CN219433521U - Multi-connected direct expansion air conditioning system with oil-free balance pipe - Google Patents
Multi-connected direct expansion air conditioning system with oil-free balance pipe Download PDFInfo
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- CN219433521U CN219433521U CN202320294258.1U CN202320294258U CN219433521U CN 219433521 U CN219433521 U CN 219433521U CN 202320294258 U CN202320294258 U CN 202320294258U CN 219433521 U CN219433521 U CN 219433521U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The utility model discloses a multi-connected direct expansion air conditioning system with oil-free balance pipes, which comprises a plurality of outdoor units, wherein the outdoor units are connected in parallel through a liquid side branch pipe and a gas side branch pipe to form the multi-connected air conditioning system, a throttling component is arranged in each outdoor unit, and the throttling component comprises an oil separator, a four-way valve, a heat exchanger, a gas-liquid separator, an electronic expansion valve and a one-way valve; according to the utility model, the oil separator is arranged in each external machine, 2-level oil return is arranged on the oil separator, meanwhile, the oil throwing pipe is arranged on the oil separator, when the oil level of the oil separator exceeds the position of the oil throwing pipe, lubricating oil in the oil separator is conveyed to a parallel system through the oil throwing pipe, the lubricating oil returns to the compressors through the air return pipe, so that the oil level of each compressor is ensured to be stable, and when a plurality of direct expansion external machines are connected in parallel through the oil balancing pipe, the oil separator is convenient for field use, and the cost and the construction difficulty are reduced.
Description
Technical Field
The utility model relates to the technical field of refrigeration air conditioners, in particular to a multi-connected direct expansion air conditioning system with oil-free balance pipes.
Background
When the conventional multi-connected air conditioner realizes that a plurality of outdoor units are connected in parallel, an oil balance pipe needs to be connected between the outdoor units so as to ensure that compressor oil is balanced between the compressors. As shown in fig. 1, 4 outdoor units (11, 12, 13, 14) are connected in parallel in a refrigeration system through air side branch pipes (31, 32, 33) and liquid side branch pipes (21, 22, 23), and in order to ensure the oil level of each outdoor unit, an oil balance pipe (4, 41, 42, 43, 44) needs to be added to each outdoor unit. The multiple external machines are connected in parallel, so that an oil balance pipe is added, and the complexity of site construction is increased.
Disclosure of Invention
The utility model provides a multi-connected direct expansion air conditioning system with oil-free balance pipes, which aims to solve the defects that a plurality of external machines are connected in parallel, an oil balance pipe is added, and the complexity of site construction is increased in the prior art.
In order to solve the technical problems, the utility model provides the following technical scheme:
the utility model relates to a multi-connected direct expansion air conditioning system with oil-free balance pipes, which comprises a plurality of outdoor units, wherein the outdoor units are connected in parallel through a liquid side branch pipe and a gas side branch pipe to form the multi-connected air conditioning system;
an air inlet of the oil separator is connected with a compressor in the outdoor unit through an exhaust pipe, and an oil throwing pipe and an exhaust port of the oil separator are connected with a D port of the four-way valve; the oil return port of the oil separator enters an air return pipe of the compressor through a first filter and a first oil return capillary tube to form a primary oil return pipeline; the air outlet end of the air-liquid separator is connected with the compressor, the air inlet end of the air-liquid separator is connected with the S end of the four-way valve, and one end of the heat exchanger is connected with the C end of the four-way valve; the E end of the four-way valve is connected with the air side branch pipe through the air side stop valve; the other end of the heat exchanger is connected with the liquid side branch pipe through a liquid side stop valve; the electronic expansion valve and the one-way valve are connected in parallel to form a valve path, and the valve path is connected in series on a pipeline between the heat exchanger and the liquid side stop valve.
As a preferable technical scheme of the utility model, a pressure balance loop is arranged between the air inlet end of the gas-liquid separator and the air outlet of the oil separator; the pressure balancing loop comprises a balancing pipe connected between the air inlet end of the gas-liquid separator and the air outlet of the oil separator, and the balancing pipe is provided with a third filter, a first electromagnetic valve and a capillary tube which are arranged in series.
