CN106439211B - Valve rod assembly on electronic expansion valve - Google Patents
Valve rod assembly on electronic expansion valve Download PDFInfo
- Publication number
- CN106439211B CN106439211B CN201610889502.3A CN201610889502A CN106439211B CN 106439211 B CN106439211 B CN 106439211B CN 201610889502 A CN201610889502 A CN 201610889502A CN 106439211 B CN106439211 B CN 106439211B
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- Prior art keywords
- valve
- hole
- valve rod
- electronic expansion
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007789 sealing Methods 0.000 claims abstract description 33
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 229920000459 Nitrile rubber Polymers 0.000 claims description 3
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 3
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims description 3
- 229920002530 polyetherether ketone Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a valve rod assembly on an electronic expansion valve, which comprises a valve rod and a bearing seat, wherein the valve rod is arranged in a through hole of the bearing seat, and is characterized in that: the valve rod comprises a rod body, an inner axial hole column is formed at the middle lower end of the rod body, a first transverse hole column communicated with the inner axial hole column is formed on the outer wall of the bottom of the inner axial hole column, and a second transverse shaft hole communicated with the through hole is formed in the middle of the wall body of the bearing seat; the invention not only can eliminate the axial pressure applied to the valve rod, but also has good sealing effect, and simultaneously reduces the cost so as to meet the market demand.
Description
Technical Field
The invention relates to a valve rod assembly on an electronic expansion valve.
Background
At present, electronic expansion valves at home and abroad are various in variety and different in structural characteristics, but throttle structures of the electronic expansion valves are different in size and mainly are cone valve structures. When the valve rod in the electronic expansion valve moves axially in the fully closing direction, the valve rod starts to generate axial pressure on the valve needle when the valve needle in the electronic expansion valve contacts with the valve hole below. When the electronic expansion valve is in the fully closed state, the axial pressure generated by the valve rod and the valve needle is maximum, because the valve needle is in the static state when in the fully closed state, the spring in the valve rod is pressed downwards by the valve rod, so that the spring is compressed; when the compression amount of the spring reaches a certain degree, the pressure born by the valve needle reaches the maximum; at the same time, the spring inside the valve rod generates an elastic force (namely, the valve needle generates a reverse axial pressure to the valve rod), and at the moment, the friction force between the external thread of the valve rod and the internal thread of the valve body is increased. When the air inlet pipe is filled with high-pressure air, and the electronic expansion valve is in a closed state, the valve needle seals the valve hole, and the high pressure at the upper end of the valve hole is larger than the low pressure at the lower end of the valve hole, so that a positive pressure difference is formed, and the high-pressure air generates an axial pressure on the valve needle. Therefore, the friction force between the external thread of the valve rod inside the electronic expansion valve and the internal thread of the valve body is increased due to the generation of the axial pressure, and the electronic expansion valve is more likely to be blocked because the driving force generated by the stepping motor is smaller than the reactive torque.
The valve rod assembly on the electronic expansion valve is used as an important part in the electronic expansion valve and is used for transmission, is connected with the actuating mechanism, and directly drives the valve core to axially move below the valve rod assembly so as to realize the valve opening and closing and adjusting functions. In the opening and closing process of the electronic expansion valve, the valve rod is not only a moving part and a stress part, but also a sealing part.
However, the valve rod of the traditional electronic expansion valve mainly comprises a valve rod body, a valve needle, a small steel ball, a spring and other auxiliary parts. The manufacturing process of the valve rod is complex, and the cost of parts is increased. Moreover, in the normal operation of the valve rod of the electronic expansion valve, on one hand, the valve rod is subjected to the reaction force generated by a valve needle on the valve rod in the fully closed state of the electronic expansion valve, and on the other hand, the axial pressure of gas on the valve rod is increased, so that the friction force applied to the valve rod is increased, the valve rod is abraded, and the service life of the valve rod is shortened.
The traditional valve rod is matched with the slotted hole below the valve needle through the valve needle, and leakage can be prevented only if the valve needle is well matched with the slotted hole. This requires a high degree of engagement between the needle and the slot. The degree of fit between the two needs to be increased, and the accuracy requirements of the two need to be increased. The precision requirement is improved, and high cost is required to be input.
In view of this, the present inventors have proposed an improvement in this respect, and have provided a valve stem assembly for an electronic expansion valve, which can not only eliminate the axial pressure applied to the valve stem, but also achieve a good sealing effect, and at the same time, reduce the cost, so as to meet the market demands.
Disclosure of Invention
The present invention is directed to a valve stem assembly for an electronic expansion valve that overcomes the above-mentioned shortcomings and problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The utility model provides a valve rod subassembly on electronic expansion valve, includes valve rod and bearing frame, the valve rod sets up in the through-hole of bearing frame, its characterized in that: the valve rod comprises a rod body, an inner axial hole column is formed at the middle lower end of the rod body, a first transverse hole column communicated with the inner axial hole column is formed on the outer wall of the bottom of the inner axial hole column, and a second transverse shaft hole communicated with the through hole is formed in the middle of the wall body of the bearing seat.
