CN218442847U - Direct expansion type micro-power liquid full-filling and liquid-supplying refrigerating device - Google Patents

Abstract

The utility model provides a directly throw formula micro-power full liquid and supply liquid refrigerating plant, including supplying liquid vapour and liquid separator, cooling equipment, middle vapour and liquid separator, compressor return-air pipeline, return-liquid pipe, high-pressure liquid storage pot and expansion valve. The liquid supply gas-liquid separator is arranged between the expansion valve and the cooling dispersing equipment, the middle gas-liquid separator is arranged at the downstream of the cooling dispersing equipment, and a liquid return pipe communicated with the liquid supply gas-liquid separator and the middle gas-liquid separator is arranged; compared with the prior art, the refrigerating device of the utility model supplies pure liquid refrigerant to the cooling equipment instead of gas-liquid mixed refrigerant, and the pure liquid refrigerant is easier to be evenly distributed in the cooling equipment, thus better playing the cooling effect; the refrigerant output from the cold dispersing equipment is not directly conveyed to the gas return pipeline of the compressor, but is separated again through the middle gas-liquid separator, so that the problem of liquid impact frequently encountered by the traditional direct expansion type refrigerating device is solved, the running stability of the equipment is improved, and the service life of the equipment is prolonged.

Description

Direct expansion type micro-power liquid full-filling and liquid-supplying refrigerating device

Technical Field

The utility model relates to a refrigerating plant technical field, concretely relates to directly spout little power full liquid and supply liquid refrigerating plant.

Background

The refrigeration system is generally divided into a direct expansion type and a flooded type, the direct expansion type utilizes a thermal expansion valve or an electronic expansion valve to reduce pressure, expand and refrigerate, and supplies liquid for gas-liquid mixture (namely, the refrigerant for gas-liquid mixture is provided for cooling equipment), the direct expansion type is generally used in small and medium-sized refrigeration systems, the filling amount of the refrigerant is small, the superheat degree is 7K to 10K, liquid return is easy to generate (namely, the refrigerant conveyed back to a compressor has liquid refrigerant), and the refrigeration efficiency is low after the liquid return is generated.

The flooded type is to utilize low-pressure circulation barrel and circulating pump to supply liquid for refrigeration, the refrigerant utilizes solenoid valve or electric control valve to step down and expand, reduces to the settlement temperature, gets into low-pressure circulation barrel, and gaseous state refrigerant is taken away by compressor, and low temperature liquid state refrigerant leaves, is sent to in the cooling equipment such as air-cooler or cold calandria by low temperature circulating pump, becomes gaseous state refrigerant after cooling and converges into low-pressure circulation barrel, then is taken away by compressor again. The flooded system is generally used in medium and large systems or quick-freezing systems, the superheat degree is generally 4K to 6K, and energy and electricity are saved. However, the problems of more equipment, large floor area, high manufacturing cost, large refrigerant charge amount, poor oil return effect (excessive liquid lubricating oil is reserved in the low-pressure circulating barrel) and the like exist, after the oil return effect is poor, the cooling capacity is affected, and the energy consumption is increased (after the liquid refrigerant doped with the lubricating oil enters the cooling equipment, the lubricating oil can be combined with the inner wall of the cooling equipment to form a layer of oil film, so that the cooling efficiency is reduced).

The invention combines the advantages of a direct expansion type refrigerating device and a flooded type refrigerating device, designs a direct expansion type micro-power flooded liquid supply refrigerating device, which comprises a liquid supply gas-liquid separator, a gas return-liquid separator, a high-pressure liquid storage tank, a liquid return heat regenerator, a low-temperature liquid level meter, an electric automatic control valve and other devices, is suitable for various refrigerating systems such as large, medium and small refrigerating systems, quick freezing and the like, has less refrigerant filling, can control the superheat degree to be 4K to 6K, occupies small area, directly assembles when leaving a factory, is convenient to install, has no concern about oil return, can increase the refrigerating capacity of a refrigerating unit to the maximum extent, reduces energy consumption, and achieves better energy-saving refrigerating effect.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming and directly puffing the formula refrigerating plant during operation among the prior art and producing back liquid easily, and flooded refrigerating plant's refrigerant volume of filling is big, technical defect with high costs to provide one kind and combine on the formula basis of directly puffing the straight little power of puffing and supply liquid refrigerating plant of both advantages.

