CN116464783A - Electronic expansion valve - Google Patents

Electronic expansion valve Download PDF

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Publication number
CN116464783A
CN116464783A CN202310519272.1A CN202310519272A CN116464783A CN 116464783 A CN116464783 A CN 116464783A CN 202310519272 A CN202310519272 A CN 202310519272A CN 116464783 A CN116464783 A CN 116464783A
Authority
CN
China
Prior art keywords
valve needle
sealing
seal
electronic expansion
expansion valve
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.)
Pending
Application number
CN202310519272.1A
Other languages
Chinese (zh)
Inventor
请求不公布姓名
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taizhou Younikang Trading Co ltd
Original Assignee
Taizhou Younikang Trading Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Taizhou Younikang Trading Co ltd filed Critical Taizhou Younikang Trading Co ltd
Priority to CN202310519272.1A priority Critical patent/CN116464783A/en
Publication of CN116464783A publication Critical patent/CN116464783A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/44—Details of seats or valve members of double-seat valves
    • F16K1/443—Details of seats or valve members of double-seat valves the seats being in series
    • 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
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/46—Attachment of sealing rings
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
    • 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
    • F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • 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
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
    • 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)
  • Lift Valve (AREA)

Abstract

The embodiment of the invention provides an electronic expansion valve, and relates to the technical field of valves. The electronic expansion valve includes a housing, a drive assembly, a large valve needle, a small valve needle, and a seal. The casing is provided with inlet, liquid outlet and sealing seat. The big valve needle is provided with the installation through hole along the direction of height on, and is provided with the through hole that corresponds with inlet and liquid outlet, and big valve needle movably installs in the casing. The small valve needle is movably arranged in the mounting through hole. The driving component is arranged in the shell and is in transmission connection with the small valve needle, the driving component can drive the small valve needle to move so as to close or open the liquid passing hole, and the small valve needle can be blocked or communicated between the liquid inlet and the liquid outlet to drive the large valve needle to move. The sealing element is arranged on the large valve needle, the sealing element is abutted with the sealing seat when the large valve needle is in a closed state, and/or the small valve needle is abutted with the sealing element when the small valve needle is in a closed state. Which enables a better sealing.

