CN110822752A - Screw water cooler with novel capacity adjusting device and control method - Google Patents
Screw water cooler with novel capacity adjusting device and control method Download PDFInfo
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- CN110822752A CN110822752A CN201911027031.5A CN201911027031A CN110822752A CN 110822752 A CN110822752 A CN 110822752A CN 201911027031 A CN201911027031 A CN 201911027031A CN 110822752 A CN110822752 A CN 110822752A
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- connecting pipe
- screw
- baffle
- control method
- expansion valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention discloses a screw water cooler with a novel capacity adjusting device and a control method, wherein the novel capacity adjusting device of the screw water cooler comprises a screw compressor, a condenser and an evaporator, wherein the condenser and the evaporator are connected with the screw compressor; the air inlet of the screw compressor is provided with an air suction pressure sensor, one side of the air suction pressure sensor is provided with an air suction temperature sensor, the exhaust port of the screw compressor is provided with an exhaust pressure sensor, and one side of the exhaust pressure sensor is provided with an exhaust temperature sensor.
Description
Technical Field
The invention belongs to the technical field of screw units, and particularly relates to a screw water chiller with a novel capacity adjusting device and a control method.
Background
At present, screw water chilling units are more and more widely applied in the field of refrigeration and air conditioning in China, and in order to adapt to load change of an air conditioning system and keep the temperature of chilled water constant, the screw water chilling units complete the task through capacity adjustment. And controlling the loading and unloading of the screw compressor according to the change rate of the freezing inlet water temperature and the change rate of the freezing outlet water temperature and the difference between the change rate and the target value, so that the cold quantity of the unit is matched with the air conditioner load. The capacity of the conventional unit ranges from 25% to 100%, and when the unit is operated at the minimum capacity of 25% and the capacity still needs to be reduced, the compressor is controlled to stop. After the compressor is stopped, the water temperature rises quickly, so that the water temperature fluctuation is large.
The water temperature stability of the screw water chilling unit cooled in the technological process is particularly important for technological parameters and product quality, and in order to meet the temperature stability, the unit capacity control range requirement is expanded to 10% -100%. How to realize load range expansion and operation reliability is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a screw water cooler with a novel capacity adjusting device and a control method in order to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a screw water cooler with a novel capacity adjusting device and a control method thereof comprise a screw compressor, a condenser and an evaporator, wherein the condenser and the evaporator are connected with the screw compressor, an energy adjusting valve (1) is arranged on one side of the screw compressor, the inlet of the energy adjusting valve is positioned on a high-pressure gas pipeline of the screw compressor and the condenser, the outlet of the energy adjusting valve is positioned at the top of a shell of the evaporator, and an electronic expansion valve is arranged between the evaporator and the condenser; an air suction pressure sensor is arranged at an air inlet of the screw compressor, an air suction temperature sensor is arranged on one side of the air suction pressure sensor, an exhaust pressure sensor is arranged at an exhaust port of the screw compressor, and an exhaust temperature sensor is arranged on one side of the exhaust pressure sensor; when the unit operation capacity needs to be increased, whether an energy regulating valve is in a closed state or not is detected, and if the energy regulating valve is in the closed state, a screw compressor is loaded; if the energy regulating valve is in the opening state, the opening degree of the energy regulating valve is firstly reduced; if the unit operation capacity needs to be reduced, whether the screw compressor is at the minimum capacity is detected firstly: if the capacity of the electronic expansion valve is larger than the minimum capacity, unloading the screw compressor, controlling the opening degree of the electronic expansion valve by using an exhaust superheat degree (exhaust temperature-saturation temperature corresponding to exhaust pressure), increasing the opening degree of the electronic expansion valve when the exhaust superheat degree exceeds a maximum target value, decreasing the opening degree of the electronic expansion valve when the exhaust superheat degree is smaller than the minimum target value, opening the energy adjusting valve when the capacity of the electronic expansion valve is smaller than or equal to the minimum capacity, keeping the opening degree of the electronic expansion valve unchanged within 90s, then controlling the opening degree of the electronic expansion valve by using an intake superheat degree (intake temperature-saturation temperature corresponding to intake pressure), increasing the opening degree of the electronic expansion valve when the intake superheat degree exceeds the maximum target value, and decreasing the opening degree of the electronic expansion valve when the intake superheat degree is smaller than the minimum target value; under the mutual cooperation of the energy regulating valve and the electronic expansion valve, the reliability of the unit operation is ensured, the unit stably operates within a load range, and the stability of the unit temperature control is improved.
