CN209764392U - Low-temperature supercooling circulating system and low-temperature circulating pump testing system - Google Patents

Abstract

The utility model discloses a low-temperature supercooling circulation system and a low-temperature circulation pump test system. , bypass circuit, constant pressure tank and saturated liquid pool, the cooling channel is set on the cooling target road; the subcooling heat exchanger is located in the saturated liquid pool, and the outlet of the low temperature circulation pump passes through the subcooling heat exchanger, cooling target circuit, and return flow in sequence The inlet of the low-temperature circulation pump is connected with the inlet of the low-temperature circulation pump; the bypass circulation path is connected between the inlet of the low-temperature circulation pump and the outlet of the subcooling heat exchanger, and the bottom port of the constant pressure tank is connected with the inlet of the low-temperature circulation pump. A heat balance heat exchanger is arranged in the constant pressure tank, the exhaust port of the saturated liquid pool is connected with the inlet of the heat balance heat exchanger, the exhaust port of the heat balance heat exchanger, the exhaust port of the constant pressure tank and the cooling The exhaust port of the target road is used to connect with the recovery system inlet outside the vacuum chamber.

Description

A low-temperature subcooling circulation system and a low-temperature circulation pump test system

technical field

The utility model belongs to the field of low-temperature engineering, and in particular relates to a low-temperature supercooling circulation system and a low-temperature circulation pump test system.

Background technique

In large-scale low-temperature projects, the supercooled fluid acts as a brine to cool the target. Because the low-temperature fluid is below 120K, the flow stability is particularly important. The low-temperature circulation pump is an important booster component, and the pressure at the inlet is the lowest. It is easy to become saturated and gasified rapidly, which not only produces cavitation, damages the low-temperature circulation pump, but also causes instability to the pressure of the entire cycle.

The pressure stability of the subcooling cycle itself depends on the constant pressure tank, and its own pressure stability level determines the pressure stability of the entire subcooling cycle. The prior art mostly relies on saturated liquid infiltration to maintain the thermal balance of the constant pressure tank, which is a natural convection method, the thermal balance is difficult to control, and the pressure stability is not good. In addition, the entire supercooled low-temperature cycle is placed in a Dewar-type cylinder, and it is difficult to completely insulate the top flange, and it is easy to condense or even frost.

In the low-temperature circulation pump test system, in the prior art, only the flow meter is used to measure the flow, and there is a lack of checking means.

Utility model content

In view of this, the utility model proposes a uniquely designed low-temperature subcooling circulation system and a low-temperature circulation pump test system to solve the problems introduced in the background technology above.

The technical scheme of the utility model is:

A low-temperature subcooling circulation system is characterized in that it includes a vacuum chamber 015, a cooling target path 003 and a cooling channel 004 outside the vacuum chamber 015, and the vacuum chamber 015 is provided with a low-temperature circulation pump 001, a subcooling heat exchanger 002, Return path 005, bypass circulation path 006, constant pressure tank 007 and saturated liquid pool 008, cooling channel 004 is set on the cooling target path 003, one end of the cooling target path 003 is connected to the subcooling heat exchanger 002, and the other end is connected to the return path 005 connection; wherein, the subcooling heat exchanger 002 is located in the saturated liquid pool 008, and the outlet of the low-temperature circulation pump 001 is connected to the inlet of the low-temperature circulation pump 001 through the subcooling heat exchanger 002, the cooling target circuit 003, and the return circuit 005 in sequence; The inlet of the low temperature circulating pump 001 is connected to the outlet of the subcooling heat exchanger 002, the bypass circuit 006 is connected, the bottom port of the constant pressure tank 007 is connected to the inlet of the low temperature circulating pump 001, and a heater 014 is arranged outside the constant pressure tank 007, A heat balance heat exchanger 011 is arranged in the constant pressure tank 007, the exhaust port of the saturated liquid pool 008 is connected with the inlet of the heat balance heat exchanger 011, the exhaust port of the heat balance heat exchanger 011, the discharge port of the constant pressure tank 007 The air port and the exhaust port of the cooling target path 003 are used to connect with the inlet of the recovery system 200 outside the vacuum chamber.

