CN107559433B - Dehumidification electronic expansion valve of air conditioning system - Google Patents
Dehumidification electronic expansion valve of air conditioning system Download PDFInfo
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- CN107559433B CN107559433B CN201610498256.9A CN201610498256A CN107559433B CN 107559433 B CN107559433 B CN 107559433B CN 201610498256 A CN201610498256 A CN 201610498256A CN 107559433 B CN107559433 B CN 107559433B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a dehumidifying electronic expansion valve of an air conditioning system, which belongs to the field of electronic expansion valves and solves the problems of high working noise and poor valve opening performance of the existing dehumidifying electronic expansion valve. The dehumidification electronic expansion valve also comprises a gear speed reducing mechanism, a slide block and a limiting device, wherein the valve body is provided with a flow inlet, a small valve port and a large valve port, the limiting device is used for limiting the sliding block, the small valve port is communicated with the large valve port through a capillary tube, the valve needle is used for opening and closing the small valve port, when the small valve port is opened, the limiting device is moved away from the sliding block, the gear reduction mechanism drives the sliding block to open the large valve port, so effectively improve the noise problem, promote the valve opening performance to guarantee the reliable and stable operation of air conditioning system.
Description
Technical Field
The invention relates to the field of electronic expansion valves, in particular to a dehumidification electronic expansion valve of an air conditioning system.
Background
In an air conditioning system having a dehumidification operation function, an indoor heat exchanger is generally configured by a first heat exchanger and a second heat exchanger, and a dehumidification electronic expansion valve is provided between the two heat exchangers, and during a normal operation of the system, the dehumidification electronic expansion valve is in a fully open state to cause the two heat exchangers to function as a single unit, and during a dehumidification operation of the system, the dehumidification electronic expansion valve functions as a throttle device, causes the first heat exchanger on a high-pressure side to function as a condenser, and causes the second heat exchanger on a low-pressure side to function as an evaporator. When the dehumidification electronic expansion valve is actually used, the dehumidification electronic expansion valve is arranged on an indoor unit, so that high requirements on noise are met, but when the existing dehumidification electronic expansion valve is opened, the refrigerant fluid is easy to impact to generate noise, and the noise is amplified indoors, so that a user doubts the product quality and the user experience is reduced; in addition, the existing dehumidification electronic expansion valve has a large flow resistance after the electronic expansion valve is fully opened due to the short stroke and the small caliber of the coil assembly, namely, a large pressure loss exists during the conventional operation of an air conditioning system, the performance of an air conditioner is greatly influenced, the existing dehumidification electronic expansion valve is mostly of an eccentric structure, and components in the electronic expansion valve are easy to lose position during severe vibration.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the dehumidification electronic expansion valve of the air-conditioning system, which effectively improves the noise problem and improves the valve opening performance, thereby ensuring the stable and reliable operation of the air-conditioning system.
The technical scheme adopted by the invention is as follows:
a dehumidification electronic expansion valve of an air conditioning system comprises a valve body, a valve needle and a driving device used for driving the valve needle to act, and further comprises a gear reduction mechanism, a sliding block and a limiting device, wherein a flow inlet, a small valve port and a large valve port are formed in the valve body, the limiting device is used for limiting the sliding block, the small valve port and the large valve port are communicated through a capillary tube, the valve needle is used for opening and closing the small valve port, when the small valve port is opened, the limiting device is moved away from the sliding block, and the gear reduction mechanism drives the sliding block to open the large valve port.
In a further scheme, the gear reduction mechanism comprises a driving gear, a transmission gear and a driven gear, the driving gear is driven by the driving device to rotate, the transmission gear is meshed between the driving gear and the driven gear, and the driven gear is connected with the sliding block.
According to a further scheme, the transmission gear comprises a positioning pin, a large gear and a small gear, the large gear and the small gear are sequentially and coaxially arranged on the positioning pin, the small gear is provided with a toothed part and a toothless part, the large gear is meshed with the driving gear, and when the toothed part of the small gear is meshed with the driven gear, the driven gear is driven to rotate.
In a further scheme, the limiting device comprises a limiting piece and a shifting piece, the limiting piece is fixed on the transmission gear, the limiting piece is clamped with the driven gear, so that the sliding block is limited, and when the small valve port is opened, the shifting piece shifts the limiting piece from the driven gear, so that the sliding block can move.