Description

Electronic expansion valve
Technical Field
The invention relates to the technical field of regulating valves, in particular to an electronic expansion valve.
Background
The electronic expansion valve utilizes the electric signal generated by the adjusted parameters to control the voltage or current applied to the expansion valve, thereby achieving the purpose of adjusting the liquid supply amount. The stepless variable capacity refrigerating system has wide refrigerating liquid supply amount regulating range, fast regulating reaction, and the traditional throttling device, such as a thermal expansion valve, is difficult to be qualified, and the electronic expansion valve can meet the requirement well.
The electronic expansion valve is generally arranged in the refrigerant loop and used for adjusting the flow of the refrigerant in the loop so as to meet different working condition demands, and the electronic expansion valve is divided into three parts: the motor is controlled by the electric control and is driven to the mechanical part to realize the valve opening and closing and flow regulation of the electronic expansion valve.
The double-valve needle electronic expansion valve is provided with two valve needles, has wider adjusting range and can be suitable for a scene needing to be controlled more precisely.
In order to solve the problem of low internal leakage of the existing double-valve needle electronic expansion valve, a complex sealing structure is required to be designed, so that the assembly and manufacturing cost of the electronic expansion valve are increased, and the sealing performance is poor.
Disclosure of Invention
The object of the present invention consists, for example, in providing an electronic expansion valve which allows to reduce the assembly and manufacturing costs of the expansion valve, on the basis of improving the sealing of the electronic expansion valve.
Embodiments of the invention may be implemented as follows:
in a first aspect, the present invention provides an electronic expansion valve comprising a housing, a drive assembly, a large valve needle, a small valve needle, and a seal;
the shell is provided with a liquid inlet, a liquid outlet and a sealing seat;
the large valve needle is provided with an installation through hole along the height direction and a liquid passing hole corresponding to the liquid inlet and the liquid outlet, and is movably installed in the shell;
the small valve needle is movably arranged in the mounting through hole;
the driving component is arranged in the shell and is in transmission connection with the small valve needle, the driving component can drive the small valve needle to move so as to close or open the liquid passing hole to block or communicate between the liquid inlet and the liquid outlet, and the small valve needle can drive the large valve needle to move;
the sealing element is arranged on the large valve needle, when the large valve needle is in a closing state, the sealing element is in abutting connection with the sealing seat, and/or when the small valve needle is in a closing state, the small valve needle is in abutting connection with the sealing element.
In an alternative embodiment, the sealing element is arranged at the bottom end of the large valve needle, and when the large valve needle is in a closed state, the bottom surface of the sealing element is abutted with the sealing seat.
In an alternative embodiment, the sealing element is provided with a sealing hole, and when the small valve needle is in a closed state, the end part of the small valve needle is inserted into the sealing hole and is abutted with the side wall of the sealing hole.
In an alternative embodiment, the sealing aperture is tapered toward the top of the seal; and/or the number of the groups of groups,
the section of one end of the small valve needle, which is close to the sealing seat, is gradually reduced.
In an alternative embodiment, the seal is snapped onto the large valve needle.
In an alternative embodiment, a positioning ring groove is formed in the inner wall of the mounting through hole, and a limiting ring groove is formed in the inner wall of the positioning ring groove;
the outer peripheral wall of the sealing element is provided with a clamping ring table, the sealing element is at least partially assembled in the positioning ring groove, the top wall of the sealing element is attached to the top wall of the positioning ring groove, and the limiting ring groove is assembled in the limiting ring groove.
In an alternative embodiment, the bottom end of the large valve needle is provided with a mounting ring table, and the top wall of the sealing element is concavely provided with an assembly ring groove;
the mounting ring table is assembled in the assembly ring groove.
