CN116816948A - Electronic expansion valve and refrigeration equipment - Google Patents

Electronic expansion valve and refrigeration equipment Download PDF

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Publication number
CN116816948A
CN116816948A CN202310912546.3A CN202310912546A CN116816948A CN 116816948 A CN116816948 A CN 116816948A CN 202310912546 A CN202310912546 A CN 202310912546A CN 116816948 A CN116816948 A CN 116816948A
Authority
CN
China
Prior art keywords
valve
section
thread section
difference
internal thread
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
CN202310912546.3A
Other languages
Chinese (zh)
Inventor
陈超
杨茂
黄龙华
刘振超
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.)
Guangdong Welling Motor Manufacturing Co Ltd
Original Assignee
Guangdong Welling Motor Manufacturing 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 Guangdong Welling Motor Manufacturing Co Ltd filed Critical Guangdong Welling Motor Manufacturing Co Ltd
Priority to CN202310912546.3A priority Critical patent/CN116816948A/en
Publication of CN116816948A publication Critical patent/CN116816948A/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
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F16K1/38—Valve members of conical shape
    • 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
    • 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
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
    • 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
    • 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)
  • Lift Valve (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

The application discloses an electronic expansion valve and a refrigeration device, wherein the electronic expansion valve comprises: the valve housing comprises a valve seat and a housing, the housing and the valve seat are mutually matched to form a hollow cavity, the valve seat is provided with a valve port, and the valve port is communicated with the valve cavity; the nut is arranged in the valve shell, an internal thread section and a first through hole section are formed in the nut, and the nut is in interference fit with the inner wall surface of the valve seat; the valve rod is arranged through the nut, one end of the valve rod is provided with a valve needle for adjusting the opening degree of the valve port, and the valve rod is provided with an external thread section which is at least partially in threaded connection with the internal thread section and a first cylindrical section which is at least partially inserted into the first through hole section; wherein the fit clearance between the first cylindrical section and the first through hole section is smaller than the minimum fit clearance between the external thread section and the internal thread section. The application can ensure that the external thread section and the internal thread section can keep a preset assembly space and prevent the external thread section and the internal thread section from being blocked.

Description

Electronic expansion valve and refrigeration equipment
The application is a divisional application with the application number of 202110759224.0, and the application date of the main application is as follows: 2021, 07, 05; the application is named as follows: an electronic expansion valve and a refrigeration device.
Technical Field
The application relates to the field of household appliances, in particular to an electronic expansion valve and refrigeration equipment.
Background
The electronic expansion valve is widely applied to refrigeration equipment such as refrigerators, air conditioners and the like. The electronic expansion valve is provided with a nut and a screw, wherein the position of the nut is relatively fixed, a valve rod is arranged on the nut in a threaded mode, and axial movement of the valve rod is achieved by rotating the valve rod. In order to realize the aperture control to the valve port, in the existing electronic expansion valve, a valve needle is arranged at the valve port, the valve needle is connected with a valve rod through structures such as an elastic piece, and the like, and the valve needle is pushed to move through the valve rod, so that the position of the valve needle is regulated, and the aperture of the valve port is regulated by changing the positions of the valve needle and the valve port. Because the valve rod needs to be in a movable state, in the existing electronic expansion valve, the valve rod is easy to be blocked with the nut, and the position adjustment of the valve needle is affected.
Disclosure of Invention
The application mainly aims to provide an electronic expansion valve and refrigeration equipment, and aims to solve the problem that the existing electronic expansion valve is easy to be blocked in the use process.
In order to achieve the above object, the present application provides an electronic expansion valve, comprising:
the valve housing comprises a valve seat and a housing, the housing and the valve seat are mutually matched to form a hollow cavity, the valve seat is provided with a valve port, and the valve port is communicated with the valve cavity;
the nut is arranged in the valve shell, an internal thread section and a first through hole section are formed in the nut, and the nut is in interference fit with the inner wall surface of the valve seat; and
the valve rod is arranged through the nut, one end of the valve rod is provided with a valve needle for adjusting the opening of the valve port, and the valve rod is provided with an external thread section which is at least partially in threaded connection with the internal thread section and a first cylindrical section which is at least partially inserted into the first through hole section;
wherein a fit clearance between the first cylindrical section and the first through hole section is smaller than a minimum fit clearance between the external thread section and the internal thread section.