According to a further scheme, the shifting piece and the limiting piece are sequentially located on the lower portion of the pinion and fixed to the positioning pin, a limiting bubble is arranged at one end of the limiting piece, and a limiting hole is formed in the sliding block corresponding to the limiting bubble. The limiting bubble is embedded in the limiting hole and used for limiting the sliding block to move.
In a further scheme, the limiting sheet is provided with a convex bubble between the limiting bubble and the positioning pin. The bottom of the shifting piece is provided with a convex groove corresponding to the convex bubble, and the shifting piece pushes the convex bubble downwards through the convex groove so that the limiting piece falls off from the driven gear.
In a further scheme, the driving device comprises a magnetic rotor, a screw rod and a nut seat, the screw rod is in threaded fit with the nut seat, the magnetic rotor is used for driving the screw rod to rotate, the magnetic rotor is connected with the valve needle, and the driving gear is arranged on the screw rod.
In a further scheme, an elastic element is further arranged in the valve body and acts on the sliding block, so that the sliding block is attached to the large valve opening.
In a further scheme, the driven gear and the sliding block are integrally formed, and the bottom of the driven gear is higher than that of the sliding block.
In a further aspect, an outlet connection pipe is connected to the large valve port, the capillary tube is connected to the outlet connection pipe, and the capillary tube is spirally wound around the outlet connection pipe.
The invention has the beneficial effects that:
the invention relates to a dehumidification electronic expansion valve, wherein a valve body is provided with a flow inlet, a small valve port and a large valve port, the small valve port is communicated with the large valve port through a capillary tube, a valve needle is used for opening and closing the small valve port, and when the small valve port is opened, a gear reduction mechanism drives a sliding block to open the large valve port, so that the dehumidification electronic expansion valve has the advantages that: 1. after entering the valve body through the inflow port, the refrigerant enters the capillary tube through the small valve port, the capillary tube plays a role in buffering, and the fluid pressure of the refrigerant is slowly released in the process of flowing through the capillary tube, so that the working noise caused by sudden release impact of the fluid can be relieved; 2. due to the buffer action of the capillary tube on the fluid pressure, the pressure difference between the inner side and the outer side of the large valve port is reduced, namely the pressure difference between the two sides of the sliding block is reduced, so that the valve opening performance is improved; 3. due to the design of the small valve port and the large valve port, when the air-conditioning system is in normal operation, the small valve port and the large valve port are sequentially opened, the dehumidification electronic expansion valve completes a two-stage working mode from a small opening degree to a full opening degree, the fluid pressure is gradually released, the flow resistance of a refrigerant is effectively reduced, and further the pressure loss existing in the normal operation of the air-conditioning system is reduced, so that the stable and reliable operation of the air-conditioning system can be ensured; 4. due to the limiting design of the limiting device on the sliding block, the sliding block is not easy to lose position when the electronic dehumidification expansion valve vibrates violently.
The gear reduction mechanism comprises a driving gear, a transmission gear and a driven gear, the driving gear is driven by the driving device to rotate, the transmission gear is meshed between the driving gear and the driven gear, the driven gear is connected with the sliding block, the speed is reduced through the multi-stage gears, the valve opening torque is increased, and the flow control requirement of the air conditioning system with large refrigerating capacity can be met.
And the transmission gear comprises a large gear and a small gear which are coaxially arranged, the small gear is provided with a toothed part and a toothless part, the large gear is meshed with the driving gear, and the toothed part of the small gear is meshed with the driven gear to drive the driven gear to rotate. The transmission gear adopts a duplicate gear, and has simple structure and convenient assembly.
And the driving device comprises a magnetic rotor, a screw rod and a nut seat, the screw rod is in threaded fit with the nut seat, the magnetic rotor is used for driving the screw rod to rotate, the magnetic rotor is connected with the valve needle, and the driving gear is arranged on the screw rod. The driving gear is arranged on the screw rod, so that the assembly structure is simplified, and the cost is reduced.
And fifthly, an elastic element is further arranged in the valve body and acts on the sliding block, so that the sliding block is attached to the large valve opening. Under the state of small opening degree, the slide block can reliably close the large valve port, and the leakage of the refrigerant at the large valve port is reduced.
Sixthly, the driven gear and the sliding block are integrally formed. The assembly structure is simplified, the cost is reduced, and the bottom of the driven gear is higher than that of the sliding block, so that the limiting device is easily arranged below the driven gear 93.
