CN216012641U - Test loop for testing mechanical seal for nuclear main pump - Google Patents
Test loop for testing mechanical seal for nuclear main pump Download PDFInfo
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- CN216012641U CN216012641U CN202122485282.7U CN202122485282U CN216012641U CN 216012641 U CN216012641 U CN 216012641U CN 202122485282 U CN202122485282 U CN 202122485282U CN 216012641 U CN216012641 U CN 216012641U
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Abstract
The utility model relates to a test return circuit for testing mechanical seal for nuclear main pump, it includes: a primary circuit system and a pressure control system; the main loop system comprises a water tank and a mechanical sealing tool; the outlet of the water tank is connected with the inlet of the mechanical sealing tool through a main pipeline; a plunger pump is arranged on the main pipeline; the backflow outlet of the mechanical sealing tool is connected with the inlet of the water tank, and the water tank and the mechanical sealing tool form a closed loop; the pressure control system comprises an expansion tank and a pressure source; the expansion tank provides static pressure for a closed loop formed by the water tank and the mechanical sealing tool, and a first medium in the water tank flows to the mechanical sealing tool along a main pipeline under the power provided by the plunger pump and flows back to the water tank through the mechanical sealing tool so as to perform sealing test on the mechanical sealing tool. The utility model provides a test return circuit for testing mechanical seal for nuclear main pump has the medium clean, can carry out advantages such as thermal shock test, security height.
Description
Technical Field
The utility model belongs to the test field, more specifically say, relate to a test return circuit for testing mechanical seal for nuclear main pump.
Background
The mechanical seal for the nuclear main pump is used for controlling the leakage of reactor coolant along a pump shaft, is a key part of the main pump and is closely related to the safe and reliable operation of the main pump. As the mechanical sealing mechanism relates to a plurality of disciplines such as tribology, materials science, hydrodynamics, solid mechanics, heat transfer science, lubrication theory and the like, a complete design theory has not been formed so far, and a plurality of data are obtained by means of experiments. However, many mechanical seal manufacturers are only able to perform single, offline tests. Therefore, it is important to have a complete and complete test loop.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a test return circuit for testing mechanical seal for the nuclear main pump can truly simulate the operational aspect of mechanical seal for the nuclear main pump under operating condition, and the design of verifying mechanical seal accords with technical specification requirement, guarantees security and the reliability of mechanical seal at nuclear main pump operation in-process.
In order to achieve the above object, the utility model provides a test loop for testing mechanical seal for nuclear main pump, it contains: a primary circuit system and a pressure control system; the main loop system comprises a water tank and a mechanical sealing tool; the outlet of the water tank is connected with the inlet of the mechanical sealing tool through a main pipeline; a plunger pump is arranged on the main pipeline; the backflow outlet of the mechanical sealing tool is connected with the inlet of the water tank, and the water tank and the mechanical sealing tool form a closed loop; the pressure control system comprises an expansion tank and a pressure source, the lower end of the expansion tank is connected with a main pipeline in the main loop system, and the pressure source provides compressed air for the expansion tank; the expansion tank provides static pressure for a closed loop formed by the water tank and the mechanical sealing tool, and a first medium in the water tank flows to the mechanical sealing tool along a main pipeline under the power provided by the plunger pump and flows back to the water tank through the mechanical sealing tool so as to perform sealing test on the mechanical sealing tool.
The test loop for testing the mechanical seal for the nuclear main pump further comprises a cooling system, wherein the cooling system comprises a cooling tower and a plate heat exchanger; the plate heat exchanger is respectively connected with the water tank and the cooling tower in series through two different pipelines so as to cool the main loop system; and a fourth electric regulating valve is also arranged between the plate heat exchanger and the water tank. The test loop for testing the mechanical seal for the nuclear main pump further comprises a heating system, wherein the heating system comprises an electric heating tank and a third electric regulating valve; the outlet of the electric heating tank is connected with the outlet of the water tank through a main pipeline; the third electric regulating valve is arranged between the plate heat exchanger and the electric heating tank; wherein, through adjusting fourth electrical control valve and third electrical control valve, can make mechanical seal frock communicate with water pitcher or electrical heating jar respectively to carry out normal test or thermal shock test to mechanical seal frock.
