CN113819249A - Electronic expansion valve and refrigeration equipment - Google Patents
Electronic expansion valve and refrigeration equipment Download PDFInfo
- Publication number
- CN113819249A CN113819249A CN202111157730.9A CN202111157730A CN113819249A CN 113819249 A CN113819249 A CN 113819249A CN 202111157730 A CN202111157730 A CN 202111157730A CN 113819249 A CN113819249 A CN 113819249A
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- valve
- nut sleeve
- electronic expansion
- nut
- cavity
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 239000002184 metal Substances 0.000 claims abstract description 52
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000001746 injection moulding Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009966 trimming Methods 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
- 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
- F16K1/32—Details
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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
Abstract
The invention discloses an electronic expansion valve and refrigeration equipment, wherein the electronic expansion valve comprises a valve shell, a nut and a valve needle assembly, wherein the valve shell is provided with an accommodating cavity and a valve port communicated with the accommodating cavity; the nut is arranged in the accommodating cavity and comprises a nut sleeve and a metal seat, one end of the nut sleeve is arranged towards the valve port, and the metal seat is arranged on the outer peripheral wall of one end of the nut sleeve, which faces the valve port, and is fixedly connected with the inner wall of the valve shell so as to divide the accommodating cavity into a first cavity close to the valve port and a second cavity far away from the valve port; the metal seat and/or the valve shell are/is provided with a balance channel communicated with the first cavity and the second cavity, and the valve needle assembly is in threaded fit with the nut and is inserted into the valve port. The electronic expansion valve can improve the reliability of the valve opening.
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 a conventional electronic expansion valve, one end of a lead screw is connected with a rotor of a permanent magnet stepping motor, the other end of the lead screw is connected with a valve needle, and the lead screw is in threaded connection with a nut so as to transmit the rotation of the stepping motor to the valve needle and enable the valve needle to move along the axial direction of the nut, thereby closing or opening a valve port of the electronic expansion valve. The nut divides the containing cavity of the valve shell into two cavities close to the valve port and far away from the valve port, and the air pressure in the cavity close to the valve port can change along with the closing or opening of the valve port of the electronic expansion valve by the valve needle, so that the action performance of the valve is influenced.
Disclosure of Invention
The invention mainly aims to provide an electronic expansion valve, aiming at improving the action performance of a valve opening pipe valve of the electronic expansion valve.
In order to achieve the above object, the present invention provides an electronic expansion valve comprising:
the valve comprises a valve shell, a valve body and a valve core, wherein the valve shell is provided with a containing cavity and a valve port communicated with the containing cavity; and
the nut is arranged in the accommodating cavity and comprises a nut sleeve and a metal seat, one end of the nut sleeve is arranged towards the valve port, and the metal seat is arranged on the peripheral wall of one end of the nut sleeve, which faces the valve port, and is fixedly connected with the inner wall of the valve shell so as to divide the accommodating cavity into a first cavity body close to the valve port and a second cavity body far away from the valve port; the metal seat and/or the valve shell are/is provided with a balance channel communicated with the first cavity and the second cavity;
the valve needle assembly is in threaded fit with the nut and is inserted into the valve port.
Optionally, the valve needle assembly comprises:
the screw rod is arranged in the nut sleeve in a reciprocating displacement mode between a first position and a second position along the axial direction of the nut sleeve, and the screw rod is in threaded fit with the nut sleeve;
the screw rod is provided with a through hole, the valve needle penetrates through the through hole and the nut sleeve, and the valve needle is in transmission connection with the screw rod;
when the screw rod is driven to rotate and moves from the first position to the second position along the nut sleeve, the valve needle is pushed to move away from the valve port along the axial direction of the nut sleeve so as to gradually open the valve port, and when the screw rod moves from the second position to the first position, the valve needle is pushed to move close to the valve port along the axial direction of the nut sleeve so as to gradually close the valve port.
Optionally, a positioning sleeve abutting against the first end of the screw rod is arranged on the valve needle, and the second end of the screw rod is in transmission connection with the valve needle through an elastic element.
