Deep sea single-action piston pump based on paraffin phase change driving

Abstract

The invention provides a paraffin phase change driving-based deep sea single-action piston pump. The paraffin phase change driving-based deep sea single-action piston pump comprises a driving module, a piston module and a pump body module, the driving module comprises a heating rod, a ceramic end cover, a foamy copper-paraffin phase change unit and a silica gel shell; the piston module comprises a small piston and a large piston at two ends of the threaded rod; the pump body module comprises a top end cover, a small cylinder barrel, an upper connecting cover, a large cylinder barrel and a lower connecting cover; the driving module and the small piston are located in a through hole in the center of the small cylinder barrel. The large piston is located in a through hole in the center of the large cylinder barrel, and a reset spring is installed between the large piston and the lower connecting cover. A pressure balance hole is formed in the upper connecting cover; the lower connecting cover is provided with a groove, the two sides of the lower connecting cover are each provided with a threaded hole, and each threaded hole is provided with a thin film one-way valve. The piston pump generates volume increment through paraffin phase change to provide linear output, and the requirement for a small hydraulic power source of the deep-sea robot can be met.

Description

Technical Field

[0001] The present invention relates to the technical fields of phase change material applications and deep - sea hydraulic pumps. Specifically, it particularly relates to a deep - sea single - acting piston pump driven by paraffin phase change. Background Art

[0002] With the gradual in - depth development of deep - sea exploration equipment and technology, hydraulic pumps in deep - sea operation equipment are an essential and indispensable part, which can achieve stable hydraulic flow output to meet different requirements of deep - sea operations. Currently, most existing deep - sea hydraulic pumps are driven by motors. In the driving environment of high pressure in the deep sea, the inside of the motor needs to be filled with oil and sealed to achieve normal operation. Their volume and mass are usually large and difficult to effectively reduce. At the same time, seawater leakage caused by sealing problems also makes the motor have a certain risk of failure. Summary of the Invention

[0003] In view of the above - mentioned technical problem that the volume and mass of existing deep - sea hydraulic pumps are large, a deep - sea single - acting piston pump driven by paraffin phase change is provided to meet the demand for a miniaturized hydraulic power source for deep - sea robots. The piston pump provides a linear output through the volume increment generated by paraffin phase change. This linear output uses an internal flow - increasing piston pump structure to amplify the output flow, while displacing the liquid inside the cavity and outputting hydraulic energy.

[0004] The technical means adopted by the present invention are as follows:

[0005] A deep - sea single - acting piston pump driven by paraffin phase change, comprising a driving module, a piston module, and a pump body module;

[0006] The driving module includes a heating rod, a ceramic end - cap, a copper foam - paraffin phase - change unit, and a silica gel housing; the heating rod includes a heating part and a wire; the copper foam - paraffin phase - change unit includes a copper foam layer coated and fixed outside the heating part and a paraffin layer located outside the copper foam layer; the silica gel housing is coated outside the copper foam - paraffin phase - change unit; the ceramic end - cap is provided with a circular through - hole for the wire to pass through, and the circular through - hole is sealed with silicone rubber glue; the ceramic end - cap is tightly adhesively fixed to the top opening of the silica gel housing;

[0007] The piston module includes a small piston and a large piston threadedly installed at both ends of a threaded rod;

[0008] The pump body module includes a top cover, a small cylinder barrel, an upper connection cover, a large cylinder barrel, and a lower connection cover fixedly connected in sequence from top to bottom;

[0009] The small cylinder barrel, the upper connection cover, and the large cylinder barrel are all provided with through - holes penetrating the upper and lower end faces at their centers;

[0010] The driving module and the small piston are located inside the through hole at the center of the small cylinder barrel. The driving module is located above the small piston, and the wire of the heating rod extends out through the wire outlet at the center of the top end cover.

[0011] The large piston is located inside the through hole at the center of the large cylinder barrel, and a return spring is installed between the large piston and the lower connection cover.

[0012] The threaded rod is located inside the through hole at the center of the upper connection cover.

[0013] A pressure balance hole communicating with the through hole at the center of the upper connection cover is provided on the side of the upper connection cover.

[0014] A groove communicating with the through hole at the center of the large cylinder barrel is provided at the center of the lower connection cover. A threaded hole communicating with the groove is respectively provided on both sides of the lower connection cover. Each threaded hole is respectively installed with a membrane check valve through threaded connection. The two threaded holes serve as the water inlet and the water outlet of the piston pump respectively.

