Auto-cascade refrigeration device

Abstract

The invention discloses an auto-cascade refrigeration device. The auto-cascade refrigeration device comprises a compressor, a condenser, a gas-liquid separator, a first condensation evaporator and an evaporator which are connected in series. A heat recovery device and a cooling device are further arranged, the cooling device comprises a second condensation evaporator, the inlet end of a condensation area of the second condensation evaporator is communicated with the liquid outlet end of the gas-liquid separator, and the outlet end of the condensation area is communicated with the electromagnetic valve. The outlet end of the condensation area of the second condensation evaporator is communicated with the evaporation area of the second condensation evaporator, and the evaporation area of the second condensation evaporator is communicated with the medium-pressure inlet end of the compressor. The structure is further simplified, the size is smaller, and the cost is lower. The heat exchange tank is used for conducting heat exchange on high-temperature and high-pressure gas compressed by the compressor, and the device is suitable for being used in high-latitude areas. And the arranged cooling device can effectively cool the compressor, is particularly suitable for being used in summer in low-latitude areas, guarantees normal operation of the compressor, is stable in refrigeration effect, and also prolongs the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a self-cascade refrigeration device. Background Art

[0002] In the field of cascade refrigeration equipment, two or more refrigerants are used. Taking existing cascade refrigeration equipment as an example, in order to achieve better cooling effect, the equipment is generally large in size and complex in structure, resulting in a lack of obvious cost advantage.

[0003] Furthermore, existing cascade refrigeration systems have limited functionality, and their operation is affected by variations in latitude. For example, in low-latitude regions, high summer temperatures place heavy loads on the compressor, impacting the equipment's operation and lifespan. Meanwhile, in high-latitude regions, where winter temperatures are low, refrigeration systems lack additional auxiliary heat exchange capabilities, preventing full utilization of the heat from the compressed, high-temperature, and high-pressure gas, resulting in a limited functionality.

[0004] Therefore, it is necessary to develop a self-cascade refrigeration device with a simple and reliable structure and more functions to meet the needs of different customers. Summary of the Invention

[0005] The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art and to provide a self-cascade refrigeration device with a simpler structure and multiple extended functions, such as heat recovery and compressor cooling, which brings more convenience while reducing costs.

[0006] In order to achieve the above object, the present invention provides an auto-cascade refrigeration device, comprising a compressor (model and specifications of other components), wherein the high-pressure outlet end of the compressor is connected to the inlet end of the condenser; Also includes: a gas-liquid separator, the inlet end of which is in communication with the outlet end of the condenser; Condenser evaporator 1, the evaporation zone inlet end of which is connected to the liquid outlet end of the gas-liquid separator, and a first solenoid valve and a first expansion valve are sequentially provided on the front road of the connection point, the evaporation zone outlet end of which is connected to the low-pressure inlet end of the compressor; the condensation zone inlet end of which is connected to the gas outlet end of the gas-liquid separator, and the condensation zone outlet end of which is sequentially provided with a second solenoid valve and a second expansion valve; The evaporator has an outlet end connected to the low-pressure inlet end of the compressor, and an inlet end connected to the second expansion valve.

[0007] As a further improvement, it also includes an oil separator, whose inlet end is connected to the high-pressure outlet end of the compressor, and whose oil return end is connected to the oil inlet of the compressor; and whose outlet end is connected to the inlet end of the condenser.

[0008] As a further improvement, a liquid storage tank is further provided, the inlet end of which is communicated with the liquid outlet end of the gas-liquid separator, and the outlet end of which is communicated with the first solenoid valve.

[0009] As a further improvement, a filter element is further provided, which is arranged at the liquid outlet end of the gas-liquid separator and / or the outlet end of the liquid storage tank.

[0010] As a further improvement, a liquid storage bag is further provided, the inlet end of which is communicated with the outlet end of the condensation zone of the first condenser evaporator, and the outlet end of which is communicated with the second solenoid valve.

