阅读说明：本技术 单机二次节流回热式制冷循环系统 (Single-machine secondary throttling regenerative refrigeration cycle system ) 是由 赵冲 单波 李培荣 吉喆 张进益 马志远 于 2019-09-24 设计创作，主要内容包括：本发明公开了一种单机二次节流回热式制冷循环系统,包括压缩机Ⅰ、冷凝器Ⅰ、干燥过滤器Ⅰ、回热换热器Ⅰ、第一节流阀Ⅰ、第二节流阀Ⅰ和蒸发器Ⅰ。制冷工质经压缩机Ⅰ、冷凝器Ⅰ和干燥过滤器Ⅰ后通过三通阀分为两路,第一路进入回热换热器Ⅰ的高温端再经第一节流阀Ⅰ后进入蒸发器Ⅰ制冷,第二路经第二节流阀Ⅰ后进入回热换热器Ⅰ的低温端,制冷工质通过回热换热器Ⅰ完成换热后,第一路蒸发器Ⅰ的出口端与第二路回热换热器Ⅰ的低温换热出口端通过三通阀合流后与压缩机Ⅰ的吸气口连接。该系统与现有技术相比进一步提高了节流阀前的液体过冷度,同时降低了压缩机吸气温度,进而使吸气比体积减少,提高了压缩机的单位制冷量。(The invention discloses a single-machine secondary throttling regenerative refrigeration cycle system which comprises a compressor I, a condenser I, a drying filter I, a regenerative heat exchanger I, a first throttle valve I, a second throttle valve I and an evaporator I. The refrigerating medium is divided into two paths through a three-way valve after passing through a compressor I, a condenser I and a drying filter I, the first path enters a high-temperature end of a regenerative heat exchanger I and then enters an evaporator I for refrigeration after passing through a first throttle valve I, the second path enters a low-temperature end of the regenerative heat exchanger I after passing through a second throttle valve I, the refrigerating medium completes heat exchange through the regenerative heat exchanger I, and an outlet end of the first path of evaporator I and a low-temperature heat exchange outlet end of the second path of regenerative heat exchanger I are connected with an air suction port of the compressor I after converging through the three-way valve. Compared with the prior art, the system further improves the liquid supercooling degree in front of the throttle valve, and simultaneously reduces the air suction temperature of the compressor, so that the air suction specific volume is reduced, and the unit refrigerating capacity of the compressor is improved.)

1. Unit secondary throttle backheating formula refrigeration cycle system, its characterized in that includes: the system comprises a compressor I, a condenser I, a drying filter I, a regenerative heat exchanger I, a first throttle valve I, a second throttle valve I and an evaporator I;

an exhaust port of the compressor I is connected with a condenser I, the condenser I is connected with a drying filter I, and an outlet of the drying filter I is divided into two paths through a three-way valve;

the first path is connected with a high-temperature heat exchange inlet end of a regenerative heat exchanger I, and a high-temperature heat exchange outlet end of the regenerative heat exchanger I is connected with a first throttle valve I, throttled by the first throttle valve I and then connected with an inlet end of an evaporator I;

the second path is connected with a second throttle valve I, throttled by the second throttle valve I and then connected with the low-temperature heat exchange inlet end of the regenerative heat exchanger I;

after the refrigeration working medium completes heat exchange through the first regenerative heat exchanger, the outlet end of the first path of evaporator I and the low-temperature heat exchange outlet end of the second path of regenerative heat exchanger I are connected with the air suction port of the compressor I after converging through a three-way valve.

2. The single-machine secondary throttling regenerative refrigeration cycle system according to claim 1, wherein the second throttle valve I is provided with a solenoid valve for controlling the opening and closing of the second throttle valve I.

3. Unit secondary throttle backheating formula refrigeration cycle system, its characterized in that includes: the system comprises a compressor II, a condenser II, a drying filter II, a regenerative heat exchanger II, a first throttle valve II, a second throttle valve II and an evaporator II;

the air outlet of the compressor II is connected with a condenser II, the condenser II is connected with a drying filter II, and the outlet of the drying filter II is divided into two paths through a three-way valve;

the first path is connected with a high-temperature heat exchange inlet end of a regenerative heat exchanger II, and a high-temperature heat exchange outlet end of the regenerative heat exchanger II is connected with a first throttle valve II, throttled by the first throttle valve II and then connected with an inlet end of an evaporator II;

the second path is connected with the inlet end of a second throttling valve II, and the second throttling valve II plays a throttling role;

and after the refrigeration working medium completes heat exchange through the second regenerative heat exchanger II, the low-temperature heat exchange outlet end of the second regenerative heat exchanger II is connected with an air suction port of the compressor II.