[0015] Further, two circumferential annular grooves are respectively provided on the outer sides of the small piston and the large piston in the circumferential direction. A circular dynamic seal ring I is installed in each annular groove of the small piston, and a circular dynamic seal ring II is installed in each annular groove of the large piston.

[0016] Further, threaded holes for installing the threaded rod are respectively provided at the bottom of the small piston and the top of the large piston.

[0017] Further, a guide sleeve is sleeved outside the threaded rod.

[0018] Further, annular bosses are respectively provided at the upper and lower ends of the upper connection cover and the upper end of the lower connection cover.

[0019] Internal threads are provided at the lower part of the top end cover, and internal threads are provided on the annular boss at the upper end of the upper connection cover. The small cylinder barrel is respectively threadedly connected with the top end cover and the annular boss at the upper end of the upper connection cover through the external threads provided at both ends.

[0020] External threads are respectively provided on the annular bosses at the lower end of the upper connection cover and the upper end of the lower connection cover. The large cylinder barrel is respectively threadedly connected with the annular boss at the lower end of the upper connection cover and the annular boss at the upper end of the lower connection cover through the internal threads provided at both ends.

[0021] Further, the pump body module further includes a fixed pull rod for fixedly connecting the upper connection cover and the lower connection cover.

[0022] Furthermore, the upper connecting cover and the lower connecting cover are connected by four fixed tie rods. Circular through holes for installing the fixed tie rods are provided at the four corners of the upper connecting cover and the lower connecting cover. After the fixed tie rods pass through the circular through holes, nuts are used for fastening.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. The deep-sea single-acting piston pump based on paraffin phase change drive provided by the present invention adopts a new drive mode. The driving force generated by the paraffin phase change is used to push the piston to output flow externally. The raw materials are easily available and the cost is low. The driving effect can be obtained by heating with a heating rod, and the driving mode is simple.

[0025] 2. For the deep-sea single-acting piston pump based on paraffin phase change drive provided by the present invention, the volume change amount of the paraffin phase change can reach 17%, and the liquid paraffin has a small volume compression ratio in the deep-sea environment. The present invention can generate a large force and fluid pressure in a small volume, and has the function of automatic recovery. It is expected to replace the electro-hydraulic pump to provide hydraulic energy for deep-sea robots, which is beneficial to the miniaturization and lightweight design of deep-sea hydraulic pumps.

[0026] 3. The deep-sea single-acting piston pump based on paraffin phase change drive provided by the present invention has strong deep-sea pressure resistance. The foam metal stone-paraffin phase change drive device can adapt to pressure in the deep sea. At the same time, pressure balance holes are provided on the pump body, which alleviates the situation that the cavity existing in the traditional mechanism is not suitable for high-pressure environments.

[0027] Based on the above reasons, the present invention can be widely promoted in the field of deep-sea hydraulic pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic structural diagram of the piston pump described in the present invention.

[0030] Figure 2 It is a schematic structural diagram of the piston pump described in the present invention.

[0031] Figure 3 It is a schematic internal structure diagram of the piston pump described in the present invention.

[0032] Figure 4 It is a schematic structural diagram of the drive module described in the present invention.

[0033] Figure 5 This is a schematic structural diagram of the piston module of the present invention.

[0034] Figure 6 This is a schematic structural diagram of the pump body module of the present invention.

[0035] In the figure: 1. Driving module; 1-1. Heating rod; 1-2. Ceramic end cap; 1-3. Copper foam - paraffin phase change unit; 1-4. Silicone housing; 2. Piston module; 2-1. Small piston; 2-2. Threaded rod; 2-3. Large piston; 2-4. Circular dynamic seal ring I; 2-5. Guide sleeve; 2-6. Circular dynamic seal ring II; 3. Pump body module; 3-1. Top end cap; 3-2. Small cylinder barrel; 3-3. Upper connecting cover; 3-4. Large cylinder barrel; 3-5. Return spring; 3-6. Lower connecting cover; 3-7. Pressure balance hole; 3-8. Membrane check valve; 3-9. Fixed pull rod. Specific embodiments

[0036] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description. Without contrary explanations, these orientation words do not indicate or imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0041] For ease of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above", etc. can be used here to describe the spatial positional relationships between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "beneath other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0042] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meanings. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0043] Embodiment 1

[0044] As Figures 1 to 6 shown, the present invention provides a deep-sea single-acting piston pump driven by paraffin phase change, which can be used as a hydraulic power source for an underwater robot, and includes a driving module 1, a piston module 2 and a pump body module 3;

