阅读说明：本技术 引射系统及冷水机组的回油系统、控制方法、冷水机组 (Ejection system and the oil return system of water cooler, control method, water cooler ) 是由 梁相之 周卫华 黄童毅 黄千泽 罗建飞 于 2019-07-25 设计创作，主要内容包括：本发明提供了一种引射系统及冷水机组的回油系统、控制方法、冷水机组,涉及回油控制技术领域。其中引射系统包括：第一引射器,所述第一引射器具有第一高压入口、第一混合入口及第一出口,所述第一高压入口用于通入高压气态冷媒,所述第一混合入口用于通入油及液态冷媒混合液；所述第一出口通过第一支路与油箱连通,所述第一支路上设置有第一电磁阀；第一出口通过第二支路与压缩机的吸气口连通,第二支路上设置有第二电磁阀。当导叶开度大、叶轮吸气能力强时,通过控制第一电磁阀打开使第一支路连通,控制第二电磁阀关闭使第二支路断开,使得经过第一引射器引射的油直接进入油箱,不会在压缩机的吸气口被气流带走,避免油箱缺油现象。(The present invention provides a kind of ejection system and the oil return system of water cooler, control method, water coolers, are related to oil return control technology field.Wherein ejection system includes: the first injector, first injector has the first high pressure entry, the first mixing entrance and first outlet, first high pressure entry is for being passed through high-pressure gaseous refrigerant, and the first mixing entrance is for being passed through oil and liquid refrigerants mixed liquor；The first outlet is connected to by the first branch with fuel tank, and the first solenoid valve is provided in the first branch；First outlet is connected to by second branch with the air entry of compressor, and second solenoid valve is provided in second branch.When guide vane opening is big, impeller gettering ability is strong, the first branch is connected to by control the first solenoid valve opening, control second solenoid valve closing disconnects second branch, so that being directly entered fuel tank by the oil of the first injector injection, it will not be entrained by the flow of air in the air entry of compressor, avoid fuel tank petrol starvation.)

1. a kind of ejection system characterized by comprising the first injector (5), first injector (5) are high with first It is pressed into mouth (51), the first mixing entrance (52) and first outlet (53), first high pressure entry (51) is for being passed through high pressure gas State refrigerant, first mixing entrance (52) is for being passed through oil and liquid refrigerants mixed liquor；The first outlet (53) passes through the One branch is connected to fuel tank (4), and the first solenoid valve (7) are provided in the first branch；The first outlet (53) passes through the Two branches are connected to the air entry (11) of compressor (1), and second solenoid valve (8) are provided in the second branch.

2. ejection system according to claim 1, which is characterized in that further include: the second injector (6), described second draws Emitter (6) has the second high pressure entry (61), inlet port (62) and second outlet (63)；

Second high pressure entry (61) is connected to the first row port (12) of compressor (1), the inlet port (62) and compression The air entry (11) of machine (1) is connected to, and the second outlet (63) is connected to by pipeline with fuel tank (4), is provided on the pipeline Third solenoid valve (9).

3. a kind of oil return system of water cooler characterized by comprising compressor (1), condenser (2), evaporator (3), oil Case (4) and the described in any item ejection systems of claim 1-2；

First injector (5) is connected to by first high pressure entry (51) with the condenser (2), first injection Device (5) is connected to by first mixing entrance (52) with the evaporator (3), and described the first of first injector (5) Outlet (53) is connected to by the second branch with the air entry (11) of the compressor (1), the institute of first injector (5) It states first outlet (53) and is connected to by the first branch with fuel tank (4).

4. the oil return system of water cooler according to claim 3, which is characterized in that the ejection system further includes second Injector (6), second injector (6) have the second high pressure entry (61), inlet port (62) and second outlet (63)；It is described Second high pressure entry (61) is connected to the first row port (12) of the compressor (1), the inlet port (62) and the compression The air entry (11) of machine (1) is connected to.

