CN100470054C - Oil cooling compressor - Google Patents
Oil cooling compressor Download PDFInfo
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- CN100470054C CN100470054C CNB2006100798479A CN200610079847A CN100470054C CN 100470054 C CN100470054 C CN 100470054C CN B2006100798479 A CNB2006100798479 A CN B2006100798479A CN 200610079847 A CN200610079847 A CN 200610079847A CN 100470054 C CN100470054 C CN 100470054C
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Abstract
The oil-cold compressor comprises: an oil flow path included oil separation and recovery part, dual-way alternative temperature regulation valve, and gas-cold cooler with cooling fan or bypass path till the gas compress space; a discharge temperature detector, and a controller to control the cooling fan and regulation valve according to detector data. This invention can prevent water condensation in exhausted gas, and saves energy.
Description
Technical field
The present invention relates to a kind of oil-cooled type screw compressor that has the air-cooling type oil cooler.
Background technique
In the past, the oil-cooled type screw compressor that has an air-cooling type oil cooler by known (for example, with reference to the spy open flat 6-213186 communique, the spy opens the 2003-206864 communique).
Open in the flat 6-213186 communique the spy, following oil-cooled type screw compressor is disclosed: the oil temperature that detects air-cooling type oil cooler outlet port, based on this detected temperatures, control is used for the air quantity of cold oil cold type cooler, the oil temperature that maintenance enters compress body is a setting temperature, thus, suppress the condensation of the moisture (drain) in the oil.
Open in the 2003-206864 communique the spy, following oil-cooled type screw compressor is disclosed: based on detected discharge temperature, the drive portion of the cooling fan of control air-cooling type oil cooler is the rotating speed of motor, discharge temperature is maintained the oil temperature that is higher than the temperature of discharging condensate moisture in the gas, separating out.
Low more to the gas compression space to oil temperature, then the performance of oil-cooled type screw compressor is good more, but opposite, if should be low excessively to oil temperature, the discharge temperature of pressurized gas will descend too much, causes the condensate moisture in the gas, the problem generation of separating out.
In compressor, the condensation of moisture in the gas, separate out and occur in the discharge side that gas is in compressive state, open the spy under the situation of oil-cooled type screw compressor of flat 6-213186 communique record, even the oily temperature of air-cooling type oil cooler outlet side remains on setting temperature, and because the temperature of above-mentioned discharge side can not be controlled, so the condensation that still can not prevent moisture in this discharge side is arranged, the problem of separating out. and then, the condensation number of moisture is the function of gas pressure and temperature in the gas, pressure is high more, temperature is low more in addition, the then easy more condensation of moisture. therefore, if will only prevent condensate moisture by temperature control, need then to infer that head pressure under the highest state of gas pressure carries out temperature control, the result, can not reduce to oil temperature. promptly, it is very important that discharge temperature is maintained on the proper temperature, if only according to the oil supply temperature controlling, then give oil temperature＜discharge temperature, even to the low degree of oil temperature to the condensation that produces moisture, discharge temperature is also for more than the condensing temperature of discharging moisture in the gas, even and if under the suitable situation of discharge temperature, owing to will be set as the temperature that can prevent to discharge the condensation of moisture in the gas to oil temperature, so to oil temperature is higher temperature, can produce the problem that compressor performance reduces.
The spy opens the invention of 2003-206864 communique record, with the cooling fan motor rotary speed of air-cooling type oil cooler is that certain oil-cooled type screw compressor is compared, for fear of the condensation of discharging moisture in the gas, discharge temperature is carried out suitable control, can obtain effects such as energy-conservation, but, also wish further energy-conservation.
Summary of the invention
The present invention for solve above-mentioned in the past problem, satisfy the demand and make, a kind of condensation that can prevent to discharge moisture in the gas is provided, separates out, and oil-cooled type screw compressor that can be energy-conservation.