Therefore, the utility model provides a directly puff formula micro-power full liquid supplies liquid refrigerating plant, include:

the liquid supply gas-liquid separator is arranged at the downstream of the expansion valve and used for receiving the refrigerant decompressed by the expansion valve and carrying out gas-liquid separation on the refrigerant;

the cold dispersing equipment is arranged at the downstream of the liquid supply gas-liquid separator, and the refrigerant input end is communicated with the lower part of the liquid supply gas-liquid separator through a liquid discharge pipe;

the intermediate gas-liquid separator is arranged at the downstream of the cold dispersing equipment, is provided with a gas inlet communicated with the refrigerant output end, and is used for receiving the refrigerant after cold dispersing and performing gas-liquid separation on the refrigerant;

the compressor air return pipeline is communicated with an air outlet of the intermediate gas-liquid separator;

and one end of the liquid return pipe is communicated with the bottom of the middle gas-liquid separator, the other end of the liquid return pipe is communicated with the liquid supply gas-liquid separator, and a liquid supply pump is arranged in the middle of the liquid return pipe.

As a preferable mode, the liquid-feeding gas-liquid separator includes a gas discharge structure including:

the exhaust valve comprises a first valve body connected with a floating ball assembly and an annular end cover arranged above the first valve body, and the annular end cover covers the upper part of an end opening of the liquid supply gas-liquid separator;

the first wire mesh demister is of a cylindrical structure with an opening in the middle, the top of the first wire mesh demister is fixed on the exhaust valve, and the first valve body penetrates into the first wire mesh demister for a certain distance;

the gland is fixedly covered on the annular end cover;

the exhaust pipe is fixedly arranged on the annular end cover in a penetrating way, one end of the exhaust pipe is communicated with the liquid supply gas-liquid separator, and the other end of the exhaust pipe is communicated with the gas return pipeline of the compressor or the intermediate gas-liquid separator;

when the liquid level rises, the floating ball component rises to push the first valve body to close the exhaust pipe; when the liquid level descends, the floating ball assembly descends to pull the first valve body to open the exhaust pipe.

Preferably, a partition is fixedly disposed at a top of the intermediate gas-liquid separator, and is disposed between the gas inlet and the gas outlet and extends for a certain length.

Preferably, the device further comprises a second wire mesh demister arranged between the partition plate and the inner wall of the intermediate gas-liquid separator, and the partition plate, the second wire mesh demister and part of the inner wall of the intermediate gas-liquid separator form a relatively closed space, and the exhaust port is arranged at a position communicated with the closed space.

Preferably, a portion of the compressor air return pipeline extending from the air outlet to the interior of the intermediate gas-liquid separator forms a U-shaped bend, an upward end of the U-shaped bend is an open end, and a bottom opening is formed at the bottom of the U-shaped bend.

Preferably, the inner diameter of the bottom opening is 1/5-2/3 of the inner diameter of the opening of the U-shaped bent end.

As a preferred scheme, a liquid discharge opening is formed in the bottom of the middle gas-liquid separator, a ball float valve is installed at the liquid discharge opening, the liquid return pipe is arranged at the downstream of the ball float valve, and an electromagnetic valve is arranged on the liquid return pipe.

As a preferable scheme, the method further comprises the following steps:

the heat regenerator is arranged between the expansion valve and the high-pressure liquid storage tank;

and one end of the return air and oil return pipe is communicated with the ball float valve, the other end of the return air and oil return pipe is communicated with a return air pipeline of the compressor, and the middle of the return air and oil return pipe penetrates through the heat regenerator to exchange heat.

As a preferred scheme, the system also comprises a high-pressure liquid supply electromagnetic valve which is arranged between the expansion valve and the liquid return device;

and/or, also include the liquid return backheating electromagnetic valve, set up on the said return air returns the oil pipe;

and the temperature sensor is arranged at the downstream of the heat regenerator and used for outputting temperature data to the liquid return heat regeneration electromagnetic valve so as to automatically control the delivery quantity of the refrigerant in the gas return oil return pipe.

As a preferable scheme, the device further comprises a liquid level monitoring device, wherein the liquid level monitoring device is used for monitoring the liquid level in the intermediate gas-liquid separator and controlling the liquid supply pump to be opened and closed based on liquid level data.

