CN216845190U - Parallel compressor system and air conditioner - Google Patents

Abstract

The utility model provides a parallelly connected compressor system and air conditioner, parallelly connected compressor system includes two at least compressors, each compressor parallel connection, each the compressor includes injection structure and oil equalizing pipe, the injection structure with oil equalizing pipe arranges respectively in the primary importance and the second place of the lateral wall of the casing of compressor, the injection structure sprays partial refrigerant into the pump body of compressor, oil equalizing pipe will unnecessary freezing oil mass discharge compressor in the compressor is outer. The utility model discloses simple structure, the compressor can realize the free parallel combination of big number, and improves the heating capacity and the security requirement of compressor when low temperature.

Description

Parallel compressor system and air conditioner

Technical Field

The utility model relates to a compressor technical field, concretely relates to parallelly connected compressor system and air conditioner.

Background

Along with the pursuit of people for high-quality life, the favor degree of consumers for central air conditioners is increased, the resource, research and development investment, terminal popularization and the like of household appliance enterprises on multi-split air conditioners promote the rapid development of the domestic multi-split air conditioner market, and the multi-split air conditioner market is accelerated and developed at a good potential in recent years. Commercial air conditioning system companies all develop large-scale systems by parallel connection of compressors or parallel connection of modules to meet market demands. The parallel system has the advantage that compressors or modules can be freely connected in parallel according to the requirements of end customers. Compared with high-power screw compressors and scroll compressors, the advantages of the parallel rotor compressors include: the combination can be carried out freely and conveniently, and the capability coverage range is wider; multi-stage control can be provided, so that the output of the unit is more matched with the actual load of the compressor; the maintenance is convenient and flexible, the system can be designed in a standardized way, and the development, manufacturing, maintenance and management costs are reduced; the compressors work partially or alternately according to the actual load, and the parallel system is realized by the parallel oil return pipe of the compressor design.

With the market popularization of the multi-split air conditioner, the system is planned to be used in low-temperature occasions, freezing and refrigerating or northern cold areas, and when the system is used in the field, the capacity is insufficient, and the consumer feels uncomfortable. When the extreme heats the operating mode, there is the pressure ratio great, and exhaust temperature is higher, compressor heat dissipation scheduling problem badly.

SUMMERY OF THE UTILITY MODEL

To the problem among the prior art, the utility model aims to provide a parallelly connected compressor system and air conditioner, the compressor can realize the freely parallel combination of big number, improves the heating capacity of compressor under the low temperature occasion, improves the security of compressor.

An embodiment of the utility model provides a compressor system connects in parallel, including two at least compressors, each compressor parallel connection, each the compressor includes injection structure and oil equalizing pipe, injection structure with oil equalizing pipe arranges in respectively the primary importance and the second place of the lateral wall of the casing of compressor, injection structure injects partial refrigerant the pump body of compressor, oil equalizing pipe will outside unnecessary freezing oil mass discharge compressor in the compressor.

In some embodiments, the spray structure includes a spray reservoir including a spray tube, a second end of the spray tube being in communication with the pump body.

In some embodiments, the pump body of the compressor includes a first cylinder, a second cylinder, and an intermediate plate, the first cylinder being separated from the second cylinder by the intermediate plate.

In some embodiments, the intermediate plate is provided with injection holes communicating with the first cylinder and the second cylinder.

In some embodiments, the oil equalizing pipe includes an inlet disposed at the second position of the sidewall and an outlet disposed at the discharge pipe of the compressor and in communication with the discharge pipe.

In some embodiments, the refrigeration system further comprises an oil return structure for distributing the excess refrigeration oil discharged by the compressor from the inlet of the oil equalizing pipe to the compressor with the low refrigeration oil quantity.

In some embodiments, the excess refrigeration oil in the compressor is discharged out of the compressor from the exhaust pipe through the inlet of the oil-equalizing pipe to the outlet of the oil-equalizing pipe, and enters an oil return structure.

An embodiment of the utility model provides an air conditioner, include as above parallelly connected compressor system.

