CN105387644A - Water chilling unit and control method thereof - Google Patents
Water chilling unit and control method thereof Download PDFInfo
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- CN105387644A CN105387644A CN201510873321.7A CN201510873321A CN105387644A CN 105387644 A CN105387644 A CN 105387644A CN 201510873321 A CN201510873321 A CN 201510873321A CN 105387644 A CN105387644 A CN 105387644A
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- throttling
- water chilling
- valve
- chilling units
- handpiece water
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Classifications
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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
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a water chilling unit and a control method thereof. The water chilling unit comprises a multi-stage compressor, a condenser, a first-stage throttling device, an economizer, a second-stage throttling device and an evaporator, wherein the multi-stage compressor, the condenser, the first-stage throttling device, the economizer, the second-stage throttling device and the evaporator are sequentially connected in an end-to-end mode and form refrigerant circulation. The first-stage throttling device comprises a first throttling channel and a second throttling channel, wherein the first throttling channel and the second throttling channel are connected in parallel. A first throttling element is arranged on the first throttling channel. A second throttling element and a first on-off valve are arranged on the second throttling channel. The second-stage throttling device comprise a third throttling channel and a fourth throttling channel, wherein the third throttling channel and the fourth throttling channel are connected in parallel. A third throttling element is arranged on the third throttling channel. A fourth throttling element and a second on-off valve are arranged on the fourth throttling channel. According to the water chilling unit, the second throttling channel and the fourth throttling channel can be opened selectively according to switching between an air-conditioning working condition and an ice-storage working condition of the water chilling unit, so that the throttling requirements of different modes of the water chilling unit are met, and accordingly stable and efficient operation of the water chilling unit is achieved.
Description
Technical field
The present invention relates to technical field of refrigeration equipment, especially relate to a kind of handpiece Water Chilling Units and control method thereof.
Background technology
Conventional centrifugal handpiece Water Chilling Units is only run under air conditioning condition, and general employing fixes orifice plate as throttling arrangement, and because condition range variation is less, fixing orifice plate can meet throttling requirement during unit refrigeration substantially.Double-working-condition centrifugal refrigerating machines needs at air-conditioning and ice making operating mode all energy Effec-tive Function, condition range variation is larger, single employing fixed restriction orifice plate can cause the not enough or high-low pressure of feed flow to collaborate phenomenon, unit can not stable and high effective operation, can not meet the throttling requirement of unit when two operating modes simultaneously.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the present invention proposes a kind of handpiece Water Chilling Units, and it is simple that described handpiece Water Chilling Units has structure, the advantage that cost is low.
The present invention also proposes a kind of control method of handpiece Water Chilling Units, and described control method is used for above-mentioned handpiece Water Chilling Units.
The handpiece Water Chilling Units of embodiment according to a first aspect of the present invention, comprising: compound compressor, condenser, a nuclear one-stage throttling device, economizer, two-step throttle device, evaporimeter join end to end to form refrigerant circulation successively; Described compound compressor comprises exhaust outlet, one-level air entry and inter-stage gas supplementing opening, and described condenser is connected with described exhaust outlet, and described evaporimeter is connected with described one-level air entry; Described economizer comprises import, liquid outlet and gas discharge outlet, and described two-step throttle device is communicated with described liquid outlet, and described gas discharge outlet is communicated with described inter-stage gas supplementing opening; A described nuclear one-stage throttling device comprises first throttle passage parallel with one another and second section circulation road, described first throttle passage is provided with first throttle element, described second section circulation road is provided with second section fluid element, described second section circulation road is also provided with the first on-off valve with optionally conducting or block described second section circulation road; Described two-step throttle device comprises the 3rd throttling passage parallel with one another and the 4th throttling passage, described 3rd throttling passage is provided with the 3rd restricting element, described 4th throttling passage is provided with the 4th restricting element, described 4th throttling passage is also provided with the second on-off valve with optionally conducting or block described 4th throttling passage.
According to the handpiece Water Chilling Units of the embodiment of the present invention, by being provided with the second section circulation road in parallel with first throttle passage in a nuclear one-stage throttling device, and the first on-off valve is set on second section circulation road, and in two-step throttle device, be provided with four throttling passage in parallel with the 3rd throttling passage, and the second on-off valve is set on the 4th throttling passage, can according to the switching of handpiece Water Chilling Units between air conditioning condition and Xu Yuanzhong, optionally conducting second section circulation road and the 4th throttling passage, thus meet the throttling requirement of handpiece Water Chilling Units different mode, and then realize the operation of handpiece Water Chilling Units stability and high efficiency.