In order to solve above-mentioned problem, the 1st technological scheme is a kind of oil-cooled type screw compressor, comprising: compressor main body; Oil separates recover, will supply with the oil in the gas compression space in the described compressor main body from discharging gas separation and reclaiming; Temperature control valve (TCV) is to being regulated by the flow of two streams shunted; Cooling fan is by motor driven; The air-cooling type oil cooler cools off oil by the wind of sending from described cooling fan; The oil stream, lead to described gas compression space from the oily reservoir that described oil separates recover via described temperature control valve (TCV), described oily stream at described temperature control valve (TCV) between the described gas compression space, comprise stream through described air-cooling type oil cooler, and and the stream of the described air-cooling type oil cooler of this process is provided with concurrently and without the bypass flow path of described air-cooling type oil cooler; The discharge temperature detector detects the temperature of described discharge gas; And control gear, based on by the detected discharge temperature Td of described discharge temperature detector, control the described motor and the described temperature control valve (TCV) of described cooling fan, in described control gear, set best discharge temperature Tdo with the rotating speed of regulating described motor and the split ratio of described temperature control valve (TCV), described best discharge temperature Tdo is the amount of moisture Ws that gas contained that described compressor main body sucks, discharge temperature when becoming same value with the amount of moisture Wd that follows the gas of discharging with saturation state in described compressor main body, described control gear is regulated the split ratio of described temperature control valve (TCV) in the following manner: be higher than at described discharge temperature Td under the situation of described best discharge temperature Tdo, compare with other situations, increase the oil mass that flows to described gas compression space through described air-cooling type oil cooler; Be lower than at described discharge temperature Td under the situation of described best discharge temperature Tdo, compare, increase the oil mass that flows to described gas compression space through described bypass flow path with other situations.
The 2nd technological scheme is on the basis of the 1st technological scheme, described control gear is regulated the split ratio of described temperature control valve (TCV) in the following manner: be higher than at described discharge temperature Td under the situation of described best discharge temperature Tdo, make through described temperature control valve (TCV) and flow to the oil in described gas compression space all through described air-cooling type oil cooler, be lower than at described discharge temperature Td under the situation of described best discharge temperature Tdo, the difference of described discharge temperature Td and described best discharge temperature Tdo is big more, makes that to flow to the oil mass in described gas compression space through described bypass flow path many more.
The 3rd technological scheme is on the basis of the 2nd technological scheme, described control gear, if described discharge temperature Td is lower than the value Tdo+ Δ T that only exceeds set point of temperature Δ T than described best discharge temperature Tdo, then the rotating speed with described motor keeps certain; If described discharge temperature Td is higher than the value Tdo+ Δ T that only exceeds set point of temperature Δ T than described best discharge temperature Tdo, then regulate the rotating speed of described motor, make discharge temperature Td become the value Tdo+ Δ T that only exceeds set point of temperature Δ T than described best discharge temperature Tdo.
The 4th technological scheme is on the basis of the 3rd technological scheme, described control gear, if described discharge temperature Td is higher than the value Tdo+ Δ T that only exceeds set point of temperature Δ T than described best discharge temperature Tdo, then will carry out pid calculation as the desired value of discharge temperature Td, to regulate the rotating speed of described motor than the value Tdo+ Δ T that described best discharge temperature Tdo only exceeds set point of temperature Δ T.
The 5th technological scheme is on the basis of the 3rd technological scheme, and described set point of temperature Δ T is the constant of setting in order to prevent to produce jitter phenomenon in described control gear.
Description of drawings
Fig. 1 is the schematic representation that the integral body of expression oil-cooled type screw compressor of the present invention constitutes.
Fig. 2 be in the expression oil-cooled type screw compressor shown in Figure 1 discharge temperature with the relation that contains amount of moisture and the discharge temperature of discharging gas and take the figure of the relation of amount of moisture out of.
Fig. 3 is the graph of a relation that detects the valve port opening of discharge temperature Td and cooling fan motor rotary speed, temperature control valve (TCV).
Embodiment
Below, an embodiment of the invention are described with reference to the accompanying drawings..
Fig. 1 shows oil-cooled type screw compressor 1 of the present invention, and the compressor main body 11 of this oil-cooled type screw compressor 1, is connected suction passage 13 and discharges on the stream 14 as drive portion with motor 12.
