CN113685557A - Electronic expansion valve and refrigeration equipment - Google Patents
Electronic expansion valve and refrigeration equipment Download PDFInfo
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- CN113685557A CN113685557A CN202111156319.XA CN202111156319A CN113685557A CN 113685557 A CN113685557 A CN 113685557A CN 202111156319 A CN202111156319 A CN 202111156319A CN 113685557 A CN113685557 A CN 113685557A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 78
- 238000000576 coating method Methods 0.000 claims abstract description 78
- 230000001050 lubricating effect Effects 0.000 claims abstract description 43
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000005299 abrasion Methods 0.000 abstract description 7
- 239000000314 lubricant Substances 0.000 description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000004642 Polyimide Substances 0.000 description 6
- 229920001721 polyimide Polymers 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 230000007774 longterm Effects 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- -1 Polytetrafluoroethylene Polymers 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
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- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
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- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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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
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention discloses an electronic expansion valve and refrigeration equipment. The electronic expansion valve comprises a valve housing, a nut, a rotor assembly, a screw and a valve needle, wherein the valve housing is provided with a valve port; the nut is arranged in the valve shell; the rotor assembly is arranged in the valve shell; one end of the screw is connected with the rotor component, the other end of the screw is inserted into the nut and is in threaded connection with the nut, and the screw is provided with a through hole; the valve needle is arranged in a penetrating mode through the through hole and the nut, the valve needle is inserted into the valve port, the screw rod can reciprocate along the axial direction of the nut to drive the valve needle to move to correspondingly open or close the valve port, and a lubricating coating is arranged on the outer surface of the valve needle and/or the inner wall of the through hole of the screw rod. The electronic expansion valve can reduce the abrasion of the valve needle and improve the action performance of the valve needle.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to an electronic expansion valve and refrigeration equipment.
Background
In the related art, a valve needle and a screw of an electronic expansion valve have relative sliding, and during long-term use, the valve needle and the screw are easily abraded to generate debris, so that the action performance of the valve needle is poor, and the reliability of the electronic expansion valve is affected.
Disclosure of Invention
The invention mainly aims to provide an electronic expansion valve, aiming at reducing the abrasion of a valve needle and in the using process.
In order to achieve the above object, the present invention provides an electronic expansion valve comprising:
a valve housing provided with a valve port;
a nut mounted within the valve housing;
a rotor assembly disposed within the valve housing;
one end of the screw rod is connected with the rotor assembly, the other end of the screw rod is inserted into the nut and is in threaded connection with the nut, and the screw rod is provided with a through hole; and
the valve needle penetrates through the through hole and the nut, the valve needle is inserted into the valve port, the screw rod can reciprocate along the axial direction of the nut so as to drive the valve needle to move to correspondingly open or close the valve port, and a lubricating coating is arranged on the outer surface of the valve needle and/or the surface of the screw rod.
Optionally, when the screw is provided with a lubricating coating, at least the inner wall of the through hole of the screw is provided with the lubricating coating.
Optionally, the valve needle comprises a valve needle tip end section, a main body section and a through section, which are sequentially connected along the axial direction of the nut, wherein the valve needle tip end section is matched with the valve port, the main body section is in guiding fit with the nut, the through section is arranged through the through hole, and when the outer surface of the valve needle is provided with a lubricating coating, at least the outer surface of the valve needle tip end section is provided with the lubricating coating.
Optionally, when the outer surface of the valve needle is provided with a lubricating coating, the outer surface of the main body section and/or the through section is provided with the lubricating coating.
Optionally, the valve needle further comprises a fixing section, the fixing section is arranged at one end, far away from the main body section, of the penetrating section, the fixing section extends out of one end, far away from the nut, of the screw rod, the valve needle assembly further comprises a positioning piece, and the positioning piece is arranged at the fixing section.
Optionally, the positioning member is a positioning sleeve sleeved on the fixed section.
Optionally, one end of the positioning element close to the valve rod is provided with the lubricating coating.
Optionally, the inner wall of the nut is provided with the lubricating coating.
Optionally, the nut includes a metal seat and a nut sleeve, one end of the nut sleeve is disposed toward the valve port, and the metal seat is disposed on an outer peripheral wall of one end of the nut sleeve facing the valve port and is fixedly connected to an inner wall of the valve housing;
the nut sleeve comprises a thread section and a guide section, the thread section is in threaded connection with the screw, the guide section is in guide fit with the valve needle, and the lubricating coating is arranged on the inner wall of the thread section and/or the inner wall of the guide section.