According to some embodiments of the present invention, level sensing element is provided with in described evaporimeter, chromaffin body circulation road is also comprised in a described nuclear one-stage throttling device, described chromaffin body circulation road is in parallel with described first throttle passage and described second section circulation road, described chromaffin body circulation road is provided with electric expansion valve, and described electric expansion valve is electrically connected the aperture to control described electric expansion valve according to the detected value of described level sensing element with described level sensing element.
According to some embodiments of the present invention, level sensing element is provided with in described evaporimeter, chromaffin body circulation road is also comprised in described two-step throttle device, described chromaffin body circulation road is in parallel with described 3rd throttling passage and described 4th throttling passage, described chromaffin body circulation road is provided with electric expansion valve, and described electric expansion valve is electrically connected the aperture to control described electric expansion valve according to the detected value of described level sensing element with described level sensing element.
According to some embodiments of the present invention, be provided with main air supply passage parallel with one another and secondary air supply passage between the gas discharge outlet of described economizer and the inter-stage gas supplementing opening of described compressor, described secondary air supply passage is provided with tonifying Qi on-off valve with optionally conducting or block described secondary air supply passage.
According to some embodiments of the present invention, be connected with by-pass line between described condenser and described evaporimeter, described by-pass line is provided with by-passing valve with optionally conducting or block described by-pass line.
According to some embodiments of the present invention, described compound compressor comprises compression unit and drive motors, be provided with cooling liquid inlet and cooling liquid outlet in described drive motors, described cooling liquid inlet is communicated with described condenser, and described cooling liquid outlet is communicated with described evaporimeter.
Alternatively, be provided with primary input pipeline parallel with one another and secondary input channel between described condenser and described cooling liquid inlet, described secondary input channel is provided with cooling on-off valve with optionally conducting or block described secondary input channel.
In some embodiments of the invention, at least one in described first throttle element, described second section fluid element, described 3rd restricting element and described 4th restricting element is restricting orifice.
The control method of the handpiece Water Chilling Units of embodiment according to a second aspect of the present invention, described handpiece Water Chilling Units has air conditioning condition and Xu Yuanzhong, described method comprises the steps: when described handpiece Water Chilling Units is run under described air conditioning condition, control described first on-off valve to open with second section circulation road described in conducting, and control described second on-off valve and open with the 4th throttling passage described in conducting; When described handpiece Water Chilling Units is run under described Xu Yuanzhong, control described first on-off valve and close to block described second section circulation road, and control described second on-off valve closedown to block described 4th throttling passage.
According to the control method of the handpiece Water Chilling Units of the embodiment of the present invention, by controlling the first on-off valve on second section circulation road and the second on-off valve on the 4th throttling passage, the throttling demand of handpiece Water Chilling Units under air conditioning condition and Xu Yuanzhong can be met, ensure the operation of handpiece Water Chilling Units stability and high efficiency.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the schematic diagram of the handpiece Water Chilling Units according to the embodiment of the present invention.
Reference numeral:
Handpiece Water Chilling Units 100,
Compound compressor 1, compression unit 11, exhaust outlet 111, one-level air entry 112, inter-stage gas supplementing opening 113,
Drive motors 12, cooling liquid inlet 121, cooling liquid outlet 122,
One nuclear one-stage throttling device 2, first throttle passage 21, first throttle element 211,
Second section circulation road 22, second section fluid element 221, first on-off valve 222,
Chromaffin body circulation road 23, electric expansion valve 231,
Two-step throttle device the 3, three throttling passage the 31, three restricting element 311,
4th throttling passage the 32, four restricting element 321, second on-off valve 322,
Economizer 4, import 41, liquid outlet 42, gas discharge outlet 43,
Main air supply passage 51, secondary air supply passage 52, tonifying Qi on-off valve 521,
Primary input pipeline 61, secondary input channel 62, cooling on-off valve 621,
By-pass line 7, by-passing valve 71,
Evaporimeter 8, level sensing element 81, condenser 9.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " on ", D score, "front", "rear", "left", "right", " top ", " end ", " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
Describe the handpiece Water Chilling Units 100 of embodiment according to a first aspect of the present invention below with reference to Fig. 1, shown handpiece Water Chilling Units 100 can be run under air conditioning condition and Xu Yuanzhong two kinds of patterns.