The invention is further provided with 2 first transverse hole columns which are positioned on the same straight line.
The invention is further provided with 2 second transverse shaft holes which are positioned on the same straight line.
The invention is further provided with the bearing seat which comprises a seat body, wherein a through hole is formed in the seat body, the through hole is matched with the valve rod, and an internal thread section matched with the external thread section is formed in the middle of the inner wall of the through hole.
The invention is further provided with the circular groove formed on the inner wall of the lower port of the seat body, the waist-shaped valve hole is formed on the outer wall of the lower port of the seat body, and the polytetrafluoroethylene sealing gasket is arranged in the circular groove.
The invention is further provided with the annular sealing groove at the upper end of the waist-shaped valve hole.
The invention is further provided with a positioning hole groove on the outer wall of the upper end of the seat body.
The invention further provides a sealing groove and a ring groove are formed on the outer wall of the middle part of the inner axial hole column.
The invention is further provided with 2 sealing grooves, and a hydrogenated nitrile rubber sealing ring or PEEK is arranged on the sealing grooves.
The invention is further provided with 2 ring grooves
Compared with the prior art, the invention has the following beneficial effects:
The invention realizes connection through internal threads and external threads between a valve rod and a bearing seat, wherein the valve rod comprises a rod body, an internal axial hole column is formed at the middle lower end of the rod body, a sealing groove and a ring groove are formed on the outer wall of the middle part of the internal axial hole column, a first transverse hole column communicated with the internal axial hole column is formed on the outer wall of the bottom of the internal axial hole column, a second transverse shaft hole communicated with the through hole is formed in the middle part of the wall body of the bearing seat, and the first transverse shaft hole and the second transverse shaft hole are positioned on the same plane; according to the invention, the axial pressure applied to the valve rod is eliminated through the communication of the first transverse shaft hole and the second transverse shaft hole, when the electronic expansion valve is filled with gas, the gas flows in from the second transverse hole column of the bearing seat and then flows into the first transverse hole column of the valve rod, and flows out from the inner axial hole column of the valve rod, so that the pressure in the electronic expansion valve is equal to the pressure at the air outlet end, and the axial pressure of the gas to the valve rod is eliminated.
The electronic expansion valve has good anti-leakage sealing effect, when the electronic expansion valve is in a fully closed state, the sealing rings sleeved on the two sealing grooves of the valve rod are contacted with the inner wall of the through hole of the bearing seat, so that gas is prevented from flowing into the electronic expansion valve from a gap between the bearing seat and the valve rod and flowing out of the first transverse hole column of the valve rod, and the gas leakage quantity is increased. And in the same way, the sealing ring of the annular sealing groove on the bearing seat also prevents the increase of the gas leakage. And the clearance between the polytetrafluoroethylene sealing gasket and the valve rod is eliminated through matching between the polytetrafluoroethylene sealing gasket and the valve rod, so that gas is effectively blocked from passing through the clearance between the polytetrafluoroethylene sealing gasket and the valve rod, and the increase of gas leakage is prevented.
The improvement of the flow control precision of the electronic expansion valve is realized by specifically adopting two annular grooves on the valve rod, when gas is introduced, the peripheries of the two annular grooves are constant in pressure, and the valve rod is prevented from generating a tendency pressure when the valve rod is subjected to air pressure. As the number of open valve pulse steps increases, the flow rate of the gas increases, and the flow characteristic curve of the gas becomes a linear state.
Therefore, the invention can solve the defects in the prior art, not only can eliminate the axial pressure generated by the valve rod under the gas, but also can reduce the cost so as to meet the market demand.
Drawings
The invention is described in detail below with reference to the attached drawings and detailed description:
Fig. 1 is a schematic view of a valve stem assembly of an electronic expansion valve according to the present invention.
FIG. 2 is a schematic view of a valve stem according to the present invention.
Fig. 3 is a cross-sectional view taken along the direction A-A in fig. 2.
Fig. 4 is a schematic structural view of a bearing housing according to the present invention.
Fig. 5 is a cross-sectional view in the direction B-B of fig. 4.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
As shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, a valve rod assembly on an electronic expansion valve comprises a valve rod 1 and a bearing seat 2, wherein the valve rod 1 is arranged in a through hole 21 of the bearing seat 2, an external thread section 16 is formed on the outer wall of the middle part of the rod body 11, the bearing seat 2 comprises a seat body 23, a penetrating through hole 21 is formed in the seat body 23, the through hole 21 is matched with the valve rod 1, an internal thread section 24 matched with the external thread section 16 is formed in the middle part of the inner wall of the through hole 21, the internal thread section 24 is matched with the external thread section 16 during installation, certain adjustment can be performed by performing thread rotation between the two sections, and the valve opening angle of the electronic expansion valve is determined by measuring the distance between the uppermost end of the bearing seat and the top of the valve rod.
