CN218544873U

CN218544873U - Low-refrigerant-filling-amount flooded refrigerating device for rack calandria evaporator of quick-freezing warehouse

Info

Publication number: CN218544873U
Application number: CN202221865337.5U
Authority: CN
Inventors: 霍广东; 金伟
Original assignee: Yixing City Ice Source Refrigeration Equipment Ltd
Current assignee: Yixing City Ice Source Refrigeration Equipment Ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2023-02-28
Anticipated expiration: 2032-07-20

Abstract

The utility model discloses a low refrigerant filling capacity flooded refrigerating plant for a rack calandria evaporator of a quick-freezing warehouse, which comprises an oil distiller, a gas-liquid separator, a first evaporator and a second evaporator which are arranged up and down, wherein the first evaporator and the second evaporator both adopt a liquid inlet mode of feeding in and discharging out from bottom to top; the interior of the gas-liquid separator is divided into an upper cavity and a lower cavity which are communicated through an overflow pipe; the liquid outlet of oil distiller passes through the feed pipe and is connected with the upper portion cavity, the liquid outlet of upper portion cavity is connected with the inlet of first evaporimeter, the liquid outlet of lower part cavity is connected with the inlet of second evaporimeter, the liquid outlet of first evaporimeter and second evaporimeter all is connected with the upper portion cavity, and this system's refrigerant charge volume is low, and the system oil return is simple stable, the compressor is difficult for appearing the liquid hammer phenomenon, and the system operation is more stable.

Description

Low-refrigerant-filling-amount flooded refrigerating device for rack and tube bank evaporator of quick-freezing warehouse

Technical Field

The utility model relates to a flooded refrigeration technology field especially relates to a flooded refrigerating plant of low refrigerant charge for quick-freeze storehouse shelf calandria evaporator.

Background

The existing full-liquid type refrigerating system of the shelf calandria evaporator of the quick-freeze warehouse is basically divided into two types according to the liquid supply mode: gravity liquid supply and mechanical pump forced liquid supply; the existing gravity liquid supply and mechanical pump liquid supply refrigerating system has the following defects:

1. the refrigerant filling amount in the evaporator is large and accounts for 50-70% of the volume of the evaporator, and can even reach 80% under low load; the selection of the types of the system auxiliary components such as the liquid storage device, the gas separator, the low-pressure circulating liquid storage barrel and the like is also large, and the overall cost of the equipment is high;

2. when a mechanical pump is used for supplying liquid, the problems of cavitation, no liquid feeding and the like are easy to occur, so that the reliability of a refrigerating system is reduced;

3. when a gravity liquid supply system is adopted, the liquid level of the gas-liquid separator needs to exceed the highest position of the evaporator by 0.5m, so that the mounting position of the gas-liquid separator is relatively higher, and the mounting cost of the gas-liquid separator is increased; because of the increase of the height of the liquid column in the evaporator, the static pressure at the lower part of the evaporator is increased, so that the evaporation temperature is increased, the heat exchange capacity of the evaporator is reduced, the heat load is large when the quick-freezing warehouse is just loaded, and the liquid impact of the compressor is easy to occur.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defect of background art, providing a refrigerant charge is low, and the system oil return is simple stable, the compressor is difficult for appearing the liquid attack phenomenon, and the system moves more stable full liquid formula refrigerating plant of a quick-freeze storehouse shelf calandria evaporimeter low refrigerant charge.

In order to realize the purpose of the utility model, the technical proposal of the utility model is that:

the full-liquid type refrigerating device with low refrigerant filling amount for the rack calandria evaporator of the quick-freezing warehouse comprises an oil distiller, a gas-liquid separator, a first evaporator and a second evaporator which are arranged up and down, wherein the first evaporator and the second evaporator both adopt a liquid inlet mode of feeding in and discharging out from the bottom; the interior of the gas-liquid separator is divided into an upper cavity and a lower cavity which are communicated through an overflow pipe; the liquid outlet of the oil distiller is connected with the upper cavity through a liquid supply pipe, the liquid outlet of the upper cavity is connected with the liquid inlet of the first evaporator, the liquid outlet of the lower cavity is connected with the liquid inlet of the second evaporator, and the liquid outlets of the first evaporator and the second evaporator are both connected with the upper cavity; the top of the gas-liquid separator is also provided with an exhaust port, and the exhaust port is connected with an air suction port of the compressor through an air return pipe; the air outlet at the top of the oil distiller is connected with the air suction port of the compressor through an air outlet pipe, and the liquid supply pipe is provided with an electronic expansion valve.

