阅读说明：本技术 一种补油装置、螺杆式冷水机组系统以及回油方法 (Oil supplementing device, screw type water chilling unit system and oil return method ) 是由 龙忠铿 罗炽亮 卢志辉 吴宏择 于 2019-11-05 设计创作，主要内容包括：本发明提供一种适用于螺杆式冷水机组系统的补油装置、螺杆式冷水机组系统以及回油方法,涉及空调器技术领域,解决了现有技术中存在的压缩机因油位低而故障停机,人工调试回油后在一定时间内油位不能达到要求会导致机组再次停机从而影响工作效率的技术问题。补油装置包括备用油箱、压力调节组件和切换组件,所述备用油箱通过补油管路与压缩机储油腔相连,通过所述压力调节组件和所述切换组件能控制补油管路的通断,本结构能够在压缩机因油位低而故障停机时,通过压力调节组件和切换组件控制补油管路的通断为压缩机储油箱先行回油,使压缩机在经过人工调试回油后避免出现压缩机储油腔内不能及时回油而再次停机从而影响工作效率的现象。(The invention provides an oil supplementing device, a screw type water chilling unit system and an oil return method suitable for the screw type water chilling unit system, relates to the technical field of air conditioners, and solves the technical problems that in the prior art, a compressor is stopped due to a fault caused by low oil level, and the unit is stopped again due to the fact that the oil level cannot meet the requirement within a certain time after oil return is manually debugged, so that the working efficiency is affected. The oil supplementing device comprises a spare oil tank, a pressure regulating assembly and a switching assembly, wherein the spare oil tank is connected with an oil storage cavity of the compressor through an oil supplementing pipeline, the pressure regulating assembly and the switching assembly can control the on-off of the oil supplementing pipeline, and the structure can control the on-off of the oil supplementing pipeline through the pressure regulating assembly and the switching assembly to return oil for the oil storage tank of the compressor in advance when the compressor is in fault shutdown due to low oil level, so that the compressor is prevented from returning oil in time in the oil storage cavity of the compressor after manual debugging, and the compressor is stopped again to influence the working efficiency.)

1. The utility model provides a mend oily device suitable for screw cooling water unit system which characterized in that: including reserve tank, pressure regulating assembly and switching module, reserve tank links to each other with compressor oil storage chamber through the oil supply pipeline, through pressure regulating assembly with switching module can control the break-make of oil supply pipeline.

2. The oil replenishing device for a screw chiller system according to claim 1, wherein: the pressure regulating assembly comprises a regulating branch and a first valve body arranged in the regulating branch, the reserve oil tank is connected with the air inlet end of the compressor through the regulating branch, and the pressure of the reserve oil tank is regulated by controlling the on-off of the first valve body.

3. The oil replenishing device suitable for the screw chiller system according to any one of claims 1 or 2, wherein: the oil return device is characterized by further comprising an oil return pipeline, the spare oil tank is connected with the oil separator through the oil return pipeline, and the pressure adjusting assembly is matched with the switching assembly to control the on-off of the oil return pipeline.

4. The oil replenishing device for a screw chiller system according to claim 3, wherein: the switching assembly comprises a second valve body arranged in the oil supplementing pipeline and a third valve body arranged in the oil returning pipeline.

5. The oil replenishing device for a screw chiller system according to claim 2, wherein: the reserve oil tank is higher in position in the vertical direction than the compressor.

6. The oil replenishing device suitable for the screw chiller system according to claim 4, wherein: all valve bodies are normally closed and are electromagnetic valves.

7. The oil replenishing device suitable for the screw chiller system according to any one of claim 6, wherein: mend oily device still includes control assembly, first oil content detector and second oil content detector, first oil content detector set up in the highest oil level of compressor oil groove, second oil content detector set up in the highest oil level of reserve tank, first oil content detector second oil content detector and all valve bodies respectively with control assembly electric connection.

8. The oil replenishing device for a screw chiller system according to claim 1, wherein: the pressure adjusting assembly is communicated with the top of the reserve oil tank.

9. The oil replenishing device for a screw chiller system according to claim 1, wherein: the compressor oil storage cavity is communicated with the bottom of the reserve oil tank.

