阅读说明：本技术 一种气液溶解高能量存储密度液压蓄能器 (Gas-liquid dissolution high-energy storage density hydraulic accumulator ) 是由 周连佺 刘强 张楚 薄晓楠 瞿炜炜 于 2019-11-07 设计创作，主要内容包括：一种气液溶解高能量存储密度液压蓄能器,包括活塞、缸筒、温控装置,活塞装在缸筒内将缸筒分为第一腔体和第二腔体,第一腔体用于容纳液体和气体,该气体可以溶于该液体,第二腔体用于容纳液压油,温控装置安装在缸筒外围,使缸筒内气体温度处于该气体临界温度以上。本发明的一种气液溶解高能量存储密度液压蓄能器,气体被加压可以溶解到液体中。气体承受压力时,其体积减小量包括两部分,其一为气体压缩减小的体积,其二为气体溶解到液体溶剂中的体积,且后者远大于前者。提高了蓄能器的储能密度,减小了蓄能器的容积,节省了占用空间,减少了蓄能器的成本,尤其对于节约移动液压设备有限的工作空间具有重要意义。(The utility model provides a gas-liquid dissolves high energy storage density hydraulic accumulator, includes piston, cylinder, temperature control device, and the piston dress divide into first cavity and second cavity with the cylinder in the cylinder, and first cavity is used for holding liquid and gas, and this gas can be dissolved in this liquid, and the second cavity is used for holding hydraulic oil, and temperature control device installs peripherally at the cylinder, makes the interior gas temperature of cylinder be above this gas critical temperature. According to the gas-liquid dissolved high-energy storage density hydraulic accumulator, gas can be dissolved into liquid after being pressurized. The volume reduction of the gas when subjected to pressure comprises two parts, one being the volume reduced by compression of the gas and the other being the volume of the gas dissolved in the liquid solvent, the latter being much larger than the former. The energy storage density of the energy accumulator is improved, the volume of the energy accumulator is reduced, the occupied space is saved, the cost of the energy accumulator is reduced, and the energy accumulator has important significance for saving the limited working space of the mobile hydraulic equipment.)

1. A gas-liquid dissolution high-energy-storage-density hydraulic accumulator is characterized by comprising a piston, a cylinder barrel and a temperature control device, wherein the piston is arranged in the cylinder barrel and divides the cylinder barrel into a first cavity and a second cavity, the first cavity is used for containing liquid and gas, the gas can be dissolved in the liquid, the second cavity is used for containing hydraulic oil, an inflation hole is formed in the wall of the cylinder barrel at one end of the first cavity, a hydraulic oil port is formed in the wall of the cylinder barrel at one end of the second cavity and used for connecting the second cavity with a hydraulic system outside the cylinder barrel, and the temperature control device is arranged on the periphery of the cylinder barrel and used for regulating and controlling the temperature of the gas in the cylinder barrel so that the temperature of the gas in the cylinder barrel is higher than the;

when energy is stored, hydraulic oil outside the cylinder barrel enters the second cavity through the hydraulic oil port, and when acting force of the hydraulic oil on the piston is larger than that of gas in the first cavity on the piston, the piston compresses the gas in the first cavity to enable the gas to be dissolved in liquid;

when energy is released, the pressure of the external oil way is reduced, the acting force of gas in the first cavity on the piston is larger than the acting force of hydraulic oil on the piston, the piston compresses the hydraulic oil, and the hydraulic oil in the second cavity is discharged from the hydraulic oil port and is supplied to an external hydraulic system for use.

2. The gas-liquid dissolution high-energy-storage-density hydraulic accumulator according to claim 1, wherein the temperature control device is a constant temperature device, and the constant temperature device is used for keeping the temperature of the gas in the cylinder at a set temperature which is 1-4 ℃ higher than the critical temperature of the gas.

