Thermal performance test system for combined type air extractor

Abstract

The invention discloses a combined type air extractor thermal performance testing system, and relates to the technical field of combined type air extractor performance testing. The problem that an existing thermal performance testing system cannot combine the functions of a main air extractor and a steam seal air extractor into a combined air extractor to conduct thermal performance testing is solved. According to the combined air extractor, simultaneous operation of the main air extractor part sleeve and the steam seal air extractor part sleeve can be met, thermal performance parameters of the combined air extractor under different working conditions can be truly obtained, and meanwhile the characteristics of vibration noise during operation of the combined air extractor are obtained; the influence rule of the thermal performance of the main air extractor can be analyzed through system parameters such as the working steam pressure and temperature, the cooling water flow and the inlet temperature. The combined type air extractor is suitable for combining the functions of a main air extractor and a steam seal air extractor into a combined type air extractor to carry out a thermal performance test.

Description

Technical Field

[0001] The invention relates to the technical field of combined vacuum pump performance testing, and in particular to a combined vacuum pump thermal performance testing system. Background Art

[0002] The vacuum pump is one of the key equipment of the main steam turbine unit: the main vacuum pump continuously extracts the air and non-condensable gas in the steam in the condenser, thereby maintaining a high vacuum state inside the condenser to ensure the working efficiency of the condenser and the safe operation of the entire unit; the steam seal vacuum pump forms a certain negative pressure in the shaft seal chamber of the steam turbine to extract the shaft seal return steam to prevent the shaft seal steam from leaking out. The combined vacuum pump prototype adopts a steam injection fresh water cooling solution. The equipment takes into account the functions of the main vacuum pump and the steam seal vacuum pump. The overall equipment adopts a three-stage steam ejector and an integrated surface cooling structure. The three sets of vacuum pumps are all built into the cooler, and the cooler adopts an integrated design structure. The combined vacuum pump is mainly composed of a cooler, an upper pipe box, a lower pipe box, and a steam chamber. The thermal performance of the combined vacuum pump will determine the operating status of the steam turbine unit.

[0003] At present, it is a rare innovation in China to combine the functions of the main vacuum pump and the steam seal vacuum pump into a combined vacuum pump. The test system for this new vacuum pump must take into account the different operating requirements of the main vacuum pump and the steam seal vacuum pump. At present, there is no corresponding test facility in China to conduct thermal performance tests on combined vacuum pumps. Summary of the invention

[0004] The present invention proposes a combined vacuum pump thermal performance test system to solve the problem that the existing thermal performance test system cannot combine the functions of the main vacuum pump and the steam seal vacuum pump into a combined vacuum pump for thermal performance testing.

[0005] A combined vacuum pump thermal performance test system of the present invention comprises a condenser simulation unit 1, a combined vacuum pump test piece 2, a No. 1 stop valve 3, a No. 2 stop valve 4, a No. 3 stop valve 5, a shaft seal system steam simulation unit 6, a steam trap 7, a circulation drive unit 8, a No. 1 regulating valve 9, a No. 4 stop valve 10, a condenser unit 11 and a No. 5 stop valve 12;

[0006] The top output end of the condenser simulation unit 1 is connected to the input end of the III-stage steam-gas mixture pipeline of the combined vacuum pump test piece 2 through a pipeline, the input end of the I-stage steam-gas mixture pipeline of the combined vacuum pump test piece 2 is connected to the top output end of the shaft sealing system steam simulation unit 6 through a pipeline, the bottom output end of the shaft sealing system steam simulation unit 6 is connected to the input end of the condenser unit 11 through a pipeline, the No. 1 output end of the condenser unit 11 is connected to the No. 1 input end of the circulation drive unit 8 through the No. 1 regulating valve 9, the No. 2 output end of the condenser unit 11 is connected to the No. 2 input end of the circulation drive unit 8 through the No. 4 stop valve 10, the input end of the condenser unit 11 is connected to the bottom output end of the condenser simulation unit 1 through a pipeline, the top input end of the condenser simulation unit 1, the output end of the III-stage steam-gas mixture pipeline of the combined vacuum pump test piece 2 and the combined vacuum pump A No. 5 stop valve 12 is respectively arranged at the input end of the steam-gas mixture pipeline of the first stage of the combined vacuum pump test piece 2, and the connection between the top input end of the condenser simulation unit 1 and the No. 5 stop valve 12 is connected to the top input end of the shaft seal system steam simulation unit 6 through a pipeline. The steam-gas mixture pipelines of the first and second stages of the combined vacuum pump test piece 2 are connected in parallel through a pipeline, and are then connected in series with the No. 2 stop valve 4 through a pipeline. A No. 1 stop valve 3 is arranged at the top of the steam-gas mixture pipeline of the IV stage of the combined vacuum pump test piece 2, and the No. 1 stop valve 3 and the No. 2 stop valve 4 are connected in parallel through a pipeline, and are then connected to the bottom end of the No. 3 stop valve 5 through a pipeline. The top end of the No. 3 stop valve 5 is connected to the No. 5 stop valve 12 at the top input end of the condenser simulation unit 1 through a pipeline, and the bottom output end of the steam-gas mixture pipeline of each stage of the combined vacuum pump test piece 2 is connected to the corresponding input end of the condenser unit 11 through a steam trap 7;