And, separate in the oil separation element 21 and the space portion between the oily reservoir 22 of recover 19 at oil, be provided with discharge temperature detector 17 that detects the temperature of discharging gas and the head pressure detector 18 that detects the pressure of discharging gas, in Fig. 1, discharge temperature detector 17 and head pressure detector 18 are disposed at oil and separate the oil separation element 21 of recover 19 and the space portion between the oily reservoir 22, but, also can be configured on the part of above-mentioned space portion discharge stream 14 in addition.
Extend fuel-displaced stream 27 from oily reservoir 22, described oily stream 27 is through oil strainer 23, temperature control valve (TCV) 24 and air-cooling type oil cooler 25, perhaps through oil strainer 23, temperature control valve (TCV) 24 and bypass flow path 26, lead to the gas compression space in the compressor main body 11, oil supply positions such as bearing shaft envelope portion. in addition, temperature control valve (TCV) 24 has two direction-agile shunting functions. promptly, temperature control valve (TCV) 24 has following function: the oil mass that gas compression space in air-cooling type oil cooler 25 flows to compressor main body 11 etc. can be located, with flow to the fuel-flow control that above-mentioned gas compression volume etc. locates through bypass flow path 26 and become split ratio arbitrarily. in addition, air-cooling type oil cooler 25 has the cooling fan 29 that is driven by the other motor 28 that is independent of motor 12.
Inlet temperature detector 15, suck moisture detector 16, discharge temperature detector 17 and head pressure detector 18 link to each other with control gear 31, expression is by the detected inlet temperature of these detectors, suck humidity, the inlet temperature signal of discharge temperature and head pressure, suck moisture signal, discharge temperature signal and head pressure signal be imported into control gear 31. and then, control gear 31 links to each other with temperature control valve (TCV) 24 and motor 28, above-mentioned inlet temperature signal based on input, suck moisture signal, discharge temperature signal and head pressure signal, by control gear 31 control temperature control valve (TCV) 24 and motors 28, make the temperature that is injected into the oil in the above-mentioned gas compression volume reach suitable temperature. promptly, regulate the split ratio of temperature control valve (TCV) 24, the rotating speed of governor motor 28.
The method of operation of the oil-cooled type screw compressor 1 that said structure constitutes then, is described.
In the oil-cooled type screw compressor 1 that constitutes by said structure, be drawn into gas the compressor main body 11 from suction passage 13, accept the injection of oil and be compressed from oily stream 27 in the gas compression space, thereby boost, heat up, being accompanied by oil is discharged in the discharge stream 14, and be directed to oil separation recover 19. in this oil separation recover 19, pressurized gas separates with oil, pressurized gas is sent to the part of separating the extended discharge stream 14 in top of recover 19 from oil, oil then temporarily is stored in the oily reservoir 22. then, the oil of this oil reservoir 22 flows in the oily stream 27, through oil strainer 23, be diverted to air-cooling type oil cooler 25 sides and bypass flow path 26 sides by temperature control valve (TCV) 24, and be sent to the above-mentioned gas compression volume, return oil separation recover 19 from discharging stream 14 afterwards, circulate repeatedly.
Separate in the recover 19 at oil,, pressurized gas need be maintained under the following temperature, promptly, reliably moisture is remained on the temperature under the gaseous state, just make moisture become the temperature of water vapour in order to prevent condensate moisture from pressurized gas.
Suction gas at compressor main body 11 is under the situation of for example air, if establish inlet temperature be Ts (℃), suction humidity is Ds (%), then 1m
3Suction gas in contain amount of moisture Ws (kg/m
3) represent with following formula.
[formula 1]
Ws＝0.622×1.293×Hs÷760 (1)
Hs (=Ds ÷ 100 * Hs '): steam partial pressure (mmHg)
Hs ' (=10^{8.884-2224.4 ÷ (273+Ts) }): saturation vapor pressure (mmHg)
Annotate: " 10^X " is meant 10 X power (10
x).
Then, be that head pressure is Pd (kg/cm if establish compressed-air actuated pressure
2G), compressed-air actuated temperature be discharge temperature be Td (℃), then follow 1m
3Saturation state pressurized air flow out, take amount of moisture Wd (kg/m out of
3) represent with following formula.
