Test platform and test method for testing a compressor

Abstract

The application provides a test platform and a test method for testing a compressor, the test platform comprising a first heat exchange part, a high-pressure buffer tank, an expansion recompression machine, a second heat exchange part, and a low-pressure buffer tank; the test platform has a closed mode, in which the first heat exchange part, the high-pressure buffer tank, the expansion recompression machine, the compressor, the second heat exchange part, and the low-pressure buffer tank are sequentially connected in series; the first heat exchange part is arranged adjacent to the second heat exchange part; and the test method adopts the test platform. The test platform and the test method for testing the compressor provided by the application reduce the potential safety risk while reducing the cold consumption.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically to a test platform and test method for testing compressors. Background Technology

[0002] Marine compressors, especially those operating in cryogenic conditions, require high reliability. Before leaving the factory, marine cryogenic centrifugal compressors undergo cryogenic gas testing to verify their general mechanical performance, operating clearances, and valve regulation capabilities under low-temperature conditions. For example, when testing marine BOG centrifugal compressors, liquid nitrogen vapor is typically used to cool the compressor. The liquid nitrogen vapor flows naturally into and out of the compressor, with the compressor impeller acting only as a flow path. The flowing cryogenic vapor gradually cools the flow path. This testing method is relatively simple, but it has very low cooling capacity utilization and high safety risks. The cryogenic liquid nitrogen vapor needs to be kept flowing unimpeded at all times to prevent blockages and pressure build-up. The heat exchange time between the flowing cryogenic vapor and the compressor's flow path is short, resulting in poor heat transfer efficiency. A large amount of liquid nitrogen is required to completely cool the compressor's flow path to the test temperature and maintain it for a period of time. During the test, the cryogenic nitrogen flowing out of the compressor outlet is directly vented outdoors, resulting in significant waste of cooling resources and environmental impact. Especially for centrifuge units with a large flow area, the amount of liquid nitrogen required for cryogenic cold gas experiments is even greater. Furthermore, the transportation, storage, and use of liquid nitrogen also pose a series of safety risks to operators. For example, when using liquid nitrogen, it is necessary to prevent thermal shock and liquid splash injuries, avoid inhaling cryogenic vapors, prevent the accumulation of vaporized nitrogen in confined spaces leading to oxygen deficiency, and prevent excessive pressure in containers or pipelines.

[0003] Therefore, how to solve the problems of cold source waste and numerous safety hazards during low-temperature cold air testing of marine cryogenic centrifugal compressors has become an urgent research topic. Summary of the Invention

[0004] The purpose of this invention is to provide a test platform and test method for testing compressors, so as to solve the problems of cold source waste and safety hazards in the low-temperature cold air test of marine cryogenic centrifugal compressors.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A test platform for testing compressors, the test platform comprising a first heat exchange section, a high-pressure buffer tank, an expansion re-compressor, a second heat exchange section, and a low-pressure buffer tank;

[0007] The test platform has a closed mode, in which the first heat exchange section, the high-pressure buffer tank, the expansion section of the expansion recompressor, the compressor, the second heat exchange section, and the low-pressure buffer tank are connected in series; the first heat exchange section and the second heat exchange section are arranged adjacent to each other.

[0008] In some embodiments of the present invention, the test platform further includes an air compressor, a dryer, and a precooler;

[0009] In the closed-loop mode, the air compressor, dryer, and precooler are connected in series between the low-pressure buffer tank and the first heat exchange unit.

[0010] The air compressor is used to increase the pressure of the working fluid, the dryer is used to dry the working fluid, and the precooler is used to cool the pressurized working fluid.

[0011] In some embodiments of the present invention, the expansion recompressor includes an expansion section and a compression section connected to each other, and the test platform further includes a return bypass;

[0012] In the closed-loop configuration, the high-pressure buffer tank, the expansion unit, and the compressor are connected in series.

[0013] In the closed-loop mode, the second heat exchange section, the compression section, and the low-pressure buffer tank are connected in series in sequence, and the second heat exchange section, the reflux bypass, and the low-pressure buffer tank are connected in series in sequence.

[0014] In some embodiments of the present invention, the test platform also has an open mode;

[0015] In the open mode, the inlet of the test platform, the air compressor, the dryer, the precooler, the first heat exchange section, the high-pressure buffer tank, the throttling expansion valve, the second heat exchange section, the reflux bypass, the low-pressure buffer tank, and the outlet of the test platform are connected in series.