Further, an outlet pipe is provided on the outer side of the constant pressure tank 007; the lower end of the outlet pipe is connected to the bottom of the constant pressure tank 007, and the upper end is connected to the top of the constant pressure tank 007; the heater 014 is located in the outlet pipe.

Further, the distance between the heater 014 and the bottom of the constant pressure tank 007 does not exceed 1/3 of the total height of the constant pressure tank 007 .

Further, the top of the heat balance heat exchanger 011 is located below 1/2 of the height of the constant pressure tank 007 .

Further, an automatic pressure relief valve 009 is set at the exhaust port of the constant pressure tank 007; a valve 010 is set at the exhaust port of the cooling target road 003.

Further, the saturated liquid pool 008 is integrated with the subcooling heat exchanger 002 as a whole.

Further, the highest point of the subcooling heat exchanger 002 , the highest point of the cryogenic circulation pump 001 and the highest point of the bypass circulation path 006 are all lower than the lowest point of the constant pressure tank 007 .

Further, the saturated liquid pool 008 is provided with a first automatic replenishment valve 012 for connecting with the medium supply system 100 outside the vacuum chamber 015; the constant pressure tank 007 is provided with a second automatic replenishment valve 013 for connecting with the medium outside the vacuum chamber 015 The supply system 100 is connected.

Further, the cooling target path 003 is provided with a simulated load 016, and the inlet and outlet of the cooling channel 004 are provided with temperature sensors; the simulated load 016 evenly covers the cooling channel 004 by means of external winding.

A low-temperature circulation pump testing system, characterized in that it includes a vacuum chamber 015, a cooling target path 003 and a cooling channel 004 outside the vacuum chamber 015, and the vacuum chamber 015 is provided with a low-temperature circulation pump 001 to be tested and a subcooling heat exchanger 002, return flow path 005, bypass circulation path 006, constant pressure tank 007 and saturated liquid pool 008, the cooling channel 004 is set on the cooling target path 003, one end of the cooling target path 003 is connected to the subcooling heat exchanger 002, and the other end is connected to the The return flow path 005 is connected; wherein, the subcooling heat exchanger 002 is located in the saturated liquid pool 008, and the outlet of the low-temperature circulation pump 001 to be tested passes through the subcooling heat exchanger 002, the cooling target path 003, the return flow path 005 and the to-be-tested The inlet of the low-temperature circulation pump 001 is connected; the inlet of the low-temperature circulation pump 001 to be tested and the outlet of the subcooling heat exchanger 002 are connected to the bypass circulation path 006, and the bottom port of the constant pressure tank 007 is connected to the outlet of the low-temperature circulation pump 001 to be tested. The inlet is connected, a heater 014 is set outside the constant pressure tank 007, a heat balance heat exchanger 011 is set inside the constant pressure tank 007, the exhaust port of the saturated liquid pool 008 is connected with the inlet of the heat balance heat exchanger 011, and the heat balance heat exchanger 011 The exhaust port of the heater 011, the exhaust port of the constant pressure tank 007 and the exhaust port of the cooling target road 003 are connected with the inlet of the recovery system 200 outside the vacuum chamber; the saturated liquid pool 008 and the constant pressure tank 007 are connected with the vacuum chamber 015 The medium supply system 100 is connected; the main road of the cooling target road 003 is equipped with a flowmeter.

