阅读说明：本技术 单管管内沸腾实验装置 (Single-tube in-tube boiling experimental device ) 是由 谢晶 常婉莹 王金锋 滕文强 朱生林 于 2019-10-14 设计创作，主要内容包括：本发明涉及一种单管管内沸腾实验装置,包括：实验段水循环系统、制冷剂循环系统、预冷处理循环回路、冷凝处理循环回路和过冷处理循环回路以及实验数据采集控制系统。本发明在进行沸腾实验时,制冷剂循环回路上并联装有第一电磁流量计(G1)和第二电磁流量计(G2),可以精确测量制冷剂流量大小的变化,实验段(5)前的第一电子膨胀阀(EXV1)和实验段(5)后的第二电子膨胀阀(EXV2)均可控制制冷剂的压力。实验数据采集控制系统操作简单易上手,界面简洁,方便快捷。(The invention relates to a single-tube in-tube boiling experimental device, which comprises: the system comprises an experiment section water circulation system, a refrigerant circulation system, a precooling treatment circulation loop, a condensation treatment circulation loop, a supercooling treatment circulation loop and an experiment data acquisition control system. When the invention is used for boiling experiments, a first electromagnetic flow meter (G1) and a second electromagnetic flow meter (G2) are connected in parallel on a refrigerant circulating loop, so that the change of the refrigerant flow can be accurately measured, and the pressure of the refrigerant can be controlled by both a first electronic expansion valve (EXV 1) in front of an experimental section (5) and a second electronic expansion valve (EXV 2) behind the experimental section (5). The experiment data acquisition control system is simple to operate and easy to operate, and has a simple interface, convenience and rapidness.)

1. Boiling experimental apparatus in single tube, its characterized in that includes: the system comprises an experiment section water circulation system, a refrigerant circulation system, a precooling treatment circulation loop, a condensation treatment circulation loop, a supercooling treatment circulation loop and an experiment data acquisition control system;

the refrigerant circulating system is formed by sequentially connecting a liquid storage device (1), a drying filter (2), a subcooler (3), a pulsation damper (4), a diaphragm metering pump (B3), a first electromagnetic flow meter (G1), a second electromagnetic flow meter (G2), a first liquid sight glass (S1), a second liquid sight glass (S2), a third liquid sight glass (S3), a fourth liquid sight glass (S4), a second plate heat exchanger (HE 2), an experimental section (HE) and a third plate heat exchanger (HE 3) into a loop;

the experimental section (5) adopts a sleeve type structure, and the sleeve type structure comprises: the refrigerant-free heat exchanger comprises an inner pipe and an outer pipe, wherein the inner pipe is a copper pipe, the outer pipe is a stainless steel pipe, a sleeve is arranged between the inner pipe and the outer pipe, the inner pipe is a heat exchange pipe, and a refrigerant flows in the inner pipe;

the experimental section water circulation system consists of a third electromagnetic flowmeter (G3), a testing electric heating water tank (H1), a plate heat exchanger (HE 1), an expansion water tank (E) and a testing water pump (B1), and the three are sequentially connected into a loop;

the supercooling treatment circulation loop consists of a subcooler (3), a glycol low-temperature water tank (6), a water chilling unit (C), a Y-shaped filter (7) and a low-temperature circulating water pump (B2), and the subcooled treatment circulation loop and the cold water tank are sequentially connected into a loop;

the ethylene glycol low-temperature water tank (6) and the water chilling unit (C) provide energy for the whole experiment system;

the experimental data acquisition control system measures and controls the water circulation system, the refrigerant circulation system, the precooling treatment circulation loop, the condensing treatment circulation loop and the supercooling treatment circulation loop in the experimental section.

2. The single-tube boiling experimental apparatus of claim 1, wherein:

the pre-cooling treatment circulation loop comprises: the second plate heat exchanger (HE 2), the fifth electromagnetic flowmeter (G5), the ethylene glycol low-temperature water tank (6), the water chilling unit (C), the Y-shaped filter (7) and the low-temperature circulating water pump (B2) are sequentially connected into a loop;

the pre-cooling treatment circulation loop provides cold energy for the refrigerant in the second plate heat exchanger (HE 2), and the saturation of the refrigerant at the inlet of the experimental section is controlled to enable the refrigerant to be in a saturated liquid state.

