CN102022564A - Thermostatic expansion valve - Google Patents
Thermostatic expansion valve Download PDFInfo
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- CN102022564A CN102022564A CN2010105793035A CN201010579303A CN102022564A CN 102022564 A CN102022564 A CN 102022564A CN 2010105793035 A CN2010105793035 A CN 2010105793035A CN 201010579303 A CN201010579303 A CN 201010579303A CN 102022564 A CN102022564 A CN 102022564A
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- gas tank
- diaphragm
- expansion valve
- valve
- temperature
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Abstract
The invention discloses a thermostatic expansion valve. The thermostatic expansion valve comprises a gas tank head and a valve body; the gas tank head comprises a sensitive heating pipe, a capillary tube, a gas tank cover, a gas tank seat a drive piece, and a diaphragm; the gas tank cover is communicated with the sensitive heating pipe through the capillary tube; the diaphragm is arranged between the gas tank cover and the gas tank seat; the drive piece is arranged in the gas tank seat below the diaphragm; the lower end of the gas tank seat is connected with the valve body; and when the valve body is closed, the diaphragm protrudes towards the gas tank cover. The thermostatic expansion valve has the advantages that: the diaphragm is reversely moved, so that the working effect of the elasticity of the diaphragm in a low temperature zone is converted from influencing the opening of the expansion valve to promoting the opening of the expansion valve, and the ignorable elastic influence of the diaphragm is eliminated radically; and the diaphragm is reversely moved upwards, so that the volume of the gas tank gas is reduced correspondingly, the phenomenon of control reversion caused by the fact that working substances in a sensible bulb are possibly condensed on the gas tank head redundantly is reduced; and under the condition of not changing the volume of the sensitive heating pipe, the volume of the gas tank head is reduced to improve the control sensitivity of the sensitive heating pipe.
Description
Technical field
The present invention relates to heating power expansion valve.
Background technique
Heating power expansion valve is one of indispensable four big parts (compressor, condenser, expansion valve, vaporizer) in the freon refrigeration device (freezer, refrigerator, air-conditioning etc.), is mainly used to regulate refrigerant flow.It is the modulating valve of control flow rate, is again simultaneously the throttle valve in the refrigeration plant.It is installed between cistern and the vaporizer, and its temperature-sensitive pipe is that wrapping is at the evaporator outlet end.
The main effect of heating power expansion valve has following 3 points:
1. throttling step-down when making the refrigerant liquid of normal temperature high voltage flow through expansion valve, the refrigeration agent wet vapor that becomes low-temp low-pressure enters vaporizer, evaporation heat absorption in vaporizer, thus reach the purpose of refrigeration cool-down.
2. the variation of the evaporator outlet refrigerant vapour degree of superheat of experiencing according to sense temperature-sensitive pipe changes the open degree of expansion valve, regulates the refrigerant flow of inflow evaporator automatically, and refrigerant flow is complementary with the heat load of vaporizer all the time.
3. by the control of expansion valve, make the refrigerant vapour of evaporator outlet keep certain degree of superheat, can guarantee the making full use of of heat transfer area of vaporizer, can prevent that again compressor from liquid hammer occurring towards the cylinder phenomenon.
Heating power expansion valve is mainly by air tank head parts 1, valve body 2, spool 3, drive link 4, Regulation spring 5 parts such as grade are formed, its structure diagram as shown in Figure 1, and the air tank head parts mainly play temperature-sensitive, transfer function, it is by temperature-sensitive pipe 6, capillary tube 7, gas tank lid 8, diaphragm 9, gas tank seat 10, driver blade 11 parts such as grade are formed, wherein diaphragm is divided into two chambeies up and down with whole air tank head parts, epicoele is a closed container, filling an amount of refrigeration working medium in the temperature-sensitive pipe (is many to fill with worker quality liquid generally, other has the liquid cross charge, gas charge, mix and fill, absorptive charge etc., mainly require to decide according to systematic function), its pressure inside P
FullChange with temperature-sensitive pipe variation of temperature; Cavity of resorption communicates with the vaporizer of system, pressure and evaporating pressure P
0Consistent.Its structure diagram such as Fig. 2, shown in Figure 3.
