inner and outer sleeve connector 133 is flange-connected to the hydraulic end mounting cover 141, and a sealing gasket 143 is provided between the two.

[0072] like Figure 3 As shown, the actuator 142 includes a piston sleeve assembly 1421, a liquid inlet assembly 1422 and a liquid outlet assembly 1423, one end of the piston sleeve assembly 1421 is located in the inner container 120, and the other end is detachably connected to the hydraulic end mounting cover 141, the liquid inlet assembly 1422 is connected to the bottom of the piston sleeve assembly 1421, the liquid inlet end of the liquid outlet assembly 1423 is connected to the bottom of the piston sleeve assembly 1421, and the liquid outlet end of the liquid outlet assembly 1423 extends out of the hydraulic end mounting cover 141 in a sealed manner through a first reserved hole reserved on the hydraulic end mounting cover 141.

[0073] In the above solution, the hydraulic end actuator 142 is integrally connected to the hydraulic end mounting cover 141 , so that the hydraulic end structure 140 can be removed from the reciprocating pump 100 as a whole.

[0074] Furthermore, the piston sleeve assembly 1421 includes a hydraulic end connecting tube 14211, a cylinder 14212 and a hydraulic end shaft head 14213. The first end of the hydraulic end connecting tube 14211 is detachably connected to the hydraulic end mounting cover 141; the cylinder 14212 is detachably connected to the second end of the hydraulic end connecting tube 14211; the bottom of the cylinder 14212 is provided with a liquid inlet and a liquid outlet, which are respectively connected to the liquid inlet assembly 1422 and the liquid outlet. The hydraulic end shaft head 14213 is reciprocatingly arranged in the hydraulic end connecting tube 14211, one end of the hydraulic end shaft head 14213 extends out of the hydraulic end mounting cover 141 through a second reserved hole reserved on the hydraulic end mounting cover 141 and is connected to the power end structure 150, and the other end of the hydraulic end shaft head 14213 is detachably connected to a piston 14214 that reciprocates in the cylinder 14212. As an example, the power end structure 150 can be a hydraulic drive structure or a motor drive structure to provide the required power for the hydraulic end of the reciprocating pump 100. The other end of the hydraulic end shaft head 14213 is threadedly connected to the piston 14214.

[0075] In the above solution, the components of the hydraulic end actuator 142 are configured in a detachable connection mode, which facilitates the processing of the components and reduces the processing cost.

[0076] As an example, the first end of the hydraulic end connecting cylinder 14211 is detachably connected to the inner side of the hydraulic end mounting cover 141; wherein, a sealing sleeve 144 is sandwiched between one end of the hydraulic end shaft head 14213 and the second reserved hole on the hydraulic end mounting cover 141, and the inner side wall of the sealing sleeve 144 is provided with a plurality of annular grooves, and annular sealing rings 145 are embedded in the plurality of annular grooves.

[0077] In the above scheme, since the hydraulic end connecting cylinder 14211 is in direct contact with the cryogenic medium, the heat leakage generated by the hydraulic end connecting cylinder 14211 is also relatively large. The present invention detachably connects the first end of the hydraulic end connecting cylinder 14211 to the inner side of the hydraulic end mounting cover 141, which can reduce the heat leakage generated by the hydraulic end connecting cylinder 14211. Based on this, the hydraulic end shaft head 14213 needs to pass through the hydraulic end mounting cover 141 and reciprocate up and down relative to the hydraulic end mounting cover 141. The present invention realizes the purpose that the hydraulic end shaft head 14213 needs to pass through the hydraulic end mounting cover 141 and reciprocate up and down relative to the hydraulic end mounting cover 141 by combining the sealing sleeve 144 with the annular sealing ring 145.

[0078] Furthermore, the outer side of the first end of the hydraulic end connection tube 14211 is formed into an annular shoulder, and the annular shoulder is provided with a plurality of mounting blind holes along the circumferential direction; the hydraulic end mounting cover 141 is provided with a plurality of mounting through holes corresponding to the plurality of mounting blind holes; and a sealing screw is connected between the plurality of mounting through holes and the plurality of mounting blind holes, so that the first end of the hydraulic end connection tube 14211 is detachably connected to the inner side of the hydraulic end mounting cover 141. In addition, a thermal insulation pad 146 is provided on the inner side of the hydraulic end mounting cover 141, and the thermal insulation pad 146 extends between the hydraulic end mounting cover 141 and the inner and outer sleeve connector 133, thereby ensuring that the hydraulic end actuator 142 and the hydraulic end mounting cover 141 are separated by thermal insulation material to reduce heat leakage. The thermal insulation pad 146 can be made of non-metallic material.

