CN109458464B - Electronic expansion valve - Google Patents
Electronic expansion valve Download PDFInfo
- Publication number
- CN109458464B CN109458464B CN201811389329.6A CN201811389329A CN109458464B CN 109458464 B CN109458464 B CN 109458464B CN 201811389329 A CN201811389329 A CN 201811389329A CN 109458464 B CN109458464 B CN 109458464B
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- Prior art keywords
- valve
- electronic expansion
- port
- seat
- valve port
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- 238000007789 sealing Methods 0.000 claims abstract description 14
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 210000002445 nipple Anatomy 0.000 claims 4
- 238000009434 installation Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 claims 1
- 238000005299 abrasion Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—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
- F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Lift Valve (AREA)
Abstract
The invention provides an electronic expansion valve, relates to the field of expansion valves, and solves the technical problem that in the prior art, when in a closed state, friction force between threads of a threaded rod and nuts is increased, and abrasion of the threads is improved. The electronic expansion valve includes a valve seat and a valve stem assembly, wherein: the valve seat is internally provided with a valve port, the valve rod assembly is movably arranged in the valve port in a penetrating manner along the axial direction of the valve seat, and the valve rod assembly can be in sealing fit with the valve port so that the valve rod assembly still can continuously move into the valve port under the drive of the magnetic rotor assembly of the electronic expansion valve when the valve port is in a closed state. The invention is used for prolonging the service life of the electronic expansion valve.
Description
Technical Field
The invention relates to the technical field of expansion valves, in particular to an electronic expansion valve.
Background
The electronic expansion valve controls the rotation of the magnet and the valve rod assembly by applying pulse current to the coil part, and the valve needle of the valve rod assembly advances and retreats relative to the valve port under the screw feeding action of the valve rod assembly and the nut, so as to control the flow rate of fluid passing through the valve port.
Currently, the sealing of the fully closed state of the electronic expansion valve is realized by the linear sealing of the valve needle extrusion valve port. As shown in fig. 1 and 2, the valve rod assembly mainly comprises a threaded rod 1, a valve needle body 2, a steel ball 3, a spring 4 and other auxiliary parts, and the valve port 5 of the electronic expansion valve in the prior art mainly adopts stainless steel materials. After pulse current is introduced into a coil of the electronic expansion valve, the magnetic rotor 12 rotates, the magnetic rotor 12 is matched with an external thread of the threaded rod 1 and an internal thread of the nut 13, and the rotation of the magnetic rotor 12 is converted into vertical linear motion of the threaded rod 1, so that the valve needle body 2 is driven to move relative to the valve port 5, the head of the valve needle body 2 is in a conical design, the flow rate of refrigerant passing through the valve port is regulated, when a valve rod assembly of the electronic expansion valve axially moves in the direction of closing the valve port 5, the valve needle body 1 of the valve rod assembly is contacted with the valve port 5 below, and the threaded rod 1 starts to generate axial pressure on the valve needle body 2.
The applicant found that the prior art has at least the following technical problems:
with further closure of the valve stem assembly, the threaded rod 1 compresses the spring 4, thereby generating axial pressure against the valve needle body 2. When the electronic expansion valve is in the fully closed state, the compression amount of the spring 4 is maximum, and the axial pressure of the spring 4 to the valve needle body 2 enables the valve needle body 2 to press the valve port 5, so that the linear seal of the valve port 5 is realized. At this time, the spring 4 generates a reverse elastic force to the threaded rod 1, and the friction between the external thread of the threaded rod 1 and the internal thread of the nut 13 becomes large. The state is the state that the clamping stagnation is most easy to occur, and meanwhile, the abrasion of threads can be improved due to the fact that the friction force between the threads of the threaded rod 1 and the threaded nut 13 is increased, and the service life of the electronic expansion valve is shortened. If the outlet end pressure is greater than the inlet end pressure, and when the pressure difference is greater than the spring force, the valve needle body 2 is pushed open, losing the sealing effect. In addition, the valve rod assembly of the structure comprises a plurality of parts, and has a plurality of assembly procedures and high cost.