[0016] In some embodiments of the present invention, the testing platform further includes a filter;

[0017] In the open mode, the filter is connected in series between the inlet of the test platform and the air compressor.

[0018] In some embodiments of the present invention, the test platform includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, a ninth valve, a tenth valve, and an eleventh valve;

[0019] The first valve is connected in series between the inlet of the test platform and the filter;

[0020] The second valve is connected in series between the high-pressure buffer tank and the throttling expansion valve;

[0021] The third valve is connected in series between the throttling expansion valve and the second heat exchange section;

[0022] The fourth valve is connected in series between the return bypasses of the second heat exchange section;

[0023] The fifth valve is connected in series between the high-pressure buffer tank and the expansion section;

[0024] The sixth valve is connected in series between the second heat exchange section and the compression section;

[0025] The seventh valve is connected in series between the expansion section and the inlet of the compressor;

[0026] The ninth valve is connected in series between the outlet of the compressor and the second heat exchange section;

[0027] The tenth valve is connected in series between the low-pressure buffer tank and the outlet of the test platform;

[0028] The eleventh valve is connected in series between the low-pressure buffer tank and the air compressor;

[0029] Specifically, the valve is switched between open and closed modes to switch between the open mode and the closed mode.

[0030] In some embodiments of the present invention, the test platform further includes a rotary motor;

[0031] The turning motor is connected to and drives the compressor.

[0032] In some embodiments of the present invention, the test platform further includes a twelfth valve;

[0033] The twelfth valve is connected in series between the air compressor and the precooler, and is connected in parallel with the dryer.

[0034] In some embodiments of the present invention, the compressor includes a cryogenic centrifugal compressor.

[0035] In some embodiments of the present invention, the test platform further includes a first one-way shut-off valve, a second one-way shut-off valve, and a third one-way shut-off valve;

[0036] The first one-way shut-off valve is connected in series between the expansion section and the seventh valve;

[0037] The second one-way shut-off valve is connected in series between the compression section and the low-pressure buffer tank;

[0038] The third one-way shut-off valve is connected in series between the compressor outlet and the second heat exchange section.

[0039] To achieve the above objectives, this application also provides the following technical solutions:

[0040] A test method for a test platform for testing compressors, the test method employing the aforementioned test platform and comprising the following steps:

[0041] In closed-loop operation, the test platform is operated in closed-loop mode, and the working fluid flows sequentially through the first heat exchange section, the high-pressure buffer tank, the expansion section of the expansion recompressor, the compressor, the second heat exchange section, and the low-pressure buffer tank to test the compressor.

[0042] In some embodiments of the present invention, the test platform further includes an air compressor, a dryer, a precooler, a fifth valve, a seventh valve, a ninth valve, a second heat exchange section, a fourth valve, a reflux bypass, and an eleventh valve, and the air compressor, the dryer, the precooler, the first heat exchange section, the high-pressure buffer tank, the fifth valve, the expansion recompressor, the seventh valve, the compressor, the ninth valve, the second heat exchange section, the fourth valve, the reflux bypass, the low-pressure buffer tank, the eleventh valve, and the air compressor are connected in series.

[0043] In the closed-loop operation step, the fifth valve, the seventh valve, the ninth valve, the fourth valve, and the eleventh valve are opened to allow the test platform to operate in the closed-loop mode and to test the compressor.

[0044] In some embodiments of the present invention, the test platform further includes a first valve, a second valve, a throttling expansion valve, a third valve, and a tenth valve, and the inlet of the test platform, the first valve, the air compressor, the dryer, the precooler, the first heat exchange section, the high-pressure buffer tank, the second valve, the throttling expansion valve, the third valve, the second heat exchange section, the fourth valve, the reflux bypass, the low-pressure buffer tank, the tenth valve, and the outlet of the test platform are connected in series.

[0045] The test method also includes open operation, the open operation steps of which include opening the first valve, the second valve, the throttling expansion valve, the third valve, the fourth valve and the tenth valve, and closing the fifth valve, the seventh valve, the ninth valve and the eleventh valve;

[0046] The closed-loop operation step further includes closing the first valve, the second valve, the third valve, and the tenth valve.