As shown in Figure 1, the handpiece Water Chilling Units 100 of embodiment comprises compound compressor 1, condenser 9, nuclear one-stage throttling device 2, economizer 4, two-step throttle device 3 and evaporimeter 8 according to a first aspect of the present invention.
Specifically, compound compressor 1, condenser 9, nuclear one-stage throttling device 2, economizer 4, two-step throttle device 3 and evaporimeter 8 join end to end to form refrigerant circulation successively.Wherein, compound compressor 1 comprises exhaust outlet 111, one-level air entry 112 and inter-stage gas supplementing opening 113, and condenser 9 is connected with exhaust outlet 111, and evaporimeter 8 is connected with one-level air entry 112.Economizer 4 comprises import 41, liquid outlet 42 and gas discharge outlet 43, nuclear one-stage throttling device 2 and is connected with import 41, and two-step throttle device 3 is communicated with liquid outlet 42, and gas discharge outlet 43 is communicated with inter-stage gas supplementing opening 113.
It should be noted that, in correlation technique, when handpiece Water Chilling Units is run under air conditioning condition, the Suck and exhaust pressure ratio of compound compressor is little, mass flow is larger, when handpiece Water Chilling Units is run under Xu Yuanzhong, the Suck and exhaust pressure ratio of compound compressor is large, mass flow is less, if handpiece Water Chilling Units needs all can run efficiently under air conditioning condition and Xu Yuanzhong two kinds of operating modes, adopt single throttling passage that the not enough or high-low pressure of feed flow can be caused to collaborate phenomenon, the throttling demand of handpiece Water Chilling Units under two kinds of operating modes can not be met simultaneously, thus cause handpiece Water Chilling Units can not the operation of stability and high efficiency.
Therefore, in an embodiment of the present invention, one nuclear one-stage throttling device 2 comprises first throttle passage 21 parallel with one another and second section circulation road 22, first throttle passage 21 is provided with first throttle element 211, second section circulation road 22 is provided with second section fluid element 221, second section circulation road 22 is also provided with the first on-off valve 222 with optionally conducting or block second section circulation road 22.Thus, when handpiece Water Chilling Units 100 is run under air conditioning condition, the first on-off valve 222 can be opened to make second section circulation road 22 conducting, thus increase the throttle efficiency of refrigerant; When handpiece Water Chilling Units 100 is run under Xu Yuanzhong, first on-off valve 222 can be closed to block second section circulation road 22, only have first throttle passage 21 conducting can meet throttling requirement, thus the throttling requirement of handpiece Water Chilling Units 100 under air conditioning condition and Xu Yuanzhong can be better met by opening or closing of the first on-off valve 222, and this kind of control mode structure is simple, cost is low.
Two-step throttle device 3 comprises the 3rd throttling passage 31 parallel with one another and the 4th throttling passage 32,3rd throttling passage 31 is provided with the 3rd restricting element 311,4th throttling passage 32 is provided with and the 4th restricting element the 321, four throttling passage 32 is also provided with the second on-off valve 322 with optionally conducting or block the 4th throttling passage 32.Thus when handpiece Water Chilling Units 100 is run under air conditioning condition, the second on-off valve 322 can be opened make the 4th throttling passage 32 conducting, thus increase the throttle efficiency of refrigerant; When handpiece Water Chilling Units 100 is run under Xu Yuanzhong, second on-off valve 322 can be closed to block the 4th throttling passage 32, only have the 3rd throttling passage 31 conducting can meet throttling requirement, thus the throttling requirement of handpiece Water Chilling Units 100 under air conditioning condition and Xu Yuanzhong can be met further by opening or closing of the second on-off valve 322.
According to the handpiece Water Chilling Units 100 of the embodiment of the present invention, by being provided with the second section circulation road 22 in parallel with first throttle passage 21 in a nuclear one-stage throttling device 2, and the first on-off valve 222 is set on second section circulation road 22, and in two-step throttle device 3, be provided with four throttling passage 32 in parallel with the 3rd throttling passage 31, and the second on-off valve 322 is set on the 4th throttling passage 32, can according to the switching of handpiece Water Chilling Units 100 between air conditioning condition and Xu Yuanzhong, optionally conducting second section circulation road 22 and the 4th throttling passage 32, thus meet the throttling requirement of handpiece Water Chilling Units 100 different mode, and then realize the operation of handpiece Water Chilling Units 100 stability and high efficiency.
