CN220285922U

CN220285922U - High-rotation-speed ionic liquid compressor

Info

Publication number: CN220285922U
Application number: CN202321121872.4U
Authority: CN
Inventors: 李云; 刘泽坤; 康祥
Original assignee: Shaanxi Haizhuo Kangpu New Energy Technology Co ltd; Xian Jiaotong University
Current assignee: Shaanxi Haizhuo Kangpu New Energy Technology Co ltd; Xian Jiaotong University
Priority date: 2023-05-10
Filing date: 2023-05-10
Publication date: 2024-01-02
Anticipated expiration: 2033-05-10

Abstract

The utility model discloses a high-rotation-speed ionic liquid compressor, which uses an H-shaped piston as a solid piston to push a liquid piston, and in the high-speed reciprocating motion process, the H-shaped piston can concentrate most ionic liquid in an annular groove of the H-shaped piston, so that the escape of the ionic liquid in the exhaust process is effectively reduced, meanwhile, enough ionic liquid can be stored in key sealing parts such as a contact surface between the piston and a cylinder wall, and the like, so that the liquid sealing and lubricating functions of the ionic liquid on the cylinder are ensured to be normally realized, and the ionic liquid compressor can be operated efficiently, safely and stably.

Description

High-rotation-speed ionic liquid compressor

Technical Field

The application belongs to the technical field of compressors, and particularly relates to a high-rotation-speed ionic liquid compressor.

Background

Hydrogen energy is now considered as a zero-emission, pollution-free, sustainable green energy source as an important way to solve the energy problem in the new century. Among the many fields of application of hydrogen, hydrogen fuel cell automobiles are considered as the primary break-through and important outlets for the hydrogen energy industry. The popularization and promotion of the hydrogen fuel cell automobile are limited by the range of the hydrogen fuel cell automobile, and the range of the hydrogen fuel cell automobile depends on the filling pressure of the vehicle-mounted gas cylinder. Therefore, high-pressure, large-displacement, low-energy-consumption hydrogen pressurizing equipment is of great importance for the development of the hydrogen fuel cell automobile industry.

The types of hydrogen compressors commonly used in hydrogen stations today are diaphragm compressors, reciprocating piston compressors, and liquid-driven piston compressors. The diaphragm compressor compresses gas by driving the flexible diaphragm to deform through hydraulic oil, has the advantages of good tightness, high single-machine pressure ratio, high hydrogen cleanliness and the like, but the service life of the diaphragm cannot be ensured under the working condition that a hydrogenation station is repeatedly started and stopped; the reciprocating piston type compressor has large discharge capacity and strong working condition adaptability, but the problems of sealing and oil-free lubrication under high pressure are difficult to solve, so that the operation and maintenance cost is higher; the liquid drive piston compressor has the advantages of simple structure, few moving parts and easy maintenance, but the liquid drive stroke frequency is limited, and the large displacement is difficult to realize.

An ionic liquid compressor is a hydrogen compressor that uses a solid piston to push a liquid piston to perform a gas compressor. The liquid piston composed of ionic liquid has the functions of gas compression, enhanced heat transfer, liquid sealing and piston lubrication in the cylinder. The ionic liquid compressor integrates the advantages of the three compressors, can realize the hydrogen compression process with high rotation speed, large discharge capacity and low energy consumption, and meets the working environment that the hydrogenation station is frequently started and stopped and the air inlet and outlet pressure is continuously changed.

However, high-speed reciprocation can make it difficult for the liquid piston to remain morphologically stable during compressor operation. On the one hand, part of the liquid is discharged together with the hydrogen in the exhaust stage, so that the clearance volume of the cylinder is increased, and the volumetric efficiency of the compressor is reduced; on the other hand, the turbulence of the liquid form makes part of critical sealing positions of the solid piston not enough ionic liquid when the solid piston is at the point of descending, and a liquid film cannot be formed, so that the liquid sealing and lubricating functions are disabled. This will seriously affect the working efficiency and safe and stable operation of the ionic liquid compressor.

Disclosure of Invention

The utility model aims to provide a high-rotation-speed ionic liquid compressor so as to solve the problems that the volumetric efficiency of the existing compressor is reduced, and liquid sealing and lubricating functions are easy to lose effectiveness.

