CN112413916B - Cold and hot gas injection device - Google Patents
Cold and hot gas injection device Download PDFInfo
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- CN112413916B CN112413916B CN202011277947.9A CN202011277947A CN112413916B CN 112413916 B CN112413916 B CN 112413916B CN 202011277947 A CN202011277947 A CN 202011277947A CN 112413916 B CN112413916 B CN 112413916B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/06—Compression machines, plants or systems with non-reversible cycle with compressor of jet type, e.g. using liquid under pressure
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Abstract
The application relates to a cold and hot air injection device, which comprises an evaporator assembly, wherein the evaporator assembly comprises a unit evaporator, the unit evaporator comprises an inner pipe and an outer pipe, the outer pipe is sleeved outside the inner pipe, one end of a refrigerant in the inner pipe flows into the outer pipe is an inlet end, one end of the outer pipe is provided with an air inlet, the other end of the outer pipe is provided with an air outlet, the evaporator assembly comprises at least two unit evaporators, the inner pipes of all the unit evaporators are sequentially connected, and the air outlet of the previous unit evaporator is connected with the air inlet of the next unit evaporator; and the throttling components are arranged in the two adjacent unit evaporators and are connected with the inner pipes of the two unit evaporators, and the flow passage area of each throttling component is smaller than that of the inner pipe of the previous unit evaporator. This application has the effect that the low temperature refrigeration capacity that has effectively reduced the evaporimeter is by extravagant volume to can reduce the volume that the consumption increases, reduce cost under the prerequisite of guaranteeing lower minimum temperature, bigger rated flow and bigger temperature transition scope.
Description
Technical Field
The application relates to the field of high-low temperature impact testing equipment, in particular to a cold and hot air injection device.
Background
The cold and hot air injection device is test equipment capable of injecting high and low temperature air flow, the temperature range of the air flow is +200 to-80 ℃, the flow range is 100 to 500L/min, the high and low temperature conversion time of +125 to-55 ℃ is within 20 seconds, and the temperature stabilization time is within 15 seconds, so that the cold and hot air injection device is widely applied to high and low temperature impact tests of electronic parts in the electronic industry. The working principle is that high-pressure dry gas passes through the cold source and the heat source in sequence and is sprayed out from the outlet.
Wherein the cold source comprises an evaporator of a vapor compression type refrigerator and liquid nitrogen. The most common is a two-stage cascade refrigerator, and the refrigeration compressor of the refrigerator is generally a fixed-frequency totally-enclosed compressor. The heat source is generally an industrial heater. When in operation, the refrigerator is operated at full power. The control mode is to control the heating power of the heat source through the PLC, so as to realize the temperature control of the outlet gas. Lower minimum temperatures, higher flow rates and a higher temperature transition range in the same time are now often required for certain applications.
In view of the above-mentioned related art, the inventor believes that although the lower minimum temperature, the larger rated flow rate and the larger temperature conversion range can be solved by increasing the power of the compressor, the disadvantages of increased power consumption, increased cost and increased volume are brought about.
Disclosure of Invention
In order to improve the problems of increased power consumption, increased cost and increased volume caused by ensuring lower minimum temperature, larger rated flow and larger temperature conversion range, the application provides a cold and hot air injection device.
The application provides a cold and hot gas injection apparatus adopts following technical scheme:
a cold and hot air injection device comprises an evaporator assembly, wherein the evaporator assembly comprises a unit evaporator, the unit evaporator comprises an inner pipe and an outer pipe sleeved outside the inner pipe, one end, into which a refrigerant flows, in the inner pipe is an inlet end, one end of the outer pipe is provided with an air inlet, the other end of the outer pipe is provided with an air outlet, the evaporator assembly comprises at least two unit evaporators, the inner pipes of the unit evaporators are sequentially connected, and the air outlet of the previous unit evaporator is connected with the air inlet of the next unit evaporator; and the throttling components are arranged in the two adjacent unit evaporators and are connected with the inner pipes of the two unit evaporators, and the flow passage area of each throttling component is smaller than that of the inner pipe of the previous unit evaporator.
