CN201149570Y - Freezing and thawing cycle testing machine - Google Patents

Freezing and thawing cycle testing machine Download PDF

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Publication number
CN201149570Y
CN201149570Y CNU2008200784127U CN200820078412U CN201149570Y CN 201149570 Y CN201149570 Y CN 201149570Y CN U2008200784127 U CNU2008200784127 U CN U2008200784127U CN 200820078412 U CN200820078412 U CN 200820078412U CN 201149570 Y CN201149570 Y CN 201149570Y
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heat exchanger
cold
energy accumulator
exchangers
heat
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CNU2008200784127U
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陆国卫
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Abstract

The utility model discloses a freeze thawing cycle testing machine, including cold and hot exchange set, test piece case and controlling means, controlling means is connected and controls their operation with cold and hot exchange group and test piece case respectively, still includes energy storage device in cold and hot exchange group, and energy storage device connects between plate heat exchanger and fan heat exchanger in cold and hot exchange group. The energy storage device is used for storing a part of energy which needs to be discarded in the previous refrigeration or heating process of the test piece box, and the stored energy is released in the next corresponding heating or refrigeration process, so that the speed of the heating or refrigeration process is improved, a large amount of waste energy is recycled, the energy consumption is reduced, the working efficiency is improved, the temperature rising and falling speed is ensured, the noise is low, the working environment adaptability is strong, and the energy storage device is suitable for being used in various test places and natural temperature environments.