In preferred embodiments more of the present invention, with reference to Fig. 1, level sensing element 81 can be provided with in evaporimeter 8, chromaffin body circulation road 23 can also be comprised in one nuclear one-stage throttling device 2, chromaffin body circulation road 23 is in parallel with first throttle passage 21 and second section circulation road 22, chromaffin body circulation road 23 is provided with electric expansion valve 231, and electric expansion valve 231 is electrically connected the aperture to control electric expansion valve 231 according to the detected value of level sensing element 81 with level sensing element 81.Thus, the aperture that level sensing element 81 controls electric expansion valve 231 can control the restriction effect of the chromaffin body circulation road 23 in a nuclear one-stage throttling device 2, thus chromaffin body circulation road 23 can assist participation flow restriction control, improve the throttle efficiency of a nuclear one-stage throttling device 2, ensure that each tank fill level of handpiece Water Chilling Units 100 is in relatively accurately, rational position, thus ensure the operation of handpiece Water Chilling Units 100 efficient stable.
In addition, be understandable that, in chromaffin body circulation road 23, the control of the aperture of electric expansion valve 231 is not subject to the impact of the flow of first throttle passage 21 and second section circulation road 22.The aperture of electric expansion valve 231 controls only by the impact of the detected value of the level sensing element 81 be provided with in evaporimeter 8, that is, no matter the operating mode of handpiece Water Chilling Units 100, electric expansion valve 231 can be utilized to control the flow of the cold-producing medium of chromaffin body circulation road 23, thus the throttle efficiency of adjustment throttling arrangement.
Certainly, the present invention is not limited thereto, such as, chromaffin body circulation road can also be located in two-step throttle device 3 (scheming not shown), chromaffin body circulation road is in parallel with the 3rd throttling passage 31 and the 4th throttling passage 32, chromaffin body circulation road can be provided with electric expansion valve, be provided with level sensing element 81 in evaporimeter 8, electric expansion valve is electrically connected the aperture to control electric expansion valve according to the detected value of level sensing element 81 with level sensing element 81.Thus, the aperture that level sensing element 81 controls electric expansion valve can control the restriction effect of the chromaffin body circulation road in two-step throttle device 3, thus chromaffin body circulation road can assist participation flow restriction control, improve the throttle efficiency of two-step throttle device 3, ensure that each tank fill level of handpiece Water Chilling Units 100 is in relatively accurately, rational position, thus ensure the operation of handpiece Water Chilling Units 100 efficient stable.
In some embodiments of the invention, with reference to Fig. 1, be provided with main air supply passage 51 parallel with one another and secondary air supply passage 52 between the gas discharge outlet 43 of economizer 4 and the inter-stage gas supplementing opening 113 of compressor, secondary air supply passage 52 is provided with tonifying Qi on-off valve 521 with optionally conducting or block secondary air supply passage 52.Due to handpiece Water Chilling Units 100 run under air conditioning condition and Xu Yuanzhong respectively time, inter-stage air compensation differs greatly, in order to prevent absorbing gas belt liquid or suction superheat too high, can control respectively the inter-stage tonifying Qi of handpiece Water Chilling Units 100 in air conditioning condition and Xu Yuanzhong.Thus, when handpiece Water Chilling Units 100 is run under air conditioning condition, the required flow of air supply of handpiece Water Chilling Units 100 is large, tonifying Qi on-off valve 521 on secondary air supply passage 52 can be opened to realize main air supply passage 51 and secondary air supply passage 52 to open and to compound compressor 1 tonifying Qi simultaneously, thus realize the operation of handpiece Water Chilling Units 100 stability and high efficiency, when handpiece Water Chilling Units 100 is run under Xu Yuanzhong, the flow of air supply of handpiece Water Chilling Units 100 is little, tonifying Qi on-off valve 521 on secondary air supply passage 52 can be disconnected realizing the tonifying Qi separately of main air supply passage 51, this kind of control mode structure is simple, cost is low, long service life, thus the operation of handpiece Water Chilling Units 100 stability and high efficiency can be realized.
Alternatively, with reference to Fig. 1, be connected with by-pass line 7 between condenser 9 and evaporimeter 8, by-pass line 7 is provided with by-passing valve 71 with optionally conducting or block by-pass line 7.Thus, in the process that handpiece Water Chilling Units 100 is run, when compound compressor 1 operating condition is close to surge area, by-passing valve 71 is opened in time, prevents surge, ensures compressor safe operation, plays the effect of protection.It should be noted that, the surge phenomenon of compound compressor 1 should be well known to those skilled in the art, and no longer describes in detail here.