The high-rotation-speed ionic liquid compressor comprises a cylinder and an H-shaped piston arranged in the cylinder, wherein a compression cavity and a driving cavity are arranged in the cylinder, a boss is arranged between the compression cavity and the driving cavity, the H-shaped piston is arranged in the compression cavity of the cylinder, one end of the H-shaped piston is connected with a driving device, the driving device is arranged in the driving cavity, the outer diameter of the upper end of the H-shaped piston is smaller than the outer diameter of the lower end of the H-shaped piston, and the outer wall of the lower end of the H-shaped piston is attached to the inner wall of the compression cavity of the cylinder; the compression cavity of the air cylinder is internally provided with an H-shaped piston filled with ionic liquid, and is communicated with an air source and a high-pressure storage tank through an air inlet pipeline and an air outlet pipeline respectively.

Preferably, an H-shaped piston sealing element is arranged between the outer wall of the lower end of the H-shaped piston and the inner wall of the compression cavity of the cylinder.

Preferably, an air inlet pipeline connected between the air source and the compression cavity of the cylinder is sequentially provided with a first electromagnetic switch valve, a first one-way valve and an air inlet valve, and the air inlet valve is arranged at the air inlet of the cylinder.

Preferably, an exhaust valve, a second one-way valve and a heat exchanger are sequentially arranged on the exhaust pipeline between the compression cavity of the connecting cylinder and the high-pressure storage tank.

Preferably, a gas-liquid separator is arranged between the high-pressure storage tank and the heat exchanger, a filter is arranged between the gas-liquid separator and the high-pressure storage tank, a liquid level sensor is arranged at the bottom of the gas-liquid separator, and the bottom of the gas-liquid separator is connected to a compression cavity of the cylinder through a first liquid supplementing pipeline.

Preferably, the driving device comprises a crank connecting rod mechanism and a connector, one end of the crank connecting rod mechanism is connected with one end of a piston rod through the connector, the other end of the piston rod is connected with the lower end of the H-shaped piston, and the piston rod is positioned in the driving cavity.

Preferably, a connector sealing element is arranged between the connector and the inner wall of the cylinder.

Preferably, the crank-link mechanism is disposed in a crankcase, which is secured to the bottom of the cylinder.

Preferably, the liquid level of the ionic liquid is higher than the upper end surface of the H-shaped piston, the ionic liquid is used as the liquid piston to be arranged in the cylinder, the ionic liquid fills the annular groove of the H-shaped piston, and the liquid level of the liquid piston is slightly higher than the upper surface of the H-shaped piston.

Preferably, the air source is a low pressure air source.

Compared with the prior art, the utility model has the following beneficial technical effects:

the utility model provides a high-rotation-speed ionic liquid compressor, which uses an H-shaped piston as a solid piston to push a liquid piston, and in the high-speed reciprocating motion process, the H-shaped piston can concentrate most ionic liquid in an annular groove of the H-shaped piston, so that the escape of the ionic liquid in the exhaust process is effectively reduced, and meanwhile, enough ionic liquid can be stored in key sealing parts such as a contact surface between the piston and a cylinder wall, so that the liquid sealing and lubricating functions of the ionic liquid on the cylinder are normally realized, and the ionic liquid compressor can operate efficiently, safely and stably.

Preferably, the ionic liquid supplementing system is arranged in the ionic liquid compressor, so that ionic liquid can be supplemented to the air cylinder in real time in the operation process of the compressor, the loss of the ionic liquid in the reciprocating motion of the compressor is compensated, the generation of extra clearance volume of the air cylinder is prevented, and the working efficiency of the ionic liquid compressor is improved.

Drawings

Fig. 1 is a schematic view of a compressor according to an embodiment of the present utility model.