In an alternative embodiment, a first clamping part is convexly arranged on the outer peripheral wall of the mounting ring table, a first clamping groove is formed in the outer side wall of the assembly ring groove, and the first clamping part is assembled in the first clamping groove; and/or the number of the groups of groups,
the inner Zhou Bitu of the mounting ring table is provided with a second clamping part, the inner side wall of the assembly ring groove is provided with a second clamping groove, and the second clamping part is assembled in the second clamping groove.
In an alternative embodiment, the electronic expansion valve further comprises a first sealing ring, a first sealing ring groove is formed in the outer peripheral wall of the large valve needle, and the first sealing ring is arranged in the first sealing ring groove and is abutted against the inner peripheral wall of the shell; and/or the number of the groups of groups,
the electronic expansion valve further comprises a second sealing ring, a second sealing ring groove is formed in the outer peripheral wall of the small valve needle, and the second sealing ring is arranged in the second sealing ring groove and is abutted to the inner wall of the installation through hole.
In an alternative embodiment, the sealing seat is convexly provided with a sealing ring table, and when the large valve needle is in a closed state, the end part of the sealing piece is abutted with the sealing ring table.
In an alternative embodiment, the sealing element comprises a first sealing element and a second sealing element, the first sealing element is sleeved on the outer side of the second sealing element, and the first sealing element and/or the second sealing element are/is connected with the large valve needle;
when the large valve needle is in a closing state, the first sealing piece is abutted with the sealing seat;
the small valve needle is abutted with the second sealing piece when the small valve needle is in a closing state;
the first sealing element and the second sealing element are made of different materials.
In alternative embodiments, the first seal and the second seal are integrally formed or fixedly connected.
In an alternative embodiment, the sealing element is fixedly connected with the large valve needle by means of bonding or embedding.
In an alternative embodiment, the seal is integrally formed.
The electronic expansion valve provided by the embodiment of the invention has the beneficial effects that:
this application is through setting up the sealing member to install the sealing member at big needle, thereby can utilize a sealing member just can realize sealing between big needle and the sealing seat, also can realize sealing between little needle and the big needle, thereby under the circumstances that improves electron expansion valve body sealing performance, reduce assembly and manufacturing cost. Most importantly, compared with sealing by using two sealing rings, the sealing device has the advantages that one sealing piece is utilized, downward pressure can be applied to the sealing piece through the large valve needle during sealing, and the small valve needle can directly apply pressure to the sealing piece, so that the sealing strength between the sealing piece and the sealing seat can be further improved, and the service life of the sealing piece is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an electronic expansion valve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a cross-sectional structure of an electronic expansion valve according to an embodiment of the present invention;
FIG. 3 is a first embodiment of an assembly of a seal in an electronic expansion valve according to an embodiment of the present invention;
FIG. 4 is a second embodiment of an assembly of a seal in an electronic expansion valve according to an embodiment of the present invention;
FIG. 5 is a third embodiment of an electronic expansion valve seal assembly according to the present invention;
FIG. 6 is a fourth embodiment of an electronic expansion valve seal assembly according to the present invention;
FIG. 7 is a fifth embodiment of an electronic expansion valve seal assembly according to the present invention;
FIG. 8 is a sixth embodiment of an electronic expansion valve according to the present invention;
fig. 9 is a seventh assembly method of a seal member in an electronic expansion valve according to an embodiment of the present invention.
