Submersible slurry pump two-phase testing device and heading machine

Abstract

The utility model discloses a diving slurry pump two-phase testing device and heading machine, including: a mud pit used for accommodating mud with a preset depth and a target diving slurry pump, the mud pit being respectively connected with a water injection pipe and a slurry injection pipe for injecting water and muck with a preset proportion so as to prepare mud with a preset density; the test circulation loop is used for being connected with the target submersible slurry pump and the slurry pool and used for simulating a preset load and testing the pumping performance of the target submersible slurry pump under the preset load; and the two ends of the auxiliary circulation loop are connected to the mud pool correspondingly, and the auxiliary circulation loop is used for mixing muck and water in the mud pool into mud and conducting circulating heat dissipation on the mud in the mud pool.

Description

Technical Field

[0001] The utility model relates to the technical field of submersible slurry pump testing, in particular to a two-phase testing device for a submersible slurry pump. In addition, the utility model also relates to a tunneling machine comprising the two-phase testing device for a submersible slurry pump. Background Art

[0002] With the development of urban smart garages and other projects, conventional excavation methods are inefficient and expensive. The caisson type tunnel boring machine is favored by construction personnel for its high efficiency and cost-effectiveness. The submersible slurry pump is the core equipment of the caisson type tunnel boring machine. Its function is to absorb and discharge the mud generated by the tunnel boring machine. Its performance and reliability directly determine the construction efficiency.

[0003] Conventional slurry pumps are divided into two separate parts, the motor and the pump, which are connected and driven by shafts, and the motor does not come into contact with mud and water. The working environment of submersible slurry pumps is quite special. They are completely submerged in mud to discharge slag. Their structure is different from conventional slurry pumps. The motor and pump are integrated, and mechanical seals are used to prevent mud and water from entering the motor cavity. Due to the special structure and working environment of submersible slurry pumps, they have high requirements for pumping, sealing and heat dissipation performance.

[0004] Submersible slurry pumps generally adopt the clean water design theory. The existing submersible slurry pump test environment is mostly a clean water environment. Since the physical properties of clean water and the solid-liquid two-phase liquid transported by the slurry pump are quite different, which is different from the actual mud environment, the test results are biased. In addition, the existing tests are mostly on-site inspections, which poses a great risk. On the other hand, the density of the two-phase test environment cannot be adjusted, and it is impossible to simulate the slag discharge performance of different formations. Utility Model Content

[0005] The utility model provides a two-phase test device for a submersible slurry pump and a tunneling machine, so as to solve the technical problems of large deviation in test results and low reliability in performance verification of existing submersible slurry pumps.

[0006] According to one aspect of the utility model, a two-phase testing device for a submersible slurry pump is provided, comprising:

[0007] A mud pool, used to accommodate mud of a preset depth and a target submersible slurry pump, the mud pool is respectively connected with a water injection pipe and a grouting pipe for injecting water and slag in a preset proportion to prepare mud of a preset density;

[0008] A test circulation loop, used to connect the target submersible slurry pump and the mud pool respectively, to simulate a preset load and test the pumping performance of the target submersible slurry pump under the preset load;

[0009] The auxiliary circulation loop has two ends respectively connected to the mud pool, and is used to mix the slag and water in the mud pool into mud and to circulate the mud in the mud pool to dissipate heat.

[0010] As a further improvement of the above technical solution, the test circulation loop includes an inner circulation pipeline and a first adjustment unit arranged on the inner circulation pipeline for adjusting the pipeline resistance, a first flow metering unit for collecting the pipeline mud flow and a pressure detection unit for collecting the mud pressure at the pump outlet.

[0011] As a further improvement of the above technical solution, the first regulating unit includes a resistance regulating valve, a gate valve or a stop valve.

[0012] As a further improvement of the above technical solution, the target submersible slurry pump is arranged at a preset height position in the mud pool to obtain the height difference between the inlet of the target submersible slurry pump and the slurry surface of the mud pool and to obtain the height difference between the outlet of the target submersible slurry pump and the slurry surface of the mud pool.

[0013] As a further improvement of the above technical solution, the auxiliary circulation loop includes an external circulation pipeline and an auxiliary slurry pump and a heat exchange mechanism arranged in the external circulation pipeline. The auxiliary slurry pump is used to pump the mud in the mud pool through the external circulation pipeline and then flow back to the mud pool. The heat exchange mechanism is used to exchange heat and cool the mud flowing through the external circulation pipeline with air.