In some embodiments of the invention, with reference to Fig. 1, compound compressor 1 comprises compression unit 11 and drive motors 12, is provided with cooling liquid inlet 121 and cooling liquid outlet 122 in drive motors 12, cooling liquid inlet 121 is communicated with condenser 9, and cooling liquid outlet 122 is communicated with evaporimeter 8.Drive motors 12 cooling can adopt the pressure differential between condenser 9 and evaporimeter 8 to provide power thus, refrigerant liquid in condenser 9 is pressed into drive motors 12 inside by cooling liquid inlet 121 and carries out exchange heat with drive motors 12, the refrigerant having carried out heat exchange with drive motors 12 is got back in evaporimeter 8 by cooling liquid outlet 122 and is carried out heat exchange, thus reduces the cost of cooling drive motors 12 separately.
Further, with reference to Fig. 1, be provided with primary input pipeline 61 parallel with one another and secondary input channel 62 between condenser 9 and cooling liquid inlet 121, secondary input channel 62 is provided with cooling on-off valve 621 with optionally conducting or block secondary input channel 62.When pipeline structure is identical, the pressure differential between condenser 9 and evaporimeter 8 is larger, and the coolant quantity being supplied to drive motors 12 cooling is larger.When handpiece Water Chilling Units 100 is run under Xu Yuanzhong, handpiece Water Chilling Units 100 wasted work is less, pressure differential between condenser 9 and evaporimeter 8 is larger, the cooling coolant quantity being supplied to drive motors 12 is large, cool fully to drive motors 12, make drive motors 12 temperature low, handpiece Water Chilling Units 100 is safe and reliable to operation; When handpiece Water Chilling Units 100 is run under air conditioning condition; handpiece Water Chilling Units 100 wasted work is large; pressure differential between condenser 9 and evaporimeter 8 is less; the cooling coolant quantity being supplied to drive motors 12 is few; drive motors 12 is cooled not, makes drive motors 12 temperature higher, winding temperature even can be caused overheated; thus protection can be caused to shut down, affect handpiece Water Chilling Units 100 and normally use.
Thus, in order to ensure drive motors 12 safe operation, handpiece Water Chilling Units 100 when pressure reduction is inadequate between condenser 9 and evaporimeter 8, need can increases drive motors 12 and cool for flow quantity.Handpiece Water Chilling Units 100 is under air conditioning condition, and motor wasted work is large, and caloric value is large, the cooling on-off valve 621 on secondary input pipe can be opened, realizes primary input pipe and secondary input pipe two-way feed flow, increases cooling refrigerant liquid supply rate.Handpiece Water Chilling Units 100 is under Xu Yuanzhong, and motor wasted work is less, and caloric value is less, the cooling on-off valve 621 on secondary input pipe can be closed, only has primary input pipe feed flow, can satisfy the demands.Therefore, adopt the control mode that primary input pipeline 61 and secondary input channel 62 are regulated by cooling on-off valve 621, control method is simple, and reliability and durability, is conducive to reducing costs.
In some embodiments of the invention, at least one in first throttle element 211, second section fluid element 221, the 3rd restricting element 311 and the 4th restricting element 321 can be restricting orifice, and restricting orifice structure is simple, easy to use.The throttling arrangement of float-ball type easily damages, and is unfavorable for the operation of handpiece Water Chilling Units 100, and electric throttle valve cost is high, and wayward.
Below with reference to Fig. 1, describe the control method of the handpiece Water Chilling Units 100 of embodiment according to a second aspect of the present invention, handpiece Water Chilling Units 100 has air conditioning condition and Xu Yuanzhong two kinds of patterns.
With reference to Fig. 1, the control method of the handpiece Water Chilling Units 100 of embodiment comprises the steps: when handpiece Water Chilling Units 100 is run under air conditioning condition according to a second aspect of the present invention, controlling the first on-off valve 222 opens with conducting second section circulation road 22, and control the second on-off valve 322 is opened with conducting the 4th throttling passage 32, because handpiece Water Chilling Units 100 is under air conditioning condition, mass flow is large, conducting second section circulation road 22 and the 4th throttling passage 32 can increase the throttle efficiency of refrigerant thus, ensure the operation of handpiece Water Chilling Units 100 stability and high efficiency.