[formula 2]
Wd＝0.622×1.293×Hd÷{760÷1.033×(1.033+Pd)} (2)
Hd (=100 ÷ 100 * Hd '=Hd '): steam partial pressure (mmHg)
Hd ' (=10^{8.884-2224.4 ÷ (273+Td) }): saturation vapor pressure (mmHg)
To sucking gas is that atmosphere, suction pressure Ps are that 760mmHg, inlet temperature Ts are 40 ℃, suck that humidity Ds is 75%, head pressure Pd is 7kg/cm
2Under the situation of G, discharge temperature Td (℃) and contain amount of moisture Ws (kg/m
3) relation, and discharge temperature Td (℃) with take amount of moisture Wd (kg/m out of
3) relation carry out computing, the result as shown in Figure 2, curve I is with to contain amount of moisture Ws corresponding among the figure, curve II is with to take amount of moisture Wd out of corresponding.
In the discharge stream 14 that comprises oil separation recover 19, in order to prevent separating out from the water of pressurized air condensation, make and contain amount of moisture Ws≤take amount of moisture Wd out of to get final product, according to Fig. 2 as can be seen, in discharge temperature is about more than 80 ℃ the time, be the state of this magnitude relationship, in discharging stream 14, can not separate out from compressed-air actuated condensed water.
In oil-cooled type screw compressor 1, in order not waste energy as much as possible and to suppress noise, wish to keep containing amount of moisture Ws≤take out of the relation of amount of moisture Wd, and reduce discharge temperature as much as possible. Given this, make and contain amount of moisture Ws=and take amount of moisture Wd out of, in control gear 31, based on respectively from inlet temperature detector 15, suck moisture detector 16 and head pressure detector 18 the represented inlet temperature Ts of signal to control gear 31 inputs, suck humidity Ds and head pressure Pd, calculating best discharge temperature Tdo. in addition, is atmosphere sucking gas, suction pressure Ps is 760mmHg, inlet temperature Ts is 40 ℃, sucking humidity Ds is 75%, head pressure Pd is 7kg/cm
2Under the situation of G, reach as Fig. 2 with reference to mentioned above, best discharge temperature Tdo is about 80 ℃.
Then, based on best discharge temperature Tdo with from discharge temperature detector 17 poor to the represented detected discharge temperature Td of the temperature signal of control gear 31 input, in the following manner, control the motor 28. of temperature control valve (TCV)s 24 and cooling fan 29 by control gear 31
At best discharge temperature Tdo+ Δ T〉detect under the situation of discharge temperature Td, the motor 28 of cooling fan 29 keeps " certain rotating speed ". simultaneously, Td is higher than under the situation of best discharge temperature Tdo in the detection discharge temperature, control temperature control valve (TCV) 24, make the oil mass that flows to air-cooling type oil cooler 25 sides compare increase with other situations. opposite, be lower than best discharge temperature Tdo if detect discharge temperature Td, then control temperature control valve (TCV) 24, make the oil mass that flows to bypass flow path 26 sides compare increase with other situations. in other words, for example, be higher than best discharge temperature Tdo if detect discharge temperature Td, then control temperature control valve (TCV) 24, if make that flowing to the oily of above-mentioned gas compression volume through temperature control valve (TCV) 24 all is lower than best discharge temperature Tdo through air-cooling type oil cooler 25. detection discharge temperature Td, then control temperature control valve (TCV) 24, the difference that detects discharge temperature Td and best discharge temperature Tdo is big more, makes that to flow to the oil mass of above-mentioned gas compression volume through bypass flow path 26 many more.
Above-mentioned Δ T is the constant that imports in order to prevent from the control gear 31 to produce shake (chattering) phenomenon, and for example under best discharge temperature Tdo was about 80 ℃ situation, Δ T was about 2 ℃.
Above-mentioned " certain rotating speed " is meant and can produces motor 28 air quantity, cooling fan 29 bigger among the air quantity Qa_min is used in the motor cooling with air quantity Qm_min and oil cooler cooling rotating speed, wherein, the cooling of described motor is meant with air quantity Qm_min: under a stable condition, the coil temperatures in the motor 12 are maintained motor required, the unit time below the maximum allowable temperature for motor 12 is carried out air cooling and cool off and use air quantity; The cooling of described oil cooler is meant with air quantity Qa_min: under a stable condition, will separate discharge gas that the discharge stream 14 of the second side of recover 19 supplies with from oil for air-cooling type oil cooler 25 is carried out air cooling and maintain oil cooler required, the unit time below the maximum allowable temperature and cool off and use air quantity.
