A combined vacuum pump thermal performance test system

Abstract

A combined vacuum pump thermal performance test system relates to the technical field of combined vacuum pump performance testing. It is designed 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 one to perform thermal performance testing on the combined vacuum pump. The present invention can meet the simultaneous operation of the main vacuum pump part and the steam seal vacuum pump part, can truly obtain the thermal performance parameters of the combined vacuum pump under different working conditions, and at the same time obtain the vibration and noise characteristics of the combined vacuum pump during operation; 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. The present invention is suitable for conducting thermal performance testing on a combined vacuum pump that is combined with the functions of the main vacuum pump and the steam seal vacuum pump.

Description

Technical Field

[0001] The present 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 extractor is a key component of the main steam turbine unit. The main vacuum extractor continuously extracts air and non-condensable gases from the steam within the condenser, maintaining a high vacuum inside the condenser to ensure efficient operation and safe operation of the entire unit. The steam seal vacuum extractor creates a negative pressure within the turbine's shaft seal chamber, extracting return steam from the seal to prevent leakage. The combined vacuum extractor prototype utilizes a steam-injected freshwater cooling solution, integrating the functions of both the main vacuum extractor and the steam seal vacuum extractor. The overall structure utilizes a three-stage steam ejector with integrated surface cooling. All three vacuum extractors are integrated within the cooler, which features an integrated design. The combined vacuum extractor primarily consists of the cooler, upper and lower tube boxes, and steam chamber. The thermal performance of the combined vacuum extractor will determine the operational performance of the steam turbine unit.

[0003] Combining the functions of the main and seal vacuum extractors into a single, modular vacuum extractor is a rare innovation in China. The test system for this new vacuum extractor must address the different operating requirements of both the main and seal vacuum extractors. Currently, there are no suitable test facilities in China to conduct thermal performance tests on modular vacuum extractors. Summary of the Invention

[0004] The present invention solves 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, and proposes a combined vacuum pump thermal performance test system.

[0005] A combined vacuum extractor thermal performance test system of the present invention 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;

[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 The input end of the steam-gas mixture pipeline of the first stage of the combined vacuum extractor test piece 2 is respectively provided with a No. 5 stop valve 12, 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 extractor test piece 2 are connected in parallel through pipelines, and then connected in series with the No. 2 stop valve 4 through a pipeline. The top of the steam-gas mixture pipeline of the IV stage of the combined vacuum extractor test piece 2 is provided with a No. 1 stop valve 3, the No. 1 stop valve 3 and the No. 2 stop valve 4 are connected in parallel through pipelines, and then connected to the bottom end of the No. 3 stop valve 5 through a pipeline. The top 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 extractor 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, the other end of the No. 2 condensation regulating valve 1-3 is provided with a No. 1 steam seal vacuum pump part set to suck air flow meter S05, 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, the other end of the No. 3 condensation regulating valve 1-4 is provided with a No. 2 steam seal vacuum pump part set to suck steam flow meter S06, and a No. 1 output end of the condensation simulation tank 1-5 is provided with a condensation stop valve 1-1;

[0009] Furthermore, 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] 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;

[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. The input end and the output end of the condenser 11-1 are each provided with a condensate stop valve 11-2.

[0014] Furthermore, a test piece cooling water inlet thermometer T03 and a test piece cooling water flowmeter S02 are sequentially provided on the pipe connecting the input end of the steam-gas mixture pipeline of the first stage of the combined vacuum extractor 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 extractor 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 temperature gauge T02 and a shaft seal system steam-gas mixture pressure gauge P03 in sequence;

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

[0017] Furthermore, a condenser steam-gas mixture pressure gauge P01 and a condenser steam-gas mixture thermometer T01 are sequentially provided 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;

[0018] Furthermore, a main vacuum pump part 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 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-consuming 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 its thermal energy is converted into kinetic energy. The high-speed flowing steam forms a vacuum in the mixing chamber, which removes the steam-gas mixture in the main condenser and the shaft sealing system, thereby maintaining the back pressure of the unit and the shaft sealing system.

