CN101173714B - Electronic expansion valve - Google Patents
Electronic expansion valve Download PDFInfo
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- CN101173714B CN101173714B CN2006101545152A CN200610154515A CN101173714B CN 101173714 B CN101173714 B CN 101173714B CN 2006101545152 A CN2006101545152 A CN 2006101545152A CN 200610154515 A CN200610154515 A CN 200610154515A CN 101173714 B CN101173714 B CN 101173714B
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- screw thread
- thread guiding
- valve seat
- guiding element
- valve
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Abstract
The invention relates to an electronic expansion valve, belonging to the technical field of parts used in the refrigeration system. The prior art has the drawback that the screw thread guiding component is inclined to be loose and even pull-off from the valve base. The invention is characterized in that: a concave part is arranged at the place corresponding to the valve port on the valve base; the circumferential direction of the lower end of the screw thread guiding component is positioned in the concave part; a positioning part is arranged on the screw thread guiding component and stands outside of the valve base; a pull-off-proof component is sleeved the screw thread guiding component and touches the positioning part; the anti-fallingcomponent is fixedly connected with the valve base. Thus the screw thread guiding component is reliably fixed, which prevents the loosening due to friction and vibration. The invention has an advantage that the invention is particularly suitable for the refrigeration circulation which adopts comparatively high-pressure CO2 coolant, due to the reinforcement of the screw thread guiding component.
Description
Technical field
The present invention relates to the parts that refrigeration system is used, specifically a kind of electric expansion valve of regulating cold medium flux particularly uses CO
2The electric expansion valve of the freezing cycle device of (carbon dioxide gas) refrigerant.
Background technique
Be installed on electric expansion valve in the refrigerating circulation system as flow control valve, comprise valve seat, outer cover and be positioned at coil outside the outer cover: be connected with two adapters on the valve seat, offer the valve port between two adapters in the valve seat, corresponding described valve port is provided with the screw thread guiding element; Outer cover is connected on the valve seat and forms enclosed cavity above valve port; In enclosed cavity, dispose the magnetic rotor component in inductor coil magnetic field, be connected with needle on this magnetic rotor component and be provided with the screw thread promotion part that cooperates with the screw thread guiding element; So, when when electric current is set in the coil input, coil generates an electromagnetic field and acts on magnetic rotor component, make magnetic rotor component rotate, because magnetic rotor component is provided with the screw thread promotion part that cooperates with the screw thread guiding element, therefore also be with needle to move axially in its rotation, the position that changes needle and valve port concerns and the aperture of adjusting valve port; The medium that flows to another adapter by an adapter promptly changes its flow because of the change of valve port opening therebetween.
Shown in Figure 1 is a kind of structure of the described electric expansion valve of leading portion, valve shaft 39 is injection molded into magnetic rotor component with magnet 8 one, and screw thread guiding element 11 is assemblied in the recess of valve seat upper end interior (being interference fit between screw thread guiding element and the recess), needle 28 is assemblied in valve shaft 39 lower ends, is being with needle to move axially by the valve shaft 39 and the screw-thread fit realization magnetic rotor component of screw thread guiding element 11 when rotating.
And patent documentation 1 (spy opens clear 60-196477) also discloses the structure of another kind of electric expansion valve: its magnetic rotor component is by magnet, supporting drum and riffled tube are assembled, its screw thread guiding element is (to realize assembling by screw thread between screw thread guiding element and the recess) in male-pipe and the recess that equally also is assemblied in the valve seat upper end, needle is connected on the binding wall that the supporting drum intermediate portion forms and is positioned at male-pipe, by cooperating of riffled tube and screw thread guiding element, realize that equally magnetic rotor component is being with needle to move axially when rotating in screw thread guiding element (male-pipe).
Yet, said structure all is based on circulation medium and designs for traditional freon, and freon and refrigerator oil have reasonable intermiscibility, therefore equal available metal material of needle, valve shaft, riffled tube and screw thread guiding element such as the carbon steel in above-mentioned all structures made, but needn't worry friction therebetween, in other words, can be in freon mixed freezing machine oil and these Structural Hardwares are lubricated, guarantee their dexterity of action.