The invention also proposes a refrigeration device comprising an electronic expansion valve as defined in any one of the above.
According to the technical scheme, the rotor assembly rotates to drive the screw to reciprocate along the circumferential direction of the nut, so that the valve needle is pushed to move to open or close the valve port, and the lubricating coating is arranged on the relative movement surface of the valve needle and the valve rod, so that the abrasion between the valve needle and the screw is reduced, and the action performance of the valve needle is better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present invention;
fig. 2 is a schematic structural view of the nut in fig. 1.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an electronic expansion valve 100, which is applied to a refrigeration system. The refrigerating system can be a refrigerating system of an air conditioner, a refrigerator, a heat pump water heater or other refrigerating and heating equipment. The flow rate of the refrigerant in the refrigeration system can be controlled by the electronic expansion valve 100100.
In one embodiment of the present invention, as shown in fig. 1, the electronic expansion valve 100 includes a valve housing 10, a nut 20, a rotor assembly 30, a screw 40, and a valve needle 50. Wherein the valve housing 10 is provided with a valve port 101; the nut 20 is installed in the valve housing 10 and is fixedly connected to the inner wall of the valve housing 10 by welding, interference, or the like. The rotor assembly 30 is arranged in the valve housing 10, one end of the screw 40 is fixedly connected with the rotor assembly 30 by welding and the like, the other end of the screw 40 is inserted in the nut 20 and is in threaded connection with the nut 20, and the screw 40 is provided with a through hole. The valve needle 50 is arranged through the through hole and the nut 20, the valve needle 50 is inserted into the valve port 101, the screw 40 can reciprocate along the axial direction of the nut 20 to drive the valve needle 50 to move to correspondingly open or close the valve port 101, and a lubricating coating is arranged on the outer surface of the valve needle 50 and/or the inner wall of the through hole of the screw 40.
It can be understood that the electronic expansion valve 100 further includes a stator assembly 60 and an elastic member 70, the stator assembly 60 is sleeved outside the valve housing 10, the stator assembly 60 is disposed at a position corresponding to the rotor assembly 30, the rotor assembly 30 is fixedly connected to the screw 40, one end of the screw 40 is disposed in the nut 20 and can reciprocate between the first position and the second position along the axial direction of the nut 20, the screw 40 is provided with a through hole, the valve needle 50 is movably disposed through the through hole and the nut 20, and the elastic member 70 is disposed between the valve needle 50 and the screw 40. It should be noted that, the elastic element 70 is a spring, after the electronic expansion valve 100 is powered on, the rotor assembly 30 rotates along a preset direction to drive the screw 40 to rotate, the screw 40 is in threaded fit with the nut 20, so that the screw 40 moves towards the valve port 101 along the axial direction of the nut 20, and the screw 40 presses the elastic element 70 to move the valve needle 50 towards the valve port 101 along the axial direction of the nut 20, so as to close the valve port 101; the magnetic rotor assembly 30 rotates in a direction opposite to the predetermined direction to drive the screw 40 to rotate, so that the screw 40 moves in a direction away from the valve port 101 along the axial direction of the nut 20, the screw 40 abuts against the positioning member 80 towards one end of the valve port 101, so that the valve needle 50 moves in the direction away from the valve port 101 along the axial direction of the nut 20, and the valve port 101 is opened to adjust the flow rate of the refrigerant.
Due to the possibility of eccentricity of the needle 50, during long-term use, as the number of times the needle 50 is opened and closed increases, the outer surface of the needle 50 may contact with the screw 40 or the nut 20, which may cause abrasion between the valve stem and the needle 50, and the contact surface of the needle 50 and the screw 40 may generate powder particles, thereby affecting the motion performance of the needle 50. In the present embodiment, by providing a lubricant coating on the outer surface of the needle 50 and/or the surface of the screw 40, wear is not generated even when the needle 50 and the screw 40 relatively rotate in a collision state, and powdery particles that disturb the rotation of the needle 50 are not generated, so that the wear of the needle 50 can be reduced, and at the same time, the operation performance of the needle 50 is improved, and the reliability of the entire electronic expansion valve 100 is higher.