[0047] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0048] 1. Compared with the existing technology that uses an open system to test compressor performance, which often results in a large waste of cooling resources due to the long cooling process of open systems and also poses safety hazards, the test platform for testing compressors provided by this invention uses a closed system to test the compressor, so that the working fluid circulates internally within the test platform, reducing cooling consumption and potential safety risks.

[0049] 2. The test platform provided by the present invention can achieve "a large adjustable range of temperature at the inlet of the compressor under test", wherein the lowest value of the adjustable range can reach -150℃, and the temperature at the inlet is freely controllable, which can meet the test temperature requirements under different temperature gradients.

[0050] 3. The test platform provided by this invention for testing compressors can meet the needs of different test durations.

[0051] 4. In the low-temperature cold air test process of the prior art, there are often problems such as rotation jamming and rubbing. However, the test platform provided by the present invention uses a rotating motor to drive the compressor under test at low speed. This can avoid the high-speed rotation behavior of the compressor under test from causing adverse interference to the closed system. In addition, the low-speed rotation drive characteristic of the rotating motor is also safer. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 A piping diagram of a test platform for testing compressors provided according to an embodiment of the present invention.

[0054] The main reference numerals in the accompanying drawings of this invention are explained as follows:

[0055] 1-High-pressure buffer tank; 2-Compressor; 3-Low-pressure buffer tank; 4-Air compressor; 5-Dryer; 6-Precooler; 7-Expansion section; 8-Compression section; 9-Return bypass; 10-Throttle expansion valve; 11-Filter; 12-First valve; 13-Second valve; 14-Third valve; 15-Fourth valve; 16-Fifth valve; 17-Sixth valve; 18-Seventh valve; 19-Eighth valve; 20-Ninth valve; 21-Tenth valve; 22-Eleventh valve; 23-Twelfth valve; 24-Turning wheel motor; 25-First one-way shut-off valve; 26-Second one-way shut-off valve; 27-Third one-way shut-off valve; 28-Heat exchanger; 29-Chiller unit. Detailed Implementation

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] The present invention provides a test platform and test method for testing compressors, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of the present invention. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0058] Example 1

[0059] like Figure 1 As shown in some embodiments of the present invention, a test platform for testing compressor 2 includes a first heat exchange section (unlabeled), a high-pressure buffer tank 1, an expansion re-compressor (unlabeled), a second heat exchange section (unlabeled), and a low-pressure buffer tank 3. The test platform has a closed-loop mode, in which the first heat exchange section, the high-pressure buffer tank 1, the expansion re-compressor, the compressor 2, the second heat exchange section, and the low-pressure buffer tank 3 are connected in series. The first heat exchange section and the second heat exchange section are arranged adjacent to each other. Compared with the prior art scheme of testing compressor performance using an open system, which often results in a large waste of cooling resources due to the long cooling process of open systems and also poses safety hazards, the test platform for testing compressors provided by the present invention uses a closed-loop system to test the compressor. The working fluid only circulates internally within the platform, avoiding energy interaction between the working fluid and the external environment, thereby reducing cooling consumption and potential safety risks.

[0060] Specifically, the testing platform provided by this invention utilizes the cooling energy of the cryogenic gas leaving the compressor 2 under test to lower the temperature of the gas about to enter the high-pressure buffer tank 1. This reduces the temperature of the gas entering the high-pressure buffer tank 1 while saving cooling energy and resource consumption. It is understood that the lower the temperature of the working fluid entering the high-pressure buffer tank 1, the lower the temperature at the outlet of the expansion compressor, thereby achieving cryogenic control of the testing platform.

[0061] It is worth noting that the working fluid described in the specification of this invention includes air.

[0062] like Figure 1 As shown, in some embodiments of the present invention, the test platform further includes an air compressor 4, a dryer 5, and a precooler 6; in the closed mode, the air compressor 4, the dryer 5, and the precooler 6 are connected in series between the low-pressure buffer tank 3 and the first heat exchange section; wherein, the air compressor 4 is used to increase the pressure of the working fluid, the dryer 5 is used to dry the working fluid, and the precooler 6 is used to cool the pressurized working fluid.