[0007] Furthermore, the condenser simulation unit 1 includes a condensation stop valve 1-1, a No. 1 condensation regulating valve 1-2, a No. 2 condensation regulating valve 1-3, a No. 3 condensation regulating valve 1-4 and a condensation simulation tank 1-5;

[0008] A No. 1 condensation regulating valve 1-2 is provided on the No. 1 input end of the condensation simulation tank 1-5, a No. 2 input end of the condensation simulation tank 1-5 is connected to one end of the No. 2 condensation regulating valve 1-3, a No. 1 steam seal vacuum pump part set suction air flow meter S05 is provided on the other end of the No. 2 condensation regulating valve 1-3, a No. 3 input end of the condensation simulation tank 1-5 is connected to one end of the No. 3 condensation regulating valve 1-4, a No. 2 steam seal vacuum pump part set suction steam flow meter S06 is provided on the other end of the No. 3 condensation regulating valve 1-4, a No. 1 condensation stop valve 1-1 is provided on the No. 1 output end of the condensation simulation tank 1-5;

[0009] Further, the shaft sealing system steam simulation unit 6 includes a No. 1 steam stop valve 6-1, a steam simulation tank 6-2, a No. 1 steam regulating valve 6-3, a No. 2 steam regulating valve 6-4, a No. 3 steam regulating valve 6-5 and a No. 2 steam stop valve 6-6;

[0010] A No. 1 steam stop valve 6-1 is provided at the No. 1 output end of the steam simulation tank 6-2, a No. 2 steam stop valve 6-6 is provided at the No. 2 output end of the steam simulation tank 6-2, a No. 1 steam regulating valve 6-3 is provided at the No. 1 input end of the steam simulation tank 6-2, the No. 2 input end of the steam simulation tank 6-2 is connected to one end of the No. 2 steam regulating valve 6-4, the other end of the No. 2 steam regulating valve 6-4 is provided with a No. 2 main vacuum pump part set suction steam flow meter S04, the No. 3 input end of the steam simulation tank 6-2 is connected to one end of the No. 3 steam regulating valve 6-5, the other end of the No. 3 steam regulating valve 6-5 is provided with a No. 1 main vacuum pump part set suction air flow meter S03;

[0011] Furthermore, the circulation drive unit 8 includes a condensate pump 8-1, a vacuum pump 8-2, a circulation stop valve 8-3 and a check valve 8-4;

[0012] A check valve 8-4 is provided at the output end of the condensate pump 8-1, and the input end of the condensate pump 8-1 is connected to the output end of the No. 4 stop valve 10. A circulation stop valve 8-3 is provided at the output end of the vacuum pump 8-2, and the input end of the vacuum pump 8-2 is connected to the output end of the No. 1 regulating valve 9.

[0013] Furthermore, the condenser unit 11 includes a condenser 11-1 and a condensate stop valve 11-2, and a condensate stop valve 11-2 is provided at the input end and the output end of the condenser 11-1 respectively;

[0014] Furthermore, a test piece cooling water inlet thermometer T03 and a test piece cooling water flowmeter S02 are provided in sequence on the pipe connecting the input end of the steam-gas mixture pipeline of the first stage of the combined vacuum pump test piece 2 and the No. 5 stop valve 12; a test piece cooling water outlet thermometer T04 is provided on the pipe connecting the input end of the steam-gas mixture pipeline of the third stage of the combined vacuum pump test piece 2 and the No. 5 stop valve 12;