The main pipeline is provided with a shunt port through the plunger pump, and is divided into a first pipeline and a second pipeline after passing through the shunt port, the first pipeline is connected with an inlet of the mechanical sealing tool, and the second pipeline is connected with an inlet of the water tank; wherein, the second pipeline is also provided with a confluence port.
The mechanical sealing tool comprises a three-stage sealing tool arranged at the upper part of the mechanical sealing tool and a balance sealing tool arranged at the lower part of the mechanical sealing tool; the tertiary sealed frock is last to be provided with: the first leakage outlet is connected with a first measuring cup and used for measuring the low-pressure leakage amount of the mechanical sealing tool, and the first backflow outlet is connected with the confluence port on the second pipeline through a third pipeline; the balance seal tool is provided with: the second leakage outlet is connected with a second measuring cup and used for measuring the balanced sealing leakage amount of the mechanical sealing tool, and the second backflow outlet is connected with a confluence port on the second pipeline through a fourth pipeline; and the third pipeline and the fourth pipeline are connected with the water tank through the second pipeline after being converged at the confluence port.
A first pneumatic regulating valve and a second flowmeter are sequentially arranged on a second pipeline between the flow dividing port and the confluence port; a second pneumatic regulating valve and a fourth flowmeter are sequentially arranged on a fourth pipeline between the second backflow outlet and the confluence port and are used for regulating the flow of sealing injection water in a mechanical sealing tool test; and a first electric regulating valve and a third flow meter are sequentially arranged on the third pipeline between the first backflow port and the confluence port and are respectively used for regulating and controlling the connection or disconnection of the third pipeline and measuring the flow of the third pipeline.
Wherein the upper end of the expansion tank is provided with an air outlet pipe; and the electromagnetic valve is arranged on the air outlet pipe, and when the pressure in the closed loop exceeds a set value, the electromagnetic valve is opened, and gas is released to the outside through the air outlet pipe, so that the pressure of the closed loop is ensured to be within a safety range.
The plate heat exchanger comprises a primary side and a secondary side, and the primary side of the plate heat exchanger is connected with the second pipeline in series; the secondary side of the plate heat exchanger is connected with a cooling tower in series through a sixth pipeline, and the cooling tower and the plate heat exchanger form an annular closed loop; a second medium stored in the cooling tower circulates along a sixth pipeline, the second medium flows to the plate heat exchanger, the second medium on the secondary side of the plate heat exchanger absorbs the heat of the first medium on the primary side of the plate heat exchanger, and the second medium after absorbing the heat flows back to the cooling tower from the secondary side along the sixth pipeline to form a cooling cycle; and a circulating pump, a second electric regulating valve and a fifth flowmeter are sequentially arranged on an annular closed loop formed by the cooling tower and the plate heat exchanger and used for controlling the flow of a second medium in the cooling system.
Compared with the prior art, the test loop for testing the mechanical seal for the nuclear main pump has the following beneficial effects: 1. the medium energy used by the test loop of the utility model is clean and environment-friendly; 2. The test loop of the utility model can simulate normal operation test, and can also utilize the heat medium heated by the electric heating tank to perform thermal shock test on the mechanical seal; 3. the pressure control system is arranged in the test loop, so that the pressure of the test loop is automatically controlled, and the potential safety hazard caused by overhigh pressure of the test loop is effectively prevented; 4. the utility model discloses experimental return circuit is through setting up cooling system, and the experimental return circuit of guarantee goes on under the temperature of experimental demand, has improved experimental accuracy.
Drawings
Fig. 1 is a schematic structural diagram of a test loop for testing a mechanical seal for a nuclear main pump according to the present invention.
Detailed Description
The technical solution, structural features, achieved objects and effects of the embodiments of the present invention will be described in detail below with reference to fig. 1 of the embodiments of the present invention.