Optionally, the valve housing includes a housing and a valve seat, the valve port is disposed on the valve seat, the housing is connected to an end of the valve seat away from the valve port to form the accommodating cavity, and the metal seat is fixedly connected to an inner wall of the valve seat.
Optionally, the balancing channel is a groove or a through hole or a cut edge provided on an inner peripheral wall of the valve seat or the metal seat.
Optionally, the number of balancing channels is not less than 1.
Optionally, the nut sleeve comprises a threaded section and a guiding section, the threaded section is in threaded connection with the screw, and the guiding section is in guiding fit with the valve needle.
Optionally, the nut sleeve is made of plastic or a part of the nut sleeve is made of plastic, and the metal seat and the nut sleeve are integrally connected through injection molding.
Alternatively, the metal seat may have a first concave-convex portion extending in an axial direction of the nut sleeve, the nut sleeve may have a second concave-convex portion extending in the axial direction of the nut sleeve, a convex portion of the first concave-convex portion may be fitted into a concave portion of the second concave-convex portion, and a convex portion of the second concave-convex portion may be fitted into a concave portion of the first concave-convex portion.
Alternatively, the first concave-convex portion and the second concave-convex portion are respectively provided in a screw shape.
The invention also provides refrigeration equipment comprising the electronic expansion valve.
According to the technical scheme, the balance channel is formed in the inner wall of the metal seat and/or the valve shell to communicate the first cavity and the second cavity, so that the pressure between the first cavity and the second cavity is balanced, the first cavity and the second cavity are prevented from generating resistance pressure difference when the valve needle assembly moves towards the nut to open or close the valve port, and the action performance of the poppet valve is improved.
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 structural sectional view of the nut of fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
211 | |
| 10 | Valve |
212 | |
| 11 | Containing |
213 | Second concave- |
| 111 | The |
221 | First concave- |
| 112 | |
30 | |
| 12 | Valve port | 40 | |
| 13 | |
41 | |
| 20 | |
42 | Valve |
| 21 | |
421 | |
| 22 | |
422 | |
| 423 | Valve needle section | 101 | Outer casing |
| 102 | Valve seat |
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 electronic expansion valve 100 is able to control the refrigerant medium flow in the refrigeration system.
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, and a valve needle assembly 40. The valve housing 10 has a receiving cavity 11 and a valve port 12 communicated with the receiving cavity 11; the nut 20 is installed in the accommodating cavity 11, the nut 20 includes a nut sleeve 21 and a metal seat 22, one end of the nut sleeve 21 is disposed toward the valve port 12, and the metal seat 22 is disposed on an outer peripheral wall of one end of the nut sleeve 21 toward the valve port 12 and is fixedly connected with an inner wall of the valve housing 10, so as to divide the accommodating cavity 11 into a first cavity 111 close to the valve port 12 and a second cavity 112 far away from the valve port 12; the metal seat 22 and/or the valve housing 10 is provided with a balance passage 13 communicating the first cavity 111 and the second cavity 112, and the needle assembly 40 is threadedly engaged with the nut 20 and inserted into the valve port 12.
As shown in fig. 1, a housing chamber 11 is provided in a valve housing 10, a medium inlet and a valve port 12 are provided in the valve housing 10, respectively, the medium inlet being connected to a medium inlet pipe, and the valve port 12 being connected to a medium outlet pipe, the medium inlet being communicated with the housing chamber 11. It is understood that the refrigerant flows from the medium inflow pipe into the accommodating chamber 11, and flows to the medium outflow pipe through the valve port 12 when the valve needle assembly 40 opens the valve port 12. Of course, the refrigerant may also flow in the opposite direction, i.e. the refrigerant flows from the medium outlet pipe into the accommodating cavity 11 through the valve port 12 and flows out from the medium inlet pipe. The nut 20 comprises a nut sleeve 21 and a metal seat 22 fixedly connected with each other, wherein the metal sleeve is sleeved and fixed on the outer peripheral wall of one end of the nut sleeve 21 facing the valve port 12 and divides the accommodating cavity 11 of the valve housing 10 into a first cavity 111 close to the valve port 12 and a second cavity 112 far away from the valve port 12, when the valve needle assembly 40 moves axially towards the nut 20 to open or close the valve port 12, the volume of the first cavity 111 changes, and at the same time, a resistance pressure difference is generated between the first cavity 111 and the second cavity 112.