[0015] Furthermore, the pipe connecting the top output end of the condenser simulation unit 1 and the input end of the III-stage steam-gas mixture pipeline of the combined vacuum extractor test piece 2 is provided with a test piece working steam thermometer T02 and a shaft seal system steam-gas mixture pressure gauge P03 in sequence;

[0016] Furthermore, the pipeline connected to the bottom end of the No. 3 stop valve 5 at the parallel connection point of the No. 1 stop valve 3 and the No. 2 stop valve 4 is provided with a test piece working steam total flow meter S01 and a test piece working steam temperature meter T02 from top to bottom;

[0017] Furthermore, the pipeline connecting the input end of the steam-gas mixture pipeline of the first stage of the combined vacuum extractor test piece 2 and the top output end of the shaft seal system steam simulation unit 6 is provided with a condenser steam-gas mixture pressure gauge P01 and a condenser steam-gas mixture thermometer T01 in sequence;

[0018] Furthermore, a main vacuum pump part sleeve exhaust thermometer T05 is provided on the middle output end of the steam-gas mixture pipeline of the second stage of the combined vacuum pump test piece 2; a steam seal vacuum pump part sleeve exhaust thermometer T06 is provided on the middle output end of the steam-gas mixture pipeline of the fourth stage of the combined vacuum pump test piece 2; the middle output end of the steam-gas mixture pipeline of the first stage of the combined vacuum pump test piece 2 and the middle output end of the steam-gas mixture pipeline of the third stage of the combined vacuum pump test piece 2 are connected in series through a pipeline, and the series pipeline is provided with a test piece cooling water inlet and outlet pressure gauge P02.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention overcomes the shortcomings of the prior art. The high-temperature and high-pressure steam generated by the boiler is cooled and reduced in pressure before entering the test system and being distributed to various steam-using equipment in the system through a regulating valve for use as heating steam or working steam. After the working steam enters the combined vacuum pump and passes through the nozzle, its pressure is reduced and the thermal energy is converted into kinetic energy. The high-speed flowing steam forms a vacuum in the mixing chamber, and the steam-gas mixture in the main condenser and the shaft sealing system is extracted, thereby maintaining the back pressure of the unit and the shaft sealing system.

[0021] In the test system, the condenser simulation unit is used to replace the main condenser to generate a steam-gas mixture at the condenser exhaust port. The steam simulation tank is used to replace the shaft seal system to generate a steam-gas mixture that simulates the shaft seal system and valve stem leakage. The heated steam enters the simulation device or simulation tank and then heats the desalted water to generate saturated steam. The saturated steam is mixed with the air that enters the simulation device or simulation tank through the pipeline and is sucked by the equipment. The working steam and the steam-gas mixture are fully mixed in the diffusion tube and then enter the cooler of the combined vacuum pump test piece. In the cooler, surface heat exchange occurs with the cooling water. Most of the steam is condensed, and the condensed water is discharged into the system condenser through the steam trap. A very small amount of uncondensed steam and air are discharged into the atmosphere through the check valve or the exhaust port. In the test, the cooling water of the combined vacuum pump is pumped out from the water mixer by the circulating water pump. There are two water inlets in the water mixer, one is return water, and the other is public system circulating water. The water inlet of the two water inlets is controlled by the regulating valve. After mixing to reach the required temperature of the test, it is injected into the test equipment as cooling water.

[0022] The present invention can meet the simultaneous operation of the main vacuum pump sleeve and the steam seal vacuum pump sleeve, can truly obtain the thermal performance parameters of the combined vacuum pump under different working conditions, and simultaneously obtain the characteristics of the vibration and noise of the combined vacuum pump during operation; and can analyze the influence of system parameters such as working steam pressure and temperature, cooling water flow and inlet temperature on the thermal performance of the main vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a combined vacuum pump thermal performance test system described in the present invention. DETAILED DESCRIPTION

[0024] Specific implementation method 1: Combination Figure 1 The present embodiment is described. The thermal performance test system of a combined vacuum extractor described in the present embodiment comprises a condenser simulation unit 1, a combined vacuum extractor test piece 2, a No. 1 stop valve 3, a No. 2 stop valve 4, a No. 3 stop valve 5, a shaft seal system steam simulation unit 6, a steam trap 7, a circulation drive unit 8, a No. 1 regulating valve 9, a No. 4 stop valve 10, a condenser unit 11 and a No. 5 stop valve 12;