In the figure, 101-air source, 102-first electromagnetic switch valve, 103-first one-way valve, 104-air inlet valve, 105-air outlet valve, 106-air cylinder, 107-crank connecting rod mechanism, 108-crankcase, 109-connector, 110-connector sealing piece, 111-piston rod, 112-piston sealing piece, 113-ionic liquid, 114-H-type piston, 115-second one-way valve, 116-heat exchanger, 201-gas-liquid separator, 202-liquid level sensor, 203-filter, 204-high-pressure storage tank, 205-safety valve, 206-ionic liquid tank, 207-second electromagnetic switch valve, L1-first gas pipeline, L2-second gas pipeline, L3-third gas pipeline, L4-first fluid supplementing pipeline and L5-second fluid supplementing pipeline.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Examples

As shown in fig. 1, the high-rotation-speed ionic liquid compressor comprises a gas compression assembly Z1 and an ionic liquid supplementing assembly Z2, wherein the gas compression assembly Z1 and the ionic liquid supplementing assembly Z2 are connected through a second gas pipeline L2.

The gas compression assembly Z1 comprises an air inlet pipeline, an exhaust pipeline and a compressor main body;

the air inlet pipeline comprises an air source 101, a first electromagnetic switch valve 102, a first one-way valve 103, an air inlet valve 104 and a first air pipeline L1, wherein the air source 101 is connected with one end of the first electromagnetic switch valve 102 through the first air pipeline L1, the other end of the first electromagnetic switch valve 102 is connected with one end of the first one-way valve 103 through the first air pipeline L1, the other end of the first one-way valve 103 is connected with one end of the air inlet valve 104 through the first air pipeline L1, and the air inlet valve is arranged on an air inlet of an air cylinder 106 and is directly connected with the air cylinder 106.

The exhaust pipeline comprises an exhaust valve 105, a second one-way valve 115, a heat exchanger 116 and a second gas pipeline L2, one end of the exhaust valve 105 is connected with one end of the second one-way valve 115 through the second gas pipeline L2, the other end of the second one-way valve 115 is connected with one end of the heat exchanger 116 through the second gas pipeline L2, and the exhaust valve 105 is arranged on an exhaust port of the air cylinder 106 and is directly connected with the air cylinder 106.

In one embodiment of the present application, the air source 101 is a low-pressure air source, which is simple in structure, safe and reliable.

The compressor body comprises a cylinder 106, a crank-link mechanism 107, a crank case 108, a connector 109, a connector seal 110, a piston rod 111, an H-shaped piston seal 112, ionic liquid 113 and an H-shaped piston 114, wherein the H-shaped piston 114 is slidably arranged in the cylinder 106 and can be driven by a multistage radial hydraulic pump or a crank-link mechanism.

In one embodiment of the present application, the crank-link mechanism 107 is used to drive the H-shaped piston to reciprocate, the crank-link mechanism 107 is connected with the connector 110, the connector 110 is slidably disposed in the crankcase, the H-shaped piston 114 is connected with the connector 110 through the piston rod 111, and the length of the piston rod 111 is greater than three times the stroke of the H-shaped piston 114.

A piston seal 112 is disposed between the outer wall of the H-shaped piston 114 and the inner wall of the cylinder 106, and in this embodiment, the piston seal 112 is formed by three piston rings. A connector seal is disposed between the outer wall of the connector 110 and the inner wall of the cylinder 106.

In one embodiment of the present application, the connector seal is a connector seal ring. The lower end surface of the H-shaped piston 114, the inner wall of the cylinder 106 and the piston rod 111 form an isolation cavity. The ionic liquid 113 is arranged in the cylinder 106 as a liquid piston, the ionic liquid 113 fills the annular groove of the H-shaped piston 114, and the liquid level of the liquid piston is slightly higher than the upper surface of the H-shaped piston 114.

The ionic liquid replenishing component Z2 comprises a gas-liquid separator 201, a liquid level sensor 202, a filter 203, a high-pressure storage tank 204, a safety valve 205, an ionic liquid tank 206, a second electromagnetic switch valve 207, a third gas pipeline L3, a first liquid replenishing pipeline L4 and a second liquid replenishing pipeline L5, the other end of the heat exchanger 116 is connected with the gas-liquid separator 201 through the second gas pipeline L2, the middle part of the gas-liquid separator 201 is connected with the second gas pipeline L2, the upper end of the gas-liquid separator 201 is connected with one end of the filter 203 through the third gas pipeline L3, the other end of the filter 203 is connected with the high-pressure storage tank 204 through the third gas pipeline L3, one end of the second electromagnetic switch valve is connected with the lower end of the gas-liquid separator 201 through the first liquid replenishing pipeline L4, the other end of the second electromagnetic switch valve 207 is connected with the first gas pipeline L1 through the first liquid replenishing pipeline L4, and one end of the safety valve 205 is connected with the ionic liquid tank 206 through the second liquid replenishing pipeline L5. The liquid level sensor 202 is installed at the bottom of the gas-liquid separator 201.