And the large valve port is connected with an outlet connecting pipe, the capillary tube is connected to the outlet connecting pipe and spirally wound on the outlet connecting pipe, so that a path for the refrigerant to flow from the small valve port to the large valve port can be prolonged, the fluid pressure is released as much as possible, and the pressure difference on two sides of the sliding block is further reduced.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic perspective view of a dehumidification electronic expansion valve according to a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view of a dehumidification electronic expansion valve in a preferred embodiment of the present invention;
FIG. 3 is a front view of the dehumidification electronic expansion valve in an initial state in accordance with a preferred embodiment of the present invention;
FIG. 4 is a top view of FIG. 3 (with the valve cover removed);
FIG. 5 is a schematic perspective view of a part of the components of the electronic dehumidification expansion valve according to the preferred embodiment of the present invention;
FIG. 6 is a schematic perspective view of a position limiting device of the electronic dehumidification expansion valve according to the preferred embodiment of the present invention;
FIG. 7 is a front view of the dehumidification electronic expansion valve in a small opening state in accordance with the preferred embodiment of the present invention;
FIG. 8 is a top view of FIG. 7 (with the valve cover removed);
FIG. 9 is a front view of the dehumidification electronic expansion valve in a fully open state in accordance with the preferred embodiment of the present invention;
fig. 10 is a top view of fig. 9 (with the valve cover removed).
[ detailed description ] embodiments
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Referring to fig. 1 to 3, a dehumidification electronic expansion valve provided in a preferred embodiment of the present invention includes a valve body 1, a valve needle 6, and a driving device 5 for driving the valve needle 6 to move, a gear reduction mechanism, a slider 8, and a limiting device are disposed in the valve body 1, a flow inlet 16, a small valve port 13, and a large valve port 10 are disposed on the valve body 1, the limiting device is used for limiting the slider 8, the small valve port 13 and the large valve port 10 are communicated through a capillary tube 2, the valve needle 6 is used for opening and closing the small valve port 13, the slider 8 is used for opening and closing the large valve port 10, and when the small valve port 13 is opened, the limiting device is moved away from the slider 8, and the gear reduction mechanism drives the slider. Due to the arrangement of the capillary tube 2, when the dehumidification electronic expansion valve works, refrigerant enters the valve body 1 through the flow inlet 16 and then enters the capillary tube 2 through the small valve opening 13, the capillary tube 2 plays a role in buffering, and the fluid pressure of the refrigerant is slowly released in the process of flowing through the capillary tube 2, so that the working noise caused by sudden release and impact of the fluid can be relieved; moreover, due to the buffer action of the capillary tube 2 on the fluid pressure, the pressure difference between the inner side and the outer side of the large valve port 10 is reduced, namely the pressure difference between the two sides of the sliding block 8 is reduced, so that the valve opening performance is improved; due to the limit design of the limiting device on the sliding block 8, the sliding block is not easy to lose position when the dehumidification electronic expansion valve vibrates violently; due to the design of the small valve port 13 and the large valve port 10, when the air conditioning system is in normal operation, the small valve port 13 and the large valve port 10 are sequentially opened, the dehumidification electronic expansion valve completes a two-stage working mode from a small opening degree to a full opening degree, fluid pressure is gradually released, the flow resistance of a refrigerant is effectively reduced, and then the pressure loss existing in the normal operation of the air conditioning system is reduced, so that the stable and reliable operation of the air conditioning system can be ensured.
Specifically, the valve body 1 of the present embodiment includes a valve cover 11 and a base 12, the valve cover 11 and the base 12 are connected to form a valve chamber, the gear reduction mechanism and the slider 8 are disposed in the valve chamber, and the inlet 16, the small valve opening 13, and the large valve opening 10 are disposed on the base 12. In this embodiment, the small valve port 13 and the driving device 5 are both disposed at the center of the valve body 1, and the electronic dehumidification expansion valve of the invention is equivalent to other eccentric structure designs, so that the processing difficulty is obviously reduced. In the present embodiment, the small valve port 13 has a T-shaped cross section, the lower portion of the small valve port 13 is connected to the capillary 2, the small valve port 13 and the base 12 are designed to be separated from each other, and the small valve port 13 and the base 12 can be fixed to each other by welding.
In the state shown in fig. 4, the valve needle 6 closes the small valve port 13, the slider 8 covers the large valve port 10 to close the large valve port, and the inlet 16 is normally open. The gear reduction mechanism of the embodiment includes a driving gear 91, a transmission gear 92 and a driven gear 93, the driving gear 91 is driven by the driving device 5 to rotate, the transmission gear 92 is meshed between the driving gear 91 and the driven gear 93, and the driven gear 93 is connected with the slider 8. The scheme of this embodiment has increased the moment of opening the valve through multistage gear speed reduction, can satisfy the flow control requirement of big refrigerating output air conditioning system.