By adopting the technical scheme, the heat transfer refrigerants are all at low temperature in a low-temperature state, and when the heat transfer refrigerants are processed to the low-temperature state, more mechanical energy for refrigeration needs to be consumed, and the lower the temperature is, the higher the mechanical energy needs to be consumed; therefore, low temperature heat transfer requires that the heat transfer temperature difference be as small as possible. When the refrigerant in the former unit evaporator flows through the throttling assembly, the refrigerant flow rate is increased, and the refrigerant pressure is reduced, and the flow rate is kept constant after entering the latter unit evaporator. The boiling point of the refrigerant having the reduced pressure is also lowered, and heat is absorbed during the vaporization of the refrigerant, so that the temperature in the subsequent unit evaporator is lower than that in the previous unit evaporator. It is thus possible to successively lower the pressure and the temperature in the successively arranged unit evaporators. When gas passes through each unit evaporator gradually, the temperature difference between the gas and the unit evaporator through which the gas passes can be kept in a smaller range, and the amount of waste of the low-temperature refrigerating capacity of the evaporator is effectively reduced, so that the amount of power consumption increase is reduced and the cost is reduced on the premise of ensuring lower minimum temperature, larger rated flow and larger temperature conversion range. And effectively improves the problem of the increase of the body volume.
Optionally, the throttling assembly comprises a throttling device for connecting the inner pipes of two adjacent unit evaporators.
By adopting the technical scheme, the throttler can simply connect the inner pipes of the two adjacent unit evaporators, and is convenient to install.
Optionally, the restrictor is an electronic expansion valve or a capillary tube.
Through adopting above-mentioned technical scheme, select for use the capillary as the flow controller, can play the throttle effect. The electronic expansion valve is selected as the restrictor, so that the throttling effect can be achieved, and the electronic expansion valve is easy to adjust.
Optionally, the air inlet on the outer tube is located on one side far away from the inlet end.
Through adopting above-mentioned technical scheme, when letting in gas in the outer tube, gas earlier with the refrigerant contact through most of inner tubes, gas can tentatively cool off this moment, and when gas flow to the other end of outer tube, the gas that cools off and the refrigerant contact that just got into the inner tube still can carry out good cooling to gas, and the cooling effect is better.
Optionally, the throttle is a section of throttle pipe, and the throttle pipe is fixedly connected with the inner pipe of the latter unit evaporator and has the same shape.
By adopting the technical scheme, when the inner pipes of the throttler and the evaporator are produced, a plurality of long pipelines with different diameters can be directly connected together, the cross sectional area of each section of pipeline is reduced in sequence, and the inner pipes of the throttler are formed. In two adjacent unit evaporators, the inner pipe of the latter unit evaporator is divided into two sections, one section of the inner pipe close to the former unit evaporator plays a throttling role, and the refrigerant pressure in one section of the inner pipe far away from the former unit evaporator is equal after passing through the section of the inner pipe. When the refrigerant is injected, the pressure of the refrigerant is controlled, so that the refrigerant in the inner pipe is kept in a vapor-liquid two-phase state, namely, the temperature of the refrigerant in the inner pipe of the single-unit evaporator is kept unchanged except for the part for throttling at the inlet section of the evaporator. Thereby achieving good cooling effect. The processing is simpler and easier, and the process of independently installing the electronic expansion valve or the capillary tube is omitted.
Optionally, the air inlet on the outer tube is located on one side close to the inlet end.
By adopting the technical scheme, because the temperatures of the refrigerants outside the throttling part in the inner pipe are equal, the air inlets are arranged on one side close to the inlet end, the structure is simple, the connection is easy, and the effect is the same as that of the refrigerant arranged on one side far away from the inlet end.
Optionally, the outer tubes of the unit evaporators are of equal diameter, and the restrictor is disposed inside the outer tubes of the unit evaporators.
Through adopting above-mentioned technical scheme, the outer tube diameter among the unit evaporator equals, consequently can directly make the outer tube with a long tube, makes all inner tubes all can wear to establish in the outer tube, and its structure is simpler, is convenient for assemble.
