Vacuumizing system

Abstract

The utility model provides a vacuum-pumping system which comprises a vacuum pump, an oil stopper, an ejector, a gas collection tank and a gas-liquid separator, the vacuum pump is connected with the oil stopper through a vacuum-pumping connecting pipe, the oil stopper is connected with a barrel of an absorber, the oil stopper is connected with the gas collection tank through a first connecting pipe, and the gas collection tank is connected with the ejector through a second connecting pipe. The gas collecting tank is connected with the upper end of the gas-liquid separator through a second connecting pipe, a gas-liquid mixing outlet of the ejector is connected with the gas-liquid separator, and the ejector is connected with a barrel of the absorber. According to the vacuumizing system, the lithium bromide absorption heat pump / refrigerating machine can keep good vacuum performance, and therefore the performance and the service life of components of a unit are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of vacuum equipment technology, and in particular to a vacuum system. Background Technology

[0002] Lithium bromide absorption heat pumps / refrigeration units, as vacuum devices, employ an absorption cycle using lithium bromide-water as the working fluid. The generation and absorption of the lithium bromide solution, as well as the condensation and evaporation of the refrigerant, all require a vacuum environment. If the vacuum level is insufficient, the non-condensable gases inside the unit will hinder heat and mass transfer in the absorption cycle, leading to a decline in unit performance. Therefore, maintaining a good vacuum is crucial to ensuring the absorption heat pump's optimal thermodynamic performance. Secondly, the main materials of absorption heat pump units are alloys, and lithium bromide, as a salt, is highly corrosive to these metals under aerobic conditions. When the vacuum level is insufficient, the oxygen contained in the non-condensable gases makes the heat transfer tubes, cylinder, and other materials more susceptible to corrosion from the lithium bromide solution, affecting the component performance and lifespan of the unit.

[0003] To solve the above problems, in addition to strictly controlling the welding process and strictly detecting helium leaks during the manufacturing stage to ensure a low leakage rate, it is also necessary to design a high-efficiency vacuum system. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum system that enables lithium bromide absorption heat pumps / refrigeration units to maintain good vacuum performance.

[0005] This utility model provides a vacuum system, including a vacuum pump, an oil blocker, an ejector, a gas collection box, and a gas-liquid separator. The vacuum pump is connected to the oil blocker through a vacuum pipe. The oil blocker is connected to the cylinder of an absorber. The oil blocker is connected to the gas collection box through a first connecting pipe. The gas collection box is connected to the upper end of the gas-liquid separator through a second connecting pipe. The gas-liquid mixing outlet of the ejector is connected to the gas-liquid separator. The ejector is connected to the cylinder of the absorber.

[0006] According to the present invention, a vacuum system is provided, wherein a first branch pipe and a second branch pipe are respectively connected to the vacuum pipe connector, and the first branch pipe and the second branch pipe are respectively connected to the oil blocker.

[0007] According to the present invention, a vacuum system is provided in which a three-way solenoid valve is connected to the first branch pipeline, and the three-way solenoid valve is provided with an air connection interface.

[0008] According to the present invention, a vacuum system is provided in which vacuum valves are respectively provided on the first branch pipeline and the second branch pipeline.

[0009] According to the present invention, a vacuum system is provided in which a pressure sensor is connected to the oil blocker.

[0010] According to the present invention, a vacuum system is provided in which a two-way solenoid valve is connected to the first connecting pipe.

[0011] According to the present invention, a vacuum system is provided, wherein a gas collection tank level is installed on the gas collection tank, and the gas collection tank level is set at a height of 100mm on the gas collection tank.

[0012] According to the present invention, a vacuum system is provided, wherein a non-condensable gas alarm level is installed on the gas-liquid separator.

[0013] According to the vacuum system provided by this utility model, a return pipe is also installed on the gas-liquid separator, and the lower end of the return pipe is connected to the bottom of the gas-liquid separator.