A water inlet temperature sensor is arranged at the water inlet of the evaporator, and a water outlet temperature sensor is arranged at the water outlet of the evaporator; the opening of the energy regulating valve is controlled by the variation rate of the freezing inlet water temperature Twi and the outlet water temperature Two and the difference between the target value and the variation rate, so as to ensure the constant freezing water temperature.
A liquid spraying expansion valve is arranged between the low-pressure air suction pipe of the screw compressor and the inlet of the electronic expansion valve; and in the running process, when the exhaust temperature or the motor temperature exceeds a protection value, the liquid injection expansion valve is opened to protect the normal running of the compressor.
The energy regulating valve comprises a shell, an installation block arranged on the shell, a baffle arranged in the shell and an adjusting motor arranged at the top of the installation block, wherein the adjusting motor is used for driving the baffle to move up and down; the position of the baffle is controlled by the adjusting motor, so that the opening of the adjusting valve is changed according to the actual situation, the refrigerating requirement of the unit is met, and the working stability of the unit is ensured.
A first connecting pipe is arranged in the shell, a second connecting pipe is arranged in the middle of the first connecting pipe, the first connecting pipe is connected with the second connecting pipe through a connecting ring, and the second connecting pipe and the connecting ring are both made of elastic materials; the first connecting pipe and the second connecting pipe are matched with each other, the inner wall of the processing shell is wrapped, and the coolant directly passes through the first connecting pipe and the second connecting pipe after entering the shell, so that the heat preservation effect on the coolant is achieved, and the temperature change of the coolant after passing through the shell is reduced; when the baffle down moved, the baffle contacted with the second connecting pipe, under the elastic material of second connecting pipe and go-between, made the second connecting pipe take place deformation under the baffle effect to change the aperture of second connecting pipe, thereby control the flow of regulating valve, make the governing valve do the aperture adjustment as required, guarantee the reliability of unit operation.
The mounting block is provided with a first chute, the bottom of the first chute is provided with a supporting spring, the top of the supporting spring is provided with a first supporting plate, the side wall of the second connecting pipe is provided with a first sliding block matched with the first chute, and the baffle is arranged above the second connecting pipe; when the unit works, the water inlet temperature and the water outlet temperature are fed back to the adjusting motor, the adjusting motor drives the baffle to move downwards, the baffle pushes the second connecting pipe to move downwards and simultaneously pushes the first sliding block to move towards the bottom of the first sliding groove until the first sliding block moves to the bottom of the first sliding groove to completely seal the adjusting valve; under the matching of the first connecting pipe and the second connecting pipe, the cooling liquid flows through the regulating valve more smoothly, so that the baffle is prevented from being damaged by overlarge impact force of the cooling liquid on the baffle; provide thrust for first slider under the supporting spring effect, first slider is automatic up-moving when making the baffle rise to make the second connecting pipe recover fast, guarantee the flow of governing valve, promote the control accuracy of governing valve.
A cavity is formed in the second connecting pipe, an arc-shaped elastic sheet is arranged in the cavity, a movable cavity is formed in the side wall of the cavity, a limiting spring is arranged in the movable cavity, and a push plate is arranged at one end of the limiting spring; under the action of the arc-shaped elastic sheet, stronger deformation capacity is provided for the second connecting pipe, so that the baffle of the second connecting pipe can be quickly restored after moving upwards; the movable cavity is a deformation reserved space of the arc-shaped elastic sheet, so that the arc-shaped elastic sheet is prevented from being abutted against the inner wall of the cavity; when the baffle up moved, spacing spring promoted the push pedal toward the motion of activity chamber outside, made the push pedal promote the arc shell fragment both ends toward the middle part motion, arc shell fragment middle part up hunch-up, under spacing spring and arc spring's the mutually supporting, made the comparatively quick completion of second connecting pipe action of resetting, increased the reliability that the governing valve used.