It should be noted that the lubricant coating may be only disposed on the outer surface of the valve needle 50, only disposed on the inner surface or the outer surface of the screw 40, or disposed on both the outer surface of the valve needle 50 and the inner surface of the screw 40, as long as the wear of the screw 40 or the valve needle 50 can be reduced, which is not limited herein.
The main component of the lubricating coating layer is Polytetrafluoroethylene (PTFE), epoxy resin, polyimide, N-methylpyrrolidone, molybdenum disulfide, graphite, or the like. The PTFE has good corrosion resistance, high lubricity and elasticity, is a main material selected by soft sealing, and mainly plays a role in lubricating and increasing elasticity in the structure so as to reduce the friction resistance of a friction pair and make up for slight defects on the sealing pair. The polyimide plays a role in bonding, and particularly can increase the wear resistance of the coating and prolong the service life of the coating. The N-methyl pyrrolidone can uniformly disperse component particles in the coating, so that the thickness of the coating is uniform, the friction resistance is reduced to the minimum, and the friction coefficient and the strength of the coating can be further reduced by the molybdenum disulfide and the graphite.
Because the coating contains PTFE, molybdenum disulfide, graphite, polyimide, etc., the contact surface friction coefficient is low after coating, the wearability is good, spraying thickness can select suitable spraying thickness according to the harsh nature of operating condition simultaneously, the coating thickness is from 5 mu m ~ 50 mu m optional wantonly, compromise economic nature, this scheme is preferred 5 ~ 25 mu m, it has huge superiority to electroplate PTFE + NIP technology than the tradition, traditional PTFE + NIP coating thickness can only reach 3 mu m, the PTFE thickness that can play the lubrication action is less than one tenth of whole coating thickness degree, this coating is easy to wear and tear, and only can implement the whole coating of part, can't avoid the face of weld.
For optimal coating performance, the PTFE content of the coating material is 10% to 50%, with PTFE contents below 10% reducing the lubricating effect and PTFE contents above 50% causing insufficient coating adhesion and coating strength. The content of the polyimide is 5-30%, the content of the polyimide is less than 5% so as not to improve the adhesion force of the coating and improve the abrasion resistance of the coating, and the content of the polyimide is more than 30% so as to cause the lubrication effect of the coating to be insufficient. The content of N-methyl pyrrolidone is 0-40%, the N-methyl pyrrolidone plays a role of dispersing coating particles, and the content of N-methyl pyrrolidone higher than 40% causes insufficient strength, adhesiveness and lubricating effect of the coating.
In one embodiment, when the screw 40 is provided with a lubricating coating, at least the inner wall of the through hole of the screw 40 is provided with a lubricating coating. The coating is very convenient to implement, and the coating is covered on the required contact surface in a coating mode, and can be sprayed locally or integrally. It can be understood that, during the process of the screw 40 rotating to push the valve needle 50 to move repeatedly, the through hole of the screw 40 and the valve needle 50 will rotate relatively, and due to the possibility of the valve needle 50 being eccentric, the valve needle 50 and the inner wall of the through hole of the screw 40 will be worn by touch, so in order to reduce the wear of the valve needle 50 and improve the performance of the valve needle 50, at least a lubricating coating should be sprayed on the inner wall of the through hole of the screw 40.
Of course, it should be noted that, considering that the external thread of the screw 40 may be worn away during the process of matching the rotating thread with the thread of the nut 20 during long-term use, in other embodiments, the lubricating coating may be sprayed on the outer surface of the screw 40 at the same time, so as to enhance the wear resistance thereof, prevent the small particles generated by the thread loss during long-term use from affecting the movement of the valve needle 50, and make the action performance of the valve needle 50 better.
In one embodiment, the valve needle 50 includes a valve needle tip end section 501, a main body section 502 and a through section 503 which are sequentially connected along the axis of the nut 20, the valve needle tip end section 501 is matched with the valve port 101, the main body section 502 is matched with the nut 20 in a guiding manner, the through section 503 is arranged through the through hole, and when the outer surface of the valve needle 50 is provided with a lubricating coating, at least the outer surface of the valve needle tip end section 501 is provided with the lubricating coating.