The technical scheme provided by the utility model, following advantage has:

the utility model discloses a directly expand formula micro-power liquid full supply liquid refrigerating plant, is the improvement on traditional directly expand formula gas-liquid supply refrigerating plant basis, through improving, no longer is the refrigerant of gas-liquid mixture to the cooling equipment that looses supplies, but pure liquid state refrigerant, and pure liquid state refrigerant changes evenly distributed in the cooling equipment that looses, more can full play the cooling effect that looses of cooling equipment; the refrigerant from the equipment output of loosing cold is not directly carried to the compressor return gas pipeline, but is separated again through the middle gas-liquid separator, thereby solving the problem of liquid impact often encountered by the traditional direct expansion type refrigerating device, improving the operation stability of the equipment, prolonging the service life of the equipment, promoting the refrigeration efficiency and reducing the energy consumption.

Drawings

In order to more clearly illustrate the technical solutions in the prior art or the embodiments of the present invention, the drawings used in the description of the prior art or the embodiments are briefly introduced below.

Fig. 1 is a schematic view of the overall structure of the direct expansion type micro-power liquid-filled liquid-supply refrigerating device of the present invention.

Reference numerals: 1. a liquid-feeding gas-liquid separator; 11. a liquid discharge pipe; 12. an exhaust valve; 13. a first valve body; 14. an annular end cap; 15. a first wire mesh demister; 16. a gland; 17. an exhaust pipe; 2. an expansion valve; 3. an intermediate gas-liquid separator; 31. an air inlet; 32. an exhaust port; 33. a partition plate; 34. a second wire mesh demister; 35. a liquid discharge opening; 36. a float valve; 37. a liquid level monitoring device; 4. a compressor return air conduit; 41. the bottom is open; 5. a liquid return pipe; 51. a liquid supply pump; 52. an electromagnetic valve; 6. a heat regenerator; 7. a high-pressure liquid storage tank; 8. an air return and oil return pipe; 81. a liquid returning and heat returning electromagnetic valve; 9. a high-pressure liquid supply electromagnetic valve.

Detailed Description

In order to make the technical solution better understood by those skilled in the art, the technical solution in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments that can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application.

It is noted that the terms first, second and the like in the claims and in the description of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application can be understood by those skilled in the art as appropriate. In addition, the term "plurality" shall mean two as well as more than two. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Examples

The present embodiment provides a direct expansion type micro-power liquid-full supply refrigeration device, as shown in fig. 1, including: the system comprises a liquid supply gas-liquid separator 1, a cold dispersing device (not shown in the figure), an intermediate gas-liquid separator 3, a compressor gas return pipeline 4, a liquid return pipe 5, a high-pressure liquid storage tank 7, an expansion valve 2, and certainly further comprises conventional devices commonly used in refrigeration systems such as a compressor, a condenser and the like, and further description is omitted here, and only the improved parts on the basis of the conventional refrigeration devices are described.

As shown in fig. 1, the liquid-feeding gas-liquid separator 1 is disposed downstream of the expansion valve 2, and receives the refrigerant depressurized by the expansion valve 2 and performs gas-liquid separation of the refrigerant; the cold dispersing equipment is arranged at the downstream of the liquid supply gas-liquid separator 1, and the input end of the refrigerant is communicated with the lower part of the liquid supply gas-liquid separator 1 through a liquid discharge pipe 11 and is used for receiving the pure liquid refrigerant, exchanging heat in the cold dispersing equipment and conveying cold energy outwards; the intermediate gas-liquid separator 3 is arranged at the downstream of the cooling equipment, is provided with a gas inlet 31 communicated with the refrigerant output end, and is used for receiving the cooled refrigerant and performing gas-liquid separation on the refrigerant; the compressor gas return pipeline 4 is communicated with the exhaust port 32 of the intermediate gas-liquid separator 3; one end of the liquid return pipe 5 is communicated with the bottom of the intermediate gas-liquid separator 3, the other end is communicated with the liquid supply gas-liquid separator 1, and the liquid supply pump 51 is arranged in the middle.

