CN115288996B - A performance test device for simulating ionic liquid hydrogen compressor - Google Patents

Abstract

The invention provides a performance test device for simulating an ionic liquid hydrogen compressor, comprising a cylinder and an air compressor. One end of the cylinder is closed by a cylinder head made of a transparent material. A long piston is arranged inside the cylinder. The long piston is driven to reciprocate along the inner wall of the cylinder to compress the medium in the space between the end surface of the long piston, the inner wall of the cylinder, and the inner wall of the cylinder head. The air compressor provides pressurized gas in the space between the end surface of the long piston, the inner wall of the cylinder, and the inner wall of the cylinder head; It can directly observe the change of the state of the ionic liquid as the pressure changes in the process of compressing the gas, and can be used to study the lubrication and sealing performance of the ionic liquid on the hydrogen compressor under different pressures, as well as to study the pressure resistance and wear resistance of seals of different types and materials.

Description

A performance test device for simulating ionic liquid hydrogen compressor

technical field

The invention relates to the technical field of hydrogen compressors, in particular to a performance test device for simulating ionic liquid hydrogen compressors.

Background technique

Hydrogen is rich in sources. As a clean energy, it has the characteristics of cleanness, high efficiency, zero pollution, and zero emissions, and has received extensive attention from all over the world. With the widespread promotion and application of hydrogen energy, it will help reduce my country's dependence on foreign energy and contribute to the green and sustainable development of the country and the world in the future.

The promotion of hydrogen energy must first accelerate the construction of hydrogen refueling stations. Among them, hydrogen compressors are one of the three core equipments of hydrogen refueling stations. The cost is the highest, and it is also the main factor for the failure of hydrogen refueling stations. Therefore, low-cost, high-stability hydrogen compressors are the main research objects for the development of hydrogen refueling stations. Among them, the ionic liquid hydrogen compressor has the advantages of long maintenance period and high comprehensive efficiency, and its core advantage lies in the good cooling and lubrication performance of ionic liquid.

However, the current research on the motion characteristics of ionic liquid in the ionic liquid hydrogen compressor is still blank, which not only affects the design of key components of the compressor such as pistons and valves, but also affects the performance optimization and product development and upgrading of the ionic liquid hydrogen compressor. Therefore, it is very necessary to build a reliable ionic liquid performance test system for the ionic liquid hydrogen compressor.

Contents of the invention

In order to achieve the above object, the present invention provides a performance test device for simulating an ionic liquid hydrogen compressor, which can visually observe the change of the state of the ionic liquid as the pressure changes during the gas compression process, and can be used to study the lubrication and sealing performance of the ionic liquid to the hydrogen compressor under different pressures, and to study the pressure resistance and wear resistance of seals of different models and materials.

The technical scheme adopted in the present invention is as follows: a performance test device for simulating an ionic liquid hydrogen compressor, characterized in that it includes a cylinder and an air compressor, and one end of the cylinder is closed by a cylinder cover made of a transparent material. Preferably, the cylinder cover is made of plexiglass, which is fixedly installed on the end flange of the cylinder with bolts; a long piston is arranged inside the cylinder, and the long piston is driven to reciprocate along the inner wall of the cylinder to compress the medium in the space between the end surface of the long piston, the inner wall of the cylinder and the inner wall of the cylinder cover. ;

The cylinder head is provided with a through hole, and the air compressor is connected to the through hole of the cylinder head through a gas pipeline. The air compressor provides pressurized gas for the space between the long piston end surface, the cylinder inner wall surface, and the cylinder head inner wall surface; a gas storage tank is connected in series on the gas pipeline between the air compressor and the cylinder head, and a safety valve and a first pressure gauge are arranged on the gas storage tank. During the motion compression process, the state change of the gas inside the cylinder is monitored in real time, and the gas pressure value provided by the air compressor to the cylinder during the test is obtained through the first pressure gauge.

The middle section of the outer peripheral surface of the long piston is recessed toward the radially inner side, and the recess forms an ionic liquid chamber, and the ionic liquid chamber is filled with pressurized ionic liquid, and a first sealing ring and a second sealing ring are also arranged between the outer peripheral surface of the long piston and the inner wall of the cylinder, the first sealing ring is located above the ionic liquid chamber, and the second sealing ring is located below the ionic liquid chamber. The device also includes an accumulator, a plunger pump, and an ionic liquid storage tank. The ionic liquid chamber is connected to the accumulator, the plunger pump, and the ionic liquid storage tank in sequence through a liquid supply pipeline. The plunger pump is used to pressurize and transport the replenishing ionic liquid in the ionic liquid storage tank to the accumulator and the inside of the ionic liquid chamber. A second pressure gauge is installed on the accumulator, and the second pressure gauge is used to obtain the pressure value of the ionic liquid in the ionic liquid chamber in real time.