[0079] In addition, the second end of the hydraulic end connecting tube 14211 is connected to the top flange of the cylinder tube 14212 .

[0080] Furthermore, a liquid outlet valve cavity 14215 corresponding to the liquid outlet is provided on the outer side of the bottom of the cylinder 14212; wherein the liquid outlet assembly 1423 includes a liquid outlet valve 14231, a liquid outlet pipe adapter 14232 and a liquid outlet pipe 14233; the liquid outlet valve 14231 is arranged in the liquid outlet valve cavity 14215, and is used to open and close the liquid outlet; one end of the liquid outlet pipe adapter 14232 is detachably connected to the liquid outlet valve cavity 14215, and the other end is connected to the liquid outlet pipe 14233; the liquid outlet end of the liquid outlet pipe 14233 is sealedly extended out of the outside of the hydraulic end mounting cover 141 through the first reserved hole.

[0081] As an example, one end of the liquid outlet pipe adapter 14232 is flange-connected to the liquid outlet valve chamber 14215 .

[0082] Furthermore, the liquid outlet pipe 14233 is arranged around the piston sleeve assembly 1421 in the inner container 120. This is not only conducive to alleviating the stress caused by thermal expansion and contraction of the liquid outlet pipe 14233, but also can increase the length of the liquid outlet pipe 14233 in the cryogenic medium and reduce the amount of cryogenic liquid vaporization. Optionally, the liquid outlet pipe 14233 includes multiple sections of liquid outlet pipes connected in sequence, and the multiple sections of liquid outlet pipes are arranged around the piston sleeve assembly 1421 in the inner container 120.

[0083] In some embodiments, the liquid inlet component 1422 includes a liquid inlet valve 14221 and an internal liquid inlet pipe 14222; wherein, the liquid inlet valve 14221 is used to open and close the liquid inlet, one end of the internal liquid inlet pipe 14222 is connected to the liquid inlet, and the other end extends to the bottom of the inner container 120.

[0084] When the reciprocating pump 100 is working, driven by the power end structure 150, the hydraulic end shaft head 14213 performs linear reciprocating motion along the cylinder 14212, and the stroke and frequency of the piston 14214 are controlled by the power end structure 150. When the piston 14214 moves upward, the pressure inside the cylinder 14212 decreases, the liquid inlet valve 14221 opens, and the cryogenic medium enters the cylinder 14212. The piston 14214 moves downward, and the pressure increases. Under the action of pressure, the liquid inlet valve 14221 closes, the liquid outlet valve 14231 opens, and the cryogenic medium enters the liquid outlet pipe 14233, thereby achieving the purpose of supplying the cryogenic medium with the set pressure to the user.

[0085] In some embodiments, the portion of the liquid outlet end of the liquid outlet pipe 14233 located outside the hydraulic end mounting cover 141 is connected to a labyrinth thermal bridge structure for thermal insulation, thereby reducing heat leakage of the liquid outlet pipe 14233 .

[0086] It should be noted that the reciprocating pump 100 also includes other process pipes and instruments, the caliber and quantity of which are set as required. Among them, the instrument interface of the pressure and liquid level required by the equipment and the pressure relief safety valve interface 170 can be led out from the hydraulic end mounting cover 141.

[0087] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A reciprocating pump for cryogenic media, characterized in that: include: The outer container comprises an outer cylinder and an outward convex sealing head arranged at one end of the outer cylinder, wherein the outward convex sealing head is provided with an outer mounting opening; An inner container is arranged inside the outer container, the inner container comprises an inner cylinder and an inward convex head arranged at one end of the inner cylinder, the inward convex head is provided with an inner mounting opening; A sleeve assembly, comprising an inner sleeve and an outer sleeve sleeved outside the inner sleeve, wherein a first end of the inner sleeve is connected to the inner mounting port, a first end of the outer sleeve is connected to the outer mounting port, and an inner and outer sleeve connector is sealedly connected between a second end of the inner sleeve and a second end of the outer sleeve, so that a communicating vacuum insulation cavity is formed between the inner container and the outer container, and between the inner sleeve and the outer sleeve; The hydraulic end structure has one end extending into the interior of the inner container through the inner mounting opening, and the other end being detachably connected to the inner and outer sleeve connector.