Optionally, the difference between the inner diameter of the first through hole section and the outer diameter of the first cylindrical section is a first difference; the difference value between the root diameter of the internal thread section and the crest diameter of the external thread section is a second difference value, and the difference value between the root diameter of the external thread section and the crest diameter of the internal thread section is a third difference value;
wherein the first difference is less than the second difference and the first difference is less than the third difference.
Optionally, the valve stem further has a second cylindrical section, the externally threaded section being located between the first cylindrical section and the second cylindrical section; the nut is also provided with a second through hole section, and the second cylindrical section is at least partially inserted into the second through hole section;
the fit clearance between the second cylindrical section and the second through hole section is smaller than the minimum fit clearance between the external thread section and the internal thread section.
Optionally, the difference between the inner diameter of the second through hole section and the outer diameter of the second cylindrical section is a fourth difference; the difference value between the root diameter of the internal thread section and the crest diameter of the external thread section is a second difference value, and the difference value between the root diameter of the external thread section and the crest diameter of the internal thread section is a third difference value;
wherein the fourth difference is less than the second difference and the fourth difference is less than the third difference.
Optionally, the fit clearance between the second cylindrical section and the second through hole section is greater than the fit clearance between the first cylindrical section and the first through hole section.
Optionally, the inner diameters of the first through hole section, the internal thread section and the second through hole section decrease in sequence.
Optionally, the valve stem is integrally provided with the valve needle.
Optionally, the electronic expansion valve further includes:
the driving assembly is arranged on the valve shell, the valve rod is integrally provided with a top end far away from the valve needle, and the top end of the valve rod is connected with the driving assembly so that the driving assembly drives the valve rod to axially move.
Optionally, the driving assembly includes:
the rotor module is rotatably arranged on the valve shell; and
and the limiting plate is arranged on the rotor module, and the top end of the valve rod is connected with the limiting plate.
Optionally, the driving assembly further comprises:
the limiting rod is arranged on the limiting plate; and
the slip ring is connected with the limit rod;
the outer wall of the nut is provided with a guide rail, and the sliding ring is in sliding fit with the sliding rail.
The application also proposes a refrigeration device comprising an electronic expansion valve as described in any of the preceding claims.
According to the technical scheme, the first cylindrical section is matched with the first through hole section, so that the valve rod is limited; through making the fit clearance of first cylinder section and first through-hole section be less than the fit clearance of external screw thread section and internal screw thread section, can play spacing effect to the valve rod for external screw thread section and internal screw thread section can keep preset assembly space, prevent that the card from appearing in external screw thread section and internal screw thread section and die.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in 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 application;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic view of an embodiment of a nut of the present application;
FIG. 4 is a schematic illustration of the structure of an embodiment of a valve stem of the present application;
FIG. 5 is a schematic view of an embodiment of a valve seat according to the present application;
FIG. 6 is a schematic view showing the fitting of the valve seat and the nut according to an embodiment of the present application;
FIG. 7 is a schematic view of an embodiment of the nut and stem engaged condition of the present application;
FIG. 8 is a schematic diagram of an embodiment of a valve stem and drive assembly according to the present application.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present application, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
The application provides an electronic expansion valve which can be used for refrigerating or heating equipment such as a refrigerator, an air conditioner, a heat pump water heater and the like and is used for controlling the flow of a refrigerating medium in a refrigerating system. For convenience of description, the refrigerator will be described by taking the refrigeration apparatus as an example. Fig. 1 to 8 are drawings corresponding to embodiments of the present application.