Disclosure of Invention
The invention aims to provide an electronic expansion valve, which solves the technical problem that in the prior art, when the threaded rod and a nut are in a closed state, the abrasion of the threads can be improved due to the fact that the friction force of the threads between the threaded rod and the nut is increased. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides an electronic expansion valve, which comprises a valve seat and a valve rod assembly, wherein: the valve seat is internally provided with a valve port, the valve rod assembly is movably arranged in the valve port in a penetrating manner along the axial direction of the valve seat, and the valve rod assembly can be in sealing fit with the valve port so that the valve rod assembly still can continuously move into the valve port under the drive of the magnetic rotor assembly of the electronic expansion valve when the valve port is in a closed state.
Preferably, the valve rod assembly comprises a valve rod and a valve needle connected with the valve rod, wherein the valve needle comprises a linear part and a conical part, the conical part is connected with the linear part, the linear part is connected with the valve rod, and the linear part is in sealing fit with the valve port.
Preferably, the straight portion is in interference fit with the valve port.
Preferably, the valve rod comprises a threaded rod and a valve rod body, the threaded rod is connected with the magnetic rotor assembly of the electronic expansion valve, one end of the valve rod body is fixedly connected or integrally connected with the threaded rod, and the other end of the valve rod body extends along the axial direction of the valve rod body to form the valve needle.
Preferably, the valve rod and the valve needle are of an integrated structure.
Preferably, the valve port is made of polytetrafluoroethylene material.
Preferably, the electronic expansion valve further comprises a shell, a part section of the valve seat is arranged in the shell, and a valve port is arranged in one end, extending out of the shell, of the valve seat; the magnetic rotor assembly is positioned in the shell, the first end of the valve rod assembly is connected with the magnetic rotor assembly, and the second end of the valve rod assembly is matched with the valve port to change the flow rate of the refrigerant flowing through the valve port.
Preferably, the magnetic rotor assembly comprises a magnetic rotor, wherein the magnetic rotor is arranged in the shell and is connected with one end of the threaded rod far away from the valve rod body, a part section of the threaded rod is in threaded connection with a nut in the shell, and the nut is in interference fit with the valve seat.
Preferably, an axial through hole is formed in the nut, an internal thread is arranged in the axial through hole, an external thread is arranged on the threaded rod, and the threaded rod is positioned in the axial through hole and is in threaded connection with the nut.
Preferably, the valve seat is provided with a supporting part for supporting the housing and the supporting part is fixedly connected with the housing.
Preferably, the electronic expansion valve further comprises an L-shaped connecting pipe and an I-shaped connecting pipe, and the L-shaped connecting pipe and the I-shaped connecting pipe are connected to the valve seat to form a refrigerant circulation loop.
Preferably, a through groove penetrating along the axial direction is formed on the valve seat, a matched bearing seat is inserted into the through groove, an axial through hole is formed in the bearing seat, a mounting groove is formed at the lower end of the axial through hole, a valve port is arranged in the mounting groove, a radial side through hole is formed in the middle position of the bearing seat, a ring groove corresponding to the radial side through hole is formed in the middle of the through groove of the valve seat, a side hole communicated with the through groove is formed in the outer wall of the valve seat, and the side hole is connected with the L-shaped connecting pipe.
Preferably, the number of the radial side through holes on the bearing seat is at least two, and the radial side through holes are uniformly distributed along the circumferential direction of the bearing seat.
The electronic expansion valve comprises the valve seat and the valve rod assembly, wherein the valve seat is internally provided with the valve port, the valve rod assembly is movably arranged in the valve port in a penetrating manner along the axial direction of the valve seat, the valve rod assembly can be in sealing fit with the valve port so that the valve rod assembly can still continuously move inwards of the valve port under the drive of the magnetic rotor assembly of the electronic expansion valve when the valve port is in a closed state, compared with the prior art, the axial stress of the valve rod assembly when the valve port is in the closed state is reduced, the friction force between the valve rod assembly and threads between nuts is reduced, and the service life of the electronic expansion valve is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the invention 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, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other 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 a prior art electronic expansion valve;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present invention;
FIG. 4 is an enlarged view of portion B of FIG. 3;
FIG. 5 is a perspective cross-sectional view of a valve seat, bearing seat and valve port assembly provided by an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a valve seat provided by an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a bearing housing provided by an embodiment of the present invention;
FIG. 8 is a cross-sectional view of a nut provided by an embodiment of the present invention;
FIG. 9 is a cross-sectional view of a valve stem assembly provided by an embodiment of the present invention.
