Testing equipment for low-temperature medium pump

Abstract

The invention belongs to the technical field of low-temperature cryogenic equipment testing, and discloses a low-temperature medium pump testing device which comprises an outer cylinder, a middle cylinder and an inner cylinder which are sequentially sleeved from outside to inside to form a vacuum layer and a jacket layer from outside to inside, and the outer cylinder is provided with a first liquid supplementing pipe communicated with the inner cylinder and a second liquid supplementing pipe communicated with the jacket layer. The second liquid supplementing pipe is provided with a flow dividing pipe communicated with the inner barrel, a coil pipe is arranged on the lower portion of the jacket layer, the coil pipe, the circulating liquid outlet pipe, the circulating liquid inlet pipe and the pump wheel assembly form a closed-loop circulating channel, the low-temperature medium pump is connected with the pump wheel assembly, and the outer barrel is further provided with a safety assembly, a jacket layer monitoring system and an inner barrel monitoring system. The vacuum layer is provided with a heat insulation sleeve which wraps the pipeline penetrating through the vacuum layer. Through the heat insulation design of the vacuum layer, the heat insulation sleeve and the jacket layer, a low-temperature medium almost runs in a vacuum environment, the cold loss can be effectively blocked, the loss of the low-temperature medium is greatly reduced, and the energy waste and the running cost are reduced.

Description

Technical Field

[0001] This invention belongs to the field of cryogenic equipment testing technology, specifically relating to a testing device for a cryogenic medium pump. Background Technology

[0002] Cryogenic pumps are critical equipment in cryogenic engineering, and their performance directly affects the operating efficiency and stability of the entire cryogenic system. Therefore, rigorous performance testing is required before delivery or after maintenance. Existing cryogenic pump testing equipment has several shortcomings: 1. During testing, there is significant heat exchange between the cryogenic medium and the external environment, leading to rapid medium loss and requiring continuous replenishment. In long-term testing scenarios, this results in extremely high operating costs. 2. Fluctuations in external temperature easily affect the state of the test medium, leading to significant deviations in test data and an inability to stably and accurately reflect the actual performance of the cryogenic pump. 3. The slow replenishment rate of the cryogenic medium makes it difficult to quickly meet the replenishment needs of medium loss during testing, affecting testing efficiency. 4. Existing testing equipment has weak vacuum environment maintenance capabilities, affecting insulation performance and further exacerbating energy waste and test environment instability. 5. Pressure fluctuations during testing can easily cause safety hazards, and there is a lack of comprehensive safety protection. 6. The connection and vacuum layer fit structure of existing testing equipment is unreasonable, resulting in severe heat leakage in the pipelines, further affecting the stability of the test environment and energy utilization efficiency.

[0003] Therefore, there is an urgent need for an energy-saving, stable, efficient, and safe testing device to obtain the performance parameters of cryogenic medium pumps. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing cryogenic medium pump testing equipment, such as serious energy waste, unstable testing environment, slow medium replenishment speed, weak vacuum maintenance capability, insufficient safety protection, and serious pipeline heat leakage, and to provide a cryogenic medium pump testing equipment with reasonable structure, energy efficiency, accurate testing, and safety and stability.

[0005] The objective of this invention is achieved through the following technical solution: A testing device for a cryogenic medium pump includes an outer cylinder, an intermediate cylinder, and an inner cylinder, sequentially arranged from the outside in, forming a vacuum layer and a jacket layer from the outside in. A vacuum nozzle communicating with the vacuum layer is installed on the outer cylinder. The outer cylinder has a first replenishment pipe and a second replenishment pipe. The first replenishment pipe communicates with the inner cylinder, and the second replenishment pipe communicates with the jacket layer. A diverter pipe is provided on the second replenishment pipe, communicating with the inner cylinder. An inner cylinder replenishment valve is installed on the diverter pipe. A coil is provided at the lower part of the jacket layer. The inlet end of the coil is connected to the inner cylinder, and the outlet end of the coil is sequentially connected to a Venturi flow meter, a flow meter lead pipe, a liquid outlet shut-off valve, and a circulating liquid outlet pipe. A circulating inlet pipe communicating with the inner cylinder is installed on the outer cylinder. The liquid pipe, the circulating liquid outlet pipe, and the circulating liquid inlet pipe are connected outside the vacuum layer. The upper part of the inner cylinder is equipped with a pump wheel assembly. The bottom of the pump wheel assembly is connected to a pump inlet pipe that extends into the bottom of the inner cylinder. The side wall of the pump wheel assembly is equipped with a pump outlet pipe that connects to the inlet end of the coil. The coil, the circulating liquid outlet pipe, the circulating liquid inlet pipe, and the pump wheel assembly form a closed-loop circulation channel. A cryogenic medium pump connected to the pump wheel assembly is installed in the middle of the top surface of the outer cylinder. The outer cylinder is also equipped with a safety component, a jacket layer monitoring system, and an inner cylinder monitoring system. The vacuum layer is equipped with an insulating sleeve that wraps the circulating liquid inlet pipe, the liquid outlet shut-off valve, the circulating liquid outlet pipe, the first liquid replenishment pipe, the second liquid replenishment pipe, the safety component, the jacket layer monitoring system, and the inner cylinder monitoring system.