As a preferable technical scheme of the utility model, the device further comprises a second electronic valve and a second oil return capillary tube which are arranged in series, wherein the second electronic valve and the second oil return capillary tube form a second-stage oil return pipeline, and the second-stage oil return pipeline and the first-stage oil return pipeline are arranged in parallel.
As a preferable technical scheme of the utility model, a second filter is connected in series between the air outlet end of the gas-liquid separator and the compressor.
As a preferable technical scheme of the utility model, a fourth filter is connected in series between the liquid side stop valve, the electronic expansion valve and the one-way valve in parallel to form a valve path.
As a preferable technical scheme of the utility model, the four-way valve and the air side stop valve are connected in series with a fifth filter.
The beneficial effects of the utility model are as follows:
this kind of many allies oneself with direct expansion air conditioning system of oilless balance pipe connects a plurality of off-premises stations in parallel to a refrigerating system through gas side and liquid side branch pipe, in order to solve the oil balance problem between every off-premises station, through setting up the oil separator in every off-premises station, set up 2 grades of oil returns on the oil separator, set up the oil throwing pipe simultaneously on the oil separator, when the oil level of oil separator exceeds the position of oil throwing pipe, the lubricating oil of the inside of oil separator is passed through the oil throwing pipe and is carried to parallelly connected system, get back to the compressor through the muffler, realize carrying out the redistribution to lubricating oil, guarantee that the oil level of every compressor is stable, when a plurality of direct expansion off-premises stations are parallelly connected through cancelling the oil balance pipe, the use on the spot is convenient, reduce cost and construction degree of difficulty.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
fig. 1 is a state diagram of a connector of an oil balance pipe in a conventional multi-connected air conditioner.
FIG. 2 is a schematic diagram of a multi-connected direct expansion air conditioning system with oil-free balance pipes according to the present utility model;
fig. 3 is a schematic structural diagram of a throttling assembly of a multi-connected direct expansion air conditioning system with oil-free balance pipes according to the present utility model.
In the figure: 1. an outdoor unit; 2. a liquid side manifold; 3. an air side manifold; 4. a throttle assembly; 401. an oil separator; 402. a four-way valve; 403. a heat exchanger; 404. a gas-liquid separator; 405. an electronic expansion valve; 406. a one-way valve; 407. a first filter; 408. a first oil return capillary; 409. a second filter; 410. an air side stop valve; 411. a liquid side stop valve; 412. a second electronic valve; 413. a second oil return capillary; 414. polishing an oil pipe; 5. a compressor; 6. a pressure balancing circuit; 601. a balance tube; 602. a third filter; 603. a first electromagnetic valve; 604. a capillary tube; 7. a fourth filter; 8. and a fifth filter.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Examples: as shown in fig. 2 and fig. 3, the multi-connected direct expansion air conditioning system with the oil-free balance pipe of the utility model comprises a plurality of outdoor units 1, wherein the outdoor units 1 are connected in parallel through a liquid side branch pipe 2 and a gas side branch pipe 3 to form the multi-connected air conditioning system, a throttling component 4 is arranged in the outdoor unit 1, and the throttling component comprises an oil separator 401, a four-way valve 402, a heat exchanger 403, a gas-liquid separator 404, an electronic expansion valve 405 and a one-way valve 406;
an air inlet of the oil separator 401 is connected with the compressor 5 in the outdoor unit 1 through an exhaust pipe, and an oil throwing pipe 414 and an exhaust port of the oil separator 401 are connected with a D port of the four-way valve 402; the oil return port of the oil separator 401 enters an air return pipe of the compressor 5 through a first filter 407 and a first oil return capillary 408 to form a primary oil return pipeline; an air outlet end of the air-liquid separator 404 is connected with the compressor 5, an air inlet end of the air-liquid separator 404 is connected with an S end of the four-way valve 402, and one end of the heat exchanger 403 is connected with a C end of the four-way valve 402; the E end of the four-way valve 402 is connected with the air side branch pipe 3 through the air side stop valve 410; the other end of the heat exchanger 403 is connected to the liquid-side branch pipe 2 via a liquid-side shutoff valve 411; the electronic expansion valve 405 and the check valve 406 are connected in parallel to form a valve path, and the valve path is connected in series to a pipeline between the heat exchanger 403 and the liquid side stop valve 411.