Optionally, the pretreatment device further comprises a pretreatment assembly, the pretreatment assembly comprises a regenerative tube, one end of the regenerative tube is provided with an inlet, the other end of the regenerative tube is provided with an outlet, an air inlet pipe is connected to an air inlet adjacent to the inlet end in the evaporator assembly, the air inlet pipe penetrates through the regenerative tube, an air outlet pipe is connected to the side wall of the outer tube of the evaporator assembly, and the air outlet pipe is connected with the inlet of the regenerative tube.
Through adopting above-mentioned technical scheme, after the air entered into the outer tube and cooled off, partial air was drawn forth from the outlet duct to in letting in the backheat pipe, can carry out the heat transfer to the intake pipe of establishing in the backheat pipe, make the difference in temperature between the gas that gets into in the unit evaporator and the refrigerant littleer, further improved heat exchange efficiency.
Optionally, the air outlet pipe is provided with a flow regulating assembly for controlling the air flow speed of the air outlet pipe.
Through adopting above-mentioned technical scheme, the volume of the air that can be convenient control through the flow control subassembly passes through in the backheat pipe to can make most air normally pass through the outer tube, and the less part air is used for being the refrigerant of primary cooling.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the amount of wasted low-temperature refrigerating capacity of the evaporator is effectively reduced, so that the amount of increased power consumption is reduced and the cost is reduced on the premise of ensuring lower minimum temperature, larger rated flow and larger temperature conversion range;
2. the structure is simple, and the processing and the assembly are easier.
Drawings
Fig. 1 is a schematic structural view of the related art.
Fig. 2 is a schematic structural diagram of a first embodiment of the present application.
Fig. 3 is a schematic structural diagram of a second embodiment of the present application.
Fig. 4 is a schematic structural diagram of a third embodiment of the present application.
Fig. 5 is a schematic structural diagram of a fourth embodiment of the present application.
Fig. 6 is a schematic structural diagram of a fifth embodiment of the present application.
Description of reference numerals: 1. an evaporator assembly; 11. a unit evaporator; 111. an inner tube; 112. an outer tube; 113. an entrance end; 114. an air inlet; 115. an air outlet; 2. a throttle assembly; 21. an electronic expansion valve; 22. a capillary tube; 3. a pre-processing assembly; 31. a heat recovery pipe; 32. an inlet; 33. an outlet; 34. an air outlet pipe; 35. an air inlet pipe; 4. a flow regulating assembly; 41. a flow regulating valve; 42. a gas flow sensor.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
Referring to fig. 1, the related art cold and hot air injection apparatus includes an evaporator assembly 1, the evaporator assembly 1 including a unit evaporator 11, the unit evaporator 11 including an inner tube 111 and an outer tube 112 fitted around the outer side of the inner tube 111. The refrigerant in the inner tube 111 flows into one end thereof as an inlet end 113, and the outer tube 112 has an outlet 115 at an end adjacent to the inlet end 113 and an inlet 114 at the other end.
The embodiment of the application discloses cold and hot air injection apparatus.
Example 1
Referring to fig. 2, the cold and hot air injection apparatus includes an evaporator assembly 1 and a throttle assembly 2. The evaporator assembly 1 comprises three unit evaporators 11, the throttling assembly 2 comprises two electronic expansion valves 21 serving as throttles, the unit evaporators 11 and the electronic expansion valves 21 are sequentially arranged at intervals, and two ends of each electronic expansion valve 21 are communicated with an inner pipe 111 of each unit evaporator 11. The electronic expansion valve 21 has an inner diameter smaller than the inner diameter of the inner tube 111 of the unit evaporator 11. The air outlet 115 of the outer tube 112 in the former unit evaporator 11 is connected to the air inlet 114 of the outer tube 112 in the latter unit evaporator 11.