[0063] like Figure 1 As shown, in some embodiments of the present invention, the expansion recompressor includes an expansion section 7 and a compression section 8 connected to each other, and the test platform further includes a reflux bypass 9; in the closed-loop mode, the high-pressure buffer tank 1, the expansion section 7, and the compressor 2 are connected in series; in the closed-loop mode, the second heat exchange section, the compression section 8, and the low-pressure buffer tank 3 are connected in series, and the second heat exchange section, the reflux bypass 9, and the low-pressure buffer tank 3 are also connected in series. Specifically, the expansion section 7 of the expansion recompressor is equivalent to a throttling expansion valve (JT valve), which generates cooling capacity, and the compression section 8 of the expansion recompressor pressurizes the working fluid, aiming to save energy consumption of the entire cycle system. It is worth noting that the lower the temperature of the working fluid entering the high-pressure buffer tank 1, the lower the temperature at the outlet of the expansion section 7 of the expansion recompressor, thereby achieving low-temperature control of the test platform.

[0064] like Figure 1 As shown, in some embodiments of the present invention, the working fluid leaves the high-pressure buffer tank 1 and enters the expansion section 7, cools down and leaves the expansion section 7, and then enters the compressor 2 under test; in some embodiments of the present invention, the working fluid leaving the second heat exchange section directly enters the compression section 8, and then directly flows to the low-pressure buffer tank.

[0065] It is worth noting that the expansion section 7 in the expansion recompressor can specifically be an expansion impeller, and the compression section 8 can specifically be a compression impeller. The expansion impeller and the compression impeller are connected by a bearing, and the two impellers are coaxial and rotate at the same speed.

[0066] like Figure 1As shown, in some embodiments of the present invention, the test platform also has an open mode; in the open mode, the inlet of the test platform, the air compressor 4, the dryer 5, the precooler 6, the first heat exchange section, the high-pressure buffer tank 1, the throttling expansion valve 10, the second heat exchange section, the reflux bypass 9, the low-pressure buffer tank 3, and the outlet of the test platform are connected in series. Figure 1 As shown, in some embodiments of the present invention, the open system includes a filter 11 for filtering the working fluid from outside the test platform, so as to prevent impurities contained in the external working fluid from damaging the various components inside the test platform, and also to prevent the entry of impurities from affecting the accuracy of the performance test of the compressor 2 and the repeatability of the test results data; the filter 11 is connected in series between the inlet of the test platform and the air compressor 4.

[0067] like Figure 1 As shown, in some embodiments of the present invention, the test platform includes a first valve 12, a second valve 13, a third valve 14, a fourth valve 15, a fifth valve 16, a sixth valve 17, a seventh valve 18, a ninth valve 20, a tenth valve 21, and an eleventh valve 22; the first valve 12 is connected in series between the inlet of the test platform and the filter 11; the second valve 13 is connected in series between the high-pressure buffer tank 1 and the throttling expansion valve 10; the third valve 14 is connected in series between the throttling expansion valve 10 and the second heat exchange section; and the fourth valve 15 is connected in series between the return bypass 9 of the second heat exchange section. The fifth valve 16 is connected in series between the high-pressure buffer tank 1 and the expansion section 7; the sixth valve 17 is connected in series between the second heat exchange section and the compression section 8; the seventh valve 18 is connected in series between the expansion section 7 and the inlet of the compressor 2; the ninth valve 20 is connected in series between the outlet of the compressor 2 and the second heat exchange section; the tenth valve 21 is connected in series between the low-pressure buffer tank 3 and the outlet of the test platform; the eleventh valve 22 is connected in series between the low-pressure buffer tank 3 and the air compressor 4; wherein, switching the opening and closing of the above valves switches between the open mode and the closed mode.

[0068] like Figure 1 As shown, in some embodiments of the present invention, the test platform further includes a rotary motor 24; the rotary motor 24 is connected to and drives the compressor 2. In existing low-temperature cold air testing processes, issues such as rotational jamming and collisions often occur. The test platform provided by the present invention uses a rotary motor 24 to drive the compressor 2 under test at low speed. This avoids the high-speed rotation of the compressor 2 under test from potentially causing adverse interference to the closed system, and the low-speed rotation drive characteristic of the rotary motor 24 is also safer.

[0069] like Figure 1 As shown, in some embodiments of the present invention, the test platform further includes a twelfth valve 23; the twelfth valve 23 is connected in series between the air compressor 4 and the precooler 6, and is connected in parallel with the dryer 5. Specifically, when the test platform operates in a closed-loop system and the parallel operation becomes stable, and the moisture content in the entire closed-loop system drops to the permissible standard or below, the twelfth valve 23 can be opened. This is equivalent to "short-circuiting" the dryer 5, thereby cutting the dryer 5 out of the operating system.