[0014] As a further improvement of the above technical solution, the heat exchange mechanism includes a shower cooler or a water-cooled heat exchanger or an air-cooled heat exchanger.

[0015] As a further improvement of the above technical solution, a moisture sensor is provided in the target submersible slurry pump for detecting the sealing performance of the target submersible slurry pump.

[0016] As a further improvement of the above technical solution, it also includes a megohmmeter for detecting the insulation withstand voltage between the motor winding and the ground wire of the target submersible slurry pump, and the voltage value of the megohmmeter is greater than the motor voltage value of the target submersible slurry pump.

[0017] As a further improvement of the above technical solution, a temperature sensor is provided in the target submersible slurry pump for detecting the heat dissipation performance of the target submersible slurry pump.

[0018] According to another aspect of the utility model, a tunneling machine is also provided, which includes the above-mentioned submersible slurry pump two-phase testing device.

[0019] The utility model has the following beneficial effects:

[0020] This test device simulates the working environment of the submersible slurry pump submerged in mud through the mud pool, adjusts the injection ratio of the water injection pipe and the grouting pipe to adjust the mud density in the mud pool to simulate the mud environment of different formations, and can simulate different loads and test the pumping performance of the submersible slurry pump under different loads by setting up a test circulation loop to verify its reliability. During the test, the auxiliary circulation loop circulates the mud in the mud pool to fully mix it and dissipate the heat of the mud, thereby ensuring the reliability of the test results. This test device can adjust the density of the mud pool, simulate different two-phase environments, effectively test the pumping performance of the submersible slurry pump, and stir the mud evenly through the auxiliary circulation loop to prevent mud deposition, make the mud density uniform, and maintain its temperature stable while dissipating heat through circulation.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 It is a structural diagram of a preferred embodiment of the utility model.

[0024] Legend:

[0025] 1. Mud pool 2. Submersible slurry pump 3. Second regulating unit 4. Auxiliary slurry pump 5. Second flow metering unit 6. External circulation pipeline 7. Heat exchange mechanism 8. Pressure detection unit 9. First regulating unit 10. First flow metering unit 12. Water injection pipe 13. Grouting pipe. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0027] Figure 1 It is a structural diagram of a preferred embodiment of the utility model.

[0028] like Figure 1 As shown, the two-phase testing device for the submersible slurry pump 2 of this embodiment includes:

[0029] A mud pool 1 is used to contain mud of a preset depth and a target submersible slurry pump 2. The mud pool 1 is respectively connected with a water injection pipe 12 and a grouting pipe 13 for injecting water and slag in a preset proportion to prepare mud of a preset density;

[0030] A test circulation loop, used to connect the target submersible slurry pump 2 and the mud pool 1 respectively, and used to simulate a preset load and test the pumping performance of the target submersible slurry pump 2 under the preset load;

[0031] The auxiliary circulation loop has two ends connected to the mud pool 1 respectively, and is used to mix the slag and water in the mud pool 1 into mud and to circulate the mud in the mud pool 1 to dissipate heat.

[0032] It can be understood that the test device simulates the working environment of the submersible slurry pump 2 submerged in mud through the mud pool 1, adjusts the injection ratio of the water injection pipe 12 and the grouting pipe 13 to adjust the mud density in the mud pool 1 and then simulates the mud environment of different formations. By setting up a test circulation loop, it can simulate different loads and test the pumping performance of the submersible slurry pump 2 under different loads to verify its reliability. During the test, the auxiliary circulation loop circulates the mud in the mud pool 1 to fully mix it and dissipate the heat of the mud, thereby ensuring the reliability of the test results. The test device can adjust the density of the mud pool 1, simulate different two-phase environments, effectively test the pumping performance of the submersible slurry pump 2, and stir the mud evenly through the auxiliary circulation loop to prevent mud deposition, make the mud density uniform, and maintain its temperature stable while dissipating heat through circulation.

[0033] In this embodiment, the auxiliary circulation loop includes an external circulation pipe 6 and an auxiliary slurry pump 4 and a heat exchange mechanism 7 arranged in the external circulation pipe 6. The auxiliary slurry pump 4 is used to pump the mud in the mud pool 1 through the external circulation pipe 6 and then flow back to the mud pool 1. The heat exchange mechanism 7 is used to exchange heat and cool the mud flowing through the external circulation pipe 6 with air.