5. the oil return system of water cooler according to claim 4, which is characterized in that setting inside the compressor (1) There is spiral case, the first row port (12) is the exhaust outlet of the spiral case.

6. a kind of control method of the oil return system of water cooler, which comprises the steps of:

Detect the actual frequency of compressor (1) or the practical aperture of compressor (1) interior guide vane；

When actual frequency is greater than or equal to the practical aperture of first frequency threshold value or guide vane more than or equal to aperture threshold value, control The first solenoid valve (7) opening is made, second solenoid valve (8) is closed, so that first of the injection through first injector (5) mixes Liquid stream enters fuel tank (4).

7. the control method of the oil return system of water cooler according to claim 6, which is characterized in that further include walking as follows It is rapid:

When actual frequency is less than the practical aperture of first frequency threshold value or guide vane less than aperture threshold value, the first solenoid valve is controlled (7) it closes, second solenoid valve (8) and third solenoid valve (9) are opened；

So as to enter the air-breathing of compressor (1) by second solenoid valve (8) by first mixed liquor of the first injector (5) injection Mouth (11)；Oil in first mixed liquor enters the second injector (6) by inlet port (62), the first row port of compressor (1) (12) high-pressure gaseous refrigerant at enters the second injector (6) by the second high pressure entry (61), by the second injector (6) Second mixed liquor enters fuel tank (4) by third solenoid valve (9).

8. a kind of water cooler, which is characterized in that the oil return system including the described in any item water coolers of claim 3-5.

9. water cooler according to claim 8, which is characterized in that the compressor (1) has second exhaust port (13), The second exhaust port (13) is connected to condenser (2).

10. water cooler according to claim 8, which is characterized in that the fuel tank (4) passes through oil pump and the compressor (1) it is connected to.

Oil return control technology field of the present invention, in particular to a kind of ejection system and the oil return system of water cooler, Control method, water cooler.

Water cooler (or air-conditioning system) is common refrigeration equipment, generally comprises centrifugal compressor.Water cooler In the process of running, since compressor rotary speed is high, capacity is big, bring oil drain quantity is also big therewith, therefore is typically necessary and sets Special oil return path is set, the oil extraction of compressor is recycled.

Oil return is usually carried out by level-one injection and second level injection in the prior art, level-one injection oil return is drawn from condenser High-pressure gaseous refrigerant enters injector out, and the mixing liquid containing lubricating oil and liquid refrigerants is pumped out from evaporator, is mixed into Enter at compressor air suction mouth, the refrigerant gas at air entry is compressed by the compressor.Oil at air entry further utilizes second level Injection recycling, second level injection are cold by condenser high-pressure gaseous by second of injection by the lubricating oil for being deposited on compressor air suction mouth Matchmaker pumps out, and is mixed into fuel tank.

Centrifugal compressor is often will appear the low abnormal problem of oil level, one of most important reason after sale at present Because the oil that level-one injection is purified can not be retained in air entry, directly by gas when guide vane opening is big, impeller gettering ability is strong Stream is taken away, and will lead to fuel tank petrol starvation for a long time.

To solve, level-one injection oil can not be of the invention the technical issues of compressor air suction mouth retains in the prior art Main purpose is, provides a kind of ejection system and the oil return system of water cooler, control method, water cooler.

In a first aspect, the embodiment of the invention provides a kind of ejection systems, comprising: the first injector, first injection Device has the first high pressure entry, the first mixing entrance and first outlet, first high pressure entry cold for being passed through high-pressure gaseous Matchmaker, the first mixing entrance is for being passed through oil and liquid refrigerants mixed liquor；The first outlet passes through the first branch and fuel tank It is connected to, is provided with the first solenoid valve in the first branch；The first outlet passes through the air entry of second branch and compressor It is connected to, is provided with second solenoid valve in the second branch.

Further, in a preferred embodiment of the invention, further includes: the second injector, second injector With the second high pressure entry, inlet port and second outlet；

Second high pressure entry is connected to the first row port of compressor, and the air entry of the inlet port and compressor connects Logical, the second outlet is connected to by pipeline with fuel tank, and third solenoid valve is provided on the pipeline.