The low-temperature supercooling circulation system of the present utility model includes a low-temperature circulation pump 001, a supercooling heat exchanger 002, a cooling target road 003, a cooling channel 004, a return flow road 005, a bypass circulation road 006, a constant pressure tank 007, and a saturated liquid pool 008 , Vacuum chamber 015, constant pressure tank 007 is equipped with a unique heater 014, constant pressure tank 007 is equipped with a unique heat balance heat exchanger 011, the outlet of the low temperature circulation pump 001 is connected to the subcooling heat exchanger 002, and the outlet of the subcooling heat exchanger 002 Connected to the cooling target circuit 003 and the bypass circuit 006, the return circuit 005 and the bypass circuit 006 are connected to the inlet of the low-temperature circulation pump 001, and the bottom of the constant pressure tank 007 is connected to the front end of the inlet of the low-temperature circulation pump 001 through a tee for Set the pressure for the entire cycle. The exhaust port of the saturated liquid pool 008 is connected to the inlet of the heat balance heat exchanger 011 , and the exhaust port of the heat balance heat exchanger 011 , the exhaust port of the constant pressure tank 007 and the exhaust port of the cooling target road 003 converge to the recovery system 200 . Among them, the constant pressure tank 007 is designed based on the concept of heat balance, and a new heat balance heat exchanger 011 is introduced to stabilize the pressure. The traditional Dewar structure is replaced by a saturated liquid pool 008. The structure of the vacuum chamber 015 replaces the traditional radiation screen and is used for cold mass insulation.

In a preferred embodiment of the present utility model, the booster heater 014 of the constant pressure tank 007 is placed in the outlet pipe on the outer side of the constant pressure tank 007, as shown in the schematic diagram of FIG. 3 . The lower end of the outlet pipe is connected to the bottom of the constant pressure tank 007, and the upper end is connected to the top of the constant pressure tank 007. The position of the heater 014 does not exceed 1/3 of the total height of the constant pressure tank 007, that is, the distance from the bottom of the constant pressure tank does not exceed the constant pressure tank 1/3 of the total height of 007, the setting of the outlet pipe can improve the supercharging efficiency, see the schematic diagram in Figure 3.

In a preferred embodiment of the utility model, a heat balance heat exchanger 011 is arranged inside the constant pressure tank 007, as shown in Fig. 3, the inlet of the heat balance heat exchanger 011 is connected to the exhaust port of the saturated liquid pool 008, and the top of the heat balance heat exchanger 011 is located at Below 1/2 height of constant pressure tank 007.

In a preferred embodiment of the present utility model, an automatic pressure relief valve 009 is provided at the exhaust port of the constant pressure tank 007; a valve 010 is provided at the exhaust port of the cooling target road.

In a preferred embodiment of the utility model, the saturated liquid pool 008 and the subcooling heat exchanger 002 are integrated into a whole, and the saturated liquid pool 008 collects volatilized saturated gas and concentrates it at the exhaust port.

In a preferred embodiment of the present utility model, the highest point of the subcooling heat exchanger 002 , the low temperature circulation pump 001 and the bypass circulation path 006 is lower than the lowest point of the constant pressure tank 007 .

In a preferred embodiment of the present utility model, the saturated liquid pool 008 is provided with the first automatic liquid replenishment valve 012, and the constant pressure tank 007 is provided with the second automatic liquid replenishment valve 013. During the operation of the circulation system, the valves 012 and 013 are both connected to the medium supply system 100, to supplement and maintain the working medium.

In a preferred embodiment of the utility model, all components are installed or hoisted on the top flange 017 and placed in the vacuum chamber 015 .

Another low-temperature circulation pump test system provided by the utility model includes the low-temperature supercooled circulation system, the low-temperature circulation pump 001 to be tested, and the corresponding low-temperature saturated working medium, and the low-temperature circulation pump 001 to be tested is fixed on the top method On the blue, the flow part of the low temperature circulation pump 001 is located in the vacuum chamber 015, the outlet of the low temperature circulation pump 001 to be tested is connected to the inlet of the subcooling heat exchanger 002, the inlet of the low temperature circulation pump 001 to be tested is connected to the return port of the cooling target road 003, and the cooling target Install a flow meter on the main road of Road 003.

In a preferred embodiment of the present invention, the cooling target path 003 is provided with a simulated load 016, and the inlet and outlet of the cooling channel 004 are provided with temperature sensors. The simulated load 016 evenly covers the cooling channel 004 through external winding. The simulated load 016 is used to test the thermal index of the entire circulation system. The cooling channel is a heat exchange component between the simulated load 016 and the circulation system for heat exchange.