Referring to fig. 1 and 2, in one embodiment, the electronic expansion valve includes:
a valve housing 10, wherein the valve housing 10 is provided with a valve cavity and a valve port 15 communicated with the valve cavity; the valve housing 10 is formed therein with a valve chamber for accommodating a fluid. The valve housing 10 may include a valve seat 11 and a housing 12, the housing 12 and the valve seat 11 cooperate to form a hollow chamber, and the valve port 15 communicates with the valve cavity for refrigerant to flow into or out of the valve cavity.
A nut 20 installed in the valve housing 10, the nut 20 having an internal thread section 22 and a first through hole section 21 formed therein; the nut 20 and the valve housing 10 are connected and fixed to each other, the nut 20 is provided with a through hole, a part of the through hole is provided with a threaded surface, the internal thread section 22 is formed, and a part of the through hole is a unthreaded hole, so that the first through hole section 21 is formed. The valve chamber may be defined by the side of the nut 20 facing the valve port 15 and the inner wall of the valve housing 10.
A valve rod 30 disposed through the nut 20, wherein a valve needle 31 for adjusting the opening degree of the valve port 15 is disposed at one end of the valve rod 30, the valve rod 30 has an external thread section 34 at least partially screwed with the internal thread section 22, and a first cylindrical section 33 at least partially inserted into the first through hole section 21; the valve rod 30 is partially threaded to form the external thread section 34, and is partially smooth to form the first cylindrical section 33, the external thread section 34 can be connected with the internal thread section 22 of the nut 20 in a threaded manner, and the first cylindrical section 33 can be inserted into the first through hole section 21, so that the nut 20 can play a limiting role on the valve rod 30.
Referring to fig. 3 and 4, the fit clearance between the first cylindrical section 33 and the first through hole section 21 is smaller than the minimum fit clearance between the male thread section 34 and the female thread section 22.
The first cylindrical section 33 is matched with the first through hole section 21, the first through hole section 21 can be mutually limited with the first cylindrical section 33, and when the external thread section 34 is mutually matched with the internal thread section 22, a gap exists between threads of the external thread section 34 and the internal thread section 22, so that the valve rod 30 can axially move from the inside of the nut 20. When the difference between the inner diameter D3 of the first through hole section 21 and the outer diameter D3 of the first cylindrical section 33 is a first difference, the first difference corresponds to the fit clearance between the first through hole section 21 and the first cylindrical section 33, and the fit clearance between the first through hole section 21 and the first cylindrical section 33 is smaller than the fit clearance between the external thread section 34 and the internal thread section 22, the coaxiality between the first through hole section 21 and the first cylindrical section 33 is higher, and further, the external thread section 34 and the internal thread section 22 can be in threaded fit according to a preset mode, so that the seizure caused by the deflection of the external thread section 34 and the internal thread section 22 is avoided. Because the relative positions of the valve rod 30 and the nut 20 are limited by the first cylindrical section 33 and the first through hole section 21, the fit clearance between the external thread section 34 and the internal thread section 22 can be increased according to the requirement, so that the friction resistance is not too large due to too small fit clearance, and further the screw thread is prevented from being blocked.
The valve rod 30 is inserted through a through hole in the nut 20, wherein one end of the valve rod 30 can protrude from the nut 20 to form the valve needle 31, and when the valve rod 30 moves axially, the valve needle 31 moves synchronously, so that the valve needle 31 can be inserted into the valve port 15. When the valve needle 31 is inserted into the valve port 15 to close the valve port 15, the refrigerant cannot enter or flow out of the valve cavity of the electronic expansion valve, at this time, the opening degree of the valve port 15 is minimum, and when the valve needle 31 is completely removed from the valve port 15, the opening degree of the valve port 15 is maximum. Adjusting the opening of the valve port 15 is achieved by adjusting the depth to which the valve needle 31 is partially inserted into the valve port 15.