It should be noted that the drawings are simplified and have non-precise ratios, and are only used for convenience and clarity to assist in describing the embodiments of the present invention, and are not used for limiting the conditions of the present invention, so they have no technical essential meaning, and any structural modification, ratio relationship change or size adjustment should still fall within the scope covered by the present invention without affecting the function and the achievable purpose of the present invention.
It is to be noted that, in the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The utility model provides a test return circuit for testing mechanical seal for nuclear main pump, as shown in FIG. 1, this test mechanical seal's for nuclear main pump test return circuit includes: a main loop system A, a pressure control system B, a heating system C and a cooling system D;
wherein the main loop system a includes: the water tank 1 and the mechanical sealing tool 3; the lower end of the water tank 1 is provided with an outlet E10 and an inlet E11, the outlet E10 is connected with the inlet E30 of the mechanical seal tool 3 through a main pipe R0, a plunger pump 01 is arranged on the main pipe R0 between the outlet E10 of the water tank 1 and the inlet E30 of the mechanical seal tool 3, and the plunger pump 01 is a fixed displacement pump and is used for providing power for the first medium stored in the water tank 1 and controlling the flow of the first medium entering the mechanical seal tool 3; a main pipeline R0 passes through a plunger pump 01 and is provided with a diversion port K1, a main pipeline R0 passes through the diversion port K1 and is divided into two parallel-connected first pipeline R1 and second pipeline R2, the first pipeline R1 is connected with an inlet E30 of a mechanical seal tool 3, a first flowmeter F01 is arranged on the first pipeline R1, the second pipeline R2 is connected with an inlet E11 of a water tank 1, a confluence port K2 is arranged on the second pipeline R2, and a first pneumatic regulating valve 04 and a second flowmeter F06 are sequentially arranged on a second pipeline R2 between the diversion port K1 and the confluence port K2; the first medium (in this embodiment, the first medium is water) stored in the water tank 1 flows out from the outlet E10 of the water tank 1 and then flows along the main pipe R0, and after passing through the plunger pump 01, one path of the first medium enters the mechanical seal tool 3 along the first pipe R1, and the other path of the first medium flows back to the water tank 1 along the second pipe R2.
The upper part of the mechanical seal tool 3 is a three-stage seal tool, and the lower part of the mechanical seal tool is a balance seal tool; the three-stage sealing tool is provided with two outlets, a first outlet E31 (leakage outlet) is connected with a first measuring cup F02 and used for measuring low-pressure leakage of the mechanical sealing tool 3, a second outlet E32 (backflow outlet) is connected with a confluence port K2 of a second pipeline R2 through a third pipeline R3, and a first electric regulating valve 02 and a third flow meter F04 are sequentially arranged on the third pipeline R3 between the second outlet E32 and the confluence port K2; the balanced sealing tool is provided with two outlets, a third outlet E33 (leakage outlet) is connected with a second measuring cup F03 and used for measuring the balanced sealing leakage amount of the mechanical sealing tool 3, a fourth outlet E34 (backflow outlet) is connected with a confluence port K2 of a second pipeline R2 through a fourth pipeline R4, a second pneumatic adjusting valve 03 and a fourth flowmeter F05 are sequentially arranged on the fourth pipeline R4 between the fourth outlet E34 and the confluence port K2, and the third pipeline R3 and the fourth pipeline R4 are connected with the water tank 1 through the second pipeline R2 after the confluence port K2 of the second pipeline R2 is converged.
The first electric control valve 02 is kept in a normally open state when a normal operation test is carried out on the loop, operation is not needed, and when an accident condition test (a simulated high-pressure leakage closing test) is carried out, the electric control valve 02 plays a role in cutting off the flow of the third pipeline R3; the third flow meter F04 is used for measuring the pipeline flow of the third pipeline R3, namely the high-pressure leakage pipeline flow (the normal range is 800-850L); the opening degrees of the second pneumatic regulating valve 03 and the first pneumatic regulating valve 04 are adjusted by observing the flow rates of the fourth flowmeter F05 and the second flowmeter F06, so that the injection flow rate of the first medium in the first pipeline R1 flowing into the mechanical seal tool 3 is adjusted, and the flow rate of the fourth flowmeter F05 is 1m3H, the flow rate of the second flowmeter F06 is 4.2m3The flow rate of the first flowmeter F01 for injecting water into the mechanical seal tool 3 is 1.8m3H; the first medium in the first pipeline R1 flows into the mechanical seal tool 3 and then is divided into two paths, wherein one path flows upwards and flows out after passing through the three-stage seal tool; the other path flows downwards and flows out after passing through the balance sealing tool.
