CN211854514U - CO2 barrel pump unit with pressure maintaining machine - Google Patents

Abstract

The utility model relates to a take CO of pressure maintenance machine₂A barrel pump assembly, comprising: maintenance unit, CO₂Circulation bucket, switch board, automatic oil return module, circulation pump package and public base, CO₂The circulating barrel, the control cabinet, the automatic oil return module and the circulating pump set are respectively connected to the public base, and the maintaining unit and the automatic oil return moduleThe block and the circulating pump set are respectively connected with the control cabinet; the maintenance unit and CO₂The circulating barrels are connected; the automatic oil return module is connected with CO in one way₂The circulating barrel is connected, and the other path of the automatic oil return module is connected with CO through the main liquid supply module₂The circulating barrels are connected; the main liquid supply module is connected with the control cabinet; the CO is₂The circulating barrel is connected with an evaporator through a circulating pump group. The unit of the utility model is designed in a block-prizing way, the whole set of unit is placed on the public base, the design is compact, and the vibration is small; the machine is of a prying design, and is convenient to transport and install.

Description

CO with pressure maintaining machine2Barrel pump unit

Technical Field

The utility model relates to a pump assembly technical field especially relates to a take CO of pressure maintenance machine₂A barrel pump unit.

Background

Based on environmental protection considerations, freon refrigerants are being phased out, low GWP refrigerants, such as natural gas (NH)₃、CO₂HCs, etc.), HFOs, would be a selection trend; due to the adjustment of the selection of the refrigerant, correspondingly matched products are developed successively; CO2₂The refrigerant is an environment-friendly natural refrigerant, ODP (optical density distribution) is 0, GWP (global warming potential) is 1, and the refrigerant has high refrigerating efficiency, is easy to obtain and low in price; therefore, in recent years, more refrigeration systems have adopted CO₂As a refrigerant.

Most of the traditional refrigerating units are developed for refrigerating working media based on ammonia or Freon, and CO is used₂As a refrigerating working medium, compared with ammonia, Freon and the like, the design pressure of matched equipment needs to be improved, and the existing equipment needs to be upgraded.

The patent number is 201520689490.0, the patent name is a single-barrel single-pump barrel pump unit, which discloses the following technology: it includes that low pressure circulation bucket module, liquid level observe and control module, storehouse supply liquid module and oil return heating module, low pressure circulation bucket module both sides are provided with liquid level observe and control module and oil return heating module, low pressure circulation bucket module downside is provided with the storehouse and supplies the liquid module, low pressure circulation bucket module includes low pressure circulation bucket and pipeline, pipeline one side is provided with the inlet, low pressure circulation bucket upside is provided with leakage fluid dram, steam inlet and return steam port, return steam port one side is provided with the relief valve, and this unit is the freon barrel pump, has not satisfied and has adopted CO barrel pump₂The pressure requirement as a refrigeration working medium; the unit is not provided with a maintaining unit, and CO is generated when power failure occurs accidentally, system failure occurs or no cold energy is required in a short time₂The pressure of the circulating barrel can continuously rise, and if the pressure of the circulating barrel cannot be maintained, the pressure can only be increasedCO₂Discharge of the system to cause CO₂And (4) loss.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In order to solve the above problems in the prior art, the utility model provides a take CO2 barrel pump unit of pressure maintenance machine has simple structure, compact structure, and the vibration is little, the characteristics of being convenient for installation and transportation.

(II) technical scheme

In order to achieve the above object, the utility model discloses a main technical scheme include:

CO with pressure maintaining machine₂A barrel pump assembly, comprising: maintenance unit, CO₂Circulation bucket, switch board, automatic oil return module, circulation pump package and public base, CO₂The circulating barrel, the control cabinet, the automatic oil return module and the circulating pump set are respectively connected to the common base, and the maintaining unit, the automatic oil return module and the circulating pump set are respectively connected with the control cabinet; the maintenance unit and CO₂The circulating barrels are connected;

the automatic oil return module is connected with CO in one way₂The circulating barrel is connected, and the other path of the automatic oil return module is connected with CO through the main liquid supply module₂The circulating barrels are connected; the main liquid supply module is connected with the control cabinet; the CO is₂The circulating barrel is connected with an evaporator through a circulating pump group.

Further, the CO is₂And a liquid level control module is arranged on the circulating barrel.

Further, the CO is₂The circulating barrel is connected with a drying and filtering module.

(III) advantageous effects

The utility model has the advantages that: 1. the unit design pressure reaches 5.0MPa, and the method can be applied to CO with high pressure requirement₂In the refrigerating system, the high-pressure impact on the unit caused by the defrosting condition of the system can be borne. 2. The unit is designed with an oil return heater for heating the mixture of oil and refrigerant, so that the oil is separated from the refrigerant, and the oil return efficiency is improved. 3. The unit is designed in a block-prizing manner, the whole set of unit is placed on the public base, and the design is compactThe vibration is small; the machine is of a prying design, and is convenient to transport and install. The standardized design is adopted, the assembly line type assembly is facilitated, the manufacturing quality of the unit can be effectively guaranteed, and the later maintenance is facilitated.