3. The single-tube boiling experimental apparatus of claim 1, wherein:

the condensate treatment circulation loop comprises: a third plate heat exchanger (HE 3), a fourth electromagnetic flowmeter (G4), a glycol low-temperature water tank (6), a water chilling unit (C), a Y-shaped filter (7) and a low-temperature circulating water pump (B2) which are connected in sequence to form a loop;

the condensation treatment circulation loop provides cold for heat exchange of the refrigerant in the third plate heat exchanger (HE 3), and the refrigerant is condensed into saturated liquid in the condensation treatment circulation loop.

4. The single-tube boiling experimental apparatus of claim 1, wherein: the first liquid observation mirror (S1), the second liquid observation mirror (S2), the third liquid observation mirror (S3) and the fourth liquid observation mirror (S4) can observe the flow state of the refrigerant;

ensuring that the refrigerant is in a full liquid state when flowing through the first sight glass (S1) through the experimental data acquisition control system; the refrigerant is in a full liquid state when flowing through the second liquid sight glass (S2); the refrigerant is in a full liquid state when flowing through the third sight glass (S3); the refrigerant is in a full gas state, i.e., in a saturated vapor state, while passing through the fourth sight glass (S4).

5. The single-tube boiling experimental apparatus of claim 1, wherein: the subcooler (3) is positioned in front of the diaphragm metering pump (B3) to ensure that the refrigerant entering the diaphragm metering pump (B3) is kept in a subcooled state, and flash steam is prevented from being generated when the refrigerant passes through an inlet valve bank and an outlet valve bank of the diaphragm metering pump (B3).

6. The single-tube boiling experimental apparatus of claim 1, wherein: the precooling treatment circulation loop, the precooling treatment circulation loop and the supercooling treatment circulation loop share the same ethylene glycol low-temperature water tank (6), the water chilling unit (C), the Y-shaped filter (7) and the low-temperature circulating water pump (B2), so that the cost of experimental equipment is reduced, the floor area of an experimental device is reduced, and the experimental operation is convenient and fast.

7. The single-tube boiling experimental apparatus of claim 1, wherein: and the liquid storage device (1) is provided with a liquid storage device upper liquid sight glass (S5) and a liquid storage device lower liquid sight glass (S6) and is used for observing the liquid level of the refrigerant in the liquid storage device (1).

8. The single-tube boiling experimental apparatus of claim 1, wherein: the pulsation damper (4) eliminates pulsation of the refrigerant, reducing fluctuation in data acquisition.

9. The single-tube boiling experimental apparatus of claim 1, wherein: in the experimental section water circulation system, the experimental section inlet water temperature is controlled by the electric heating water tank (H1), the electric heating water tank (H1) is provided with a power regulator for regulation, and the experimental section inlet temperature is measured by a third platinum resistor (T3); power is provided by a test water pump (B1).

10. The single tube internal boiling experimental apparatus of claims 2 and 3, wherein: the ethylene glycol low-temperature water tank (6) is internally provided with an electric heater (H2) with a power regulator, so that the operation of temperature regulation is convenient.

Technical Field

The invention relates to a boiling experimental device, in particular to a single-tube internal boiling experimental device.

Background

The efficient and compact heat exchanger has good energy-saving effect in refrigeration and air conditioning systems, and in recent years, research on the heat exchange characteristics, pressure drop characteristics and boiling heat exchange coefficient of the efficient heat exchange tube has become a hot point, so that an approach and a device are needed for experimental research to verify the design and provide reference and necessary means for the design of the boiling heat exchanger.

Disclosure of Invention

The invention aims to provide a boiling experimental device in a single pipe and provide reference for carrying out boiling heat exchange experiments later.