[0011] As a further improvement, a pressure relief tank is provided, which is connected to the front path of the low-pressure inlet end of the compressor.

[0012] As a further improvement, a heat recovery device is also provided, which includes a heat exchange tank, in which independent high-temperature channels and low-temperature channels are provided. The high-temperature channel is connected in series with the high-pressure pipeline at the high-pressure outlet end of the compressor, and the low-temperature channel is connected in series with the water inlet pipe and the water outlet pipe.

[0013] As a further improvement, a cooling device is also provided, which includes a second condenser evaporator, the inlet end of the condensation zone of the second condenser evaporator is connected to the liquid outlet end of the gas-liquid separator and / or the outlet end of the liquid storage tank, and the outlet end of the condensation zone is connected to the first solenoid valve; the outlet end of the condensation zone of the second condenser evaporator is also connected to the evaporation zone of the second condenser evaporator through a third solenoid valve and a third expansion valve in sequence, and the evaporation zone of the second condenser evaporator is connected to the medium-pressure inlet end of the compressor through a pipeline.

[0014] As a further improvement, a high-low pressure controller is provided between the low-pressure inlet and the high-pressure outlet of the compressor 101 .

[0015] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: The present invention further simplifies its structure, resulting in a smaller size and lower cost. The heat exchanger utilizes a heat exchange tank to exchange heat with the high-temperature, high-pressure gas compressed by the compressor, making it suitable for use in high-latitude regions and providing a source of hot water for ease of use. Furthermore, the included cooling device effectively cools the compressor, making it particularly suitable for summer use in low-latitude regions. This ensures the compressor's normal operation, provides a stable cooling effect, and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the present invention is schematically shown Figure 1 ; Figure 2 It is a schematic cross-sectional view of the structure of the heat exchange tank in the present invention; Figure 3The structure of the present invention is schematically shown Figure 2 ; Figure 4 The principle of the present invention Figure 1 ; Figure 5 The principle of the present invention Figure 2 ; Figure 6 The principle of the present invention Figure 3 .

[0017] In the picture: 101, compressor 1011, high-pressure pipeline 102, oil separator 103, condenser 104, gas-liquid separator 105, condenser evaporator 106, evaporator 107, liquid storage tank 108, filter element 109, first solenoid valve 110, first expansion valve 111, second solenoid valve 112, second expansion valve 113, pressure relief tank 114, liquid storage bag; 200, heat recovery device 201, partition 202, low-temperature channel 203, water inlet pipe 204, water outlet pipe 205, heat exchange tank; 300, cooling device 301, condenser evaporator 2 302, third solenoid valve 303, third expansion valve. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0019] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0021] Example 1 refer to Figure 1 and Figure 4 This embodiment discloses an auto-cascade refrigeration device including a compressor 101. In practice, either an oil- or oil-free compressor can be used as needed. This embodiment uses an oil-based compressor as an example for detailed description. Furthermore, the refrigerant used is a mixed gas of R22 and R23. The two gases are mixed and adiabatically compressed by compressor 101.

[0022] The high-pressure outlet of compressor 101 is connected to the inlet of oil separator 102 (e.g., a centrifugal or filtering type). This separates some of the lubricating oil from the compressed, high-temperature, high-pressure gas and returns it to the oil inlet of compressor 101 through the oil return port, enabling the reuse of the lubricating oil. The outlet of oil separator 102 is connected to the inlet of condenser 103 via a pipeline. The compressed, high-temperature, high-pressure gas is cooled and liquefied within condenser 103. This is a conventional arrangement.

[0023] The system also includes a gas-liquid separator 104, whose inlet is connected to the outlet of the condenser 103. The condensed media (i.e., R22 and R23) are separated within the gas-liquid separator 104. Specifically, due to its chemical properties, the R22 medium is first condensed and liquefied, and stored in the lower portion of the gas-liquid separator 104. However, due to its chemical properties, the R23 medium does not condense into a liquid state and is stored as a gas in the upper portion of the gas-liquid separator 104. The liquid level within the gas-liquid separator 104 can be seen through a window or level gauge.