A first movable groove matched with the first sliding block is formed in the inner wall of the shell, and a fixed rod is arranged in the first movable groove; one end of the first connecting pipe is provided with a first connecting groove, one end of the shell is provided with a second connecting groove, a first connecting plate is arranged in the first connecting groove, one end of the first connecting plate is provided with a second connecting plate, and the second connecting plate is provided with a third connecting groove matched with the second connecting groove; when the first connecting pipe and the second connecting pipe are installed, the first connecting pipe and the second connecting pipe are inserted into the shell, the third connecting plate is inserted into the second connecting groove, the second connecting plate is rotated to enable the second connecting plate to drive the third connecting plate to rotate, the third connecting plate is fixed in the second connecting groove, the first connecting plate is in contact with the bottom surface of the first connecting groove, the first connecting pipe and the second connecting pipe are clamped between the two first connecting plates, and the first connecting pipe and the second connecting plate are fixed to complete installation of the first connecting pipe and the second connecting pipe; the first sliding block is fixed under the action of the fixed rod, so that the first sliding block is prevented from falling out of the first movable part, and the connecting effect of the second connecting pipe and the shell is improved; when maintaining the governing valve, follow the second spread groove internal rotation with the third connecting plate, take out the dead lever from first movable groove again to take out first connecting pipe and second connecting pipe from the casing, first slider takes out from first movable groove along first movable groove, reduces the maintenance degree of difficulty of governing valve.
The mounting block is provided with a mounting plate, the mounting plate is connected with the mounting block through a bolt, the mounting plate is provided with a through groove matched with the baffle, the mounting plate is provided with a transmission cavity, the top of the transmission cavity is provided with an equipment cavity, the adjusting motor is arranged in the equipment cavity, and an output shaft of the adjusting motor is provided with a transmission rod matched with the baffle; under the action of the transmission rod, the power of the adjusting motor is transmitted to the baffle plate so as to drive the baffle plate to move up and down, and the opening control of the adjusting valve is completed; when the regulating valve is in an opening state, the baffle is positioned in the through groove, and an accommodating space is provided for the baffle through the through groove, so that the regulating valve is in a completely opening state, and the use reliability of the regulating valve is ensured; under the setting of first connecting pipe and second connecting pipe, promote the sealed effect of governing valve, prevent that the coolant liquid from overflowing from the junction of mounting panel and installation piece, guarantee the stability of unit operation.
A second movable groove is formed in the mounting block, a second sliding groove is formed in the inner wall of the second movable groove, a movable plate is arranged in the second movable groove, a supporting block is arranged on the movable plate, and a third movable groove matched with the supporting block is formed in the baffle; when doing the maintenance to the regulating valve, driving motor control baffle enters into logical inslot, promote the fly leaf along second movable groove, make the supporting shoe enter into third movable groove, the supporting shoe is mutually supported with third movable groove, provide the holding power for the baffle under the supporting shoe effect, fix the baffle at logical inslot, drive adjustment motor rotates, make transfer line and baffle throw off and be connected, roll out the bolt afterwards, pull down the mounting panel from the installation piece, so that directly get the baffle from logical inslot, reduce the maintenance degree of difficulty to the regulation.
The invention has the following advantages: under the mutual cooperation of the energy regulating valve and the electronic expansion valve, the reliability of the unit operation is ensured, the unit stably operates within a load range, and the stability of the unit temperature control is improved.
Drawings
Fig. 1 is a schematic view of a novel capacity adjusting device system of a screw water chiller.
Fig. 2 is a schematic flow chart of the novel adjusting device of the screw water chiller of the present invention.
Fig. 3 is a schematic structural diagram of the energy regulating valve of the present invention.
FIG. 4 is a first schematic cross-sectional view of an energy regulating valve of the present invention.
Fig. 5 is an enlarged view of a portion a in fig. 4.
FIG. 6 is a schematic cross-sectional view of an energy regulating valve of the present invention.
Fig. 7 is an enlarged view of fig. 6 at B.