More particularly, motor cooling is meant following situation with the above-mentioned stable condition of air quantity Qm_min: on the characteristic as the motor 12 of the drive portion of oil-cooled type screw compressor 1, rotating speed is the allowed minimum speed of motor 12, and the environment temperature of motor 12 is the allowed maximum temperatures of motor 12. in addition, oil cooler cooling is meant following situation with the above-mentioned stable condition of air quantity Qa_min: on the characteristic as the motor 12 of the drive portion of oil-cooled type screw compressor 1, rotating speed is the allowed minimum speed of motor 12, the environment temperature of motor 12 is the allowed maximum temperatures of motor 12, and, through temperature control valve (TCV) 24, all oil all are directed to air-cooling type oil cooler 25 sides.
On the other hand, under the situation of best discharge temperature Tdo+ Δ T≤detection discharge temperature Td, the rotating speed of the motor 28 of control cooling fan 29, make that detecting discharge temperature Td becomes best discharge temperature Tdo+ Δ T, and, control temperature control valve (TCV) 24 will be deposited the whole guiding of the oil air-cooling type oil cooler 25. of portion 22 from oil measure
In addition, in this case, the rotating speed of the motor 28 of cooling fan 29 is more than above-mentioned " certain rotating speed ". specifically, based on best discharge temperature Tdo with separate discharge temperature detector 17 detected discharge temperature Td poor of recover 19 by being arranged at oil, in control gear 31, carry out proportion integration differentiation (PID) computing, calculate the rotating speed of motor 28, based on this result of calculation, control motor 28.
For example, the pid calculation formula that is used to calculate the rotating speed of motor 28 is represented with following formula.
[formula 3]
Y＝Kp×(Td-Tdo)+{KI×(Td-Tdo)/TI+YI}+Kd×
{(Td-Tdo)-Yd} (3)
Y: the rotating speed of motor
Kp: proportional gain
KI: storage gain
Kd: DG Differential Gain
TI: intergration time
YI: integration composition last time
Yd: control deviation last time
But under the situation about using in actual operation, the desired value of discharge temperature Td is not best discharge temperature Tdo, but best discharge temperature Tdo+ Δ T, so replacement formula (3) is used for pid calculation with following formula.
[formula 4]
Y＝Kp×{Td-(Tdo+ΔT)}+〔KI×{Td-(Tdo+ΔT)}/TI+YI〕+Kd×〔{Td-(Tdo+ΔT)}〕 (4)
Like this, in oil-cooled type screw compressor 1, at best discharge temperature Tdo+ Δ T〉detect under the situation of discharge temperature Td, also can be under the MIN state of necessity with the power maintenance of cooling fan 29, keep discharge temperature suitable, avoid moisture condensation, separate out, can be energy-conservation and can suppress noise.
In addition, describing with reference to Fig. 3. this Fig. 3 detects the graph of a relation (line (A) and line (B)) of rotating speed of motor 28 of discharge temperature Td and cooling fan 29 and the graph of a relation (line (C) and line (D)) that detects discharge temperature Td and temperature control valve (TCV) 24 valve port opening that are communicated with to air-cooling type oil cooler 25 from oil strainer 23.
The left side longitudinal axis of Fig. 3 is represented from temperature control valve (TCV) 24 valve port opening of oil strainer 23 to 25 connections of air-cooling type oil cooler. be labeled as 100% position at this, represent that this valve port opening is for maximum, promptly flow to the oil in gas compression space of compressor main body 11 all through the state of air-cooling type oil cooler 25 through temperature control valve (TCV) 24. in other words, this Fig. 3 may also be referred to as the graph of a relation of the two direction split ratios that detect discharge temperature Td and temperature control valve (TCV) 24. in addition, the right side longitudinal axis of Fig. 3 is to regard maximum speed at as 100% o'clock, is the axle of rotating speed of the motor 28 of unit representation cooling fan 29 with percentage.