10. A screw chiller system characterized in that: the oil supplementing device suitable for the screw chiller system comprises any one of claims 1 to 9.

11. An oil return method of a screw type water chilling unit system is characterized in that: the oil supplementing device suitable for the screw type chiller system comprises any one of claims 1 to 9, and the oil return step comprises the following steps:

the method comprises the following steps: when the unit displays a fault of a compressor oil level switch and stops due to the fault, an oil supplementing pipeline is communicated, so that oil enters an oil storage cavity of the compressor from the oil supplementing pipeline under the action of a pressure regulating assembly to supplement the oil;

step two: the oil level of the compressor rises until the fault alarm of the oil level switch of the compressor is relieved, and the oil supplementing pipeline is disconnected;

step three: the unit is started, the oil return of the unit is manually adjusted through the conventional technology, and the oil level in the compressor rises to realize the oil return.

12. The screw chiller system oil return method of claim 11, wherein: the oil level of the compressor is increased to the highest oil level in the third step, the oil return pipeline is communicated, and under the pressure difference between the pressure regulating assembly and the unit oil separator, oil flows into the spare oil tank from the unit oil separator; and when the oil in the spare oil tank rises to the highest position, the oil return pipeline is disconnected, and the oil return of the spare oil tank is finished.

Technical Field

The invention relates to the technical field of air conditioners, in particular to an oil supplementing device, a screw type water chilling unit system and an oil returning method.

Background

The refrigeration oil is an important lubricant for the operation of the screw type refrigeration compressor, has the functions of lubrication, sealing, temperature reduction, energy regulation and the like, and plays an extremely important role in ensuring the operation reliability and the service life of the compressor. The water-cooled screw water chilling unit adopting the flooded evaporator has the advantages that the oil leakage of the screw compressor is an urgent problem to be solved by various large air conditioner manufacturers, and the oil leakage seriously causes the low oil level in the compressor and the fault shutdown. The common way is to adjust the opening of the electronic expansion valve logically or manually by restarting the engine, so that the unit has a large pressure difference, and the oil which runs into the system returns to the compressor for oil return. However, when the oil return rate is low, the oil level still cannot meet the requirement within a certain time, so that the unit is stopped again, and the reliability and the working efficiency of the unit are affected.

Disclosure of Invention

The invention aims to provide an oil supplementing device, a screw type water chilling unit system and an oil return method, and aims to solve the technical problems that in the prior art, the compressor is stopped due to low oil level, and the unit is stopped again due to the fact that the oil level cannot meet the requirement within a certain time after oil return is manually debugged, so that the working efficiency is affected.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides an oil supplementing device suitable for a screw type water chilling unit system, which comprises a spare oil tank, a pressure regulating assembly and a switching assembly, wherein the spare oil tank is connected with an oil storage cavity of a compressor through an oil supplementing pipeline, and the on-off of the oil supplementing pipeline can be controlled through the pressure regulating assembly and the switching assembly.

Optionally, the pressure regulating assembly comprises a regulating branch and a first valve body arranged in the regulating branch, the reserve oil tank is connected with the air inlet end of the compressor through the regulating branch, and the pressure of the reserve oil tank is regulated by controlling the switch of the first valve body.

Optionally, the oil separator further comprises an oil return pipeline, the spare oil tank is connected with the oil separator through the oil return pipeline, and the pressure adjusting assembly is matched with the switching assembly to control the on-off of the oil return pipeline.

Optionally, the switching assembly includes a second valve body disposed in the oil supply line and a third valve body disposed in the oil return line.

Optionally, the reserve oil tank is located higher in the vertical direction than the compressor.

Optionally, all valve bodies are normally closed and are solenoid valves.

Optionally, the oil supplementing device further includes a control component, a first oil content detector and a second oil content detector, the first oil content detector is disposed at the highest oil level of the compressor oil tank, the second oil content detector is disposed at the highest oil level of the reserve oil tank, and the first oil content detector, the second oil content detector and all the valve bodies are electrically connected to the control component respectively.

Optionally, the pressure regulating assembly is in communication with the reserve tank top.

Optionally, the compressor oil storage chamber is communicated with the bottom of the reserve oil tank.