Fig. 8 is a third schematic sectional view of the energy regulating valve of the present invention.
Fig. 9 is an enlarged view of fig. 8 at C.
Fig. 10 is a cross-sectional view of a fourth embodiment of the energy regulating valve of the present invention.
Fig. 11 is an enlarged view of fig. 10 at D.
Detailed Description
As shown in fig. 1-11, a screw water chiller with a novel capacity adjusting device and a control method thereof include a screw compressor 10, a condenser 20 and an evaporator 30 connected to the screw compressor 10, wherein the condenser can be divided into air cooling, water cooling, evaporative cooling and the like according to different structural types and cooling media; an energy regulating valve 1 is arranged on one side of the screw compressor 10, and high-pressure gas discharged by the screw compressor enters the fluorine side in the evaporator shell when the energy regulating valve is opened; the inlet of the energy regulating valve is positioned on the high-pressure gas pipeline of the screw compressor 10 and the condenser 20, the outlet of the energy regulating valve is positioned at the top of the shell of the evaporator 30, and an electronic expansion valve 50 is arranged between the evaporator 30 and the condenser 20; an air inlet of the screw compressor 10 is provided with an air suction pressure sensor 101, one side of the air suction pressure sensor 101 is provided with an air suction temperature sensor 102, an air outlet of the screw compressor 10 is provided with an exhaust pressure sensor 103, and one side of the exhaust pressure sensor 103 is provided with an exhaust temperature sensor 104; when the unit operation capacity needs to be increased, whether the energy regulating valve is in a closed state or not is detected, and if the energy regulating valve is in the closed state, the screw compressor 10 is loaded; if the energy regulating valve is in the opening state, the opening degree of the energy regulating valve is firstly reduced; if the unit operation capacity needs to be reduced, it is first detected whether the screw compressor 10 is at the minimum capacity: if the capacity of the screw compressor is larger than the minimum capacity, unloading the screw compressor 10, controlling the opening degree of the electronic expansion valve by using an exhaust superheat degree (exhaust temperature-saturation temperature corresponding to exhaust pressure), increasing the opening degree of the electronic expansion valve 50 when the exhaust superheat degree exceeds a maximum target value, decreasing the opening degree of the electronic expansion valve 50 when the exhaust superheat degree is smaller than the minimum target value, opening an energy adjusting valve if the capacity of the screw compressor is smaller than or equal to the minimum capacity, keeping the opening degree of the electronic expansion valve 50 unchanged for 90s, then controlling the opening degree of the electronic expansion valve 50 by using a saturation temperature corresponding to an intake superheat degree intake temperature-intake pressure, increasing the opening degree of the electronic expansion valve 50 when the intake superheat degree exceeds the maximum target value, and decreasing the opening degree of the electronic expansion valve 50 when the intake superheat degree is smaller than the minimum target; under the mutual cooperation of the energy regulating valve and the electronic expansion valve, the reliability of the unit operation is ensured, the unit stably operates within a load range, and the stability of the unit temperature control is improved.
A water inlet temperature sensor 301 is arranged at a water inlet of the evaporator 30, and a water outlet temperature sensor 302 is arranged at a water outlet of the evaporator 30; the opening of the energy regulating valve 1 is controlled by the variation rate of the freezing inlet water temperature Twi and the outlet water temperature twoo and the difference from the target value, so as to ensure the constant freezing water temperature.
A liquid spraying expansion valve 40 is arranged between the screw compressor 10 and the electronic expansion valve 50, the inlet of the liquid spraying expansion valve is positioned on a high-pressure liquid pipe between the condenser and the electronic expansion valve, and the outlet of the liquid spraying expansion valve is positioned on a low-pressure air inlet pipeline of the compressor; and in the running process, when the exhaust temperature or the motor temperature exceeds a protection value, the liquid injection expansion valve is opened to protect the normal running of the compressor.
When the unit operation capacity needs to be kept, the capacity of the screw compressor and the opening degree of the energy regulating valve are kept unchanged, and the control mode of the electronic expansion valve is also kept unchanged, namely if the energy regulating valve is in an opening state, the opening degree is controlled by suction superheat degree; if the energy regulating valve is in a closed state, the opening degree is controlled by the superheat degree of the exhaust gas.