In order to achieve the purpose, the technical scheme of the invention is as follows: a boiling experimental facility in a single tube, comprising: the system comprises an experiment section water circulation system, a refrigerant circulation system, a precooling treatment circulation loop, a condensation treatment circulation loop, a supercooling treatment circulation loop and an experiment data acquisition control system; the refrigerant circulating system is formed by sequentially connecting a liquid storage device 1, a drying filter 2, a subcooler 3, a pulsation damper 4, a diaphragm metering pump B3, a first electromagnetic flow meter G1, a second electromagnetic flow meter G2, a first liquid sight glass S1, a second liquid sight glass S2, a third liquid sight glass S3, a fourth liquid sight glass S4, a second plate heat exchanger HE2, an experimental section 5 and a third plate heat exchanger HE3 into a loop; experiment section 5 adopts bushing type structure, and bushing type structure includes: the refrigerant flows in the inner pipe, the inner pipe is a copper pipe, the outer pipe is a stainless steel pipe, a sleeve is arranged between the inner pipe and the outer pipe, the inner pipe is a heat exchange pipe; the experiment section water circulation system consists of a third electromagnetic flowmeter G3, a test electric heating water tank H1, a plate heat exchanger HE1, an expansion water tank E and a test water pump B1 which are sequentially connected into a loop; the supercooling treatment circulation loop consists of a subcooler 3, a glycol low-temperature water tank 6, a water chilling unit C, Y type filter 7 and a low-temperature circulating water pump B2, and the subcooler, the glycol low-temperature water tank and the water chilling unit C, Y type filter are sequentially connected into a loop; the ethylene glycol low-temperature water tank 6 and the water chilling unit C provide energy for the whole experiment system; and the experiment data acquisition control system is used for measuring and controlling the experiment section water circulation system, the refrigerant circulation system, the precooling treatment circulation loop, the condensation treatment circulation loop and the supercooling treatment circulation loop.

The pre-cooling treatment circulation loop comprises: the second plate heat exchanger HE2, the fifth electromagnetic flowmeter G5, the ethylene glycol low-temperature water tank 6, the water chilling unit C, Y type filter 7 and the low-temperature circulating water pump B2 are sequentially connected into a loop, the precooling treatment circulating loop provides cold energy for the refrigerant in the second plate heat exchanger HE2, and the saturation of the refrigerant at the inlet of the experimental section is controlled, so that the refrigerant is in a saturated liquid state.

The condensation treatment circulation loop comprises: the third plate heat exchanger HE3, the fourth electromagnetic flowmeter G4, the ethylene glycol low-temperature water tank 6, the water chilling unit C, Y type filter 7 and the low-temperature circulating water pump B2 are sequentially connected into a loop, the condensation treatment circulating loop provides cold energy for heat exchange of the refrigerant in the third plate heat exchanger HE3, and the refrigerant is condensed into saturated liquid in the condensation treatment circulating loop.

The flow state of the refrigerant can be observed by the first liquid sight glass S1, the second liquid sight glass S2, the third liquid sight glass S3 and the fourth liquid sight glass S4, and the refrigerant is ensured to be in a full liquid state when flowing through the first liquid sight glass S1 through an experimental data acquisition control system; the refrigerant is in a full liquid state when flowing through the second liquid sight glass S2; the refrigerant is in a full liquid state when flowing through the third sight glass S3; the refrigerant is in an all-gas state, i.e., in a saturated vapor state, while flowing through the fourth sight glass S4.

The subcooler 3 is positioned in front of the diaphragm metering pump B3, so that the refrigerant entering the diaphragm metering pump B3 is ensured to be kept in a subcooled state, and flash steam is prevented from being generated when the refrigerant passes through an inlet-outlet valve bank of the diaphragm metering pump B3.

The precooling treatment circulation loop, the condensing treatment circulation loop and the supercooling treatment circulation loop share the same ethylene glycol low-temperature water tank 6, the water chilling unit C, Y type filter 7 and the low-temperature circulating water pump B2, so that the cost of experimental equipment is reduced, the floor area of an experimental device is reduced, and the experimental operation is convenient.

An accumulator upper sight glass S5 and an accumulator lower sight glass S6 are arranged on the accumulator 1 and used for observing the liquid level of the refrigerant in the accumulator 1.

The pulsation damper 4 can eliminate pulsation of the refrigerant and reduce fluctuation of data acquisition.

In the experiment section water circulation system, the temperature of the water at the inlet of the experiment section is controlled by an electric heating water tank H1, the electric heating water tank H1 is provided with a power regulator for regulation, and the temperature at the inlet of the experiment section is measured by a third platinum resistor T3; power is provided by test water pump B1.

The ethylene glycol low-temperature water tank 6 is internally provided with an electric heater H2 with a power regulator, so that the operation of regulating the temperature is convenient.