[0014] According to the present invention, a vacuum system is provided in which two oil baffles are installed inside the oil blocker, and the extending directions of the two oil baffles intersect each other.

[0015] The vacuum system provided by this invention can extract non-condensable gases or water vapor from the non-condensable gas accumulation zone in the absorber / condenser using an ejector. The extracted non-condensable gases are separated from the ejector liquid in a gas-liquid separator, and the separated gas is stored in a gas collection box. As the amount of non-condensable gas stored in the gas collection box increases, the pressure in the gas collection box will rise, causing the liquid level in the gas-liquid separator to drop. When the liquid level drops to a set level, the vacuum pump can be started for automatic vacuuming. During the vacuum pump's vacuuming of the oil blocker, the pressure inside the oil blocker can be monitored to determine the vacuum level. First, check if the vacuum pump, the oil catcher, and the oil catcher's vacuum sealing performance are normal. Once the vacuum pump's performance and the sealing performance of the oil catcher and the vacuum pump are confirmed to be normal, a vacuuming operation can be performed on the gas collection box to extract the non-condensable gases. After the non-condensable gases are extracted, the liquid level in the gas-liquid separation pipe connected to the gas collection box will rise. After a set time, first shut off the vacuuming of the gas collection box, then shut off the vacuuming of the oil catcher, allowing the vacuum pump to operate directly on atmospheric pressure. After a set time, the vacuum pump will stop working, completing the vacuuming operation. Therefore, the vacuuming system of this invention, through the above-mentioned vacuuming operation, can maintain good vacuum performance in the lithium bromide absorption heat pump / refrigeration unit, thereby ensuring the performance and lifespan of the unit's components. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the vacuum system of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Vacuum pump; 2. Vacuum connection pipe; 3. Three-way solenoid valve; 4. Vacuum valve; 5. Oil blocker; 6. Pressure sensor; 7. Ejector; 8. Non-condensable gas alarm level; 9. Gas collection tank level; 10. Two-way solenoid valve; 11. Gas collection tank; 12. Gas-liquid separator; 13. Return pipe. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figure 1 As shown, the vacuum system of this utility model embodiment includes a vacuum pump 1, an oil blocker 5, an ejector 7, a gas collection box 11, and a gas-liquid separator 12. The vacuum pump 1 is connected to the oil blocker 5 through a vacuum tube 2. The oil blocker 5 is connected to the cylinder of the absorber / condenser. The oil blocker 5 is connected to the gas collection box 11 through a first connecting pipe. The gas collection box 11 is connected to the upper end of the gas-liquid separator 12 through a second connecting pipe. The gas-liquid mixing outlet of the ejector 7 is connected to the gas-liquid separator 12, and the extraction port of the ejector 7 is connected to the cylinder of the absorber / condenser.

[0024] During operation, ejector 7 uses lithium bromide solution or refrigerant water as the ejector power to extract non-condensable gases or water vapor from the non-condensable gas accumulation zone in the absorber / condenser. The extracted non-condensable gases are separated from the ejector liquid in gas-liquid separator 12, and the separated gas is stored in gas collection box 11. As the amount of non-condensable gas stored in gas collection box 11 increases, the pressure in gas collection box 11 will rise, causing the liquid level in gas-liquid separator 12 to drop. When the liquid level drops to the set level, vacuum pump 1 can be started to perform automatic vacuuming. During the vacuuming process of vacuum pump 1 on oil blocker 5, the pressure inside oil blocker 5 can be observed to determine whether the vacuuming pipeline from vacuum pump 1 to oil blocker 5 and the vacuum sealing performance of oil blocker 5 are normal. Once it is confirmed that the performance of the vacuum pump and the sealing of the oil blocker 5 and the gas extraction pipeline are not problematic, a vacuum operation can be performed on the gas collection box 11 to extract the non-condensable gas in the gas collection box 11. After the non-condensable gas in the gas collection box 11 is extracted, the liquid level in the gas-liquid separation pipe 12 connected to the gas collection box 11 will rise. After a set time, the vacuum operation on the gas collection box 11 is turned off first, and then the vacuum operation on the oil blocker 5 is turned off, so that the vacuum pump 1 can directly pump atmospheric air. After a set time, the vacuum pump 1 stops working, and the vacuum operation is completed.