The low-temperature low-pressure gas refrigerant from the evaporator enters a compressor, is compressed into a high-temperature high-pressure gas refrigerant, then is increased in pressure and reduced in volume, and then enters a condenser to be condensed into high-pressure liquid. The high-pressure liquid refrigerant enters the electronic expansion valve, is throttled and depressurized into a low-temperature low-pressure gas-liquid two-phase mixture, then enters the evaporator, absorbs the heat of the chilled water with relatively high temperature, cools the chilled water, evaporates the chilled water into a low-temperature low-pressure gas refrigerant, and the gas refrigerant enters the compressor again to be recompressed, and the process is repeated.
The energy regulating valve comprises a shell 1, an installation block 11 arranged on the shell 1, a baffle 25 arranged in the shell 1 and an adjusting motor 23 arranged at the top of the installation block 11, wherein the adjusting motor 23 is used for driving the baffle 25 to move up and down; the position of the baffle is controlled by the adjusting motor, so that the opening of the adjusting valve is changed according to the actual situation, the refrigerating requirement of the unit is met, and the working stability of the unit is ensured.
A first connecting pipe 15 is arranged in the shell 1, a second connecting pipe 13 is arranged in the middle of the first connecting pipe 15, the first connecting pipe 15 is connected with the second connecting pipe 13 through a connecting ring 14, and the second connecting pipe 13 and the connecting ring 14 are both made of elastic materials; the second connecting pipe is made of rubber, and the connecting ring is made of silica gel; the first connecting pipe and the second connecting pipe are matched with each other, the inner wall of the processing shell is wrapped, and the coolant directly passes through the first connecting pipe and the second connecting pipe after entering the shell, so that the heat preservation effect on the coolant is achieved, and the temperature change of the coolant after passing through the shell is reduced; when the baffle down moved, the baffle contacted with the second connecting pipe, under the elastic material of second connecting pipe and go-between, made the second connecting pipe take place deformation under the baffle effect to change the aperture of second connecting pipe, thereby control the flow of regulating valve, make the governing valve do the aperture adjustment as required, guarantee the reliability of unit operation.
A first chute is arranged on the mounting block 11, a support spring 16 is arranged at the bottom of the first chute, a first support plate 161 is arranged at the top of the support spring 16, a first slide block 131 matched with the first chute is arranged on the side wall of the second connecting pipe 13, and the baffle 25 is arranged above the second connecting pipe 13; when the unit works, the water inlet temperature and the water outlet temperature are fed back to the adjusting motor, the adjusting motor drives the baffle to move downwards, the baffle pushes the second connecting pipe to move downwards and simultaneously pushes the first sliding block to move towards the bottom of the first sliding groove until the first sliding block moves to the bottom of the first sliding groove to completely seal the adjusting valve; under the matching of the first connecting pipe and the second connecting pipe, the cooling liquid flows through the regulating valve more smoothly, so that the baffle is prevented from being damaged by overlarge impact force of the cooling liquid on the baffle; provide thrust for first slider under the supporting spring effect, first slider is automatic up-moving when making the baffle rise to make the second connecting pipe recover fast, guarantee the flow of governing valve, promote the control accuracy of governing valve.
A cavity is formed in the second connecting pipe 13, an arc-shaped elastic sheet 132 is arranged in the cavity, a movable cavity is formed in the side wall of the cavity, a limiting spring 133 is arranged in the movable cavity, and a push plate 134 is arranged at one end of the limiting spring 133; under the action of the arc-shaped elastic sheet, stronger deformation capacity is provided for the second connecting pipe, so that the baffle of the second connecting pipe can be quickly restored after moving upwards; the movable cavity is a deformation reserved space of the arc-shaped elastic sheet, so that the arc-shaped elastic sheet is prevented from being abutted against the inner wall of the cavity; when the baffle up moved, spacing spring promoted the push pedal toward the motion of activity chamber outside, made the push pedal promote the arc shell fragment both ends toward the middle part motion, arc shell fragment middle part up hunch-up, under spacing spring and arc spring's the mutually supporting, made the comparatively quick completion of second connecting pipe action of resetting, increased the reliability that the governing valve used.