In one embodiment, the valve needle 31 is integrally provided with the valve stem 30 such that the valve needle 31 can move synchronously when the valve stem 30 moves in the axial direction. By moving the valve needle 31 and the valve rod 30 synchronously, the position of the valve needle 31 can be precisely adjusted by controlling the stroke of the valve rod 30, thereby realizing precise adjustment of the opening of the valve port 15. Because the first cylindrical section 33 of the valve rod 30 and the first through hole section 21 of the nut 20 can be mutually limited, and the external thread section 34 of the valve rod 30 and the internal thread section 22 of the nut 20 can be mutually limited, when the valve rod 30 is controlled, the valve needle 31 can synchronously displace, and the moving track of the valve needle 31 does not need to be limited on one side of the valve needle 31, so that the design of the nut 20 and the valve needle 31 can be simplified. Because the fit clearance between the first cylindrical section 33 and the first through hole section 21 is smaller than the fit clearance between the external thread section 34 and the internal thread section 22, the moving track of the valve rod 30 is not easy to deviate in the moving process of the valve rod 30, and meanwhile, the moving track of the valve needle 31 can be accurately controlled due to the fact that the valve needle 31 and the valve rod 30 are integrally arranged, and when the opening of the valve port 15 is regulated through the valve needle 31, accurate regulation can be realized.
When the valve needle 31 adjusts the opening of the valve port 15, the valve needle 31 is partially blocked in the valve port 15, and when the refrigerant enters the valve cavity in the operation process of the electronic expansion valve, the valve needle 31 is impacted, so that the valve needle 31 is easy to vibrate. Because the fit clearance between the first cylindrical section 33 and the first through hole section 21 is smaller than the fit clearance between the external thread section 34 and the internal thread section 22, the fit clearance between the valve rod 30 and the nut 20 is reduced, which can help to improve the stability of the valve rod 30, so as to avoid the vibration generated when the valve needle 31 is impacted by the refrigerant, and further reduce the vibration noise generated by the valve rod 30.
In this embodiment, the first cylindrical section 33 is a portion of the valve stem 30 having a cylindrical surface of a polish rod, and the externally threaded section 34 is a portion of the valve stem 30 having a threaded surface. In manufacturing the valve stem 30, the valve needle 31 may be formed at one end of the valve stem 30, and the external thread section 34 is disposed between the first cylindrical section 33 and the valve needle 31. The distribution of the first through hole section 21 and the internal thread section 22 on the nut 20 is matched with the valve rod 30.
Referring to fig. 5, the electronic expansion valve may further include other functional components, where the valve housing 10 may be provided with a first pipe body 13 and a second pipe body 14, the first pipe body 13 is communicated with the valve cavity through the valve port 15, and the first pipe body 13 may be coaxially disposed with the valve seat 11. The second tube 14 communicates with the valve chamber from the side wall of the valve housing 10. One of the first pipe body 13 and the second pipe body 14 serves as an input pipe, and the other serves as an output pipe. The first pipe body 13 and the second pipe body 14 may be connected to the valve seat 11. The housing 12 is connected to the end of the valve seat 11 remote from the first tubular body 13 to form a cavity for mounting the nut 20 and the valve stem 30.
Referring to fig. 6, for example, when the stem 30 is disposed coaxially with the needle 31, the nut 20 is fixed to the valve seat 11 so that the through hole of the nut 20 can be coaxial with the valve port 15 when the electronic expansion valve is mounted. The nut 20 can be in interference fit with the inner wall surface of the valve seat 11, and the nut 20 and the valve seat 11 can be connected and fixed with each other through other connecting pieces.
Referring to fig. 7, the valve rod 30 is disposed through the through hole of the nut 20 so that the valve needle 31 of the valve rod 30 can be inserted into the valve port 15, and by adjusting the position of the valve rod 30, the depth of the valve needle 31 inserted into the valve port 15 can be adjusted, thereby adjusting the opening of the valve port 15.
Referring to fig. 1, after the valve stem 30 is positioned, the housing 12 and the valve seat 11 are connected and fixed to each other to form a valve housing 10 structure.
In one embodiment, the difference between the inner diameter of the first through hole section 21 and the outer diameter of the first cylindrical section 33 is a first difference; the crest of the external thread section 34 is matched with the root of the internal thread section 22, and the difference value between the root diameter of the internal thread section 22 and the crest diameter of the external thread section 34 is a second difference value; the crest of the internal thread segment 22 is matched with the root of the external thread segment 34, and the difference value between the root diameter of the external thread segment 34 and the crest diameter of the internal thread segment 22 is a third difference value; wherein the first difference is less than the second difference and the first difference is less than the third difference.