[0025] Therefore, the vacuum system of this utility model embodiment, through the above-mentioned vacuum operation, can maintain good vacuum in the lithium bromide absorption heat pump / refrigeration unit, thereby ensuring the performance and lifespan of the unit's components.

[0026] Specifically, a first branch pipe and a second branch pipe are connected to the vacuum connection pipe 2, and the first and second branch pipes are respectively connected to the oil stopper 5. A three-way solenoid valve 3 with an air connection interface is connected to the first branch pipe. Vacuum valves 4 are respectively installed on the first and second branch pipes.

[0027] Specifically, a pressure sensor 6 is connected to the oil blocker 5 to detect the pressure inside the oil blocker 5.

[0028] Specifically, a two-way solenoid valve 10 is connected to the first connecting pipe to control the connection between the oil blocker 5 and the air collection box 11.

[0029] Specifically, a gas collecting tank level 9 is installed on the gas collecting tank 11. The gas collecting tank level 9 is set at a height of 100mm in the gas collecting tank 11. The gas collecting tank level 9 can be used to determine whether the liquid level in the gas collecting tank 11 has reached the set liquid level.

[0030] Specifically, a non-condensable gas alarm level 8 is installed on the gas-liquid separator 12. The non-condensable gas alarm level 8 can be used to determine whether the liquid level in the gas-liquid separator 12 has reached the set alarm level.

[0031] Specifically, a return pipe 13 is also installed on the gas-liquid separator 12. The lower end of the return pipe 13 is connected to the bottom of the gas-liquid separator 12. The return pipe 13 is used to return the ejector liquid from the ejector 7 to the solution in the absorber / generator or the refrigerant water in the evaporator / condenser.

[0032] The gas-liquid separator 12 consists of two round tubes, one inside and one outside, and the gas-liquid mixing outlet of the ejector 7 is connected to the inner tube of the gas-liquid separator 12.

[0033] Two oil baffles are installed inside the oil baffle 5, and the extension directions of the two oil baffles intersect each other.

[0034] Specifically, it also includes an automatic control system, which controls the operation of various valves in the vacuum system and the vacuum pump.

[0035] The working principle of the vacuum system in this embodiment of the invention is as follows:

[0036] Ejector 7 uses lithium bromide solution or refrigerant water as the ejector power to extract non-condensable gases or water vapor from the non-condensable gas accumulation zone in the absorber / condenser. The extracted non-condensable gases are separated from the ejector liquid in the gas-liquid separator 12, and the separated gas is stored in the gas collection box 11. As the amount of non-condensable gas stored in the gas collection box 11 increases, its pressure will rise, causing the liquid level in the gas-liquid separator 12 to drop. When the liquid level drops below the non-condensable gas alarm level 8, an automatic vacuuming operation is initiated.