It should be noted that, when the stepping motor stator is commanded to be fully closed, the valve needle tip end section 501 of the valve needle 50 is in contact with and in close contact with the valve port 101. Since both valve tip end segment 501 and valve port 101 are machined from stainless steel, the seal between the two is a hard seal in the prior art. If a slight defect exists in valve tip end segment 501 and valve port 101, then an internal leakage out-of-tolerance phenomenon may occur, resulting in a failure or rejection of the entire product. In the present embodiment, in consideration of the cost of coating the surface of the valve needle 50, the soft sealing of the valve needle tip end section 501 with the valve port 101 can be realized by coating the outer surface of the valve needle tip end section 501 with a lubricating coating. Meanwhile, the lubricating coating has strong wear resistance, so that even if the valve needle tip end section 501 and the valve port 101 rotate in a contact state, no wear is generated, and the risk of internal leakage of the electronic expansion valve 100 in the use process is reduced. Meanwhile, the service life of the electronic expansion valve 100 is made longer.
Further, where the outer surface of valve needle 50 is provided with a lubricious coating, the outer surface of body section 502 and/or through section 503 is provided with a lubricious coating. That is, the magnetic rotor assembly 30 rotates in a direction opposite to the predetermined direction to drive the screw 40 to rotate, so that the screw 40 moves in a direction away from the valve port 101 along the axial direction of the nut 20, the screw 40 abuts against the positioning sleeve towards one end of the valve port 101, so that the valve needle 50 moves in the direction away from the valve port 101 along the axial direction of the nut 20, and the valve needle tip end section 501 is away from the valve port 101 to open the valve port 101. Due to the possibility of eccentricity of the valve needle 50, the main body segment 502 of the valve needle 50 may contact the inner wall of the nut 20 to generate friction when moving axially along the nut 20 in the nut 20, resulting in wear of the main body segment 502. Therefore, the main body section 502 of the valve needle 50 may be coated with the above-mentioned lubricant coating to reduce the friction force that may be generated during the relative sliding, and at the same time, reduce the wear thereof, and improve the performance of the electronic expansion valve 100. Accordingly, the through-section 503 of the valve needle 50 directly passes through the through-hole of the screw 40 and slides relative to the screw 40 during the ascending and descending processes, and in other embodiments, a lubricating coating may be sprayed on the outer surface of the through-section 503 of the valve needle 50 to prevent the through-section 503 of the valve needle 50 from being worn.
It should be noted that, considering the data of the wear of the main body section 502 and the through pipe per unit time in the actual process of the electronic expansion valve 100 and the cost of spraying the lubricant coating, the user may choose to only spray the lubricant coating on the outer surface of the main body section 502 of the valve needle 50, only spray the lubricant coating on the outer surface of the through section 503 of the valve needle 50, spray the lubricant coating on both the main body section 502 and the through section 503 of the valve needle 50, or spray the lubricant coating on the outer surface of the valve needle 50 as a whole, which is not limited herein.
In an embodiment, the valve needle 50 further includes a fixing section 504, the fixing section 504 is disposed at an end of the penetrating section 503 away from the main body section 502, the fixing section 504 is disposed at an end of the screw 40 extending away from the nut 20, the valve needle 50 assembly further includes a positioning element 80, and the positioning element 80 is fixedly connected to the fixing section 504 by welding or interference connection. The magnetic rotor assembly 30 rotates in the direction opposite to the preset direction to drive the screw 40 to rotate, so that the screw 40 moves in the axial direction of the nut 20 in the direction away from the valve port 101, the screw 40 abuts against the positioning sleeve, and the valve needle 50 moves in the axial direction of the nut 20 in the direction away from the valve port 101, so that the valve needle tip end section 501 is away from the valve port 101 to open the valve port 101, and therefore, the screw 40 and the valve needle 50 do not need to be integrally arranged, and the valve needle 50 can move more flexibly.
Optionally, as shown, the positioning member 80 is a positioning sleeve sleeved on the fixed segment 504. The positioning sleeve is hollow cylindrical and is sleeved and fixed on the fixing section 504 of the valve needle 50, and is uniformly distributed around the fixing section 504 in the circumferential direction, so that the quality of the positioning section of the valve needle 50 is more uniform, when the positioning sleeve is pushed by the screw 40 to move towards the direction far away from the valve port 101, the moving coaxiality of the valve needle 50 is higher, and the needle tip end section 501 of the valve does not move eccentrically in the moving process, so that relative friction is generated between the needle tip end section 501 and the valve port 101 or the screw 40, and the action performance of the valve needle 50 is influenced. It should be noted that, in other embodiments, the positioning element 80 may be a rectangular body or a spherical body, as long as it can drive the screw 40 to indirectly drive the valve needle 50 to move upwards, and at the same time, it is possible to prevent the valve needle 50 from moving eccentrically during the movement.