Second aspect, one embodiment of the invention provide a kind of oil return system of water cooler, comprising: compressor, condensation Device, evaporator, fuel tank and described in any item ejection systems；

First injector is connected to by first high pressure entry with the condenser, and first injector passes through The first mixing entrance is connected to the evaporator, and the first outlet of first injector passes through the second branch It is connected to the air entry of the compressor, the first outlet of first injector is connected by the first branch and fuel tank It is logical.

Further, in a preferred embodiment of the invention, the ejection system further includes the second injector, described Second injector has the second high pressure entry, inlet port and second outlet；The of second high pressure entry and the compressor The connection of one exhaust outlet, the inlet port are connected to the air entry of the compressor.

Further, in a preferred embodiment of the invention, the compressor is internally provided with spiral case, and described first Exhaust outlet is the exhaust outlet of the spiral case.

The third aspect, the embodiment of the invention provides a kind of control method of the oil return system of water cooler, including it is as follows Step:

Detect the practical aperture of guide vane in compressor actual frequency or compressor；

When the practical aperture that actual frequency is greater than or equal to first frequency threshold value or guide vane is greater than or equal to aperture threshold value When, the first solenoid valve of control is opened, and second solenoid valve is closed, so that the first mixing liquid stream of the injection through first injector Enter fuel tank.

Further, further include following steps in a preferred embodiment of the invention:

When actual frequency is less than the practical aperture of first frequency threshold value or guide vane less than aperture threshold value, the first electricity of control Magnet valve is closed, and second solenoid valve and third solenoid valve are opened；

So as to enter the air entry of compressor by second solenoid valve by the first mixed liquor of the first injector injection；The Oil in one mixed liquor enters the second injector by inlet port, and the high-pressure gaseous refrigerant at the first row port of compressor passes through Second high pressure entry enters the second injector, enters fuel tank by third solenoid valve by the second mixed liquor of the second injector.

Fourth aspect, the embodiment of the invention provides a kind of water coolers, returning including described in any item water coolers Oil system.

Further, in a preferred embodiment of the invention, the compressor has a second exhaust port, and described second Exhaust outlet is connected to condenser.

Further, in a preferred embodiment of the invention, the fuel tank is connected to by oil pump with the compressor.

A kind of ejection system provided in an embodiment of the present invention and the oil return system of water cooler, control method, water cooler, Wherein in ejection system, the first outlet side of the first injector is provided with two branches, and in the first branch and second branch Provided with solenoid valve.When guide vane opening is big, impeller gettering ability is strong, first can be made by control the first solenoid valve opening Road connection, and controlling second solenoid valve closing disconnects second branch, so that the oil by the first injector injection is direct Into fuel tank, without the air entry of compressor, it would not be also entrained by the flow of air in the air entry of compressor, avoid fuel tank oil starvation Phenomenon.

It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root Other relevant attached drawings are obtained according to these attached drawings.

Fig. 1 is the schematic diagram of the oil return system for the water cooler that one embodiment of the invention provides.

Appended drawing reference:

1, compressor, 11, air entry, 12, first row port, 13, second exhaust port, 2, condenser, 3, evaporator, 4, oil Case, the 5, first injector, the 51, first high pressure entry, the 52, first mixing entrance, 53, first outlet, the 6, second injector, 61, Second high pressure entry, 62, inlet port, 63, second outlet, the 7, first solenoid valve, 8, second solenoid valve, 9, third solenoid valve.

Specific embodiment

It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the application embodiment Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root Other relevant attached drawings are obtained according to these attached drawings.