The first difference is smaller than the smaller one of the second difference and the third difference, so that the first cylindrical section 33 is matched with the first through hole section 21, and therefore, when the valve rod 30 is matched with the nut 20, the fit clearance between the crest of the external thread section 34 and the root of the internal thread section 22 can be properly increased, so that the problem of friction clamping caused by too small fit clearance between the two can be avoided. At the same time, the fit clearance between the root of the external thread segment 34 and the crest of the internal thread segment 22 may be increased to reduce frictional damage between the root of the external thread segment 34 and the root of the internal thread segment 22 while galling may be avoided.
Because the first difference is smaller than the second difference and the third difference, the thread fit between the external thread section 34 and the internal thread section 22 can maintain a preset state no matter the crest of the external thread section 34 is matched with the root of the internal thread section 22 or the root of the external thread section 34 is matched with the crest of the internal thread section 22, so that the crest and the root are prevented from being deviated, the crest and the root are kept in a stable fit clearance, and the problem of locking is further prevented.
With continued reference to fig. 3 and 4, in one embodiment, the valve stem 30 further has a second cylindrical section 35; the nut 20 further has a second through hole section 23, and the second cylindrical section 35 is at least partially inserted into the second through hole section 23; the second cylindrical section 35 and the second through hole section 23 are mutually adapted, so that the second through hole section 23 can limit the second cylindrical section 35. The external thread section 34 is located between the first cylindrical section 33 and the second cylindrical section 35, and the valve needle 31 may be located at a side of the second cylindrical section 35 remote from the external thread section 34. The fit clearance between the second cylindrical section 35 and the second through hole section 23 is smaller than the minimum fit clearance between the male screw section 34 and the female screw section 22, so that the valve stem 30 can be inserted into the through hole of the nut 20 in a predetermined direction.
The valve rod 30 has a first end and a second end which are oppositely arranged, and the first end is sequentially provided with a first cylindrical section 33, an external thread section 34, a second cylindrical section 35 and a valve needle 31 from the first end to the second end, and the outer diameters of the first cylindrical section 33, the external thread section 34, the second cylindrical section 35 and the valve needle 31 are sequentially decreased, namely, D3 > D2 > D1. The through hole of the nut 20 is sequentially provided with a first through hole section 21, an internal thread section 22 and a second through hole section 23, and the internal diameters of the first through hole section 21, the internal thread section 22 and the second through hole section 23 are sequentially decreased, that is, d3 > d2 > d1, so as to limit the maximum movement range of the valve rod 30, and further limit the maximum depth of the valve needle 31 inserted into the valve port 15.
The fit clearance between the second through hole section 23 and the second cylindrical section 35 is smaller than the fit clearance between the internal thread section 22 and the external thread section 34, so that the second cylindrical section 35 and the second through hole section 23 limit the relative offset of the valve rod 30, and the valve rod 30 is not easy to deflect when moving along the axial direction thereof. When the fit clearance between the second through hole section 23 and the second cylindrical section 35 is smaller than the fit clearance between the external thread section 34 and the internal thread section 22, the coaxiality between the second through hole section 23 and the second cylindrical section 35 is higher, so that the external thread section 34 and the internal thread section 22 can be in threaded fit in a preset mode, and the clamping caused by deflection of the external thread section 34 and the internal thread section 22 is avoided. Since the relative positions of the valve rod 30 and the nut 20 are limited by the second cylindrical section 35 and the second through hole section 23, the fit clearance between the external thread section 34 and the internal thread section 22 can be increased as required, and further the two are not easy to be blocked due to overlarge friction resistance caused by overlarge fit clearance.
