CN206269411U - Screw-type water chiller - Google Patents
Screw-type water chiller Download PDFInfo
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- CN206269411U CN206269411U CN201621385018.9U CN201621385018U CN206269411U CN 206269411 U CN206269411 U CN 206269411U CN 201621385018 U CN201621385018 U CN 201621385018U CN 206269411 U CN206269411 U CN 206269411U
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- China
- Prior art keywords
- compressor
- oil eliminator
- exhaust outlet
- control valve
- oil
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Abstract
The utility model is related to a kind of screw-type water chiller, including compressor, the first oil eliminator being connected with the exhaust outlet of described compressor all the time, the second oil eliminator that can be connected with the exhaust outlet of described compressor；Described handpiece Water Chilling Units also include the piston mechanism for controlling the exhaust outlet of described compressor whether to be connected with the second described oil eliminator, when described handpiece Water Chilling Units are in underload working condition, the first only described oil eliminator is connected with the exhaust outlet of described compressor；When described handpiece Water Chilling Units are in normal duty working condition, the exhaust outlet of described the first oil eliminator, the second oil eliminator respectively with described compressor is connected.The utility model allows refrigerant by another oil eliminator by closing an oil eliminator, can significantly reduce the minimum load that can be unloaded of unit, thoroughly solves the mistake oil problem of unit.
Description
Technical field
The utility model is related to refrigerating field, more particularly to a kind of screw-type water chiller.
Background technology
As shown in Figure 1：Oil/refrigerant mixture is from compressor out later by oil eliminator, the oil entrance after separation
Fuel tank, oil is again introduced into compressor and is lubricated in the presence of system pressure difference, into the oil in evaporator then by air pump or
Person's injector returns compressor.Under big pressure difference small load condition is operated in, it is found that the oil in fuel tank is gradually decreased, evaporator
Interior oil concentration increases, and when load reduces to a certain extent, oil level drops to 0 in fuel tank, mistake oil just occurs and shuts down.
For centrifugal oil separator, the separative efficiency of oil is influenceed by oil gas flow velocity, as shown in Fig. 21 micron of diameter
Oil droplet above increases with the increase oil efficiency of flow velocity；For screw machine, more than 1 micron of oil droplet is accounted for absolutely mostly
Number, thus with the reduction of load, the reduction of oil efficiency, simultaneously because screw machine is by system pressure difference oil return, when unit fortune
Capable oily flow increases under big pressure difference operating mode, and oil need oil to be processed also increases.If now oil efficiency is reduced to necessarily
Degree, more than the oil returned from evaporator by air pump, lubricating oil will be gradually decreased the oil into refrigeration system in fuel tank, be led
Cause system loses oil.
The content of the invention
The purpose of this utility model is to provide a kind of screw-type water chiller, can solve the problem that helical-lobe compressor in big pressure difference work
The problem compared with underload can not be unloaded under condition, it is ensured that oil is not lost under Smaller load.
To reach above-mentioned purpose, the technical solution adopted in the utility model is：
A kind of screw-type water chiller, including compressor, be connected with the exhaust outlet of described compressor all the time first
Oil eliminator, the second oil eliminator that can be connected with the exhaust outlet of described compressor；Described handpiece Water Chilling Units also include
For the piston mechanism whether exhaust outlet for controlling described compressor connects with the second described oil eliminator, when described cold
When water dispenser group is in underload working condition, the first only described oil eliminator is connected with the exhaust outlet of described compressor；
When described handpiece Water Chilling Units are in normal duty working condition, described the first oil eliminator, the second oil eliminator respectively with
The exhaust outlet of described compressor is connected.
Preferably, the exhaust outlet of described compressor, air entry are connected by the first connecting line, described first
The first control valve, the second control valve are disposed with connecting line, are connected between the first described control valve and the second control valve
It is connected to the second connecting line being connected with described piston mechanism.
It is further preferred that when the first described control valve opening, the second described control valve are closed, described piston
The second oil eliminator described in mechanism controls is not connected with the exhaust outlet of described compressor；When the first described control valve is closed
Close, when described second control valve is opened, described piston mechanism control described the second oil eliminator and described compressor
Exhaust outlet connection.
It is further preferred that described compressor has two exhaust outlets, the exhaust outlet of the compressor described in only one, suction
The first described connecting line of gas port connection.
It is further preferred that described first controls valve, second to control valve for magnetic valve.
Preferably, the first described oil eliminator is directly connected with described exhaust outlet of compressor；The second described oil
It is connected with the exhaust outlet of described compressor by described piston mechanism from device.