The operation process of the direct expansion type micro-power full liquid supply refrigeration device in the embodiment is as follows: the high-pressure refrigerant is decompressed after being expanded by an expansion valve 2 and enters a liquid supply gas-liquid separator 1; the liquid-supplying gas-liquid separator 1 temporarily stores the gas-liquid mixed refrigerant and then performs gas-liquid separation; the gaseous refrigerant is conveyed upwards through an exhaust structure arranged at the upper port of the liquid-supply gas-liquid separator 1 and is conveyed to a gas return pipeline 4 of the compressor or an intermediate gas-liquid separator 3; the liquid refrigerant enters the cooling equipment through a liquid discharge pipe 11 arranged at the bottom of the liquid supply gas-liquid separator 1, is changed into a gas-liquid mixed refrigerant (mainly in a gas state) after heat exchange in the cooling equipment, and then is conveyed to the intermediate gas-liquid separator 3; the intermediate gas-liquid separator 3 performs secondary gas-liquid separation on the received gas-liquid mixed refrigerant; the gaseous refrigerant is conveyed to the compressor air return pipeline 4 through the exhaust port 32, and the liquid refrigerant is temporarily stored in the intermediate gas-liquid separator 3; when a certain amount of refrigerant is reached, the liquid supply pump 51 is started to re-convey the liquid refrigerant temporarily stored in the intermediate gas-liquid separator 3 to the liquid supply gas-liquid separator 1, so as to perform heat exchange inside the cooling device again.

Specifically, the liquid-feeding gas-liquid separator 1 includes an exhaust structure including an exhaust valve 12, a first wire mesh demister 15, a gland 16, and an exhaust pipe 17, wherein: the exhaust valve 12 comprises a first valve body 13 connected with a floating ball assembly and an annular end cover 14 arranged above the first valve body 13, and the annular end cover 14 covers the opening of the end part of the liquid supply gas-liquid separator 1; the first wire mesh demister 15 is a cylindrical structure with an opening in the middle, the top of the first wire mesh demister 15 is fixed on the exhaust valve 12, and the first valve body 13 extends into the first wire mesh demister 15 for a certain distance; the gland 16 is fixedly covered on the annular end cover 14; the exhaust pipe 17 is fixedly arranged on the annular end cover 14 in a penetrating way, one end of the exhaust pipe is communicated with the liquid supply gas-liquid separator 1, and the other end of the exhaust pipe is communicated with the gas return pipeline 4 of the compressor or communicated with the middle gas-liquid separator 3.

When the liquid level rises, the floating ball component rises to push the first valve body 13 to close the exhaust pipe 17, so that the liquid refrigerant is prevented from being output from the exhaust pipe 17; when the liquid level drops, the floating ball component drops to pull the first valve body 13 to open the exhaust pipe 17, so that the gaseous refrigerant is continuously output outwards. It should be noted that the vent valve 12 is a conventional float valve of prior art construction, which is commercially available.

The intermediate gas-liquid separator 3 has a partition 33 fixed to the top thereof, and is disposed between the gas inlet 31 and the gas outlet 32 and extended by a predetermined length. The partition 33 functions to separate the inlet port 31 and the outlet port 32 as much as possible, and to prevent the liquid refrigerant introduced from the inlet port 31 from being discharged from the outlet port 32. Further, a second wire mesh demister 34 is further provided inside the intermediate gas-liquid separator 3, specifically at a position between the partition 33 and the inner wall of the intermediate gas-liquid separator 3, and such that the partition 33, the second wire mesh demister 34 and a part of the inner wall of the intermediate gas-liquid separator 3 form a relatively closed space, and the gas discharge port 32 is provided at a position communicating with the closed space. The advantage of this arrangement is that the location in communication with the exhaust port 32 is enclosed as a relatively closed space, and the sputtered liquid refrigerant cannot easily be discharged from the location of the exhaust port 32; even if the refrigerant is gaseous, the refrigerant needs to be filtered by the wire mesh demister 34 to filter liquid drops, and then the refrigerant can enter the closed space and is further discharged to the compressor air return pipeline 4 from the air outlet 32; thereby ensuring that substantially all of the refrigerant entering the compressor return line 4 is gaseous refrigerant.

As a preferable design, a portion of the compressor return air duct 4 extending from the air outlet 32 into the intermediate gas-liquid separator 3 forms a U-shaped bend, an upward end of the U-shaped bend is an open end, and a bottom opening 41 is provided at a bottom of the U-shaped bend. The design is to deal with the situation that the liquid level in the middle gas-liquid separator 3 is too high due to special situations, when the liquid level in the middle gas-liquid separator 3 is too high and exceeds the second wire mesh demister 34 or even exceeds the bottom opening 41, a large amount of liquid refrigerant directly enters the compressor air return pipeline 4 and directly enters the compressor, and the compressor is greatly damaged if a U-shaped bend is not arranged; after the U-shaped bend and the bottom opening 41 are arranged, the gaseous refrigerant enters from the upward end opening of the U-shaped bend, and the liquid refrigerant enters from the bottom opening 41, so that the refrigerant entering the air return pipeline 4 of the compressor is the mixture of a large amount of gaseous refrigerant and a small amount of liquid refrigerant, and the compressor is generally not greatly damaged by the contained small amount of liquid refrigerant; that is, the design can reduce the amount of the liquid refrigerant sucked into the air return pipeline 4 of the compressor and reduce the damage to the compressor when the liquid level of the liquid refrigerant in the intermediate gas-liquid separator 3 is too high.