When handpiece Water Chilling Units 100 is run under Xu Yuanzhong, control the first on-off valve 222 and close to block second section circulation road 22, and control the second on-off valve 322 closes to block the 4th throttling passage 32.Only need first throttle passage 21 and the 3rd throttling passage 31 can meet the throttling demand of handpiece Water Chilling Units 100 thus, thus can saving resource, reduce costs, and the operation of handpiece Water Chilling Units 100 stability and high efficiency can be ensured.
According to the control method of embodiment of the present invention handpiece Water Chilling Units 100, by controlling the first on-off valve 222 on second section circulation road 22 and the second on-off valve 322 on the 4th throttling passage 32, the throttling demand of handpiece Water Chilling Units 100 under air conditioning condition and Xu Yuanzhong can be met, ensure the operation of handpiece Water Chilling Units 100 stability and high efficiency.
Certainly, according to the control method of the handpiece Water Chilling Units 100 of the embodiment of the present invention, can also comprise the steps; When handpiece Water Chilling Units 100 is run under air conditioning condition, controlling the first on-off valve 222 opens with conducting second section circulation road 22, and control the second on-off valve 322 is opened with conducting the 4th throttling passage 32, electric expansion valve 231 regulates aperture according to the detected value of level sensing element 81, controlling tonifying Qi on-off valve 521 in addition opens with the secondary air supply passage 52 of conducting, and controlled cooling model on-off valve 621 is opened with the secondary input pipe of conducting, the optionally conducting or block by-pass line 7 of the by-passing valve 71 on by-pass line 7.
When handpiece Water Chilling Units 100 is run under Xu Yuanzhong, control the first on-off valve 222 and close to block second section circulation road 22, and control the second on-off valve 322 closes to block the 4th throttling passage 32.Only need first throttle passage 21 and the 3rd throttling passage 31 can meet the throttling demand of handpiece Water Chilling Units 100 thus, thus can saving resource, reduce costs, and the operation of handpiece Water Chilling Units 100 stability and high efficiency can be ensured, electric expansion valve 231 regulates aperture according to the detected value of level sensing element 81, control tonifying Qi on-off valve 521 in addition to close to block secondary air supply passage 52, and controlled cooling model on-off valve 621 closes to block secondary input channel 62, the optionally conducting or block by-pass line 7 of the by-passing valve 71 on by-pass line 7.
Below with reference to Fig. 1 description according to the handpiece Water Chilling Units 100 of the present invention's specific embodiment and control method thereof, handpiece Water Chilling Units 100 comprises air conditioning condition and Xu Yuanzhong two kinds of mode of operations.
As shown in Figure 1, comprise according to the handpiece Water Chilling Units 100 of the embodiment of the present invention and connect successively and form the compound compressor 1 (such as double-stage compressor), condenser 9, nuclear one-stage throttling device 2, economizer 4, two-step throttle device 3, evaporimeter 8 etc. in loop.Wherein, double-stage compressor comprises exhaust outlet 111, one-level air entry 112 and inter-stage gas supplementing opening 113, and condenser 9 is connected with exhaust outlet 111, and evaporimeter 8 is connected with one-level air entry 112.Economizer 4 comprises import 41, liquid outlet 42 and gas discharge outlet 43, and two-step throttle device 3 is communicated with liquid outlet 42, and gas discharge outlet 43 is communicated with inter-stage gas supplementing opening 113.
One nuclear one-stage throttling device 2 is by first throttle passage 21, second section circulation road 22 and chromaffin body circulation road 23 3 tunnel are formed in parallel, first throttle passage 21 is provided with first throttle element 211 (such as restricting orifice), second section circulation road 22 is provided with second section fluid element 221 (such as restricting orifice) and controls the first on-off valve 222 (such as magnetic valve) that second section circulation road 22 connected sum blocks, chromaffin body circulation road 23 is provided with electric expansion valve 231, evaporimeter 8 is provided with level sensing element 81, electric expansion valve 231 can regulate aperture according to the detected value of level sensing element 81.
Two-step throttle device 3 is formed in parallel by the 3rd throttling passage 31 and the 4th throttling passage 32 two-way, 3rd throttling passage 31 is provided with the 3rd restricting element 311 (such as restricting orifice), and the 4th throttling passage 32 is provided with the 4th restricting element 321 (such as restricting orifice) and controls the second on-off valve 322 (such as magnetic valve) of blocking of the 4th throttling passage 32 connected sum.