In the invention, the valve rod 1 comprises a rod body 11, an inner axial hole column 12 is formed at the middle lower end of the rod body 11, a first transverse hole column 15 communicated with the inner axial hole column 12 is formed on the outer wall of the bottom of the inner axial hole column 12, a second transverse shaft hole 22 communicated with the through hole 21 is formed in the middle of the wall body of the bearing seat 2, and the first transverse shaft hole 15 and the second transverse shaft hole 22 are positioned on the same plane after installation is finished, so that standing flow is facilitated. When gas is introduced into the electronic expansion valve, no matter what state the electronic expansion valve is in, the gas flows in from the second transverse hole column 22 of the bearing seat 2, then flows into the first transverse hole column 15 of the valve rod 1, flows out from the inner axial hole column 12 of the valve rod 1, so that the pressure inside the electronic expansion valve is equal to the pressure of the air outlet end, and the axial pressure of the gas to the valve rod 1 is eliminated.
In the invention, 2 first transverse hole columns 15 are positioned on the same straight line, 2 second transverse shaft holes 22 are positioned on the same straight line, a sealing groove 13 and a ring groove 14 are formed on the outer wall of the middle part of the inner axial hole column 12, 2 sealing grooves 13 are arranged, a nitrile butadiene rubber sealing ring or PEEK is arranged on the sealing groove 13, and the arrangement of the sealing structures can eliminate the gap between the sealing grooves, effectively prevent gas from passing through the gap between the sealing grooves and prevent the increase of gas leakage. In the invention, the number of the ring grooves 14 is 2, and when gas is introduced, the peripheries of the two ring grooves 14 are constant in pressure, so that the valve rod 1 is prevented from generating a tendency pressure when being subjected to air pressure. As the number of open valve pulse steps increases, the flow rate of the gas increases, and the flow characteristic curve of the gas becomes a linear state.
In the invention, a circular groove 25 is formed on the inner wall of the lower port of the seat body 23, a waist-shaped valve hole 26 is formed on the outer wall of the lower port of the seat body 23, a polytetrafluoroethylene sealing gasket is arranged in the circular groove 25, an annular sealing groove 27 is arranged at the upper end of the waist-shaped valve hole 26, a positioning hole groove 28 is arranged on the outer wall of the upper end of the seat body 23, and the positioning hole groove 28 is used for limiting a static spring.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a valve rod subassembly on electronic expansion valve, includes valve rod and bearing frame, the valve rod sets up in the through-hole of bearing frame, its characterized in that: the valve rod comprises a rod body, an inner axial hole column is formed at the middle lower end of the rod body, 2 first transverse hole columns communicated with the inner axial hole column are formed on the outer wall of the bottom of the inner axial hole column, the two first transverse hole columns are positioned on the same straight line, a second transverse shaft hole communicated with the through hole is formed in the middle of the wall body of the bearing seat, and the number of the second transverse shaft holes is2 and positioned on the same straight line;
the bearing seat comprises a seat body, a through hole is formed in the seat body, the through hole is matched with the valve rod, and an internal thread section matched with the external thread section is formed in the middle of the inner wall of the through hole;
The method further comprises the step of forming a sealing groove and a ring groove on the outer wall of the middle part of the inner axial hole column.
2. A valve stem assembly for an electronic expansion valve as defined in claim 1, wherein: and a positioning hole groove is formed in the outer wall of the upper end of the seat body.
3. A valve stem assembly for an electronic expansion valve as defined in claim 1, wherein: a round groove is formed on the inner wall of the lower port of the seat body, a waist-shaped valve hole is formed on the outer wall of the lower port of the seat body, and a polytetrafluoroethylene sealing gasket is arranged in the round groove.
4. A valve stem assembly for an electronic expansion valve according to claim 3 and wherein: an annular sealing groove is arranged at the upper end of the waist-shaped valve hole.
5. A valve stem assembly for an electronic expansion valve as defined in claim 1, wherein: the number of the sealing grooves is 2, and hydrogenated nitrile rubber sealing rings or PEEK are arranged on the sealing grooves.
6. A valve stem assembly for an electronic expansion valve as defined in claim 1, wherein: the number of the ring grooves is 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610889502.3A CN106439211B (en) | 2016-10-12 | 2016-10-12 | Valve rod assembly on electronic expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610889502.3A CN106439211B (en) | 2016-10-12 | 2016-10-12 | Valve rod assembly on electronic expansion valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106439211A CN106439211A (en) | 2017-02-22 |
| CN106439211B true CN106439211B (en) | 2024-04-26 |
Family
ID=58174240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610889502.3A Active CN106439211B (en) | 2016-10-12 | 2016-10-12 | Valve rod assembly on electronic expansion valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106439211B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107327579B (en) * | 2017-04-10 | 2024-03-29 | 诸暨市亿霸电子阀门有限公司 | Electronic expansion valve |
| CN108644468B (en) * | 2018-05-31 | 2019-12-10 | 浙江懿康医疗科技有限公司 | Wear-resisting valve needle convenient to installation |
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| DE102011015781A1 (en) * | 2011-04-01 | 2012-10-04 | Festo Ag & Co. Kg | Throttle valve for use as clean throttle valve for developing throttle function in both directions of flow in fittings, has throttle aperture that is coaxially arranged between valve body and adjustment sleeve |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106439211A (en) | 2017-02-22 |
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