Wherein the pressure control system B comprises: an expansion tank 5, a solenoid valve 07 and a pressure source 501; an air outlet pipe E51 extends from the upper end of the expansion tank 5, and a first medium (in the embodiment, the first medium is water) is stored at the lower end and is connected with a main pipe R0; the electromagnetic valve 07 is arranged on the air outlet pipe E51, a pressure value is set for the electromagnetic valve 07, when the loop pressure exceeds a set value, the electromagnetic valve 07 is automatically opened, gas is released to the outside, and when the loop pressure is lower than the set value, the electromagnetic valve 07 is automatically closed, so that the pressure of a test loop can be ensured to be within a safety range; the installation height of the expansion tank 5 is higher than that of any equipment in the whole closed test loop, the pressure source 501 injects compressed air from the top of the expansion tank 5 to apply pressure to the first medium in the expansion tank 5, and then static pressure is provided for the whole closed test loop, and meanwhile, the first medium is always stored at the lower end in the expansion tank 5, so that the compressed air can be effectively prevented from entering the test loop.
Wherein the cooling system D comprises: a cooling tower 6 and a plate heat exchanger 4; a second medium is stored in the cooling tower 6 and used for cooling a pipeline in the main loop system A; the plate heat exchanger 4 comprises a primary side (hot side) and a secondary side (cold side), the primary side of the plate heat exchanger 4 is connected with the second pipeline R2 in series, namely the primary side of the plate heat exchanger is connected with the main loop system a in series; the secondary side of the plate heat exchanger 4 is connected in series with the cooling tower 6 through a sixth pipeline R6, and the cooling tower 6 and the plate heat exchanger 4 form an annular closed loop.
When the cooling system D is in operation, the second medium (in this embodiment, the second medium is water) flows out of the cooling tower 6 and flows along the sixth conduit R6, when the second medium flows into the plate heat exchanger 4, the second medium in the sixth conduit R6 on the secondary side of the plate heat exchanger 4 absorbs heat of the first medium in the second conduit R2 on the primary side of the plate heat exchanger 4, the second medium after absorbing the heat flows back to the cooling tower 6 along the sixth conduit R6 from the secondary side, the cooling tower 6 cools the second medium, and the cooled second medium reenters the sixth conduit R6 to form a cooling cycle.
Wherein, a circulating pump 09, a second electric regulating valve 10 and a fifth flowmeter F07 are sequentially arranged on a sixth pipeline R6 in the cooling system D; the heat exchange rate of the plate heat exchanger 4 is controlled by observing the flow value of a fifth flow meter F07 on the secondary side, and the opening degree of the second electric regulating valve 10 is regulated according to the flow value of the fifth flow meter F07, so that the temperature of the test loop is controlled (the larger the flow of the plate heat exchanger 4 is, the better the heat exchange effect is); the circulation pump 09 circulates the second medium in the sixth conduit R6.
Wherein the heating system C comprises: an electric heating tank 2 and a third electric regulating valve 06; the outlet E20 of the electric heating tank 2 is connected with the outlet E10 of the water tank 1 in parallel through a pipeline to form a main pipeline R0, and the electric heating tank 2 is used for heating a third medium (in the embodiment, the third medium is water);
wherein, the second pipeline R2 is connected in parallel with the inlet E11 of the water tank 1 and the inlet E21 of the electric heating tank 2 through two different pipelines respectively after passing through the plate heat exchanger 4.