3. The gas-liquid dissolution high-energy-storage-density hydraulic accumulator as claimed in claim 2, wherein the thermostatic device is a heat exchanger, and when the temperature of the gas in the cylinder barrel is higher than a set temperature, cold water is introduced into the heat exchanger to dissipate the heat of the gas in the cylinder barrel; when the temperature of the gas in the cylinder barrel is lower than the set temperature, hot water is introduced into the heat exchanger to heat the gas in the cylinder barrel; and when the temperature of the gas in the cylinder barrel is equal to the set temperature, closing the heat exchanger.

4. The gas-liquid dissolution high-energy-storage-density hydraulic accumulator according to claim 2, wherein the thermostatic device comprises a heating device and a cooling device, the heating device is a heat exchanger, the cooling device comprises a finned cooler and a cooling fan, and when the temperature of the gas in the cylinder barrel is higher than a set temperature, the cooling fan is started to blow the finned cooler to dissipate the heat of the gas in the cylinder barrel; when the temperature of the gas in the cylinder barrel is lower than the set temperature, hot water is introduced into the heat exchanger to heat the gas in the cylinder barrel; and when the temperature of the gas in the cylinder barrel is equal to the set temperature, the heating device and the cooling device are closed.

5. The gas-liquid dissolution high energy storage density hydraulic accumulator of claim 1, wherein the gas is CO₂The liquid is acetone or other combination of gas and liquid, the critical temperature of the gas is lower than the using temperature, and the solubility of the gas in the liquid is high.

6. The gas-liquid dissolution high energy storage density hydraulic accumulator of claim 1, wherein the temperature of the first cavity is higher than the critical temperature of gas.

Technical Field

The invention belongs to the field of hydraulic transmission and control, particularly relates to the field of hydraulic energy storage, and particularly relates to a gas-liquid dissolved high-energy storage density hydraulic energy accumulator.

Background

A hydraulic accumulator is an energy storage device in a hydropneumatic system. The energy in the system is converted into compression energy or potential energy to be stored at a proper time, and when the system needs the energy, the compression energy or the potential energy is converted into hydraulic energy or air pressure and the like to be released, and the energy is supplied to the system again. When the instantaneous pressure of the system is increased, the energy of the system can be absorbed, and pressure pulsation is eliminated, so that the normal pressure of the whole system is ensured, and the noise is reduced.

The energy accumulator can be divided into a weight type, a spring type and a gas loading type according to the loading mode, and the gas loading type is most used at present. Gas-loaded accumulators are divided into gas-bag, gas-bottle and piston types. The piston type energy accumulator has oil-gas isolation, reliable operation and long service life, and is suitable for high-pressure and high-capacity energy storage.

The existing piston type energy accumulator uses a piston to isolate oil liquid storing energy from compressed gas, the gas is nitrogen, the volume of the compressed gas is reduced in a certain pressure change range, and the volume of the compressed gas is limited, so that the effective liquid-filled volume stored in the energy accumulator is small, and the main reason for the low energy storage density of the existing energy accumulator is that the effective liquid-filled volume is small. For example, if the volume of the energy storage oil is 30L and the pressure variation range is 14-18MPa, the calculated volume of the energy storage device is 214L and the external volume is 281L. If the mobile equipment uses the piston type energy accumulator to store energy, the large volume occupies large space of the mobile equipment, influences the sight line and has high cost.

Disclosure of Invention

The invention aims to provide a gas-liquid dissolved high-energy storage density hydraulic energy accumulator, which reduces the volume of the prepared energy accumulator and saves the occupied working space by improving the energy storage density of the energy accumulator under the condition of meeting certain energy storage volume and pressure.