Description

The freezing and thawing test machine
Technical field
The utility model relates to a kind of testing equipment, particularly a kind of freezing and thawing test machine with snap frozen, thawing.
Background technology
When the freezing and thawing test machine is experimental material stability and permanance, a kind of test machine that quick simulated environment changes.It often is used in building and the material science, and the various materials that use under the situation of manual simulation's environment temperature lifting, are carried out the security performance and the durability performance check of material.Generally do single test, equipment needs long-time continuous running about 30 days.At present, the various freezing and thawing test machines that use, type of heating all adopts the electrothermal tube heating, it is simple in structure, easy to use, but exist thermal conversion efficiency low, the equipment of 28 concrete sample configurations of general standard needs the above power of 10KW could satisfy the requirement that is rapidly heated at least, and, also there is the danger of electric leakage in the electrothermal tube heating, has increased the risk factor of testing machine use.And the mode of refrigeration all adopts compressor cooling, the heat that compressor produced during refrigeration, the main dual mode that adopts discharges, a kind of use fan type heat exchanger formula heat interchanger discharging, utilizing the force air formula to flow dispels the heat, in this fan type heat exchanger formula heat interchanger discharges heat process, influenced by environmental temperature, in summer, especially under the situation of temperature more than 30 ℃, the compression mechanism cold efficiency reduces greatly, and producer has to increase the power of fan type heat exchanger and compressor in design, and this has not only wasted power supply, also increased the noise emissions of testing laboratory, and, cause the result who to have error because the variation of ambient air temperature has produced labile factor to test.Another kind is to use the water-cooled discharges heat, promptly dispels the heat with cooling tower, though more satisfactory with the effect of cooling tower heat radiation, whole cooling system structure design is complicated, maintenance cost is high, gradually by each manufacturer's natural selection.How to address these problems, reduce to detect the detection cost of unit, the required environment of analog detection that again can fast and stable detects various building materials securities and permanance simultaneously, and improving the national project quality is that the utility model need solve.
Summary of the invention
In view of above-mentioned deficiency of the prior art, the utility model aims to provide a kind of energy-conservation, efficient, stable and safe freezing and thawing test machine.
The utility model is achieved through the following technical solutions:
A kind of freezing and thawing test machine; comprise cold and hot group of switches; test specimen case and control device; cold and hot group of switches comprises coolant compressor; the fan type heat exchanger; heat-exchangers of the plate type and pressure protective device; the coolant compressor high pressure port is communicated with heat-exchangers of the plate type after passing the fan type heat exchanger by pipeline; and get back to the coolant compressor from low pressure port; pressure protective device is connected between coolant compressor high-pressure mouth and the low pressure port; be connected with airtight circulation passage between test specimen case and the heat-exchangers of the plate type; passage is provided with centrifugal ebullator; control device is connected with the test specimen case with cold and hot group of switches respectively; also comprise energy storing device in the cold and hot group of switches, energy storing device is connected in the cold and hot group of switches between the heat-exchangers of the plate type and fan type heat exchanger.
Described energy storing device comprises energy accumulator, two fluid reservoirs, two operation valve groups and a four-way valve, two operation valve groups are connected respectively in the outlet of two fluid reservoirs, two interlock cross connection mutually between the outlet of operation valve group then and the fluid reservoir import, cross-coupled operation valve group and fluid reservoir are connected between heat-exchangers of the plate type and the energy accumulator, another interface on the energy accumulator is connected on the interface of fan type heat exchanger, another interface on the fan type heat exchanger is communicated with four-way valve, also be connected with heat-exchangers of the plate type interface and coolant compressor high-pressure mouth and low pressure port on the four-way valve respectively, four-way valve is connected with control device by lead.
Also be provided with interface channel between two interfaces on the described energy accumulator, be connected with single-way flow restricting valve on the passage.
Described operation valve group comprises expansion valve, retaining valve and the filtrator of order connection successively, and filtrator is connected in the fluid reservoir outlet.
Described energy accumulator comprises cavity, heat exchanger and energy accumulator ebullator, described cavity periphery is provided with insulation material, be placed with ethylene glycol in the cavity, heat exchanger and energy accumulator ebullator are arranged in ethylene glycol, an interface on the heat exchanger is communicated with an end of cross-coupled operation valve group and fluid reservoir, and another interface is communicated with an interface of fan type heat exchanger; Described energy accumulator ebullator is connected with control device by lead.
Described heat exchanger is the snake pipe heat exchanger.