A first movable groove matched with the first sliding block 131 is formed in the inner wall of the shell 1, and a fixed rod is arranged in the first movable groove; a first connecting groove is formed in one end of the first connecting pipe 15, a second connecting groove is formed in one end of the shell 1, a first connecting plate 122 is arranged in the first connecting groove, a second connecting plate 12 is arranged at one end of the first connecting plate 122, and a third connecting groove 121 matched with the second connecting groove is formed in the second connecting plate 12; the third connecting plate is connected with the second connecting groove through threads; when the first connecting pipe and the second connecting pipe are installed, the first connecting pipe and the second connecting pipe are inserted into the shell, the third connecting plate is inserted into the second connecting groove, the second connecting plate is rotated to enable the second connecting plate to drive the third connecting plate to rotate, the third connecting plate is fixed in the second connecting groove, the first connecting plate is in contact with the bottom surface of the first connecting groove, the first connecting pipe and the second connecting pipe are clamped between the two first connecting plates, and the first connecting pipe and the second connecting plate are fixed to complete installation of the first connecting pipe and the second connecting pipe; the first sliding block is fixed under the action of the fixed rod, so that the first sliding block is prevented from falling out of the first movable part, and the connecting effect of the second connecting pipe and the shell is improved; when maintaining the governing valve, follow the second spread groove internal rotation with the third connecting plate, take out the dead lever from first movable groove again to take out first connecting pipe and second connecting pipe from the casing, first slider takes out from first movable groove along first movable groove, reduces the maintenance degree of difficulty of governing valve.
The side wall of the first connecting plate is provided with a first convex rib, the inner wall of the first connecting groove is provided with a second convex rib, and the first connecting plate is fixed in the first connecting groove under the mutual matching of the first convex rib and the second convex rib so as to fix the first connecting pipe under the action of the first connecting plate; after the third connecting plate is rotated out from the second connecting groove, the second connecting plate is pulled outwards, the first connecting plate is pulled out from the first connecting groove, the first connecting plate is separated from the first connecting groove to be in contact, the second connecting plate is prevented from blocking the first connecting pipe due to disassembly and assembly, the first connecting pipe and the second connecting pipe can be conveniently taken out from the shell, and the maintenance cost of the regulating valve is reduced.
The mounting block 11 is provided with a mounting plate 2, the mounting plate 2 is connected with the mounting block 11 through a bolt, the mounting plate 2 is provided with a through groove matched with the baffle 25, the mounting plate 2 is provided with a transmission cavity 21, the top of the transmission cavity 21 is provided with an equipment cavity 22, the adjusting motor 23 is arranged in the equipment cavity 22, and an output shaft of the adjusting motor 23 is provided with a transmission rod 24 matched with the baffle 25; under the action of the transmission rod, the power of the adjusting motor is transmitted to the baffle plate so as to drive the baffle plate to move up and down, and the opening control of the adjusting valve is completed; when the regulating valve is in an opening state, the baffle is positioned in the through groove, and an accommodating space is provided for the baffle through the through groove, so that the regulating valve is in a completely opening state, and the use reliability of the regulating valve is ensured; under the setting of first connecting pipe and second connecting pipe, promote the sealed effect of governing valve, prevent that the coolant liquid from overflowing from the junction of mounting panel and installation piece, guarantee the stability of unit operation.
The adjusting motor is provided with a transmission gear on an output shaft, a transmission groove is arranged on the transmission rod, the output shaft of the adjusting motor penetrates through the transmission groove, and the power of the adjusting motor is transmitted to the transmission rod under the action of the transmission gear; the top of the baffle is provided with a third connecting groove, the mounting plate is provided with a through hole matched with the transmission rod, and the transmission rod is connected into the third connecting groove through threads; the transmission cavity is provided with a first thread on the inner wall, the side wall of the transmission rod is provided with a second thread matched with the first thread, the first thread is only arranged at the bottom inside the transmission cavity, and the transmission rod can move up and down under the action of the adjusting motor under the mutual matching of the first thread and the second thread.
