CN102200190B - Four-way reversing valve - Google Patents
Four-way reversing valve Download PDFInfo
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- CN102200190B CN102200190B CN201010137681.8A CN201010137681A CN102200190B CN 102200190 B CN102200190 B CN 102200190B CN 201010137681 A CN201010137681 A CN 201010137681A CN 102200190 B CN102200190 B CN 102200190B
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Abstract
The invention provides a four-way reversing valve of a valve seat adopting a novel processing mode and the valve seat. The valve seat is processed by a powder injection forming technology, so that the valve seat can be made of stainless steel, stainless iron and other iron and steel material or other relatively uneasy heat conduction materials to reduce heat loss of the four-way reversing valve and avoid the problem of difficulty in mechanical cutting and processing caused by adoption of the materials. The valve seat is processed by employing a powder injection forming technology; compared with the conventional method of cutting and processing irregularly-shaped sections, the powder injection forming technology has the advantages that: the consumption of material is obviously reduced, and particularly-structured shapes can be formed, so that the contact surface between the valve seat and a valve body of the four-way reversing valve can be reduced during welding, and the welding quality is ensured. Moreover, the valve seat has lower heat conductivity, so that the heat loss between a high-temperature refrigerant and a low-temperature refrigerant can be reduced, and the energy-saving effect of an air conditioner is effectively improved.
Description
Technical field
The present invention relates to a kind of refrigerating field solenoid valve used or electromagnetism four-way change-over valve, be specifically related to valve seat and the four-way change-over valve of a kind of solenoid valve of using on air conditioner or refrigerator or four-way change-over valve.
Background technique
Along with developing rapidly of economy, energy shortage problem becomes and becomes increasingly conspicuous, and the green economy of development energy-conserving and environment-protective is emphasis of current development of all countries economy.For air-conditioning and HVAC industry, the air conditioner of development energy-conserving and environment-protective and refrigerator are the research directions of this kind of enterprise.Heat pump type air conditioner is that one can absorb heat from cryogenic object, and transfers energy to the device of high temp objects.During refrigeration, indoor heat converter absorbs heat as vaporizer, by refrigeration agent, heat is drained into outdoor, and outdoor heat exchanger uses as condenser.When heating, outdoor heat converter uses as vaporizer and absorbs heat, and by refrigeration agent, heat is delivered to indoor, indoor heat converter is as condenser release heat.Because heat pump type air conditioner effectively can utilize the low-phase energy extensively existed, and save the limited high-order energy, its development receives increasing concern.
Be specifically described for the four-way change-over valve in heat pump type air conditioner below.In heat pump type air conditioner, four-way change-over valve is cooling system state of cyclic operation and the critical component heating state of cyclic operation and change, and by the switching of four-way change-over valve, realizes the mutual conversion of refrigerating/heating.Four-way change-over valve mainly contains electromagnetic coil, pilot valve and main valve composition, and main valve commutation under the acting in conjunction of electromagnetic coil and pilot valve switches the circulating direction of refrigeration working medium, realizes the mutual conversion of air conditioner refrigerating/heat.
From the working principle of four-way valve, no matter be heating state or refrigerating state, in main valve, can be flowed high temperature and high pressure gas and low temperature low pressure gas simultaneously, when there is high temperature and high pressure gas and low temperature low pressure gas at the same time, always have some heats and flow to the other end from one end of valve seat, cause loss and the waste of heat, therefore, in order to improve energy transmission efficiency and meet environmental requirement more and more higher on market, need a kind of seat material of selector valve that there is more environmental protection and there is better heat-shielding performance.In order to reduce the loss that this part heat transfer shape is risen, application number as the applicant's application is the valve seat that just have employed a kind of new material in the application for a patent for invention of 200810170546.6, this valve seat has lower pyroconductivity, and the heat conduction loss therefore caused by this position can reduce.In addition, if adopt stainless steel, stainless iron and other iron and steel class or other relatively do not allow transcalent material, heat transfer loss can reduce further, but use these class valve seats such as stainless steel, bring again the problem of machine cut processing relative difficulty, and process relatively time-consuming, tool wear is also easy especially in addition, thus causes the secondary process expenses such as cutter relatively large.