In order to achieve the above object, the technical solution of the present invention is as follows:

the utility model provides a gas-liquid dissolves high energy storage density hydraulic accumulator, which comprises a piston, the cylinder, temperature control device, the piston dress divide into first cavity and second cavity with the cylinder in the cylinder, first cavity is used for holding liquid and gas, this gas can be dissolved in this liquid, the second cavity is used for holding hydraulic oil, the hole of aerifing has on the jar bucket wall of first cavity one end, the hydraulic pressure hydraulic fluid port has on the jar bucket wall of second cavity one end, the hydraulic pressure hydraulic fluid port is used for connecting the outside hydraulic system of second cavity and cylinder, temperature control device installs peripherally at the cylinder, be used for regulating and control gaseous temperature in the cylinder, make the interior gas temperature of cylinder be in above this gaseous critical temperature. When energy is stored, hydraulic oil outside the cylinder barrel enters the second cavity through the hydraulic oil port, and when acting force of the hydraulic oil on the piston is larger than that of gas in the first cavity on the piston, the piston compresses the gas in the first cavity to enable the gas to be dissolved in liquid; when energy is released, the pressure of the external oil way is reduced, the acting force of gas in the first cavity on the piston is larger than the acting force of hydraulic oil on the piston, the piston compresses the hydraulic oil, and the hydraulic oil in the second cavity is discharged from the hydraulic oil port and is supplied to an external hydraulic system for use.

Further, the temperature control device is a constant temperature device, and the constant temperature device is used for keeping the temperature of the gas in the cylinder barrel at a set temperature, wherein the set temperature is 1-4 ℃ higher than the critical temperature of the gas.

Further, the constant temperature device is a heat exchanger, and when the temperature of the gas in the cylinder barrel is higher than the set temperature, cold water is introduced into the heat exchanger to dissipate the heat of the gas in the cylinder barrel; when the temperature of the gas in the cylinder barrel is lower than the set temperature, hot water is introduced into the heat exchanger to heat the gas in the cylinder barrel; and when the temperature of the gas in the cylinder barrel is equal to the set temperature, closing the heat exchanger.

Further, the constant temperature device comprises a heating device and a cooling device, the heating device is a heat exchanger, the cooling device comprises a finned cooler and a cooling fan, and when the temperature of the gas in the cylinder barrel is higher than a set temperature, the cooling fan is started to blow the finned cooler to dissipate the heat of the gas in the cylinder barrel; when the temperature of the gas in the cylinder barrel is lower than the set temperature, hot water is introduced into the heat exchanger to heat the gas in the cylinder barrel; and when the temperature of the gas in the cylinder barrel is equal to the set temperature, the heating device and the cooling device are closed.

Further, the gas is CO₂The liquid is acetone or other combination of gas and liquid, the critical temperature of the gas is lower than the using temperature, and the solubility of the gas in the liquid is high.

Further, the temperature of the first cavity is higher than the critical temperature of the gas.

Compared with the prior art, the invention has the beneficial effects that:

according to the gas-liquid dissolved high-energy storage density hydraulic accumulator, gas solute and liquid solvent are filled into one side of the piston accumulator, and if the critical temperature of the filled gas is lower than the use temperature, the gas is pressurized and not liquefied, but can be dissolved into liquid. The volume reduction of the gas when subjected to pressure comprises two parts, one being the volume reduced by compression of the gas and the other being the volume of the gas dissolved in the liquid solvent, the latter being much larger than the former. The gas is completely dissolved in the liquid when the pressure reaches a certain value. Under the condition of meeting the required energy storage volume and pressure, the cylinder barrel can contain more hydraulic oil for energy storage, the energy storage density of the energy accumulator is improved, the volume of the energy accumulator is reduced, the occupied space is saved, the cost of the energy accumulator is reduced, and the hydraulic energy storage device has important significance for saving the limited working space of mobile hydraulic equipment.

Drawings

Fig. 1 is a schematic structural diagram of a gas-liquid dissolved high-energy storage density hydraulic accumulator in embodiment 1 of the present invention;

in fig. 1: 1. a heat exchanger; 2. a cylinder barrel; 3. a finned cooler; 4. a cooling fan; 5. a piston; 6. a first cavity; 7. a second cavity; A. a hydraulic oil port; B. and (4) an air inflation hole.

Detailed Description

The invention is described in detail below with reference to the figures and the specific embodiments.