Preferably, the inner diameter of the bottom opening 41 is 1/5-2/3 of the inner diameter of the opening of the U-shaped bent end, and the proportion of the liquid refrigerant input into the return air pipeline 4 of the compressor can be controlled.

The bottom of the middle gas-liquid separator 3 is provided with a liquid discharge opening 35, a ball float 36 is mounted at the position of the liquid discharge opening 35, a liquid return pipe 5 is arranged at the downstream of the ball float 36, and an electromagnetic valve 52 is arranged on the liquid return pipe 5. And a liquid level monitoring device 37 for monitoring the liquid level in the intermediate gas-liquid separator 3 and controlling the liquid supply pump 51 to be opened and closed based on the liquid level data. When the liquid level in the intermediate gas-liquid separator 3 is higher than the upper limit of the liquid level monitoring device 37, sending a liquid discharge signal to the liquid supply pump 51, and starting the liquid supply pump 51 to convey the liquid refrigerant in the intermediate gas-liquid separator 3 to the liquid supply gas-liquid separator 1; when the liquid level in the intermediate gas-liquid separator 3 is lower than the lower limit of the liquid level detection device 37, a signal is sent to the liquid feed pump 51, and the liquid feed pump 51 stops pumping the liquid refrigerant to the liquid feed gas-liquid separator 1.

As an improved technical scheme, the direct expansion type micro-power liquid-full liquid supply refrigerating device of the embodiment further comprises a heat regenerator 6 and an air return oil return pipe 8; the heat regenerator 6 is arranged between the expansion valve 2 and the high-pressure liquid storage tank 7; one end of the return air and oil return pipe 8 is communicated with the ball float valve 36, the other end is communicated with the return air pipeline 4 of the compressor, and the middle of the return air and oil return pipe passes through the heat regenerator 6 for heat exchange. That is, in the technical solution of the present embodiment, the liquid refrigerant separated by the intermediate gas-liquid separator 3 may be used to further cool the refrigerant sent from the high-pressure liquid storage tank 7 to the expansion valve 2, so as to improve the cooling efficiency.

As a preferred technical scheme, the system also comprises a liquid return regenerative electromagnetic valve 81 and a temperature sensor; wherein, the liquid return backheating electromagnetic valve 81 is arranged on the air return and oil return pipe 8; the temperature sensor is arranged at the downstream of the heat regenerator 6 and used for outputting temperature data to the liquid return heat regeneration electromagnetic valve 81 so as to automatically control the delivery amount of the refrigerant in the return air and return oil pipe 8.

As a preferable configuration, an oil return opening may be provided in the liquid-gas separator 1 at a position below the first wire demister 15, and the refrigerant subjected to gas-liquid separation in the liquid-gas separator 1 is lighter in weight and therefore more likely to float upward, and can be separated from this position through the oil return opening, thereby improving oil return efficiency.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the present invention.

Claims (10)

1. A directly puffing type micro-power liquid full supply refrigeration device is characterized by comprising:

the liquid supply gas-liquid separator (1) is arranged at the downstream of the expansion valve (2) and is used for receiving the refrigerant decompressed by the expansion valve (2) and carrying out gas-liquid separation on the refrigerant;

the cold dispersing equipment is arranged at the downstream of the liquid supply gas-liquid separator (1), and the input end of the refrigerant is communicated with the lower part of the liquid supply gas-liquid separator (1) through a liquid discharge pipe (11);

the intermediate gas-liquid separator (3) is arranged at the downstream of the cooling equipment, is provided with a gas inlet (31) communicated with the refrigerant output end, and is used for receiving the cooled refrigerant and performing gas-liquid separation on the refrigerant;

a compressor return air duct (4) communicating with an exhaust port (32) of the intermediate gas-liquid separator (3);

and one end of the liquid return pipe (5) is communicated with the bottom of the middle gas-liquid separator (3), the other end of the liquid return pipe is communicated with the liquid supply gas-liquid separator (1), and a liquid supply pump (51) is arranged in the middle of the liquid return pipe.