[0025] The top output end of the condenser simulation unit 1 is connected to the input end of the III-stage steam-gas mixture pipeline of the combined vacuum pump test piece 2 through a pipeline, the input end of the I-stage steam-gas mixture pipeline of the combined vacuum pump test piece 2 is connected to the top output end of the shaft sealing system steam simulation unit 6 through a pipeline, the bottom output end of the shaft sealing system steam simulation unit 6 is connected to the input end of the condenser unit 11 through a pipeline, the No. 1 output end of the condenser unit 11 is connected to the No. 1 input end of the circulation drive unit 8 through the No. 1 regulating valve 9, the No. 2 output end of the condenser unit 11 is connected to the No. 2 input end of the circulation drive unit 8 through the No. 4 stop valve 10, the input end of the condenser unit 11 is connected to the bottom output end of the condenser simulation unit 1 through a pipeline, the top input end of the condenser simulation unit 1, the output end of the III-stage steam-gas mixture pipeline of the combined vacuum pump test piece 2 and the combined vacuum pump A No. 5 stop valve 12 is respectively arranged at the input end of the steam-gas mixture pipeline of the first stage of the combined vacuum pump test piece 2, and the connection between the top input end of the condenser simulation unit 1 and the No. 5 stop valve 12 is connected to the top input end of the shaft seal system steam simulation unit 6 through a pipeline. The steam-gas mixture pipelines of the first and second stages of the combined vacuum pump test piece 2 are connected in parallel through a pipeline, and are then connected in series with the No. 2 stop valve 4 through a pipeline. A No. 1 stop valve 3 is arranged at the top of the steam-gas mixture pipeline of the IV stage of the combined vacuum pump test piece 2, and the No. 1 stop valve 3 and the No. 2 stop valve 4 are connected in parallel through a pipeline, and are then connected to the bottom end of the No. 3 stop valve 5 through a pipeline. The top end of the No. 3 stop valve 5 is connected to the No. 5 stop valve 12 at the top input end of the condenser simulation unit 1 through a pipeline, and the bottom output end of the steam-gas mixture pipeline of each stage of the combined vacuum pump test piece 2 is connected to the corresponding input end of the condenser unit 11 through a steam trap 7;

[0026] In this specific embodiment, the thermal performance test system of the combined vacuum pump of the present invention has built an effective thermal performance system and test bench for the combined vacuum pump, which is mainly used for the thermal performance test of the combined vacuum pump. The test system can study the thermal performance of the combined vacuum pump under different working conditions, carry out preliminary research on the overall performance of the combined vacuum pump, break through the technical bottlenecks such as the joint operation of the main vacuum pump sleeve and the steam seal vacuum pump sleeve, and provide technical support for the design of the combined vacuum pump.

[0027] The thermal performance test system of the combined vacuum pump provided by the present invention is used to conduct tests, including thermal performance tests under design point conditions and thermal performance tests under low parameter conditions, specifically:

[0028] 1. Thermal test at design point conditions:

[0029] 1 Before the test, check and confirm that all systems have been powered on and are working normally, and the test and operating personnel are ready at their respective positions;

[0030] 2 Adjust the working steam pressure, cooling water flow, cooling water inlet and other parameters, and record the relevant data. Draw a curve of the vacuum change of the condensation simulation device and the steam simulation tank with the amount of steam extracted.

[0031] 3 When testing the main vacuum pump part, fully open the working steam inlet valve of the main vacuum pump part. After the pressure of the condensation simulation device is stable, gradually increase the heating steam flow of the condensation simulation device to increase the steam production of the condensation simulation device. When the pressure of the condensation simulation device rises to the design point, stop the test.

[0032] 4 When testing the steam seal vacuum pump part, fully open the working steam inlet valve of the steam seal vacuum pump part. After the pressure in the steam simulation tank is stable, gradually increase the heating steam flow rate of the steam simulation tank to increase the steam production of the steam simulation tank. When the pressure in the steam simulation tank rises to the design point, stop the test.

[0033] 2. Thermal performance test under low parameter conditions (single unit test):

[0034] 1 Before the test, check and confirm that all systems have been powered on and are working normally, and the test and operating personnel are ready at their respective positions;

[0035] 2 Adjust the working steam pressure, cooling water flow, cooling water inlet temperature and other parameters, and record the relevant data. Draw a curve of the vacuum change of the condensation simulation device and the steam simulation tank with the amount of steam extracted.