Wherein the third electric control valve 06 is arranged on the pipeline between the plate heat exchanger 4 and the electric heating tank 2; a fourth electric regulating valve 05 is also arranged on the pipeline between the plate heat exchanger 4 and the water tank 1; the test type of the test loop is controlled by adjusting the switches of the fourth electric control valve 05 and the third electric control valve 06; opening the fourth electric regulating valve 05, closing the third electric regulating valve 06, enabling the water tank 1 to be communicated with the mechanical sealing tool 3 through the main pipeline R0 and the first pipeline R1 and to be disconnected with the electric heating tank 2, and enabling a test loop to be in a normal operation test; conversely, the fourth electric control valve 05 is closed, the third electric control valve 06 is opened, the electric heating tank 2 is communicated with the mechanical seal tool 3 through the main pipeline R0 and the first pipeline R1 and is disconnected from the water tank 1, and the test loop is in a thermal shock test.
The thermal shock test is used for testing the sealing performance of the mechanical sealing tool 3 under the instant high temperature, when the thermal shock test is carried out on the test loop, the electric heating tank 2 is used for heating the third medium in advance, when the temperature of the third medium in the electric heating tank 2 is raised to the temperature required by the thermal shock test, the third medium enters the mechanical sealing tool 3 through the main pipeline R0 and the first pipeline R1, the temperature in the mechanical sealing tool 3 is instantly raised due to the inflow of the third medium, and thermal shock is formed; the direction of circulation of the third medium is defined by switching the electric control valve, i.e. opening the third electric control valve 06 while closing the fourth electric control valve 05, and the third medium flows back to the electric heating tank 2 via the plate heat exchanger 4 and the third electric control valve 06, since the fourth electric control valve 05 is in the closed state.
And a pressure gauge and a temperature gauge are respectively arranged on the first pipeline R1, the second pipeline R2, the third pipeline R3, the sixth pipeline R6, the water tank 1, the electric heating tank 2, the mechanical sealing tool 3 and the expansion tank 5 and used for monitoring the pressure and the temperature of the test loop.
When the test circuit for testing the mechanical seal for the nuclear main pump performs a normal operation test, the test process is as follows:
step S1, opening the fourth electric regulating valve 05, closing the third electric regulating valve 06, and enabling the water tank 1 to be communicated with the mechanical sealing tool 3 and disconnected with the electric heating tank 2 through a main pipeline R0 and a first pipeline R1;
step S2, the whole test loop is filled with a first medium, and the pressure source 501 injects 3bar of compressed air into the expansion tank 5, namely, static pressure is provided for the whole test loop;
step S3, starting the plunger pump 01, and starting the mechanical seal tool 3 (the mechanical seal tool 3 is connected with the rotating shaft through the motor to rotate) to operate when the minimum pressure (more than or equal to 2MPa) for starting the mechanical seal tool 3 is reached;
step S4, the opening degree of the second pneumatic control valve 03 and the first pneumatic control valve 04 is adjusted to make the flow rate of the fourth flowmeter F05 about 1m3H, the flow rate of the second flowmeter F06 is about 4.2m3H, i.e. the flow rate of the first flow meter F01 is about 1.8m3H (because the plunger pump is a 6m pump)3A metering pump of/h) to meet the working condition requirement of normal operation of the mechanical seal tool 3;
step S5, enabling a first medium to flow into the mechanical seal tool 3, and observing the leakage amount of the first measuring cup F02 and the second measuring cup F03 in the test process, namely respectively observing the low-pressure leakage amount and the balance seal leakage amount of the mechanical seal tool 3; the normal operation needs to be carried out for a long time of hundreds of hours or even thousands of hours;
and step S6, stopping the mechanical seal tool 3 and the plunger pump 01 after the test is finished.
In step S5, the temperature of the injected first medium is controlled to be 25-55 ℃ (i.e. the temperature of the water tank 1 is in this temperature range).