Because the external thread section 34 is disposed between the first cylindrical section 33 and the second cylindrical section 35, the first cylindrical section 33, the first through hole section 21, the second cylindrical section 35 and the second through hole section 23 limit the valve rod 30 at two ends of the external thread section 34, so that the external thread section 34 of the valve rod 30 and the internal thread section 22 of the nut 20 have larger fit clearance, and further, the screw thread is prevented from being blocked.
The first cylindrical section 33, the first through hole section 21, the second cylindrical section 35 and the second through hole section 23 are respectively used for limiting the valve rod 30 at two ends of the valve rod 30, so that the matching state between the external thread section 34 and the internal thread section 22 is relatively constant, deflection is not easy to occur, the valve needle 31 and the valve rod 30 are integrally arranged, the moving track of the valve needle 31 is relatively constant, and when the valve needle is matched with the valve port 15, the opening degree adjusting precision control of the valve port 15 is more stable.
Optionally, the difference between the inner diameter of the second through hole section 23 and the outer diameter of the second cylindrical section 35 is a fourth difference; the difference between the root diameter of the internal thread section 22 and the crest diameter of the external thread section 34 is a second difference, and the difference between the root diameter of the external thread section 34 and the crest diameter of the internal thread section 22 is a third difference; the fourth difference is smaller than the smaller one of the second difference and the third difference, so that the second cylindrical section 35 is matched with the second through hole section 23, and the fit clearance between the crest of the external thread section 34 and the root of the internal thread section 22 can be increased while the valve rod 30 and the nut 20 are mutually matched, so that the problem of friction locking caused by too small fit clearance between the two is avoided. At the same time, the fit clearance between the root of the external thread segment 34 and the crest of the internal thread segment 22 may be increased to reduce frictional damage between the root of the external thread segment 34 and the root of the internal thread segment 22 while galling may be avoided. Because the fourth difference is smaller than the second difference and the third difference, the thread fit between the external thread section 34 and the internal thread section 22 can maintain a preset state, whether the crest of the thread of the external thread section 34 is matched with the crest of the thread of the internal thread section 22 or the crest of the thread of the external thread section 34 is matched with the crest of the thread of the internal thread section 22, so that the corresponding crests and roots are prevented from being deviated, the corresponding crests and roots maintain a stable fit clearance, and further the problem of seizure is prevented.
Because the first difference is smaller than the smaller one of the second difference and the third difference, the first cylindrical section 33 and the first through hole section 21 cooperate to play a role in limiting the external thread section 34 at one end of the external thread section 34, which is close to the first cylindrical section 33. The fourth difference is smaller than the smaller one of the second difference and the third difference, so that the second cylindrical section 35 and the second through hole section 23 can be matched, the effect of limiting the external thread section 34 can be achieved at one end of the external thread section 34, which is close to the second cylindrical section 35, and further the state of the external thread section 34 is limited from the two ends of the external thread section 34, so that the threads of the external thread section 34 and the threads of the internal thread section 22 of the nut 20 keep a preset fit clearance, the matching of the crests and the bottoms of the teeth is prevented from being deviated, and further the thread blocking can be prevented.
Optionally, the fit clearance between the second cylindrical section 35 and the second through hole section 23 is larger than the fit clearance between the first cylindrical section 33 and the first through hole section 21, so as to reduce friction force when the valve rod 30 is inserted into the nut 20, and improve convenience in mounting the valve rod 30. Since the fourth difference is smaller than the smaller one of the second difference and the third difference, when the fit clearance between the second cylindrical section 35 and the second through hole section 23 is larger than the fit clearance between the first cylindrical section 33 and the first through hole section 21, the moving resistance when the valve stem 30 moves relative to the nut 20 is smaller, and a stable coaxial state can be maintained.
Referring to fig. 1 and 6, in an embodiment, the electronic expansion valve further includes a driving assembly disposed on the valve housing 10, the valve stem 30 is integrally disposed with a top end 32 remote from the valve needle 31, and the top end 32 of the valve stem 30 is connected to the driving assembly, so that the driving assembly drives the valve stem 30 to move axially. The side of the nut 20 facing away from the valve port 15 may form a cavity for mounting the driving assembly, where the driving assembly is used to drive the valve rod 30 to rotate relatively, and when the valve rod 30 rotates relatively, the valve rod 30 can move axially along the nut 20 due to the threaded connection between the valve rod 30 and the nut 20. The driving assembly is used for adjusting the position of the valve rod 30, so as to adjust the depth of the valve needle 31 inserted into the valve port 15, and further adjust the opening of the valve port 15.