[0024] The liquid outlet at the bottom of the gas-liquid separator 104 is connected to the evaporation zone inlet of the condenser-evaporator 105 via a pipeline. This pipeline is also provided with a first solenoid valve 109 and a first expansion valve 110. Of course, a filter element can also be provided at the front end of the first solenoid valve 109 to enhance filtering. After passing through the first expansion valve 110, the liquid medium R22 enters the evaporation zone of the condenser-evaporator 105, where it expands in volume, reduces in pressure, and absorbs heat, evaporating into a gaseous state. The gaseous medium R22 then re-enters the low-pressure inlet of the compressor through a pipeline for further recycling.

[0025] Meanwhile, the gas outlet at the top of gas-liquid separator 104 is connected to the condensation zone inlet of condenser-evaporator 105 via a pipeline. A gas storage tank can also be placed between the two for buffering. After gaseous medium R23 enters this zone, it exchanges heat with medium R22, which is traveling along a different path (i.e., the evaporation zone) (similar to the heat exchange principle of a plate heat exchanger). In other words, medium R22 absorbs heat from medium R23 and evaporates into a gaseous state. After losing heat, medium R23 condenses and liquefies, achieving the purpose of liquefying medium R23.

[0026] The liquefied medium R23 is connected via a pipeline to the inlet of evaporator 106, which is located in a cold storage area (such as a cold storage room, a cold room, or a freeze-drying facility) for refrigeration. This pipeline is also equipped with a second solenoid valve 111 and a second expansion valve 112. After passing through the second expansion valve 112, the medium R23 expands in volume and decreases in pressure, absorbing heat and evaporating into a gaseous state. During this process, heat from the cold storage area is absorbed and carried away with the medium R23. The gaseous medium R23 then re-enters the low-pressure inlet of the compressor through the pipeline for further recycling.

[0027] A pressure relief tank 113 may also be provided upstream of the low-pressure inlet of the compressor to stabilize the pressure of the gaseous media R22 and R23. To prevent the exhaust and intake pressures from being too high or too low, high and low pressure controllers may also be provided between the low-pressure inlet and high-pressure outlet of the compressor 101. Of course, an oil-filled low-pressure gauge may also be provided at the inlet of the compressor 101, and an oil-filled high-pressure gauge at the outlet of the compressor 101, to allow for real-time monitoring of the gauge pressures at the inlet and outlet of the compressor 101.

[0028] The paths of the two media have been detailed. After being compressed together, they exchange heat with each other, achieving a single-unit cascade cooling effect. The overall structure is simpler, and the use of solenoid valves for electronic control of media flow and pressure ensures more stable and reliable operation.

[0029] In this embodiment, a liquid storage tank 107 may be provided at the liquid outlet of the gas-liquid separator 104. The outlet of the liquid storage tank 107 is further connected to a first solenoid valve 109 to further stabilize the pressure and ensure sufficient usage. A filter element 108 may also be provided at the outlet of the liquid storage tank 107 for drying and dehumidification.

[0030] As a further improvement, a liquid storage bag 114 is provided at the outlet of the condensing zone of the condenser evaporator 105 to further stabilize the pressure and to allow another path to be drawn out for cascade refrigeration. The outlet of the liquid storage bag 114 is connected to the second solenoid valve 112.

[0031] Example 2 The similarities between this embodiment and the first embodiment are not described in detail.

[0032] refer to Figure 2 As shown in the dotted frame portion indicated by serial number 200, the purpose of this embodiment is to realize heat recovery and utilization, and heat water for people's convenience.

