CN218565825U - External oil return structure and refrigeration equipment - Google Patents
External oil return structure and refrigeration equipment Download PDFInfo
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- CN218565825U CN218565825U CN202222728910.4U CN202222728910U CN218565825U CN 218565825 U CN218565825 U CN 218565825U CN 202222728910 U CN202222728910 U CN 202222728910U CN 218565825 U CN218565825 U CN 218565825U
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- storage tank
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Abstract
The utility model discloses an external oil return structure and refrigeration plant, external oil return structure includes: the oil storage tank with advance oil pipe and time oil pipe, a level sensor for detecting the inside actual liquid level of oil storage tank, it links to each other with the oil return opening of compressor to return oil pipe, the top of oil storage tank is equipped with the blast pipe, the blast pipe links to each other with the induction port of compressor, the governing valve of adjusting the displacement is installed to the blast pipe, level sensor and governing valve all connect in control module, control module controls the governing valve according to level sensor's detection signal. The utility model discloses can be in the air storage tank gas when too much arrange the induction port of compressor through the blast pipe, avoid appearing the gas blocking phenomenon, lubricating oil can get into the oil storage tank smoothly, gets into the compressor bearing through pressure differential and lubricates, ensures the compressor reliable operation.
Description
Technical Field
The utility model relates to a compressor oil return technical field especially relates to external oil return structure and refrigeration plant.
Background
The bearings of the compressor are mainly lubricated by lubricating oil, and whether the oil lubrication can be stably provided is one of the key control points for determining the reliability of the compressor. As shown in fig. 1, the conventional external oil circulation system comprises an oil separator, an oil storage tank, a valve, a connecting pipeline and the like, when the separation efficiency of the oil separator is abnormal, the liquid level at the oil taking port is too low to cause the formation of an effective liquid seal, gas can flow into the oil storage tank 3 from the oil inlet pipe 2 through the oil taking port and form an air blocking phenomenon, so that lubricating oil can not smoothly enter the oil storage tank 3, the oil return pipe 7 can not normally return oil to the compressor, the oil lubrication amount of the compressor is reduced therewith, the lubrication of a bearing is insufficient, and the normal use of the compressor is influenced.
The existing adopted solving measures are to improve the efficiency of the oil separator, increase the oil filling amount and ensure that an oil taking port can form effective liquid seal, but the problem caused by the method is that the volume of the built-in oil separator of the condenser is overlarge, so that the integral structure of the unit is large, the oil content of a refrigerating system is increased, and the heat exchange of the system is influenced and the cost of the unit is increased.
Therefore, how to design an external oil return structure capable of effectively avoiding air blockage is a technical problem to be solved urgently in the industry.
SUMMERY OF THE UTILITY MODEL
Effective scheme to prior art does not solve the stifled phenomenon of gas, the utility model provides an external oil return structure and refrigeration plant, this external oil return structure can be in the oil storage tank gaseous induction port of discharging the compressor through the blast pipe when too much, avoids appearing the stifled phenomenon of gas, and lubricating oil can get into the oil storage tank smoothly, gets into the compressor bearing through pressure differential and lubricates, ensures the compressor reliable operation.
The utility model discloses a technical scheme be, design external oil return structure, include: the oil storage tank is provided with an oil inlet pipe and an oil return pipe, the oil return pipe is connected with an oil return port of the compressor, an exhaust pipe is arranged at the top of the oil storage tank and connected with an air suction port of the compressor, and an adjusting valve for adjusting the air displacement is installed on the exhaust pipe.
Further, external oil return structure still includes: and the liquid level sensor is used for detecting the actual liquid level in the oil storage tank.
Further, external oil return structure still includes: and the control module, the liquid level sensor and the regulating valve are connected to the control module, and the control module controls the regulating valve according to the detection signal of the liquid level sensor.
Further, when the actual liquid level is higher than the set safe liquid level, the control module controls the regulating valve to be closed; and/or when the actual liquid level is between the set safety liquid level and the set critical liquid level, the control module adjusts the opening of the regulating valve according to the change of the actual liquid level; and/or when the actual liquid level is at the set critical liquid level, the control module controls the regulating valve to be fully opened.
Further, the exhaust pipe is provided with at least one manual valve connected in series with the regulating valve.
Furthermore, the diameter of the oil inlet pipe is larger than that of the oil return pipe.
Furthermore, the diameter of the oil return pipe is the same as that of the exhaust pipe.
In some embodiments, the oil inlet pipe is connected to an internal oil separator outlet of the condenser.
The utility model also provides a refrigeration plant, this refrigeration plant adopts foretell external oil return structure.