In one embodiment, an alternative implementation of the drive assembly is disclosed, the drive assembly comprising:
a rotor module 40 rotatably provided to the valve housing 10; the rotor module 40 is rotatably provided to the valve housing 10, and the rotor module 40 may be rotatably provided to the housing 12. The rotor module 40 is capable of relative rotation after being driven in a manner known in the art.
And a limiting plate 41 disposed on the rotor module 40, wherein the top end 32 of the valve rod 30 is connected with the limiting plate 41. When the rotor module 40 rotates, the rotor module 40 drives the limiting plate 41 to synchronously rotate, and the limiting rod 43 drives the top end 32 of the valve rod 30 to rotate. The top end 32 of the valve rod 30 is integrally arranged with the valve rod 30, and when the top end 32 of the valve rod 30 rotates, the valve rod 30 is driven to integrally rotate, so that the position of the valve rod 30 is adjusted.
Further optionally, the driving assembly further includes:
a limit lever 43 provided on the limit plate 41; one end of the limiting rod 43 is connected to the limiting plate 41, and the other end extends away from the limiting plate 41.
A slip ring 44 connected to the limit lever 43; the slip ring 44 is connected to the limit lever 43 to move in synchronization with the limit lever 43. The outer wall of the nut 20 is provided with a guide rail, and the slip ring 44 is in sliding fit with the slide rail 24. When the rotation module rotates relatively, the limiting plate 41 drives the limiting rod 43 to rotate synchronously, and the slip ring 44 slides along the sliding rail 24 formed on the outer wall of the nut 20, so as to limit the rotation track of the valve rod 30 and improve the stability of the rotation process of the valve rod 30.
The application also provides an embodiment of the refrigeration equipment.
The refrigeration device includes an electronic expansion valve as in any of the embodiments above. The electronic expansion valve is used for controlling the flow of the refrigerant of the refrigeration equipment. When the electronic expansion valve operates, the first cylindrical section 33 is matched with the first through hole section 21, so that the assembly precision of the valve rod 30 and the nut 20 can be improved, the valve rod 30 is prevented from deflecting, the control precision of the valve needle 31 can be improved, the flow of the refrigerant can be adjusted according to the preset precision by the valve needle 31, and the control precision of the refrigeration equipment is improved. After the valve rod 30 is mutually matched with the nut 20, the fit clearance between the external thread section of the valve rod 30 and the internal thread section of the nut 20 can be relatively increased, so that the valve rod 30 is prevented from being blocked while the relative movement of the valve rod 30 is limited.
The foregoing description is only of the optional embodiments of the present application, and is not intended to limit the scope of the application, and all the equivalent structural changes made by the description of the present application and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the application.

Claims (11)

1. An electronic expansion valve, comprising:
the valve housing comprises a valve seat and a housing, the housing and the valve seat are mutually matched to form a hollow cavity, the valve seat is provided with a valve port, and the valve port is communicated with the valve cavity;
the nut is arranged in the valve shell, an internal thread section and a first through hole section are formed in the nut, and the nut is in interference fit with the inner wall surface of the valve seat; and
the valve rod is arranged through the nut, one end of the valve rod is provided with a valve needle for adjusting the opening of the valve port, and the valve rod is provided with an external thread section which is at least partially in threaded connection with the internal thread section and a first cylindrical section which is at least partially inserted into the first through hole section;
wherein a fit clearance between the first cylindrical section and the first through hole section is smaller than a minimum fit clearance between the external thread section and the internal thread section.