[0036] 3 When testing the main vacuum pump part, fully open the working steam inlet valve of the main vacuum pump part. After the pressure of the condensation simulation device is stable, if the pressure value is higher than the design point, the test will be stopped directly. If the pressure value is lower than the design point, gradually increase the heating steam flow rate of the condensation simulation device to increase the steam production of the condensation simulation device. When the pressure of the condensation simulation device rises to the design point, the test will be stopped.

[0037] 4. When testing the steam seal vacuum pump, fully open the steam inlet valve of the steam seal vacuum pump. After the pressure of the steam simulation tank is stable, gradually increase the flow rate of the steam simulation tank heating steam to increase the steam output of the steam simulation tank. When the pressure of the steam simulation tank rises to the design point, stop the test. During the test, the pressure of the working steam can be adjusted, and the pressure and flow rate of the cooling water can also be adjusted.

[0038] Specific implementation method 2: Combination Figure 1 This embodiment is described. This embodiment is a further limitation of the test system described in the specific embodiment 1. This embodiment is a combined type vacuum pump thermal performance test system. The condenser simulation unit 1 includes a condensation stop valve 1-1, a No. 1 condensation regulating valve 1-2, a No. 2 condensation regulating valve 1-3, a No. 3 condensation regulating valve 1-4 and a condensation simulation tank 1-5.

[0039] A No. 1 condensation regulating valve 1-2 is provided on the No. 1 input end of the condensation simulation tank 1-5, the No. 2 input end of the condensation simulation tank 1-5 is connected to one end of the No. 2 condensation regulating valve 1-3, the other end of the No. 2 condensation regulating valve 1-3 is provided with a No. 1 steam seal vacuum pump part set suction air flow meter S05, the No. 3 input end of the condensation simulation tank 1-5 is connected to one end of the No. 3 condensation regulating valve 1-4, the other end of the No. 3 condensation regulating valve 1-4 is provided with a No. 2 steam seal vacuum pump part set suction steam flow meter S06, and the No. 1 output end of the condensation simulation tank 1-5 is provided with a condensation stop valve 1-1.

[0040] Specific implementation method three: Combination Figure 1 This embodiment is described. This embodiment is a further limitation of the test system described in the second embodiment. In this embodiment, a combined vacuum pump thermal performance test system is described. The shaft seal system steam simulation unit 6 includes a No. 1 steam stop valve 6-1, a steam simulation tank 6-2, a No. 1 steam regulating valve 6-3, a No. 2 steam regulating valve 6-4, a No. 3 steam regulating valve 6-5 and a No. 2 steam stop valve 6-6;

[0041] The No. 1 output end of the steam simulation tank 6-2 is provided with a No. 1 steam stop valve 6-1, the No. 2 output end of the steam simulation tank 6-2 is provided with a No. 2 steam stop valve 6-6, the No. 1 input end of the steam simulation tank 6-2 is provided with a No. 1 steam regulating valve 6-3, the No. 2 input end of the steam simulation tank 6-2 is connected to one end of the No. 2 steam regulating valve 6-4, the other end of the No. 2 steam regulating valve 6-4 is provided with a No. 2 main vacuum pump part set suction steam flow meter S04, the No. 3 input end of the steam simulation tank 6-2 is connected to one end of the No. 3 steam regulating valve 6-5, the other end of the No. 3 steam regulating valve 6-5 is provided with a No. 1 main vacuum pump part set suction air flow meter S03.

[0042] Specific implementation method four: Combination Figure 1 This embodiment is described. This embodiment is a further limitation of the test system described in the third embodiment. In this embodiment, a combined vacuum pump thermal performance test system is described. The circulation drive unit 8 includes a condensate pump 8-1, a vacuum pump 8-2, a circulation stop valve 8-3 and a check valve 8-4.

[0043] A check valve 8-4 is provided at the output end of the condensate pump 8-1, and the input end of the condensate pump 8-1 is connected to the output end of the No. 4 stop valve 10. A circulation stop valve 8-3 is provided at the output end of the vacuum pump 8-2, and the input end of the vacuum pump 8-2 is connected to the output end of the No. 1 regulating valve 9.

[0044] Specific implementation method five: Combination Figure 1The present embodiment is described as a further limitation of the test system described in the fourth specific embodiment. The present embodiment describes a combined vacuum pump thermal performance test system, wherein the condenser unit 11 comprises a condenser 11-1 and a condensate shut-off valve 11-2. A condensate shut-off valve 11-2 is provided at the input end and the output end of the condenser 11-1, respectively.