Icon: 100-electronic expansion valve; 110-a housing; 111-a liquid inlet; 113-a liquid outlet; 115-a seal holder; 117-upper shell; 119-middle shell; 121-a lower shell; 123-through holes; 125-positioning ring grooves; 127-limiting ring groove; 129-sealing ring table; 130-a drive assembly; 131-rotor; 133-a spindle; 135-driving a nut; 150-big valve needle; 151-mounting through holes; 152-a liquid passing hole; 153-body; 155-a buckle cover; 157-mounting a ring table; 159-a first clip portion; 161-a second clamping portion; 163-a first seal ring groove; 170-a small valve needle; 171-a second seal ring groove; 190-seal; 191-sealing the hole; 195-clamping a ring table; 197-fitting ring grooves; 199-first clamping grooves; 201-a second clamping groove; 203-a first seal; 205-a second seal; 211-a first spring; 213-washers; 215-a second spring; 217-a first sealing ring; 219-second seal ring.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1 and 2, in order to improve the sealing performance of the electronic expansion valve 100 with double needle and reduce the manufacturing and assembly costs thereof, the present embodiment provides an electronic expansion valve 100. Electronic expansion valve 100 includes housing 110, drive assembly 130, large valve needle 150, small valve needle 170, and seal 190. The housing 110 is provided with a liquid inlet 111, a liquid outlet 113 and a seal holder 115. The large valve needle 150 is provided with a mounting through hole 151 in the height direction, and a liquid passing hole 152 corresponding to the liquid inlet 111 and the liquid outlet 113, and the large valve needle 150 is movably mounted in the housing 110. The small needle 170 is movably disposed in the mounting through hole 151. The driving assembly 130 is installed in the housing 110 and is in driving connection with the small valve needle 170, the driving assembly 130 can drive the small valve needle 170 to move to close or open the liquid passing hole 152, so that the liquid inlet and the liquid outlet 113 can be blocked or communicated, and the small valve needle 170 can drive the large valve needle 150 to move to further open or shrink the flow passage. A seal 190 is provided to the large valve needle 150. The seal 190 abuts the seal seat 115 when the large valve needle 150 is in the closed state. The small valve needle 170 abuts the seal 190 when the small valve needle 170 is in the closed state.
In this embodiment, the sealing member 190 is provided, and the sealing member 190 is installed on the large valve needle 150, so that the sealing between the large valve needle 150 and the sealing seat 115 can be realized by using one sealing member 190, and the sealing between the small valve needle 170 and the large valve needle 150 can be realized, so that the assembly and manufacturing cost can be reduced under the condition of improving the sealing performance of the electronic expansion valve 100. Most importantly, compared with sealing by using two sealing rings, the sealing device utilizes one sealing piece 190, and can apply downward pressure to the sealing piece 190 through the large valve needle 150 firstly and then directly apply pressure to the sealing piece 190 through the small valve needle 170 during sealing, so that the sealing strength between the sealing piece 190 and the sealing seat 115 can be further improved, and the service life of the sealing piece 190 can be prolonged.
Referring to fig. 1 and 2, in the present embodiment, the housing 110 includes an upper case 117, a middle case 119 and a lower case 121, which are sequentially connected, and the specific connection manner may be welding or detachable connection. The upper case 117 is closed at the top end and is open at the bottom end. The middle shell 119 has a cylindrical shape. Through holes 123 are formed in the lower case 121 along the height direction thereof, liquid outlet holes are formed at the bottom ends of the through holes 123, and a plurality of liquid inlet holes are formed in the side walls of the lower case 121. A seal seat 115 is formed in the through hole 123, which is capable of forming a seal with the seal 190.
In the present embodiment, the driving assembly 130 includes a rotor 131, a rotation shaft 133, and a driving nut 135. The rotation shaft 133 is rotatably fitted to the rotor 131, and the rotor 131 is rotatably fitted in the upper case 117. The bottom end of the rotating shaft 133 is provided with threads. The drive nut 135 is movably mounted within the middle housing 119, and the middle housing 119 may limit rotation of the drive nut 135. The end of the rotation shaft 133 is fitted to the drive nut 135. The rotor 131 drives the rotating shaft 133 to rotate, and the rotating shaft 133 drives the driving nut 135 to move.
In this embodiment, a first spring 211 is disposed in the large valve needle 150, one end of the first spring 211 is abutted against the large valve needle 150, the other end is connected with the small valve needle 170, the small valve needle 170 is connected with a driving nut 135, the driving nut 135 moves up and down to drive the small valve needle 170 to move up and down, and the small valve needle 170 moves up and down to drive the large valve needle 150 to move up and down.