Compared with the prior art, the low-temperature subcooling circulation system and the low-temperature circulation pump test system provided by the utility model have the following advantages:

First, set the active heat exchange type constant pressure tank 007, and reuse the residual cold to facilitate the pressure control of the constant pressure tank 007;

Second, the whole system is placed in the vacuum chamber 015, which has excellent heat insulation and cold preservation effect, and the outer surface avoids dew and frost;

Third, set the thermal measurement and control element to simulate the load 016, which can accurately check the flow rate;

Fourth, set the bypass channel 006 for cooling the target channel 003, use the supercooled liquid in the bypass channel and the saturated gas in the target channel to mix and reflow, and increase the liquid ratio, which is conducive to the stable establishment of circulation.

Description of drawings

Figure 1 is a schematic diagram of a low temperature subcooling circulation system.

Fig. 2 is a schematic diagram of a low temperature circulation pump test system.

Fig. 3 is a schematic diagram of the structure of the constant pressure tank.

Among them, 000-low temperature subcooling circulation system, 001-low temperature circulation pump, 002-subcooling heat exchanger, 003-cooling target road, 004-cooling channel, 005-return flow road, 006-bypass circulation road, 007-fixed Pressure tank, 008-saturated liquid pool, 009-automatic pressure relief valve, 010-valve, 011-heat exchanger, 012-first automatic rehydration valve, 013-second automatic rehydration valve, 014-heater, 015-vacuum Chamber, 016-simulation load, 017-top flange, 100-medium supply system, 200-recovery system.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Referring to Fig. 1, the first embodiment of the present utility model provides a stable low-temperature subcooling circulation system 000, including a low-temperature circulation pump 001, a subcooling heat exchanger 002, a cooling target path 003, a cooling channel 004, and a bypass circulation path 006 , constant pressure tank 007, saturated liquid pool 008, vacuum chamber 015, constant pressure tank 007 is equipped with a unique heater 014, constant pressure tank 007 is equipped with a unique heat balance heat exchanger 011, and the outlet of the low temperature circulation pump 001 is connected to a subcooling heat exchanger 002, the outlet of the subcooling heat exchanger 002 is connected to the cooling target road 003 and the bypass circulation road 006, the two outlets are connected to the inlet of the low-temperature circulation pump 001, and the bottom of the constant pressure tank 007 is connected to the vicinity of the inlet of the low-temperature circulation pump 001. The outlet of the saturated liquid pool 008 is connected to the inlet of the heat balance heat exchanger 011 , and the outlet of the heat balance heat exchanger 011 , the outlet of the constant pressure tank and the outlet of the cooling target road converge to the recovery system 200 .

In this embodiment, the booster heater 014 of the constant pressure tank 007 is placed in the outlet pipe on the side of the constant pressure tank 007. The lower end of the outlet pipe is connected to the bottom of the constant pressure tank 007, and the upper end is connected to the top of the constant pressure tank 007. The heater 014 The position is not more than 1/3 of the total height of the super high constant pressure tank. The constant pressure tank 007 is equipped with a heat balance heat exchanger 011, the inlet of the heat exchanger 011 is connected to the exhaust port of the saturated liquid pool 008, and the top of the heat exchanger 011 is located below the height of the constant pressure tank 0071/2. The constant pressure tank 007 is provided with an automatic pressure relief valve 009. The highest point of the subcooling heat exchanger 002, the low temperature circulation pump 001 and the bypass circulation path 006 is lower than the lowest point of the constant pressure tank 007.

In this embodiment, the saturated liquid pool 008 is integrated with the subcooling heat exchanger 002 as a whole, and the saturated liquid pool 008 collects volatilized saturated gas and concentrates it at the exhaust port. All components are installed or hoisted on the top flange 017, wrapped with multi-layer heat insulation material outside, and placed in the vacuum chamber 015.