[0033] It includes a heat exchange tank 205, which is equipped with independent high-temperature and low-temperature channels 202. The high-temperature channel is connected in series with the high-pressure pipeline 1011 at the high-pressure outlet of the compressor 101. As can be seen from the figure, the high-temperature channel is spiral and relative to the high-pressure pipeline 1011. The low-temperature channel 202 is connected in series with the water inlet pipe 203 and the water outlet pipe 204. The low-temperature channel 202 is separated by partitions 201 to form multiple staggered paths to achieve slow convection of water. After sufficient heat exchange, the water is discharged through the water outlet pipe 204 for use.

[0034] This structure is particularly suitable for high-latitude areas. In winter, it can not only provide cooling but also hot water, which expands the function and further reduces the subsequent load.

[0035] Example 3 The similarities between this embodiment and the first embodiment are not described in detail.

[0036] refer to Figure 3 As shown in the dashed box indicated by serial number 300, this embodiment is intended to cool the compressor during summer use in low-latitude regions, preventing excessive temperatures and load on the compressor, which could affect refrigeration performance and lifespan. This embodiment adds a heat exchange link to the existing piping. When compressor cooling is required, this link can be activated. When cooling is not required, the medium passes through this link, but no heat exchange occurs.

[0037] It includes a second condenser evaporator 301. The inlet of the condensation zone of the second condenser evaporator 301 is connected to the liquid outlet of the gas-liquid separator 104 and / or the outlet of the liquid storage tank 107. Liquid medium R22 first enters this condensation zone, where it waits for heat exchange or output. The outlet of the condensation zone is connected to the first solenoid valve 109, allowing it to enter the first condenser evaporator 105.

[0038] In addition, the outlet end of the condensation zone of the condenser evaporator 2 301 is also connected to the evaporation zone of the condenser evaporator 2 301 through the third solenoid valve 302 and the third expansion valve 303 in sequence, and the evaporation zone of the condenser evaporator 2 301 is connected to the medium-pressure inlet end of the compressor 101 through a pipeline.

[0039] That is, the liquid medium R22 discharged from the outlet of the condensation zone of the second condenser evaporator 301 is divided into two paths.

[0040] The first path is to enter the evaporation zone of the condenser evaporator 105 through the first solenoid valve 109 and the first expansion valve 110. In this path, the condenser evaporator 2 301 does not work and is only a loop for the liquid medium R22 to flow through. This path is suitable for the operation of the compressor 101 when the load is not large and the temperature is not high.

[0041] The second path is to open the third solenoid valve 302 and the third expansion valve 303 to divert a portion of the liquid medium R22 in path one to the evaporation zone of the condenser evaporator 2 301, that is, to communicate with the evaporation zone of the condenser evaporator 2 301. The liquid medium R22 will expand in volume and reduce pressure in the evaporation zone, absorb heat and evaporate into a gaseous state, and then enter the medium-pressure inlet end of the compressor, thereby cooling the compressor. When the ambient temperature is high and the compressor load is large, it can be opened at the same time as the first path to reduce the high temperature of the compressor and reduce the load of the compressor. It is suitable for use in the southern region in summer. In this path, the medium R22 in the evaporation zone of the condenser evaporator 2 301 can also cool the medium R22 in the condensation zone of the condenser evaporator 2 301 again, which can achieve a better cooling effect.

[0042] During the test phase, an empty warehouse with a length of 2.7 meters, a width of 2.5 meters and a height of 2.7 meters was used as the test space. A 10-centimeter polyurethane foam board was set on the periphery of the empty warehouse as an insulation layer. When the outdoor temperature was 28°C and the sun was directly shining, the device could achieve a low temperature range of -40°C to -54.1°C.

[0043] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: The present invention further simplifies its structure, resulting in a smaller size and lower cost. The heat exchanger utilizes a heat exchange tank to exchange heat with the high-temperature, high-pressure gas compressed by the compressor, making it suitable for use in high-latitude regions and providing a source of hot water for ease of use. Furthermore, the included cooling device effectively cools the compressor, making it particularly suitable for summer use in low-latitude regions. This ensures the compressor's normal operation, provides a stable cooling effect, and extends its service life.