Referring to fig. 5, preferably: the transmission gear 92 of the embodiment adopts a duplicate gear, that is, the transmission gear 92 comprises a positioning pin 920, a big gear 921 and a small gear 922 which are coaxially arranged on the positioning pin 920, the number of teeth of the big gear 921 is greater than that of the small gear 922, and the two gears have the same angular speed, so that the speed reduction transmission can be realized, and the output of large torque is satisfied; the pinion 922 is provided with a toothed portion 9222 and a non-toothed portion 9221, specifically, half of the outer periphery of the pinion 922 is provided with a plurality of convex teeth to form the toothed portion 9222, the other half of the outer periphery of the pinion 922 is a smooth curved surface to form the non-toothed portion 9221, power can be transmitted to the driven gear 93 only when the toothed portion 9222 of the pinion 922 is meshed with the driven gear 93, so that the driven gear 93 is driven to rotate, the slider 8 is connected with the driven gear 93, and therefore the slider 8 can be driven by the driven gear 93 to move, and the slider 8 can be enabled to open or close the large valve port. The sliding block 8 and the driven gear 93 of the embodiment are of an integrally formed structure, so that the assembly structure is simplified, and the cost is reduced, and the bottom of the driven gear 93 is higher than the bottom of the sliding block 8, so that the limiting device is easily arranged below the driven gear 93. Of course, in other embodiments of the present invention, the sliding block and the driven gear may be formed separately, and the two are connected by machining, and the limiting device may also be directly disposed below the sliding block for limiting the sliding block.
Referring to fig. 6, preferably: the limiting device of the embodiment comprises a shifting piece 101 and a limiting piece 102 which are fixed on the transmission gear 92. The stopper piece 102 engages with the driven gear 93, so that the slider 8 is stopped. When the small valve port 13 is opened, the transmission gear 92 rotates to drive the poking piece 101 to rotate, and the poking piece 101 pokes the limiting piece 102 from the driven gear 92. The poking piece 101 and the limiting piece 102 are sequentially located at the lower part of the pinion 922 and fixed on the positioning pin 920, one end of the limiting piece 102 is provided with a limiting bubble 104, and the sliding block 8 is provided with a limiting hole corresponding to the limiting bubble 104. The limiting bubble 104 is embedded in the limiting hole and used for limiting the sliding block 8 to move. The position-limiting piece 102 is provided with a convex bubble 105 between the position-limiting bubble 104 and the positioning pin 920. The bottom of the pick 101 is provided with a convex groove 103 corresponding to the convex bubble 105. The shifting piece 101 pushes the convex bubble 105 downwards through the convex groove 103, so that the limiting piece 102 falls off from the driven gear 93.
Preferably, the following steps: the valve body 1 of the present embodiment is further provided with an elastic element therein, and the elastic element acts on the slider 8 to make the slider 8 tightly attached to the large valve port 10. In the small opening state of the dehumidification electronic expansion valve, only the small valve port 13 needs to be opened, and at the moment, the sealing performance of the large valve port 10 needs to be ensured, but because the pressure difference exists between the upper side and the lower side of the sliding block 8, the refrigerant is easy to leak at the large valve port 10. The elastic element of this embodiment is preferably a flat spring 7, the flat spring 7 is substantially trapezoidal, the upper end of the flat spring 7 is fixed on the valve cover 11, and in the closed state of the large valve port 10, the bending portion of the flat spring 7 abuts against the upper end surface of the slider 8 and exerts a certain pressure downward, so that the slider 8 is attached to the large valve port 10, and the sealing performance is ensured. In other embodiments of the present invention, the elastic element may also be a spring, a metal spring plate, or the like.