As indicated above, detecting discharge temperature Td is under the situation more than the best discharge temperature Tdo+ Δ T, the rotating speed of the motor 28 of control cooling fan 29, make detection discharge temperature Td become best discharge temperature Tdo+ Δ T. in addition, be appreciated that from the line (A) of Fig. 3, here, detecting discharge temperature Td is under the situation more than the best discharge temperature Tdo+ Δ T, the motor 28 of this cooling fan 29 increases and decreases to determine corresponding to detecting discharge temperature Td substantially pro rata. in addition, be appreciated that from the line (B) of Fig. 3, be lower than best discharge temperature Tdo+ Δ T if detect discharge temperature Td, then the rotating speed of motor 28 remained on predefined minimum speed promptly on " certain rotating speed ".
On the other hand, be higher than best discharge temperature Tdo if detect discharge temperature Td, be appreciated that from the line (C) of Fig. 3, is 100% from oil strainer 23 to the valve port opening of the temperature control valve (TCV) 24 of air-cooling type oil cooler 25 connections, become through temperature control valve (TCV) 24 and flow to the oil in gas compression space of compressor main body 11 all through the state of air-cooling type oil cooler 25. in addition, be appreciated that from the line (D) of Fig. 3, Td is lower than under the situation of best discharge temperature Tdo in the detection discharge temperature, the difference that detects discharge temperature Td and best discharge temperature Tdo is big more, the oil mass in gas compression space that flows to compressor main body 11 through bypass flow path 26 is big more. in other words, it is low more to detect discharge temperature Td, then with through the oil mass of air-cooling type oil cooler 25 compare, the oil mass in gas compression space that flows to compressor main body 11 through bypass flow path 26 is many more. in addition, in the moment of the detection discharge temperature Tmin of Fig. 3, the valve port opening of the temperature control valve (TCV) 24 that is communicated with to air-cooling type oil cooler 25 from oil strainer 23 becomes 0%, becomes through temperature control valve (TCV) 24 to flow to the oil in gas compression space of compressor main body 11 all through the state of bypass flow path 26.
In addition, in above-mentioned example, be based on the detection discharge temperature Td that detects by discharge temperature detector 17, carry out temperature control valve (TCV) 24, the control of the motor 28 of cooling fan 29, but, have at control gear 31 under the situation of aforementioned proportion integral differential operation function, also can carry out above-mentioned control based on the output Pa (transverse axis of Fig. 3 ()) of its pid calculation. in addition, under the bigger situation of the time constant of system, or under the less situation that gains, Δ T does not have width then controlled comparatively good, and short in time constant, under the big situation that gains, Δ T has width, and then stability is comparatively good.
In addition, in the present invention, must detect discharge temperature, thereby need discharge temperature detector 17, still, other inlet temperature detector 15, suck moisture detector 16,18 of head pressure detectors are optional.
For example, suction gas at oil-cooled type screw compressor 1 is atmosphere, when regarding the humidity of this atmosphere as maximum 100% and under the situation about turning round, do not need compressor main body 11 the suction side suction moisture detector 16. in addition, in this case, the maximum temperature of atmosphere is made as thinkable temperature, for example 40 ℃, as long as under the suction condition below 40 ℃, turn round, amount of moisture when then the amount of moisture in the atmosphere is less than these 40 ℃, can prevent the separating out of water of condensation in the pressurized air reliably, therefore, the inlet temperature detector 15 of suction side is also no longer necessary. and then, be under the situation of atmosphere such as sucking gas, if can regard suction pressure as certain, just can determine unique head pressure, thereby head pressure detector 18 is also no longer necessary according to the specification of compressor main body 11.