In some embodiments, the system further comprises a condenser, an economizer, an evaporator, and a refrigerant, wherein a first portion of the refrigerant flowing from the condenser passes through the economizer and enters the evaporator through a first line; a second portion of the refrigerant passes through the injection structure into a pump body of the compressor.

In some embodiments, the second portion of the refrigerant flashes into a gaseous state before entering the pump body of the compressor.

The utility model provides a parallelly connected compressor system and air conditioner has following advantage:

the utility model provides a parallelly connected compressor system can realize the independent assortment of big number under the low temperature occasion, and the security requirement of the big heat and compressor when satisfying low temperature heating.

Drawings

Other features, objects and advantages of the invention will become more apparent from a reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a compressor of a parallel compressor system according to an embodiment of the present invention;

fig. 2 is a schematic view of a compressor injection structure pipeline and a refrigerant injection direction of a parallel compressor system according to an embodiment of the present invention;

fig. 3 is a schematic view of a pump body structure of a compressor of a parallel compressor system according to an embodiment of the present invention and a direction of refrigerant flowing into the pump body;

fig. 4 is a schematic structural view of an external form of a compressor of a parallel compressor system according to an embodiment of the present invention;

fig. 5 is a pressure-enthalpy diagram of an air conditioner according to an embodiment of the present invention.

Reference numerals:

1 compressor 13 Pump body

11 injection structure 131 first cylinder

111 injection pipe 132 second cylinder

12 oil equalizing pipe 133 middle plate

Inlet 14 exhaust pipe of 121 oil equalizing pipe

Outlet of 122 oil equalizing pipe

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus, a repetitive description thereof will be omitted. In the specification, "or" may mean "and" or ".

An embodiment of the utility model provides a compressor system connects in parallel, including two at least compressors, each compressor parallel connection. Fig. 1 and 4 are compressors of a parallel compressor system according to an embodiment of the present invention, and as shown in the drawings, each of the compressors 1 includes an injection structure 11 and an oil equalizing pipe 12. The injection structure 11 and the oil equalizing pipe 12 are respectively arranged at a first position and a second position on the side wall of the shell of the compressor 1, and the injection structure 11 is used for injecting part of refrigerant into the pump body of the compressor 1, so that the refrigerant in the pump body is supplemented, the temperature of the pump body is reduced, and the heating capacity is improved. The oil equalizing pipe 12 is used for discharging the excessive amount of the freezing oil in the compressor 1 to the outside of the compressor 1, and the system redistributes the discharged excessive amount of the oil to at least the oil in the compressor. Specifically, the oil equalizing pipe 12 includes an inlet 121 and an outlet 122, the inlet 121 is disposed at the second position of the sidewall, and the outlet 122 is disposed at the exhaust pipe of the compressor 1 and is communicated with the exhaust pipe. The inlet 121 of the oil equalizing pipe is arranged at the target oil level of the compressor 1, and when the frozen oil level of the compressor 1 is higher than the target oil level, the redundant frozen oil is discharged out of the compressor 1 from the exhaust pipe 14 of the compressor 1 along the oil equalizing pipe 12. The design of the oil equalizing pipe for discharging the redundant oil of the compressor to the outside of the compressor is designed according to the Bernoulli principle. The bernoulli equation is as follows:

the object of the bernoulli equation is a high-pressure refrigerant in a compressor housing, and a pump body of the compressor discharges the compressed high-temperature and high-pressure refrigerant from the pump body on the lower side of the housing, and then the compressed high-temperature and high-pressure refrigerant passes through the housing upwards and is discharged out of the compressor through an exhaust pipe. Z1, V1, P1, rho 1 and g1 in the Bernoulli equation respectively represent the position height, the flow speed, the pressure, the density and the gravitational acceleration of the high-pressure gaseous refrigerant in the shell; z2, V2, P2, rho 2 and g2 respectively replace the position height, the flow speed, the pressure, the density and the gravity acceleration of the high-pressure gaseous refrigerant at the exhaust pipe, wherein g1 and g2 are equal, and rho 1 is slightly larger than rho 2. Because the inner diameter of the shell is far larger than the inner diameter of the exhaust pipe, the flow velocity V1 of the refrigerant in the exhaust pipe is higher than that of the refrigerant in the shell, and compared with the difference between V1 and V2, the difference between rho 1 and rho 2 can be ignored, so that the pressure P2 of the exhaust pipe with the high flow velocity of the refrigerant is lower than the pressure P1 in the shell with the low flow velocity of the refrigerant according to the Bernoulli equation, and when the oil level of the refrigerating machine oil is higher than the inlet of the oil equalizing pipe, the redundant refrigerating oil above the inlet of the oil equalizing pipe can return to the parallel system through the oil equalizing pipe to be redistributed again by utilizing the pressure difference. The oil equalizing pipe establishes pressure difference by means of the structure of the compressor, discharges redundant refrigerating machine oil in the compressor to the system, and sends redundant oil back to the compressor with less oil through the flow and oil return design of a refrigerant in the system, so that the oil level of all the compressors is ensured to meet the requirement, and the damage of the compressors in parallel connection, which is caused by oil shortage, is reduced.

Further, fig. 2 is the embodiment of the present invention provides a schematic diagram of the injection structure of the compressor for injecting the refrigerant in the direction, fig. 3 is the present invention provides a schematic diagram of the pump body structure of the compressor and the refrigerant flowing into the pump body of the compressor through the injection structure. As can be taken from fig. 2 and 3, the injection structure 11 comprises an injection reservoir comprising an injection pipe 111, a second end of the injection pipe 111 being in communication with the pump body 14; the compressor 1 is a double-cylinder compressor, the pump body 13 of the compressor 1 comprises a first cylinder 131, a second cylinder 132 and an intermediate plate 133, and the first cylinder 131 and the second cylinder 132 are separated by the intermediate plate 133; the intermediate plate 133 is provided with injection holes communicating with the first and second cylinders 131 and 132. Specifically, the refrigerant entering the injection structure 11 is conveyed to the middle plate 133 of the pump body 13 along the injection pipe 111, the injection structure 11 is communicated with the middle plate 133, and when the refrigerant is conveyed to the injection hole, the refrigerant enters the first cylinder 131 and the second cylinder 133 from two directions respectively, so that the supplement of the refrigerant in the pump body of the compressor is realized, the injection structure can realize air supplement and enthalpy increase, the temperature of the pump body of the compressor is reduced, and the heating capacity of the compressor is improved.

The multiple compressors are connected in parallel to the same system, so that the cold power range of the compressors can be expanded, the grading control of the parallel units is realized, and the energy efficiency ratio of the system is improved. Because the system load changes and the running states of all the compressors in the parallel system are different, the compressors can be completely or partially started according to actual requirements, and therefore the distribution scheme of the refrigeration oil and the refrigerant in the parallel system is complex. In order to prevent the compressor from being damaged due to oil shortage, a parallel oil return structure is designed. Therefore, the parallel compressor system further comprises an oil return structure (not shown in the figure) for distributing the redundant refrigeration oil discharged by the compressor with a large oil quantity to the compressor with a small refrigeration oil quantity from the inlet of the oil equalizing pipe, so as to improve the safety of the compressor. Specifically, as shown in fig. 1, the redundant refrigeration oil in the compressor 1 is discharged out of the compressor 1 from the exhaust pipe 14 to the outlet 122 of the oil equalizing pipe 12 through the inlet of the oil equalizing pipe 12, and enters the oil return structure, and the oil return structure first collects the discharged redundant oil amount and then distributes the oil amount to other oil-deficient compressors, so as to avoid damage caused by oil shortage of the compressors. By arranging the oil return structure and the air-supplying enthalpy-increasing structure on the parallel compressors, the compressors can realize the free combination of 10-120hp (horsepower) on low-temperature occasions, and simultaneously, the requirements of large heat and the safety of the compressors during low-temperature heating are met.