It can be understood that, by providing the balance passage 13 on the metal seat 22 and the cavity wall of the accommodating cavity 11 to communicate the two areas of the first cavity 111 and the second cavity 112, the pressure balance between the two sides of the metal seat 22 in the axial direction is ensured, and the influence of the uneven pressure of the first cavity 111 and the second cavity 112 on the action performance of the valve needle assembly 40 and further on the performance of the electronic expansion valve 100 is prevented.
The outer wall of the metal seat 22 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 seat 102. In other embodiments, the metal bases 22 may be fixedly connected to each other by snapping or interference fit.
In practical applications, the shape and structure of the balance channel 13 may be determined according to practical situations, such as a cylindrical through hole, a tapered through hole, or a shaped through hole such as an inclined hole, a curved through hole, etc. In the present embodiment, the balance passage 13 is a straight passage extending in the axial direction of the valve housing 10, and is easy to machine and can be directly manufactured by machining.
In one embodiment, the valve housing 10 includes a housing 101 and a valve seat 102, the valve port 12 is disposed on the valve seat 102, an end of the housing 101 connected to the valve seat 102 facing away from the valve port 12 forms a receiving cavity 11, and the metal seat 22 is fixedly connected to an inner peripheral wall of the valve seat 102.
Alternatively, the nut 20 is installed in the valve housing 10, and the nut 30 may be installed on the housing 101, or may be installed on the valve seat 102, or may be installed on both the housing 101 and the valve seat 102, wherein the housing 101 and the valve seat 102 may be in a snap connection, a threaded connection, a plug connection, or the like, which is not limited herein. In practical production, the wall thickness of the housing 101 is generally thin in order to reduce production cost, so that the metal seat 22 is fixedly connected to the inner peripheral wall of the valve seat 102 in this embodiment, so as to improve the structural strength inside the electronic expansion valve 100.
In an embodiment, the balance passage 13 may be disposed on an inner wall of the valve seat 102, and the balance passage 13 may be a notch or a groove structure or a cut edge recessed inward on the inner wall of the valve seat 102, or may be a through hole opened on the inner wall of the valve seat 102, or the like.
In an embodiment, the balance channel 13 may be disposed on the metal seat 22, and the balance channel 13 may be a through hole structure on the metal seat 22, a notch structure or a groove structure formed by recessing an outer wall of the metal seat 22, or a trimming structure, etc., which are not limited herein.
In an embodiment, the balance channel 13 may be formed by the valve housing 10 and the metal seat 22, that is, the inner wall of the valve housing 10 has an indent structure, and correspondingly, the metal seat 22 also has an indent structure adapted to the indent structure on the inner wall of the valve housing 10, and the two indent structure structures form the balance channel 13, so as to communicate the first cavity 111 and the second cavity 112 at this time, thereby ensuring the pressure balance between the first cavity 111 and the second cavity 112, ensuring the pressure balance in the whole electronic expansion valve 100, and enhancing the stability of the electronic expansion valve 100.
It is understood that the shape and implementation manner of the balancing passage 13 in the above embodiments are not limited as long as the balancing passage 13 can communicate the first cavity and the second cavity, and are not limited herein.
Further, the number of the balance channels 13 is not less than 1, that is, the number of the balance channels 13 may be one, or may also be 2, 3, or more. It should be noted that the number of the balance passages 13 may be determined according to practical situations, for example, a plurality of balance passages 13 may be arranged at intervals on the periphery of the metal seat 22 or on the inner wall of the valve seat 102 to achieve a better effect of balancing the air pressure. Optionally, a plurality of equalization channels 13 are evenly spaced around the circumference of the metal seat 22 to achieve a better pressure equalization effect.