[0045] The driving module 1 includes a heating rod 1-1, a ceramic end cover 1-2, a copper foam-paraffin phase change unit 1-3 and a silica gel housing 1-4; the heating rod 1-1 includes a heating part and a wire; the copper foam-paraffin phase change unit 1-3 includes a copper foam layer coated and fixed outside the heating part and a paraffin layer located outside the copper foam layer; the silica gel housing 1-4 is coated outside the copper foam-paraffin phase change unit 1-3; the ceramic end cover 1-2 is provided with a circular through hole for the wire to pass through, and the circular through hole is sealed with silicone rubber glue; the ceramic end cover 1-2 is tightly bonded and fixed to the top opening of the silica gel housing 1-4;

[0046] The piston module 2 includes small pistons 2-1 and a large piston 2-3 threadedly installed at both ends of a threaded rod 2-2;

[0047] The pump body module 3 includes a top cover 3-1, a small cylinder 3-2, an upper connecting cover 3-3, a large cylinder 3-4 and a lower connecting cover 3-6 fixedly connected in sequence from top to bottom;

[0048] The small cylinder 3-2, the upper connecting cover 3-3 and the large cylinder 3-4 are all provided with through holes penetrating the upper and lower end faces at the centers;

[0049] The driving module 1 and the small piston 2-1 are located inside the through hole at the center of the small cylinder 3-2, the driving module 1 is located above the small piston 2-1, and the wire of the heating rod 1-1 extends out through the wire outlet at the center of the top cover 3-1;

[0050] The large piston 2-3 is located inside the through hole at the center of the large cylinder 3-4, and a return spring 3-5 is installed between the large piston 2-3 and the lower connecting cover 3-6;

[0051] The threaded rod 2-2 is located inside the through hole at the center of the upper connecting cover 3-3;

[0052] The side of the upper connecting cover 3-3 is provided with a pressure balance hole 3-7 communicated with the through hole at the center of the upper connecting cover 3-3, which is used to balance the internal and external pressures of the upper connecting cover 3-3 and can relieve the situation that the upper connecting cover 3-3 may have a cavity and is not suitable for a high-pressure environment;

[0053] A groove communicating with the through hole at the center of the large cylinder 3-4 is formed at the center of the lower connection cover 3-6. Threaded holes communicating with the groove are respectively formed on both sides of the lower connection cover 3-6. A film one-way valve 3-8 is installed at each of the threaded holes through threaded connection. The two threaded holes serve as the water inlet and the water outlet of the piston pump respectively.

[0054] Further, two circumferential annular grooves are formed on the outer side surfaces of the small piston 2-1 and the large piston 2-3 in the circumferential direction. A circular dynamic seal ring I 2-4 is installed in each annular groove of the small piston 2-1, and a circular dynamic seal ring II 2-6 is installed in each annular groove of the large piston 2-3.

[0055] Further, threaded holes for installing the threaded rod 2-2 are respectively formed at the bottom of the small piston 2-1 and the top of the large piston 2-3.

[0056] Further, a guide sleeve 2-5 is sleeved outside the threaded rod 2-2 to make up for the gap between the threaded rod 2-2 and the through hole at the center of the upper connection cover 3-3.

[0057] Further, annular bosses are respectively arranged at the upper and lower ends of the upper connection cover 3-3 and the upper end of the lower connection cover 3-6;

[0058] Internal threads are provided at the lower part of the top cover 3-1. Internal threads are provided on the annular boss at the upper end of the upper connection cover 3-1. The small cylinder 3-2 is threadedly connected to the top cover 3-1 and the annular boss at the upper end of the upper connection cover 3-3 respectively through the external threads provided at both ends;

[0059] External threads are respectively provided on the annular boss at the lower end of the upper connection cover 3-3 and the annular boss at the upper end of the lower connection cover 3-6. The large cylinder 3-4 is threadedly connected to the annular boss at the lower end of the upper connection cover 3-1 and the annular boss at the upper end of the lower connection cover 3-6 respectively through the internal threads provided at both ends.

[0060] Further, the pump body module 3 further includes a fixed pull rod 3-9 for fixedly connecting the upper connection cover 3-3 and the lower connection cover 3-6.

[0061] Further, the upper connection cover 3-3 and the lower connection cover 3-6 are connected by four fixed pull rods 3-9. Circular through holes for installing the fixed pull rods 3-9 are respectively formed at the four corners of the upper connection cover 3-3 and the lower connection cover 3-6. After the fixed pull rods 3-9 pass through the circular through holes, nuts are used for fastening.