A screw chiller system comprises the oil supplementing device suitable for the screw chiller system.

An oil return method of a screw type water chilling unit system comprises the oil supplementing device suitable for the screw type water chilling unit system, and the oil return steps are as follows:

the method comprises the following steps: when the unit displays a fault of a compressor oil level switch and stops due to the fault, an oil supplementing pipeline is communicated, so that oil enters an oil storage cavity of the compressor from the oil supplementing pipeline under the action of a pressure regulating assembly to supplement the oil;

step two: the oil level of the compressor rises until the fault alarm of the oil level switch of the compressor is relieved, and the oil supplementing pipeline is disconnected;

step three: the unit is started, the oil return of the unit is manually adjusted through the conventional technology, and the oil level in the compressor rises to realize the oil return.

Optionally, the oil separator further comprises an oil return pipeline, in the third step, when the oil level of the compressor rises to the highest oil level, the oil return pipeline is communicated, and under the pressure difference between the pressure regulating assembly and the unit oil separator, the oil flows into the spare oil tank from the unit oil separator; and when the oil in the spare oil tank rises to the highest position, the oil return pipeline is disconnected, and the oil return of the spare oil tank is finished.

The invention provides an oil supplementing device suitable for a screw type water chilling unit system, which has the beneficial effects that when a compressor is in fault shutdown due to low oil level, the on-off of an oil supplementing pipeline is controlled by a pressure regulating assembly and a switching assembly to return oil to a compressor oil storage tank in advance, so that the phenomenon that the compressor is in shutdown again due to the fact that oil cannot be returned in time in the compressor oil storage cavity after oil is returned through manual debugging is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of an overall structure of an oil supply device suitable for a screw chiller system according to the present invention;

fig. 2 is a schematic structural diagram of a screw chiller system.

In the figure 1, a spare oil tank; 2. adjusting the branch; 3. a first valve body; 4. an oil supplementing pipeline; 5. an oil return line; 6. a compressor; 7. an oil storage chamber; 8. an air inlet end; 9. an oil separator; 10. a second valve body; 11. a third valve body.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

The invention provides an oil supplementing device suitable for a screw type water chilling unit system, which comprises a spare oil tank 1, a pressure regulating assembly and a switching assembly, wherein the spare oil tank 1 is connected with an oil storage cavity 7 of a compressor 6 through an oil supplementing pipeline 4, and the on-off of the oil supplementing pipeline 4 can be controlled through the pressure regulating assembly and the switching assembly; meanwhile, a convenient method is provided for supplementing the refrigeration oil.

As an optional implementation manner, the pressure regulating assembly comprises a regulating branch 2 and a first valve body 3 arranged in the regulating branch 2, the reserve oil tank 1 is connected with an air inlet end 8 of the compressor 6 through the regulating branch 2, and the pressure of the reserve oil tank 1 is regulated by controlling the opening and closing of the first valve body 3; when the unit is shut down and oil needs to be supplemented by the spare oil tank 1, the adjusting branch 2 and the oil supplementing pipeline 4 are communicated to enable the spare oil tank 1 to supplement oil for the oil storage cavity 7 of the compressor 6, when oil supplement is finished, the adjusting branch 2 and the oil supplementing pipeline 4 are disconnected, oil supplement work of the spare oil tank 1 is finished, and then the unit is operated to carry out a normal oil return process of the compressor 6.

As an optional implementation mode, the oil separator further comprises an oil return pipeline 5, the reserve oil tank 1 is connected with the oil separator 9 through the oil return pipeline 5, and the pressure adjusting assembly is matched with the switching assembly to control the on-off of the oil return pipeline 5.

The invention also comprises an oil return pipeline 5, the spare oil tank 1 is connected with the oil separator 9 through the oil return pipeline 5, the pressure regulating assembly is matched with the switching assembly to control the on-off of the oil return pipeline 5, when the spare oil tank 1 finishes the oil return work of the compressor 6 and starts the unit to run, the pressure regulating assembly can provide certain negative pressure for the mailbox, and meanwhile, the switching assembly is communicated with the oil return pipeline 5, so that the oil in the oil separator 9 can flow back to the spare oil tank 1 to prepare for the next oil return work.