A second movable groove is formed in the mounting block 11, a second sliding groove is formed in the inner wall of the second movable groove, a movable plate 26 is arranged in the second movable groove, a second sliding block matched with the second sliding groove is arranged on the side wall of the movable plate, a supporting block 262 is arranged on the movable plate 26, a third movable groove matched with the supporting block 262 is formed in the baffle 25, and a pushing block 261 is arranged on the movable plate and is used for pushing the movable plate to move in the second movable groove under the action of the pushing block; when doing the maintenance to the regulating valve, driving motor control baffle enters into logical inslot, promote the fly leaf along second movable groove, make the supporting shoe enter into third movable groove, the supporting shoe is mutually supported with third movable groove, provide the holding power for the baffle under the supporting shoe effect, fix the baffle at logical inslot, drive adjustment motor rotates, make transfer line and baffle throw off and be connected, roll out the bolt afterwards, pull down the mounting panel from the installation piece, so that directly get the baffle from logical inslot, reduce the maintenance degree of difficulty to the regulation.
A connecting spring 252 is arranged at the top of the third movable groove, a second supporting plate 251 is arranged at the bottom of the connecting spring, when the adjusting valve is maintained, the adjusting motor drives the baffle plate to move upwards, so that the baffle plate moves to the top of the through groove, the movable plate is pushed along the second movable groove, the supporting block enters the third movable groove to be in contact with the second supporting plate, and the baffle plate is fixed in the through groove under the mutual matching of the second supporting plate and the supporting block; the adjustment motor continues to drive the transmission rod to rotate, so that the transmission rod rotates out of the third connecting groove, the connecting spring is matched with the second supporting plate, a reserved space is provided for the movement of the baffle, the transmission rod is enabled to be smoothly separated from the third connecting groove, then the bolt rotates out, the baffle and the adjustment motor can be conveniently maintained, and the maintenance difficulty of the adjustment valve is reduced.
Claims (10)
1. The utility model provides a take novel screw rod cold water machine and control method who adjusts device that holds, includes screw compressor (10), with condenser (20) and evaporimeter (30) that screw compressor (10) link to each other, its characterized in that: an energy regulating valve (1) is arranged on one side of the screw compressor (10), the inlet of the energy regulating valve (1) is positioned on a high-pressure gas pipeline of the screw compressor (10) and the condenser (20), the outlet of the energy regulating valve (1) is positioned at the top of a shell of the evaporator (30), and an electronic expansion valve (50) is arranged between the evaporator (30) and the condenser (20); an air inlet of the screw compressor (10) is provided with an air suction pressure sensor (101), one side of the air suction pressure sensor (101) is provided with an air suction temperature sensor (102), an air outlet of the screw compressor (10) is provided with an exhaust pressure sensor (103), and one side of the exhaust pressure sensor (103) is provided with an exhaust temperature sensor (104); when the running capacity of the unit needs to be increased, whether the energy regulating valve (1) is in a closed state or not is detected, and if the energy regulating valve is in the closed state, the screw compressor (10) is loaded; if the energy regulating valve is in an open state, the opening degree of the energy regulating valve (1) is firstly reduced; if the unit operation capacity needs to be reduced, whether the screw compressor (10) is at the minimum capacity is detected: if the capacity is larger than the minimum capacity, the screw compressor (10) is unloaded, the opening degree of the electronic expansion valve is controlled by the exhaust superheat degree (exhaust temperature-saturation temperature corresponding to exhaust pressure), the opening degree of the electronic expansion valve (50) is increased when the exhaust superheat degree exceeds the maximum target value, the opening degree of the electronic expansion valve (50) is decreased when the exhaust superheat degree is smaller than the minimum target value, if the capacity is smaller than or equal to the minimum capacity, the energy regulating valve (1) is opened, the opening degree of the electronic expansion valve (50) is kept unchanged within 90s, then the opening degree of the electronic expansion valve (50) is controlled by the suction superheat degree (the saturation temperature corresponding to the suction temperature and the suction pressure), the opening degree of the electronic expansion valve (50) is increased when the suction superheat degree exceeds the maximum target value, and the opening degree of the electronic expansion valve (50) is decreased when the suction superheat degree is less than the minimum target value.