[0021] In the test system, a condenser simulation unit replaces the main condenser to generate a steam-gas mixture simulating the condenser's exhaust port. A steam simulation tank replaces the shaft seal system to generate a steam-gas mixture simulating shaft seal system and valve stem leakage. Heated steam enters the simulation device or simulation tank, where it is heated and desalted to produce saturated steam. The saturated steam mixes with air entering the simulation device or simulation tank through a pipe and is then extracted by the equipment. The working steam and the steam-gas mixture are fully mixed in a diffuser before entering the cooler of the combined vacuum pump test piece. There, surface heat exchange occurs with cooling water, causing most of the steam to condense. The condensate is discharged through a steam trap into the system condenser, while a very small amount of uncondensed steam and air are discharged into the atmosphere through a check valve or exhaust port. During the test, cooling water for the combined vacuum pump is pumped from a water mixer by a circulating water pump. The mixer has two water inlets: one for return water and the other for circulating water from the public system. The water inflow from the two inlets is controlled by a regulating valve. After mixing to reach the required test temperature, the water is injected into the test equipment as cooling water.

[0022] The present invention can meet the simultaneous operation of the main vacuum pump cover and the steam seal vacuum pump cover, can truly obtain the thermal performance parameters of the combined vacuum pump under different working conditions, and at the same time obtain the vibration and noise characteristics 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 This embodiment is described. A combined vacuum extractor thermal performance test system according to this 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 The input end of the steam-gas mixture pipeline of the first stage of the combined vacuum extractor test piece 2 is respectively provided with a No. 5 stop valve 12, 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 extractor test piece 2 are connected in parallel through pipelines, and then connected in series with the No. 2 stop valve 4 through a pipeline. The top of the steam-gas mixture pipeline of the IV stage of the combined vacuum extractor test piece 2 is provided with a No. 1 stop valve 3, the No. 1 stop valve 3 and the No. 2 stop valve 4 are connected in parallel through pipelines, and then connected to the bottom end of the No. 3 stop valve 5 through a pipeline. The top 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 extractor test piece 2 is connected to the corresponding input end of the condenser unit 11 through a steam trap 7;

[0026] This specific embodiment of the present invention, a combined vacuum extractor thermal performance test system, provides an effective combined vacuum extractor thermal performance system and test bench, primarily used for combined vacuum extractor thermal performance testing. This test system can study the combined vacuum extractor's thermal performance under different operating conditions, conduct preliminary research on its overall performance, and overcome technical bottlenecks such as the coordinated operation of the main vacuum extractor housing and the steam seal vacuum extractor housing, providing technical support for the design of combined vacuum extractors.

[0027] The thermal performance test system of the combined vacuum extractor provided by the present invention is used to conduct tests, including thermal performance tests at design point conditions and thermal performance tests at 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 that the test and operating personnel are ready at their respective positions;

[0030] 2. Adjust parameters such as working steam pressure, cooling water flow, and cooling water inlet, and record relevant data. Draw a graph showing the change in vacuum of the condensation simulator and steam simulation tank versus the amount of extracted steam.

[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 that the test and operating personnel are ready at their respective positions;

[0035] 2. Adjust parameters such as working steam pressure, cooling water flow rate, and cooling water inlet temperature, and record relevant data. Draw a graph showing the change in vacuum of the condensation simulator and steam simulation tank versus the amount of extracted steam.

[0036] 3. When testing the main vacuum pump unit, fully open the working steam inlet valve of the main vacuum pump unit. 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 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 in the steam simulation tank stabilizes, gradually increase the flow rate of the heating steam in the steam simulation tank to increase the steam output of the steam simulation tank. When the pressure in the steam simulation tank reaches the design point, stop the test. During the test, the working steam pressure 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 further limits the test system described in the first embodiment. In this embodiment, a combined vacuum pump thermal performance test system is described. 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] The No. 1 input end of the condensation simulation tank 1-5 is provided with a No. 1 condensation regulating valve 1-2, 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 further limits 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, and 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, and 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 further defines the test system described in the third embodiment. In this embodiment, a combined vacuum pump thermal performance test system is described, wherein the circulation drive unit 8 includes a condensate pump 8-1, a vacuum pump 8-2, a circulation shut-off valve 8-3, and a check valve 8-4.