Freezing and thawing test machine described in the utility model, a part of waste heat of required discharging stores when utilizing energy accumulator to do refrigeration work for the test specimen case in the past, and in the time need doing heating work, the heat of storing is effectively discharged for the test specimen case, thereby improve the speed of heating process, and the energy accumulator after the release heat can drop to low-temperature condition simultaneously, when needs are lowered the temperature for the test specimen case once more, utilize the low-temperature condition of energy accumulator, to carrying out reducing temperature twice, reach cold-producing medium fast cooling purpose through the cold-producing medium after the cooling of fan type heat exchanger.Freezing and thawing test machine described in the utility model has not only reclaimed, has utilized a large amount of discarded energy, reduced energy resource consumption, improved work efficiency, and have that warming and cooling rate is fast, noise is little, working environment adaptability is strong, no matter be hot summer or in winter of cold, equipment can both efficient stable operation, be adapted at the natural temperature environment work down in one's power of various testing field.
Description of drawings
Fig. 1 is a structural representation sketch of the present utility model;
Fig. 2 flows to synoptic diagram for cold and hot group of switches internal refrigeration storage agent in the heating process;
Fig. 3 flows to synoptic diagram for cold and hot group of switches internal refrigeration storage agent in the process of refrigerastion.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described:
As shown in Figure 1, freezing and thawing test machine described in the utility model comprises cold and hot group of switches 26, test specimen case 1 and control device 3.
Wherein cold and hot group of switches 26 comprises coolant compressor 6, heat-exchangers of the plate type 22, fan type heat exchanger 9, pressure protective device 4 and energy storing device.Coolant compressor 6, heat-exchangers of the plate type 22, fan type heat exchanger 9 and energy storing device are separately fixed on the base of cold and hot group of switches 26 casings; two interfaces of pressure protective device 4 are connected on coolant compressor high-pressure mouth 7 and the low pressure port 5; monitoring the pressure at coolant compressor 6 two ends; and pressure signal is converted to electric signal passes to control device 3 by lead, adjust and control coolant compressor 6 safe and reliable operations at any time by control device 3.
Two groups of pipelines of isolating fully and being close to are arranged in the heat-exchangers of the plate type 22, be filled with ethylene glycol in the pipeline, wherein be connected with airtight circulation passage 25 between one group and the test specimen case 1, circulation passage 25 is provided with centrifugal ebullator 2, and centrifugal ebullator 2 drives ethylene glycol reciprocation cycle in heat-exchangers of the plate type 22 and test specimen case 1.Coolant compressor 6, fan type heat exchanger 9, centrifugal ebullator 2 and test specimen case 1 are connected with control device 3 respectively by lead.
Energy storing device comprises energy accumulator 21, two fluid reservoirs, two operation valve groups and a four-way valve 8.Energy accumulator 21 is made up of cavity 16, snake pipe heat exchanger 17 and energy accumulator ebullator 18, and cavity 16 peripheries are provided with insulation material 15, are placed with ethylene glycol in the cavity 16, and cavity 16 is fixed on the base of cold and hot group of switches 26 casings.Snake pipe heat exchanger 17 and energy accumulator ebullator 18 all are placed in the ethylene glycol, snake pipe heat exchanger 17 is provided with first interface 14 and second interface 13, energy accumulator ebullator 18 is connected with control device 3, and energy accumulator ebullator 18 can drive ethylene glycol in the cavity 16 and do and circulate.Two operation valve groups are respectively the first operation valve group 19 and 20, two fluid reservoirs of the second operation valve group are first fluid reservoir 10 and second fluid reservoir 11.The first operation valve group 19 and the second operation valve group 20 are respectively by the expansion valve that is communicated with in proper order successively, retaining valve and filtrator are formed, the other end of two filtrators is connected with the outlet of first fluid reservoir 10 and second fluid reservoir 11 respectively, parallel with one another and two ends cross connection between the interconnective first operation valve group 19 and first fluid reservoir 10 and the interconnective second operation valve group 20 and second fluid reservoir 11, the operation valve group after the parallel connection and the two ends of fluid reservoir are connected between heat-exchangers of the plate type 22 and the energy accumulator 21, promptly respectively with heat-exchangers of the plate type 22 on second port 23 and energy accumulator 21 in first interface 14 on the snake pipe heat exchanger 17 be connected, thereby make the two cover operation valve groups and the fluid reservoir of the parallel connection that is connected between heat-exchangers of the plate type 22 and the energy accumulator 21 can only remain folk prescription to conducting.First port 24 on the high pressure port 7 of coolant compressor, low-pressure port 5 and the heat-exchangers of the plate type and second interface 13 on the snake pipe heat exchanger are connected on the four-way valve 8 by pipeline respectively, wherein are connected pipeline on snake pipe heat exchanger second interface 13 and pass fan type heat exchanger 9 backs and be communicated with four-way valve 8.Four-way valve 8 is connected with control device 3 by lead itself, and opening or close corresponding valve on the four-way valve 8 under the control of control device 3, connects different pipe passages.
In order to improve the refrigerating efficiency in the whole process of refrigerastion of freezing and thawing test machine, make full use of the function of energy accumulator, also be provided with an interface channel between two inlet and outlet connectors on the snake pipe heat exchanger 17, passage is provided with single-way flow restricting valve 12, the flow of the cold-producing medium that snake pipe heat exchanger 17 lowers the temperature is flow through in control, and the energy of energy accumulator 21 can effectively be discharged for a long time.