[0006] The vacuum layer is equipped with a vacuum holding box, which is filled with non-metallic adsorbent material.

[0007] The non-metallic adsorbent material is a molecular sieve or activated carbon.

[0008] The safety component is connected to the upper part of the inner cylinder and includes an exhaust valve, a safety valve, and a pressure gauge for pressure monitoring and overpressure relief.

[0009] The jacket layer monitoring system monitors the temperature, pressure, flow rate, and velocity of the medium within the jacket layer and coil.

[0010] The inner cylinder monitoring system monitors the medium temperature, pressure, and liquid level parameters of the inner cylinder.

[0011] The vacuum layer, jacket layer, inner cylinder and insulation sleeve are all made of stainless steel, the inner cylinder is made of 316L stainless steel and the insulation sleeve is 3 mm thick.

[0012] The beneficial effects of the testing equipment for the cryogenic medium pump provided by this invention are: (1) Through the thermal insulation design of vacuum layer, insulation sleeve and jacket layer, the low temperature medium can operate in a vacuum environment, which can effectively block the loss of cold energy, greatly reduce the loss of low temperature medium, and reduce energy waste and operating costs. (2) The jacket layer provides a relatively stable and balanced low temperature environment for the entire equipment, further reducing the impact of external temperature fluctuations on the state of the test medium and improving the accuracy of the test. (3) The first and second replenishment pipelines adopt a dual-complementary design, which can quickly replenish the low-temperature medium in the inner cylinder, greatly saving the injection time of the medium, and providing a strong guarantee for the continuous and stable operation of the low-temperature medium pump. (4) The non-metallic adsorption material in the vacuum holding box can effectively adsorb the gas molecules remaining in the vacuum layer, prolong the vacuum holding time, and improve the reliability and durability of the equipment operation. (5) By setting up the exhaust valve, safety valve and pressure gauge on the safety components, the safe and stable operation of the equipment is fully guaranteed. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a structural schematic diagram provided for an embodiment of the present invention.

[0015] Figure 2 Internal structure diagram provided for embodiments of the present invention Figure 1 .

[0016] Figure 3 Internal structure diagram provided for embodiments of the present invention Figure 2 .

[0017] Figure 4 A schematic diagram of the connection of the inner cylinder provided in an embodiment of the present invention. Figure 1 .

[0018] Figure 5 A schematic diagram of the connection of the inner cylinder provided in an embodiment of the present invention. Figure 2 .

[0019] Figure 6 This is a top view of the inner cylinder connection provided in an embodiment of the present invention.

[0020] The diagram shows the following components: 1. Outer cylinder; 11. Vacuum nozzle; 12. Vacuum holding box; 13. Insulation sleeve; 2. Vacuum layer; 3. Intermediate cylinder; 4. Inner cylinder; 41. Pump wheel assembly; 42. Pump inlet pipe; 43. Pump outlet pipe; 44. Inner cylinder monitoring system; 5. Jacket layer; 51. Coil; 52. Venturi flow meter; 53. Flow meter lead pipe; 54. Outlet shut-off valve; 55. Circulation outlet pipe; 56. Circulation inlet pipe; 57. Jacket layer monitoring system; 6. First replenishment pipe; 7. Second replenishment pipe; 71. Diverter pipe; 72. Inner cylinder replenishment valve; 8. Safety components; 81. Exhaust valve; 82. Safety valve; 83. Pressure gauge; 9. Cryogenic medium pump. Detailed Implementation

[0021] like Figures 1-6 As shown, the test equipment for the cryogenic medium pump 9 provided in this embodiment includes an outer cylinder 1, an intermediate cylinder 3, and an inner cylinder 4, which are sequentially arranged from the outside to the inside, forming a vacuum layer 2, a jacket layer 5, and a test area for the inner cylinder 4 from the outside to the inside. The vacuum layer 2 and the jacket layer 5 filled with cryogenic medium provide a stable test environment for the inner cylinder 4.