Reference numerals: 1. a threaded rod; 2. a valve needle body; 3. steel balls; 4. a spring; 5. a valve port; 6. a housing; 7. a valve seat; 71. a side hole; 8. a ring groove; 9. a coil; 10. a valve stem body; 11. a valve needle; 111. a straight line portion; 112. a first taper; 113. a second taper; 12. a magnetic rotor; 13. a nut; 131. an internal thread; 14. a top shaft; 15. a first spring; 16. a positioning pin; 17. a second spring; 18. a support part; 19. an L-shaped connecting pipe; 20. an 'I' -shaped connecting pipe; 21. a bearing seat; 211. radial side through holes; 212. a mounting groove; 22. an inlet end; 23. an outlet end.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Referring to fig. 3 to 4, the present invention provides an electronic expansion valve comprising a valve seat 7 and a valve stem assembly, wherein: the valve seat 7 is internally provided with a valve port 5, the valve rod assembly is movably arranged in the valve port 5 in a penetrating manner along the axial direction of the valve seat 7, and the valve rod assembly can be in sealing fit with the valve port 5 so that the valve rod assembly still can continuously move into the valve port 5 under the drive of the magnetic rotor 12 assembly of the electronic expansion valve when the valve port 5 is in a closed state and the valve port 5 is in the closed state. The electronic expansion valve controls the flow of the refrigerant flowing through the valve port 5 by controlling the gap between the valve rod assembly and the valve port 5, and for the electronic expansion valve, the valve rod assembly and the valve port are separated in most strokes of the valve rod assembly and have no interaction force, but when the valve rod assembly and the valve port 5 are closed, the effect of the electronic expansion valve provided by the invention is reflected, and at the moment, the valve rod assembly can still move into the valve port 5 after being contacted with the valve port 5, and the moving distance is correspondingly designed according to the valve opening pulse of the electronic expansion valve. Compared with the prior art, the invention reduces the axial stress of the valve rod assembly when the valve port 5 is in the closed state by adopting different sealing methods, thereby reducing the friction between the threads of the valve rod assembly and the nut 13 and prolonging the service life of the electronic expansion valve. Wherein, the valve port 5 is made of sealing material, preferably wear-resistant polytetrafluoroethylene material with low friction coefficient.
Specifically, as shown in fig. 9, the valve rod assembly comprises a valve rod and a valve needle 11 connected with the valve rod, wherein the valve rod comprises a threaded rod 1 and a valve rod body 10, the threaded rod 1 is connected with a magnetic rotor assembly of the electronic expansion valve, one end of the valve rod body 10 is fixedly connected or integrally connected with the threaded rod 1, and the other end of the valve rod body 10 extends along the axial direction of the valve needle 11. The valve needle 11 comprises a straight portion 111 and a conical portion, the conical portion is connected with the straight portion 111, the straight portion 111 is connected with the valve rod, the straight portion 111 is in sealing fit with the valve port 5, and preferably, the straight portion 111 is in interference fit with the valve port 5.
As an alternative implementation manner of the embodiment of the present invention, the taper portion includes a first taper portion 112 and a second taper portion 113, the first taper portion 112 connects the straight portion 111 and the second taper portion 113, and a first taper angle α of the first taper portion 112 is smaller than a second taper angle β of the second taper portion 113, so as to facilitate adjustment of a flow rate of the electronic expansion valve, wherein the first taper angle α may be between 1 ° and 5 °, the second taper angle β is between 35 ° and 90 °, and a design that the second taper angle β of the second taper portion 113 is larger than the first taper angle α of the first taper portion 112 may satisfy control of the flow rate of the electronic expansion valve in a larger range.
As an alternative implementation of the embodiment of the invention, the valve rod assembly comprises a valve rod and a valve needle 11 connected with the valve rod, and the valve rod and the valve needle 11 are of an integral structure. As shown in fig. 1, the valve rod assembly of the electronic expansion valve in the prior art mainly comprises a threaded rod 1, a valve needle body 2, steel balls 3, a spring 4 and other auxiliary parts, the valve rod assembly of the prior art comprises a plurality of parts, the assembly process is more, the cost is higher, and the valve rod assembly of the present invention omits the design of the steel balls 3 and the spring 4, and the structure is simpler.