The invention has the beneficial effects that: the invention solves the problem of measuring the boiling heat transfer coefficient in the copper pipe, the device can control the pressure and the temperature of the refrigerant through the electronic expansion valve during the experiment, the experiment can be carried out in various states, and the device also has the advantages of simple operation, easy operation, simple interface, convenience and quickness of an experiment data acquisition control system.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention, in which 1-reservoir, 2-dry filter, 3-subcooler, 4-pulsation damper, 5-experimental section, 6-glycol low-temperature water tank, C-chiller, 7-Y type filter, E-expansion water tank, HE 1-first plate heat exchanger, HE 2-second plate heat exchanger, HE 3-third plate heat exchanger, EXV 1-first electronic expansion valve, EXV 2-second electronic expansion valve, S1-first sight glass, S2-second sight glass, S3-third sight glass, S4-fourth sight glass, S5-reservoir upper sight glass, S6-reservoir lower sight glass, H1-test electric heating, H2-electric heating, B1-test water pump, B2-low-temperature circulating water pump, b3-diaphragm metering pump, P1-first pressure sensor, P2-second pressure sensor, P3-third pressure sensor, Δ P1-first differential pressure sensor, Δ P2-second differential pressure sensor, G1-first electromagnetic flowmeter, G2-second electromagnetic flowmeter, G3-third electromagnetic flowmeter, G4-fourth electromagnetic flowmeter, G5-fifth electromagnetic flowmeter, T1-first platinum resistor, T2-second platinum resistor, T3-third platinum resistor, T4-fourth platinum resistor, T5-fifth platinum resistor, T6-sixth platinum resistor, T7-seventh platinum resistor, T8-eighth platinum resistor, T9-ninth platinum resistor, T10-tenth platinum resistor, T11-eleventh platinum resistor, T12-twelfth platinum resistor, T13-thirteenth platinum resistor, t14-fourteenth platinum resistor, VW 1-first ball valve, VW 2-second ball valve, VW 3-third ball valve, VW 4-fourth ball valve, VW 5-fifth ball valve, VW 6-sixth ball valve, VW 7-seventh ball valve, VW 8-eighth ball valve, VW 9-ninth ball valve, VW 10-tenth ball valve, VR 1-first stop valve, VR 2-second stop valve, VR 3-third stop valve, VR 4-fourth stop valve, VR 5-fifth stop valve, VR 6-sixth stop valve, VR 7-seventh stop valve, VR 8-eighth stop valve, VR 9-ninth stop valve, VR 10-tenth stop valve, VR 11-eleventh stop valve, VR 12-twelfth stop valve, VR 13-reservoir safety valve.

Detailed Description

The following describes the method of using the present invention in detail by taking specific embodiments as examples with reference to the accompanying drawings.

FIG. 1 is a system schematic of the present invention. As shown in fig. 1, a single tube boiling experimental apparatus comprises: the device comprises a liquid storage device 1, a drying filter 2, a subcooler 3, a diaphragm metering pump B3, a pulsation damper 4, a first electromagnetic flow meter G1, a second electromagnetic flow meter G2, a third electromagnetic flow meter G3, a fourth electromagnetic flow meter G4, a fifth electromagnetic flow meter G5, a first liquid observation mirror S1, a second liquid observation mirror S2, a third liquid observation mirror S3, a fourth liquid observation mirror S4, a first plate heat exchanger HE1, a second plate heat exchanger HE2, a third plate heat exchanger HE3, a first electronic expansion valve EXV1, a second electronic expansion valve EXV2, an experimental section 5, a Y-type filter 7, a glycol low-temperature water tank 6 and a cold water unit C.

The main circulation loop comprises: the system comprises an experimental section water circulation loop, a refrigerant circulation loop, a precooling treatment circulation loop, a condensation treatment circulation loop and a supercooling treatment circulation loop.

The refrigerant circulation circuit includes: the system comprises a liquid storage device 1, a drying filter 2, a subcooler 3, a pulsation damper 4, a diaphragm metering pump B3, a first electromagnetic flow meter G1, a second electromagnetic flow meter G2, a first liquid viewing mirror S1, a second liquid viewing mirror S2, a third liquid viewing mirror S3, a fourth liquid viewing mirror S4, a second plate heat exchanger HE2, an experimental section 5 and a third plate heat exchanger HE3 which are sequentially connected into a refrigerant circulation loop.

In the refrigerant circulation loop, the liquid storage device 1 is used for storing liquid condensed after the experiment circulation is finished, and the liquid storage device 1 is provided with a liquid storage device upper liquid sight glass S5 and a liquid storage device lower liquid sight glass S6 and is used for observing the liquid level of refrigerant in the liquid storage device 1.