According to the working principle of heating power expansion valve, the diaphragm of air tank head is carried out force analysis, as Fig. 4, P
0-evaporating pressure.Its size is determined by evaporating temperature.P
BulletThe pressure that-spring force is converted to.Its size is determined by spring controlled degree of tightness.P
Full-charge into the saturation pressure of working medium in the bulb.Its size is by the height decision of the character of working medium in the bulb and the evaporator outlet place refrigerant temperature experienced.P
KThe inlet and outlet pressure difference of-expansion valve the power on the spool of acting on is converted to the pressure to diaphragm.It is relevant with the valve port size, and pressure is generally minimum, and it is also minimum to the work influence of expansion valve, almost can ignore.P
FilmThe pressure that-diaphragm elastic force is converted to.The pressure loss of diaphragm itself just, it increases the work influence of the expansion valve reduction with evaporating temperature.It acts on the diaphragm below.Act on the diaphragm below 3 pressure: P are arranged
0, P
BulletAnd P
Film, these three power are closed valve; And above acting on diaphragm 2 pressure: P are arranged
FullAnd P
K, these two power are opened valve; Work as P
Full+ P
K=P
0+ P
Bullet+ P
FilmThe time, valve is in the state of equilibrium of a certain aperture.
When the heat load of vaporizer increases, cause that the degree of superheat of evaporator outlet place refrigeration agent increases, the temperature experienced of bulb raises so, its corresponding saturation pressure P
FullAlso increase, form P
Full+ P
K＞P
0+ P
Bullet+ P
FilmSo just cause diaphragm to promote drive link and move down, the aperture of valve is increased, refrigerant flow increases, and refrigerating capacity increases, thereby is complementary with the heat load of vaporizer.At this moment valve is in a new state of equilibrium again.
On the contrary, when the heat load of vaporizer reduces, cause that the degree of superheat of evaporator outlet place refrigeration agent reduces, the temperature experienced of bulb reduces so, its corresponding saturation pressure P
FullAlso reduce, form P
Full+ P
K＜P
0+ P
Bullet+ P
FilmSo just cause spring to promote to move on the drive link, the aperture of valve is reduced, refrigerant flow reduces, and refrigerating capacity reduces, thereby is complementary with the heat load of vaporizer.At this moment valve is in another new state of equilibrium again.
So heating power expansion valve is an aperture of adjusting valve according to the variation of the refrigerant superheat degree of evaporator outlet, the cold that reaches automatic adjusting refrigeration plant is to satisfy the demand that extraneous heat load constantly changes.
Heating power expansion valve in the market mainly has the following disadvantages:
1. along with the reduction of evaporating temperature, the degree of superheat of opening expansion valve increases, and makes that the temperature controlling range of expansion valve is less, is not suitable for working at low temperatures;
2. the actual useful area of diaphragm less (be generally design area 40%～60%), the unlatching sensitivity of expansion valve is lower, causes the corresponding increase of the unlatching degree of superheat of expansion valve, causes the action of expansion valve to lag behind, cause the fluctuation of vaporizer heat load, influence refrigeration.
Summary of the invention
The object of the present invention is to provide heating power expansion valve, can effectively solve existing heating power expansion valve temperature controlling range little, be not suitable for low-temperature working, open the lower problem of sensitivity.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions: heating power expansion valve, comprise air tank head and valve body, described air tank head comprises temperature-sensitive pipe, capillary tube, gas tank lid, gas tank seat, driver blade, diaphragm, and described gas tank lid communicates with the temperature-sensitive pipe by capillary tube, and described diaphragm arrangement is between gas tank lid and gas tank seat, described driver blade is arranged in the gas tank seat of diaphragm below, the lower end of described gas tank seat links to each other with valve body, and when valve body was closed, diaphragm was to gas tank lid projection.
Preferably, when valve body was opened to maximum position, diaphragm was in level; Guarantee the indeformable stroke that presses down that obtains maximum simultaneously of diaphragm.