[0044] Although the present invention has been described above with reference to exemplary embodiments, various modifications may be made thereto and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various features of the embodiments disclosed herein may be combined with one another in any manner, provided no structural conflicts exist. The omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. An auto-cascade refrigeration device, comprising a compressor (101), wherein a high-pressure outlet end of the compressor (101) is connected to an inlet end of a condenser (103); Its characteristics are: Also includes: a gas-liquid separator (104), the inlet end of which is in communication with the outlet end of the condenser (103); Condenser evaporator 1 (105), the evaporation zone inlet end of which is connected to the liquid outlet end of the gas-liquid separator (104), and a first solenoid valve (109) and a first expansion valve (110) are sequentially provided on the front road of the connection point, the evaporation zone outlet end of which is connected to the low-pressure inlet end of the compressor (101); the condensation zone inlet end of which is connected to the gas outlet end of the gas-liquid separator (104), and the condensation zone outlet end of which is sequentially provided with a second solenoid valve (111) and a second expansion valve (112); The evaporator (106) has an outlet end connected to the low-pressure inlet end of the compressor (101), and an inlet end connected to the second expansion valve (112).

2. The auto-cascade refrigeration device according to claim 1, wherein: It also includes an oil separator (102), the inlet end of which is connected to the high-pressure outlet end of the compressor (101), the oil return end of which is connected to the oil inlet of the compressor (101), and the outlet end of which is connected to the inlet end of the condenser (103).

3. The auto-cascade refrigeration device according to claim 1 or 2, characterized in that: A liquid storage tank (107) is also provided, the inlet end of which is in communication with the liquid outlet end of the gas-liquid separator (104), and the outlet end of which is in communication with the first solenoid valve (109).

4. The auto-cascade refrigeration device according to claim 3, wherein: A filter element (108) is also provided, which is arranged at the liquid outlet end of the gas-liquid separator (104) and / or the outlet end of the liquid storage tank (107).

5. The auto-cascade refrigeration device according to claim 1, wherein: A liquid storage bag (114) is also provided, the inlet end of which is in communication with the outlet end of the condensation zone of the first condenser evaporator (105), and the outlet end of which is in communication with the second solenoid valve (112).

6. The auto-cascade refrigeration device according to claim 1, characterized in that: A pressure relief tank (113) is also provided, which is in front communication with the low-pressure inlet end of the compressor (101).

7. The auto-cascade refrigeration device according to claim 1 or 4, characterized in that: A heat recovery device (200) is also provided, comprising a heat exchange tank (205), wherein the heat exchange tank (205) is provided with a high-temperature channel and a low-temperature channel (202) which are independent of each other, wherein the high-temperature channel is connected in series with a high-pressure pipe (1011) at the high-pressure outlet end of the compressor (101), and the low-temperature channel (202) is connected in series with a water inlet pipe (203) and a water outlet pipe (204).

8. The auto-cascade refrigeration device according to claim 7, characterized in that: A cooling device (300) is also provided, which includes a second condenser evaporator (301), the inlet end of the condensation zone of the second condenser evaporator (301) is connected to the liquid outlet end of the gas-liquid separator (104) and / or the outlet end of the liquid storage tank (107), and the outlet end of the condensation zone is connected to the first electromagnetic valve (109); the outlet end of the condensation zone of the second condenser evaporator (301) is also connected to the evaporation zone of the second condenser evaporator (301) through the third electromagnetic valve (302) and the third expansion valve (303) in sequence, and the evaporation zone of the second condenser evaporator (301) is connected to the medium-pressure inlet end of the compressor (101) through a pipeline.

9. The auto-cascade refrigeration device according to claim 1, characterized in that: A high- and low-pressure controller is provided between the low-pressure inlet and the high-pressure outlet of the compressor (101).

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