One embodiment of the invention provide a kind of water cooler, including compressor 1, condenser 2, evaporator 3, fuel tank 4 and Oil return system, compressor 1 are internally provided with spiral case and guide vane, and compressor 1 has air entry 11, first row port 12 and second row Port 13, wherein first row port 12 refers to the exhaust outlet of spiral case.The second exhaust port 13 of compressor 1 and the refrigerant of condenser 2 enter Mouth connection, the refrigerant exit of condenser 2 are connected to the refrigerant inlet of evaporator 3；Fuel tank 4 is connected to by oil pump with compressor 1, The outlet of fuel tank 4 is connected to the entrance of oil pump, and the outlet of oil pump is connected to the oiler of compressor 1；Oil pump is by the oil in fuel tank 4 It is pumped into compressor 1 and is used for compressor 1.

Wherein, the oil return system provided in the embodiment of the present invention is realized using ejection system.

As shown in Figure 1, a kind of ejection system that one embodiment of the invention provides, comprising: the first injector 5, described first Injector 5 has the first high pressure entry 51, first mixing entrance 52 and first outlet 53, and first high pressure entry 51 is for leading to Enter high-pressure gaseous refrigerant, the first mixing entrance 52 is for being passed through oil and liquid refrigerants mixed liquor；The first outlet 53 is logical It crosses the first branch to be connected to fuel tank 4, the first solenoid valve 7 is provided in the first branch；The first outlet 53 passes through second Branch is connected to the air entry 11 of compressor 1, and second solenoid valve 8 is provided in the second branch.Wherein in ejection system, the 53 side of first outlet of one injector 5 is provided with two branches, and is provided with solenoid valve in the first branch and second branch.When When guide vane opening is big, impeller gettering ability is strong, the first branch can be made to be connected to by control the first solenoid valve 7 opening, and control The closing of second solenoid valve 8 disconnects second branch, so that being directly entered fuel tank 4 by the oil of 5 injection of the first injector, no By the air entry 11 of compressor 1, it would not be also entrained by the flow of air in the air entry 11 of compressor 1, lead to petrol starvation.

In the prior art, if series connection one second level injection and bypass 1 entrance of compressor, asked although being able to solve 4 oil starvation of fuel tank Topic, but run in the case where underload oil temperature is low when water cooler, excessive refrigerant can direct injection enter fuel tank 4, lead It causes oil temperature supplying low, influences unit reliability.Therefore how to grasp oil temperature and the balance of oil return is also a problem.The present invention In one embodiment, ejection system further include: the second injector 6, second injector 6 have the second high pressure entry 61, oil suction Mouth 62 and second outlet 63；Second high pressure entry 61 is connected to the first row port 12 of compressor 1, the inlet port 62 with The air entry 11 of compressor 1 is connected to, and the second outlet 63 is connected to by pipeline with fuel tank 4, is provided with third on the pipeline Solenoid valve 9.Level-one injection is still kept to enter at the air entry 11 of compressor 1, water cooler is low in underload oil temperature working as In the case of, level-one injection and two can be realized by closing the first solenoid valve 7 and opening second solenoid valve 8 and third solenoid valve 9 The series connection of grade injection, the oil that 5 injection of the first injector obtains suck the second injector 6, then incoming oil under high pressure refrigerant effect Case 4, effectively stable oil temperature supplying, a large amount of direct injections of refrigerant enter fuel tank 4 in the case where preventing oil temperature itself not high, cause to supply Oil temperature is too low.By adjusting the opening and closing of the first solenoid valve 7, second solenoid valve 8 and third solenoid valve 9, can be realized prevents oil The technical effect being entrained by the flow of air；Or under conditions of underload low oil temperature, solve the problems, such as that oil temperature supplying is low.