The electronic expansion valve further comprises a shell 6, a part of section of a valve seat 7 is arranged in the shell 6, and a valve port 5 is arranged in one end, extending out of the shell 6, of the valve seat 7; the magnetic rotor assembly is positioned in the shell 6, the first end of the valve rod assembly is connected with the magnetic rotor assembly, and the second end of the valve rod assembly is matched with the valve port 5 to change the refrigerant flow of the valve port 5. The electronic expansion valve further comprises an L-shaped connecting pipe 19 and an I-shaped connecting pipe 20, and the L-shaped connecting pipe 19 and the I-shaped connecting pipe 20 are connected to the valve seat 7 to form a refrigerant circulation loop together.
The magnetic rotor assembly of the electronic expansion valve provided by the embodiment of the invention comprises a magnetic rotor 12, wherein the magnetic rotor 12 is arranged in a shell 6 and is connected with one end, far away from a rod body, of a threaded rod 1; the nut 13 is in threaded connection with the threaded rod 1, and the nut 13 is in interference fit with the valve seat 7. Specifically, as shown in fig. 8, an axial through hole is formed in the nut 13, an internal thread 131 is formed in the axial through hole, an external thread is formed on the threaded rod 1, and the threaded rod 1 is located in the axial through hole and is in threaded connection with the nut 13.
As shown in fig. 5 to 9, the valve port 5 is connected with the valve seat 7 through a bearing seat 21, specifically, a through groove penetrating along the axial direction is formed on the valve seat 7, the matched bearing seat 21 is inserted into the through groove, an axial through hole is formed in the bearing seat 21, a mounting groove 212 is arranged at the lower end of the axial through hole, the valve port 5 is arranged in the mounting groove 212, a radial side through hole 211 is arranged at the middle position of the bearing seat 21, a ring groove 8 corresponding to the position of the side through hole is arranged in the middle of the through groove of the valve seat 7, a side hole 71 communicated with the through groove is arranged on the outer wall of the valve seat 7, and the side hole 71 is connected with an L-shaped connecting pipe 19. Wherein, the number of the radial side through holes 211 on the bearing seat 21 is at least two, and the radial side through holes 211 are uniformly distributed along the circumferential direction of the bearing seat 21.
That is, one end of the threaded rod 1 is connected with the magnetic rotor 12, the valve needle 11 is matched with the valve port 5 to change the refrigerant flow of the valve port 5, the valve rod assembly is provided with a first position for closing the valve port 5 and enabling the L-shaped connecting pipe 19 and the I-shaped connecting pipe 20 not to be communicated and a second position for enabling the valve port 5 to be communicated and enabling the L-shaped connecting pipe 19 and the I-shaped connecting pipe 20 to be communicated, after the coil 9 of the electronic expansion valve is electrified with pulse current, the magnetic rotor 12 in the shell 6 is driven to rotate, the magnetic rotor 12 is matched with the internal thread 131 of the nut 13 through the external thread of the threaded rod 1 to convert the rotation of the magnetic rotor 12 into the up-down motion of the threaded rod 1, the threaded rod 1 is connected with the valve rod body 10, the valve rod body 10 is connected with the valve needle 11, the threaded rod 1 can enable the valve needle 11 to be driven to move between the first position and the second position relative to the valve port 5 through the valve rod body 10, and the head of the valve needle 11 is in a straight line part 111 and a cone part design for adjusting the refrigerant flow through the valve port 5, as shown in fig. 4, when the valve needle 11 is located at the first position, the valve needle 5 is closed, the valve port 5 is not communicated with the L-shaped connecting pipe 19 is not communicated with the I-shaped connecting pipe; when the valve needle 11 is in the second position, the valve needle 11 can enable the valve port 5 to be in a circulation state (that is to say, the L-shaped connecting pipe 19 is communicated with the I-shaped connecting pipe 20), refrigerant can pass through the valve port 5, and when the valve needle 11 is in a position of completely avoiding the valve port 5, the flow rate of the electronic expansion valve is maximum. The situation in which the valve needle 11 is in the position fully clear of the valve opening 5 is also what we said to be a second position. When the linear portion 111 of the needle 11 comes into contact with the valve port 5, the valve opening point of the electronic expansion valve (the critical point of the flow rate and the non-flow rate in the valve port 5 is the valve opening point), and the magnetic rotor 12 is rotated in the valve closing direction by a certain angle corresponding to the valve opening pulse number, and the position is the operation lower limit position of the electronic expansion valve, namely the full closing position. At this time, the straight line section of the valve needle 11 is in contact with the inner hole of the valve port 5, so that sealing is realized. When the linear part 111 of the valve needle 11 is in contact with the valve port 5, the valve needle 11 continues to move towards the closing direction, and at the moment, the axial stress is only the friction force between the valve needle 11 and the valve port 5, so that compared with the existing structure, the axial stress of the valve rod assembly is small, the friction force between threads is reduced, and the service life is prolonged. In addition, the valve needle 11 is jacked up and the sealing fails when the pressure difference between the outlet end 23 and the inlet end 22 is too large, and in addition, the force is relatively small due to the good lubricity of the polytetrafluoroethylene and the low friction coefficient.