In some embodiments, the refrigeration appliance is a screw chiller.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the oil storage tank is provided with an exhaust pipe, and when the gas in the oil storage tank is excessive, the gas is exhausted to a gas suction port of the compressor through the exhaust pipe, so that the gas blockage phenomenon is avoided;
2. the liquid level sensor and the regulating valve are connected to the control module, and the gas proportion in the oil storage tank can be automatically regulated according to the liquid level, so that the reliable operation of the compressor is ensured;
3. because the surplus gas in the oil storage tank can be discharged through the regulating valve in time, the oil-gas two-phase mixture is allowed to enter the oil storage tank from the air inlet pipe, the oil filling amount of the system can be properly reduced, the oil content of the refrigerating system is reduced, and the efficient heat exchange of the refrigerating system is ensured.
Drawings
The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings, in which:
FIG. 1 is a schematic of a prior art oil return configuration;
fig. 2 is the oil return structure schematic diagram of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the patent and do not limit the patent.
As shown in fig. 2, the utility model provides an external oil return structure is applicable to among the refrigeration plant, refrigeration plant includes but not limited to screw cooling water set, external oil return structure's essential element is oil storage tank 3 respectively and connects the different pipelines on oil storage tank 3, one side top of oil storage tank 3 is equipped with into oil pipe 2, the opposite side top is equipped with blast pipe 4, oil storage tank 3's lower part or bottom are equipped with back oil pipe 7, it sends into oil storage tank 3 with the double-phase mixture of oil gas to advance oil pipe 2, lubricating oil sinks in oil storage tank 3's lower part, gas hangs the upper portion at oil storage tank 3, the position design of returning oil pipe 7 and blast pipe 4 can do benefit to oil storage tank 3's lubricating oil and gas outflow. An oil return pipe 7 of the oil storage tank 3 is connected with an oil return opening of the compressor, an exhaust pipe 4 is connected with an air suction opening of the compressor, a regulating valve 6 for regulating the exhaust amount is installed on the exhaust pipe 4, and when the gas in the oil storage tank 3 is excessive, the gas is sent back to the air suction opening of the compressor through the exhaust pipe 4.
It should be noted that, because the external oil return structure is usually disposed in a refrigeration system, the refrigeration system has a compressor, a condenser, a throttling device, an evaporator, and the like, a high-temperature gaseous refrigerant discharged from an exhaust port of the compressor enters the throttling device after being cooled by the condenser, and a low-temperature liquid refrigerant flowing out of the throttling device returns to an air suction port of the compressor after being heated by the evaporator. In some embodiments, the condenser has an internal oil separator or the exhaust port of the compressor is provided with an external oil separator, the oil inlet pipe 2 can be connected with the outlet of the internal oil separator of the condenser or the outlet of the external oil separator of the exhaust port of the compressor, and the oil-gas two-phase mixture sent into the oil inlet pipe 2 is mainly a mixture of liquid lubricating oil and gaseous refrigerant, so that the gas refrigerant is sent back to the air suction port of the compressor, and the running performance of the compressor can be improved while the phenomenon of air blockage is avoided.
The utility model discloses an in some embodiments, in order to in time detect the inside liquid level condition of 3 oil storage tanks, external oil return structure still includes: the liquid level sensor 1 and the liquid level sensor 1 are used for detecting the actual liquid level inside the oil storage tank 3 so as to accurately adjust the opening degree of the regulating valve 6. On this basis, external oil return structure still is provided with control module, and level sensor 1 and governing valve 6 are all connected in control module, and governing valve 6 can adopt electronic expansion valve, and control module realizes the automated control of governing valve 6 according to level sensor 1's detection signal control governing valve 6, ensures the compressor reliable operation.
Specifically, when the actual liquid level La is above the set safe liquid level Lb, the oil return of the oil storage tank 3 at this stage is normal, no gas bypass is needed, and the control module controls the regulating valve 6 to close, that is, the opening of the regulating valve 6 is 0; when the actual liquid level La is between the set safe liquid level Lb and the set critical liquid level Lc, the control module adjusts the opening of the adjusting valve 6 according to the change of the actual liquid level La, namely the adjusting valve is adjusted in proportion between 0% and 100%, the lower the actual liquid level is, the larger the opening of the adjusting valve 6 is, otherwise, the higher the actual liquid level La is, the smaller the opening of the adjusting valve 6 is, and the opening of the adjusting valve 6 is increased along with the descending amplitude of the actual liquid level La; when the actual liquid level La is located at the set critical liquid level Lc, the oil return of the oil storage tank 3 is difficult at this stage, and the control module controls the adjusting valve 6 to be fully opened, namely the opening of the adjusting valve 6 is 100%. Wherein the set safety level Lb is higher than the set critical level Lc.
It should be understood that, control module judges the change of actual liquid level La according to the detected signal that level sensor 1 sent, and the liquid level rises or the decline in-process promptly, and level sensor 1 can send corresponding detected signal, and level sensor 1's type and quantity can design according to concrete needs, and during the practical application, for simplified control, can only select governing valve 6 to close and open two stages entirely, the utility model discloses do not do special restriction to this.