In one embodiment, the end of the positioning member 80 adjacent to the screw 40 is provided with a lubricious coating. It can be understood that, during the movement of the screw 40 in the axial direction of the nut 20 toward the direction away from the valve port 101, in order to open the valve port 101 by the valve needle 50, the upper end surface of the screw 40 will inevitably abut against and push the positioning member 80 to move away from the valve port 101, so that there will be a relative abutting force between the upper end surface of the screw 40 and the lower surface of the positioning member 80, and during a long period of use, the surface of the positioning member 80 abutting against the screw 40 is easily worn to generate fine wear powder, which may enter the through hole of the screw 40 to cause the valve needle 50 to be stuck. And a lubricating coating is sprayed on one surface of the positioning piece 80 close to the screw 40, namely the surface abutting against the screw 40, so that the abrasion between the positioning piece 80 and the screw 40 is reduced, and the action performance of the valve needle 50 is better.
In an embodiment, the inner wall of the nut 20 is provided with a lubricating coating. It will be appreciated that, due to the possibility of eccentricity of the valve needle 50, the body segment 502 of the valve needle 50 may contact the inner wall of the nut 20 to generate friction as it moves axially along the nut 20 within the nut 20, resulting in wear of the body segment 502. Therefore, in addition to the above-mentioned lubricant coating applied to the main body section 502 of the valve needle 50, the lubricant coating can also be applied to the inner wall of the nut 20, so as to reduce the friction force that may be generated during the relative sliding, reduce the wear of the valve needle 50, and improve the performance of the electronic expansion valve 100.
Alternatively, as shown in fig. 1 and 2, the nut 20 includes a metal seat 21 and a nut sleeve 22, one end of the nut sleeve 22 is disposed toward the valve port 101, and the metal seat 21 is disposed on an outer peripheral wall of one end of the nut sleeve 22 toward the valve port 101 and is fixedly connected to an inner wall of the valve housing 10; the nut sleeve 22 comprises a threaded section 221 and a guide section 222, the threaded section 221 is in threaded connection with the screw 40, the guide section 222 is in guiding fit with the valve needle 50, and the inner wall of the threaded section 221 and/or the inner wall of the guide section 222 is/are provided with a lubricating coating.
The outer wall of the metal seat 21 and the inner peripheral wall of the valve housing 10 are connected and fixed by welding, and the welding has high connection strength to prevent the nut 20 and the valve housing 10 from being displaced relative to each other, and further fix the nut 20 to the valve housing 10. In other embodiments, the metal bases 21 may be fixedly connected to each other by snapping or interference connection. The nut 20 is cylindrical, the nut 20 has a through hole extending along the axial direction, the through hole has a threaded section 221 and a guiding section 222 which are arranged along the axial direction of the valve housing 10 and point to the direction of the valve port 101, the screw 40 is in threaded connection with the threaded section 221, the guiding section 222 is in guiding fit with the valve needle 50, and one end of the nut 20 facing the valve port 101 is connected in the mounting hole. The center of the mounting hole coincides with the circle center of the circle where the outer peripheral wall of the connecting seat is located, and the through hole and the mounting hole are coaxially arranged so as to ensure the coaxiality between the valve needle 50 penetrating through the through hole and the valve port 101.
In this embodiment, the threaded rod 40 has an external thread, the threaded section 221 of the nut sleeve 22 has an internal thread, and the external thread of the threaded rod 40 is engaged with the internal thread of the nut sleeve 22 to realize a threaded fit. It can be understood that, during the engagement process, the problem that the screw 40 and the nut 20 are locked due to the unsmooth thread fit between the screw 40 and the nut 20 is easily caused, and during the use process, friction powder is easily generated between the screw 40 and the internal thread of the nut sleeve 22 to cause the valve needle 50 to be locked, and the friction force between the screw 40 and the nut 20 can be greatly reduced by spraying the lubricating coating on the outer wall of the thread section 221, so that the abrasion between the screw 40 and the nut 20 is reduced, and the moving performance of the valve needle 50 is improved.