The implementation principle of the embodiment 1 is as follows: in the two adjacent unit evaporators 11, when the refrigerant in the former unit evaporator 11 flows through the electronic expansion valve 21, the refrigerant flow rate increases, and the refrigerant pressure decreases, and the flow rate is kept constant after entering the latter unit evaporator 11. The boiling point of the refrigerant whose pressure is reduced is also lowered, and heat is absorbed during the vaporization of the refrigerant, so that the temperature in the subsequent unit evaporator 11 is lower than the temperature in the previous unit evaporator 11. It is possible to sequentially lower the pressure and temperature in the three unit evaporators 11. For example, the temperature in the first unit evaporator 11 is made to be 0 ℃, the temperature in the second unit evaporator 11 is made to be-40 ℃, and the temperature in the third unit evaporator 11 is made to be-85 ℃. When gas passes through each unit evaporator 11 gradually, the temperature difference between the gas and the unit evaporator 11 through which the gas passes can be kept in a smaller range, and the amount of waste of the low-temperature refrigerating capacity of the evaporator is effectively reduced, so that the amount of power consumption increase can be reduced and the cost can be reduced on the premise of ensuring lower minimum temperature, larger rated flow and larger temperature conversion range. And effectively improves the problem of the increase of the body volume.
Example 2
Referring to fig. 3, the cold and hot air injection apparatus is different from the first embodiment in that the throttling assembly 2 includes a capillary tube 22 as a throttling device, the unit evaporator 11 and the capillary tube 22 are sequentially spaced, and both ends of the capillary tube 22 are communicated with an inner tube 111 of the unit evaporator 11. The flow passage area of the capillary tube 22 is smaller than that of the inner tube 111 of the previous unit evaporator 11.
The implementation principle of the embodiment 2 is as follows: the capillary tube 22 also serves as a throttling function to bring the temperature in the first unit evaporator 11 to 0 c, the temperature in the second unit evaporator 11 to-40 c and the temperature in the third unit evaporator 11 to-85 c. After passing through the three unit evaporators, the temperature of the gas is gradually reduced.
Example 3
Referring to fig. 4, the cold and hot air injection apparatus includes three unit evaporators 11, and inner pipes 111 of the three unit evaporators 11 are sequentially connected. In the three inner pipes 111 from the inlet end 113 of the hot and cold air injection device to the other end, the cross-sectional area of each inner pipe 111 is reduced in turn. A throttle pipe as a throttle is provided between the two adjacent inner pipes, the throttle pipe is integrally formed on the inner pipe 111 of the subsequent unit evaporator 11, and the throttle pipe and the inner pipe 111 of the subsequent unit evaporator 11 have the same shape. In the outer tubes 112 of the three unit evaporators 11, one end adjacent to the inlet end 113 is provided with an air inlet 114, the other end is provided with an air outlet 115, the outer tubes 112 of the three unit evaporators 11 are sequentially connected, the diameters of the outer tubes 112 are all equal, and each inner tube 111 is arranged in the outer tube 112 in a penetrating manner.
The implementation principle of the embodiment 3 is as follows: when manufacturing the unit evaporator 11, three long pipes having different diameters and an extra long pipe having a diameter larger than the long pipes are selected. The three long pipelines are sequentially connected according to the descending order of the diameters, and the long pipelines are fixedly installed in the extra-long pipelines, namely the two ends of each long pipeline are located on the inner side of each long pipeline. In two adjacent unit evaporators 11, the latter long pipeline is divided into two sections, namely a front pipe close to the former long pipeline and a rear pipe far away from the former long pipeline, the front pipe plays a throttling role, when refrigerant passes through the front pipe, the flow rate of the refrigerant is increased, the pressure of the refrigerant is reduced, and when the refrigerant enters the rear pipe, the flow rate of the refrigerant is kept constant, and the temperature is kept constant. When the refrigerant is injected, the pressure of the refrigerant is controlled so that the refrigerant in the rear pipe is kept in a vapor-liquid two-phase state. The temperature in the first long pipeline is 0 ℃, the temperature in the second long pipeline is-40 ℃, and the temperature in the third long pipeline is-85 ℃, so that a good cooling effect can be achieved. Since the refrigerant temperature in the inner tube 111 outside the throttle portion is equal, the air inlets 114 are disposed on the side close to the inlet end 113, which facilitates installation.