[0062] The assembly process of the piston pump of the present invention is as follows:

[0063] The copper foam framework is impregnated with paraffin phase change material in the voids of the framework by the vacuum impregnation method. Subsequently, the excess paraffin material is trimmed to form the copper foam - paraffin phase change unit 1 - 3. Then, the silicone rubber housing 1 - 4 is prepared by the mold method and coated outside the copper foam - paraffin phase change unit 1 - 3, and demolded after curing; the wire of the heating rod 1 - 1 is passed through the circular through - hole on the ceramic end - cap 1 - 2 and sealed with silicone rubber glue; the heating part of the heating rod 1 - 1 is inserted into the central hole of the copper foam - paraffin phase change unit 1 - 3, and insulation treatment is carried out with silicone rubber; the silicone rubber housing 1 - 4 is bonded and sealed with the ceramic end - cap 1 - 2 using silicone rubber glue to form the drive module 1;

[0064] A circular dynamic seal ring Ⅰ2 - 4 is sleeved in the annular groove outside the small piston 2 - 1 and is thread - connected to the threaded rod 2 - 2. After the threaded rod 2 - 2 is sleeved with the guide sleeve 2 - 5, it is assembled with the through - hole of the upper connection cover 3 - 3. Then, the small cylinder 3 - 2 is installed on the annular boss at the upper end of the upper connection cover 3 - 3 and fixed by thread connection. After the small piston 2 - 1 and the drive module 1 are assembled in sequence, lubricating oil is applied to the inner wall of the small cylinder 3 - 2, and the top cover 3 - 1 is installed on the top of the small cylinder 3 - 2 and fixed by thread connection; a circular dynamic seal ring Ⅱ2 - 6 is sleeved in the annular groove outside the large piston 2 - 3 and then fixed to the other end of the threaded rod 2 - 2 by thread connection; the large cylinder 3 - 4 is sleeved on the lower annular boss of the upper connection cover 3 - 3, the return spring 3 - 5 is assembled inside the large cylinder 3 - 4, after the inner wall of the large cylinder 3 - 4 is smeared with lubricating oil, the annular boss of the lower connection cover 3 - 6 is inserted into the other end of the large cylinder 3 - 4; finally, the four fixing pull rods 3 - 9 are respectively passed through the circular through - holes at the four corners of the upper connection cover 3 - 3 and the lower connection cover 3 - 6, and each pull rod is fastened and installed with a nut.

[0065] One thin - film one - way valve 3 - 8 is respectively installed at the water inlet and the water outlet of the piston pump of the present invention. When the heating rod is powered on, the drive module 1 pushes the piston module 2 through volume expansion, amplifies the flow rate through the flow - increasing mechanism, discharges the liquid from the thin - film one - way valve 3 - 8 at the water outlet and outputs hydraulic energy externally. When the heating rod is powered off, the drive module 1 cools and shrinks, and the piston module 2 resets under the action of the return spring, sucking in the liquid from the thin - film one - way valve 3 - 8 at the water inlet, and continuously outputs the flow rate in such a cycle.

[0066] The paraffin phase - change driving principle is simple. It outputs work externally through the volume increment generated by the paraffin phase change. Its volume still has a small compression ratio in a high - pressure environment, can generate a large driving force in a small volume. The paraffin driver has high - pressure adaptability compared with traditional driving devices, and also has small volume and high compactness, and is suitable for providing driving force for mechanical structures in deep - sea environments.

[0067] The working principle of the piston pump described in the present invention can be divided into two parts: the piston stroke and the piston return stroke. These two processes alternate and cooperate with two membrane one-way valves 3-8 to achieve the pumping in and pumping out of seawater by the phase change pump;

[0068] Stroke: The power supply supplies power to the drive module 1 to energize and heat the heating rod 1-1. This step causes the copper foam - paraffin phase change unit 1-3 to undergo a phase change when heated, changing from a solid state to a liquid state. During the phase change process, the paraffin expands in volume. Since the density of the liquid is less than that of the solid, this volume expansion pushes the piston module 2 to move (seen as moving downward), and as the piston module 2 moves, the pressure in the pump chamber (the space below the large piston 2-3 and in the groove of the lower connecting cover 3-6) increases, causing the membrane one-way valve 3-8 at the water inlet of the piston pump to close, preventing external media from flowing back. At the same time, the working medium in the pump chamber is forced to be pumped out of the pump chamber through the membrane one-way valve 3-8 at the water outlet of the piston pump; Figure 3 Return stroke: When the power supply is turned off, the heating rod 1-1 stops heating, causing the paraffin in the copper foam - paraffin phase change unit 1-3 to gradually cool and change back from a liquid state to a solid state. The paraffin volume shrinks, and under the pressure of the external seawater, new medium enters the pump chamber through the membrane one-way valve 3-8 at the water inlet of the piston pump to prepare for the next pumping process; at the same time, under the action of the seawater pressure and the restoring force of the return spring 3-5 below the piston module 2, the piston module 2 returns to its original position (seen as moving upward), and the piston finally returns to its original position, completing one cycle.