But freon is disadvantageous as the refrigeration circulation medium to environmental protection, so industry has been explored and utilized CO
2(carbon dioxide gas) is as the refrigeration system of refrigeration circulation medium with replacement freon, however CO
2But to can not show a candle to freon good with the intermiscibility of refrigerator oil, and that its pressure of circulation time in system requires is higher, and for this reason, patent documentation 2 (spy opens 2003-254461) provides the technological scheme that realizes bearing elevated pressures by laser bonding.
Even above-mentioned several scheme has all embodied its enthusiasm from different angles, but because of not separating the CO that never contains refrigerator oil comprehensively and effectively
2The big and pressure problem of higher of dielectric friction and have a strong impact on the working life of electromagnetic expanding valve and the good operation of refrigeration system is in particular in the following aspects:
Single vibrations from the friction that exists between the moving element and system cause the loosening of screw thread guiding element and under the situation of interference fit between screw thread guiding element and the recess, the possibility that bigger pressure may cause the screw thread guiding element to break away from from valve seat is even the existence of these defectives also can cause the ineffective inefficacy that causes refrigeration system of electric expansion valve in the refrigeration system of freon as the refrigeration circulation medium; And at CO
2Also there is following defective in (carbon dioxide gas) as the refrigeration system of refrigeration circulation medium:
The existence of big frictional force, light then make electric expansion valve slow movement and move dumb, heavy then can hinder the action of electric expansion valve;
The precision that the quick wearing and tearing of the above-mentioned parts that cause because of friction when action lose cooperation causes electric expansion valve to be scrapped fast;
Because of fricative metal fillings can confuse at CO
2Flow together in the refrigeration circulation medium, may cause the smooth even obstruction of circulating path, influence the normal operation of whole refrigeration system.
Summary of the invention
The technical assignment of the present invention's technical problem at first to be solved and proposition is the defective that overcomes the friction of prior art existence, and a kind of electric expansion valve is provided; And on this basis, fundamentally overcome the easily loosening even defective that come off from valve seat of screw thread guiding element that above-mentioned prior art exists.For this reason, the present invention is by the following technical solutions:
A kind of electric expansion valve, comprise valve seat, outer cover and be positioned at coil outside the outer cover: be connected with two adapters on the described valve seat, be provided with the valve port between two adapters in the valve seat, corresponding described valve port is provided with the screw thread guiding element; Described outer cover is connected on the valve seat and forms enclosed cavity above valve port; In enclosed cavity, dispose the magnetic rotor component of the described coil magnetic field of induction, be connected with needle on this magnetic rotor component and be provided with the screw thread promotion part that cooperates with described screw thread guiding element; It is characterized in that: the position of corresponding described valve port is provided with recess on the described valve seat, described screw thread guiding element is by the sintering metal moulding, described screw thread guiding element lower end circumferentially is positioned at and realizes its fixing on valve seat in the described recess, the remaining part of described screw thread guiding element is given prominence to outside the described valve seat and this part is provided with the positioning part of the axial step shape that exposes outside described valve seat, and an anticreep spare is pressed on this positioning part fixedlys connected with described valve seat.
As the further of technique scheme improved and replenish, the present invention also comprises following additional technical feature:
Described electric expansion valve is characterized in that: the lower end of described screw thread guiding element is pressed in the described recess by the mode that is pressed into.
Described electric expansion valve is characterized in that: described positioning part is the axial step that is arranged on the described screw thread guiding element, and described anticreep spare is pressed on this axial step.
Described electric expansion valve is characterized in that: described axial step is positioned at the adjacent portion of described screw thread guiding element and valve seat.
Described electric expansion valve, it is characterized in that: described positioning part is the just round off-set construction that departs from screw thread guiding element cross section excircle configuration that is arranged on the described screw thread guiding element, and described anticreep spare is provided with the circumferential retainer that matches with this just round off-set construction.
Described electric expansion valve is characterized in that: described just round off-set construction and circumferential retainer are respectively the straight flange that is arranged on screw thread guiding element and the anticreep spare.
Described electric expansion valve is characterized in that: described just round off-set construction and circumferential retainer are respectively groove and the protuberance that is arranged on screw thread guiding element and the anticreep spare.
Described electric expansion valve is characterized in that: the lower end of described screw thread guiding element and described recess interference fit.