Be provided with main air supply passage 51 parallel with one another and secondary air supply passage 52 between the gas discharge outlet 43 of economizer 4 and the inter-stage gas supplementing opening 113 of compressor, secondary air supply passage 52 is provided with tonifying Qi on-off valve 521 (such as magnetic valve) with optionally conducting or block secondary air supply passage 52.Be connected with by-pass line 7 between condenser 9 and evaporimeter 8, by-pass line 7 is provided with by-passing valve 71 with optionally conducting or block by-pass line 7.
Compound compressor 1 comprises compression unit 11 and drive motors 12, cooling liquid inlet 121 and cooling liquid outlet 122 is provided with in drive motors 12, cooling liquid inlet 121 is communicated with condenser 9, cooling liquid outlet 122 is communicated with evaporimeter 8, and between condenser 9 and cooling liquid inlet 121, being provided with primary input pipeline 61 parallel with one another and secondary input channel 62, secondary input channel 62 is provided with cooling on-off valve 621 (such as magnetic valve) with optionally conducting or block secondary input channel 62.
When handpiece Water Chilling Units 100 selects air conditioning condition (refrigeration mode) to run, the Suck and exhaust pressure ratio of double-stage compressor is little and mass flow is larger, the first on-off valve 222 between condenser 9 and economizer 4 in a nuclear one-stage throttling device 2 is opened, three road parallel pipelines (i.e. first throttle passage 21, second section circulation road 22 and chromaffin body circulation road 23) all conductings.First throttle element 211 and second section fluid element 221 can meet throttling requirement when handpiece Water Chilling Units 100 is freezed substantially.Level sensing element 81 controls the aperture of electric expansion valve 231, and auxiliary participation flow restriction control, ensures that each tank fill level of handpiece Water Chilling Units 100 is in more accurate, rational position.The second on-off valve 322 in two-step throttle device 3 between economizer 4 and evaporimeter 8 is opened, two-way parallel pipeline (i.e. the 3rd throttling passage 31 and the 4th throttling passage 32) all conductings, the 3rd restricting element 311 and the 4th restricting element 321 meet throttling requirement.Meanwhile, the tonifying Qi on-off valve 521 on secondary air supply passage 52 is opened, and secondary air supply passage 52 and main air supply passage 51 conducting simultaneously, meet tonifying Qi demand.Cooling on-off valve 621 in addition on secondary input pipe is opened, and primary input pipeline 61 and secondary input channel 62 are opened entirely, increases cooling coolant quantity, strengthens the dynamics to motor cooling, ensures that motor safety runs.
When handpiece Water Chilling Units 100 selects Xu Yuanzhong (ice-make mode) to run, the Suck and exhaust pressure ratio of double-stage compressor is large and mass flow is less, and the first on-off valve 222 between condenser 9 and economizer 4 in a nuclear one-stage throttling device 2 is closed, only have first throttle passage 21 and the conducting of chromaffin body circulation road 23 two-way in three road parallel pipelines.Throttling requirement when first throttle element 211 can meet handpiece Water Chilling Units 100 ice making substantially.Level sensing element 81 controls the aperture of electric expansion valve 231, and auxiliary participation flow restriction control, ensures that each tank fill level of unit is in more accurate, rational position.The second on-off valve 322 in two-step throttle device 3 between economizer 4 and evaporimeter 8 is closed, and only have the 3rd throttling passage 31 conducting in two-way parallel pipeline, the 3rd restricting element 311 meets system throttles requirement.Simultaneously because systemic circulation flow is little, the tonifying Qi on-off valve 521 on secondary air supply passage 52 is closed, and only has the conducting of main air supply passage 51, meets tonifying Qi demand.In addition, due under this operating mode, motor wasted work is less, and caloric value is less, and the cooling on-off valve 621 on secondary input channel 62 is closed, and only has primary input pipeline 61 feed flow to satisfy the demands.
According to the handpiece Water Chilling Units 100 of the embodiment of the present invention, one nuclear one-stage throttling device 2 and two-step throttle device 3 freely can switch adjustment under refrigeration (air-conditioning), ice making (ice-reserving) Double-working-condition, the main flow realizing cooling condition and ice making operating mode large discharge scope regulates, and it is low to have cost, control simple, reliability and durability advantage.Meanwhile, configuration electric expansion valve 231 can accurate adjustment portion load flow, and effectively can promote the efficiency of the sub-load of handpiece Water Chilling Units 100, the comprehensive energy efficiency of raising handpiece Water Chilling Units 100, for user saves a large amount of operating cost.