[0069] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some 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 invention. Figure 3 seen as moving upward), and the piston finally returns to its original position, completing one cycle.

[0070] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some 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 invention.

Claims

1. A deep-sea single-acting piston pump driven by paraffin phase change, characterized in that, It includes a driving module, a piston module and a pump body module; The driving module includes a heating rod, a ceramic end cap, a copper foam - paraffin phase change unit and a silica gel housing; the heating rod includes a heating part and a wire; the copper foam - paraffin phase change unit includes a copper foam layer coated and fixed outside the heating part and a paraffin layer located outside the copper foam layer; the silica gel housing is coated outside the copper foam - paraffin phase change unit; the ceramic end cap is provided with a circular through - hole for the wire to pass through, and the circular through - hole is sealed with silicone rubber glue; the ceramic end cap is tightly adhesively fixed to the top opening of the silica gel housing; The piston module includes a small piston and a large piston threadedly installed at both ends of a threaded rod; The pump body module includes a top end cap, a small cylinder, an upper connecting cover, a large cylinder and a lower connecting cover fixedly connected in sequence from top to bottom; through - holes penetrating the upper and lower end faces are respectively provided in the centers of the small cylinder, the upper connecting cover and the large cylinder; the driving module and the small piston are located inside the through - hole in the center of the small cylinder, the driving module is located above the small piston, and the wire of the heating rod extends out through the wire outlet in the center of the top end cap; the large piston is located inside the through - hole in the center of the large cylinder, and a return spring is installed between the large piston and the lower connecting cover; the threaded rod is located inside the through - hole in the center of the upper connecting cover; a pressure balance hole communicating with the through - hole in the center of the upper connecting cover is provided on the side of the upper connecting cover; a groove communicating with the through - hole in the center of the large cylinder is provided in the center of the lower connecting cover, and a threaded hole communicating with the groove is respectively provided on both sides of the lower connecting cover, and a thin - film one - way valve is respectively installed through threaded connection in each threaded hole, and the two threaded holes respectively serve as the water inlet and the water outlet of the piston pump.

2. The deep-sea single-acting piston pump driven by paraffin phase change according to claim 1, wherein Two circumferential annular grooves are respectively provided on the outer side surfaces of the small piston and the large piston, and a circular dynamic seal ring I is installed in each annular groove of the small piston, and a circular dynamic seal ring II is installed in each annular groove of the large piston.

3. The deep-sea single-acting piston pump driven by paraffin phase change according to claim 1, wherein Threaded holes for installing the threaded rod are respectively provided at the bottom of the small piston and the top of the large piston.

4. The deep-sea single-acting piston pump driven by paraffin phase change according to claim 1, characterized in that, A guide sleeve is sleeved outside the threaded rod.

5. The deep-sea single-acting piston pump driven by paraffin phase change according to claim 1, characterized in that Annular protrusions are respectively provided at the upper and lower ends of the upper connecting cover and the upper end of the lower connecting cover; Internal threads are provided at the lower part of the top end cap, and internal threads are provided on the annular protrusion at the upper end of the upper connecting cover. The small cylinder is threadedly connected to the top end cap and the annular protrusion at the upper end of the upper connecting cover respectively through external threads provided at both ends; External threads are respectively provided on the annular protrusion at the lower end of the upper connecting cover and the annular protrusion at the upper end of the lower connecting cover. The large cylinder is threadedly connected to the annular protrusion at the lower end of the upper connecting cover and the annular protrusion at the upper end of the lower connecting cover respectively through internal threads provided at both ends.

6. The deep-sea single-acting piston pump driven by paraffin phase change according to claim 1, wherein The pump body module further includes a fixed pull rod for fixedly connecting the upper connecting cover and the lower connecting cover.

7. The deep-sea single-acting piston pump driven by paraffin phase change according to claim 6, wherein The upper connecting cover and the lower connecting cover are connected by four of the fixed tie rods. Circular through holes for installing the fixed tie rods are provided at the four corners of the upper connecting cover and the lower connecting cover, and after the fixed tie rods pass through the circular through holes, nuts are used for fastening.

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