Example 4
Referring to fig. 5, the cold and hot air injection apparatus includes three unit evaporators 11, the inner tubes 111 of the three unit evaporators 11 are sequentially disposed, and adjacent two inner tubes 111 are connected by a capillary tube 22. The end of the inner tube 111 into which the refrigerant flows is an inlet end 113, and the flow passage area of the capillary tube 22 is smaller than the flow passage area of the inner tube 111 of the previous unit evaporator 11. The outer tubes 112 of the three unit evaporators 11 are also connected in sequence, the diameters of the outer tubes 112 are all equal, and the inner tubes 111 and the capillary tubes 22 are all arranged in the outer tubes 112 in a penetrating manner. An air inlet 114 is provided at one end of the outer tube 112 adjacent to the inlet end 113, and an air outlet 115 is provided at the other end.
The implementation principle of the embodiment 4 is as follows: the capillary tube 22 acts as a throttle to bring the temperature in the first unit evaporator 11 to 0 deg.C, the temperature in the second unit evaporator 11 to-40 deg.C, and the temperature in the third unit evaporator 11 to-85 deg.C. The outer tubes 112 of the three unit evaporators 11 are the same tube, so that the structure is simpler.
Example 5
Referring to fig. 6, the cold and hot air injection apparatus is different from the third embodiment in that it further includes a pre-treatment assembly 3 and a flow rate adjustment assembly 4. The pre-treatment assembly 3 comprises a return pipe 31, one end of the return pipe 31 is provided with an inlet 32, and the other end is provided with an outlet 33. An outlet pipe 34 is connected to the outlet 115 of the unit evaporator 11 adjacent to the inlet end 113, and the other end of the outlet pipe 34 is connected to the inlet 32 of the return pipe 31. An air inlet pipe 35 is fixedly connected to the air inlet 114 of the unit evaporator 11 adjacent to the inlet end 113, and the air inlet pipe 35 penetrates through the heat recovery pipe 31. The flow regulating assembly 4 includes a flow regulating valve 41 and a gas flow sensor 42, the flow regulating valve 41 and the gas flow sensor 42 are both mounted on the gas outlet pipe 34, and the gas flow sensor 42 is mounted on the side of the flow regulating valve 41 near the outer pipe 112.
The implementation principle of the embodiment 5 is as follows: by adjusting the flow control valve 41, part of the cooled air can be led out of the outlet pipe 34 and introduced into the return pipe 31. The inlet pipe 35 penetrating the heat recovery pipe 31 can exchange heat, for example, the temperature of the gas entering the inlet end 113 of the unit evaporator 11 is reduced from 30 ℃ to about 0 ℃. The temperature difference between the gas in the unit evaporator 11 at the inlet end 113 and the refrigerant can be made smaller, further improving the heat exchange efficiency.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. The utility model provides a cold and hot gas injection apparatus, includes evaporator assembly (1), and evaporator assembly (1) includes unit evaporator (11), and unit evaporator (11) include inner tube (111) and cover establish outer tube (112) in inner tube (111) outside, and the one end of the refrigerant inflow in inner tube (111) is for getting into end (113), is equipped with air inlet (114) in outer tube (112) one end, and the other end is equipped with gas outlet (115), its characterized in that: the evaporator assembly (1) comprises at least two unit evaporators (11), inner pipes (111) of the unit evaporators (11) are sequentially connected, and an air outlet (115) of the previous unit evaporator (11) is connected with an air inlet (114) of the next unit evaporator (11); the throttling components (2) are arranged in the two adjacent unit evaporators (11), the throttling components (2) are connected with the inner pipes (111) of the two unit evaporators (11), and the flow passage area of the throttling components (2) is smaller than that of the inner pipe (111) of the previous unit evaporator (11); the throttling assembly (2) comprises a throttling device which is connected with inner pipes (111) of two adjacent unit evaporators (11); the throttler is a section of throttling pipeline, and the throttling pipeline is fixedly connected with an inner pipe (111) of the next unit evaporator (11) and has the same shape.