As shown in Figure 1, showing a kind of oil return system of water cooler of one embodiment of the invention offer, the first injector 5 are connected to by first high pressure entry 51 with the condenser 2, and first injector 5 passes through the first mixing entrance 52 are connected to the evaporator 3, and the first outlet 53 of first injector 5 passes through the second branch and the compression The air entry 11 of machine 1 is connected to, and the first outlet 53 of first injector 5 is connected to by the first branch with fuel tank 4. In the present embodiment, the ejection system further includes the second injector 6, and second injector 6 has the second high pressure entry 61, inhales Hydraulic fluid port 62 and second outlet 63；Second high pressure entry 61 is connected to the first row port 12 of the compressor 1, the oil suction Mouth 62 is connected to the air entry 11 of the compressor 1.The oil return line of level-one injection is connected with the oil return line of second level injection Get up, and by a solenoid valve, second solenoid valve 8 and the third solenoid valve 9 of setting, can be realized prevents oil to be entrained by the flow of air Technical effect；Or under conditions of underload low oil temperature, solve the problems, such as that oil temperature supplying is low.

In the prior art, high pressure gas of the power source of second level injection in condenser 2, but in low voltage difference or low temperature When operating condition, 2 pressure of condenser is relatively small, and injection oil return is short of power.Through analyzing, the condenser under low voltage difference or worst cold case 2 injection oil returns are short of power, and are the crushings being vented between condenser 2 due to spiral case, provide in one embodiment of the invention Oil return system in, the compressor 1 is internally provided with spiral case, and the first row port 12 is the exhaust outlet of the spiral case.It will The power source of second level injection oil return is changed to by condenser 2 from 1 volute outlet of compressor, and the pressure of spiral case exhaust ports is more filled Foot enhances ejector capacity, can satisfy the oil return power of second level injection；The pipe of the 2 to the second injector of condenser 6 is eliminated simultaneously Road, effectively saving pipeline, exhaust outlet distance the second injector 6 of spiral case is closer, reduces technology difficulty, also prevents too long Stress vibration problem caused by horizontal pipeline.

In conjunction with above-mentioned first injector 5, the second injector 6, the change of second level injection power source and above three solenoid valve Setting, the embodiment of the invention also provides a kind of control methods of the oil return system of water cooler, include the following steps:

For variable frequency centrifuge, due to first convincing leaf by patient analysis when variable frequency centrifuge load, when guide vane opening to maximum i.e. 100% When, then increase frequency；It is therefore assumed that setting first frequency threshold value when guide vane opening standard-sized sheet；Wherein, the frequency of frequency converter sets is opposite Guide vane opening influence gettering ability is bigger, and first frequency threshold value is about the 70% of maximum frequency values；

Detect the actual frequency of compressor 1；

When practical opening value standard-sized sheet, that is, guide vane opening be 100%, and actual frequency be greater than or equal to first frequency threshold value, Unit gettering ability is strong, and revolving speed is also high, and the heat transfer that bearing generates has given lubricating oil, causes oil temperature height；

The first solenoid valve 7 opening is controlled, second solenoid valve 8 and third solenoid valve 9 are closed, so that through first injector First mixed liquor of 5 injection flows into fuel tank 4, specific: the mixture of liquid refrigerants and oil in evaporator 3 is by condenser 2 Mesohigh gaseous coolant injection comes out, into the first injector 5 after become the first mixed liquor flow out, and pass through the first solenoid valve 7 Fuel tank 4 is introduced afterwards；Oil is pulled away when preventing 1 gettering ability of compressor strong, and oil in the case of high load capacity can also be effectively reduced The high problem of temperature.

Further, further include following steps:

When the guide vane standard-sized sheet of variable frequency centrifuge and actual frequency is less than first frequency threshold value, 1 unit air-breathing energy of compressor Power is small, and revolving speed is also low, and opposite heat exchange is also few to the heat of lubricating oil；

The closing of the first solenoid valve 7 is controlled, second solenoid valve 8 and third solenoid valve 9 are opened；

So as to enter the air entry of compressor 1 by second solenoid valve 8 by the first mixed liquor of 5 injection of the first injector 11；Oil in first mixed liquor enters the second injector 6 by inlet port 62, the high pressure at the first row port 12 of compressor 1 Gaseous coolant enters the second injector 6 by the second high pressure entry 61, and the second mixed liquor by the second injector 6 passes through third Solenoid valve 9 enters fuel tank 4, specific:

Liquid refrigerants and oil mixture in evaporator 3 are come out by the high-pressure gaseous refrigerant injection in condenser 2, into Becoming the first mixed liquor after one injector 5 to flow out, the first mixed liquor enters the air entry 11 of compressor 1 by second solenoid valve 8, The refrigerant in the second mixed liquor is inhaled into compressor 1 and is compressed at this time；Oil in second mixed liquor is deposited on 1 entrance of compressor Place, it is mixed with second by the second injector 6 by being pumped out from the high-pressure gaseous refrigerant of first row port 12 (spiral case exhaust outlet) The form outflow of liquid is closed, the second mixed liquor enters fuel tank 4 by third solenoid valve 9；This situation both can guarantee that gettering ability was weak When, the oil of 1 entrance of compressor will not be sucked away, while the refrigerant that injection enters in fuel tank 4 greatly reduces, and makes in underload Low frequency script oil temperature will not it is very high in the case where, oil temperature supplying keep stablize, improve unit reliability.

Wherein, in the above method first row port 12 be spiral case exhaust outlet so that the power source of script second level injection by Condenser 2 is changed at the spiral case exhaust of compressor 1, enhances the pressure of the second injector 6, while reducing 1 spiral case of compressor It is short much compared to the pipeline for introducing the second injector 6 from condenser 2 by the crushing of exhaust pipe to condenser 2 at exhaust, drop Low technology difficulty and stress problem.

For determining frequency unit, only by guide vane opening adjusting gettering ability, while gettering ability when guide vane opening is big By force, while high load capacity does work, and delivery temperature is high, and electric current height causes oil temperature also high, that is, a guide vane opening threshold value is set, with guide vane Standard-sized sheet is 100%, and leading leaf divergence threshold value herein is about 45%.

When practical guide vane opening is greater than or equal to aperture threshold value, 1 mode of compressor is bypassed using one second level injection of series connection Carry out oil return: the first solenoid valve 7 of control is opened, and second solenoid valve 8 is closed, so that the of the injection through first injector 5 One mixed liquor flows into fuel tank 4；Specifically, the refrigerant in the high-pressure gaseous refrigerant suction evaporator 3 that condenser 2 is drawn is mixed with oily Object is closed, directly passes through the first solenoid valve 7 (second solenoid valve 8 and third at this time by the first mixed liquor of 5 injection of the first injector Solenoid valve 9 is closed) fuel tank is arrived, do not need second level injection.

When practical guide vane opening is less than aperture threshold value, using level-one second level injection circuit: the first solenoid valve 7 of control It closes, second solenoid valve 8 and third solenoid valve 9 are opened, and specific condenser 2 is drawn in high-pressure gaseous refrigerant suction evaporator 3 Refrigerant and oil mixture, by 5 injection of the first injector the first mixed liquor by second solenoid valve 8 (at this time first electricity Magnet valve 7 is closed) and then arrive at 1 air entry 11 of compressor (level-one injection process)；Liquid refrigerants at air entry 11 flashes into gas State is sucked by compressor 1, and lubricating oil stays at 1 air entry 11 of compressor, and the second injector 6 is by from 12 (snail of first row port Shell exhaust outlet) injection goes out high-pressure gaseous refrigerant, and suction stays in the lubricating oil of 1 air entry 11 of compressor, and (lubricating oil passes through inlet port 62 enter the second injector 6), and pass through the most Zhongdao fuel tank 4 of third solenoid valve 9 (second level injection process).

In the description of the present invention, it is to be understood that, term " on ", "lower", "vertical", "horizontal", "top", "bottom", The orientation or positional relationship of the instructions such as "inner", "outside", " clockwise ", " counterclockwise " is that orientation based on the figure or position are closed System.It is merely for convenience of description of the present invention and simplification of the description, rather than the equipment of indication or suggestion meaning or element must have Specific orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more, Unless otherwise specifically defined.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings Condition understands the concrete meaning of above-mentioned term in the present invention.

The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.