[0037] The automatic vacuuming process is as follows: First, start vacuum pump 1 and directly evacuate air through the air connection interface of three-way solenoid valve 3. After running for a set time, energize three-way solenoid valve 3, which is connected to vacuum pump 1 through vacuuming pipe 2. Three-way solenoid valve 3 closes the atmospheric branch and opens the branch connected to oil blocker 5, thus evacuating oil blocker 5 through vacuum pump 1. After three-way solenoid valve 3 is energized, if pressure sensor 6 shows that the pressure has dropped to a certain set value within a set time, it indicates that the vacuuming pipeline from vacuum pump 1 to oil blocker 5 and the vacuum sealing performance of oil blocker 5 are normal, and the performance of vacuum pump 1 is normal. If pressure sensor 6 shows that the pressure cannot drop to a certain set value, an alarm message is given, and the performance of vacuum pump and the sealing performance of vacuuming pipeline are checked. Then, the two-way solenoid valve 10 is opened to extract the non-condensable gas from the gas collection box 11. After the non-condensable gas in the gas collection box 11 is extracted, the liquid level in the gas-liquid separation pipe 12 connected to the gas collection box 11 will rise, and the non-condensable gas alarm liquid level 8 will be activated. After the set time is reached, the two-way solenoid valve 10 connected to the gas collection box 11 is closed first, and then the three-way solenoid valve 3 connected to the oil stopper 5 is closed. At this time, the vacuum pump 1 directly pumps atmospheric air. After the set time is reached, the vacuum pump 1 stops working, and the automatic vacuuming operation is completed.

[0038] It should be noted that the above-described automatic vacuuming process is controlled by an automatic control system. The control method of the automatic control system is a conventional technique in existing technology and does not involve any improvement to the method itself. After the above-described evacuation process is completed, the three-way solenoid valve 3 is energized, and the vacuum pump 1 is connected to the atmosphere. This operation has the following advantages:

[0039] 1. After the evacuation is completed, the vacuum pipe 2 between the vacuum pump 1 and the oil blocker 5 is connected to the atmosphere, instead of being in a vacuum state, to prevent the vacuum pump oil from being forced into the vacuum pipe 2 and the oil blocker 5, which are in a vacuum state, by the external atmosphere.

[0040] 2. When vacuum pump 1 starts, the connected pipeline is connected to air, not to a vacuum state, to avoid vacuum pump 1 starting under pressure, which is beneficial to the performance and life of vacuum pump 1.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A vacuum pumping system, characterized in that, The device includes a vacuum pump (1), an oil blocker (5), an ejector (7), a gas collection box (11), and a gas-liquid separator (12). The vacuum pump (1) is connected to the oil blocker (5) through a vacuum pipe (2). The oil blocker (5) is connected to the cylinder of the absorber. The oil blocker (5) is connected to the gas collection box (11) through a first connecting pipe. The gas collection box (11) is connected to the upper end of the gas-liquid separator (12) through a second connecting pipe. The gas-liquid mixing outlet of the ejector (7) is connected to the gas-liquid separator (12). The ejector (7) is connected to the cylinder of the absorber.

2. The vacuum system according to claim 1, characterized in that, A first branch pipe and a second branch pipe are respectively connected to the vacuum pipe (2), and the first branch pipe and the second branch pipe are respectively connected to the oil blocker (5).

3. The vacuum system according to claim 2, characterized in that, A three-way solenoid valve (3) is connected to the first branch pipeline, and the three-way solenoid valve (3) is provided with an air connection interface.

4. The vacuum system according to claim 2, characterized in that, Vacuum valves (4) are respectively installed on the first branch pipeline and the second branch pipeline.

5. The vacuum system according to claim 1, characterized in that, A pressure sensor (6) is connected to the oil blocker (5).

6. The vacuum system according to claim 1, characterized in that, A two-way solenoid valve (10) is connected to the first connecting pipe.

7. The vacuum system according to claim 1, characterized in that, A gas collection tank level (9) is installed on the gas collection tank (11), and the gas collection tank level (9) is set at a height of 100mm on the gas collection tank (11).

8. The vacuum system according to claim 1, characterized in that, A non-condensable gas alarm level (8) is installed on the gas-liquid separator (12).

9. The vacuum system according to claim 1, characterized in that, A return pipe (13) is also installed on the gas-liquid separator (12), and the lower end of the return pipe (13) is connected to the bottom of the gas-liquid separator (12).

10. The vacuum system according to claim 1, characterized in that, Two oil baffles are installed inside the oil baffle (5), and the extension directions of the two oil baffles intersect each other.

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