Wherein, a pressure balance loop 6 is arranged between the air inlet end of the gas-liquid separator 404 and the air outlet of the oil separator 401; the pressure balancing circuit 6 comprises a balancing pipe 601 connected between the air inlet end of the gas-liquid separator 404 and the air outlet of the oil separator 401, and the balancing pipe 601 is provided with a third filter 602, a first electromagnetic valve 603 and a capillary tube 604 which are arranged in series.
The device further comprises a second electronic valve 412 and a second oil return capillary 413 which are arranged in series, wherein the second electronic valve 412 and the second oil return capillary 413 form a second-stage oil return pipeline, and the second-stage oil return pipeline and the first-stage oil return pipeline are arranged in parallel.
Wherein, a second filter 409 is connected in series between the gas outlet end of the gas-liquid separator 404 and the compressor 5. The fourth filter 7 is connected in series between the liquid-side stop valve 411 and the valve path formed by connecting the electronic expansion valve 405 and the check valve 406 in parallel. The four-way valve 402 and the air side stop valve 410 are connected in series with the fifth filter 8.
The outdoor units 1 are connected in parallel to a refrigerating system through the air side branch pipes 2 and the liquid side branch pipes 2, in order to solve the problem of oil balance between each outdoor unit, the oil separator 401 is arranged in each outdoor unit, 2-level oil return is arranged on the oil separator 401, meanwhile, the oil throwing pipe 414 is arranged on the oil separator 401, when the oil level of the oil separator 401 exceeds the position of the oil throwing pipe, lubricating oil in the oil separator 401 is conveyed to a parallel system through the oil throwing pipe, and returns to the compressors 5 through the air return pipe, so that the re-distribution of the lubricating oil is realized, the stable oil level of each compressor 5 is ensured, and when the oil balance pipe 601 is canceled, the parallel connection of a plurality of direct expansion outdoor units is convenient for field use, and the cost and the construction difficulty are reduced.
The external machines are connected in parallel through the liquid side branch pipes and the air side branch pipes to form a refrigerating system, and are connected with the indoor machines through a group of pipes.
The exhaust gas of the compressor of the outdoor unit firstly enters the oil separator through the exhaust pipe; in the oil separator, lubricating oil stored at the bottom of the oil separator returns to the compressor through an oil return pipe and an air return pipe of the compressor through a first oil return capillary; the other path of the air return flow enters an air return pipe of the compressor to return to the compressor after passing through a second electronic valve and a second oil return capillary tube. The second electronic valve and the second oil return capillary tube return to the compressor from the connecting pipe and the air return pipe of the compressor; the other part of the refrigerant passes through the connecting pipe and then enters the D port of the four-way valve together with the gaseous refrigerant and lubricating oil which come out of the oil throwing pipe through the connecting pipe.
In the refrigeration working mode, the port D and the port C of the four-way valve are connected, enter the heat exchanger through the connecting pipe, pass through the connecting pipe, the one-way valve, the electronic expansion valve assembly and the third filter, and then are connected with the liquid side branch pipe through the liquid side stop valve, and enter the indoor unit together with the refrigerant and lubricating oil of other outdoor units; then through the evaporation of the indoor unit, the gaseous refrigerant enters the air side stop valve through the air side branch pipe, enters the E port of the four-way valve through the filter from the connecting pipe, enters the inlet of the air-liquid separator through the connecting pipe from the S port of the four-way valve, and returns to the compressor through the muffler of the compressor from the outlet of the air-liquid separator, thus completing a refrigeration cycle.
In a heating working mode, a D port and an E port of the four-way valve are connected, and the four-way valve is connected with an air side branch pipe through an air side stop valve after passing through a filter through a connecting pipe, and enters an indoor unit together with refrigerant and lubricating oil of other outdoor units; then through the condensation of the indoor unit, the liquid refrigerant enters the liquid side stop valve through the liquid side branch pipe, enters the heat exchanger from the connecting pipe for evaporation after being throttled by the electronic expansion valve through the third filter, enters the inlet of the gas-liquid separator from the S port of the four-way valve through the connecting pipe and returns to the compressor from the outlet of the gas-liquid separator through the muffler of the compressor through the C port of the four-way valve, and completes a refrigeration cycle.