[0070] like Figure 1 As shown, in some embodiments of the present invention, the compressor 2 includes a cryogenic centrifugal compressor 2; it is worth noting that the cryogenic centrifugal compressor can specifically be a marine cryogenic centrifugal compressor. The test platform provided by the present invention solves the problems of cold source waste and safety hazards that exist when marine cryogenic centrifugal compressors conduct cryogenic cold air tests.

[0071] like Figure 1 As shown, in some embodiments of the present invention, the test platform further includes a first one-way shut-off valve 25, a second one-way shut-off valve 26, and a third one-way shut-off valve 27; the first one-way shut-off valve 25 is connected in series between the expansion section 7 and the seventh valve 18; the second one-way shut-off valve 26 is connected in series between the compression section 8 and the low-pressure buffer tank 3; and the third one-way shut-off valve 27 is connected in series between the outlet of the compressor 2 and the second heat exchange section.

[0072] In some embodiments of the present invention, the dryer 5 may be a waste heat regeneration dryer to make full use of waste heat and reduce costs.

[0073] In some embodiments of the present invention, the test platform further includes a chiller unit 29, which provides a cold source to the precooler 6, thereby enabling the precooler 6 to cool the working fluid.

[0074] In some embodiments of the present invention, the test platform can provide refrigeration down to -150°C, and the temperature gradient of the compressor 2 is controllable. The closed system in the test platform is energy-efficient.

[0075] The testing platform provided by this invention can achieve a large adjustable range of temperature at the inlet of the compressor under test, down to -150℃, and the temperature at the inlet is freely controllable, which can meet the test temperature requirements under different temperature gradients; the testing platform provided by this invention for testing compressors can meet the requirements of different test durations.

[0076] Example 2

[0077] In some embodiments of the present invention, a test method for a test platform for testing compressor 2 is provided. The test method uses the test platform as described in Embodiment 1 and includes the following steps: closed-loop operation, in which the test platform is operated in the closed-loop mode, and the working fluid flows sequentially through the first heat exchange section, the high-pressure buffer tank 1, the expansion re-compressor, the compressor 2, the second heat exchange section, and the low-pressure buffer tank 3 to test the compressor 2.

[0078] like Figure 1 As shown, in some embodiments of the present invention, the test platform further includes an air compressor 4, a dryer 5, a precooler 6, a fifth valve 16, a seventh valve 18, a ninth valve 20, a second heat exchange section, a fourth valve 15, a reflux bypass 9, and an eleventh valve 22. The air compressor 4, the dryer 5, the precooler 6, the first heat exchange section, the high-pressure buffer tank 1, the fifth valve 16, the expansion recompressor, the seventh valve 18, the compressor 2, the ninth valve 20, the second heat exchange section, the fourth valve 15, the reflux bypass 9, the low-pressure buffer tank 3, the eleventh valve 22, and the air compressor 4 are connected in series. In the closed-loop operation step, the fifth valve 16, the seventh valve 18, the ninth valve 20, the fourth valve 15, and the eleventh valve 22 are opened to allow the test platform to operate in the closed-loop mode and to test the compressor 2.

[0079] like Figure 1 As shown, in some embodiments of the present invention, the test platform further includes a first valve 12, a second valve 13, a throttling expansion valve 10, a third valve 14, and a tenth valve 21, and the inlet of the test platform, the first valve 12, the air compressor 4, the dryer 5, the precooler 6, the first heat exchange section, the high-pressure buffer tank 1, the second valve 13, the throttling expansion valve 10, the third valve 14, the second heat exchange section, the fourth valve 15, the return bypass 9, the low-pressure buffer tank 3, the tenth valve 21, and the outlet of the test platform are connected in series; the test method further includes open operation, the open operation step including opening the first valve 12, the second valve 13, the throttling expansion valve 10, the third valve 14, the fourth valve 15, and the tenth valve 21, and closing the fifth valve 16, the seventh valve 18, the ninth valve 20, and the eleventh valve 22; the closed operation step further includes closing the first valve 12, the second valve 13, the third valve 14, and the tenth valve 21.