Preferably, described handpiece Water Chilling Units are described underload working condition when load is in less than 25% scope；Institute
The handpiece Water Chilling Units stated are described normal duty working condition when load is in 25% range above.
Because above-mentioned technical proposal is used, the utility model has following advantages compared with prior art：
The utility model allows refrigerant by another oil eliminator by closing an oil eliminator, can significantly drop
The minimum load that can be unloaded of low unit, thoroughly solves the mistake oil problem of unit.
Brief description of the drawings
Accompanying drawing 1 is screw-type water chiller oil system figure in the prior art；
Accompanying drawing 2 is oil gas flow velocity in the prior art and separation relationship figure；
Accompanying drawing 3a is the break-make schematic diagram in oil eliminator under Smaller load in the present embodiment；
Accompanying drawing 3b is the volume break-make schematic diagram in oil eliminator under normal duty in the present embodiment；
Accompanying drawing 4 is D1 compressors（Two oil eliminators）Load and time chart；
Accompanying drawing 5 is B2 compressors（One oil eliminator）Load and time chart.
Wherein：10th, exhaust outlet；11st, air entry；20th, the first oil eliminator；21st, the second oil eliminator；3rd, piston mechanism；
30th, plug sleeve；31st, chock plug；32nd, blocking part；33rd, spring；4th, the first connecting line；50th, the first control valve；51st, the second control valve；
6th, the second connecting line.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment is further described to the utility model：
A kind of screw-type water chiller, including the first oil eliminator that compressor is connected with the exhaust outlet 10 of compressor
20th, the second oil eliminator 21.Handpiece Water Chilling Units are underload working condition when load is in less than 25% scope；Handpiece Water Chilling Units exist
It is normal duty working condition when load is in 25% range above.Big pressure difference and Smaller load work are operated in order to solve cooling-water machine
The problem of oil is lost under condition, in the present embodiment：When handpiece Water Chilling Units are in underload working condition, only the first oil eliminator 20 with
The exhaust outlet 10 of compressor is connected；When handpiece Water Chilling Units are in normal duty working condition, first the 20, second oil of oil eliminator
Separator 21 is connected with the exhaust outlet 10 of compressor respectively.
In the present embodiment：Compressor sets two exhaust outlets 10, is provided for control on an exhaust outlet 10 wherein
The piston mechanism 3 whether exhaust outlet 10 of compressor connects with the second oil eliminator 21, the first oil eliminator 20 and compressor
Exhaust outlet 10 is directly connected；Second oil eliminator 21 is connected by piston mechanism 3 with the exhaust outlet 10 of compressor.
The mode of control piston mechanism is specific as follows in the present embodiment：The exhaust outlet 10 of compressor, air entry 11 pass through
First connecting line 4 is connected, and the first control valve 50, second is disposed with the first connecting line 4 and controls valve 51, first
The control control of valve 50, second valve 51 can use magnetic valve, be connected with and work between the first control control valve 51 of valve 50 and second
The second connecting line 6 that plug mechanism 3 is connected.
In the present embodiment：Piston mechanism 3 has plug sleeve 30, the chock plug 31 being arranged in plug sleeve 30, the section of chock plug 31
In I-shaped, blocking part 32 is provided with the middle part of plug sleeve 30, spring 33 is provided between chock plug 31 and blocking part 32.Wherein：Compression
The exhaust outlet 10 of machine is connected with the bottom of plug sleeve 30, and the second connecting line 6 is connected with the top of plug sleeve 30, and the second oil is separated
Device 21 is connected with the sidepiece of plug sleeve 31.
As shown in Figure 3 a：When handpiece Water Chilling Units are in underload working condition, open first and control valve 50, close the second control
Valve processed 51, piston mechanism about 3 pressure at both sides it is equal, on the top of active force chock plug 31 of spring 33 to the bottom of plug sleeve 30, compressor
Exhaust outlet 10 do not connected with plug sleeve 30 so that the second oil eliminator 21 is not connected with the exhaust outlet 10 of compressor, compressor
Exhaust outlet 10 only flows to the first oil eliminator 20, increases the flow velocity in the first oil eliminator 20, oily separating effect enhancing.
As shown in Figure 3 b：When handpiece Water Chilling Units are in normal duty working condition, close first and control valve 50, open second
Control valve 51, the top pressure of piston mechanism 3 is pressure of inspiration(Pi), and base pressure is pressure at expulsion, is moved on chock plug 31, the row of compressor
Gas port 10 is connected with plug sleeve 30 so that the second oil eliminator 21 is connected with the exhaust outlet 10 of compressor.