Further, the through hole of the cylinder head is provided with an air valve for controlling the opening and closing of the gas pipeline, and the air valve controls the opening and closing of the air passage between the air compressor and the inner space of the cylinder.

Both the first sealing ring and the second sealing ring are installed in the annular groove provided on the outer peripheral surface of the long piston. One to three annular grooves are arranged at the position where the first sealing ring is installed on the outer peripheral surface of the long piston, and one to three annular grooves are also arranged at the position where the second sealing ring is installed on the outer peripheral surface of the long piston. According to the test requirements, different numbers of sealing rings are installed in the annular groove to explore the influence of the number and shape of the sealing rings on the sealing performance and service life.

The inlet of the gas storage tank is provided with a first regulating valve for controlling the on-off of the gas pipeline, and the outlet of the gas storage tank is provided with a second regulating valve for controlling the on-off of the gas pipeline. The first regulating valve and the second regulating valve are opened and closed according to the requirements of the test and the maintenance of the gas pressure in the gas storage tank. And the maintenance of the ionic liquid pressure in the accumulator requires opening and closing operations.

The cylinder is installed on the crankcase, and a second stepping motor is installed in the crankcase, and the second stepping motor drives the crank of the crank-connecting rod structure to rotate, and the connecting rod of the crank-connecting rod structure is connected to the long piston through a crosshead, so that the second stepping motor drives the long piston to realize reciprocating motion. The device also includes a first stepping motor and a third stepping motor, the first stepping motor drives the air compressor to work, and the third stepping motor drives the plunger pump to work.

The advantage of technical scheme of the present invention is:

Through the transparent cylinder head, it is possible to directly observe (or take pictures with a camera) the physical properties of the ionic liquid layer in the cylinder when the long piston compresses the high-pressure gas, and the physical property changes that occur with the change of the gas pressure. The impact of the ionic liquid on the performance of the hydrogen compressor during the reciprocating motion of the hydrogen compressor piston under different pressure states can be obtained; it can be used to study the impact of the high-pressure ionic liquid on the sealing and lubrication performance when the high-pressure ionic liquid moves with the long piston.

The performance test device of the simulated ionic liquid hydrogen compressor of the present invention can perform safe and effective tests within the range of 45MPa, has a wide pressure range, and can fully meet the test requirements.

Description of drawings

Fig. 1 is the overall structural representation of test device of the present invention;

In the figure: 1, the first stepping motor, 2, the air compressor, 3, the first pressure gauge, 4, the safety valve, 5, the first regulating valve, 6, the second regulating valve, 7, the gas storage tank, 8, the air valve, 9, the cylinder head, 10, the pressure sensor, 11, the temperature sensor, 12, the ionic liquid layer, 13, the cylinder, 14, the long piston, 15, the crosshead, 16, the crankcase, 17, the second stepping motor, 18, the accumulator, 19, the plunger pump, 20 , ionic liquid for replenishment, 21, ionic liquid storage tank, 22, third regulating valve, 23, fourth regulating valve, 24, third stepping motor, 25, ionic liquid chamber, 26, first sealing ring, 27, second sealing ring, 28, second pressure gauge.

Detailed ways

Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. According to these detailed descriptions, those skilled in the art can clearly understand the present application and can implement the present application. Without departing from the principle of the present application, the features in different embodiments can be combined to obtain new implementations, or some features in certain embodiments can be replaced to obtain other preferred implementations.

Referring to Fig. 1, it is the overall structure schematic diagram of the test device of the present invention, the performance test device of the simulated ionic liquid hydrogen compressor of the present invention, comprises three parts of cylinder assembly, gas pressure supply assembly and ionic liquid pressure supply assembly;

Described cylinder assembly comprises cylinder 13, and described cylinder 13 one ends are fixedly installed on the crankcase 16, and the other end of cylinder 13 is closed by cylinder cover 9, and described cylinder cover 9 adopts plexiglass material or other pressure-resistant transparent material, can directly observe cylinder 13 internal conditions through cylinder cover 9 for test personnel or high-speed camera, and described cylinder cover 9 is installed on the cylinder 13 detachably by bolt; The second stepping motor 17 drives the crank connecting rod structure to move, and the connecting rod end of the crank connecting rod structure is connected to the connecting rod at the end of the long piston 14 through the crosshead 15, so that driven by the second stepping motor 17, the crank connecting rod structure drives the long piston 14 to reciprocate, so as to compress the medium in the space between the long piston 14 and the cylinder head 9 in the cylinder 13.