[0080] Example 3

[0081] In some embodiments of the present invention, a test method for a test platform for compressor 2 is provided, the test method employing the methods described in Embodiment 1 and as follows: Figure 1 The test platform shown includes the following steps:

[0082] The first step is to establish an open system. Close valves 16, 17, 18, 22, and 23, and open valves 12, 13, 14, 15, and 21. Start the precooler 6, dryer 5, and air compressor 4. The working fluid entering from the test platform inlet passes through filter 11 and then enters the air compressor 4 for pressurization. The working fluid then enters the dryer 5 for drying. After the pressurized working fluid is cooled to room temperature by the precooler 6, it enters the heat exchanger 28. After the high-pressure room-temperature air is stabilized in the high-pressure buffer tank 1, it flows out through the second valve 13 and the throttling expansion valve 10 and is depressurized and cooled. The cooled atmospheric working fluid enters the heat exchanger 28 through the third valve 14, and then enters the low-pressure buffer tank 3 through the fourth valve 15.

[0083] The second step is to establish a closed-loop balance by gradually adjusting the first valve 12 to increase the pressure in the high-pressure buffer tank 1. After the test platform has stabilized, the tenth valve 21 and the eleventh valve 22 are slowly adjusted to control the working fluid in the low-pressure buffer tank 3 to enter the compressor 2, thereby gradually switching the test platform from open system operation to closed system operation.

[0084] The third step is to switch to the high-efficiency cycle, gradually open the fifth valve 16 and the sixth valve 17, close the second valve 13 and the fourth valve 15, slowly disconnect the throttling expansion valve 10 from the system, and disconnect the expansion re-compressor into the system. It is worth noting that compared with the throttling expansion valve 10, the expansion re-compressor has the advantages of higher energy utilization and stronger cooling capacity of the closed system.

[0085] The fourth step involves connecting compressor 2 to the system. Based on the operation of the closed system, compressor 2 to be tested is gradually connected to the closed system. The turning motor 24 is started, and the seventh valve 18 is gradually opened while the third valve 14 is gradually closed. The temperature at the inlet of compressor 2 is adjusted by controlling the third valve 14 and the seventh valve 18. It is worth noting that the test platform provided by this invention can achieve stepped cooling of the flow passage components of compressor 2 by adjusting the temperature, so that the experimental time is not limited.

[0086] Fifth step, test shutdown. After the above tests are completed, disconnect the cryogenic compressor 2 and the expansion recompressor from the system in sequence, and switch the test platform to open system operation.

[0087] like Figure 1As shown, in some embodiments of the present invention, the test platform further includes a chiller unit 29, which is connected to the precooler 6 and provides chilled water to the precooler 6 to cool the working fluid flowing through it. In this case, the heat input in the closed system is the air compressor 4, and the heat output is the chiller unit 29, the interstage cooler in the air compressor 4, and the cooler in the dryer. The problems within the test platform are regulated by controlling the chiller unit 29.

[0088] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. Furthermore, specific examples have been used in the specification to illustrate the principles and implementation methods of the present invention. The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention, and the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A test platform for testing compressors, characterized in that, The test platform includes a first heat exchange section, a high-pressure buffer tank, an expansion re-compressor, a second heat exchange section, a low-pressure buffer tank, an air compressor, and a filter; The test platform has a closed mode, in which the first heat exchange section, the high-pressure buffer tank, the expansion section of the expansion recompressor, the compressor, the second heat exchange section, and the low-pressure buffer tank are connected in series; the first heat exchange section and the second heat exchange section are arranged adjacent to each other; The test platform also has an open mode; in the open mode, the filter is connected in series between the inlet of the test platform and the air compressor.

2. The testing platform according to claim 1, characterized in that, The testing platform also includes a dryer and a precooler; In the closed-loop mode, the air compressor, dryer, and precooler are connected in series between the low-pressure buffer tank and the first heat exchange unit. The air compressor is used to increase the pressure of the working fluid, the dryer is used to dry the working fluid, and the precooler is used to cool the pressurized working fluid.

3. The testing platform according to claim 2, characterized in that, The expansion recompressor includes an expansion section and a compression section connected to each other, and the test platform also includes a reflux bypass; In the closed-loop configuration, the high-pressure buffer tank, the expansion unit, and the compressor are connected in series. In the closed-loop mode, the second heat exchange section, the compression section, and the low-pressure buffer tank are connected in series in sequence, and the second heat exchange section, the reflux bypass, and the low-pressure buffer tank are connected in series in sequence.

