Helium compressor with double exhaust pressure
By introducing a jet enthalpy-increasing pipe and a flow regulating valve into the scroll helium compressor, the pressure loss of the GM refrigeration unit under varying operating conditions was reduced and the equipment was simplified, thus solving the problem of energy waste caused by the difference in compressor discharge pressure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CSIC PRIDE (NANJING) CRYOGENIC TECHNOLOGY CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-08-04
AI Technical Summary
When the existing scroll helium compressor is operating under varying conditions in the GM refrigeration unit, the compressor discharge pressure differs too much from the pressure required for the cold helium circulation, resulting in pressure loss and energy waste.
Design a helium compressor with dual exhaust pressure. The compressor supplies gas to the system through a jet enthalpy-enhancing pipe. Using the jet enthalpy-enhancing pipe and a flow regulating valve, two different exhaust pressures are output from the vortex compressor exhaust port and the jet enthalpy-enhancing pipe, respectively, to reduce pressure loss.
While ensuring differential pressure oil supply, it reduces pressure loss from helium discharge, simplifies equipment structure, and lowers costs.
Smart Images
Figure CN224592342U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a helium compressor, and more particularly to a dual-exhaust-pressure helium compressor. Background Technology
[0002] As a type of rotary machinery, scroll compressors have advantages such as simple structure, small size, light weight, few vulnerable parts, high reliability, zero clearance volume, low leakage and high volumetric efficiency, continuous intake and exhaust process with small pressure pulsation and low vibration and noise. Therefore, they are increasingly widely used in various types of air conditioning and refrigeration units.
[0003] The scroll helium compressor is the core power source of GM refrigeration units. When GM refrigeration units operate under varying conditions, the helium compressor needs to change the speed of the scroll compressor according to the load or terminal control. If the compressor discharge pressure differs too much from the required pressure for cold helium circulation, it will cause a significant pressure loss and waste energy. Utility Model Content
[0004] Purpose of the utility model: The purpose of this utility model is to provide a helium compressor with dual exhaust pressure to reduce pressure loss.
[0005] Technical Solution: The present invention relates to a dual-exhaust-pressure helium compressor, comprising a scroll compressor. One end of the scroll compressor near the scroll plate has a return gas pipe and a jet enthalpy-increasing pipe, while the opposite end has an oil outlet. The jet enthalpy-increasing pipe is connected to an exhaust pipe and a secondary exhaust pipe for discharging compressed gas. The oil outlet is connected to the return gas pipe via the oil outlet pipe. The exhaust pipe and the secondary exhaust pipe are respectively connected to a first heat exchanger and a second heat exchanger. The secondary exhaust pipe downstream of the second heat exchanger is equipped with a first flow regulating valve.
[0006] Preferably, the air return pipe inlet is connected to a gas-liquid mixing atomizer, one inlet of which is connected to the air inlet port via an air inlet pipe, and the other inlet is connected to the oil outlet via an oil outlet pipe.
[0007] Preferably, the jet enthalpy-enhancing tube is connected to the intermediate pressure chamber of the vortex disk.
[0008] Preferably, the air intake pipe connects to the first pressure sensor and the buffer tank in series from the air intake port, and then to the gas-liquid mixing atomizer.
[0009] Preferably, the exhaust pipe starts from the exhaust port end, and sequentially connects the temperature sensor, the first heat exchanger, the second pressure sensor, the first oil separator, and the first adsorber, and then connects to the exhaust port for connecting to the GM refrigerator; the auxiliary exhaust pipe starts from the jet enthalpy-enhancing pipe end, and sequentially connects the second heat exchanger, the third pressure sensor, the second oil separator, and the second adsorber, and then connects to the auxiliary exhaust port for connecting to the cold head heat exchanger.
[0010] Preferably, an auxiliary air intake pipe for connecting to the cold head heat exchanger is connected to the air intake pipe upstream of the first pressure sensor.
[0011] Preferably, the auxiliary exhaust pipe and the auxiliary intake pipe are connected to a third heat exchanger, where energy is exchanged.
[0012] Preferably, the first heat exchanger and the second heat exchanger are connected in series.
[0013] Preferably, the oil drain line starts from the oil drain port end, and connects in series with the first heat exchanger, the first filter, and the first throttling orifice, and then connects to the gas-liquid mixing atomizer. The oil drain line is connected to an oil replenishment port, which is located upstream of the first heat exchanger.