In one embodiment, the needle assembly 40 includes a screw rod 41 and a needle 42, the screw rod 41 is reciprocally displaceable along the axial direction of the nut sleeve 21 between a first position and a second position and is disposed in the nut sleeve 21, and the screw rod 41 is threadedly engaged with the nut sleeve 21; the screw rod 41 is provided with a through hole, the valve needle 42 is arranged through the through hole and the nut sleeve 21, and the valve needle 42 is in transmission connection with the screw rod 41; when the screw rod 41 is driven to rotate, when moving along the nut sleeve 21 from the first position to the second position, the valve needle 42 is pushed to move axially away from the valve port 12 along the nut sleeve 21 to gradually open the valve port 12, and when moving from the second position to the first position, the valve needle 42 is pushed to move axially closer to the valve port 12 along the nut sleeve 21 to gradually close the valve port 12.
In this embodiment, the screw rod 41 is provided with an external thread, the nut sleeve 21 has an internal thread, and the external thread of the screw rod 41 is engaged with the internal thread of the nut sleeve 21 to realize thread fit. It should be understood that the screw 41 is driven by the magnetic rotor assembly of the electronic expansion valve 100, that is, the electronic expansion valve 100 further includes the magnetic rotor assembly, the magnetic rotor assembly includes a stator assembly and a rotor assembly, the rotor assembly is fixedly connected to the screw 41, the stator assembly is sleeved on the periphery of the valve housing and is disposed corresponding to the position of the rotor assembly, when the stator assembly is in operation, the rotor assembly is driven to rotate, when the rotor assembly rotates, the screw 41 is driven to rotate, the nut sleeve 21 has an internal thread, and the nut sleeve 21 is fixed, so that the screw 41 can be raised or lowered along the axial direction of the nut sleeve 21.
Further, the screw 41 is provided with a through hole, the valve needle 42 is movably arranged in the through hole and the nut sleeve 21 in a penetrating manner, the valve needle 42 is in transmission connection with the screw 41, the elastic element 30 is arranged between the valve needle 42 and the screw 41, the positioning sleeve is connected to one end of the valve needle 42 departing from the valve port 12, and the positioning sleeve is positioned on one side of the screw 41 departing from the valve port 12. It should be noted that, after the electronic expansion valve 100 is powered on, the rotor assembly rotates along the preset direction to drive the screw rod 41 to rotate, the screw rod 41 is in threaded fit with the nut 20, so that the screw rod 41 moves towards the valve port 12 along the axial direction of the nut 20, the screw rod 41 will press the elastic element 30 to make the valve needle 42 move towards the valve port 12 along the axial direction of the nut 20, so as to close the valve port 12, and when the valve port 12 is closed, the positioning sleeve abuts against the valve housing 10, so as to limit the valve needle 42, and prevent the valve needle 42 from being damaged. The rotor assembly rotates in a direction opposite to the preset direction to drive the screw rod 41 to rotate, so that the screw rod 41 moves in a direction away from the valve port 12 along the axial direction of the nut 20, the screw rod 41 abuts against the positioning sleeve towards one end of the valve port 12, the valve needle 42 moves in the direction away from the valve port 12 along the axial direction of the nut 20, and the valve port 12 is gradually opened to adjust the flow rate of the refrigerant.
It should be noted that the valve needle 42 includes a valve needle section 423 and a valve rod section 422 that are connected in sequence, a diameter of the valve needle section 423 is larger than a diameter of the valve rod section 422, so as to form a positioning shoulder 421 at a connection of the valve needle section 423 and the valve rod section 422, one end of the elastic member 30 abuts against or is connected to the second end of the screw 41, and the other end of the elastic member 30 abuts against the positioning shoulder 421.