In this embodiment, during the use of the low-temperature subcooling circulation system, it is first necessary to purge or replace, and replace the saturated liquid pool 008, the constant pressure tank 007, the low-temperature circulation pump 001, and the subcooling heat exchanger 002 with pure working Medium, and then inject liquid into the constant pressure tank 007 and saturated liquid pool 008 to reach a suitable liquid level, and fully cool down the cooling target, and stop cooling when the cooling return temperature is close to the saturation temperature of the saturated liquid. The constant pressure tank 007 is self-pressurized to an appropriate pressure, and the low-temperature saturated liquid inside enters a supercooled state, then the low-temperature circulation pump 001 is started, and the bypass 006 cycle is established. After the cycle is stable, the equipment circulation is gradually opened, and the bypass 006 is gradually closed. Stable transition to the main road 003 cycle, and the subcooling cycle is established. During the circulation process, the heat load of the cooling object, the heat load of the low-temperature circulation pump 001, and the heat load of the transmission pipeline are dissipated into the saturated liquid by the subcooling heat exchanger 002 in the saturated liquid pool, and taken away by the latent heat of vaporization.

In this embodiment, the design of the subcooling heat exchanger 002 should refer to the thermal load of the cooling object and the thermal load of the low-temperature subcooling circulation system itself.

The second embodiment of the present utility model provides a low-temperature circulation pump test system, including the low-temperature subcooling circulation system introduced in the first embodiment, the low-temperature circulation pump 001 to be tested, the simulated load 016, and the corresponding low-temperature liquid storage tank 015, the low temperature circulation pump 001 to be tested is fixed on the top flange 017, the flow part of the low temperature circulation pump 001 is located in the vacuum chamber 015, the outlet of the low temperature circulation pump 001 to be tested is connected to the inlet of the subcooling heat exchanger 002, and the low temperature test is required The inlet of circulation pump 001 is connected to the return port of cooling target road 003, and the main road of cooling target road 003 is installed with a flow meter.

In the second embodiment, the flow rate is calculated by simulating the load 016 and the corresponding temperature parameters, which can be calibrated with the flowmeter to improve the accuracy of the flow parameter measurement, and the pressure head parameter can be measured by the pressure sensor arranged along the cycle.

Compared with the prior art, the low-temperature subcooling circulation system and the low-temperature circulation pump test system provided by the utility model have the following advantages: First, the active heat exchange type constant pressure tank 007 is set, and the residual cold is reused, which is convenient for the constant pressure tank 007 pressure control; second, the whole system is placed in the vacuum chamber 015, which has excellent heat insulation and cold preservation effect, and the outer surface avoids condensation and frost; third, the thermal measurement and control element is installed to accurately check the flow rate; fourth, the setting Cooling the bypass channel 006 of the target channel 003 is conducive to stably establishing circulation.

The above is only used to illustrate the technical solution of the present utility model, and is not to limit the utility model. Although the above-mentioned embodiments have been described in detail, those skilled in the art can Replacement, modification and simple changes are made to it, and these replacements, modifications and simple changes cannot make the essence of the corresponding technical solution deviate from the scope of the new embodiment of the present invention.

Claims (10)

1. A low-temperature supercooling circulating system is characterized by comprising a vacuum chamber (015), a cooling target circuit (003) and a cooling channel (004) outside the vacuum chamber (015), wherein a low-temperature circulating pump (001), a supercooling heat exchanger (002), a return circuit (005), a bypass circulating circuit (006), a constant pressure tank (007) and a saturated liquid pool (008) are arranged in the vacuum chamber (015), the cooling channel (004) is arranged on the cooling target circuit (003), one end of the cooling target circuit (003) is connected with the supercooling heat exchanger (002), and the other end of the cooling target circuit (003) is connected with the return circuit (005); wherein the supercooling heat exchanger (002) is positioned in the saturated liquid pool (008), and the outlet of the low-temperature circulating pump (001) is connected with the inlet of the low-temperature circulating pump (001) through the supercooling heat exchanger (002), the cooling target path (003) and the return path (005) in sequence; connect bypass circulation way (006) between the export of low temperature circulating pump (001)'s entry and subcooling heat exchanger (002), level pressure jar (007) bottom port links to each other with the entry of low temperature circulating pump (001), level pressure jar (007) outside sets up a heater (014), set up a heat balance heat exchanger (011) in level pressure jar (007), the gas vent of this saturated liquid pond (008) and the access connection of this heat balance heat exchanger (011), the gas vent of level pressure jar (007) and the gas vent of cooling target way (003) are used for with the outdoor recovery system (200) access connection in vacuum.