[0045] Specific implementation method six: Combination Figure 1 The present embodiment is described. The present embodiment is a further limitation on the test system described in the first specific embodiment. The present embodiment describes a combined vacuum pump thermal performance test system. The input end of the steam-gas mixture pipeline of the first stage of the combined vacuum pump test piece 2 and the pipeline connected to the No. 5 stop valve 12 are provided with a test piece cooling water inlet thermometer T03 and a test piece cooling water flowmeter S02 in sequence; the input end of the steam-gas mixture pipeline of the third stage of the combined vacuum pump test piece 2 and the pipeline connected to the No. 5 stop valve 12 are provided with a test piece cooling water outlet thermometer T04.

[0046] Specific implementation method seven: Combination Figure 1 To explain this embodiment, this embodiment is a further limitation of the test system described in the specific embodiment one. This embodiment describes a combined vacuum pump thermal performance test system, in which a pipe connecting the top output end of the condenser simulation unit 1 and the input end of the third-level vapor-gas mixture pipeline of the combined vacuum pump test piece 2 is provided with a shaft sealing system vapor-gas mixture thermometer T07 and a shaft sealing system vapor-gas mixture pressure gauge P03 in sequence.

[0047] Specific implementation method eight: Combination Figure 1 The present embodiment is described as a further limitation of the test system described in the first specific embodiment. The present embodiment describes a combined vacuum pump thermal performance test system, in which a total flow meter S01 of the working steam of the test piece and a working steam thermometer T02 of the test piece are arranged in sequence from top to bottom on the pipeline connected to the bottom end of the No. 3 stop valve 5 at the parallel connection point of the No. 1 stop valve 3 and the No. 2 stop valve 4.

[0048] Specific implementation method nine: Combination Figure 1 To explain this embodiment, this embodiment is a further limitation of the test system described in the specific embodiment 1. This embodiment describes a combined vacuum pump thermal performance test system, in which a condenser vapor-gas mixture pressure gauge P01 and a condenser vapor-gas mixture thermometer T01 are provided in sequence on the pipeline connecting the input end of the first-stage vapor-gas mixture pipeline of the combined vacuum pump test piece 2 and the top output end of the steam simulation unit 6 of the shaft sealing system.

[0049] Specific implementation method ten: Combination Figure 1The present embodiment is described. The present embodiment is a further limitation on the test system described in the first embodiment. The present embodiment describes a combined vacuum pump thermal performance test system. A main vacuum pump part sleeve exhaust thermometer T05 is provided on the middle output end of the steam-gas mixture pipeline of the second stage of the combined vacuum pump test piece 2; a steam seal vacuum pump part sleeve exhaust thermometer T06 is provided on the middle output end of the steam-gas mixture pipeline of the fourth stage of the combined vacuum pump test piece 2; the middle output end of the steam-gas mixture pipeline of the first stage of the combined vacuum pump test piece 2 and the middle output end of the steam-gas mixture pipeline of the third stage of the combined vacuum pump test piece 2 are connected in series through a pipeline, and the series pipeline is provided with a test piece cooling water inlet and outlet pressure gauge P02.

[0050] How it works

[0051] When in use, the high-temperature and high-pressure steam generated by the boiler enters the test system after being cooled and reduced in pressure, and is distributed to various steam-using equipment in the system through regulating valves for use as heating steam or working steam. After the working steam enters the combined vacuum pump and passes through the nozzle, the pressure is reduced, and the thermal energy is converted into kinetic energy. The high-speed flowing steam forms a vacuum in the mixing chamber, and the steam-gas mixture in the main condenser and the shaft sealing system is extracted, thereby maintaining the back pressure of the unit and the shaft sealing system.

[0052] In the test system, the condenser simulation unit is used to replace the main condenser to generate a steam-gas mixture at the condenser exhaust port. The steam simulation tank is used to replace the shaft seal system to generate a steam-gas mixture that simulates the shaft seal system and valve stem leakage. The heated steam enters the simulation device or simulation tank and then heats the desalted water to generate saturated steam. The saturated steam is mixed with the air that enters the simulation device or simulation tank through the pipeline and is sucked by the equipment. The working steam and the steam-gas mixture are fully mixed in the diffusion tube and then enter the cooler of the combined vacuum pump test piece. In the cooler, surface heat exchange occurs with the cooling water. Most of the steam is condensed, and the condensed water is discharged into the system condenser through the steam trap. A very small amount of uncondensed steam and air are discharged into the atmosphere through the check valve or the exhaust port. In the test, the cooling water of the combined vacuum pump is pumped out from the water mixer by the circulating water pump. There are two water inlets in the water mixer, one is return water, and the other is public system circulating water. The water inlet of the two water inlets is controlled by the regulating valve. After mixing to reach the required temperature of the test, it is injected into the test equipment as cooling water.