2. A cold and hot air injection apparatus according to claim 1, wherein: the throttler is an electronic expansion valve (21) or a capillary tube (22).
3. A cold and hot air injection apparatus according to claim 2, wherein: the air inlets (114) on the outer pipe (112) are all positioned on one side far away from the inlet end (113).
4. A cold and hot air injection apparatus according to claim 1, wherein: the air inlets (114) on the outer pipe (112) are all positioned on one side close to the inlet end (113).
5. A cold and hot air blowing device according to claim 1 or 2, wherein: the outer tubes (112) of the unit evaporators (11) are of equal diameter, and the restrictor is arranged inside the outer tubes (112) of the unit evaporators (11).
6. A cold and hot air injection apparatus according to claim 1, wherein: still include preliminary treatment subassembly (3), preliminary treatment subassembly (3) including backheat pipe (31), the one end of backheat pipe (31) is equipped with import (32), the other end is provided with export (33), air inlet (114) department adjacent with entering end (113) in evaporimeter subassembly (1) is connected with intake pipe (35), backheat pipe (31) are worn to establish in intake pipe (35), be connected with on outer tube (112) lateral wall of evaporimeter subassembly (1) outlet duct (34), outlet duct (34) are connected with import (32) of backheat pipe (31).
7. A cold and hot air injection apparatus according to claim 6, wherein: and the air outlet pipe (34) is provided with a flow regulating component (4) for controlling the air flow speed of the air outlet pipe (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011277947.9A CN112413916B (en) | 2020-11-16 | 2020-11-16 | Cold and hot gas injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011277947.9A CN112413916B (en) | 2020-11-16 | 2020-11-16 | Cold and hot gas injection device |
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| Publication Number | Publication Date |
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| CN112413916A CN112413916A (en) | 2021-02-26 |
| CN112413916B true CN112413916B (en) | 2022-01-07 |
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1229902A (en) * | 1998-03-24 | 1999-09-29 | 赖邦跃 | One-stage steam compressed refrigerating circulating system |
| JP2985882B1 (en) * | 1998-08-21 | 1999-12-06 | ダイキン工業株式会社 | Double tube heat exchanger |
| KR101620106B1 (en) * | 2010-01-15 | 2016-05-13 | 엘지전자 주식회사 | Double-piped heat exchanger |
| CN102032825A (en) * | 2011-01-10 | 2011-04-27 | 天津商业大学 | Heat exchange tube for evaporator and evaporator formed by same |
| CN102679652B (en) * | 2011-12-23 | 2015-04-08 | 河南科技大学 | Method and device for preparing ice slurry |
| DE102013226341A1 (en) * | 2013-12-18 | 2015-06-18 | BSH Hausgeräte GmbH | Refrigerating appliance with several cold compartments |
| CN104896637A (en) * | 2015-05-30 | 2015-09-09 | 华为技术有限公司 | Light-load dehumidification and refrigeration method and device |
| CN105402819B (en) * | 2015-12-31 | 2018-08-24 | 海信（山东）空调有限公司 | A kind of dehumidification air conditioner and dehumanization method |
| CN209623433U (en) * | 2019-01-04 | 2019-11-12 | 特灵空调系统(中国)有限公司 | A kind of variable cross-section heat exchanger |
| CN210374250U (en) * | 2019-06-11 | 2020-04-21 | 合肥海尔电冰箱有限公司 | Refrigerating and freezing device |
| CN211625782U (en) * | 2019-12-09 | 2020-10-02 | 青岛海尔智能技术研发有限公司 | A liquid drop evaporation plant and cooling water set for cooling water set |
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Application publication date: 20210226 Assignee: Zhongke Keling (Beijing) Technology Co.,Ltd. Assignor: CHINA-SCICOOLING (BEIJING) SCIENCE & TECHNOLOGY CO.,LTD. Contract record no.: X2022990000341 Denomination of invention: A cold and hot gas injection device Granted publication date: 20220107 License type: Common License Record date: 20220701 |
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