Described electric expansion valve is characterized in that: the lower end of described screw thread guiding element and described recess screw-thread fit.
Described electric expansion valve is characterized in that: described shell-like anticreep spare and described valve seat welding.
Described electric expansion valve is characterized in that: be provided with flange around the upper end of described valve seat, the recess, this flange inner forms the accommodating part, and described anticreep spare is positioned at this accommodating part, the edge of anticreep spare and described flange laser bonding.
Described electric expansion valve is characterized in that: described screw thread guiding element is made by sintering metal.
The invention has the beneficial effects as follows:
The screw thread guiding element is made of sintering metal, and the micropore of itself can keep lubricant oil, with keep action relative with it between lubricity, reduce friction, make their flexible starts.
By the screw thread guiding element circumferentially being positioned in the recess of valve seat, and the screw thread guiding element is provided with exposed positioning part, with an anticreep spare be enclosed within on the screw thread guiding element and with the positioning part touch to, and shell-like anticreep spare is fixedlyed connected with valve seat, realize the secure fixation of double thread guiding element thus, prevent from because of friction and shake to become flexible; And the reinforcing of this structure double thread guiding element is particularly useful for adopting the CO of elevated pressures
2In the freeze cycle of refrigerant.
Description of drawings
Fig. 1: a kind of structural representation of existing electric expansion valve.
Fig. 2: a kind of structural representation of electric expansion valve of the present invention.
Fig. 3: the screw thread guiding element of structure shown in Figure 2 is connected the structural representation on the valve seat.
Fig. 4: the valve seat construction schematic representation in the structure shown in Figure 2.
Fig. 5 a: a kind of structural representation of the anticreep spare in the structure shown in Figure 2.
Fig. 5 b: the plan view of Fig. 5 a.
Fig. 6 a: the another kind of structural representation of the anticreep spare in the structure shown in Figure 2.
Fig. 6 b: the plan view of Fig. 6 a.
Fig. 7 a: a kind of structural representation of the valve seat in the structure shown in Figure 2.
Fig. 7 b: the E-E of Fig. 7 a is to sectional view.
Fig. 8 a: the another kind of structural representation of the valve seat in the structure shown in Figure 2.
Fig. 8 b: the K-K of Fig. 8 a is to sectional view.
Among the figure: the cylindrical portion of 1-outer cover, 2-stop rod, the movable stopper of 3-, the annulus portion of 4-stop rod, 5-supporting element, the stepped part of 6-pipe portion inboard, the pipe portion of 7-outer cover, the 8-permanent magnet, the guide section of 9-screw thread guiding element, the internal thread segment of 10-screw thread guiding element, 11-screw thread guiding element, the step of 12-screw thread guiding element, 13-anticreep spare, the supporting section of 14-screw thread guiding element, the step that forms on the 15-valve seat periphery, 16-takes over, the 17-valve port, and 18-takes over, the following side of 19-valve port seat blade of a sword portion, the blade of a sword portion of 20-valve port seat, the upper face side of 21-valve port seat blade of a sword portion, 22-valve port seat, the 23-valve pocket, the 24-valve seat, the columnar portion of 25-valve seat, 26-through hole, the 27-limiting component, the 28-needle, the vertical hole of 29-valve shaft, 30-collapse coil spring, the 31-steel ball, the intermediate portion of 32-valve shaft extension part, the first head of 33-valve shaft, 34-enclosed cavity, 35-spirally-guided spare, the supporting portion of 36-valve shaft, the external thread part of 37-valve shaft, the slide part of 38-valve shaft, the 39-valve shaft, the 40-accommodating part, 41-recess, the straight flange of 42-anticreep spare, the protuberance of 43-anticreep spare, the 44-flange, the straight flange of 45-screw thread guiding element, the groove of 46-screw thread guiding element, the binding wall of 47-permanent magnet, the blade of a sword portion of 48-supporting element, the opening portion of 49-outer cover, 50-stop fixing rod.