The gas pressure supply assembly includes a first stepping motor 1, an air compressor 2 and an air storage tank 7. The air compressor 2 is connected to the opening of the cylinder head 9 through a pipeline, and an air valve 8 is arranged at the opening of the cylinder head 9. The air valve 8 controls the air passage connection between the air compressor 2 and the inner space of the cylinder 13. The air storage tank 7 is arranged between the air compressor 2 and the air valve 8 for storing and buffering the high-pressure gas provided by the air compressor 2. The inlet of the air storage tank 7 is provided with a first regulating valve 5 The outlet of the gas storage tank 7 is provided with a second regulating valve 6, and the gas storage tank 7 is also provided with a first pressure gauge 3 and a safety valve 4. The opening of the cylinder head 9 is also provided with a pressure sensor 10 and a temperature sensor 11 inside the cylinder 13 for real-time monitoring of gas state changes inside the cylinder 13. The pressure sensor 10 and temperature sensor 11 can also be arranged at a position near the cylinder head 9 on the inner wall of the cylinder 13.

The ionic liquid pressure supply assembly includes an ionic liquid storage tank 21, a plunger pump 19, a third stepper motor 24, and an accumulator 18. The accumulator 18 is connected to the plunger pump 19 and the ionic liquid storage tank 21 in sequence through a liquid supply pipeline. The accumulator 18 is also connected to an ionic liquid chamber 25 formed in an annular gap formed on the outer periphery of the long piston 14 through a liquid supply pipeline. The pressurization in the ionic liquid storage tank 21 is delivered to the accumulator 18 and the ionic liquid chamber 25, and the third stepper motor 24 is used to drive the plunger pump 19 to work. Referring to Fig. 1, a third regulating valve 22 is arranged on the liquid supply line between the accumulator 18 and the ionic liquid chamber 25, a fourth regulating valve 23 is arranged on the liquid supply line between the accumulator 18 and the plunger pump 19, and a second pressure gauge 28 is also provided on the accumulator 18, and the pressure of the ionic liquid in the ionic liquid chamber 25 is detected and stabilized by the accumulator 18 and the second pressure gauge 28.

Referring to Fig. 1, the outer peripheral surface of the middle section of the long piston 14 is recessed towards the inside to form an ionic liquid chamber 25 between the long piston 14 and the inner wall of the cylinder 13. The axial length of the ionic liquid chamber 25 is such that when the long piston 14 reciprocates, the liquid supply line always keeps the ionic liquid chamber 25 in communication with the accumulator 18; Both the sealing ring 26 and the second sealing ring 27 are arranged in the groove on the outer peripheral surface of the long piston 14 . The first stepping motor 1 drives the air compressor 2 to work, and the air compressor 2 provides high-pressure air to make the space between the upper end of the long piston 14 in the cylinder 13 and the cylinder head 9 pressurized and maintain the pressure required for the test.

The performance test device of the simulated ionic liquid hydrogen compressor of the present invention has two test states. In the first test state, an appropriate amount of ionic liquid is filled in the space between the upper part of the long piston 14 and the cylinder head 9, so that the ionic liquid layer 12 is formed on the upper part of the long piston 14, the air compressor 2 is started, the pressure value of the first pressure gauge 3 on the air storage tank 7 is supplied to the test pressure, the first regulating valve 5 is closed, and the air valve 8 is opened to pressurize the space where the ionic liquid layer 12 is located. The air compressor 2 can directly extract air and compress it to replace hydrogen. Carry out a test to observe the state change of the ionic liquid under the same pressure value. Of course, the hydrogen tank can also be connected externally to the inlet pipe of the air compressor 2, so as to directly use high-pressure hydrogen for testing. The gas storage tank 7 plays the role of temporarily storing hydrogen in the intermediate process at the same time; then close the gas valve 8. During the reciprocating movement of the long piston 14, observe the ionic liquid itself. 11 Real-time monitoring of gas state changes inside the cylinder 13, so that the corresponding relationship between gas state changes and ionic liquid state changes can be compared.