2. The screw water chiller with the novel adjusting device and the control method thereof according to claim 1 are characterized in that: the water inlet of the evaporator (30) is provided with a water inlet temperature sensor (301), and the water outlet of the evaporator (30) is provided with a water outlet temperature sensor (302).
3. The screw water chiller with the novel adjusting device and the control method thereof according to claim 1 are characterized in that: and a liquid spraying expansion valve (40) is arranged between a low-pressure air inlet pipe of the screw compressor (10) and an inlet of the electronic expansion valve (50).
4. The screw water chiller with the novel adjusting device and the control method thereof according to claim 1 are characterized in that: energy adjusting valve (1) includes casing (1), locates installation piece (11) on casing (1), locate baffle (25) in casing (1) and locate adjustment motor (23) at installation piece (11) top, adjustment motor (23) are used for the drive baffle (25) are the up-and-down motion.
5. The screw water chiller with the novel adjusting device and the control method thereof as claimed in claim 4 are characterized in that: the shell is characterized in that a first connecting pipe (15) is arranged in the shell (1), a second connecting pipe (13) is arranged in the middle of the first connecting pipe (15), the first connecting pipe (15) is connected with the second connecting pipe (13) through a connecting ring (14), and the second connecting pipe (13) and the connecting ring (14) are made of elastic materials.
6. The screw water chiller with the novel accommodating and adjusting device and the control method thereof as claimed in claim 5 are characterized in that: be equipped with first spout on installation piece (11), first spout bottom is equipped with supporting spring (16), supporting spring (16) top is equipped with first backup pad (161), be equipped with on second connecting pipe (13) lateral wall with first spout matched with first slider (131), baffle (25) are located second connecting pipe (13) top.
7. The screw water chiller with the novel accommodating and adjusting device and the control method thereof as claimed in claim 5 are characterized in that: the second connecting pipe (13) is provided with a cavity, an arc-shaped elastic sheet (132) is arranged in the cavity, a movable cavity is arranged on the side wall of the cavity, a limiting spring (133) is arranged in the movable cavity, and one end of the limiting spring (133) is provided with a push plate (134).
8. The screw water chiller with the novel accommodating and adjusting device and the control method thereof as claimed in claim 6 are characterized in that: a first movable groove matched with the first sliding block (131) is formed in the inner wall of the shell (1), and a fixed rod is arranged in the first movable groove; first connecting pipe (15) one end is equipped with first spread groove, casing (1) one end is equipped with the second spread groove, be equipped with first connecting plate (122) in the first spread groove, first connecting plate (122) one end is equipped with second connecting plate (12), be equipped with on second connecting plate (12) with second spread groove matched with third spread groove (121).
9. The screw water chiller with the novel adjusting device and the control method thereof as claimed in claim 4 are characterized in that: be equipped with mounting panel (2) on installation piece (11), mounting panel (2) pass through the bolt with installation piece (11) link to each other, be equipped with on mounting panel (2) with baffle (25) matched with lead to groove, be equipped with transmission chamber (21) on mounting panel (2), transmission chamber (21) top is equipped with equipment chamber (22), adjustment motor (23) are located in equipment chamber (22), be equipped with on adjustment motor (23) output shaft with baffle (25) matched with transfer line (24).
10. The screw water chiller with the novel accommodating and adjusting device and the control method thereof as claimed in claim 9 are characterized in that: the mounting block (11) is provided with a second movable groove, the inner wall of the second movable groove is provided with a second sliding groove, a movable plate (26) is arranged in the second movable groove, the movable plate (26) is provided with a supporting block (262), and the baffle (25) is provided with a third movable groove matched with the supporting block (262).
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| CN201911027031.5A CN110822752B (en) | 2019-10-26 | 2019-10-26 | Screw water cooler with capacity adjusting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911027031.5A CN110822752B (en) | 2019-10-26 | 2019-10-26 | Screw water cooler with capacity adjusting device |
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|---|---|
| CN110822752B (en) | 2020-08-14 |
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