Preferably, the refrigerant charge in the first evaporator is 33% to 35% of its volume.

Preferably, the refrigerant charge in the second evaporator is 33% to 35% of its volume.

Preferably, a liquid level sensor is further arranged on the outer wall of the lower cavity of the gas-liquid separator.

Preferably, the liquid level in the upper chamber of the gas-liquid separator is 1/3 of the total height of the first evaporator.

Preferably, the liquid level in the lower chamber of the gas-liquid separator is 1/3 of the total height of the second evaporator.

The utility model has the advantages that:

firstly, the method comprises the following steps: the refrigerant charging amount in the first evaporator and the second evaporator of the system is low, and the purchasing cost of auxiliary components such as a liquid storage device, a gas-liquid separator and the like is reduced; a mechanical pump is not needed, and the oil return of the system is simple and stable; the static pressure of liquid columns in the first evaporator and the second evaporator is low, the influence on the heat exchange of the first evaporator and the second evaporator is small, the liquid impact phenomenon of a compressor is not easy to occur, and the system operation is more stable;

secondly, the method comprises the following steps: a liquid level sensor is arranged, and a liquid level signal automatically adjusts the opening degree of the electronic expansion valve after being calculated by a PLC (programmable logic controller), so that the liquid level of the lower chamber is always maintained at a set height;

thirdly, the steps of: the gas-liquid separator and the rack calandria are installed in the same storehouse, and heat preservation is not needed.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1 is an oil distiller, 2 is a gas-liquid separator, 2.1 is an upper chamber, 2.2 is a lower chamber, 2.3 is an overflow pipe, 2.4 is a level sensor, 3 is a first evaporator, 4 is a second evaporator, 5 is a liquid supply pipe, 5.1 is an electronic expansion valve, 6 is a gas return pipe, and 7 is a gas outlet pipe.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

The low refrigerant filling capacity flooded refrigeration device for the rack calandria evaporator of the quick-freezing warehouse comprises an oil distiller 1, a gas-liquid separator 2, a first evaporator 3 and a second evaporator 4 which are arranged up and down, wherein the first evaporator 3 and the second evaporator 4 both adopt a liquid inlet mode of feeding in and discharging out from bottom to top; the interior of the gas-liquid separator 2 is divided into an upper chamber 2.1 and a lower chamber 2.2 which are communicated with each other through an overflow pipe 2.3; the liquid outlet of the oil distiller 1 is connected with the upper cavity 2.1 through a liquid supply pipe 5, the liquid outlet of the upper cavity 2.1 is connected with the liquid inlet of the first evaporator 3, the liquid outlet of the lower cavity 2.2 is connected with the liquid inlet of the second evaporator 4, and the liquid outlets of the first evaporator 3 and the second evaporator 4 are both connected with the upper cavity 2.1; the top of the gas-liquid separator 2 is also provided with an exhaust port which is connected with a suction port of the compressor through a gas return pipe 6; the air outlet at the top of the oil distiller 1 is connected with the air suction port of the compressor through an air outlet pipe 7, and an electronic expansion valve 5.1 is arranged on the liquid supply pipe 5.

Preferably, the refrigerant charge in the first evaporator 3 is 33% to 35% of the volume thereof.

Preferably, the refrigerant charge in the second evaporator 4 is 33% to 35% of the volume thereof.

Preferably, a liquid level sensor 2.4 is further arranged on the outer wall of the lower chamber 2.2 of the gas-liquid separator 2.

Preferably, the liquid level in the upper chamber 2.1 of the gas-liquid separator 2 is 1/3 of the total height of the first evaporator 3.

Preferably, the liquid level in the lower chamber 2.2 of the gas-liquid separator 2 is 1/3 of the total height of the second evaporator 4.