[0022] The outer cylinder 1 is made of 304 stainless steel, with a thickness of 6 mm, an inner diameter of 800 mm, and a height of 1000 mm. Figure 1 As shown, a vacuum nozzle 11, communicating with the vacuum layer 2, is installed on the outer cylinder 1. The vacuum nozzle 11 is DN20 and connected to a vacuum pump (ultimate vacuum ≤1Pa). A vacuum holding box 12, measuring 300mm × 200mm × 150mm, is located inside the vacuum layer 2. This box is filled with non-metallic adsorbent material, such as molecular sieves or activated carbon, to adsorb residual gas molecules within the vacuum layer 2, extending the vacuum maintenance time. After a single vacuuming operation, this equipment can stably maintain a vacuum level (≤10Pa) for over 25,000 hours, while existing equipment, under the same initial vacuum level, only maintains a stable vacuum level for approximately 8,700 hours, significantly improving the reliability and durability of the equipment. Casters are installed at the bottom of the outer cylinder 1 for easy movement of the testing equipment.

[0023] The intermediate cylinder 3 is made of 304 stainless steel, with a thickness of 6 mm, an inner diameter of 800 mm, and a height of 800 mm.

[0024] The inner cylinder 4 is made of 316L stainless steel, with a thickness of 6mm, an inner diameter of 600mm, a height of 600mm, and an effective volume of 200L.

[0025] The outer cylinder 1 is equipped with a first replenishing pipe 6 and a second replenishing pipe 7. The first replenishing pipe 6 is connected to the inner cylinder 4 and replenishes the inner cylinder 4 with a low-temperature medium. The second replenishing pipe 7 is connected to the jacket layer 5 and replenishes the jacket layer 5 with a low-temperature medium. The low-temperature medium in the jacket layer 5 provides a relatively stable and balanced low-temperature environment for the entire testing equipment, effectively isolating the external temperature fluctuations from affecting the state of the testing medium. The second replenishing pipe 7 is also equipped with a diversion pipe 71 connected to the inner cylinder 4, and an inner cylinder replenishing valve 7 is installed on the diversion pipe 71. 2. The inner cylinder replenishment valve 72 is model T238DJ25P-V. After opening the inner cylinder replenishment valve 72, the first replenishment pipe 6 and the second replenishment pipe 7 can simultaneously replenish the cryogenic medium into the inner cylinder 4 to meet the rapid injection requirements of the inner cylinder 4 for the cryogenic medium during the operation of the cryogenic medium pump 9. The time for this equipment to fill the inner cylinder 4 with the same volume (100L) of cryogenic medium is only 40%~50% of that of the existing equipment, which greatly saves the injection time and provides a favorable guarantee for the continuous and stable operation of the cryogenic medium pump 9.

[0026] The lower part of the jacket layer 5 is provided with coils 51, which are stainless steel pipes with a specification of DN25 and a length of 5m. The spacing between the coils 51 is 80mm. The inlet end of the coil 51 is connected to the inner cylinder 4, and the outlet end of the coil 51 is connected in sequence to a Venturi flow meter 52, a flow meter lead pipe 53, a liquid outlet shut-off valve 54, and a circulating liquid outlet pipe 55. A circulating liquid inlet pipe 56 communicating with the inner cylinder 4 is installed on the outer cylinder 1. The circulating liquid outlet pipe 55 and the circulating liquid inlet pipe 56 are connected outside the vacuum layer 2. A pump wheel assembly 41 is provided on the upper part of the inner cylinder 4. The bottom of the pump wheel assembly 41 is connected to... A pump inlet pipe 42 extends into the bottom of the inner cylinder 4. A pump outlet pipe 43 connected to the inlet end of the coil 51 is provided on the side wall of the pump wheel assembly 41. The coil 51, the circulating outlet pipe 55, the circulating inlet pipe 56 and the pump wheel assembly 41 form a closed-loop circulation channel. A cryogenic medium pump 9 connected to the pump wheel assembly 41 is installed in the middle of the top surface of the outer cylinder 1. When the cryogenic medium pump 9 is working, it drives the cryogenic medium to circulate in the circulation channel through the pump wheel assembly 41. During the flow of the cryogenic medium, the Venturi flow meter 52 and the flow meter lead pipe 53 monitor the cryogenic medium.