Referring to fig. 1 and 2, in the present embodiment, the electronic expansion valve 100 further includes a gasket 213, the gasket 213 is installed in the large valve needle 150, and the small valve needle 170 is provided with a clamping table, the large valve needle 150 is not moved in the initial stage of upward movement of the small valve needle 170, and when the clamping table abuts against the gasket 213, the small valve needle 170 can drive the large valve needle 150 to move upward, so that the medium flow becomes large.
In the present embodiment, the small needle 170 and the driving nut 135 are connected by means of a bolt and a slot, and a second spring 215 is disposed between the small needle 170 and the driving nut 135, and the second spring 215 can flexibly connect the small needle 170 and the driving nut 135.
In the present embodiment, the sealing member 190 is disposed at the bottom end of the large valve needle 150, and when the large valve needle 150 is in the closed state, the bottom surface of the sealing member 190 abuts against the sealing seat 115.
The sealing element 190 is arranged at the bottom end of the large valve needle 150, so that the assembly and sealing effect of the sealing element 190 can be better realized.
Referring to fig. 1 and 2, in the present embodiment, the sealing member 190 is provided with a sealing hole 191, and when the small valve needle 170 is in the closed state, the end of the small valve needle 170 is inserted into the sealing hole 191 and abuts against the side wall of the sealing hole 191.
The provision of the seal bore 191 in the seal 190 facilitates the insertion of the end of the needle 170 to effect a seal. So that simultaneous sealing of the large valve needle 150 and the small valve needle 170 can be better achieved.
In this embodiment, the seal bore 191 is gradually enlarged toward the top of the seal 190. The end of the small valve needle 170 adjacent to the seal seat 115 is tapered in cross section. This arrangement may provide a tapered seal between the needle 170 and the seal 190, thereby further enhancing the sealing effect of the seal 190.
Of course, in other embodiments of the present application, the seal bore 191 may also be cylindrical.
In this embodiment, the sealing element 190 may be any one of a fluororesin such as PTFE, FEP, PFA, ETFE and modified PTFE or any one of a rubber NBR, HNBR, SIL, FKM and EPDM, so as to realize soft-touch and hard sealing between the valve seat and the large valve needle 150 and the small valve needle 170, and effectively solve the problem of low inner leakage tightness of the products of the large valve needle 150 and the small valve needle 170. Referring to fig. 1 and 2, in the present embodiment, the sealing member 190 is clamped to the large valve needle 150. The snap fit arrangement thus facilitates assembly and replacement of the seal 190.
Referring to fig. 3, in some embodiments of the present application, the seal 190 is assembled by:
the inner wall of the installation through hole 151 is provided with a locating ring groove 125, the inner wall of the locating ring groove 125 is provided with a limiting ring groove 127, the outer peripheral wall of the sealing element 190 is provided with a clamping ring table 195, the sealing element 190 is at least partially assembled in the locating ring groove 125, the top wall of the sealing element 190 is attached to the top wall of the locating ring groove 125, and the clamping ring table 195 is assembled in the limiting ring groove 127.
By providing the positioning ring groove 125, the mounting position of the sealing element 190 can be defined by the way that the top wall of the sealing element 190 is abutted against the top wall of the positioning ring groove 125, and the sealing element 190 can be prevented from being forced to cause the sealing element 190 to move upwards during the downward movement of the large valve needle 150. The provision of the mating assembly of the snap ring land 195 and the retention ring groove 127 prevents the seal 190 from exiting the retention ring groove 125 during upward movement of the large valve needle 150.
The forming of the limiting ring groove 127 can be directly processed by a machining mode, but in order to clamp the sealing element 190 in the limiting ring groove 127, the large valve needle 150 is arranged into two parts in the embodiment, the large valve needle comprises a body 153 and a buckle cover 155, the buckle cover 155 is provided with a through hole 123, a limiting table is arranged at the periphery of the through hole 123, the sealing element 190 is installed in the through hole 123, and the bottom wall of the sealing element 190 is abutted with the limiting table. The cover 155 is installed at an end of the body 153 and is connected with an outer circumference of the body 153, a limiting ring groove 127 is formed between the limiting table and the end of the body 153, and the sealing member 190 can be compressed in the limiting ring groove 127 by applying a compressing force to the cover 155.