Drawings

Fig. 1 is a schematic view of the overall structure of an embodiment of the present invention.

[ description of reference ]

1: maintaining the unit;

2：CO₂a circulating barrel;

3: a main liquid supply module;

4: a liquid level control module;

5: a control cabinet;

6: an automatic oil return module;

7: a circulating pump group;

8: a common base;

9: and (4) drying and filtering the module.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

The utility model discloses a take CO of pressure maintenance machine of embodiment₂A barrel pump assembly, as shown in fig. 1, comprising: maintenance unit 1, CO₂Circulating barrel 2, control cabinet 5, automatic oil return module 6, circulating pump group 7 and public base 8, CO₂The circulating barrel 2, the control cabinet 5, the automatic oil return module 6 and the circulating pump unit 7 are respectively connected to a common base 8, and the maintaining unit 1, the automatic oil return module 6 and the circulating pump unit 7 are respectively connected with the control cabinet 5; the maintaining unit 1 is arranged in CO₂Circulating the barrel 2 and maintaining the unit 1 and CO₂The circulating barrels 2 are communicated, and when power failure occurs accidentally, system failure occurs or no cold energy is needed in a short time, the small-sized maintaining unit 1 is used for automatically maintaining CO₂CO in the circulating barrel 2₂Pressure, ensuring CO with low power consumption₂CO in the circulating barrel 2₂Automatic CO release under overpressure without pressure exceeding design pressure₂A refrigerant.

Specifically, the automatic oil return module 6 is connected with the CO in one way₂The circulating barrel 2 is connected, and the other path of the automatic oil return module 6 is connected with CO through the main liquid supply module 3₂The circulating barrel 2 is connected; the main liquid supply module 3 is connected with a control cabinet 5.

In particular, the CO₂A liquid level control module 4 is arranged on the circulating barrel 2, and the liquid level control module 4 is connected with a control cabinet 5 and used for monitoring CO in real time₂The liquid level of the circulating barrel 2 is transmitted to the control cabinet 5 in real time to control the opening degree of the regulating valve of the main liquid supply module 3.

In particular, the CO₂The circulating barrel 2 is connected with an evaporator through a circulating pump group 7, and the circulating pump group 7 is formed by connecting a plurality of circulating pumps in series.

Further, the CO is₂The circulating barrel 2 is connected with a drying and filtering module 9, and CO is₂Drying moisture and filtering solid impurities for the refrigerant during refrigerant charge; at the same time in CO₂The CO in the refrigeration ring system is periodically dried and filtered during the operation of the circulating barrel 2₂A refrigerant; the unit supports the replacement of the drying filter element without stopping the machine.

Further, the automatic oil return module 6 is composed of a tubular heat exchanger YHRQ1.48A, an oil taking tube group, an oil return tube group and an air return tube group, and an inlet at the tube side of the tubular heat exchanger YHRQ1.48A and the CO are connected with each other₂The liquid outlet pipe of the high-pressure storage tank is connected, the outlet of the pipe side of the pipe heat exchanger YHRQ1.48A is connected with the main liquid supply module 3, the oil taking pipe group is respectively connected with the shell side of the pipe heat exchanger YHRQ1.48A and the outlet header pipe of the circulating pump group 7, the oil return pipe group is respectively connected with the shell side of the pipe heat exchanger YHRQ1.48A and the air suction header pipe of the compressor, and the air return pipe group is respectively connected with the shell side of the pipe heat exchanger YHRQ1.48A and the CO₂A circulating barrel 2; compressor refrigeration oil and CO selected during design₂The refrigerant is mutually soluble, the oil-taking pipe group takes the mixture of the refrigerant in a low-temperature state and the refrigeration oil from the pump outlet pipe of the circulating pump group 7, enters the shell side of the shell-and-tube heat exchanger YHRQ1.48A and is treated by CO₂The high-pressure storage tank enters the high-temperature refrigerant on the tube side of the tube still YHRQ1.48A to heat, so that the low-temperature refrigerant on the shell side is gasified and returns to CO through the gas return tube group₂The freezing oil is not gasified and left in the circulating barrel 2At the bottom of shell side of calandria YHRQ1.48A, solenoid valves on the oil return tube bank are opened periodically to allow the refrigerant oil remaining at the bottom of shell side of calandria YHRQ1.48A to return to the compressor.