Accordingly, during the guiding engagement between the valve needle 50 and the guiding section 222 of the nut 20 cap, due to the possibility of eccentricity of the valve needle 50, the valve needle 50 contacts the inner wall of the guiding section 222 of the nut 20 cap and rotates relatively to generate friction, and the same effect of preventing the valve needle 50 from being worn can be achieved by spraying the lubricating coating on the inner wall of the guiding section 222 or spraying the lubricating coating on the outer surface of the valve needle 50, so that the valve needle 50 has better action performance. It should be noted that, in other embodiments, the lubricating coating may be sprayed on the inner wall of the threaded section 221 and the inner wall of the guiding section 222 of the nut 20, which are not limited herein, in consideration of the anti-friction effect, performance and production cost.
The present invention further provides a refrigeration device, which includes an electronic expansion valve 100, and the specific structure of the electronic expansion valve 100 refers to the above embodiments, and since the refrigeration device adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not described in detail herein. The refrigeration equipment can be an air conditioner, a refrigerator, a heat pump water heater and the like.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An electronic expansion valve, comprising:
a valve housing provided with a valve port;
a nut mounted within the valve housing;
a rotor assembly disposed within the valve housing;
one end of the screw rod is connected with the rotor assembly, the other end of the screw rod is inserted into the nut and is in threaded connection with the nut, and the screw rod is provided with a through hole; and
the valve needle penetrates through the through hole and the nut, the valve needle is inserted into the valve port, the screw rod can reciprocate along the axial direction of the nut so as to drive the valve needle to move to correspondingly open or close the valve port, and a lubricating coating is arranged on the outer surface of the valve needle and/or the surface of the screw rod.
2. The electronic expansion valve according to claim 1, wherein when the screw is provided with a lubricating coating, at least an inner wall of the through-hole of the screw is provided with the lubricating coating.
3. The electronic expansion valve according to claim 1, wherein the valve needle comprises a valve needle tip end section, a main body section and a through section which are sequentially connected along the axial direction of the nut, the valve needle tip end section is matched with the valve port, the main body section is in guiding fit with the nut, the through section is arranged through the through hole, and when the outer surface of the valve needle is provided with a lubricating coating, at least the outer surface of the valve needle tip end section is provided with the lubricating coating.
4. The electronic expansion valve of claim 3, wherein when the outer surface of the valve needle is provided with a lubricating coating, the outer surface of the main body section and/or the through-section is provided with the lubricating coating.
5. The electronic expansion valve according to claim 3, wherein the valve needle further comprises a fixing section, the fixing section is disposed at an end of the penetrating section away from the main body section, the fixing section extends out of an end of the screw rod away from the nut, and the valve needle assembly further comprises a positioning element, and the positioning element is disposed at the fixing section.
6. The electronic expansion valve according to claim 5, wherein the positioning member is a positioning sleeve sleeved on the fixed segment.
7. An electronic expansion valve according to claim 5, wherein an end of the positioning element adjacent to the valve stem is provided with the lubricating coating.
8. An electronic expansion valve according to claim 2, wherein the inner wall of the nut is provided with the lubricating coating.
9. The electronic expansion valve according to claim 8, wherein the nut comprises a metal seat and a nut sleeve, one end of the nut sleeve is disposed toward the valve port, and the metal seat is disposed on an outer peripheral wall of an end of the nut sleeve that faces the valve port and is fixedly connected to an inner wall of the valve housing;
the nut sleeve comprises a thread section and a guide section, the thread section is in threaded connection with the screw, the guide section is in guide fit with the valve needle, and the lubricating coating is arranged on the inner wall of the thread section and/or the inner wall of the guide section.
10. Refrigeration device, comprising an electronic expansion valve according to any of claims 1-9.
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|---|---|---|---|
| CN202111156319.XA CN113685557A (en) | 2021-09-29 | 2021-09-29 | Electronic expansion valve and refrigeration equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111156319.XA CN113685557A (en) | 2021-09-29 | 2021-09-29 | Electronic expansion valve and refrigeration equipment |
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| CN113685557A true CN113685557A (en) | 2021-11-23 |
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| CN202111156319.XA Pending CN113685557A (en) | 2021-09-29 | 2021-09-29 | Electronic expansion valve and refrigeration equipment |
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