Claims

1. A combined vacuum pump thermal performance test system, characterized in that: It comprises a condenser simulation unit (1), a combined vacuum pump test piece (2), a No. 1 stop valve (3), a No. 2 stop valve (4), a No. 3 stop valve (5), a shaft seal system steam simulation unit (6), a steam trap (7), a circulation drive unit (8), a No. 1 regulating valve (9), a No. 4 stop valve (10), a condenser unit (11) and a No. 5 stop valve (12); The top output end of the condenser simulation unit (1) is connected to the input end of the third-stage steam-gas mixture pipeline of the combined vacuum pump test piece (2) through a pipeline, the input end of the first-stage steam-gas mixture pipeline of the combined vacuum pump test piece (2) is connected to the top output end of the shaft seal system steam simulation unit (6) through a pipeline, the bottom output end of the shaft seal system steam simulation unit (6) is connected to the input end of the condenser unit (11) through a pipeline, the No. 1 output end of the condenser unit (11) is connected to the No. 1 input end of the circulation drive unit (8) through a No. 1 regulating valve (9), the No. 2 output end of the condenser unit (11) is connected to the No. 2 input end of the circulation drive unit (8) through a No. 4 stop valve (10), the input end of the condenser unit (11) is connected to the bottom output end of the condenser simulation unit (1) through a pipeline, the top input end of the condenser simulation unit (1), the output end of the third-stage steam-gas mixture pipeline of the combined vacuum pump test piece (2) and the combined vacuum pump test piece (2) are connected to the No. 1 input end of the condenser unit (11). The input end of the steam-gas mixture pipeline of the first stage of the test piece (2) is respectively provided with a No. 5 stop valve (12), the connection between the top input end of the condenser simulation unit (1) and the No. 5 stop valve (12) is connected to the top input end of the shaft seal system steam simulation unit (6) through a pipeline, the steam-gas mixture pipelines of the first stage and the second stage of the combined vacuum pump test piece (2) are connected in parallel through a pipeline, and are further connected in series with the No. 2 stop valve (4) through a pipeline, and the IV stage of the combined vacuum pump test piece (2) is connected in parallel with the No. 5 stop valve (12). A No. 1 stop valve (3) is provided at the top of the steam-gas mixture pipeline. The No. 1 stop valve (3) and the No. 2 stop valve (4) are connected in parallel through a pipeline and are further connected to the bottom end of the No. 3 stop valve (5) through a pipeline. The top end of the No. 3 stop valve (5) is connected to the No. 5 stop valve (12) at the top input end of the condenser simulation unit (1) through a pipeline. The bottom output end of the steam-gas mixture pipeline of each stage of the combined vacuum pump test piece (2) is connected to the corresponding input end of the condenser unit (11) through a steam trap (7).

2. A combined vacuum extractor thermal performance test system according to claim 1, characterized in that: The condenser simulation unit (1) comprises a condensation stop valve (1-1), a No. 1 condensation regulating valve (1-2), a No. 2 condensation regulating valve (1-3), a No. 3 condensation regulating valve (1-4) and a condensation simulation tank (1-5); A No. 1 condensation regulating valve (1-2) is provided on the No. 1 input end of the condensation simulation tank (1-5), the No. 2 input end of the condensation simulation tank (1-5) is connected to one end of the No. 2 condensation regulating valve (1-3), the other end of the No. 2 condensation regulating valve (1-3) is provided with a No. 1 steam seal vacuum pump part set suction air flow meter (S05), the No. 3 input end of the condensation simulation tank (1-5) is connected to one end of the No. 3 condensation regulating valve (1-4), the other end of the No. 3 condensation regulating valve (1-4) is provided with a No. 2 steam seal vacuum pump part set suction steam flow meter (S06), and the No. 1 output end of the condensation simulation tank (1-5) is provided with a condensation stop valve (1-1).