Preferably, described gas tank tops has through hole, and described capillary tube one end is connected with through hole, and the described the other end capillaceous is connected with the temperature-sensitive pipe; Guarantee that the pressure in the temperature-sensitive pipe in time conducts.
Compared with prior art, advantage of the present invention is: the principle that has changed the diaphragm positive action of traditional heating power expansion valve, adopted the principle of diaphragm counteragent, make diaphragm elastic force change the unlatching that promotes expansion valve into from the unlatching that influences expansion valve in the work effect of low temperature area, fundamentally eliminated the elastic force influence that diaphragm self be can not ignore, because the action of diaphragm changes oppositely upwards design into, correspondingly reduced the volume of air tank head, reduced working medium in the bulb may condense in too much on the air tank head and caused that " control reverses " phenomenon, under the situation of the constancy of volume of temperature-sensitive pipe, reduce the sensitivity that the volume of air tank head can improve temperature-sensitive management and control system.
Description of drawings
Fig. 1 is the structural representation of existing heating power expansion valve;
Fig. 2 is the structural representation of air tank head in the existing heating power expansion valve;
Fig. 3 is the structural representation of diaphragm arrangement in the existing heating power expansion valve;
Fig. 4 is the stressed schematic representation of diaphragm in the existing heating power expansion valve;
Fig. 5 is the structural representation of diaphragm arrangement in the heating power expansion valve of the present invention;
Fig. 6 is the stressed schematic representation of diaphragm in the heating power expansion valve of the present invention;
Fig. 7 is the pressure-temperature curve of heating power expansion valve of the present invention and existing heating power expansion valve, refrigeration agent R22.
Embodiment
Consult the embodiment of Fig. 5 for heating power expansion valve of the present invention, heating power expansion valve, comprise air tank head and valve body, described air tank head comprises temperature-sensitive pipe 6, capillary tube 7, gas tank lid 8, gas tank seat 10, driver blade 11, diaphragm 9, described gas tank covers 8 tops and has through hole, described capillary tube 7 one ends are connected with through hole, the other end of described capillary tube 7 is connected with temperature-sensitive pipe 6, described diaphragm 9 is arranged between gas tank lid 8 and the gas tank seat 10, and described driver blade 11 is arranged in the gas tank seat 10 of diaphragm 9 belows, and the lower end of described gas tank seat 10 links to each other with valve body, when valve body is closed, diaphragm 9 covers 8 projectioies to gas tank, and when valve body was opened to maximum position, diaphragm 9 was in level.
Consult Fig. 6, the air tank head diaphragm operating principle after the change is just preceding opposite with change, force analysis: acting on the diaphragm below has 2 pressure: P
0And P
Bullet, these two power are closed valve; And above acting on diaphragm 3 pressure: P are arranged
Full, P
FilmAnd P
K, these three power are opened valve; Work as P
Full+ P
Film+ P
K=P
0+ P
Bullet, i.e. P
Full+ P
K=P
0+ P
Bullet-P
FilmThe time, valve is in the state of equilibrium of a certain aperture.With comparing before the change (is P
Full+ P
K=P
0+ P
Bullet+ P
Film), be not difficult to find out that under same operating mode, opening the required degree of superheat of expansion valve equally (is corresponding bulb pressure P
Full), after the change than the change before little 2 times P
Film, this just greatly reduces the degree of superheat that expansion valve is opened at low temperatures, even under limiting temperature, expansion valve also can normally be opened.
Here, P
FilmThe pressure that-diaphragm elastic force is converted to, the pressure loss of diaphragm itself just, it acts on the diaphragm below before the change, and the unlatching of expansion valve is played inhibition, and this inhibition increases with the reduction of evaporating temperature; It acts on the diaphragm top change back, and the unlatching of expansion valve is played a driving role, and this promoting effect also increases with the reduction of evaporating temperature.