Optionally, the valve needle 42 includes a valve rod section 422 and a valve needle section 423 sequentially connected in the axial direction of the valve housing 10 toward the valve port 12, the diameter of the valve needle section 423 is larger than that of the valve rod section 422, so that the connection between them is reduced in steps to form a positioning shoulder 421, and a mounting position of the elastic member 30 is reserved, so that the whole electronic expansion valve 100 is more compact. The elastic member 30 is sleeved on the valve rod section 422, and one end of the elastic member 30 abuts against the positioning shoulder 421, and the other end of the elastic member 30 can abut against the second section of the screw rod 41, or can be directly welded and fixedly connected to the second end of the screw rod 41, so that the elastic member 30 is not easy to loosen. The screw 41 rotates and moves downward to push the elastic member 30 to compress, thereby indirectly providing a downward pushing force to the valve needle 42 for controlling the opening or closing of the valve port 12.
Further, the elastic member 30 is a spring, and the spring is sleeved on the valve rod section 422. Specifically, compare in other types of elastic component such as preforming, or jump ring etc. choose for use the spring when being convenient for the installation, long service life, and even can not take place to damage in long-time compression use for the motion of needle 42 is more nimble.
The nut sleeve 21 comprises a threaded section 211 and a guiding section 212, the threaded section 211 is in threaded connection with the screw rod 41, and the guiding section 212 is in guiding fit with the valve needle 42.
In one embodiment, as shown in fig. 1 and 2, the nut sleeve 21 is cylindrical, the nut sleeve 21 has a through hole extending along an axial direction thereof, the through hole has a threaded section 211 and a guide section 212, the threaded section 211 is disposed along the axial direction of the valve housing 10 and is directed toward the valve port 12, the threaded rod 41 is in threaded connection with the threaded section 211, the guide section 212 is in guiding fit with the valve needle 42, and an end of the nut sleeve 21 facing the valve port 12 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 42 penetrating through the through hole and the valve port 12. Optionally, the material of the connecting seat and the nut sleeve 21 may be the same or different.
The nut sleeve 21 is made of plastic or part of the plastic, and the metal seat 22 and the nut sleeve 21 are integrally connected through injection molding. It can be understood that the friction between metals is larger than the friction between metals and non-metals, the screw rod 41 is made of metals, if the nut sleeve 21 is made of metals, the problem that the screw rod 41 and the nut 20 are stuck due to unsmooth screw-thread fit between the screw rod 41 and the nut 20 is likely to occur, and friction powder is generated between the metals during long-term use, so that the valve needle 42 is easily stuck, and therefore the nut sleeve 21 needs to be made of plastic materials, or at least a part of the nut sleeve 21 is made of plastic materials. In order to ensure smooth thread fit between the screw 41 and the nut 20, it is preferable that at least the threaded section 211 of the nut sleeve 21 is made of injection molding material to reduce the friction between the screw 41 and the nut sleeve 21, so as to improve the lubrication between the screw 41 and the nut 20 and prevent the needle 42 from being stuck. Specifically, the metal seat 22 and the nut sleeve 21 are integrally formed, so that the connection strength between the metal seat 22 and the nut sleeve 21 can be ensured.
As shown in fig. 2, the metal seat 22 has a first concave-convex portion 221 extending in the axial direction of the nut sleeve 21, the nut sleeve 21 has a second concave-convex portion 213 extending in the axial direction of the nut sleeve 21, a convex portion of the first concave-convex portion 221 is fitted into a concave portion of the second concave-convex portion 213, and a convex portion of the second concave-convex portion 213 is fitted into a concave portion of the first concave-convex portion 221.
Alternatively, as shown in fig. 2, the convex portion of the first concave-convex portion 221 protrudes in the radial direction of the metal seat 22, the concave portion of the first concave-convex portion 221 is recessed in the radial direction of the metal seat 22, the convex portion of the second concave-convex portion 213 protrudes in the radial direction of the nut sleeve 21, the concave portion of the second concave-convex portion 213 is recessed in the radial direction of the nut sleeve 21, and the first concave-convex portion 221 and the second concave-convex portion 213 are embedded into each other to limit the degree of freedom of the nut sleeve 21 and the metal seat 22 in the axial direction of the nut 20, so that the nut sleeve 21 and the metal seat 22 do not generate relative displacement in the axial direction of the nut 20, thereby improving the connection strength of the nut sleeve 21 and the metal seat 22.
