Multistage liquid inlet mechanism of immersed liquid hydrogen pump

Abstract

The utility model discloses a multi-stage liquid inlet mechanism of an immersed type liquid hydrogen pump. The multi-stage liquid inlet mechanism comprises a pump body and a piston installed in the pump body in a sliding mode. The hydraulic pump is characterized by further comprising a liquid inlet mechanism arranged on the pump body and the piston, and the liquid inlet mechanism comprises a multi-stage liquid inlet cavity formed in the pump body, a partition plate arranged on the piston and located in the multi-stage liquid inlet cavity and a floating plate movably connected to the piston. Through the arrangement of the multi-stage liquid inlet mechanism, liquid hydrogen is subjected to multi-stage compression before entering the liquid hydrogen pump and being compressed by the piston, so that the pressure of the liquid hydrogen is improved, the supercooling temperature point of the liquid hydrogen is improved, the liquid hydrogen is far away from a gas phase saturation point, the cavitation phenomenon is reduced, the filling rate of liquid entering a piston cavity is improved, and the liquid inlet efficiency is improved; therefore, the compression efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a liquid hydrogen pump, in particular to a multi-stage liquid inlet mechanism of a submersible liquid hydrogen pump. Background Art

[0002] Existing liquid hydrogen pumps basically use one-stage compression when compressing liquid hydrogen into a storage tank. The liquid hydrogen in the liquid hydrogen pool directly enters the piston cavity and is directly pressed out into the storage tank through the piston. However, the liquid hydrogen directly entering the piston cavity is a mixture of gas and liquid without pre-compression, and the cavitation phenomenon is serious. As a result, the efficiency of liquid inlet and the filling rate of the piston cavity can only reach about 70-80% in this way, the filling rate is low, the liquid inlet efficiency is slow, and the compression efficiency is low. To this end, a multi-stage liquid inlet mechanism of a submersible liquid hydrogen pump is proposed. Utility Model Content

[0003] The purpose of the utility model is to solve the above problems and to provide a multi-stage liquid inlet mechanism for a submersible liquid hydrogen pump.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: a multi-stage liquid inlet mechanism of a submersible liquid hydrogen pump, comprising a pump body and a piston slidably installed in the pump body; it is characterized in that it also includes a liquid inlet mechanism arranged on the pump body and the piston, and the liquid inlet mechanism includes a multi-stage liquid inlet cavity arranged on the pump body, a partition plate arranged on the piston and located in the multi-stage liquid inlet cavity, and a floating plate movably connected to the piston.

[0005] Further preferably, the partition plate divides the multi-stage liquid inlet chamber into a lower chamber and an upper chamber, and the floating plate is located in the upper chamber.

[0006] Further preferably, the partition plate is provided with a liquid inlet channel connecting the lower cavity and the upper cavity, the cavity is provided with a liquid inlet, and the upper cavity is provided with a liquid outlet.

[0007] Further preferably, the piston is also provided with a limiter which limits the movement stroke of the floating plate.

[0008] The beneficial effects of the utility model are as follows: through the arrangement of the multi-stage liquid inlet mechanism, liquid hydrogen is first compressed in multiple stages before entering the liquid hydrogen pump and being compressed by the piston, thereby increasing the pressure of the liquid hydrogen, thereby increasing the supercooling temperature point of the liquid hydrogen and keeping it away from the gas phase saturation point, thereby reducing cavitation, increasing the filling rate of the liquid entering the piston cavity, increasing the liquid inlet efficiency, and thus improving the compression efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Attached Figure 1 It is a structural schematic diagram of the utility model;

[0010] Attached Figure 2 This utility model is attached Figure 1 A local enlarged view of point A in FIG.

[0011] Attached Figure 3 It is a partial structural schematic diagram of the utility model.

[0012] Legend: 1. Pump body; 2. Piston; 3. Liquid inlet mechanism; 4. Multi-stage liquid inlet chamber; 41. Lower chamber; 42. Upper chamber; 5. Partition plate; 6. Floating plate; 7. Liquid inlet channel; 8. Liquid inlet port; 9. Limiting member; 10. Liquid outlet port. DETAILED DESCRIPTION

[0013] Next, we further explain the multi-stage liquid inlet mechanism of the submersible liquid hydrogen pump described in the utility model in conjunction with the accompanying drawings.

[0014] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the utility model are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0015] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense; for example, "fixation" 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] See also Figure 1-3 As shown in the figure, a multi-stage liquid inlet mechanism of a submersible liquid hydrogen pump comprises a pump body 1 and a piston 2 slidably mounted in the pump body 1; it is characterized in that it also comprises a liquid inlet mechanism 3 arranged on the pump body 1 and the piston 2, the liquid inlet mechanism 3 comprises a multi-stage liquid inlet cavity 4 arranged on the pump body 1, a partition plate 5 arranged on the piston 2 and located in the multi-stage liquid inlet cavity 4, and a floating plate 6 movably connected to the piston 2;

[0017] By setting up a multi-stage liquid inlet mechanism, liquid hydrogen is first compressed in multiple stages before entering the liquid hydrogen pump and being compressed to the storage tank through the piston 2, thereby increasing the pressure of the liquid hydrogen, thereby increasing the supercooling temperature point of the liquid hydrogen and keeping it away from the gas phase saturation point, thereby reducing cavitation, increasing the filling rate of the liquid entering the piston 2 cavity, improving the liquid inlet efficiency, and thus improving the compression efficiency.