Consult Fig. 7, example R22 be the unlatching curve of actual test of the heating power expansion valve of refrigeration agent, the A line is for adopting the needed temperature-sensitive pipe pressure-temperature curve of thermal expansion opening of valves of the present invention among the figure, the B line is the intrinsic saturation pressure-temperature curve of refrigeration agent R22, the C line is the required temperature-sensitive pipe pressure-temperature curve of the thermal expansion opening of valves of prior art, when evaporating temperature is 0 ℃, the unlatching degree of superheat of conventional expanded valve is: 3.9 ℃-0 ℃=3.9 ℃, and the unlatching degree of superheat of expansion valve of the present invention is :-1.5 ℃-0 ℃=-1.5 ℃, just begin to open when being lower than 1.5 ℃ of evaporating temperatures; When evaporating temperature is reduced to-30 ℃, the unlatching degree of superheat of conventional expanded valve is :-23 ℃-(30 ℃)=7 ℃, and the unlatching degree of superheat of expansion valve of the present invention is :-34.9 ℃-(30 ℃)=-4.9 ℃, just begin to open when being lower than evaporating temperature-4.9 ℃.This has just improved the unlatching performance of valve greatly, and particularly during low temperature, the conventional expanded valve is when-33 ℃ of temperature, and its cracking pressure is almost 0, and valve is because of cutting out cisco unity malfunction; And the cracking pressure of expansion valve of the present invention still has about 0.08MPa, makes the valve at low temperatures still can proper functioning.
Analyze the pressure x diaphragm area on the opening force of expansion valve=diaphragm top, i.e. F=P from effective diaphragm area
FullXS, and the opening force of expansion valve is exactly to overcome the required power of Regulation spring, therefore, F=F bullet=P
FullXS releases and is: S=F bullet/P
Full, the F bullet is invariable under certain operating mode in the formula, and the pressure P on diaphragm top
FullThe front is analyzed, when-33 ℃ of evaporating temperatures, than about the preceding little 0.08MPa of change, just increases so the useful area S of diaphragm is corresponding after the change.By the reality test relatively, with RF22-Φ 3 type heating power expansion valves is example, its diaphragm intended diameter is Φ 3.9cm, design area is 11.94cm2, real area when recording initial open be 6.00cm2 (for design area 47.4%), and the real area when recording initial the unlatching after improving be 14.57cm2 (for design area 122%), more more than increasing before improving, and exceeded design area, therefore the unlatching sensitivity of expansion valve improves bigger, the action of eliminating expansion valve lags behind, and reduces the fluctuation of vaporizer heat load, has greatly improved refrigeration.
In addition,, correspondingly reduced the volume of air tank head, reduced working medium in the bulb and may condense in too much on the air tank head and cause that " control reverses " phenomenon because the action of diaphragm changes oppositely upwards design into.That is to say that when the temperature of air tank head was lower than bulb, the liquid working substance in the bulb will be migrated on the air tank head, if the volume of air tank head surpasses at 1/3～1/2 o'clock of the bulb volume, bulb is with regard to effect out of hand, and " " phenomenon, expansion valve just can't proper functioning in the control reverse in generation.Therefore, under the situation of the constancy of volume of temperature-sensitive pipe, reduce the sensitivity that the volume of air tank head can improve temperature-sensitive management and control system.This effect is being played in this design virtually.
The above only is specific embodiments of the invention, but technical characteristics of the present invention is not limited thereto, and any those skilled in the art is in the field of the invention, and the variation of being done or modify all is encompassed among the claim of the present invention.
Claims (3)
1. heating power expansion valve, comprise air tank head and valve body, described air tank head comprises temperature-sensitive pipe (6), capillary tube (7), gas tank lid (8), gas tank seat (10), driver blade (11), diaphragm (9), described gas tank lid (8) communicates with temperature-sensitive pipe (6) by capillary tube (7), described diaphragm (9) is arranged between gas tank lid (8) and the gas tank seat (10), described driver blade (11) is arranged in the gas tank seat (10) of diaphragm (9) below, the lower end of described gas tank seat (10) links to each other with valve body, it is characterized in that: when valve body was closed, diaphragm (9) was to gas tank lid (8) projection.