[0027] The outer cylinder 1 is also equipped with a safety component 8, a jacket layer 5 monitoring system, and an inner cylinder monitoring system 44. The safety component 8 is connected to the upper part of the inner cylinder 4. The safety component 8 monitors pressure and releases overpressure through an exhaust valve 81, a safety valve 82, and a pressure gauge 83. The pressure gauge 83 provides real-time feedback on the pressure of the inner cylinder 4, the safety valve 82 automatically opens to release pressure, and the exhaust valve 81 provides manual auxiliary pressure release to ensure the safe operation of the entire testing equipment. The jacket layer 5 monitoring system monitors the temperature and pressure of the medium in the jacket layer 5, the flow rate of the medium in the coil 51, and the flow velocity parameters of the medium in the coil 51. It includes a platinum resistance thermometer (measuring range -196℃~20℃, accuracy ±0.1℃), a pressure transmitter (measuring range 0~1.0MPa, accuracy ±0.2%FS), and a venturi flow meter 52 (measuring range 5-50m). 3 / h, accuracy ±0.5%FS); The inner cylinder monitoring system 44 monitors the medium temperature, pressure, and liquid level parameters of the inner cylinder 4, including a platinum resistance thermometer (measuring range -196℃~20℃, accuracy ±0.1℃), a pressure transmitter (measuring range 0~1.0MPa, accuracy ±0.2%FS), and a liquid level transmitter (measuring range 0~600mm, accuracy ±1mm). The vacuum layer 2 is equipped with an insulating sleeve 13 that wraps around the circulating liquid inlet pipe 56, the liquid outlet shut-off valve 54, the circulating liquid outlet pipe 55, the first liquid replenishment pipe 6, the second liquid replenishment pipe 7, the safety component 8, the jacket layer 5 monitoring system, and the inner cylinder monitoring system 44. The insulating sleeve is made of stainless steel and is 3.0mm thick. All pipes passing through the vacuum layer 2 are fitted with this insulating sleeve 13 to reduce the impact of pipe heat leakage on the test environment.

[0028] Performance comparison of this invention with existing equipment: Set the experimental parameters: Test medium: liquid nitrogen (boiling point -196℃, purity 99.99%).

[0029] Vacuum level 2: Initially evacuate to ≤10Pa, and maintain this vacuum level for testing.

[0030] Temperature of jacket layer 5: controlled within the range of -190℃ to -196℃.

[0031] Inner cylinder pressure: controlled within the range of 0.1~0.8MPa.

[0032] Test duration: 72 hours of continuous testing.

[0033] Operating parameters for cryogenic medium pump 9: Pump speed set at 8000 r / min, rated flow rate at 25 m³ / min. 3 / h, rated head 50m.

[0034] Under the above experimental parameters, a comparative experiment was conducted between this patented device and existing testing equipment. The test performance indicators and experimental results are shown in Table 1.

[0035] Table 1: Performance Comparison between Patented Equipment and Existing Testing Equipment Test performance metrics Test results of the equipment of this invention Test results of existing conventional equipment Improvement / Optimization 72h cryogenic medium replenishment volume (L) 85 132 Reduce by 55% Inner cylinder medium temperature fluctuation range (°C) ±2 ±6 The volatility decreased by 85.7%. Time (min) for the inner cylinder to be filled with 100L of medium 10 20 Time reduced by 50% Vacuum degree (≤10Pa) stabilization time (h) 25000 8700 Extended by 187.36% Pipeline heat leakage rate (W / m) 4.2 18.5 The heat leakage rate decreased by 77.3%. Error in flow rate test of cryogenic medium pump (%) ±2 ±10 Error reduced by 80% Cryogenic medium pump head test error (%) ±2 ±7 Error reduced by 71.43% The test results in Table 1 show that the test equipment for the cryogenic medium pump 9 of the present invention is significantly superior to existing conventional equipment in terms of energy saving and consumption reduction, test environment stability, medium replenishment speed, vacuum maintenance capability, pipeline insulation effect and test data accuracy, and can effectively meet the high-performance test requirements of the cryogenic medium pump 9.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications and substitutions based on the technical solutions and inventive concepts provided by the present invention should be covered within the scope of protection of the present invention.

