CN102563994A - Throttling system - Google Patents
Throttling system Download PDFInfo
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- CN102563994A CN102563994A CN201010604514XA CN201010604514A CN102563994A CN 102563994 A CN102563994 A CN 102563994A CN 201010604514X A CN201010604514X A CN 201010604514XA CN 201010604514 A CN201010604514 A CN 201010604514A CN 102563994 A CN102563994 A CN 102563994A
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- evaporimeter
- condenser
- superheat
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Abstract
The invention discloses a throttling system belonging to a refrigerating device and comprises a compressor, a condenser and an evaporator which are sequentially connected, wherein the outlet of the evaporator is connected with a pressure transformer and a temperature transformer. The throttling system is characterized in that at least two electromagnetic valves are arranged between the evaporator and the condenser and are connected with a PLC (Programmable Logic Controller), and the PLC is connected with the temperature transformer and the pressure transformer. The PLC acquires signals of the pressure transformer and the temperature transformer, and controls the switching on or off of the electromagnetic valves according to the degree of superheat, figured out by the PLC. The throttling system has the advantages of high response speed, large regulation range, high precision and low price.
Description
Technical field
The invention belongs to refrigerating plant, be specifically related to a kind of throttle system.
Background technology
Throttle system commonly used in the market often adopts the heating power expansion valve throttling and adopts the electric expansion valve throttling.
The heating power expansion valve Throttle Principle is following in the freon refrigeration system: heating power expansion valve is regulated the flow of cold-producing medium through experiencing the size of the evaporator outlet refrigerant vapour degree of superheat, to keep the constant degree of superheat, on control principle, belongs to proportional controller.Though heating power expansion valve can be regulated the flow of cold-producing medium automatically, its shortcoming also is very significant:
(1) long to the time delay of degree of superheat response, particularly volume postpones.The superheated steam at evaporator outlet place is passed to the bulb shell to heat earlier, and itself just has bigger thermal inertia the bulb shell, has caused certain volume to postpone, and the bulb shell is passed to temperature sensing medium to heat, and this has produced further delay again.The result who postpones can cause heating power expansion valve alternately to hold greatly or turn down, and promptly produces oscillatory occurences.Open when too much when heating power expansion valve, the evaporator outlet degree of superheat is on the low side, and pressure of inspiration(Pi) rises; When heating power expansion valve was opened too smallly, the evaporimeter feed flow was not enough, and pressure of inspiration(Pi) reduces.No matter be that the degree of superheat is higher or the degree of superheat is on the low side, all can have a negative impact to the economy and the security of whole system.Experiment shows that the heating power expansion valve regulating effect is wanted tens minutes to midget plant, and large-scale plant wants 30 min～40 min just stable.
(2) adjustable range is limited.Because the deflection of the diaphragm that is connected with the heating power expansion valve needle is limited, make that the moving displacement of needle is less, so flow adjustment range is little.This is for the bigger freezer of load variations or adopt the system of frequency-changeable compressor, and heating power expansion valve just can't meet the demands.
(3) degree of regulation is low.Executing agency's diaphragm of heating power expansion valve is because factors such as machining accuracy and installations, and sensitivity is out of shape in distortion that can produce and influence, so be difficult to the degree of regulation that reaches higher.
Electric expansion valve expensive, usually said electric expansion valve comprise valve body, controller, temperature sensor and pressure sensor, display (relevant parameters such as the demonstration and the adjustment degree of superheat) and transformer in fact.
Electric expansion valve in use; Because the system the inside has bloated thing (this bloated thing comprises because the compressor iron filings mud that the rotatable parts rubstrip comes in operation process), is permanent magnet and inside the valve body stepper motor, the stator of stepper motor are arranged; The bloated thing that has of permanent magnet meeting adsorption system the inside; Can influence the work of stepper motor after time is long, electric expansion valve occur through regular meeting and lose the step phenomenon, cause reduction the evaporator superheat control accuracy.
Summary of the invention
The problem that the present invention will solve is that heating power expansion valve is slow to degree of superheat response speed in the throttle system, adjusting range is little, precision is low; And electric expansion valve costs an arm and a leg, control accuracy is low, provides that a kind of response speed is fast, adjusting range is big, precision is high, low-cost throttle system.
Technical scheme of the present invention realizes in the following manner: a kind of throttle system; Comprise the compressor, condenser and the evaporimeter that link to each other successively; Evaporator outlet connects pressure transmitter and temperature transmitter; Be provided with at least two magnetic valves between said evaporimeter and the condenser, magnetic valve is connected with PLC, and PLC links to each other with pressure transmitter with temperature transmitter.
Be provided with three or four or five or six or seven magnetic valves between said evaporimeter and the condenser.
The present invention can the controlled in real-time evaporimeter the degree of superheat (refrigerating capacity and the refrigerating capacity when worst cold case of evaporimeter when worst hot case is that bigger difference is arranged; The heat exchange area that can guarantee evaporimeter all is in maximized utilization), the heat of raising evaporimeter.With respect to the throttle system of electronic expansion, the present invention adopts magnetic valve in addition, and is cheap, and response speed is fast.In addition, through the experiment and the checking of test result, the present invention has very big advantage aspect energy-conservation, and quick-freezing plant of the present invention drops to-35 ℃ from 25 ℃ above freezing, needs get final product in 14 to 15 minutes, and the fastest also needs of throttle system in the market about 30 minutes.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1.
Fig. 2 is the Throttle Principle sketch map of the embodiment of the invention 1.
Fig. 3 is the structural representation of the embodiment of the invention 2.
Fig. 4 is the Throttle Principle sketch map of the embodiment of the invention 2.