Further, as shown in fig. 2, the first concave-convex portion 221 and the second concave-convex portion 213 are respectively provided in a screw shape. Specifically, the first concave-convex portion 221 and the second concave-convex portion 213 are screwed, so that the nut case 21 and the metal base 22 are easily attached and detached.
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 (11)
1. An electronic expansion valve, comprising:
the valve comprises a valve shell, a valve body and a valve core, wherein the valve shell is provided with a containing cavity and a valve port communicated with the containing cavity; and
the nut is arranged in the accommodating cavity and comprises a nut sleeve and a metal seat, one end of the nut sleeve is arranged towards the valve port, and the metal seat is arranged on the peripheral wall of one end of the nut sleeve, which faces the valve port, and is fixedly connected with the inner wall of the valve shell so as to divide the accommodating cavity into a first cavity body close to the valve port and a second cavity body far away from the valve port; the metal seat and/or the valve shell are/is provided with a balance channel communicated with the first cavity and the second cavity;
and the valve needle assembly is in threaded fit with the nut and is inserted into the valve port.
2. The electronic expansion valve of claim 1, wherein the valve needle assembly comprises:
the screw rod is arranged in the nut sleeve in a reciprocating displacement mode between a first position and a second position along the axial direction of the nut sleeve, and the screw rod is in threaded fit with the nut sleeve;
the screw rod is provided with a through hole, the valve needle penetrates through the through hole and the nut sleeve, and the valve needle is in transmission connection with the screw rod;
when the screw rod is driven to rotate and moves from the first position to the second position along the nut sleeve, the valve needle is pushed to move away from the valve port along the axial direction of the nut sleeve so as to gradually open the valve port, and when the screw rod moves from the second position to the first position, the valve needle is pushed to move close to the valve port along the axial direction of the nut sleeve so as to gradually close the valve port.
3. The electronic expansion valve according to claim 1, wherein the balance passage is a straight passage provided extending in an axial direction of the valve housing.
4. The electronic expansion valve according to claim 1, wherein the valve housing comprises a housing and a valve seat, the valve port is disposed on the valve seat, the housing is connected to an end of the valve seat facing away from the valve port to form the accommodating chamber, and the metal seat is fixedly connected to an inner peripheral wall of the valve seat.
5. The electronic expansion valve according to claim 4, wherein the balancing passage is a groove or a through hole or a cut-out provided in an inner circumferential wall of the valve seat or the metal seat.
6. The electronic expansion valve of claim 1, wherein the number of balancing passages is not less than 1.
7. The electronic expansion valve of claim 2, wherein the nut sleeve comprises a threaded section and a guide section, the threaded section being in threaded connection with the threaded rod, the guide section being in guiding engagement with the valve needle.
8. The electronic expansion valve according to claim 1, wherein the nut sleeve is made of plastic or a part of the nut sleeve is made of plastic, and the metal seat and the nut sleeve are integrally connected by injection molding.
9. The electronic expansion valve according to claim 1, wherein the metal seat has a first concave-convex portion extending in an axial direction of the nut sleeve, the nut sleeve has a second concave-convex portion extending in the axial direction of the nut sleeve, a convex portion of the first concave-convex portion is fitted into a concave portion of the second concave-convex portion, and a convex portion of the second concave-convex portion is fitted into a concave portion of the first concave-convex portion.
10. The electronic expansion valve according to claim 9, wherein the first concave-convex portion and the second concave-convex portion are each provided in a screw shape.
11. A refrigeration device comprising an electronic expansion valve according to any of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111157730.9A CN113819249A (en) | 2021-09-29 | 2021-09-29 | Electronic expansion valve and refrigeration equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111157730.9A CN113819249A (en) | 2021-09-29 | 2021-09-29 | Electronic expansion valve and refrigeration equipment |
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| CN113819249A true CN113819249A (en) | 2021-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111157730.9A Pending CN113819249A (en) | 2021-09-29 | 2021-09-29 | Electronic expansion valve and refrigeration equipment |
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