Embodiment
Electric expansion valve as shown in Figure 2 mainly comprises valve seat 24, screw thread guiding element 11, magnetic rotor component, needle 28, outer cover and coil:
As shown in Figure 4, valve seat 24 has valve pocket 23, part body and establish the tubular valve port seat 22 that the axial section shaped slightly is " ∏ " font within it, the top center place of valve port seat 22 is formed with valve port 17, and the downside that is pressed into valve pocket 23 by the blade of a sword portion 20 with this valve port seat 22 to the upper face side 21 of blade of a sword portion contacts with valve seat 24;
Be connected with adapter 16 on the above-mentioned valve seat 24 and take over 18, adapter 18 is joined with the following side 19 of the blade of a sword portion 20 of valve port seat 24, and is fixed on the valve seat 24 by the mode as soldering, thus, promptly by this adapter 18 and valve seat 24 valve port seat 22 is fixed on the valve seat 24;
And, be formed with columnar portion 25 on the valve seat 24, this columnar portion 25 is established continuously with valve pocket 23, be formed with through hole 26 in columnar portion 25 centers, upside at through hole 26 is formed with circular hole recess 41, be higher than recess 41 around be provided with flange 44, the inboard of this flange 44 forms accommodating part 40.
Screw thread guiding element 11 is upright (standing up) top at valve seat 24 of establishing of tubular shown in Fig. 2,3, it makes (powder metallurgy) by sintering metal, it has cylindric guide section 9, internal thread segment 10 and the supporting section 14 of continuous setting from top to bottom, and be formed with in its outside axial step 12 or just round off-set construction shown in Fig. 7 a, 7b straight flange 45 or the groove shown in Fig. 8 a, 8b 46 as the positioning part, perhaps possess step and just round off-set construction simultaneously as the positioning part.
This screw thread guiding element 11 stands up when being formed on the top of above-mentioned valve seat 24, do not need by riveted joint or be pressed into affixed or even with means of fixation such as valve seat welding, but the recess 41 of earlier its lower end being inserted valve seat is circumferentially located (suitable with the recess internal diameter as screw thread guiding element lower end external diameter), by the discoideus anticreep spare 13 that adopts metal such as stainless steel to make it is fastened on the valve seat 24, prevents that it breaks away from from valve seat 24.Concrete, according to the concrete structure of screw thread guiding element 11, the interior bore edges of anticreep spare 13 can be arranged to straight flange 42 shown in Fig. 5 a, the 5b or the protuberance shown in Fig. 6 a, 6b 43.
Screw thread guiding element 11 and anticreep spare 13 according to said structure, only valve seat recess 41 need be inserted in the lower end of screw thread guiding element 11, step 12 on it maintains an equal level with the bottom surface of accommodating part 40, corresponding anticreep spare is being enclosed within on the screw thread guiding element 11 and is being pressed on the step 12, and the protuberance 43 of anticreep spare 13 is stuck in the groove 46 of screw thread guiding element, perhaps the straight flange 42 of anticreep spare 13 contacts with each other with the straight flange 45 of screw thread guiding element 11, afterwards by the flange 44 adjoiners welding of laser bonding at the edge and the valve seat of anticreep spare 13, promptly realize the fixing of double thread guiding element 11, the circumferential rotation of restriction screw thread guiding element 11 and moving axially, the impact of the vibrations that can bear bigger frictional force and come from the outside and unlikely loosening, and under bigger system pressure, screw thread guiding element 11 can not come off from valve seat yet, to adapt to CO
2The requirement of the freeze cycle of refrigerant.
Magnetic rotor component by permanent magnet 8 with constitute the magnetic rotor component structure identical with stainless steel valve shaft 39 that the binding wall 47 of this permanent magnet 8 forms one with the electric expansion valve of earlier figures 1.
The first head 33 of valve shaft 39 is provided with stop rod 2, embeds above-mentioned first head 33 with this stop rod 2 bottoms incorporate annulus portion 4, fetches affixed by laser beam welding.
Moreover, be formed with supporting portion 36, external thread part 37, slide part 38 and vertical hole 29 on the valve shaft 39, and be positioned at the central part of permanent magnet 8, in above-mentioned vertical hole 29, in vertical hole 29, deviate from by limiting component 27 restriction needles 28 between steel ball 31 and collapse coil spring 30 downsides, needle 28 connects with the through hole 26 of above-mentioned cylindrical body 25, contacts with the valve port 17 of valve port seat 22 or breaks away from.