4. The single-machine secondary throttling regenerative refrigeration cycle system according to claim 3, wherein the second throttle valve II is provided with a solenoid valve for controlling the opening and closing of the second throttle valve II.

5. Unit secondary throttle backheating formula refrigeration cycle system, its characterized in that includes: the system comprises a compressor III, a condenser III, a drying filter III, a regenerative heat exchanger III with two high-temperature heat exchange ends, a first throttling valve III, a second throttling valve III and an evaporator III;

the air outlet of the compressor III is connected with a condenser III, the condenser III is connected with a drying filter III, and the outlet of the drying filter III is divided into two paths through a three-way valve;

the first path is connected with a first high-temperature heat exchange inlet end of a regenerative heat exchanger III, and a first high-temperature heat exchange outlet end of the regenerative heat exchanger III is connected with a first throttling valve III, throttled by the first throttling valve III and then connected with an inlet end of an evaporator III;

the second path is connected with a second high-temperature heat exchange inlet end of a regenerative heat exchanger III, a second high-temperature heat exchange outlet end of the regenerative heat exchanger III is connected with an inlet end of a second throttling valve III, and the second throttling valve III plays a throttling role;

and after the refrigeration working medium completes heat exchange through the regenerative heat exchanger III, the low-temperature heat exchange outlet end of the regenerative heat exchanger III is connected with an air suction port of the compressor III.

6. The single-machine secondary throttling regenerative refrigeration cycle system according to claim 5, wherein the second throttle valve III is provided with a solenoid valve for controlling the opening and closing of the second throttle valve III.

Technical Field

The invention relates to the technical field of refrigeration, in particular to a single-machine secondary throttling regenerative refrigeration cycle system.

Background

The single-machine vapor compression refrigeration cycle equipment mainly comprises four parts: the compressor, the condenser, the throttling device and the evaporator are closely matched to cool the box body. The condenser and the evaporator are heat exchange parts, the condenser is used as a heat release part to exchange heat with ambient air, and the evaporator is used as a heat absorption refrigeration part to exchange heat with a refrigeration space. The main working principle is as follows: the refrigerant is compressed into high-temperature high-pressure gas by a compressor, the high-temperature high-pressure gas is released by a condenser to form low-temperature high-pressure liquid, the low-temperature high-pressure liquid is throttled and depressurized by a throttling device to form low-temperature low-pressure liquid, the low-temperature low-pressure liquid is gasified by an evaporator to absorb heat to form normal-temperature low-pressure gas, the normal-temperature low-pressure gas returns to the compressor again, and the circulation.

Due to the influence of the clearance volume of the compressor and other factors, the refrigerating capacity of the compressor is greatly reduced when the pressure ratio of the refrigerating system is too high, and the power consumption is increased along with the reduction. Even when the evaporation temperature is reduced, the suction ratio volume of the compressor is gradually increased, and the compressor does not discharge air and refrigerate any more after the suction ratio volume of the compressor is increased to a certain degree, so that the refrigeration efficiency becomes zero.

Disclosure of Invention

The invention aims to provide a single-machine secondary throttling regenerative refrigeration cycle system, which further improves the liquid supercooling degree in front of a main throttling valve and simultaneously reduces the air suction temperature of a compressor by secondary throttling and regenerative refrigeration cycle compared with the prior art, thereby reducing the air suction specific volume and improving the unit refrigerating capacity of the compressor.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the first scheme is as follows:

unit secondary throttle backheating formula refrigeration cycle system includes: compressor I, condenser I, drier-filter I, backheat heat exchanger I, first choke valve I, second choke valve I and evaporimeter I. I gas vent of compressor is connected with condenser I, condenser I is connected with drier-filter I, drier-filter I export is divided into two the tunnel through the three-way valve.