Specifically, the cover 155 may be integrally formed with the body 153, and of course, the cover 155 may be mounted on an end of the body 153 by a screw thread.
Referring to fig. 4-6, in other embodiments of the present application, the seal 190 is assembled by:
the bottom end of the large valve needle 150 is provided with a mounting ring table 157, the top wall of the sealing element 190 is concavely provided with an assembly ring groove 197, and the mounting ring table 157 is assembled in the assembly ring groove 197. The outer peripheral wall of the mounting ring 157 is provided with a first clamping portion 159, the outer peripheral wall of the assembly ring groove 197 is provided with a first clamping groove 199, and the first clamping portion 159 is assembled in the first clamping groove 199. The inner portion Zhou Bitu of the mounting ring base 157 is provided with a second engaging portion 161, the inner side wall of the fitting ring groove 197 is provided with a second engaging groove 201, and the second engaging portion 161 is fitted into the second engaging groove 201.
In this embodiment, the first engagement portion 159 and the second engagement portion 161 are provided on the mounting land 157, and the first engagement groove 199 and the second engagement groove 201 are provided on the inner and outer sides of the assembly ring groove 197, so that the seal 190 can be prevented from coming off.
The bottom ends of the bottom surfaces of the first clamping portion 159 and the second clamping portion 161 are provided with guide inclined surfaces, so that the first clamping portion 159 and the second clamping portion 161 are clamped in the first clamping groove 199 and the second clamping groove 201 respectively.
The number of the first clamping portions 159 and the second clamping portions 161 can be set according to actual requirements, and only needs to be set at intervals in the height direction.
Referring to fig. 7, of course, in some embodiments of the present application, only the first clamping portion 159 and the first clamping groove 199, or the second clamping portion 161 and the second clamping groove 201 may be provided.
Referring to fig. 8, in other embodiments of the present application, the sealing element 190 may be adhered to the bottom end of the large valve needle 150 by fastening or bonding, and the sealing element 190 may be connected to the large valve needle 150 by embedding.
It should be noted that, the sealing members 190 in the above examples are all integrally formed. This can facilitate installation of the seal 190.
Referring to fig. 9, in other embodiments of the present application, the sealing member 190 includes a first sealing member 203 and a second sealing member 205, the first sealing member 203 is sleeved on the outer side of the second sealing member 205, and the first sealing member 203 and the second sealing member 205 are connected with the large valve needle 150. When the large needle 150 is in the closed state, the first seal 203 abuts the seal seat 115. The small valve needle 170 abuts the second seal 205 when the small valve needle 170 is in the closed state. The first seal 203 and the second seal 205 are made of different materials. In this manner, the seal 190 may be formed integrally with the first seal 203 and the second seal 205. Or the two parts are fixedly connected after being processed separately, such as bonding. Thus, different materials can be selected according to the requirements to meet the different requirements on the deformation amount, hardness and the like of the sealing element 190. It may be that the first sealing member 203 is made of a harder rubber material, the second sealing member 205 is made of a softer rubber material, or the second sealing member 205 is made of a harder material, and the first sealing member 203 is made of a softer material.
With continued reference to fig. 2, in the present embodiment, the sealing seat 115 is provided with a sealing ring table 129, and when the large valve needle 150 is in the closed state, an end of the sealing member 190 abuts against the sealing ring table 129. The sealing ring table 129 is provided with a rounded corner so that a line seal can be formed between the seal 190 and the sealing ring table 129, whereby sealing performance can be enhanced.