2. The reciprocating pump for cryogenic medium according to claim 1, characterized in that: The hydraulic end structure comprises: A hydraulic end mounting cover is detachably connected to the inner and outer sleeve connectors; Executing agencies include: A piston sleeve assembly, one end of which is located in the inner container and the other end of which is detachably connected to the hydraulic end mounting cover; A liquid inlet assembly, connected to the bottom of the piston sleeve assembly; A liquid outlet assembly, wherein the liquid inlet end of the liquid outlet mechanism is connected to the bottom of the piston sleeve assembly, and the liquid outlet end of the liquid outlet mechanism sealably extends out of the outside of the liquid end mounting cover through a first reserved hole reserved on the liquid end mounting cover.

3. The reciprocating pump for cryogenic medium according to claim 2, characterized in that: The piston sleeve assembly comprises: A hydraulic end connecting tube, a first end of which is detachably connected to the hydraulic end mounting cover; A cylinder barrel is detachably connected to the second end of the hydraulic end connecting barrel, and a liquid inlet and a liquid outlet are provided at the bottom of the cylinder barrel, which are respectively connected to the liquid inlet assembly and the liquid outlet assembly; The hydraulic end shaft head is reciprocatingly arranged in the hydraulic end connecting cylinder, one end of the hydraulic end shaft head extends out of the outside of the hydraulic end mounting cover through a second reserved hole reserved on the hydraulic end mounting cover and is connected to the power end structure, and the other end of the hydraulic end shaft head is detachably connected to a piston that reciprocates in the cylinder.

4. The reciprocating pump for cryogenic medium according to claim 3, characterized in that: The outer side of the bottom of the cylinder is provided with a liquid outlet valve cavity corresponding to the liquid outlet; Wherein, the liquid outlet assembly comprises a liquid outlet valve, a liquid outlet pipe adapter and a liquid outlet pipe; The liquid outlet valve is arranged in the liquid outlet valve cavity and is used to open and close the liquid outlet; One end of the liquid outlet pipe adapter is detachably connected to the liquid outlet valve chamber, and the other end is connected to the liquid outlet pipe; The liquid outlet end of the liquid outlet pipe extends out of the outside of the hydraulic end mounting cover in a sealed manner through the first reserved hole.

5. The reciprocating pump for cryogenic medium according to claim 4, characterized in that: The portion of the liquid outlet end of the liquid outlet pipe located outside the hydraulic end mounting cover is connected with a labyrinth thermal bridge structure.

6. The reciprocating pump for cryogenic medium according to claim 4, characterized in that: The liquid outlet pipe is arranged in the inner container around the piston sleeve assembly.

7. The reciprocating pump for cryogenic medium according to claim 3, characterized in that: The first end of the hydraulic end connecting tube is detachably connected to the inner side of the hydraulic end mounting cover; Wherein, a sealing sleeve is sandwiched between one end of the hydraulic end shaft head and the second reserved hole on the hydraulic end mounting cover, and the inner side wall of the sealing sleeve is provided with a plurality of annular grooves, and annular sealing rings are embedded in the plurality of annular grooves.

8. The reciprocating pump for cryogenic medium according to claim 7, characterized in that: The outer side of the first end of the hydraulic end connecting tube is formed into an annular shoulder, and the annular shoulder is provided with a plurality of mounting blind holes along the circumference; The hydraulic end mounting cover is provided with a plurality of mounting through holes corresponding to the plurality of mounting blind holes; A sealing screw is connected between the plurality of mounting through holes and the plurality of mounting blind holes so that the first end of the hydraulic end connecting tube is detachably connected to the inner side of the hydraulic end mounting cover.

9. The reciprocating pump for cryogenic medium according to claim 7, characterized in that: A heat insulation pad is arranged on the inner side of the hydraulic end mounting cover, and the heat insulation pad extends between the hydraulic end mounting cover and the inner and outer sleeve connectors.

10. The reciprocating pump for cryogenic media according to any one of claims 3 to 9, characterized in that: The liquid inlet assembly comprises a liquid inlet valve and an internal liquid inlet pipe; Wherein, the liquid inlet valve is used to open and close the liquid inlet, one end of the internal liquid inlet pipe is connected to the liquid inlet, and the other end extends to the bottom of the inner container.

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