[0043] The output end of the condensate pump 8-1 is provided with a check valve 8-4, and the input end of the condensate pump 8-1 is connected to the output end of the No. 4 stop valve 10. The output end of the vacuum pump 8-2 is provided with a circulation stop valve 8-3, 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 1This embodiment is described as a further limitation of the test system described in the fourth embodiment. This embodiment describes a combined vacuum pump thermal performance test system, in which the condenser unit 11 includes a condenser 11-1 and a condensate shut-off valve 11-2. A condensate shut-off valve 11-2 is provided at the input and output ends of the condenser 11-1, respectively.

[0045] Specific implementation method six: combination Figure 1 This embodiment is described. This embodiment is a further limitation of the test system described in the first embodiment. This 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 This embodiment is described. This embodiment further limits the test system described in the specific embodiment 1. In this embodiment, a combined vacuum pump thermal performance test system is described. The pipe connecting the top output end of the condenser simulation unit 1 and the input end of the III-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 This embodiment is described as a further limitation of the test system described in the first embodiment. In this embodiment, a combined vacuum pump thermal performance test system is described, in which 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 thermometer T02 from top to bottom.

[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. In this embodiment, a combined vacuum pump thermal performance test system is described, and 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 top output end of the steam simulation unit 6 of the shaft seal system is provided with a condenser steam-gas mixture pressure gauge P01 and a condenser steam-gas mixture thermometer T01 in sequence.

[0049] Specific implementation method ten: Combination Figure 1This embodiment is described. This embodiment is a further limitation of the test system described in the first embodiment. This embodiment describes a combined vacuum pump thermal performance test system. The middle output end of the steam-gas mixture pipeline of the second stage of the combined vacuum pump test piece 2 is provided with a main vacuum pump part sleeve exhaust thermometer T05; the middle output end of the steam-gas mixture pipeline of the fourth stage of the combined vacuum pump test piece 2 is provided with a steam seal vacuum pump part sleeve exhaust thermometer T06; 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 is cooled and reduced in pressure before entering the test system. It is distributed to various steam-consuming equipment in the system through regulating valves and used 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, which removes the steam-gas mixture in the main condenser and the shaft sealing system, thereby maintaining the back pressure of the unit and the shaft sealing system.

[0052] In the test system, a condenser simulation unit replaces the main condenser to generate a steam-gas mixture simulating the condenser's exhaust port. A steam simulation tank replaces the shaft seal system to generate a steam-gas mixture simulating shaft seal system and valve stem leakage. Heated steam enters the simulation device or simulation tank, where it is heated and desalted to produce saturated steam. The saturated steam mixes with air entering the simulation device or simulation tank through a pipe and is then extracted by the equipment. The working steam and the steam-gas mixture are fully mixed in a diffuser before entering the cooler of the combined vacuum pump test piece. There, surface heat exchange occurs with cooling water, causing most of the steam to condense. The condensate is discharged through a steam trap into the system condenser, while a very small amount of uncondensed steam and air are discharged into the atmosphere through a check valve or exhaust port. During the test, cooling water for the combined vacuum pump is pumped from a water mixer by a circulating water pump. The mixer has two water inlets: one for return water and the other for circulating water from the public system. The water inflow from the two inlets is controlled by a regulating valve. After mixing to reach the required test temperature, the water is injected into the test equipment as cooling water.

Claims

1. A combined vacuum pump thermal performance test system, characterized by: It includes 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 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 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 III-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), 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 further connected in series with the No. 2 stop valve (4) through a pipeline. The fourth 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 pump 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 sleeve 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 sleeve 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 pump thermal performance test system according to claim 2, characterized in that: The shaft seal 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); 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).

4. A combined vacuum pump 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); The output end of the condensate pump (8-1) is provided with a check valve (8-4), the input end of the condensate pump (8-1) is connected to the output end of the No. 4 stop valve (10), the output end of the vacuum pump (8-2) is provided with a circulation stop valve (8-3), and the input end of the vacuum pump (8-2) is connected to the output end of the No. 1 regulating valve (9).

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

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

8. The combined vacuum pump 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 sequentially provided 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. The combined vacuum pump 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 sequentially provided 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. The combined vacuum pump 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).

Images