[0014] Preferably, a safety valve is provided on the air guide pipe between the first oil separator and the first adsorber. The air guide pipe is connected to the air inlet pipe. A one-way valve and a second flow regulating valve are provided between the air guide pipe and the air inlet pipe. The one-way valve and the second flow regulating valve are connected in parallel. The air guide pipe is connected to the air inlet pipe upstream of the first pressure sensor. The oil outlets of the first oil separator and the second oil separator are respectively connected to the air inlet pipe. A second filter, a second throttling orifice, a third filter, and a third throttling orifice are respectively provided between the oil outlets of the first oil separator, the oil outlets of the second oil separator, and the air inlet pipe. The oil outlets of the first oil separator and the second oil separator are connected to the air inlet pipe downstream of the buffer tank.
[0015] Beneficial effects: Compared with the prior art, this utility model has the following significant advantages: 1. Reduced pressure loss: Based on the use of only one vortex pressure pack, the system is improved by changing the jet enthalpy enhancement structure inside the vortex pressure pack to a vortex pressure pack. By supplying gas to the system through the jet enthalpy enhancement pipe, the outlet pipeline route of the jet enthalpy enhancement pipe is changed. Using the jet enthalpy enhancement pipe and flow regulating valve, two different exhaust pressures are output from the exhaust port of the vortex pressure pack and the jet enthalpy enhancement pipe, respectively. While ensuring differential pressure oil supply, the pressure loss of discharged helium is reduced; 2. Simplified equipment and reduced cost. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a helium compressor with intermediate extraction and dual exhaust pressure provided in an embodiment of this application;
[0017] Figure 2 This is a schematic diagram showing the corresponding positions of the vortex disk back pressure hole and the jet enthalpy-enhancing pipe provided in the example of this application;
[0018] Figure 3 This is a p-θ curve of the scroll disk pressure versus the corresponding position provided in this application example. Detailed Implementation
[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings.
[0020] like Figure 1 As shown, a dual-exhaust-pressure helium compressor 1 provided in this embodiment of the application is mainly composed of a scroll compressor 2 and a jet enthalpy-enhancing pipe 3.
[0021] The vortex compressor 2 has a return air port 4 at one end near the vortex disc 6, and an oil drain port 15 at the opposite end. An exhaust port 14 is located between the return air port 4 and the oil drain port 15. The return air port 4 is connected to the gas-liquid mixing atomizer 20. The gas-liquid mixing atomizer 20 has two inlets: one inlet is connected to the air inlet port 37 via an air inlet pipe, and the other inlet is connected to the oil drain port 15 via an oil drain pipe. The exhaust port 14 is connected to an exhaust pipe. The air inlet port 37 and the exhaust pipe are used to connect to the GM cooling unit. After the air inlet port 37 and the exhaust pipe are connected to the GM cooling unit, the following cycle can be formed:
[0022] After helium performs work in the GM refrigerator, it is introduced into the gas-liquid mixing atomizer 20 through the inlet port 37 and the inlet pipe. The oil inside the vortex pressure tank 2 is introduced into the gas-liquid mixing atomizer 20 through the oil drain pipe. The two gases are fully atomized in the gas-liquid mixing atomizer 20 to form an oil-gas mixture. The oil-gas mixture enters the vortex pressure tank 2 through the return port 4. After being pressurized by the vortex disk 6, the oil and gas are separated under the action of gravity. The gas is led out through the exhaust port 14. The lubricating oil droplets pass through the gap between the motor rotor 8 and the motor stator coil 9 and the gap between the motor stator silicon steel sheet 10 and the shell 5 of the vortex pressure tank 2 under the action of gravity, and finally deposit at the bottom of the vortex pressure tank 2 to form a relatively stable oil surface 11. The lubricating oil can absorb some of the heat of the motor as it passes through the vortex pressure tank 2, which plays a role in cooling the motor. The lubricating oil deposited at the bottom of the vortex pressure tank 2 enters the oil drain pipe through the oil drain port 15.
[0023] The lubricating oil at the bottom of the vortex press 2 is connected to the intermediate pressure chamber through the lower rotating shaft 12 and the oil suction port 13. Under the action of pressure difference, the lubricating oil cools the motor and lubricates the press components from bottom to top, as shown by the arrow in the figure.
[0024] The jet enthalpy-enhancing pipe 3 is located at one end of the vortex pressure tank 2 near the vortex disk 6 and is connected to the middle pressure chamber of the vortex disk 6. The port of the jet enthalpy-enhancing pipe 3 extending out of the housing 5 is connected to a secondary exhaust pipe. The secondary exhaust pipe is used to connect to another load, such as the cold head heat exchanger 42, to provide cooling capacity to the object 43 being cooled, so as to export the pressure in the vortex pressure tank 2 that is not compatible with the GM refrigeration unit and serve as a cold source for other loads to reduce pressure loss.