In this embodiment, the electronic expansion valve 100 further includes a first seal ring 217, the outer peripheral wall of the large valve needle 150 is provided with a first seal ring groove 163, and the first seal ring 217 is disposed in the first seal ring groove 163 and abuts against the inner peripheral wall of the housing 110, so that the seal between the large valve needle 150 and the housing 110 can be better achieved.
In this embodiment, the electronic expansion valve 100 further includes a second seal ring 219, the outer peripheral wall of the small valve needle 170 is provided with a second seal ring groove 171, and the second seal ring 219 is disposed in the second seal ring groove 171 and abuts against the inner wall of the mounting through hole 151. So that a better seal between the large valve needle 150 and the small valve needle 170 can be achieved.
In this embodiment, the small valve needle 170 is in a hollow structure, so that the lower end of the small valve needle 170 is communicated with the chamber of the switching second spring 215, and in a state where both the large valve needle 150 and the small valve needle 170 are closed, a first cavity, a second cavity and three cavities are formed by enclosing a first sealing ring 217 and a second sealing ring 219, and the first cavity is formed by enclosing the inner wall of the lower shell 121, the sealing member 190, the outer side wall of the small valve needle 170 and the first sealing ring 217 and the second sealing ring 219, and this area is communicated with the liquid inlet 111. The second chamber is defined by the liquid outlet 113, the seal 190 and the interior of the valve needle 170, and the third chamber is defined by the upper regions of the first seal 217 and the second seal 219. When both the large valve needle 150 and the small valve needle 170 are in the fully closed state, the refrigerant in the first cavity cannot enter the second cavity and the third cavity, the hollow arrangement of the small valve needle 170 can enable the second cavity to be communicated with the third cavity, the pressure of the second cavity is the same, internal balance is formed, and when flow regulation is needed, the valve opening force is small, so that the small valve needle 170 is favorably opened and closed.
With continued reference to fig. 2, the movement process of the electronic expansion valve 100 is as follows: the rotor 131 rotates positively, the middle shell 119 limits the rotation of the drive nut 135, the rotor 131 drives the rotating shaft 133 to rotate, the threads of the rotating shaft 133 drive the drive nut 135 to move upwards, the drive nut 135 drives the small valve needle 170 to move upwards, the small valve needle 170 is limited by the gasket after moving upwards for a certain stroke to drive the large valve needle 150 to move upwards, the large valve needle 150 and the small valve needle 170 integrally move upwards, and the maximum stroke is reached after being limited by the middle shell 119, so that the full-opening action is completed. The rotor 131 reversely rotates, the middle shell 119 limits the rotation of the drive nut 135, the rotor 131 drives the rotating shaft 133 to rotate, the threads of the rotating shaft 133 drive the drive nut 135 to downwards move, the drive nut 135 downwards drives the small valve needle 170 to downwards move, the small valve needle 170 downwards presses the compression spring, the compression spring downwards acts on the large valve needle 150, and therefore the large valve needle 150 downwards moves to firstly finish closing a valve, and then the small valve needle 170 downwards moves to finish closing the valve, so that the full closing action is finished.
In summary, the embodiment of the present invention provides the working principle and beneficial effects of the electronic expansion valve 100, including:
in this embodiment, the sealing member 190 is provided, and the sealing member 190 is installed on the large valve needle 150, so that the sealing between the large valve needle 150 and the sealing seat 115 can be realized by using one sealing member 190, and the sealing between the small valve needle 170 and the large valve needle 150 can be realized, so that the assembly and manufacturing cost can be reduced under the condition of improving the sealing performance of the electronic expansion valve 100. Most importantly, compared with sealing by using two sealing rings, the sealing device has the advantages that one sealing piece 190 is utilized, downward pressure can be applied to the sealing piece 190 through the large valve needle 150 at first in sealing, and then pressure can be directly applied to the sealing piece 190 through the small valve needle 170, so that the sealing strength between the sealing piece 190 and the sealing seat 115 can be further improved, and the service life of the sealing piece 190 can be prolonged.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (14)