In addition, the electronic expansion valve further comprises a stop assembly, wherein the stop assembly comprises: a top shaft 14 connected to the top wall of the housing 6; the first spring 15 is sleeved on the top shaft 14; the positioning pin 16 is L-shaped and comprises a vertical section and a horizontal section, and the horizontal section is fixedly connected to the valve rod assembly; the second spring 17 is sleeved on the top shaft 14, the positioning pin 16 is driven by the rotation of the valve rod assembly to stir the second spring 17, so that the second spring 17 rotates in the spiral track of the first spring 15 and is converted into up-and-down motion, and when the second spring 17 moves to the upper limit and the lower limit of the first spring 15, the second spring is blocked and stops moving, thereby preventing the valve rod assembly from continuing to rotate and achieving the effect of controlling the movement stroke of the valve rod assembly. The setting of the stop component limits the maximum displacement of the threaded rod 1, and prevents the threaded rod 1 from moving downwards until the valve rod body contacts with the valve port 5 and then presses the valve port 5. The valve seat 7 is provided with a supporting part 18 for supporting the housing 6, and the supporting part 18 is fixedly connected with the housing 6 by welding.
The foregoing is merely illustrative embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention should be covered. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (12)
1. An electronic expansion valve, characterized by comprising a valve seat (7) and a valve stem assembly, wherein: a valve port (5) is arranged in the valve seat (7), the valve rod assembly is movably arranged in the valve port (5) in a penetrating manner along the axial direction of the valve seat (7), the valve rod assembly can be in sealing fit with the valve port (5) so that the valve port (5) is in a closed state, and when the valve port (5) is in the closed state, the valve rod assembly can still move into the valve port (5) continuously under the drive of a magnetic rotor assembly of the electronic expansion valve;
the valve stem assembly comprises a valve stem and a valve needle (11) connected to the valve stem, wherein: the valve needle (11) comprises a linear part (111), and the linear part (111) is in sealing fit with the valve port (5);
the valve seat is characterized in that a through groove penetrating along the axial direction is formed in the valve seat (7), a matched bearing seat (21) is inserted into the through groove, an axial through hole is formed in the bearing seat (21), an installation groove (212) is formed in the lower end of the axial through hole, the valve port (5) is arranged in the installation groove (212), a radial side through hole (211) is formed in the middle position of the bearing seat (21), an annular groove (8) corresponding to the radial side through hole (211) is formed in the middle of the through groove of the valve seat (7), and a side hole (71) communicated with the through groove is formed in the outer wall of the valve seat (7).
2. An electronic expansion valve according to claim 1, characterized in that the valve needle (11) further comprises a conical portion, which conical portion is connected to the straight portion (111), which straight portion (111) is connected to the valve stem.
3. An electronic expansion valve according to claim 2, characterized in that the rectilinear portion (111) is interference-fitted with the valve port (5).
4. An electronic expansion valve according to claim 2, characterized in that the valve stem comprises a threaded rod (1) and a valve stem body (10), the threaded rod (1) is connected with a magnetic rotor assembly of the electronic expansion valve, one end of the valve stem body (10) is fixedly connected or integrally connected with the threaded rod (1), and the other end of the valve stem body (10) extends along the axial direction thereof to form the valve needle (11).
5. Electronic expansion valve according to claim 2, characterized in that the stem is of unitary construction with the valve needle (11).
6. An electronic expansion valve according to claim 1, characterized in that the valve port (5) is made of polytetrafluoroethylene.