Claims

1. A testing device for a cryogenic medium pump, characterized in that: The system comprises an outer cylinder (1), a middle cylinder (3), and an inner cylinder (4) arranged sequentially from the outside in, forming a vacuum layer (2) and a jacket layer (5) from the outside in. The outer cylinder (1) is equipped with a vacuum nozzle (11) that communicates with the vacuum layer (2). The outer cylinder (1) is provided with a first replenishing pipe (6) and a second replenishing pipe (7). The first replenishing pipe (6) communicates with the inner cylinder (4), and the second replenishing pipe (7) communicates with the jacket layer (5). The second replenishing pipe (7) is provided with a diverter pipe (71). The inner cylinder (4) is connected to the inner cylinder body (4). An inner cylinder replenishment valve (72) is installed on the diversion pipe (71). A coil (51) is provided at the lower part of the jacket layer (5). The inlet end of the coil (51) is connected to the inner cylinder body (4). The outlet end of the coil (51) is connected in sequence to a Venturi flow meter (52), a flow meter lead pipe (53), an outlet shut-off valve (54), and a circulation outlet pipe (55). A circulation inlet pipe (56) connected to the inner cylinder body (4) is installed on the outer cylinder (1). A circulation outlet pipe (55) is connected to the inner cylinder body (4). 5) The inner cylinder (4) is connected to the circulating inlet pipe (56) outside the vacuum layer (2). The upper part of the inner cylinder (4) is provided with a pump wheel assembly (41). The bottom of the pump wheel assembly (41) is connected to a pump inlet pipe (42) that extends into the bottom of the inner cylinder (4). The side wall of the pump wheel assembly (41) is provided with a pump outlet pipe (43) that is connected to the inlet end of the coil (51). The coil (51), the circulating outlet pipe (55), the circulating inlet pipe (56) and the pump wheel assembly (41) form a closed-loop circulation channel. The top surface of the outer cylinder (1) A cryogenic medium pump (9) connected to the pump wheel assembly (41) is installed in the middle. The outer cylinder (1) is also equipped with a safety component (8), a jacket layer (5) monitoring system and an inner cylinder monitoring system (44). The vacuum layer (2) is equipped with an insulating sleeve (13) that wraps the circulating liquid inlet pipe (56), the liquid outlet shut-off valve (54), the circulating liquid outlet pipe (55), the first liquid replenishment pipe (6), the second liquid replenishment pipe (7), the safety component (8), the jacket layer (5) monitoring system and the inner cylinder monitoring system (44).

2. The testing equipment for the cryogenic medium pump according to claim 1, characterized in that: The vacuum layer (2) is provided with a vacuum holding box (12), which is filled with non-metallic adsorbent material.

3. The testing equipment for the cryogenic medium pump according to claim 2, characterized in that: The non-metallic adsorbent material is a molecular sieve or activated carbon.

4. The testing equipment for the cryogenic medium pump according to claim 1, characterized in that: The safety component (8) is connected to the upper part of the inner cylinder (4), and the safety component (8) includes an exhaust valve (81), a safety valve (82) and a pressure gauge (83).

5. The testing equipment for the cryogenic medium pump according to claim 1, characterized in that: The jacket layer (5) monitoring system monitors the medium temperature, pressure, medium flow rate in the coil (51), and medium velocity parameters in the coil (51) within the jacket layer (5).

6. The testing equipment for the cryogenic medium pump according to claim 1, characterized in that: The inner cylinder monitoring system (44) monitors the medium temperature, pressure, and liquid level parameters of the inner cylinder (4).

7. The testing equipment for the cryogenic medium pump according to claim 1, characterized in that: The vacuum layer (2), jacket layer (5), inner cylinder (4) and insulation sleeve (13) are all made of stainless steel. The inner cylinder (4) is made of 316L stainless steel and the insulation sleeve (13) is 3 mm thick.

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