The driving device 5 of the present embodiment comprises a magnetic rotor 53, a screw 52 and a nut seat 51, wherein the screw 52 is in threaded fit with the nut seat 51, the magnetic rotor 53 is used for driving the screw 52 to rotate, the magnetic rotor 53 is connected with the valve needle 6, and the driving gear 91 is arranged on the screw 52. Specifically, a positioning seat 15 is provided at the upper end of the valve body 1, a sleeve 14 is fixed on the positioning seat 15, a coil assembly (not shown in the figure) is sleeved outside the sleeve 14, the driving device 5 is assembled in the sleeve 14, wherein a nut seat 51 is fixedly connected to the positioning seat 15, a screw rod 52 is vertically arranged through the nut seat 51, a part of the screw rod 52 and the nut seat 51 form a thread fit relationship, a magnetic rotor 53 is fixedly connected to the upper end of the screw rod 52, and a valve needle 6 is connected to the lower end of the screw rod 52, preferably: the valve needle 6 and the screw 52 of the present embodiment are integrally formed, which is convenient for processing and assembling, and in other embodiments of the present invention, the valve needle and the screw can be separately formed and connected by machining. Because the nut seat 51 is fixed relative to the screw 52, the magnetic rotor 53 drives the screw 52 to rotate, and simultaneously, the screw 52 can move up and down, so that the small valve port 13 can be opened and closed. In this embodiment, in order to simplify the assembly structure and reduce the cost, the driving gear 91 is disposed on the screw 52, and the driving gear 91 may be fixed to the screw 52 by machining or may be integrally formed with the screw 52.
To ensure that the displacement of the screw 52 in the axial direction of the nut holder 53 is performed within a predetermined range, a stop means needs to be provided. The stopping device of the present embodiment includes a stopping ring 61 and a spring guide rail 62, an upper stopping portion is formed at the upper portion of the spring guide rail 62, a lower stopping portion is formed at the lower portion of the spring guide rail 62, the spring guide rail 62 is sleeved on the nut seat 51, the stopping ring 61 can rotate and axially displace along the spring guide rail 62 under the action of the magnetic rotor 53 until the stopping ring abuts against the upper stopping portion or the lower stopping portion, in the present embodiment, the stopping device limits the axial displacement of the screw rod 52 equivalent to the number of rotation turns of the screw rod 52 and the driving gear 91, and the swing angle of the slider 8 is also limited through the transmission of the gear reduction mechanism.
Preferably, the following steps: in order to connect the heat exchanger in the system, the inlet connecting pipe 4 is connected to the inlet 16 of the valve body 1, and the outlet connecting pipe 3 is connected to the large valve port 10, in this embodiment, one end of the capillary tube 2 is connected to the small valve port 13, and the other end of the capillary tube 2 is connected to the outlet connecting pipe 3, thereby realizing the communication between the small valve port 13 and the large valve port 10. More preferably: the capillary tube 2 is spirally wound on the outlet connecting tube 3, namely the capillary tube 2 is spirally wound on the periphery of the outlet connecting tube 3 for a plurality of circles before being connected with the outlet connecting tube 3, so that the path of the refrigerant flowing from the small valve port 13 to the large valve port 10 can be prolonged, the fluid pressure can be released as much as possible, and the pressure difference on two sides of the sliding block 8 can be further reduced.
The working principle of the embodiment is as follows:
referring to fig. 3 and 4, in an initial state, the valve needle 6 closes the small valve port 13, the slider 8 covers the large valve port 10 to close the small valve port, and the limiting piece 102 is engaged with the driven gear 93 to limit the slider 8; referring to fig. 7 and 8, in the state of small opening, the magnetic rotor 53 drives the screw rod 52 to rotate, the screw rod 52 drives the valve needle 6 to rise to open the small valve port 13, during the opening process of the small valve port 13, the toothed portion 9222 of the pinion 922 is not meshed with the driven gear 93, and the driven gear 93 does not rotate, so that the valve needle slides to maintain the original position; after the small valve port 13 is opened, the refrigerant flows out from the small valve port 13, the capillary tube 2 and the outlet connecting tube 3, the toothed part 9222 of the small gear 922 is meshed with the driven gear 93, at this time, the poking piece 101 is driven by the rotation of the transmission gear 92 and is arranged below the limiting piece 102, and the poking piece 101 pushes the convex bubble 105 downwards through the convex groove 103, so that the limiting piece 102 falls off from the driven gear 93; referring to fig. 9 and 10, in the full opening state, the magnetic rotor 53 continues to drive the screw rod 52 to rotate, the screw rod 52 continues to drive the valve needle 6 to rise, and along with the rotation of the transmission gear 92, the toothed portion 9222 of the pinion 922 is meshed with the driven gear 93, so that the driven gear 93 is driven to rotate, the driven gear 93 drives the slider 8 to move, and the slider 8 opens the large valve port 10, so as to achieve full opening. In the valve closing process, when the driven gear 93 rotates reversely, the poking sheet 101 is driven by the rotation of the transmission gear 92 to leave the limiting sheet 102, the convex groove 103 is separated from the top of the convex bubble 105, the limiting sheet 102 tilts upwards and resets under the elastic action, so that the limiting bubble 104 is embedded into the limiting hole, and the sliding block 8 is continuously limited.