2. A low temperature supercooling cycle system of claim 1, wherein an outlet pipe is provided at an outer side of the constant pressure tank (007); the lower end of the eduction tube is connected with the bottom of the constant pressure tank (007), and the upper end of the eduction tube is connected with the topmost part of the constant pressure tank (007); the heater (014) is located within the exit tube.

3. The subcooling cycle system as defined in claim 2, wherein the heater (014) is spaced from the bottom of the constant pressure tank (007) by no more than 1/3 of the total height of the constant pressure tank (007).

4. A cryogenic subcooling cycle system as described in claim 1 or claim 2 or claim 3 wherein the top of the heat balance heat exchanger (011) is located below 1/2 of the height of the fixed pressure tank (007).

5. A low temperature supercooling cycle system of claim 1, wherein an automatic pressure relief valve (009) is provided at an exhaust port of the constant pressure tank (007); a valve (010) is provided at an exhaust port of the cooling target path (003).

6. A cryogenic subcooling cycle system as described in claim 1, wherein the saturated liquid sump (008) is integral with the subcooling heat exchanger (002).

7. the subcooling cycle system as described in claim 6, wherein the highest point of the subcooling heat exchanger (002), the highest point of the cryogenic circulating pump (001) and the highest point of the bypass circuit (006) are each lower than the lowest point of the surge tank (007).

8. A cryogenic subcooling cycle system as described in claim 1, wherein the saturated liquid reservoir (008) is provided with a first automatic replenishment valve (012) for connection to the media supply system (100) outside the vacuum chamber (015); the constant pressure tank (007) is provided with a second automatic liquid supplementing valve (013) for connecting with a medium supply system (100) outside the vacuum chamber (015).

9. The low temperature supercooling circulating system of claim 1, wherein the cooling target circuit (003) is provided with a dummy load (016), and the inlet and outlet of the cooling passage (004) are provided with temperature sensors; the simulation load (016) uniformly covers the cooling channel (004) through an external winding mode.

10. A low-temperature circulating pump test system is characterized by comprising a vacuum chamber (015), a cooling target path (003) and a cooling channel (004) outside the vacuum chamber (015), wherein a low-temperature circulating pump (001) to be tested, a supercooling heat exchanger (002), a return path (005), a bypass circulating path (006), a constant pressure tank (007) and a saturated liquid pool (008) are arranged in the vacuum chamber (015), the cooling channel (004) is arranged on the cooling target path (003), one end of the cooling target path (003) is connected with the supercooling heat exchanger (002), and the other end of the cooling target path (003) is connected with the return path (005); the supercooling heat exchanger (002) is positioned in the saturated liquid pool (008), and an outlet of the low-temperature circulating pump (001) to be tested is connected with an inlet of the low-temperature circulating pump (001) to be tested sequentially through the supercooling heat exchanger (002), the cooling target path (003) and the return path (005); a bypass circulation path (006) is connected between an inlet of a low-temperature circulating pump (001) to be tested and an outlet of a supercooling heat exchanger (002), a bottom port of a constant pressure tank (007) is connected with the inlet of the low-temperature circulating pump (001) to be tested, a heater (014) is arranged on the outer side of the constant pressure tank (007), a heat balance heat exchanger (011) is arranged in the constant pressure tank (007), an exhaust port of the saturated liquid pool (008) is connected with the inlet of the heat balance heat exchanger (011), and an exhaust port of the heat balance heat exchanger (011), an exhaust port of the constant pressure tank (007) and an exhaust port of a cooling target path (003) are connected with the inlet of a recovery system (200) outside a vacuum chamber; the saturated liquid pool (008) and the constant pressure tank (007) are respectively connected with a medium supply system (100) outside the vacuum chamber (015); a flowmeter is installed in the main path of the cooling target path (003).