[0025] The specific location of the jet enthalpy-enhancing tube 3 is determined based on the pressure derived from the required parameters, and the determination method is as follows:
[0026] like Figure 2 As shown, the scroll disk 6 consists of a fixed scroll body and a moving scroll body. Both the fixed and moving scroll bodies have helical profiles and mesh with each other, installed eccentrically at a 180° angle. 6a is the medium-high pressure chamber formed by the scroll disk 6, 6b is the high pressure chamber formed by the scroll disk 6, and 6c is the location of the back pressure hole of the scroll disk, specifically at the intermediate pressure point during the compression process. The chamber connected to it is the medium pressure chamber of the pressure pack.
[0027] Figure 3 To show the relationship between pressure and crankshaft angle, P in the figure... in and P out These represent the pressures corresponding to the low-pressure inlet and high-pressure exhaust outlet of the vortex pressure pack 2, respectively. The rotation angles of the vortex disk 6, from left to right along the coordinate axis, are the crankshaft rotation angle of the crescent-shaped space between the outermost moving and stationary vortex bodies, the third chamber, the second chamber, and the first chamber. The crankshaft rotation angle of each part is 360°. x The exhaust pressure required for the cold helium cycle is determined by P. x Find the corresponding turning angle θ at the position on the curve. x Then, the specific location for installing the jet enthalpy-enhancing tube can be obtained, and the corresponding model of the vortex press can be selected according to the corresponding location. For example, the jet enthalpy-enhancing tube is arranged at the low-pressure chamber pressure of the vortex plate in the vortex press where the pressure is equal to 8 bar. After being compressed by the vortex plate 6, when the pressure reaches 8 bar, it is discharged through the jet enthalpy-enhancing tube 3.
[0028] Helium gas at the pressure corresponding to the scroll plate is discharged from 6a into the circulation system of the cold head heat exchanger 42. The remaining helium gas is further compressed and pressurized, and then discharged into the high-pressure chamber of the scroll plate at 6b.
[0029] The auxiliary exhaust pipe starts from the jet enthalpy-enhancing pipe 3, and connects in series with the heat exchanger 18, flow regulating valve 40, pressure sensor 25, oil separator 30, and adsorber 36, and then connects to the cold head heat exchanger 42 through the auxiliary exhaust port 48.
[0030] The air intake pipe starts from the air intake port 37, and connects in series with the pressure sensor 31, the buffer tank 29, and then to the gas-liquid mixing atomizer 20. The air intake port 37 is used to connect to the GM refrigerator. The buffer tank 29 plays a buffering role. The air intake pipe is connected to the make-up air pipe 38.
[0031] The oil drain line starts from the oil drain port 15, and connects in series with the heat exchanger 17, the filter 19, the throttling orifice 44, and then connects to the gas-liquid mixing atomizer 20. The oil drain line is connected to the oil replenishment port 16, which is located upstream of the heat exchanger 17.
[0032] The exhaust pipe starts from the exhaust port 14 end, and connects in series with the temperature sensor 21, heat exchanger 17, pressure sensor 24, oil separator 28, and adsorber 35, and then connects to the exhaust port 39, which is used to connect to the GM refrigeration unit.
[0033] Oil separators 28 and 30 are used to separate oil mist from helium gas. A safety valve 33 is installed on the gas guide pipe between oil separator 28 and adsorber 35. The gas guide pipe is connected to the air inlet pipe. A one-way valve 32 and a flow regulating valve 34 are installed between the gas guide pipe and the air inlet pipe. The one-way valve 32 and the flow regulating valve 34 are connected in parallel. The gas guide pipe is connected to the air inlet pipe upstream of the pressure sensor 31. The oil outlets of oil separators 28 and 30 are respectively connected to the air inlet pipe, and the oil is introduced into the gas-liquid mixing atomizer 20 through the air inlet pipe. The oil outlets of oil separators 28 and 30 are connected to the air inlet pipe downstream of buffer tank 29. A filter 26, a throttle orifice 45, a filter 27, and a throttle orifice 46 are respectively provided between the oil outlet of oil separator 28, the oil outlet of oil separator 30 and the air inlet pipe. The oil discharged from oil separators 28 and 30 mixes with the helium gas discharged from buffer tank 29 to form an oil-gas mixture.
[0034] Adsorbers 35 and 36 are used to carry oil adsorption in the helium gas at the oil separator outlet.
[0035] Heat exchangers 17 and 18 are connected in series. Temperature sensors 22 and 23 are respectively installed at the cooling water inlet of heat exchanger 17 and the cooling water outlet of heat exchanger 18. Low-temperature cooling water enters through the inlet of temperature sensor 23, passes through heat exchanger 18 and heat exchanger 17 in sequence, and is discharged through the outlet of temperature sensor 22. The cooling water circulation is used to cool and reduce the temperature of the two circulating helium gas.