Three seal ring grooves are formed in the outer cylindrical surface of the H-shaped piston, three piston rings are arranged in the grooves, and a liquid seal system is formed together with the ionic liquid, so that leakage of hydrogen on a dynamic seal surface between the piston and the cylinder wall is effectively prevented; the inner wall of the air cylinder, the piston rod and the lower end face of the H-shaped piston form an isolation cavity, so that the isolation between the compression end and the driving end is realized, and a small amount of ionic liquid and hydrogen leaked in the isolation cavity can be timely led out; the length of the piston rod is required to be three times of the piston stroke, so that the pollution of lubricating oil or hydraulic oil at the driving end to the ionic liquid and hydrogen in the compression end is avoided, and the purity of the compressed working medium is ensured.

The working principle of the utility model is as follows:

before compression starts, the opening time and the opening interval of the second electromagnetic switch valve 207 are preset, and the liquid level height threshold of the liquid level sensor is set, and at this time, the first electromagnetic switch valve 102 and the second electromagnetic switch valve 207 are both in a closed state.

The gas pressurization process comprises the following steps: the crank-link mechanism 107 is driven by the motor to start rotating, and then drives the connector 110, the piston rod 111 and the H-shaped piston 114 to reciprocate. The first electromagnetic switch valve 102 is opened, and low-pressure hydrogen starts from the gas source 101 and sequentially passes through the first electromagnetic switch valve 102, the first one-way valve 103 and the gas inlet valve 104 along the first gas pipeline L1 to enter the cylinder 106 for compression; the pressurized gas sequentially enters the heat exchanger 116 through the exhaust valve 105 and the second one-way valve 115 along the second gas pipeline L2, enters the gas-liquid separator 201 after heat exchange of the heat exchanger 116, enters the high-pressure storage tank 204 after gas-liquid separation in the gas-liquid separator, and enters the high-pressure storage tank 204 after the high-pressure gas is filtered through the filter 203 along the third gas pipeline L3, so that the gas pressurizing process is finished. The intake valve 104 and the exhaust valve 105 are automatically opened and closed by the pressure difference.

In one embodiment of the present application, the H-piston 114 is driven by the crank mechanism 107, which is simpler in construction and easier to achieve at high speeds than a hydraulic drive. The ionic liquid 113 forms a liquid seal with the piston seal 113, effectively preventing gas leakage in the axial direction towards the crankcase during compressor operation. An isolation cavity is formed among the lower end face of the H-shaped piston 114, the inner wall face of the cylinder 106 and the piston rod 111, and the piston rod 111 with the stroke length being three times of that of the piston is matched, so that the isolation between the compression end and the driving end is realized, and the working medium is prevented from being polluted by hydraulic oil or lubricating oil from the driving end.

In the reciprocating motion process of the piston, most of the liquid is concentrated in the annular groove of the H-shaped piston 114 by the ionic liquid 113 under the action of the H-shaped piston 114, so that the surface of the piston can still form a complete liquid film when the piston is at the bottom dead center.

Ion liquid supplementing process: during the gas pressurization process, a part of the ionic liquid 113 in the gas cylinder 106 enters the gas-liquid separator 201 along the path of the second gas pipe L2 along with the gas in the exhaust stage, and remains in the gas-liquid separator 201. When the preset fluid replacement time is reached, the second electromagnetic switch valve 207 is opened, the ionic liquid in the gas-liquid separator 201 enters the first gas pipeline L1 along the first fluid replacement pipeline L4 through the second electromagnetic switch valve 207, and continues to enter the cylinder 106 through the air inlet valve 104, and when the fluid replacement amount meets the requirement, the second electromagnetic switch valve 207 is closed, and the ionic liquid replacement process is ended.