When the air conditioning system is in normal operation, the dehumidification electronic expansion valve is in a full-open state, namely the dehumidification electronic expansion valve completes a two-stage working mode from a small opening degree to a full opening degree; when the system dehumidifies, the electronic dehumidification expansion valve acts as a throttling device, and only the small valve port 13 is opened.
The embodiment of the invention is applied to an air conditioning system.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (8)
1. A dehumidification electronic expansion valve of an air conditioning system comprises a valve body, a valve needle and a driving device for driving the valve needle to act, and further comprises a gear reduction mechanism, a sliding block and a limiting device, wherein a flow inlet, a small valve port and a large valve port are formed in the valve body, the limiting device is used for limiting the sliding block, the small valve port and the large valve port are communicated through a capillary tube, the valve needle is used for opening and closing the small valve port, after the small valve port is opened, the limiting device is moved away from the sliding block, and the gear reduction mechanism drives the sliding block to open the large valve port;
the gear speed reducing mechanism comprises a driving gear, a transmission gear and a driven gear, the driving gear is driven by the driving device to rotate, the transmission gear is meshed between the driving gear and the driven gear, and the driven gear is connected with the sliding block;
the transmission gear comprises a positioning pin, a large gear and a small gear, the large gear and the small gear are sequentially and coaxially arranged on the positioning pin, the small gear is provided with a toothed part and a toothless part, the large gear is meshed with the driving gear, and the toothed part of the small gear is meshed with the driven gear to drive the driven gear to rotate.
2. A dehumidifying electronic expansion valve for an air-conditioning system as claimed in claim 1, wherein said limiting means comprises a limiting plate and a shifting plate fixed to said driving gear, said limiting plate is engaged with said driven gear so that said sliding block is limited, and when said small valve port is opened, said shifting plate shifts down said limiting plate from said driven gear so that said sliding block can move.
3. A dehumidifying electronic expansion valve of an air-conditioning system as claimed in claim 2, wherein said pick-up and said position-limiting piece are sequentially located at a lower portion of said pinion and fixed to said positioning pin, one end of said position-limiting piece is provided with a position-limiting bubble, and said slider is provided with a position-limiting hole corresponding to said position-limiting bubble; the limiting bubble is embedded in the limiting hole and used for limiting the sliding block to move.
4. A dehumidifying electronic expansion valve for an air-conditioning system as claimed in claim 3, wherein said position-limiting piece is provided with a convex bubble between said position-limiting bubble and said positioning pin; the bottom of the shifting piece is provided with a convex groove corresponding to the convex bubble, and the shifting piece pushes the convex bubble downwards through the convex groove so that the limiting piece falls off from the driven gear.
5. A dehumidifying electronic expansion valve for air conditioning system as claimed in claim 1, wherein said driving means comprises a magnetic rotor, a screw rod and a nut seat, said screw rod is screw-engaged with said nut seat, said magnetic rotor is for driving said screw rod to rotate, said magnetic rotor is connected to said valve needle, and said driving gear is provided on said screw rod.
6. A dehumidifying electronic expansion valve for an air-conditioning system as claimed in claim 1, wherein an elastic member is further provided in said valve body, said elastic member acting on said slider to make said slider abut against said large valve opening.
7. A dehumidifying electronic expansion valve for an air conditioning system as claimed in claim 1, wherein said driven gear is formed integrally with said slider, and a bottom of said driven gear is higher than a bottom of said slider.
8. A dehumidifying electronic expansion valve for an air-conditioning system as claimed in any one of claims 1 to 7, wherein an outlet connection pipe is connected to said large valve port, and said capillary tube is connected to said outlet connection pipe, and said capillary tube is spirally wound around said outlet connection pipe.
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| CN201610498256.9A CN107559433B (en) | 2016-06-30 | 2016-06-30 | Dehumidification electronic expansion valve of air conditioning system |
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| CN201610498256.9A CN107559433B (en) | 2016-06-30 | 2016-06-30 | Dehumidification electronic expansion valve of air conditioning system |
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| CN110939745B (en) * | 2018-09-25 | 2023-10-13 | 浙江三花智能控制股份有限公司 | Electronic expansion valve |
| CN110220029B (en) * | 2019-07-10 | 2024-02-27 | 诸暨市亿霸电子阀门有限公司 | Driving mechanism of electronic expansion valve |
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| CN107559433A (en) | 2018-01-09 |
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