The minimum load that can be unloaded to when an oil eliminator works in theory is the half of double oils, with RTHD water-cooled spiral shells
As a example by rod-type handpiece Water Chilling Units, such as Fig. 4 and Fig. 5 is respectively D1 compressors（Two oil eliminators）With B2 compressors（One oil is separated
Device）Operate in the unloading situation of High Pressure Difference operating mode 40-105 points, it can be seen that while two oil eliminators work simultaneously when, system
The minimum 65ton that is unloaded to occurs to lose oily situation（Oil level is close to minimum）, and a type for oil eliminator, can be unloaded to
Below 50ton loses oil without occurring.In view of in order to prevent the second oil eliminator 21 it is long-term it is obstructed in the case of refrigerant coagulate
Tie and migration controls valve 50, opening second to control valve 51 to open a period of time of the second oil eliminator 21, it is necessary to periodically close first.
The control method of the present embodiment is as follows：
One critical extraction flow CFM of oil eliminator is calculated by system pressure difference Δ P respectivelycrit1With two oil eliminators
Critical extraction flow CFMcrit2, and the actual extraction flow CFM of real-time computer group.
If (CFM>= CFMcrit2) then
Solenoid valve1 close, Solenoid valve2 open
Else if(CFMcrit1<=CFM< CFMcrit2)
Solenoid valve1 open, Solenoid valve2 close
Else
Solenoid valve1 open, Solenoid valve2 close,
Control CFM= CFMcrit1
End if。
Above-described embodiment only to illustrate technology design of the present utility model and feature, technique is familiar with its object is to allow
Personage will appreciate that content of the present utility model and implement according to this, protection domain of the present utility model can not be limited with this.
All equivalent change or modifications made according to the utility model Spirit Essence, should all cover protection domain of the present utility model it
It is interior.
Claims (7)
1. a kind of screw-type water chiller, it is characterised in that：Exhaust outlet including compressor, all the time with described compressor is connected
Logical the first oil eliminator, the second oil eliminator that can be connected with the exhaust outlet of described compressor；Described cooling-water machine
Group also includes the piston mechanism for controlling the exhaust outlet of described compressor whether to be connected with the second described oil eliminator, when
When described handpiece Water Chilling Units are in underload working condition, the exhaust outlet of only described the first oil eliminator and described compressor
It is connected；When described handpiece Water Chilling Units are in normal duty working condition, described the first oil eliminator, the second oil eliminator
The exhaust outlet with described compressor is connected respectively.
2. screw-type water chiller according to claim 1, it is characterised in that：The exhaust outlet of described compressor, air-breathing
Mouth is connected by the first connecting line, and the first control valve, the second control are disposed with the first described connecting line
Valve, the second connecting tube being connected with described piston mechanism is connected between the first described control valve and the second control valve
Road.
3. screw-type water chiller according to claim 2, it is characterised in that：When described the first control valve opening, institute
When the second control valve stated is closed, the exhaust of described piston mechanism control described the second oil eliminator with described compressor
Mouth is not connected；When the first described control valve closing, the second described control valve are opened, described piston mechanism control is described
The second oil eliminator connected with the exhaust outlet of described compressor.
4. screw-type water chiller according to claim 2, it is characterised in that：Described compressor has two exhausts
Mouthful, the first described connecting line of the exhaust outlet of the compressor described in only one, air entry connection.
5. screw-type water chiller according to claim 2, it is characterised in that：Described the first control valve, the second control
Valve is magnetic valve.
6. screw-type water chiller according to claim 1, it is characterised in that：The first described oil eliminator with it is described
Exhaust outlet of compressor is directly connected；The exhaust that the second described oil eliminator passes through described piston mechanism with described compressor
Mouth is connected.
7. screw-type water chiller according to claim 1, it is characterised in that：Described handpiece Water Chilling Units are 25% in load
It is described underload working condition when in following scope；Described handpiece Water Chilling Units are institute when load is in 25% range above
The normal duty working condition stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621385018.9U CN206269411U (en) | 2016-12-16 | 2016-12-16 | Screw-type water chiller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621385018.9U CN206269411U (en) | 2016-12-16 | 2016-12-16 | Screw-type water chiller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206269411U true CN206269411U (en) | 2017-06-20 |
Family
ID=59046865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621385018.9U Active CN206269411U (en) | 2016-12-16 | 2016-12-16 | Screw-type water chiller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206269411U (en) |
-
2016
- 2016-12-16 CN CN201621385018.9U patent/CN206269411U/en active Active
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