In addition, the above-mentioned valve shaft 39 upright tops that are located at valve seat 24 are supported by the tubular screw thread guiding element 11 that holds just as the valve shaft of establishing towards the inner space of above-mentioned permanent magnet 8.
By above-mentioned screw thread guiding element 11, the external thread part 37 of valve shaft 39 screws togather with the internal thread segment 10 of screw thread guiding element 11, slide part 38 and supporting section 14 guiding, supporting portion 36 and guide section 9 guiding.
Outer cover docks joint (such as laser bonding) by the stainless steel tubular portion 7 of whole same thickness and forms with cylindrical duct 1, the step 15 that forms on the opening portion 49 of outer cover and valve seat 24 peripheries dock joint (such as: laser bonding) outer cover is fixed on the valve seat, and forms enclosed cavity 34 between outer cover and valve seat.
And outer cover also can pass through the integrally formed cup-shaped of stainless steel material.
In cylindrical duct 1, the stop fixing rod 50 of spirally-guided spare 35 is housed, be to have closed movable stopper 3 on the spirally-guided spare 35, movable stopper 3 moves by the stop rod 2 that is contained on the valve shaft 39, follow rotation along with magnetic rotor component, movable stopper 3 moves up and down along spirally-guided spare 35, by with the upper end retainer of spirally-guided spare 35 and contacting of lower end retainer, stipulated valve opening position or closed the movement travel of the magnetic rotor component of valve direction.
And outer cover 11 also can pass through the integrally formed cup-shaped of stainless steel material.
Coil is not shown in the drawings, and its is enclosed within as the stator of stepper motor roughly the same and is connected outside the outer cover and is located by connecting on the stator support on the valve seat, can implement according to prior art based on this structure, does not repeat them here.
As mentioned above, by above-mentioned valve shaft 39 and above-mentioned screw thread guiding element 11, constituted the valve actuator function of the valve port 17 of needle 28 contacts or disengaging valve port seat 22.Promptly, ordering about magnetic rotor component by coil rotates, then the internal thread 10 of the external thread section 37 of valve shaft 39 and screw thread guiding element 11 carries out screw thread system and closes, magnetic rotor component moves along axial direction (above-below direction), axial direction by this magnetic rotor component moves, needle 28 moves along axial direction (above-below direction), the valve port 17 of valve port seat 22 of coming in and going out, thus carry out flow control.
In this flow control, above-mentioned screw thread guiding element 11 is made of sintering metal, because the micropore of sintering metal can keep lubricant oil, therefore can keep the lubricity of screw thread guiding element, has realized sliding screw thread guiding element preferably.As a result, valve shaft 39 can obtain slick and sly sliding with the holding function of the valve that screw thread guiding element 11 constitutes, thereby carries out reliable flow control.And, because screw thread guide element 11 is fixing by the anticreep spare 13 that is fixed on by laser bonding on the valve seat 24, therefore, even screw thread guiding element 11 is made of sintering metal, can not produce heat affecting that welding produces and the distortion fixedly the time, can guarantee flow control accuracy.In addition, anticreep spare 13 is by laser bonding, and the bond strength between the valve seat 24 can be guaranteed fully that the intensity that guide element is fixed on the valve seat also can fully guarantee, therefore, is using CO
2In the freezing cycle device of refrigerant, can carry out correct flow control, applicable to high refrigerant pressure.
In the said structure:
As the screw thread promotion part of magnetic rotor component is outside thread 37 on the valve rod, and therefore corresponding internal thread 10 is set on screw thread guiding element 11, and this situation that is threaded and structure shown in Figure 1 are similar; And for the thread connecting mode of patent documentation 1, under the enlightenment of basic design of the present invention, equally can be with its male-pipe as the screw thread guiding element, with the screw thread promotion part of its riffled tube as magnetic rotor component, in this case, it is obvious by anticreep spare male-pipe being fastened on the valve seat, does not repeat them here.
And described screw thread guiding element 11, be as simple in structure its lower end is put in the recess 41 of valve seat shown in Figure 1, and, can be assemblied in by the mode that is threaded in the recess of valve seat equally according to the mode of patent documentation 1, fastening by anticreep spare more afterwards, do not repeat them here.