The utility model discloses an in some embodiments, the diameter of advancing oil pipe 2 is greater than back oil pipe 7 to in sending the oil storage tank 3 with the gas-liquid is double-phase, return the less diameter of oil pipe 7 design and can effectively prevent that the interior actual liquid level La of oil storage tank 3 from descending fast. The diameter of the oil return pipe 7 is the same as that of the exhaust pipe 4, when the unit is difficult to return oil, the regulating valve 6 is fully opened, the flow rates of the oil return pipe 7 and the exhaust pipe 4 are the same, and the air pressure balance in the oil storage tank 3 is maintained.
As shown in fig. 2, the exhaust pipe 4 is provided with at least one manual valve connected in series with the regulating valve 6, the manual valve is used for disconnecting the exhaust pipe 4 when the regulating valve 6 is in failure or maintenance, so as to facilitate maintenance of the unit, the manual valve is in an open state when the unit normally operates, and the manual valve can be a ball valve or other valve member with a switch function. In practical application, the exhaust pipe 4 is provided with two manual valves, namely a first manual valve 5 and a second manual valve 8, the regulating valve 6 is connected between the first manual valve 5 and the second manual valve 8 in series, and gas can be effectively blocked from passing through the regulating valve 6 by closing the first manual valve 5 and the second manual valve 8, so that the regulating valve 6 can be maintained or replaced conveniently.
The utility model discloses a design blast pipe 4 and governing valve 6 in time with the interior unnecessary gas outgoing of oil storage tank 3, allow the double-phase mixture of oil gas to get into oil storage tank 3 from advancing oil pipe 2, consequently can suitably reduce the oily perfusion volume of system, reduce refrigerating system oil content, ensure the high-efficient heat transfer of refrigerating system on the basis of avoiding appearing the stifled phenomenon of gas.
The utility model also provides a refrigeration plant, this refrigeration plant adopts foretell external oil return structure.
In some embodiments, the refrigeration equipment is a screw chiller, and the circulation principle of the screw chiller is that when the refrigeration oil separated from the built-in oil separator of the condenser enters the oil storage tank 3 through the oil inlet pipe 2, if the built-in oil separator has poor efficiency and cannot maintain liquid seal, the refrigeration oil enters the oil storage tank 3 as oil and gas phases. And 3 interior gases of oil storage tank when can't effectively discharge, will produce "gas block" phenomenon and influence the compressor oil return, and to screw compressor, the refrigeration oil plays cooling, sealed, lubricated effect in the cylinder, and is vital to the reliability of unit, so the utility model discloses an external oil return structure design has blast pipe 4 and governing valve 6, and control module adjusts governing valve 6's aperture according to level sensor 1's in the oil storage tank 3 detected signal, in time gets rid of harmful effects.
It is noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. The terms "first", "second", etc. are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the protection scope of the present invention is not to be construed as being limited. Unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. External oil return structure includes: the oil storage tank is characterized in that an exhaust pipe is arranged at the top of the oil storage tank and connected with an air suction port of the compressor, and an adjusting valve for adjusting the air displacement is mounted on the exhaust pipe.
2. The external oil return structure of claim 1, further comprising: and the liquid level sensor is used for detecting the actual liquid level inside the oil storage tank.
3. The external oil return structure of claim 2, further comprising: and the control module is connected with the liquid level sensor and the regulating valve and controls the regulating valve according to the detection signal of the liquid level sensor.
4. The external oil return structure of claim 3, wherein the control module controls the regulating valve to close when the actual liquid level is above a set safety liquid level;
and/or when the actual liquid level is between a set safety liquid level and a set critical liquid level, the control module adjusts the opening of the regulating valve according to the change of the actual liquid level;
and/or when the actual liquid level is at the set critical liquid level, the control module controls the regulating valve to be fully opened.
5. The external oil return structure of claim 1 wherein the exhaust pipe is fitted with at least one manual valve in series with the regulating valve.
6. The external oil return structure of claim 1 wherein the diameter of the oil inlet pipe is larger than the diameter of the oil return pipe.
7. The external oil return structure of claim 6 wherein the oil return pipe has the same diameter as the exhaust pipe.
8. The external oil return structure according to any one of claims 1 to 7, wherein the oil inlet pipe is connected to an internal oil separator outlet of the condenser.
9. Refrigeration equipment, characterized in that the refrigeration equipment adopts the external oil return structure of any one of claims 1 to 8.
10. The refrigeration appliance of claim 9 wherein the refrigeration appliance is a screw chiller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222728910.4U CN218565825U (en) | 2022-10-17 | 2022-10-17 | External oil return structure and refrigeration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222728910.4U CN218565825U (en) | 2022-10-17 | 2022-10-17 | External oil return structure and refrigeration equipment |
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| Publication Number | Publication Date |
|---|---|
| CN218565825U true CN218565825U (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222728910.4U Active CN218565825U (en) | 2022-10-17 | 2022-10-17 | External oil return structure and refrigeration equipment |
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|---|---|
| CN (1) | CN218565825U (en) |
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- 2022-10-17 CN CN202222728910.4U patent/CN218565825U/en active Active
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