4. The testing platform according to claim 3, characterized in that, The testing platform also has an open mode; In the open mode, the inlet of the test platform, the air compressor, the dryer, the precooler, the first heat exchange section, the high-pressure buffer tank, the throttling expansion valve, the second heat exchange section, the reflux bypass, the low-pressure buffer tank, and the outlet of the test platform are connected in series.

5. The testing platform according to claim 4, characterized in that, The test platform includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, a ninth valve, a tenth valve, and an eleventh valve; The first valve is connected in series between the inlet of the test platform and the filter; The second valve is connected in series between the high-pressure buffer tank and the throttling expansion valve; The third valve is connected in series between the throttling expansion valve and the second heat exchange section; The fourth valve is connected in series between the return bypasses of the second heat exchange section; The fifth valve is connected in series between the high-pressure buffer tank and the expansion section; The sixth valve is connected in series between the second heat exchange section and the compression section; The seventh valve is connected in series between the expansion section and the inlet of the compressor; The ninth valve is connected in series between the outlet of the compressor and the second heat exchange section; The tenth valve is connected in series between the low-pressure buffer tank and the outlet of the test platform; The eleventh valve is connected in series between the low-pressure buffer tank and the air compressor; Specifically, the valve is switched between open and closed modes to switch between the open mode and the closed mode.

6. The test platform according to any one of claims 1-5, characterized in that, The test platform also includes a rotary motor; The turning motor is connected to and drives the compressor.

7. The test platform according to any one of claims 2-5, characterized in that, The test platform also includes a twelfth valve; The twelfth valve is connected in series between the air compressor and the precooler, and is connected in parallel with the dryer.

8. The test platform according to any one of claims 1-5, characterized in that, The compressor includes a cryogenic centrifugal compressor.

9. The testing platform according to claim 5, characterized in that, The test platform also includes a first one-way shut-off valve, a second one-way shut-off valve, and a third one-way shut-off valve; The first one-way shut-off valve is connected in series between the expansion section and the seventh valve; The second one-way shut-off valve is connected in series between the compression section and the low-pressure buffer tank; The third one-way shut-off valve is connected in series between the compressor outlet and the second heat exchange section.

10. A test method for a test platform used to test compressors, characterized in that, The testing method uses the testing platform as described in claim 1 and includes the following steps: In closed-loop operation, the test platform is operated in closed-loop mode, and the working fluid flows sequentially through the first heat exchange section, the high-pressure buffer tank, the expansion section of the expansion recompressor, the compressor, the second heat exchange section, and the low-pressure buffer tank to test the compressor.

11. The test method according to claim 10, characterized in that, The test platform also includes an air compressor, a dryer, a precooler, a fifth valve, a seventh valve, a ninth valve, a second heat exchange section, a fourth valve, a reflux bypass, and an eleventh valve, and the air compressor, the dryer, the precooler, the first heat exchange section, the high-pressure buffer tank, the fifth valve, the expansion recompressor, the seventh valve, the compressor, the ninth valve, the second heat exchange section, the fourth valve, the reflux bypass, the low-pressure buffer tank, the eleventh valve, and the air compressor are connected in series. In the closed-loop operation step, the fifth valve, the seventh valve, the ninth valve, the fourth valve, and the eleventh valve are opened to allow the test platform to operate in the closed-loop mode and to test the compressor.

12. The test method according to claim 11, characterized in that, The test platform also includes a first valve, a second valve, a throttling expansion valve, a third valve, and a tenth valve, and the inlet of the test platform, the first valve, the air compressor, the dryer, the precooler, the first heat exchange section, the high-pressure buffer tank, the second valve, the throttling expansion valve, the third valve, the second heat exchange section, the fourth valve, the reflux bypass, the low-pressure buffer tank, the tenth valve, and the outlet of the test platform are connected in series. The testing method also includes open operation, the open operation steps of which include opening the first valve, the second valve, the throttling expansion valve, the third valve, the fourth valve and the tenth valve, and closing the fifth valve, the seventh valve, the ninth valve and the eleventh valve; The closed-loop operation step further includes closing the first valve, the second valve, the third valve, and the tenth valve.

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