In order to ensure the oil throwing effect, the connection position of the oil throwing pipe and the oil separator is positioned at the height position of 0.5-1.5L of the oil separator volume below the connection port.
Through the design of the oil separator and the oil throwing pipe, each outdoor unit does not store excessive lubricating oil, so that the dynamic balance of the lubricating oil among the outdoor units can be realized, and the final effect is that the oil balance pipe of the outdoor units connected in parallel is cancelled.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (6)
1. The multi-connected direct expansion air conditioning system with the oil-free balance pipes comprises a plurality of outdoor units (1), wherein the outdoor units (1) are connected in parallel through a liquid side branch pipe (2) and a gas side branch pipe (3) to form the multi-connected air conditioning system, and the multi-connected air conditioning system is characterized in that a throttling component (4) is arranged in the outdoor unit (1), and comprises an oil separator (401), a four-way valve (402), a heat exchanger (403), a gas-liquid separator (404), an electronic expansion valve (405) and a one-way valve (406);
an air inlet of the oil separator (401) is connected with a compressor (5) in the outdoor unit (1) through an exhaust pipe, and an oil throwing pipe (414) and an exhaust port of the oil separator (401) are connected with a D port of the four-way valve (402); an oil return port of the oil separator (401) enters an air return pipe of the compressor (5) through a first filter (407) and a first oil return capillary tube (408) to form a primary oil return pipeline; the air outlet end of the air-liquid separator (404) is connected with the compressor (5), the air inlet end of the air-liquid separator (404) is connected with the S end of the four-way valve (402), and one end of the heat exchanger (403) is connected with the C end of the four-way valve (402); the E end of the four-way valve (402) is connected with the air side branch pipe (3) through an air side stop valve (410); the other end of the heat exchanger (403) is connected with the liquid side branch pipe (2) through a liquid side stop valve (411); the electronic expansion valve (405) and the one-way valve (406) are connected in parallel to form a valve path, and the valve path is connected in series on a pipeline between the heat exchanger (403) and the liquid side stop valve (411).
2. The oil-free balance pipe multi-connected direct expansion air conditioning system according to claim 1, wherein a pressure balance loop (6) is arranged between the air inlet end of the gas-liquid separator (404) and the air outlet of the oil separator (401); the pressure balancing loop (6) comprises a balancing pipe (601) connected between the air inlet end of the gas-liquid separator (404) and the air outlet of the oil separator (401), and the balancing pipe (601) is provided with a third filter (602), a first electromagnetic valve (603) and a capillary tube (604) which are arranged in series.
3. The multi-connected direct expansion air conditioning system with the oil-free balance pipe according to claim 1, further comprising a second electronic valve (412) and a second oil return capillary (413) which are arranged in series, wherein the second electronic valve (412) and the second oil return capillary (413) form a second-stage oil return pipeline, and the second-stage oil return pipeline and the first-stage oil return pipeline are arranged in parallel.
4. The oil-free balance pipe multi-connected direct expansion air conditioning system according to claim 1, wherein a second filter (409) is connected in series between the air outlet end of the gas-liquid separator (404) and the compressor (5).
5. The oil-free balance pipe multi-connected direct expansion air conditioning system according to claim 1, wherein a fourth filter (7) is connected in series between the liquid side stop valve (411) and the valve path formed by connecting the electronic expansion valve (405) and the one-way valve (406) in parallel.
6. The oil-free balance pipe multi-connected direct expansion air conditioning system according to claim 1, wherein a fifth filter (8) is connected in series with the four-way valve (402) and the air-side stop valve (410).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320294258.1U CN219433521U (en) | 2023-02-23 | 2023-02-23 | Multi-connected direct expansion air conditioning system with oil-free balance pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320294258.1U CN219433521U (en) | 2023-02-23 | 2023-02-23 | Multi-connected direct expansion air conditioning system with oil-free balance pipe |
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| Publication Number | Publication Date |
|---|---|
| CN219433521U true CN219433521U (en) | 2023-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320294258.1U Active CN219433521U (en) | 2023-02-23 | 2023-02-23 | Multi-connected direct expansion air conditioning system with oil-free balance pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219433521U (en) |
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2023
- 2023-02-23 CN CN202320294258.1U patent/CN219433521U/en active Active
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