As an alternative embodiment, the switching assembly comprises a second valve body 10 arranged in the oil supply line 4 and a third valve body 11 arranged in the oil return line 5, facilitating the communication and disconnection of the passages.

As an alternative embodiment, the reserve oil tank 1 is located at a position higher than the position of the compressor 6 in the vertical direction.

The position of the spare oil tank 1 in the vertical direction is higher than that of the compressor 6, so that the refrigeration oil can be ensured to be supplemented into the oil storage cavity 7 of the compressor 6 from the spare oil tank 1 by means of the self gravity under the condition that the oil supplementing pipeline 4 is communicated with the adjusting branch 2, and the structure is simple and practical.

As an optional implementation mode, all the valve bodies are normally closed and are electromagnetic valves, and the normally closed valve bodies can ensure that the normal operation of the unit is not influenced by the oil supplementing device under the normal operation of the unit; the valve bodies are all electromagnetic valves, so that the device can be controlled more conveniently.

As an optional embodiment, the oil supplementing device further comprises a control component, a first oil content detector and a second oil content detector, wherein the first oil content detector is arranged at the highest oil level of the oil tank of the compressor 6, the second oil content detector is arranged at the highest oil level of the reserve oil tank 1, and the first oil content detector, the second oil content detector and all the valve bodies are respectively electrically connected with the control component; when the oil returns to the compressor 6 in the traditional mode, when the oil level rises to the highest oil level of an oil groove of the compressor 6, the controller receives a signal of the first oil content detector to control the first valve body 3 and the third valve body 11 to be opened, so that the refrigeration oil returns to the spare oil tank 1 from the oil separator 9 under the action of negative pressure brought by the adjusting branch 2; when the oil reaches the highest position of the reserve oil tank 1, the controller receives a signal of the second oil content detector to close the first valve body 3 and the third valve, oil return of the reserve oil tank 1 is finished, and preparation is made for oil return of the compressor 6 next time.

As an alternative embodiment, the pressure regulating assembly is communicated with the top of the reserve tank 1, so as to communicate the atmospheric pressure or provide the negative pressure for the reserve tank 1 without oil flowing into the pressure regulating assembly.

As an optional implementation mode, the oil storage cavity 7 of the compressor 6 is communicated with the bottom of the reserve oil tank 1, so that oil can be returned to the reserve oil tank 1 conveniently, and the oil return efficiency of the reserve oil tank 1 is higher.

A screw chiller system comprises the oil supplementing device suitable for the screw chiller system.

The screw type water chilling unit system can control the on-off of the oil supplementing pipeline 4 to return oil to the oil storage tank of the compressor 6 in advance through the pressure adjusting assembly and the switching assembly when the compressor 6 is shut down due to low oil level, so that the phenomenon that the compressor 6 cannot be shut down again due to the fact that oil cannot be returned in time in the oil storage cavity 7 of the compressor 6 after oil return is debugged manually is avoided.

An oil return method of a screw type water chilling unit system comprises the oil supplementing device suitable for the screw type water chilling unit system, and the oil return steps are as follows:

the method comprises the following steps: when the unit displays the oil level switch fault of the compressor 6, the unit is in fault shutdown, and then the oil supplementing pipeline 4 is communicated, so that oil enters the oil storage cavity 7 of the compressor 6 from the oil supplementing pipeline 4 under the action of the pressure regulating assembly to supplement the oil;

step two: the oil level of the compressor 6 rises until the fault alarm of the oil level switch of the compressor 6 is relieved, and the oil supplementing pipeline 4 is disconnected;

step three: the unit is started, and the oil return of the unit is manually adjusted through the conventional technology, so that the oil level in the compressor 6 is raised to realize oil return, and the compressor 6 is enabled to normally run.

As an optional embodiment, the oil-saving system further comprises an oil return pipeline 5, in the third step, when the oil level of the compressor 6 rises to the highest oil level, the oil return pipeline 5 is communicated, and under the pressure difference between the pressure regulating assembly and the unit oil separator 9, the oil flows into the spare oil tank 1 from the unit oil separator 9; and when the oil in the spare oil tank 1 rises to the highest position, the oil return pipeline 5 is disconnected, and the oil return of the spare oil tank 1 is finished.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.