When needs heated the test specimen case, as shown in Figure 2, the direction of arrow was cold-producing medium direction of motion among the figure.Four-way valve 8 is connected respective channel under the control of control device 3, coolant compressor 6 starts, coolant compressor 6 discharges from high-pressure mouth 7 after cold-producing medium is pressed into gases at high pressure, enter the heat-exchangers of the plate type 22 from first port 24 through four-way valve 8 and connecting tube, refrigerant condenses under the hyperbaric environment becomes liquid state to discharge a large amount of heats simultaneously, after after cold-producing medium enters heat-exchangers of the plate type 22, isolating fully and being close to ducted ethylene glycol and carrying out heat interchange with another group, making another organize ducted ethylene glycol temperature raises, under the effect of ebullator 2, ethylene glycol after the intensification circulates between heat-exchangers of the plate type 22 and test specimen case 1, again with test specimen case 1 in test material carry out heat interchange, thereby finish test material heating process in the test specimen case 1.Flow out and be cooled and condense into second port 23 of liquid cold-producing medium on heat-exchangers of the plate type 22, enter and also fully condense into liquid state in second fluid reservoir 11, enter in the low-pressure side pipeline through the second operation valve group 20, cold-producing medium will volatilize under low-pressure state and need to absorb very big heat.Cold-producing medium in the volatilization process enters in the snake pipe heat exchanger 17 by first interface 14, under the effect of energy accumulator ebullator 18 with cavity 16 in ethylene glycol carry out exchange heat, the ethylene glycol temperature is reduced, cold-producing medium after the volatilization flows out snake pipe heat exchanger 17 from second interface 13, enter fan type heat exchanger 9 and the cold-producing medium that does not volatilize is fully volatilized fully, cold-producing medium after the volatilization flow back into the coolant compressor 6 from four-way valve 8 and coolant compressor low pressure port 5 fully, be compressed into high-pressure gas refrigerant once more through coolant compressor 6, working in reciprocating mode like this, test material reaches till the temperature of setting in test specimen case 1, just finishes whole heating process to test specimen case 1.The discarded energy that heating process produces then is stored in the ethylene glycol in the energy accumulator cavity 16, and the ethylene glycol in the energy accumulator cavity 16 are reduced to low-temperature condition.Arrive the temperature of setting when test material after, because the demand of test code needs lower the temperature to test material, this timed unit 3 sends instruction makes cold and hot group of switches 26 switch to the refrigeration connection status at once.
When test specimen case 1 is lowered the temperature, as shown in Figure 3, the direction of arrow is cold-producing medium direction of motion among the figure, control device 3 control four-way valves 8 are connected respective channels, after high pressure, high temperature refrigerant is come out from coolant compressor high pressure port 7, flow to fan type heat exchanger 9 through four-way valve 8, fan type heat exchanger 9 is at first lowered the temperature for the first time to the high pressure, high temperature refrigerant in the pipeline, and cold-producing medium begins to be cooled and begins to condense into liquid state.But work as in extremely hot summer, temperature is higher than under 30 ℃ the environment, the heat exchange efficiency of fan type heat exchanger 9 reduces greatly, can not refrigerant cools be condensed, the single-way flow restricting valve 12 of a part of so cooled cold-producing medium on interface channel between first interface 14 on the snake pipe heat exchanger and second interface 13 flows through, another part then enters into snake pipe heat exchanger 17, carry out heat interchange with the cryogenic energy of in cavity 16, storing in the ethylene glycol in the heating process, take away the cryogenic energy of storing in the ethylene glycol, make this part cold-producing medium that enters in the snake pipe heat exchanger 17 condense into liquid state fully, cold-producing medium after the cooling and the cold-producing medium that flows through from single-way flow restricting valve 12 abundant condensation by mixing first fluid reservoir 10, filtrator in the first operation valve group 19, retaining valve and expansion valve enter into heat-exchangers of the plate type 22, first port 24 that this moment, four-way valve 8 switched to heat-exchangers of the plate type 22 under the effect of control device 3 is communicated with coolant compressor low pressure port 5 through four-way valve 8, under the effect of coolant compressor 6 and under the control of the first operation valve group 19, refrigerant tubing in the heat-exchangers of the plate type 22 has become low-pressure state, high-pressure refrigerant enters into heat-exchangers of the plate type 22 from second port 23 and can take place to volatilize to become gaseous state, absorb a large amount of heats simultaneously, be arranged in another group and isolate fully and be close to ducted ethylene glycol temperature fast cooling and make, under the effect of centrifugal ebullator 2, ethylene glycol circulates between heat-exchangers of the plate type 22 and test specimen case 1, test material temperature in the test specimen case 1 is reduced, thereby finish temperature-fall period test material in the test specimen case 1.And after the cold-producing medium that has volatilized in the heat-exchangers of the plate type 22 flows out by first port 24, flow back into the coolant compressor 6 from coolant compressor low pressure port 5 through four-way valve 8, be compressed into high-pressure gas refrigerant through coolant compressor 6 again, working in reciprocating mode is until finishing whole process of refrigerastion to test specimen case 1 like this.
Because the existence of energy storing device, when whole unit is done energy conversion, no matter be that test specimen case 1 is done heating work or test specimen case 1 is done refrigeration work, cold-producing medium can both absorb heat or discharges heat fast, got rid of the efficient that influences cold and hot group of switches 26 energy conversion because of the physical environment variation of temperature, make the cold and hot conversion efficiency of cold and hot group of switches 26 remain at optimum condition, can fully satisfy the use needs under varying environment.