The maintenance unit 1 is a complete small R507A piston compression condensing unit, and the start and stop of the unit are set at CO₂Pressure sensor control on the circulation tank 2. The main task of the maintaining unit is to maintain CO₂CO in barrel pump unit₂The media temperature is maintained at the relief valve take-off pressure. When CO is present₂When the barrel pump unit does not need to carry out refrigeration and liquid supply, the system is in a dormant state, and CO is₂Compressor and CO₂The medium condensing compressor is switched off. The CO2 medium in the system is continuously heat-exchanged with the environment, and over time, CO₂The temperature and the pressure can be continuously increased, when the pressure reaches an upper limit set value, the maintaining unit can be automatically started to control the CO₂CO in the recycle bin 2₂And (5) cooling the medium. When the pressure reaches the lower limit set value, the maintaining unit can be automatically closed.

The main liquid supply module 3 is an expansion valve assembly, which maintains the pressure difference between the front valve and the rear valve of the valve, for CO₂The circulating barrel 2 is used for fluid infusion; the liquid level control module 4 is a liquid level sensor, a control module and a liquid level switch, and ensures CO₂The liquid level in the circulating barrel 2 is at a designed value, so that the normal operation of the system is prevented from being influenced by too high or too low liquid level. The drying and filtering module (9) is composed of a drying filter, a filter element and a pipeline.

When the refrigeration system is implemented, high-temperature and high-pressure refrigerant liquid generated by the compressor is heated by the automatic oil return module 6, the automatic oil return module 6 heats a mixture of low-temperature return oil and the refrigerant (high-temperature and high-pressure refrigerant liquid), so that the refrigeration oil is separated from the refrigerant, and the separated refrigerant goes to CO₂The circulating barrel 2, and the refrigeration oil goes to the suction pipeline of the compressor and returns to the compressor together with the refrigerant gas; meanwhile, the high-temperature high-pressure refrigerant liquid can enter the automatic oil return module 6, the refrigeration oil in the automatic oil return module 6 and the high-temperature high-pressure refrigerant liquid are supercooled and then enter the main liquid supply module 3 for throttling, and low-temperature low-pressure refrigerant liquid is formed and enters CO₂A circulating barrel 2; liquid level control module 4 monitors CO in real time₂Circulating the liquid level of the barrel 2 and obtaining the liquid level dataReal-time transmitting to the control cabinet 5 to control the opening of the regulating valve of the main liquid supply module 3 and ensure CO₂The liquid level of the circulating barrel 2 is kept at a reasonable value; the circulating pump unit 7 sends the low-temperature and low-pressure refrigerant liquid into the evaporator at the tail end of the refrigeration house, and the refrigerant liquid flows back to CO after being evaporated by the evaporator₂The circulation barrel 2 performs vapor-liquid separation (CO)₂The circulating barrel 2 has a gas-liquid separation function), and the separated vapor refrigerant is composed of CO₂The upper end of the circulating barrel 2 returns to the air suction end of the compressor unit to be compressed and condensed and then enters the main liquid supply module 3, and the process is circulated.

The unit design pressure reaches 5.0MPa, and the method can be applied to CO with high pressure requirement₂In the refrigerating system, the high-pressure impact on the unit caused by the defrosting condition of the system can be borne.

The unit is designed with an oil return heater for heating the mixture of oil and refrigerant, so that the oil is separated from the refrigerant, and the oil return efficiency is improved.

The unit is designed in a manner of block prying, the whole set of unit is placed on the public base, the design is compact, and the vibration is small. The machine is of a prying design, and is convenient to transport and install. The standardized design is adopted, the assembly line type assembly is facilitated, the manufacturing quality of the unit can be effectively guaranteed, and the later maintenance is facilitated.

The unit is convenient to operate, automatic preventive safety protection measures are designed, and unattended operation and remote centralized control can be achieved.

Claims (3)

1. CO with pressure maintaining machine₂Barrel pump unit, its characterized in that, it includes: maintenance unit (1), CO₂Circulating barrel (2), control cabinet (5), automatic oil return module (6), circulating pump group (7) and public base (8), CO₂The circulating barrel (2), the control cabinet (5), the automatic oil return module (6) and the circulating pump set (7) are respectively connected to a common base (8), and the maintaining unit (1), the automatic oil return module (6) and the circulating pump set (7) are respectively connected with the control cabinet (5); the maintenance unit (1) and CO₂The circulating barrels (2) are connected;

the automatic oil return module (6) is connected with CO all the way₂The circulating barrel (2) is connected, and the other path of the automatic oil return module (6) is connected with CO through the main liquid supply module (3)₂Circulating barrel (2) phaseConnecting; the main liquid supply module (3) is connected with the control cabinet (5); the CO is₂The circulating barrel (2) is connected with an evaporator through a circulating pump group (7).

2. CO with pressure maintenance machine according to claim 1₂Barrel pump unit, its characterized in that: the CO is₂The circulating barrel (2) is provided with a liquid level control module (4).

3. CO with pressure maintenance machine according to claim 1₂Barrel pump unit, its characterized in that: the CO is₂The circulating barrel (2) is connected with a drying and filtering module (9).

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