3. A combined vacuum extractor thermal performance test system according to claim 2, characterized in that: The shaft sealing system steam simulation unit (6) comprises a No. 1 steam stop valve (6-1), a steam simulation tank (6-2), a No. 1 steam regulating valve (6-3), a No. 2 steam regulating valve (6-4), a No. 3 steam regulating valve (6-5) and a No. 2 steam stop valve (6-6); A No. 1 steam stop valve (6-1) is provided at the No. 1 output end of the steam simulation tank (6-2), a No. 2 steam stop valve (6-6) is provided at the No. 2 output end of the steam simulation tank (6-2), a No. 1 steam regulating valve (6-3) is provided at the No. 1 input end of the steam simulation tank (6-2), the No. 2 input end of the steam simulation tank (6-2) is connected to one end of the No. 2 steam regulating valve (6-4), the other end of the No. 2 steam regulating valve (6-4) is provided with a No. 2 main vacuum pump part set suction steam flow meter (S04), the No. 3 input end of the steam simulation tank (6-2) is connected to one end of the No. 3 steam regulating valve (6-5), the other end of the No. 3 steam regulating valve (6-5) is provided with a No. 1 main vacuum pump part set suction air flow meter (S03).

4. A combined vacuum extractor thermal performance test system according to claim 3, characterized in that: The circulation drive unit (8) comprises a condensate pump (8-1), a vacuum pump (8-2), a circulation stop valve (8-3) and a check valve (8-4); A check valve (8-4) is provided at the output end of the condensate pump (8-1), the input end of the condensate pump (8-1) is connected to the output end of the fourth stop valve (10), a circulation stop valve (8-3) is provided at the output end of the vacuum pump (8-2), and the input end of the vacuum pump (8-2) is connected to the output end of the first regulating valve (9).

5. A combined vacuum extractor thermal performance test system according to claim 4, characterized in that: The condenser unit (11) comprises a condenser (11-1) and a condensate stop valve (11-2), and a condensate stop valve (11-2) is provided at the input end and the output end of the condenser (11-1), respectively.

6. A combined vacuum extractor thermal performance test system according to claim 1, characterized in that: A test piece cooling water inlet thermometer (T03) and a test piece cooling water flowmeter (S02) are provided in sequence on the pipeline connecting the input end of the steam-gas mixture pipeline of the first stage of the combined vacuum pump test piece (2) and the No. 5 stop valve (12); a test piece cooling water outlet thermometer (T04) is provided on the pipeline connecting the input end of the steam-gas mixture pipeline of the third stage of the combined vacuum pump test piece (2) and the No. 5 stop valve (12).

7. A combined vacuum extractor thermal performance test system according to claim 1, characterized in that: A shaft sealing system steam-gas mixture temperature meter (T07) and a shaft sealing system steam-gas mixture pressure gauge (P03) are provided in sequence on the pipeline connecting the top output end of the condenser simulation unit (1) and the input end of the third-level steam-gas mixture pipeline of the combined vacuum extractor test piece (2).

8. A combined vacuum extractor thermal performance test system according to claim 1, characterized in that: A test piece working steam total flow meter (S01) and a test piece working steam thermometer (T02) are arranged in sequence from top to bottom on the pipeline connected to the bottom end of the No. 3 stop valve (5) at the parallel connection point of the No. 1 stop valve (3) and the No. 2 stop valve (4).

9. A combined vacuum extractor thermal performance test system according to claim 1, characterized in that: A condenser steam-gas mixture pressure gauge (P01) and a condenser steam-gas mixture thermometer (T01) are provided in sequence on the pipeline connecting the input end of the steam-gas mixture pipeline of the first stage of the combined vacuum extractor test piece (2) and the top output end of the shaft seal system steam simulation unit (6).

10. A combined vacuum extractor thermal performance test system according to claim 1, characterized in that: A main vacuum pump part sleeve exhaust temperature gauge (T05) is provided on the middle output end of the steam-gas mixture pipeline of the second stage of the combined vacuum pump test piece (2); a steam seal vacuum pump part sleeve exhaust temperature gauge (T06) is provided on the middle output end of the steam-gas mixture pipeline of the fourth stage of the combined vacuum pump test piece (2); the middle output end of the steam-gas mixture pipeline of the first stage of the combined vacuum pump test piece (2) and the middle output end of the steam-gas mixture pipeline of the third stage of the combined vacuum pump test piece (2) are connected in series through a pipeline, and the series pipeline is provided with a test piece cooling water inlet and outlet pressure gauge (P02).

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