The embodiment of the utility model provides an air conditioner is still provided, include as above parallelly connected compressor system, consequently have all technological effects of above-mentioned parallelly connected compressor, no longer describe here. The air conditioner also comprises a condenser, an economizer, an evaporator and a refrigerant, wherein when the air conditioner operates normally, the liquid refrigerant flowing out of the condenser (an indoor unit) is divided into two paths, the first path is a main path, the second path is an auxiliary path, and the second path is an air supplementing loop. After the refrigerant flows out of the condenser, a first part of the refrigerant enters the economizer through a first pipeline and then directly enters the evaporator (outdoor unit) through throttling; the second part of the refrigerant exchanges heat after throttling, the refrigerant flashes into a gaseous state, enters the pump body of the compressor through the injection structure and is mixed with the refrigerant in the original pump body, the mass flow of the refrigerant in the compressor is increased, the heating capacity is improved, and the temperature of the pump body is reduced. Fig. 5 is a pressure-enthalpy diagram of the air conditioner, as shown in the figure, the abscissa is an enthalpy value, the ordinate is a pressure, the total amount of the refrigerant entering the condenser is m + i, when the refrigerant absorbs heat through the condenser, the refrigerant is divided into two paths, the first path of refrigerant amount is m, the refrigerant enters the evaporator and then enters the compressor to perform a refrigeration cycle, and the other path of refrigerant with the total amount of i directly enters the compressor again to perform a refrigeration cycle from the injection structure without passing through the evaporator, so that a large heating amount of the air conditioner at a low temperature is realized.

The utility model provides a parallelly connected compressor system and air conditioner has following advantage:

the utility model provides a parallelly connected compressor can realize the free parallel combination that big match number required when low temperature, improves the heating capacity and the safety in utilization of compressor when low temperature.

The foregoing is a more detailed description of the present invention, taken in conjunction with specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments thereof. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (10)

1. A parallel compressor system, comprising:

the compressor comprises at least two compressors, each compressor is connected in parallel and comprises an injection structure and an oil equalizing pipe, the injection structure and the oil equalizing pipe are respectively arranged at a first position and a second position of the side wall of a shell of the compressor, the injection structure injects part of refrigerant into a pump body of the compressor, and the oil equalizing pipe discharges the redundant frozen oil in the compressor out of the compressor.

2. The parallel compressor system of claim 1, wherein the injection structure comprises an injection accumulator comprising an injection tube, a second end of the injection tube being in communication with the pump body.

3. The parallel compressor system of claim 2, wherein the pump body of the compressor comprises a first cylinder, a second cylinder, and an intermediate plate, the first cylinder being separated from the second cylinder by the intermediate plate.

4. The parallel compressor system of claim 3, wherein the intermediate plate is provided with injection holes communicating with the first cylinder and the second cylinder.

5. The parallel compressor system of claim 1, wherein the oil equalization pipe comprises an inlet and an outlet, the inlet is disposed at the second location of the sidewall, and the outlet is disposed at the discharge pipe of the compressor and is in communication with the discharge pipe.

6. The parallel compressor system of claim 5, further comprising an oil return structure for distributing excess refrigeration oil discharged from the compressor from the inlet of the oil equalization pipe to the compressor with a reduced amount of refrigeration oil.

7. The parallel compressor system of claim 6, wherein excess refrigeration oil in the compressor passes from an inlet of the oil equalization pipe to an outlet of the oil equalization pipe, exits the compressor from the discharge pipe, and enters an oil return structure.

8. An air conditioner characterized by comprising the parallel compressor system of any one of claims 1 to 7.

9. The air conditioner of claim 8, further comprising a condenser, an economizer, an evaporator and a refrigerant, wherein a first portion of said refrigerant exiting said condenser passes through said economizer and enters said evaporator via a first line; a second portion of the refrigerant passes through the injection structure into a pump body of the compressor.

10. The air conditioner of claim 9, wherein the second portion of the refrigerant flashes into a gaseous state before entering the pump body of the compressor.

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