1. An electronic expansion valve characterized by comprising a housing (110), a drive assembly (130), a large valve needle (150), a small valve needle (170) and a seal (190);
the shell (110) is provided with a liquid inlet (111), a liquid outlet (113) and a sealing seat (115);
the large valve needle (150) is provided with an installation through hole (151) along the height direction and a liquid passing hole (152) corresponding to the liquid inlet (111) and the liquid outlet (113), and the large valve needle (150) is movably installed in the shell (110);
the small valve needle (170) is movably arranged in the mounting through hole (151);
the driving assembly (130) is installed in the shell (110) and is in transmission connection with the small valve needle (170), the driving assembly (130) can drive the small valve needle (170) to move so as to close or open the liquid passing hole (152) to enable the liquid inlet (111) and the liquid outlet (113) to be blocked or communicated, and the small valve needle (170) can drive the large valve needle (150) to move;
the seal (190) is arranged on the large valve needle (150), when the large valve needle (150) is in a closed state, the seal (190) is abutted with the seal seat (115) and/or when the small valve needle (170) is in a closed state, the small valve needle (170) is abutted with the seal (190).
2. The electronic expansion valve according to claim 1, wherein the sealing member (190) is disposed at a bottom end of the large valve needle (150), and a bottom surface of the sealing member (190) abuts against the sealing seat (115) when the large valve needle (150) is in a closed state.
3. The electronic expansion valve according to claim 2, characterized in that the sealing member (190) is provided with a sealing hole (191), and when the small valve needle (170) is in the closed state, the end of the small valve needle (170) is inserted into the sealing hole (191) and abuts against the side wall of the sealing hole (191).
4. An electronic expansion valve according to claim 3, characterized in that the sealing aperture (191) increases gradually towards the top of the seal (190); and/or the number of the groups of groups,
the cross section of one end of the small valve needle (170) close to the sealing seat (115) is gradually reduced.
5. The electronic expansion valve of claim 2, wherein the seal (190) is snap-fit to the large valve needle (150).
6. The electronic expansion valve according to claim 5, wherein a positioning ring groove (125) is provided on an inner wall of the mounting through hole (151), and a limiting ring groove (127) is provided on an inner wall of the positioning ring groove (125);
the outer peripheral wall of the sealing piece (190) is provided with a clamping ring table (195), the sealing piece (190) is at least partially assembled in the positioning ring groove (125), the top wall of the sealing piece (190) is attached to the top wall of the positioning ring groove (125), and the limiting ring groove (127) is assembled in the limiting ring groove (127).
7. The electronic expansion valve according to claim 5, wherein a mounting ring table (157) is arranged at the bottom end of the large valve needle (150), and an assembly ring groove (197) is concavely arranged at the top wall of the sealing element (190);
the mounting ring table (157) is assembled in the assembly ring groove (197).
8. The electronic expansion valve according to claim 7, wherein a first clamping portion (159) is convexly arranged on the outer peripheral wall of the mounting ring table (157), a first clamping groove (199) is arranged on the outer side wall of the assembly ring groove (197), and the first clamping portion (159) is assembled in the first clamping groove (199); and/or the number of the groups of groups,
the inner Zhou Bitu of the mounting ring table (157) is provided with a second clamping part (161), the inner side wall of the assembly ring groove (197) is provided with a second clamping groove (201), and the second clamping part (161) is assembled in the second clamping groove (201).
9. The electronic expansion valve according to claim 1, further comprising a first seal ring (217), wherein a first seal ring groove (163) is provided in an outer peripheral wall of the large valve needle (150), and wherein the first seal ring (217) is provided in the first seal ring groove (163) and abuts against an inner peripheral wall of the housing (110); and/or the number of the groups of groups,
the electronic expansion valve further comprises a second sealing ring (219), a second sealing ring groove (171) is formed in the outer peripheral wall of the small valve needle (170), and the second sealing ring (219) is arranged in the second sealing ring groove (171) and is in butt joint with the inner wall of the installation through hole (151).
10. The electronic expansion valve according to claim 1, wherein the sealing seat (115) is provided with a sealing ring table (129) in a protruding manner, and when the large valve needle (150) is in a closed state, an end portion of the sealing member (190) abuts against the sealing ring table (129).
11. The electronic expansion valve according to claim 2, wherein the sealing member (190) comprises a first sealing member (203) and a second sealing member (205), the first sealing member (203) is sleeved outside the second sealing member (205), and the first sealing member (203) and/or the second sealing member (205) are/is connected with the large valve needle (150);
when the large valve needle (150) is in a closed state, the first sealing piece (203) is abutted with the sealing seat (115);
when the small valve needle (170) is in a closed state, the small valve needle (170) is abutted with the second sealing piece (205);
the first sealing piece (203) and the second sealing piece (205) are made of different materials.
12. The electronic expansion valve of claim 11, wherein the first seal (203) and the second seal (205) are integrally formed or fixedly connected.
13. The electronic expansion valve according to claim 2, characterized in that the sealing element (190) is fixedly connected to the large valve needle (150) by means of adhesion or embedding.
14. The electronic expansion valve of any of claims 1-10, wherein the seal (190) is integrally formed.
CN202310519272.1A 2023-05-06 2023-05-06 Electronic expansion valve Pending CN116464783A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310519272.1A CN116464783A (en) 2023-05-06 2023-05-06 Electronic expansion valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310519272.1A CN116464783A (en) 2023-05-06 2023-05-06 Electronic expansion valve

Publications (1)

Publication Number Publication Date
CN116464783A true CN116464783A (en) 2023-07-21

Family

ID=87184392

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310519272.1A Pending CN116464783A (en) 2023-05-06 2023-05-06 Electronic expansion valve

Country Status (1)

Country Link
CN (1) CN116464783A (en)

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