The utility model discloses a test return circuit for testing mechanical seal for nuclear main pump still can follow normal running test and switch to thermal shock test, thermal shock test's test process as follows: firstly, heating a third medium by using an electric heating tank 2; when the third medium is heated to the thermal shock required temperature (such as 80 ℃); the fourth electric regulating valve 05 is closed, and the third electric regulating valve 06 is opened, so that the electric heating tank 2 is communicated with the mechanical sealing tool 3 through the main pipeline R0 and the first pipeline R1 and is disconnected from the water tank 1; then, the opening and running states of the plunger pump 01 and the mechanical seal tool 3 are kept, a third medium enters the mechanical seal tool 3 through the main pipeline R0 and the first pipeline R1, the temperature in the mechanical seal tool 3 is instantly increased due to the inflow of the third medium, and thermal shock is formed; the leakage amount of the first measuring cup F02 and the second measuring cup F03 is observed in the thermal shock test process, namely the low-pressure leakage amount and the balance seal leakage amount of the mechanical seal tool 3 are respectively observed; and (5) stopping the mechanical seal tool 3 and the plunger pump 01 after the test is finished. To sum up, compare with current mechanical seal's test circuit, the utility model provides a test circuit for testing mechanical seal for nuclear main pump has the medium clean, can carry out advantages such as thermal shock test, security height.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (8)
1. A test circuit for testing a mechanical seal for a nuclear main pump, comprising: a main circuit system (A) and a pressure control system (B);
the main loop system (A) comprises a water tank (1) and a mechanical seal tool (3); an outlet (E10) of the water tank (1) is connected with an inlet (E30) of the mechanical sealing tool (3) through a main pipe (R0); a plunger pump (01) is arranged on the main pipeline (R0); a backflow outlet of the mechanical sealing tool (3) is connected with an inlet (E11) of the water tank (1), and the water tank (1) and the mechanical sealing tool (3) form a closed loop;
the pressure control system (B) comprises an expansion tank (5) and a pressure source (501), the lower end of the expansion tank (5) is connected with a main pipeline (R0) in the main loop system (A), and the pressure source (501) provides compressed air for the expansion tank (5);
wherein, expansion tank (5) provide static pressure to the closed circuit that water pitcher (1) and mechanical seal frock (3) formed, and the first medium in water pitcher (1) receives the power that plunger pump (01) provided to flow to mechanical seal frock (3) along trunk line (R0), flows back to water pitcher (1) through mechanical seal frock (3) to carry out the sealing test to mechanical seal frock (3).
2. Test circuit for testing the mechanical seal for a nuclear main pump according to claim 1, characterized in that it further comprises a cooling system (D),
the cooling system (D) comprises a cooling tower (6) and a plate heat exchanger (4); the plate heat exchanger (4) is respectively connected with the water tank (1) and the cooling tower (6) in series through two different pipelines so as to cool the main loop system (A);
and a fourth electric regulating valve (05) is also arranged between the plate-type heat exchanger (4) and the water tank (1).
3. Test circuit for testing the mechanical seal for a nuclear main pump according to claim 2, characterized in that it further comprises a heating system (C),
the heating system (C) comprises an electric heating tank (2) and a third electric regulating valve (06); the outlet (E20) of the electric heating tank (2) is connected with the outlet (E10) of the water tank (1) through a main pipeline (R0); the third electric regulating valve (06) is arranged between the plate heat exchanger (4) and the electric heating tank (2);
wherein, through adjusting fourth electrical control valve (05) and third electrical control valve (06), can make mechanical seal frock (3) communicate with water pitcher (1) or electrical heating jar (2) respectively to carry out normal test or thermal shock test to mechanical seal frock (3).
4. The test circuit for testing mechanical seals for a nuclear main pump according to claim 2,
a branch outlet (K1) is formed in the main pipeline (R0) through the plunger pump (01), the main pipeline (R0) is divided into a first pipeline (R1) and a second pipeline (R2) after passing through the branch outlet (K1), the first pipeline (R1) is connected with an inlet (E30) of the mechanical sealing tool (3), and the second pipeline (R2) is connected with an inlet (E11) of the water tank (1);
wherein the second pipeline (R2) is also provided with a confluence port (K2).