The utility model relates to a high-rotation-speed ionic liquid compressor using an H-shaped piston, which consists of a gas compression assembly and an ionic liquid supplementing assembly, and comprises the H-shaped piston, an electromagnetic switch valve, a crank connecting rod mechanism, a gas-liquid separator, a piston sealing member and the like. The compressor adopts the H-shaped structure piston, so that the escape of ionic liquid in the exhaust process can be effectively reduced, meanwhile, enough ionic liquid can be stored in key sealing parts such as the contact surface between the piston and the cylinder wall, the normal realization of the liquid sealing and lubricating functions of the ionic liquid to the cylinder is ensured, the ionic liquid supplementing component can supplement the ionic liquid to the cylinder in real time, the generation of extra clearance volume is avoided, the working efficiency of the compressor is improved, and the efficient, high-pressure, large-discharge, safe and stable hydrogen supercharging process can be realized.

Claims

1. The high-rotation-speed ionic liquid compressor is characterized by comprising an air cylinder (106) and an H-shaped piston (114) arranged in the air cylinder (106), wherein a compression cavity and a driving cavity are arranged in the air cylinder (106), a boss is arranged between the compression cavity and the driving cavity, the H-shaped piston (114) is arranged in the compression cavity of the air cylinder (106), one end of the H-shaped piston (114) is connected with a driving device, the driving device is arranged in the driving cavity, the outer diameter of the upper end of the H-shaped piston (114) is smaller than the outer diameter of the lower end of the H-shaped piston, and the outer wall of the lower end of the H-shaped piston (114) is attached to the inner wall of the compression cavity of the air cylinder (106); the compression cavity of the air cylinder (106) is internally provided with an H-shaped piston (114) filled with ionic liquid (113), and the compression cavity of the air cylinder (106) is respectively communicated with an air source (101) and a high-pressure storage tank (204) through an air inlet pipeline and an air outlet pipeline.

2. A high rotational speed ionic liquid compressor according to claim 1, wherein an H-shaped piston seal (112) is provided between the outer wall of the lower end of the H-shaped piston (114) and the inner wall of the compression chamber of the cylinder (106).

3. The high-rotation-speed ionic liquid compressor according to claim 1, wherein a first electromagnetic switch valve (102), a first one-way valve (103) and an air inlet valve (104) are sequentially arranged on an air inlet pipeline between compression cavities connected with an air source (101) and an air cylinder (106), and the air inlet valve (104) is arranged at an air inlet of the air cylinder (106).

4. The high-rotation-speed ionic liquid compressor according to claim 1, wherein an exhaust valve (105), a second one-way valve (115) and a heat exchanger (116) are sequentially arranged on an exhaust pipeline between a compression cavity of the connecting cylinder (106) and the high-pressure storage tank (204).

5. The high-rotation-speed ionic liquid compressor according to claim 4, wherein a gas-liquid separator (201) is arranged between the high-pressure storage tank (204) and the heat exchanger (116), a filter (203) is arranged between the gas-liquid separator (201) and the high-pressure storage tank (204), a liquid level sensor (202) is arranged at the bottom of the gas-liquid separator (201), and the bottom of the gas-liquid separator (201) is connected to a compression cavity of the cylinder (106) through a first liquid supplementing pipeline L (4).

6. The high-rotation-speed ionic liquid compressor according to claim 1, wherein the driving device comprises a crank-link mechanism (107) and a connector (109), one end of the crank-link mechanism (107) is connected with one end of a piston rod (111) through the connector (109), the other end of the piston rod (111) is connected with the lower end of an H-shaped piston (114), and the piston rod (111) is located in the driving cavity.

7. A high rotational speed ionic liquid compressor according to claim 6, wherein a connector seal (110) is provided between the connector (109) and the inner wall of the cylinder (106).

8. The high-speed ionic liquid compressor according to claim 6, wherein the crank-link mechanism (107) is disposed in a crankcase (108), and the crankcase (108) is fixed to the bottom of the cylinder (106).

9. A high rotational speed ionic liquid compressor according to claim 1, wherein the ionic liquid (113) has a liquid level higher than the upper end surface of the H-shaped piston (114).

10. A high rotational speed ionic liquid compressor according to claim 6, wherein the piston rod (111) is longer than three times the stroke of the H-shaped piston (114).