[0034] In this embodiment, the heat exchange mechanism 7 includes a cold shower or a water-cooled heat exchanger or an air-cooled heat exchanger. In this embodiment, a cold shower tower is taken as an example. The mud is sucked from the mud pool 1 into the external circulation pipe 6, sprayed into water mist by the cold shower tower for heat exchange and cooling with the air, and then flows back into the mud pool 1, so that the mud in the mud pool 1 is mixed and heat is dissipated.

[0035] In this embodiment, the test circulation loop includes an inner circulation pipeline and a first regulating unit 9 arranged on the inner circulation pipeline for adjusting the pipeline resistance, a first flow metering unit 10 for collecting the pipeline mud flow rate, and a pressure detection unit 8 for collecting the mud pressure at the pump outlet, wherein the first regulating unit 9 can be a resistance regulating valve, a gate valve, or a stop valve. In this embodiment, the resistance regulating valve is taken as an example, and the pressure detection unit 8 takes a pressure sensor as an example, and can also be a pressure gauge; the flow metering unit is a flow meter;

[0036] When the submersible slurry pump 2 is running, the mud in the mud pool 1 is pumped to the circulation pipeline and then flows into the mud pool 1; specifically, the first regulating unit 9 can adjust the circulation pipeline resistance to simulate different loads of the submersible pump, and the flow meter and pressure sensor respectively collect the flow rate and head under the current load; wherein, the pressure sensor is as close to the pump outlet as possible, and the pipeline resistance from the pump outlet to the pressure sensor section is ignored; there is a certain height difference between the pressure sensor position and the pump outlet (the pressure sensor position height is less than the pump outlet), and the pressure sensor displays a gauge pressure of P, and P and the pump head H have the following relationship:

[0037] H=P / ρg-h1-h2

[0038] Wherein, h1 is the vertical height between the inlet of the submersible slurry pump 2 and the water surface, h2 is the height between the outlet of the submersible slurry pump 2 and the pressure sensor, ρ is the mud density, and g is the local gravity acceleration; it should be understood that the above relationship is the prior art;

[0039] It can be understood that the target submersible slurry pump 2 is set at a preset height position in the mud pool 1 to obtain the height difference between the inlet of the target submersible slurry pump 2 and the slurry surface of the mud pool 1 and to obtain the height difference between the outlet of the target submersible slurry pump 2 and the slurry surface of the mud pool 1;

[0040] When testing the pumping performance, the first regulating unit 9 is fully opened in the initial state, the submersible slurry pump 2 is started, the speed is fixed at a certain value, the flow rate and head of the submersible slurry pump 2 in the initial working condition are recorded, and the regulating valve is gradually closed to reduce the flow rate by a certain value each time until the flow rate is close to 0, and the flow rate and head after each working point is stabilized are recorded; during the test, the auxiliary circulation loop is started, and the cooling mud flow rate is adjusted by controlling the speed of the auxiliary slurry pump 4 to keep the temperature of the mud pool 1 unchanged. The flow rate and head data of all working points are summarized and the head-flow curve is drawn; the product of the flow rate and the head is the effective work output by the pump, and its ratio to the motor power is the pumping efficiency. The pumping efficiency-flow curve is drawn, and this curve and the head-flow curve together constitute the pumping performance curve of the submersible slurry pump 2 at this speed.

[0041] In this embodiment, a moisture sensor is provided in the target submersible slurry pump 2 for detecting the sealing performance of the target submersible slurry pump. Before the submersible slurry pump 2 is hoisted into the mud pool 1, its sealing performance is fed back according to the moisture sensor; the testing device also includes a megohmmeter for detecting the insulation withstand voltage between the motor winding and the ground wire of the target submersible slurry pump 2. The voltage value of the megohmmeter is greater than the motor voltage value of the target submersible slurry pump 2. Whether it is normal is judged according to the resistance indication (under normal circumstances, the resistance value is greater than the insulation value); the submersible slurry pump 2 is hoisted into the mud pool 1, and the test is carried out to simulate the actual use conditions. After each pump stop, the insulation withstand voltage resistance between the motor winding and the ground wire is tested, and the moisture sensor is monitored throughout the process to determine whether it alarms.