2. The direct-expansion type micro-power liquid-filled liquid supply refrigerating device according to claim 1, wherein the liquid supply gas-liquid separator (1) comprises a gas exhaust structure, and the gas exhaust structure comprises:

the exhaust valve (12) comprises a first valve body (13) connected with a floating ball assembly and an annular end cover (14) arranged above the first valve body (13), and the annular end cover (14) covers the opening at the end part of the liquid supply gas-liquid separator (1);

the first wire mesh demister (15) is of a cylindrical structure with an opening in the middle, the top of the first wire mesh demister is fixed on the exhaust valve (12), and the first valve body (13) penetrates into the first wire mesh demister (15) for a certain distance;

the gland (16) is fixedly arranged on the annular end cover (14);

the exhaust pipe (17) is fixedly arranged on the annular end cover (14) in a penetrating way, one end of the exhaust pipe is communicated with the liquid supply gas-liquid separator (1), and the other end of the exhaust pipe is communicated with the compressor gas return pipeline (4) or the middle gas-liquid separator (3);

when the liquid level rises, the floating ball component rises to push the first valve body (13) to close the exhaust pipe (17); when the liquid level descends, the floating ball component descends to pull the first valve body (13) to open the exhaust pipe (17).

3. The direct expansion type micro-power liquid-filled refrigeration device according to claim 1, wherein: the top of the middle gas-liquid separator (3) is fixedly provided with a partition plate (33) which is arranged between the air inlet (31) and the air outlet (32) and extends for a certain length.

4. The direct expansion type micro-power liquid full supply refrigeration device according to claim 3, characterized in that: and the device also comprises a second wire mesh demister (34) which is arranged between the clapboard (33) and the inner wall of the intermediate gas-liquid separator (3), and the clapboard (33), the second wire mesh demister (34) and part of the inner wall of the intermediate gas-liquid separator (3) form a relatively closed space, and the exhaust port (32) is arranged at a position communicated with the closed space.

5. The direct-expansion micro-power liquid-filled liquid-supplied refrigerating device according to claim 4, wherein: compressor return air pipe way (4) follow gas vent (32) stretch into to the inside part of middle vapour and liquid separator (3) forms the U type and bends, the curved ascending tip of U type is the open end, just is in the curved bottom of U type is equipped with bottom opening (41).

6. The direct expansion type micro-power liquid full supply refrigeration device according to claim 5, characterized in that: the inner diameter of the bottom opening (41) is 1/5-2/3 of the inner diameter of the opening of the U-shaped bent end.

7. The direct expansion type micro-power liquid-filled refrigeration device according to claim 1, wherein: the bottom of middle vapour and liquid separator (3) is equipped with flowing back opening (35), ball-cock assembly (36) are installed to flowing back opening (35) position, liquid return pipe (5) set up the low reaches of ball-cock assembly (36), just be equipped with solenoid valve (52) on liquid return pipe (5).

8. The straight-expanded micro-power liquid-filled refrigeration device according to claim 7, further comprising:

the heat regenerator (6) is arranged between the expansion valve (2) and the high-pressure liquid storage tank (7);

and one end of the return air and oil return pipe (8) is communicated with the ball float valve (36), the other end of the return air and oil return pipe is communicated with the return air pipeline (4) of the compressor, and the middle of the return air and oil return pipe passes through the heat regenerator (6) to exchange heat.

9. The direct-expansion micro-power liquid-filled liquid-supplied refrigerating device according to claim 8, wherein: the system also comprises a high-pressure liquid supply electromagnetic valve (9) which is arranged between the expansion valve (2) and the heat regenerator (6);

and/or the device also comprises a liquid return heat recovery electromagnetic valve (81) which is arranged on the air return oil return pipe (8);

and the temperature sensor is arranged at the downstream of the heat regenerator (6) and used for outputting temperature data to the liquid return heat return electromagnetic valve (81) so as to automatically control the delivery quantity of the refrigerant in the air return oil return pipe (8).

10. The direct expansion type micro-power liquid-filled refrigeration device according to claim 1, wherein: the device also comprises a liquid level monitoring device (37) which is used for monitoring the liquid level in the middle gas-liquid separator (3) and controlling the liquid supply pump (51) to be opened and closed based on liquid level data.

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