Claims (3)
1. electric expansion valve, comprise valve seat (24), outer cover and be positioned at coil outside the outer cover: be connected with two adapters (16,18) on the described valve seat (24), be provided with the valve port (17) that is positioned between two adapters (16,18) in the valve seat (24), corresponding described valve port (17) is provided with screw thread guiding element (11); Described outer cover is connected valve seat (24) and upward and in the top of valve port (17) forms enclosed cavity (34); In enclosed cavity (34), dispose the magnetic rotor component of the described coil magnetic field of induction, be connected with needle (28) on this magnetic rotor component and be provided with the screw thread promotion part that cooperates with described screw thread guiding element (11); It is characterized in that: the position that described valve seat (24) is gone up corresponding described valve port (17) is provided with recess (41), described screw thread guiding element (11) is by the sintering metal moulding, described screw thread guiding element (11) lower end circumferentially is positioned at and realizes its fixing on valve seat (24) in the described recess (41), the remaining part of described screw thread guiding element (11) is given prominence to outside the described valve seat (24) and this part is provided with the positioning part of axial step (12) shape that exposes outside described valve seat (24), and an anticreep spare (13) is pressed on this positioning part fixedlys connected with described valve seat (24).
2. electric expansion valve according to claim 1 is characterized in that: the lower end of described screw thread guiding element (11) is pressed in the described recess (41) by the mode that is pressed into.
3. electric expansion valve according to claim 2 is characterized in that: described anticreep spare (13) is fixed on the above-mentioned valve seat (24) by laser bonding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101545152A CN101173714B (en) | 2006-11-03 | 2006-11-03 | Electronic expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101545152A CN101173714B (en) | 2006-11-03 | 2006-11-03 | Electronic expansion valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101173714A CN101173714A (en) | 2008-05-07 |
| CN101173714B true CN101173714B (en) | 2010-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101545152A Active CN101173714B (en) | 2006-11-03 | 2006-11-03 | Electronic expansion valve |
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| Country | Link |
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| CN (1) | CN101173714B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806774A (en) * | 2014-01-26 | 2015-07-29 | 杭州三花研究院有限公司 | Electronic expansion valve |
| EP3672030A1 (en) * | 2018-12-20 | 2020-06-24 | Danfoss A/S | Valve, in particular expansion valve |
| CN111365466B (en) * | 2018-12-25 | 2022-09-06 | 浙江盾安禾田金属有限公司 | Electronic expansion valve and air conditioning system using same |
| WO2020135162A1 (en) | 2018-12-25 | 2020-07-02 | 浙江盾安人工环境股份有限公司 | Electronic expansion valve and air conditioning system using same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048180A (en) * | 1989-06-23 | 1991-01-02 | 兴城市粉末冶金厂 | Drill chuck nut |
| CN2467849Y (en) * | 2001-02-20 | 2001-12-26 | 李振邦 | Electronic expansion valve |
-
2006
- 2006-11-03 CN CN2006101545152A patent/CN101173714B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048180A (en) * | 1989-06-23 | 1991-01-02 | 兴城市粉末冶金厂 | Drill chuck nut |
| CN2467849Y (en) * | 2001-02-20 | 2001-12-26 | 李振邦 | Electronic expansion valve |
Non-Patent Citations (2)
| Title |
|---|
| CN 1048180 A,说明书第2页第3行-第5页倒数第1行. |
| JP特开平11-316068A 1999.11.16 |
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Owner name: ZHEJIANG SANHUA GROUP CO., LTD. Free format text: FORMER OWNER: SANHUA REFRIGERATION GROUP CO., LTD., ZHEJANG Effective date: 20140624 |
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Effective date of registration: 20140624 Address after: 312500 Zhejiang city of Shaoxing province Xinchang County Chengguan town of Liquan Patentee after: Zhejiang Sanhua Group Co., Ltd. Address before: 312500 Zhejiang County in Xinchang Province town of Liquan Patentee before: Sanhua Refrigeration Group Co., Ltd., Zhejang |
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Address after: 312500 Xinchang, Zhejiang Qixing street under the Liquan Patentee after: Zhejiang three flower intelligent control Limited by Share Ltd Address before: 312500 Zhejiang city of Shaoxing province Xinchang County Chengguan town of Liquan Patentee before: Zhejiang Sanhua Group Co., Ltd. |
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