The second test state is used to study the sealing performance and lubricating performance of the pressurized ionic liquid in the ionic liquid chamber 25 when it reciprocates with the long piston. Specifically, the third stepping motor 24 drives the plunger pump 19 to work, and injects the pressurized ionic liquid into the ionic liquid chamber 25. After the value of the second pressure gauge 28 reaches the test set pressure, the plunger pump 19 and the fourth regulating valve 23 are closed. During the reciprocating movement of the long piston 14, the pressure fluctuation of the pressurized ionic liquid in the ionic liquid chamber 25 is monitored by the second pressure gauge 28 When the pressure is less than the set threshold, it is judged that the seal ring leaks and fails to verify the sealing effect of the first and second seal rings. The types of the first seal ring and the second seal ring can be replaced during the test, such as O-rings, V-rings, composite seals and other seals of different types and materials. At the same time, the first seal ring and the second seal ring can be set as two or three. Correspondingly, one to three annular grooves for installing the first seal ring are reserved at the corresponding position above the outer peripheral surface of the long piston, and one to three annular grooves are reserved at the corresponding position below the outer peripheral surface of the long piston. Three annular grooves for the second sealing ring. Moreover, the second stepping motor 17 can be used to control the reciprocating frequency of the long piston 14, adjust the test cycle, and explore the failure life of different types of sealing rings under different pressure ionic liquids and the pressure resistance performance under the sealing requirements. The accumulator 18 not only monitors the pressure change of the ionic liquid in the ionic liquid chamber 25, but also uses the energy of the accumulator 18 to ensure the normal pressure of the entire test device and ensure the safety of the test when the test device works abnormally and causes an instantaneous pressure increase.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or deformations that those skilled in the art can make without creative labor are still within the protection scope of the present invention.

Claims (10)

1. The performance test device for the simulated ionic liquid hydrogen compressor is characterized by comprising a cylinder and an air compressor, wherein one end of the cylinder is sealed by a cylinder cover made of transparent materials, a long piston is arranged in the cylinder, and the long piston is driven to reciprocate in the cylinder along the inner wall surface of the cylinder so as to compress medium in a space among the end surface of the long piston, the inner wall surface of the cylinder and the inner wall surface of the cylinder cover;

the cylinder cover is provided with a through hole, the air compressor is communicated to the through hole of the cylinder cover through a gas pipeline, and the air compressor is used for providing pressurized gas in the space among the end face of the long piston, the inner wall face of the cylinder and the inner wall face of the cylinder cover; the air cylinder is characterized in that an air storage tank is further connected in series to an air pipeline between the air compressor and the cylinder cover, a safety valve and a first pressure gauge are arranged on the air storage tank, and a pressure sensor and a temperature sensor are arranged at a through hole of the cylinder cover and located inside the cylinder.

2. The device of claim 1, further characterized in that the peripheral surface intermediate section of the long piston is recessed toward the radial inner side, the recess forms an ionic liquid chamber, the interior of the ionic liquid chamber is filled with pressurized ionic liquid, and a first sealing ring and a second sealing ring are further arranged between the peripheral surface of the long piston and the inner wall surface of the cylinder, the first sealing ring is located above the ionic liquid chamber, and the second sealing ring is located below the ionic liquid chamber.

3. The device of claim 2, further characterized by comprising an accumulator, a plunger pump and an ionic liquid storage tank, wherein the ionic liquid cavity is sequentially communicated with the accumulator, the plunger pump and the ionic liquid storage tank through a liquid supply pipeline, and the plunger pump is used for pressurizing and conveying the ionic liquid for replenishing in the ionic liquid storage tank to the interior of the accumulator and the ionic liquid cavity.

4. A device according to any one of claims 1-3, further characterized in that a gas valve for controlling the on-off of the gas line is provided at the through hole of the cylinder head.

5. A device according to claim 3, further characterized in that the accumulator has a second pressure gauge mounted thereon.

6. The device of claim 2, further characterized in that the first and second sealing rings are each mounted in an annular groove formed in the outer peripheral surface of the long piston, one to three annular grooves being provided at the location where the first sealing ring is mounted on the outer peripheral surface of the long piston, and one to three annular grooves being also provided at the location where the second sealing ring is mounted on the outer peripheral surface of the long piston.

7. A device according to any one of claims 1-3, further characterized in that a first regulating valve for controlling the on-off of the gas pipeline is arranged at the inlet of the gas tank, and a second regulating valve for controlling the on-off of the gas pipeline is arranged at the outlet of the gas tank.

8. The device according to claim 3 or 5, further characterized in that a third regulating valve for controlling the on-off of the liquid supply pipeline is arranged between the energy accumulator and the ion liquid cavity, and a fourth regulating valve for controlling the on-off of the liquid supply pipeline is arranged between the energy accumulator and the plunger pump.

9. A device according to any one of claims 1 to 3, further characterized in that the cylinder is mounted on a crankcase in which a second stepper motor is mounted, the second stepper motor driving the crank of a crank-link structure to rotate, the links of the crank-link structure being connected to the long piston by means of a cross-head, such that the second stepper motor drives the long piston to perform a reciprocating motion.

10. The apparatus of claim 3 further comprising a first stepper motor and a third stepper motor, said first stepper motor driving said air compressor and said third stepper motor driving said plunger pump.