2. The electronic expansion valve of claim 1, wherein the difference between the inner diameter of the first bore section and the outer diameter of the first cylindrical section is a first difference; the difference value between the root diameter of the internal thread section and the crest diameter of the external thread section is a second difference value, and the difference value between the root diameter of the external thread section and the crest diameter of the internal thread section is a third difference value;
wherein the first difference is less than the second difference and the first difference is less than the third difference.
3. The electronic expansion valve of claim 1, wherein said valve stem further has a second cylindrical section, said externally threaded section being located between said first cylindrical section and said second cylindrical section; the nut is also provided with a second through hole section, and the second cylindrical section is at least partially inserted into the second through hole section;
the fit clearance between the second cylindrical section and the second through hole section is smaller than the minimum fit clearance between the external thread section and the internal thread section.
4. The electronic expansion valve of claim 3, wherein the difference between the inner diameter of said second through bore section and the outer diameter of said second cylindrical section is a fourth difference; the difference value between the root diameter of the internal thread section and the crest diameter of the external thread section is a second difference value, and the difference value between the root diameter of the external thread section and the crest diameter of the internal thread section is a third difference value;
wherein the fourth difference is less than the second difference and the fourth difference is less than the third difference.
5. The electronic expansion valve of claim 3, wherein a fit gap between the second cylindrical section and the second through bore section is greater than a fit gap between the first cylindrical section and the first through bore section.
6. The electronic expansion valve of claim 3, wherein the first bore section, the internal thread section, and the second bore section have successively decreasing inner diameters.
7. The electronic expansion valve of claim 1, wherein the stem is integrally disposed with the valve needle.
8. The electronic expansion valve of any of claims 1 to 7, further comprising:
the driving assembly is arranged on the valve shell, the valve rod is integrally provided with a top end far away from the valve needle, and the top end of the valve rod is connected with the driving assembly so that the driving assembly drives the valve rod to axially move.
9. The electronic expansion valve of claim 8, wherein said drive assembly comprises:
the rotor module is rotatably arranged on the valve shell; and
and the limiting plate is arranged on the rotor module, and the top end of the valve rod is connected with the limiting plate.
10. The electronic expansion valve of claim 9, wherein said drive assembly further comprises:
the limiting rod is arranged on the limiting plate; and
the slip ring is connected with the limit rod;
the outer wall of the nut is provided with a guide rail, and the sliding ring is in sliding fit with the sliding rail.
11. A refrigeration device comprising an electronic expansion valve according to any one of claims 1 to 10.
CN202310912546.3A 2021-07-05 2021-07-05 Electronic expansion valve and refrigeration equipment Pending CN116816948A (en)

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CN202310912546.3A Pending CN116816948A (en) 2021-07-05 2021-07-05 Electronic expansion valve and refrigeration equipment
CN202110759224.0A Active CN113551048B (en) 2021-07-05 2021-07-05 Electronic expansion valve and refrigeration equipment
CN202310913715.5A Pending CN116816949A (en) 2021-07-05 2021-07-05 Electronic expansion valve and refrigeration equipment
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GB2124034B (en) * 1982-06-28 1986-09-10 Imp Clevite Inc Solenoid valve
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JP4714626B2 (en) * 2006-04-13 2011-06-29 株式会社不二工機 Control valve for variable displacement compressor
JP5077688B2 (en) * 2008-05-19 2012-11-21 株式会社ジェイテクト Fluid supply valve assembly device
JP6552457B2 (en) * 2016-06-22 2019-07-31 株式会社鷺宮製作所 Motorized valve
JP6691064B2 (en) * 2017-01-25 2020-04-28 株式会社鷺宮製作所 Motorized valve and refrigeration cycle system
JP6722230B2 (en) * 2018-06-20 2020-07-15 株式会社鷺宮製作所 Motorized valve
CN112901790B (en) * 2019-11-19 2022-05-10 浙江盾安禾田金属有限公司 Electronic expansion valve
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CN116816952A (en) 2023-09-29
CN116816950A (en) 2023-09-29
CN113551048A (en) 2021-10-26
CN113551048B (en) 2023-09-26
CN116816949A (en) 2023-09-29

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