[0042] In this embodiment, a temperature sensor is provided in the target submersible slurry pump 2 to detect the heat dissipation performance of the target submersible slurry pump; specifically, the submersible slurry pump 2 can be stabilized at the working point to be tested (fixed speed, flow, head), the initial bearing and winding temperatures are recorded, and the winding and bearing temperature rise curves are recorded after continuous operation for a certain period of time. During the test, the auxiliary circulation loop is started, and the cooling mud flow is adjusted by controlling the speed of the auxiliary slurry pump 4 to keep the temperature of the mud pool 1 unchanged.

[0043] It can be understood that the outer circulation pipeline 6 is provided with a second regulating unit 3 and a second flow metering unit 5 so as to accurately regulate the flow of the outer circulation pipeline 6 according to the second flow metering unit 5 .

[0044] The pumping performance, heat dissipation and sealing performance tests of the submersible slurry pump are realized through this testing device.

[0045] On the other hand, the present embodiment further provides a tunnel boring machine, which includes a submersible slurry pump and is applied with the above-mentioned testing device.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A two-phase test device for a submersible slurry pump, characterized in that: include: A mud pool (1) is used to contain mud of a preset depth and a target submersible slurry pump (2), and the mud pool (1) is respectively connected to a water injection pipe (12) and a grouting pipe (13) for injecting water and slag in a preset proportion to prepare mud of a preset density; A test circulation loop, used to connect the target submersible slurry pump (2) and the mud pool (1) respectively, and used to simulate a preset load and test the pumping performance of the target submersible slurry pump (2) under the preset load; The auxiliary circulation loop has two ends respectively connected to the mud pool (1) and is used to mix the slag and water in the mud pool (1) into mud and to circulate the mud in the mud pool (1) to dissipate heat.

2. The two-phase testing device for a submersible slurry pump according to claim 1, characterized in that: The test circulation loop comprises an inner circulation pipeline and a first regulating unit (9) arranged on the inner circulation pipeline for regulating pipeline resistance, a first flow metering unit (10) for collecting pipeline mud flow, and a pressure detection unit (8) for collecting pump outlet mud pressure.

3. The two-phase testing device for a submersible slurry pump according to claim 2, characterized in that: The first regulating unit (9) comprises a resistance regulating valve, a gate valve or a stop valve.

4. The two-phase testing device for a submersible slurry pump according to claim 2, characterized in that: The target submersible slurry pump (2) is arranged at a preset height position in the mud pool (1) to obtain the height difference between the inlet of the target submersible slurry pump (2) and the slurry surface of the mud pool (1) and to obtain the height difference between the outlet of the target submersible slurry pump (2) and the slurry surface of the mud pool (1).

5. The two-phase testing device for a submersible slurry pump according to claim 1, characterized in that: The auxiliary circulation loop comprises an external circulation pipeline (6) and an auxiliary slurry pump (4) and a heat exchange mechanism (7) arranged in the external circulation pipeline (6); the auxiliary slurry pump (4) is used to pump the mud in the mud pool (1) through the external circulation pipeline (6) and then flow back to the mud pool (1); the heat exchange mechanism (7) is used to exchange heat and cool the mud flowing through the external circulation pipeline (6) with air.

6. The two-phase testing device for a submersible slurry pump according to claim 5, characterized in that: The heat exchange mechanism (7) comprises a shower cooler, a water-cooled heat exchanger or an air-cooled heat exchanger.

7. The two-phase testing device for a submersible slurry pump according to claim 1, characterized in that: A moisture sensor is arranged inside the target submersible slurry pump (2) for detecting the sealing performance of the target submersible slurry pump.

8. The two-phase testing device for a submersible slurry pump according to claim 7, characterized in that: It also includes a megohmmeter for detecting the insulation withstand voltage between the motor winding and the ground wire of the target submersible slurry pump (2), wherein the voltage value of the megohmmeter is greater than the motor voltage value of the target submersible slurry pump (2).

9. The two-phase testing device for a submersible slurry pump according to claim 1, characterized in that: A temperature sensor is arranged inside the target submersible slurry pump (2) for detecting the heat dissipation performance of the target submersible slurry pump.

10. A tunnel boring machine, characterized in that: The invention relates to a two-phase testing device for a submersible slurry pump according to any one of claims 1 to 9.

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