Certainly, the present invention is not limited thereto, the first on-off valve 222, second on-off valve 322, tonifying Qi on-off valve 521 and cooling on-off valve 621 can also be motor-driven valve.Compressor can be multistage centrifugal compressor, can also be frequency conversion drive multistage centrifugal compressor.Inter-stage tonifying Qi can be multistage tonifying Qi in addition, is not limited to two stages of compression second vapor injection.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (9)
1. a handpiece Water Chilling Units, is characterized in that, comprising: compound compressor, condenser, a nuclear one-stage throttling device, economizer, two-step throttle device, evaporimeter join end to end to form refrigerant circulation successively;
Described compound compressor comprises exhaust outlet, one-level air entry and inter-stage gas supplementing opening, and described condenser is connected with described exhaust outlet, and described evaporimeter is connected with described one-level air entry;
Described economizer comprises import, liquid outlet and gas discharge outlet, and described two-step throttle device is communicated with described liquid outlet, and described gas discharge outlet is communicated with described inter-stage gas supplementing opening;
A described nuclear one-stage throttling device comprises first throttle passage parallel with one another and second section circulation road, described first throttle passage is provided with first throttle element, described second section circulation road is provided with second section fluid element, described second section circulation road is also provided with the first on-off valve with optionally conducting or block described second section circulation road;
Described two-step throttle device comprises the 3rd throttling passage parallel with one another and the 4th throttling passage, described 3rd throttling passage is provided with the 3rd restricting element, described 4th throttling passage is provided with the 4th restricting element, described 4th throttling passage is also provided with the second on-off valve with optionally conducting or block described 4th throttling passage.
2. handpiece Water Chilling Units according to claim 1, it is characterized in that, level sensing element is provided with in described evaporimeter, chromaffin body circulation road is also comprised in a described nuclear one-stage throttling device, described chromaffin body circulation road is in parallel with described first throttle passage and described second section circulation road, described chromaffin body circulation road is provided with electric expansion valve, and described electric expansion valve is electrically connected the aperture to control described electric expansion valve according to the detected value of described level sensing element with described level sensing element.
3. handpiece Water Chilling Units according to claim 1, it is characterized in that, level sensing element is provided with in described evaporimeter, chromaffin body circulation road is also comprised in described two-step throttle device, described chromaffin body circulation road is in parallel with described 3rd throttling passage and described 4th throttling passage, described chromaffin body circulation road is provided with electric expansion valve, and described electric expansion valve is electrically connected the aperture to control described electric expansion valve according to the detected value of described level sensing element with described level sensing element.
4. handpiece Water Chilling Units according to claim 1, it is characterized in that, be provided with main air supply passage parallel with one another and secondary air supply passage between the gas discharge outlet of described economizer and the inter-stage gas supplementing opening of described compressor, described secondary air supply passage is provided with tonifying Qi on-off valve with optionally conducting or block described secondary air supply passage.
5. handpiece Water Chilling Units according to claim 1, is characterized in that, is connected with by-pass line between described condenser and described evaporimeter, and described by-pass line is provided with by-passing valve with optionally conducting or block described by-pass line.
6. handpiece Water Chilling Units according to claim 1, it is characterized in that, described compound compressor comprises compression unit and drive motors, cooling liquid inlet and cooling liquid outlet is provided with in described drive motors, described cooling liquid inlet is communicated with described condenser, and described cooling liquid outlet is communicated with described evaporimeter.
7. handpiece Water Chilling Units according to claim 6, it is characterized in that, be provided with primary input pipeline parallel with one another and secondary input channel between described condenser and described cooling liquid inlet, described secondary input channel is provided with cooling on-off valve with optionally conducting or block described secondary input channel.
8. the handpiece Water Chilling Units according to any one of claim 1-7, is characterized in that, at least one in described first throttle element, described second section fluid element, described 3rd restricting element and described 4th restricting element is restricting orifice.
9. a control method for the handpiece Water Chilling Units according to any one of claim 1-8, described handpiece Water Chilling Units has air conditioning condition and Xu Yuanzhong, it is characterized in that, described method comprises the steps:
When described handpiece Water Chilling Units is run under described air conditioning condition, control described first on-off valve and open with second section circulation road described in conducting, and control described second on-off valve and open with the 4th throttling passage described in conducting;
When described handpiece Water Chilling Units is run under described Xu Yuanzhong, control described first on-off valve and close to block described second section circulation road, and control described second on-off valve closedown to block described 4th throttling passage.
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| CN201510873321.7A CN105387644A (en) | 2015-12-02 | 2015-12-02 | Water chilling unit and control method thereof |
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