2. heating power expansion valve as claimed in claim 1 is characterized in that: when valve body was opened to maximum position, diaphragm (9) was in level.
3. heating power expansion valve as claimed in claim 1 is characterized in that: described gas tank lid (8) top has through hole, and described capillary tube (7) one ends are connected with through hole, and the other end of described capillary tube (7) is connected with temperature-sensitive pipe (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105793035A CN102022564A (en) | 2010-12-08 | 2010-12-08 | Thermostatic expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105793035A CN102022564A (en) | 2010-12-08 | 2010-12-08 | Thermostatic expansion valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102022564A true CN102022564A (en) | 2011-04-20 |
Family
ID=43864190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105793035A Pending CN102022564A (en) | 2010-12-08 | 2010-12-08 | Thermostatic expansion valve |
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| Country | Link |
|---|---|
| CN (1) | CN102022564A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252128A (en) * | 2011-06-28 | 2011-11-23 | 浙江盾安人工环境股份有限公司 | Temperature-sensing element |
| CN102410678A (en) * | 2011-09-30 | 2012-04-11 | 浙江鸿森机械有限公司 | Heat pump type expansion valve without temperature-sensing bag |
| CN111854238A (en) * | 2019-04-25 | 2020-10-30 | 株式会社鹭宫制作所 | Expansion valve and refrigeration cycle system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4015776A (en) * | 1976-01-23 | 1977-04-05 | The Singer Company | Thermostatic expansion valve |
| US5269459A (en) * | 1991-10-17 | 1993-12-14 | Eaton Corporation | Thermally responsive expansion valve |
| US5277364A (en) * | 1992-12-18 | 1994-01-11 | Sporlan Valve Company | Dual capacity thermal expansion valve |
| JPH09273835A (en) * | 1996-04-05 | 1997-10-21 | Tgk Co Ltd | Expansion valve |
| CN1281111A (en) * | 1999-07-19 | 2001-01-24 | 株式会社不二工机 | Temperature expansion valve |
| CN2789524Y (en) * | 2005-03-16 | 2006-06-21 | 浙江三花制冷集团有限公司 | Thermal expansion valve port opening regulating structure |
| CN101245860A (en) * | 2008-01-17 | 2008-08-20 | 邓永林 | Thermal expansion valve with safety structure |
-
2010
- 2010-12-08 CN CN2010105793035A patent/CN102022564A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4015776A (en) * | 1976-01-23 | 1977-04-05 | The Singer Company | Thermostatic expansion valve |
| US5269459A (en) * | 1991-10-17 | 1993-12-14 | Eaton Corporation | Thermally responsive expansion valve |
| US5277364A (en) * | 1992-12-18 | 1994-01-11 | Sporlan Valve Company | Dual capacity thermal expansion valve |
| JPH09273835A (en) * | 1996-04-05 | 1997-10-21 | Tgk Co Ltd | Expansion valve |
| CN1281111A (en) * | 1999-07-19 | 2001-01-24 | 株式会社不二工机 | Temperature expansion valve |
| CN2789524Y (en) * | 2005-03-16 | 2006-06-21 | 浙江三花制冷集团有限公司 | Thermal expansion valve port opening regulating structure |
| CN101245860A (en) * | 2008-01-17 | 2008-08-20 | 邓永林 | Thermal expansion valve with safety structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252128A (en) * | 2011-06-28 | 2011-11-23 | 浙江盾安人工环境股份有限公司 | Temperature-sensing element |
| CN102410678A (en) * | 2011-09-30 | 2012-04-11 | 浙江鸿森机械有限公司 | Heat pump type expansion valve without temperature-sensing bag |
| CN111854238A (en) * | 2019-04-25 | 2020-10-30 | 株式会社鹭宫制作所 | Expansion valve and refrigeration cycle system |
| CN111854238B (en) * | 2019-04-25 | 2022-06-07 | 株式会社鹭宫制作所 | Expansion valve and refrigeration cycle system |
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Application publication date: 20110420 |