Claims (5)
1. an oil-cooled type screw compressor is characterized in that, comprising:
Compressor main body;
Oil separates recover, will supply with the oil in the gas compression space in the described compressor main body from discharging gas separation and reclaiming;
Temperature control valve (TCV) is to being regulated by the flow of two streams shunted;
Cooling fan is by motor driven;
The air-cooling type oil cooler cools off oil by the wind of sending from described cooling fan;
The oil stream, lead to described gas compression space from the oily reservoir that described oil separates recover via described temperature control valve (TCV), described oily stream at described temperature control valve (TCV) between the described gas compression space, comprise stream through described air-cooling type oil cooler, and and the stream of the described air-cooling type oil cooler of this process is provided with concurrently and without the bypass flow path of described air-cooling type oil cooler;
The discharge temperature detector detects the temperature of described discharge gas; And
Control gear based on by the detected discharge temperature of described discharge temperature detector (Td), is controlled the described motor and the described temperature control valve (TCV) of described cooling fan, with the rotating speed of regulating described motor and the split ratio of described temperature control valve (TCV),
In described control gear, set best discharge temperature (Tdo), described best discharge temperature (Tdo) be the amount of moisture that gas contained (Ws) that sucks of described compressor main body, with the discharge temperature of amount of moisture (Wd) when becoming same value of following the gas of discharging with saturation state in described compressor main body
Described control gear is regulated the split ratio of described temperature control valve (TCV) in the following manner:
Be higher than in described discharge temperature (Td) under the situation of described best discharge temperature (Tdo), compare, increase the oil mass that flows to described gas compression space through described air-cooling type oil cooler with other situations;
Be lower than in described discharge temperature (Td) under the situation of described best discharge temperature (Tdo), compare, increase the oil mass that flows to described gas compression space through described bypass flow path with other situations.
2. oil-cooled type screw compressor according to claim 1 is characterized in that,
Described control gear is regulated the split ratio of described temperature control valve (TCV) in the following manner:
Be higher than in described discharge temperature (Td) under the situation of described best discharge temperature (Tdo), make the oil that flows to described gas compression space through described temperature control valve (TCV) all through described air-cooling type oil cooler,
Be lower than in described discharge temperature (Td) under the situation of described best discharge temperature (Tdo), the difference of described discharge temperature (Td) and described best discharge temperature (Tdo) is big more, makes that to flow to the oil mass in described gas compression space through described bypass flow path many more.
3. oil-cooled type screw compressor according to claim 2 is characterized in that,
Described control gear,
If described discharge temperature (Td) is lower than the value (Tdo+ Δ T) that only exceeds set point of temperature (Δ T) than described best discharge temperature (Tdo), then the rotating speed with described motor keeps certain;
If described discharge temperature (Td) is higher than the value (Tdo+ Δ T) that only exceeds set point of temperature (Δ T) than described best discharge temperature (Tdo), then regulate the rotating speed of described motor, make discharge temperature (Td) become the value (Tdo+ Δ T) that only exceeds set point of temperature (Δ T) than described best discharge temperature (Tdo).
4. oil-cooled type screw compressor according to claim 3 is characterized in that,
Described control gear,
If described discharge temperature (Td) is higher than the value (Tdo+ Δ T) that only exceeds set point of temperature (Δ T) than described best discharge temperature (Tdo), then will carry out pid calculation as the desired value of discharge temperature (Td), to regulate the rotating speed of described motor than the value (Tdo+ Δ T) that described best discharge temperature (Tdo) only exceeds set point of temperature (Δ T).
5. oil-cooled type screw compressor according to claim 3 is characterized in that,
Described set point of temperature (Δ T) is the constant of setting in order to prevent to produce jitter phenomenon in described control gear.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005140022 | 2005-05-12 | ||
| JP2005140022A JP4546322B2 (en) | 2005-05-12 | 2005-05-12 | Oil-cooled compressor |
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|---|---|
| CN1862019A CN1862019A (en) | 2006-11-15 |
| CN100470054C true CN100470054C (en) | 2009-03-18 |
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| CNB2006100798479A Active CN100470054C (en) | 2005-05-12 | 2006-05-11 | Oil cooling compressor |
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| US9175687B2 (en) | 2011-11-17 | 2015-11-03 | Kobe Steel, Ltd. | Compression apparatus |
| CN110475973A (en) * | 2017-03-31 | 2019-11-19 | 株式会社日立产机系统 | Gas compressor |
| CN110475973B (en) * | 2017-03-31 | 2021-07-06 | 株式会社日立产机系统 | Gas compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1862019A (en) | 2006-11-15 |
| JP4546322B2 (en) | 2010-09-15 |
| JP2006316696A (en) | 2006-11-24 |
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