The specific embodiment
Embodiment 1: as shown in Figure 1, the present invention includes the compressor, condenser and the evaporimeter that link to each other successively, and evaporator outlet connects pressure transmitter and temperature transmitter, is provided with two magnetic valve D between said evaporimeter and the condenser
1And D
2, magnetic valve D
1And D
2Be connected with PLC, PLC links to each other with pressure transmitter with temperature transmitter.PLC gathers the signal of pressure transmitter and temperature transmitter, and controls the switch of magnetic valve according to the degree of superheat that PLC calculates.
Among the present invention, cold-producing medium returns compressor via compressor, condenser, magnetic valve and evaporimeter, forms an operation cycle.
The degree of superheat loop control theory of present embodiment is as shown in Figure 2: the evaporimeter delivery outlet connects pressure transmitter and temperature transmitter; PLC goes out the degree of superheat according to the calculated signals that pressure transmitter and temperature transmitter transfer out, and regulates magnetic valve D according to setting the degree of superheat with the difference of measuring the degree of superheat then
1And D
2Keying, the flow of control cold-producing medium, and then the degree of superheat in the control system makes refrigeration system normally move.
Embodiment 2: as shown in Figure 3, be provided with four magnetic valve D among the present invention between evaporimeter and the condenser
1, D
2, D
3And D
4Other structures are with embodiment 1.
The degree of superheat loop control theory of present embodiment is as shown in Figure 4: magnetic valve D wherein
1, D
2, D
3And D
4Refrigerating capacity can be different; Also can be identical, the evaporimeter delivery outlet connects pressure transmitter and temperature transmitter, and PLC goes out the degree of superheat according to the calculated signals that pressure transmitter and temperature transmitter transfer out; Set the degree of superheat and the difference of measuring the degree of superheat, regulate magnetic valve D
1, D
2, D
3And D
4In one or two or three or keyings of four, the flow of control cold-producing medium, and then the degree of superheat of control evaporimeter make refrigeration system normally move.
Embodiment 3: be provided with three magnetic valves in the present embodiment between evaporimeter and the condenser.Other structures are with embodiment 1.
Embodiment 4: be provided with five magnetic valves in the present embodiment between evaporimeter and the condenser.Other structures are with embodiment 1.
Embodiment 5: be provided with six magnetic valves in the present embodiment between evaporimeter and the condenser.Other structures are with embodiment 1.
Embodiment 6: be provided with seven magnetic valves in the present embodiment between evaporimeter and the condenser.Other structures are with embodiment 1.
Embodiment 7: present embodiment comprises compressor, condenser and the evaporimeter that links to each other successively; Evaporator outlet connects pressure transmitter and temperature transmitter; Be provided with at least two magnetic valves between said evaporimeter and the condenser; Magnetic valve is connected with PLC, and PLC links to each other with pressure transmitter with temperature transmitter.Other are with embodiment 1.
Claims (2)
1. throttle system; Comprise the compressor, condenser and the evaporimeter that link to each other successively; Evaporator outlet connects pressure transmitter and temperature transmitter; It is characterized in that: be provided with at least two magnetic valves between said evaporimeter and the condenser, magnetic valve is connected with PLC, and PLC links to each other with pressure transmitter with temperature transmitter.
2. throttle system according to claim 1 is characterized in that: be provided with three or four or five or six or seven magnetic valves between said evaporimeter and the condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010604514XA CN102563994A (en) | 2010-12-24 | 2010-12-24 | Throttling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010604514XA CN102563994A (en) | 2010-12-24 | 2010-12-24 | Throttling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102563994A true CN102563994A (en) | 2012-07-11 |
Family
ID=46410098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010604514XA Pending CN102563994A (en) | 2010-12-24 | 2010-12-24 | Throttling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102563994A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910386A (en) * | 2016-06-06 | 2016-08-31 | 洛阳普瑞曼自动控制技术有限公司 | Intelligent petroleum benzine conversion device |
| CN109976400A (en) * | 2018-12-17 | 2019-07-05 | 西安航天化学动力有限公司 | Solid engines cure under pressure automatic control device and control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02195164A (en) * | 1989-01-21 | 1990-08-01 | Mitsubishi Electric Corp | Freezing and air conditioning state monitor |
| JPH0861815A (en) * | 1994-08-19 | 1996-03-08 | Hitachi Ltd | Air conditioner |
| CN201053793Y (en) * | 2007-06-11 | 2008-04-30 | 洪国民 | Pressure regulation device of super low temperature refrigerating machine |
| KR20090074438A (en) * | 2008-01-02 | 2009-07-07 | 엘지전자 주식회사 | Air conditioning system |
| CN201429258Y (en) * | 2009-07-01 | 2010-03-24 | 河南千年冷冻设备有限公司 | Refrigeration system |
-
2010
- 2010-12-24 CN CN201010604514XA patent/CN102563994A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02195164A (en) * | 1989-01-21 | 1990-08-01 | Mitsubishi Electric Corp | Freezing and air conditioning state monitor |
| JPH0861815A (en) * | 1994-08-19 | 1996-03-08 | Hitachi Ltd | Air conditioner |
| CN201053793Y (en) * | 2007-06-11 | 2008-04-30 | 洪国民 | Pressure regulation device of super low temperature refrigerating machine |
| KR20090074438A (en) * | 2008-01-02 | 2009-07-07 | 엘지전자 주식회사 | Air conditioning system |
| CN201429258Y (en) * | 2009-07-01 | 2010-03-24 | 河南千年冷冻设备有限公司 | Refrigeration system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910386A (en) * | 2016-06-06 | 2016-08-31 | 洛阳普瑞曼自动控制技术有限公司 | Intelligent petroleum benzine conversion device |
| CN109976400A (en) * | 2018-12-17 | 2019-07-05 | 西安航天化学动力有限公司 | Solid engines cure under pressure automatic control device and control method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120711 |