7. The electronic expansion valve according to claim 4, further comprising a housing (6), wherein a partial section of the valve seat (7) is arranged in the housing (6), and wherein a valve port (5) is arranged in an end of the valve seat (7) extending out of the housing (6); the magnetic rotor assembly is positioned in the shell (6), the first end of the valve rod assembly is connected with the magnetic rotor assembly, and the second end of the valve rod assembly is matched with the valve port (5) to change the flow rate of the refrigerant flowing through the valve port (5).
8. Electronic expansion valve according to claim 7, characterized in that the magnetic rotor assembly comprises a magnetic rotor (12), wherein the magnetic rotor (12) is arranged in the housing (6) and is connected to an end of the threaded rod (1) remote from the valve stem body (10), a partial section of the threaded rod (1) being in threaded connection with a nut (13) in the housing (6), the nut (13) being in interference fit with the valve seat (7).
9. Electronic expansion valve according to claim 8, characterized in that an axial through hole is provided in the nut (13), an internal thread (131) is provided in the axial through hole, an external thread is provided on the threaded rod (1), and the threaded rod (1) is located in the axial through hole and is in threaded connection with the nut (13).
10. Electronic expansion valve according to claim 7, characterized in that the valve seat (7) is provided with a support part (18) supporting the housing (6) and the support part (18) is fixedly connected with the housing (6).
11. Electronic expansion valve according to claim 1, characterized in that it further comprises an "L" shaped nipple (19) and an "I" shaped nipple (20), both said "L" shaped nipple (19) and said "I" shaped nipple (20) being connected to said valve seat (7) forming a circulation circuit for the refrigerant.
12. The electronic expansion valve according to claim 1, wherein the number of the radial side through holes (211) on the bearing housing (21) is at least two, and the radial side through holes (211) are uniformly distributed along the circumferential direction of the bearing housing (21).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811389329.6A CN109458464B (en) | 2018-11-20 | 2018-11-20 | Electronic expansion valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811389329.6A CN109458464B (en) | 2018-11-20 | 2018-11-20 | Electronic expansion valve |
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| CN109458464A CN109458464A (en) | 2019-03-12 |
| CN109458464B true CN109458464B (en) | 2024-03-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102020129285A1 (en) * | 2019-12-04 | 2021-06-10 | ECO Holding 1 GmbH | Expansion valve |
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|---|---|---|---|---|
| CN102889410A (en) * | 2012-06-29 | 2013-01-23 | 浙江盾安人工环境股份有限公司 | Electronic expansion valve |
| CN103968620A (en) * | 2013-01-28 | 2014-08-06 | 珠海格力电器股份有限公司 | Electronic expansion valve and refrigerating device with same |
| CN104930241A (en) * | 2014-03-19 | 2015-09-23 | 浙江三花股份有限公司 | Electronic expansion valve |
| WO2015143844A1 (en) * | 2014-03-25 | 2015-10-01 | 浙江三花股份有限公司 | Electronic expansion valve |
| CN105972233A (en) * | 2016-07-20 | 2016-09-28 | 珠海格力电器股份有限公司 | Expansion valve, refrigerant circulation system and air conditioner |
| CN209370495U (en) * | 2018-11-20 | 2019-09-10 | 珠海励高精工制造有限公司 | Electric expansion valve |
-
2018
- 2018-11-20 CN CN201811389329.6A patent/CN109458464B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889410A (en) * | 2012-06-29 | 2013-01-23 | 浙江盾安人工环境股份有限公司 | Electronic expansion valve |
| CN103968620A (en) * | 2013-01-28 | 2014-08-06 | 珠海格力电器股份有限公司 | Electronic expansion valve and refrigerating device with same |
| CN104930241A (en) * | 2014-03-19 | 2015-09-23 | 浙江三花股份有限公司 | Electronic expansion valve |
| WO2015143844A1 (en) * | 2014-03-25 | 2015-10-01 | 浙江三花股份有限公司 | Electronic expansion valve |
| CN105972233A (en) * | 2016-07-20 | 2016-09-28 | 珠海格力电器股份有限公司 | Expansion valve, refrigerant circulation system and air conditioner |
| CN209370495U (en) * | 2018-11-20 | 2019-09-10 | 珠海励高精工制造有限公司 | Electric expansion valve |
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| CN109458464A (en) | 2019-03-12 |
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