In the refrigerant circulation circuit, the filter drier 2 can reduce impurities in the refrigerant entering the diaphragm metering pump B3.

In the refrigerant circulation loop, the subcooler 3 is positioned in front of the diaphragm metering pump B3, so that the refrigerant entering the diaphragm metering pump B3 is ensured to be kept in a subcooled state, and flash steam is prevented from being generated when the refrigerant passes through an inlet valve bank and an outlet valve bank of the diaphragm metering pump B3.

In the refrigerant circulation circuit, the pulsation damper 4 can eliminate the pulsation of the refrigerant and reduce the fluctuation of data acquisition.

In the refrigerant circulation loop, the range of the first electromagnetic flow meter G1 is 0-0.6 kg/min, the range of the second electromagnetic flow meter G2 is 0-5 kg/min, and the first electromagnetic flow meter G1 and the second electromagnetic flow meter G2 are switched by opening and closing the fourth stop valve VR4, the fifth stop valve VR5, the sixth stop valve VR6 and the seventh stop valve VR7, so that the measured refrigerant flow data can be ensured to be accurate.

In the refrigerant circulation circuit, the experimental section 5 adopts a sleeve type structure, and the sleeve type structure comprises: the inner pipe is a copper pipe, the outer pipe is a stainless steel pipe, a sleeve is arranged between the inner pipe and the outer pipe, the inner pipe is a heat exchange pipe, and a refrigerant flows in the inner pipe.

The experiment section water circulation loop includes: the test device comprises an electromagnetic flow meter G3, a test electric heating water tank H1, a first plate heat exchanger HE1, an expansion water tank E and a test water pump B1, which are sequentially connected into a test section water circulation loop to provide heat for the boiling test of the test section 5.

In the experimental water circulation loop, the range of the third electromagnetic flowmeter G3 is 0-6.3 m³/h。

In the experimental section water circulation loop, the model of the first plate heat exchanger HE1 is CB 30-22H-F.

In the experiment section water circulation loop, the test water pump B1 is a water pump with a frequency converter, and the water flow can be adjusted.

The pre-cooling treatment circulation loop comprises: the second plate heat exchanger HE2, the fifth electromagnetic flowmeter G5, the ethylene glycol low-temperature water tank 6, the water chilling unit C, Y type filter 7 and the low-temperature circulating water pump B2 are sequentially connected to form a pre-cooling treatment circulating loop, the pre-cooling treatment circulating loop provides cold energy for the refrigerant in the second plate heat exchanger HE2, and the saturation of the refrigerant at the inlet of the experimental section is controlled, so that the refrigerant is in a saturated liquid state.

In the pre-cooling treatment circulation loop, the second plate heat exchanger HE2 is ACH-30EQ-50 HF.

In the pre-cooling treatment circulation circuit, the fifthThe range of the electromagnetic flowmeter G5 is 0-3 m³/h。

In the precooling treatment circulation loop, an electric heater H2 with a power regulator is arranged in the ethylene glycol low-temperature water tank 6, so that the operation of temperature regulation is convenient.

The condensation treatment circulation loop comprises: the third plate heat exchanger HE3, the fourth electromagnetic flowmeter G4, the ethylene glycol low-temperature water tank 6, the water chilling unit C, Y type filter 7 and the low-temperature circulating water pump B2 are sequentially connected into a condensation treatment circulating loop, the condensation treatment circulating loop provides cold energy for heat exchange of a refrigerant in the third plate heat exchanger HE3, and the refrigerant is condensed into saturated liquid in the condensation treatment circulating loop.

In the condensation treatment circulation loop, the third plate heat exchanger HE3 is AC-30EQ-44 HF.

The range of the fourth electromagnetic flowmeter G4 in the condensation treatment circulation loop is 0-6.3 m³/h。

And the supercooling treatment circulating loop consists of a subcooler 3, a glycol low-temperature water tank 6, a water chilling unit C, Y type filter 7 and a low-temperature circulating water pump B2, and is sequentially connected into the supercooling treatment circulating loop.

The experimental data acquisition control system has a simple interface and has the functions of a flow chart, a real-time data trend chart, a control interface, alarm prompting, historical data display and the like.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.