The first path is connected with a high-temperature heat exchange inlet end of the regenerative heat exchanger I, and a high-temperature heat exchange outlet end of the regenerative heat exchanger I is connected with the first throttle valve I and is connected with an inlet end of the evaporator I after being throttled by the first throttle valve I. Meanwhile, the second path is connected with a second throttle valve I, throttled by the second throttle valve I and then connected with the low-temperature heat exchange inlet end of the regenerative heat exchanger I. After the refrigeration working medium completes heat exchange through the first regenerative heat exchanger, the outlet end of the first path of evaporator I and the low-temperature heat exchange outlet end of the second path of regenerative heat exchanger I are connected with the air suction port of the compressor I after converging through a three-way valve.

Further, the second throttle valve I is provided with an electromagnetic valve for controlling the opening and closing of the second throttle valve I.

Scheme II:

unit secondary throttle backheating formula refrigeration cycle system includes: the system comprises a compressor II, a condenser II, a drying filter II, a regenerative heat exchanger II, a first throttle valve II, a second throttle valve II and an evaporator II. The air outlet of the compressor II is connected with a condenser II, the condenser II is connected with a drying filter II, and the outlet of the drying filter II is divided into two paths through a three-way valve.

The first path is connected with a high-temperature heat exchange inlet end of the regenerative heat exchanger II, a high-temperature heat exchange outlet end of the regenerative heat exchanger II is connected with the first throttling valve II, and the high-temperature heat exchange outlet end of the regenerative heat exchanger II is connected with an inlet end of the evaporator II after being throttled by the first throttling valve II. Meanwhile, the second path is connected with the inlet end of a second throttling valve II, and the second throttling valve II plays a throttling role. And after the refrigeration working medium completes heat exchange through the second regenerative heat exchanger II, the low-temperature heat exchange outlet end of the second regenerative heat exchanger II is connected with an air suction port of the compressor II.

Further, the second throttle valve II is provided with an electromagnetic valve for controlling the opening and closing of the second throttle valve II.

The third scheme is as follows:

unit secondary throttle backheating formula refrigeration cycle system includes: the system comprises a compressor III, a condenser III, a drying filter III, a heat regenerator III with two high-temperature heat exchanging ends, a first throttling valve III, a second throttling valve III and an evaporator III. The air outlet of the compressor III is connected with a condenser III, the condenser III is connected with a drying filter III, and the outlet of the drying filter III is divided into two paths through a three-way valve.

The first path is connected with a first high-temperature heat exchange inlet end of a regenerative heat exchanger III, and a first high-temperature heat exchange outlet end of the regenerative heat exchanger III is connected with a first throttling valve III, throttled by the first throttling valve III and then connected with an inlet end of an evaporator III. Meanwhile, the second path is connected with a second high-temperature heat exchange inlet end of the regenerative heat exchanger III, a second high-temperature heat exchange outlet end of the regenerative heat exchanger III is connected with an inlet end of a second throttling valve III, and the second throttling valve III plays a throttling role. And after the refrigeration working medium completes heat exchange through the regenerative heat exchanger III, the low-temperature heat exchange outlet end of the regenerative heat exchanger III is connected with an air suction port of the compressor III.

Further, the second throttle valve iii is provided with an electromagnetic valve for controlling the opening and closing of the second throttle valve iii.

Compared with the prior art, the invention has the following beneficial effects:

(1) in the regenerative refrigeration cycle process, the supercooling degree of the liquid in front of the first throttle valve, namely the main throttle valve, is improved by throttling the first throttle valve and the second throttle valve twice, so that the refrigerating capacity of the whole cycle is improved, and the working efficiency of a refrigeration system is increased.

(2) The second throttle valve reduces the air suction temperature of the compressor, further reduces the air suction specific volume, ensures that the compressor has certain air suction amount at very low evaporation temperature, further ensures the refrigerating capacity of the compressor, and can reach very low refrigerating temperature by using the single compressor of the refrigerating cycle system in practical application.

(3) Compared with the mixed working medium used in the prior art, the invention only uses a single refrigeration working medium and eliminates the gas-liquid separator, thereby reducing the manufacturing cost of the product and simultaneously reducing the maintenance cost and the after-sale rate of the corresponding equipment.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment.

FIG. 2 is a schematic structural diagram of the second embodiment.

FIG. 3 is a schematic diagram of the third embodiment.

Detailed Description

The technical scheme of the invention is specifically explained below by combining the attached drawings.