The specific refrigeration operation flow is as follows:

liquid refrigerant from a high-pressure liquid reservoir (not shown in the figure) enters the oil distiller 1, is throttled and decompressed by an electronic expansion valve 5.1, enters an upper cavity 2.1 of the gas-liquid separator 2, is merged with the unevaporated liquid refrigerant from the first evaporator 3 and the second evaporator 4, so that the liquid level in the upper cavity 2.1 is gradually increased, the liquid refrigerant flows into a lower cavity 2.2 by gravity after passing through an overflow pipe 2.3 in the gas-liquid separator 2, when the liquid level of the lower cavity 2.2 is close to a set height, the opening degree of the electronic expansion valve 5.1 is automatically adjusted by a signal of a liquid level sensor 2.4 after PLC operation, and the liquid level of the lower cavity 2.2 is always maintained at the set height; the liquid refrigerant in the upper chamber 2.1 of the gas-liquid separator 2 enters the first evaporator 3 to absorb heat and evaporate and then returns to the upper chamber 2.1, the liquid refrigerant in the lower chamber 2.2 of the gas-liquid separator 2 enters the second evaporator 4 to absorb heat and evaporate and then returns to the upper chamber 2.1, after gas-liquid separation, the gas refrigerant returns to an air suction port of a compressor (not shown in the figure) through a gas return pipe 6 to be compressed, and the operation is repeated in cycles and in a reciprocating cycle.

The specific process of returning the refrigeration oil to the compressor is as follows:

the oil liquid mixture enters the oil distiller 1, and refrigerant liquid is evaporated into gas and returns to a suction port of a compressor (not shown in the figure) through an air outlet pipe 7 with refrigerating oil.

The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Claims

1. Full liquid formula refrigerating plant of low refrigerant charge for quick-freeze storehouse shelf calandria evaporator, its characterized in that: the device comprises an oil distiller (1), a gas-liquid separator (2), and a first evaporator (3) and a second evaporator (4) which are arranged up and down, wherein the first evaporator (3) and the second evaporator (4) both adopt a liquid inlet mode of feeding in and discharging out from bottom to top; the interior of the gas-liquid separator (2) is divided into an upper chamber (2.1) and a lower chamber (2.2), and the upper chamber and the lower chamber are communicated through an overflow pipe (2.3); the liquid outlet of the oil distiller (1) is connected with the upper cavity (2.1) through a liquid supply pipe (5), the liquid outlet of the upper cavity (2.1) is connected with the liquid inlet of the first evaporator (3), the liquid outlet of the lower cavity (2.2) is connected with the liquid inlet of the second evaporator (4), and the liquid outlets of the first evaporator (3) and the second evaporator (4) are both connected with the upper cavity (2.1); the top of the gas-liquid separator (2) is also provided with an exhaust port, and the exhaust port is connected with a suction port of the compressor through an air return pipe (6); the air outlet at the top of the oil distiller (1) is connected with an air suction port of a compressor through an air outlet pipe (7), and an electronic expansion valve (5.1) is arranged on the liquid supply pipe (5).

2. The flooded type refrigerating plant with low refrigerant filling amount for the shelf rack pipe evaporator of the quick freezer as claimed in claim 1, wherein: the refrigerant filling amount in the first evaporator (3) accounts for 33% -35% of the volume of the first evaporator.

3. The flooded type refrigerating plant with low refrigerant filling amount for the rack and drain pipe evaporator of the quick freezer as claimed in claim 1, wherein the flooded type refrigerating plant comprises: the refrigerant filling amount in the second evaporator (4) accounts for 33% -35% of the volume of the second evaporator.

4. The flooded type refrigerating plant with low refrigerant filling amount for the shelf rack pipe evaporator of the quick freezer as claimed in claim 1, wherein: and a liquid level sensor (2.4) is also arranged on the outer wall of the lower cavity (2.2) of the gas-liquid separator (2).

5. The flooded type refrigerating plant with low refrigerant filling amount for the shelf rack pipe evaporator of the quick freezer as claimed in claim 1, wherein: the liquid level in the upper chamber (2.1) of the gas-liquid separator (2) is 1/3 of the total height of the first evaporator (3).

6. The flooded type refrigerating plant with low refrigerant filling amount for the shelf rack pipe evaporator of the quick freezer as claimed in claim 1, wherein: the liquid level in the lower chamber (2.2) of the gas-liquid separator (2) is 1/3 of the total height of the second evaporator (4).