5. The test circuit for testing mechanical seals for a nuclear main pump according to claim 4,
the mechanical sealing tool (3) comprises a three-stage sealing tool arranged at the upper part of the mechanical sealing tool and a balance sealing tool arranged at the lower part of the mechanical sealing tool;
the tertiary sealed frock is last to be provided with: a first leakage outlet (E31) connected with a first measuring cup (F02) for measuring the low-pressure leakage of the mechanical seal tool (3), and a first backflow outlet (E32) connected with a confluence port (K2) on the second pipeline (R2) through a third pipeline (R3);
the balance seal tool is provided with: a second leakage outlet (E33) connected with a second measuring cup (F03) and used for measuring the balance seal leakage quantity of the mechanical seal tool (3), and a second backflow outlet (E34) connected with a confluence port (K2) on the second pipeline (R2) through a fourth pipeline (R4);
wherein the third pipeline (R3) and the fourth pipeline (R4) are connected with the water tank (1) through the second pipeline (R2) after being merged at the confluence port (K2).
6. The test circuit for testing mechanical seals for a nuclear main pump according to claim 5,
a first pneumatic regulating valve (04) and a second flowmeter (F06) are sequentially arranged on a second pipeline (R2) between the flow dividing port (K1) and the flow converging port (K2); a second pneumatic regulating valve (03) and a fourth flow meter (F05) are sequentially arranged on a fourth pipeline (R4) between the second backflow outlet (E34) and the confluence port (K2) and are used for regulating the flow of test sealing injection water of the mechanical sealing tool (3);
and a first electric regulating valve (02) and a third flow meter (F04) are sequentially arranged on a third pipeline (R3) between the first backflow port (E32) and the confluence port (K2) and are respectively used for regulating and controlling the connection or disconnection of the third pipeline (R3) and measuring the flow of the third pipeline (R3).
7. The test circuit for testing mechanical seals for a nuclear main pump according to claim 1,
an air outlet pipe (E51) is arranged at the upper end of the expansion tank (5), and a first medium is stored at the lower end;
the air outlet pipe (E51) is also provided with an electromagnetic valve (07), when the pressure in the closed loop exceeds a set value, the electromagnetic valve (07) is opened, gas is released to the outside through the air outlet pipe (E51), and the pressure of the closed loop is ensured to be in a safe range.
8. The test circuit for testing mechanical seals for a nuclear main pump according to claim 4,
the plate heat exchanger (4) comprises a primary side and a secondary side, and the primary side of the plate heat exchanger (4) is connected with the second pipeline (R2) in series; the secondary side of the plate heat exchanger (4) is connected with a cooling tower (6) in series through a sixth pipeline (R6), and the cooling tower (6) and the plate heat exchanger (4) form an annular closed loop;
the second medium stored in the cooling tower (6) flows along a sixth pipeline (R6), the second medium flows to the plate heat exchanger (4), the second medium on the secondary side of the plate heat exchanger (4) absorbs the heat of the first medium on the primary side of the plate heat exchanger (4), and the second medium after absorbing the heat flows back to the cooling tower (6) from the secondary side along the sixth pipeline (R6) to form a cooling cycle;
and a circulating pump (09), a second electric regulating valve (10) and a fifth flowmeter (F07) are sequentially arranged on an annular closed loop formed by the cooling tower (6) and the plate heat exchanger (4) and used for controlling the flow of a second medium in the cooling system (D).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122485282.7U CN216012641U (en) | 2021-10-15 | 2021-10-15 | Test loop for testing mechanical seal for nuclear main pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122485282.7U CN216012641U (en) | 2021-10-15 | 2021-10-15 | Test loop for testing mechanical seal for nuclear main pump |
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| Publication Number | Publication Date |
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| CN216012641U true CN216012641U (en) | 2022-03-11 |
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| CN202122485282.7U Active CN216012641U (en) | 2021-10-15 | 2021-10-15 | Test loop for testing mechanical seal for nuclear main pump |
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2021
- 2021-10-15 CN CN202122485282.7U patent/CN216012641U/en active Active
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