[0018] In one embodiment, the partition plate 5 divides the multi-stage liquid inlet chamber 4 into a lower chamber 41 and an upper chamber 42, and the floating plate 6 is located in the upper chamber 42; through the setting of the floating plate 6, the floating plate 6 is automatically pushed to move according to the pressure changes in the upper chamber 42 and the lower chamber 41 to open or close the channel between the lower chamber 41 and the upper chamber 42.

[0019] In one embodiment, the partition plate 5 is provided with a liquid inlet channel 7 connecting the lower chamber 41 and the upper chamber 42, the lower chamber 41 is provided with a liquid inlet port 8, and the upper chamber 42 is provided with a liquid outlet port 10. The liquid outlet port 10 can be set on the piston 2 or on the pump body 1, and the liquid outlet port 10 is connected with the piston chamber of the liquid hydrogen pump; in this embodiment, the pump body 1 is placed in the pump pool, and the liquid hydrogen in the pump pool enters the lower chamber 41 through the liquid inlet port 8. When the channel between the lower chamber 41 and the upper chamber 42 is opened, the liquid hydrogen in the lower chamber 41 enters the upper chamber 42 through the liquid inlet channel 7. When the piston 2 compresses the liquid hydrogen in the upper chamber 42 during the action, the liquid hydrogen in the upper chamber 42 enters the piston chamber of the piston 2 through the liquid outlet port 10 and is compressed into the storage tank by the piston 2.

[0020] In one embodiment, the piston 2 is further provided with a limiter 9 for limiting the movement stroke of the floating plate 6. The limiter 9, in combination with the partition plate 5, limits the up and down movement stroke of the floating plate 6.

[0021] When the utility model is in use: the piston 2 reciprocates up and down to drive the partition plate 5 to move up and down in the multi-stage liquid inlet cavity 4;

[0022] When the piston 2 drives the partition plate 5 to move upward, the volume of the lower chamber 41 increases, the pressure in the lower chamber 41 decreases, and the liquid hydrogen in the pump pool enters the lower chamber 41 through the liquid inlet 8. When the piston 2 drives the partition plate 5 downward, the partition plate 5 performs primary compression on the liquid hydrogen in the lower chamber 41. After being compressed, the liquid hydrogen in the lower chamber 41 pushes the floating plate 6 upward to open the liquid inlet channel 7 between the lower chamber 41 and the upper chamber 42. The liquid hydrogen enters the upper chamber 42 through the liquid inlet channel 7. When the piston 2 drives the partition plate 5 upward, the liquid hydrogen in the upper chamber 42 is compressed for the second time. After being compressed, the liquid hydrogen in the upper chamber 42 pushes the floating plate 6 downward until it fits with the partition plate 5 and then closes the liquid inlet channel 7. At the same time, the liquid hydrogen in the upper chamber 42 is discharged to the piston 2 chamber of the liquid hydrogen pump through the liquid outlet 10 after being compressed for the second time. The liquid hydrogen in the piston 2 chamber is compressed into the storage tank as the piston 2 moves.

[0023] The protection scope of the present utility model is not limited to the above embodiments and their variations. Conventional modifications and replacements made by those skilled in the art based on the contents of this embodiment all fall within the protection scope of the present utility model.

Claims

1. A multi-stage liquid inlet mechanism of a submersible liquid hydrogen pump, comprising a pump body (1) and a piston (2) slidably mounted in the pump body (1); wherein: The invention also comprises a liquid inlet mechanism (3) arranged on the pump body (1) and the piston (2), wherein the liquid inlet mechanism (3) comprises a multi-stage liquid inlet chamber (4) arranged on the pump body (1), a partition plate (5) arranged on the piston (2) and located in the multi-stage liquid inlet chamber (4), and a floating plate (6) movably connected to the piston (2).

2. The multi-stage liquid inlet mechanism of a submersible liquid hydrogen pump according to claim 1, characterized in that: The partition plate (5) divides the multi-stage liquid inlet chamber (4) into a lower chamber (41) and an upper chamber (42), and the floating plate (6) is located in the upper chamber (42).

3. The multi-stage liquid inlet mechanism of a submersible liquid hydrogen pump according to claim 2, characterized in that: The partition plate (5) is provided with a liquid inlet channel (7) connecting the lower chamber (41) and the upper chamber (42); the lower chamber (41) is provided with a liquid inlet (8); and the upper chamber (42) is provided with a liquid outlet (10).

4. The multi-stage liquid inlet mechanism of a submersible liquid hydrogen pump according to claim 1, characterized in that: The piston (2) is also provided with a limiting member (9) which limits the movement stroke of the floating plate (6).

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