Claims (6)

1, a kind of freezing and thawing test machine, comprise cold and hot group of switches, test specimen case and control device, described cold and hot group of switches comprises coolant compressor, fan type heat exchanger, heat-exchangers of the plate type and pressure protective device, the coolant compressor high pressure port is communicated with heat-exchangers of the plate type after passing the fan type heat exchanger by pipeline, and get back to the coolant compressor from low pressure port, pressure protective device is connected between coolant compressor high-pressure mouth and the low pressure port; Be connected with airtight circulation passage between described test specimen case and the heat-exchangers of the plate type, passage is provided with centrifugal ebullator; Described control device is connected with the test specimen case with cold and hot group of switches respectively, it is characterized in that, also comprise energy storing device in the described cold and hot group of switches, described energy storing device is connected in the cold and hot group of switches between the heat-exchangers of the plate type and fan type heat exchanger.
2, freezing and thawing test machine according to claim 1, it is characterized in that, described energy storing device comprises energy accumulator, two fluid reservoirs, two operation valve groups and a four-way valve, described two operation valve groups are connected respectively in the outlet of two fluid reservoirs, two interlock cross connection mutually between the outlet of operation valve group then and the fluid reservoir import, cross-coupled operation valve group and fluid reservoir are connected between heat-exchangers of the plate type and the energy accumulator, another interface on the energy accumulator is connected on the interface of fan type heat exchanger, another interface on the fan type heat exchanger is communicated with four-way valve, also be connected with heat-exchangers of the plate type interface and coolant compressor high-pressure mouth and low pressure port on the four-way valve respectively, four-way valve is connected with control device by lead.
3, freezing and thawing test machine according to claim 2 is characterized in that, also is provided with interface channel between two interfaces on the described energy accumulator, is connected with single-way flow restricting valve on the passage.
According to claim 2 or 3 described freezing and thawing test machines, it is characterized in that 4, described operation valve group comprises expansion valve, retaining valve and the filtrator of order connection successively, filtrator is connected in the fluid reservoir outlet.
5, according to claim 2 or 3 described freezing and thawing test machines, it is characterized in that, described energy accumulator comprises cavity, heat exchanger and energy accumulator ebullator, described cavity periphery is provided with insulation material, be placed with ethylene glycol in the cavity, heat exchanger and energy accumulator ebullator are arranged in ethylene glycol, and an interface on the heat exchanger is communicated with an end of cross-coupled operation valve group and fluid reservoir, and another interface is communicated with an interface of fan type heat exchanger; Described energy accumulator ebullator is connected with control device by lead.
6, freezing and thawing test machine according to claim 5 is characterized in that, described heat exchanger is the snake pipe heat exchanger.
CNU2008200784127U 2008-01-03 2008-01-03 Freezing and thawing cycle testing machine Expired - Fee Related CN201149570Y (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101923085A (en) * 2010-07-06 2010-12-22 中交第二公路勘察设计研究院有限公司 Multifunctional road soil roadbed freezing and thawing circulating test device
CN103063697A (en) * 2012-12-28 2013-04-24 苏州市东华试验仪器有限公司 Freezing-thawing test machine with blowdown device
CN103196753A (en) * 2013-03-18 2013-07-10 长江水利委员会长江科学院 Unidirectional freezing freeze-thaw cycle triaxial apparatus and test method thereof
CN103575758A (en) * 2012-07-24 2014-02-12 李健 Freeze-thaw cycle testing machine
CN104964994A (en) * 2015-07-16 2015-10-07 中国水利水电科学研究院 Two-box asynchronous concrete freezing-thawing test device and test method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101923085A (en) * 2010-07-06 2010-12-22 中交第二公路勘察设计研究院有限公司 Multifunctional road soil roadbed freezing and thawing circulating test device
CN101923085B (en) * 2010-07-06 2013-07-31 中交第二公路勘察设计研究院有限公司 Multifunctional road soil roadbed freezing and thawing circulating test device
CN103575758A (en) * 2012-07-24 2014-02-12 李健 Freeze-thaw cycle testing machine
CN103063697A (en) * 2012-12-28 2013-04-24 苏州市东华试验仪器有限公司 Freezing-thawing test machine with blowdown device
CN103196753A (en) * 2013-03-18 2013-07-10 长江水利委员会长江科学院 Unidirectional freezing freeze-thaw cycle triaxial apparatus and test method thereof
CN104964994A (en) * 2015-07-16 2015-10-07 中国水利水电科学研究院 Two-box asynchronous concrete freezing-thawing test device and test method
CN104964994B (en) * 2015-07-16 2018-07-20 中国水利水电科学研究院 Double case asynchronous system concrete freezing-thawing test devices and test method

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Granted publication date: 20081112

Termination date: 20110103