[0036] An auxiliary air intake pipe is connected to the upstream air intake pipe of the pressure sensor 31. The auxiliary air intake pipe is used to connect to the cold head heat exchanger 42.
[0037] The auxiliary exhaust pipe and auxiliary intake pipe are connected to the heat exchanger 47. Before the helium gas discharged from the adsorber 36 enters the cold head heat exchanger 42, and before the helium gas inside the auxiliary intake pipe enters the intake pipe, the auxiliary exhaust pipe and the auxiliary intake pipe exchange energy in the heat exchanger 47.
Claims
1. A helium compressor of dual exhaust pressure comprising a scroll wrap, characterized by, The vortex compressor (2) has a return gas pipe (4) and a jet enthalpy-increasing pipe (3) at one end near the vortex disk (6), and an oil drain port (15) at the other end. There is an exhaust port (14) between the return gas pipe (4) and the oil drain port (15). The jet enthalpy-increasing pipe (3) and the exhaust port (14) are respectively connected to an exhaust pipe and a secondary exhaust pipe for discharging compressed gas. The oil drain port (15) is connected to the return gas pipe (4) through the oil drain pipe. The exhaust pipe and the secondary exhaust pipe are respectively connected to the first heat exchanger (17) and the second heat exchanger (18). The secondary exhaust pipe downstream of the second heat exchanger (18) is equipped with a first flow regulating valve (40).
2. The helium compressor with dual exhaust pressure according to claim 1, wherein the inlet of the return pipe (4) is connected to a gas-liquid mixing atomizer (20), one inlet of the gas-liquid mixing atomizer (20) is connected to the air inlet port (37) through the air inlet pipe, and the other inlet is connected to the oil outlet (15).
3. The helium compressor of claim 1, wherein, The jet enthalpy-enhancing pipe (3) is connected to the intermediate pressure chamber of the vortex disk (6).
4. The helium compressor of claim 2, wherein, The air intake pipe starts from the air intake port (37), and connects in series with the first pressure sensor (31), the buffer tank (29), and then to the gas-liquid mixing atomizer (20).
5. The helium compressor of claim 4, wherein, The first pressure sensor (31) has an auxiliary air intake pipe connected to the upstream air intake pipe for connecting the cold head heat exchanger.
6. The dual vent pressure helium gas compressor of claim 1, wherein, The exhaust pipe starts from the exhaust port (14) end, and connects in series with the temperature sensor (21), the first heat exchanger (17), the second pressure sensor (24), the first oil separator (28), and the first adsorber (35), and then connects to the exhaust port (39) for connecting to the GM refrigerator; the auxiliary exhaust pipe starts from the jet enthalpy-enhancing pipe (3) end, and connects in series with the second heat exchanger (18), the third pressure sensor (25), the second oil separator (30), and the second adsorber (36), and then connects to the auxiliary exhaust port (48) for connecting to the cold head heat exchanger.
7. The helium compressor of claim 6, wherein, The auxiliary exhaust pipe and auxiliary intake pipe are connected to the third heat exchanger (47), and the auxiliary exhaust pipe and auxiliary intake pipe exchange energy in the third heat exchanger (47).
8. The helium compressor of dual exhaust pressure according to claim 1 or 6, characterized by, The first heat exchanger (17) and the second heat exchanger (18) are connected in series.
9. The helium compressor of claim 4, wherein, The oil drain line starts from the oil drain port (15) end, and connects in series the first heat exchanger (17), the first filter (19), the first throttle orifice (44), and then connects to the gas-liquid mixing atomizer (20). The oil drain line is connected to the oil replenishment port (16), which is located upstream of the first heat exchanger (17).
10. The helium compressor of claim 6, wherein, A safety valve (33) is provided on the air guide pipe between the first oil separator (28) and the first adsorber (35). The air guide pipe is connected to the air inlet pipe. A one-way valve (32) and a second flow regulating valve (34) are provided between the air guide pipe and the air inlet pipe. The one-way valve (32) and the second flow regulating valve (34) are connected in parallel. The air guide pipe is connected to the air inlet pipe upstream of the first pressure sensor (31). The oil outlets of the first oil separator (28) and the second oil separator (30) are respectively connected to the air inlet pipe. A second filter (26), a second throttle orifice (45), a third filter (27), and a third throttle orifice (46) are respectively provided between the oil outlet of the first oil separator (28), the oil outlet of the second oil separator (30), and the air inlet pipe. The oil outlets of the first oil separator (28) and the second oil separator (30) are connected to the air inlet pipe downstream of the buffer tank (29).