Summary of the invention
For this reason, the present invention is directed to the technical problem of this contradiction between above-mentioned machine cut processing relative difficulty and heat transfer loss, adopt a kind of seat material with better environmental-protecting performance and heat-shielding performance, and a kind of new processing mode, a kind of new four-way change-over valve is provided, the present invention specifically by the following technical solutions:
A kind of four-way change-over valve, comprise valve body, valve seat, with valve body, multiple adapters that valve seat is fixing together, described adapter and valve body, valve seat is fixing by being welded to connect, described valve seat comprises a sealed department sealed for matching with the slide block of four-way change-over valve and one joint for being connected with described adapter, described sealed department has a sealing surface, described joint is provided with adapter hole, described adapter hole form a stepped part for the position of inserting adapter is greater than the position of the sealing surface of the close sealed department in described adapter hole, the length along described valve body longitudinal direction of the sealed department of described valve seat is greater than the length in this direction of described joint, described valve seat is shaped by powder injection.
Preferably, described valve seat is the metal of low heat conduction, metal alloy or nonmetallic material are shaped by powder injection.
Preferably, described valve seat is that the dusty material of stainless steel, stainless iron or pottery is shaped by injection.
Optionally, described valve body material is stainless steel material.Like this, the valve body of four-way change-over valve and valve seat, take between tunnel furnace stove can be adopted to weld, thus the pickling after welding or cleaning can be avoided, and environmental protection more.
Preferably, the thickness (σ) of the faying surface of fitting for described valve body of the joint of described valve seat (comprises 1mm, 2.5mm) between 1-2.5mm.More suitable, the thickness (σ) of the faying surface of fitting for described valve body of the joint of described valve seat (comprises 1.2mm, 2mm) between 1.2-2mm
Optionally, the outer wall of the joint of described valve seat is linear, parabolic shape, arc line type or combination.
Optionally, the outer wall of the joint of described valve seat is comprising linear, and the angle formed between the described outer wall of coil part and the sealing surface of the sealed department of described valve seat (comprises 75 °, 90 °) between 75-90 °.
Preferably, the positions between two wherein adjacent adapter holes of the joint of described valve seat are also provided with separating part, make described valve seat take over each the adapter hole that coordinates and surrounding is independent forms laminating and sprawl face.
Preferably, described valve body, valve seat, adapter are welded and fixed by tunnel furnace stove.
Preferably, the sealing surface of the described sealed department of valve seat, after injection shapes, by abrasive machining before assembling with described slide block, particularly, as carried out grinding to ensure planeness, the degree of finish of sealing surface by emery wheel; Also cast iron plate can be adopted in addition to grind ensure.
In addition, the present invention is the claimed valve seat relevant with above-mentioned four-way change-over valve also, and described valve seat is processed by powder injection forming.
The present invention is by adopting power injection molding to process valve seat, compared with carrying out cutting with original employing irregular section bar, materials'use amount can obviously reduce, and structure can also be configured as the shape of special construction, thus the surface of contact that can reduce when valve seat welds with four-way change valve, reduce the flow area of solder during welding, thus ensure welding quality.And the various powder that thermal conductivity can be used lower due to valve seat processing mode provided by the invention process, therefore can reduce the heat loss between high/low temperature refrigerant, effectively improve the energy-saving effect of air-conditioning.
Further, four-way change-over valve of the present invention, by the change of seat material; after valve body material being changed into stainless steel simultaneously, protection can be carried out by tunnel furnace when both weld with adapter and weld, like this; eliminate the operations such as the pickling after welding, cleaning, therefore environmental protection more.
Accompanying drawing explanation
The schematic perspective view of a kind of mode of execution of the valve seat of Fig. 1 four-way change-over valve provided by the invention;
Fig. 2 is the plan view of valve seat shown in Fig. 1;
Fig. 3 is the valve body of the four-way change-over valve of a kind of mode of execution provided by the invention and valve seat, take over fixing after structural representation;
Fig. 4 is the schematic perspective view of the second mode of execution of the valve seat of four-way change-over valve provided by the invention;
Fig. 5 is the plan view of valve seat shown in Fig. 4;
Fig. 6 is the left view of valve seat shown in Fig. 4;
The valve body of the four-way change-over valve of Fig. 7 the second mode of execution provided by the invention and valve seat, take over fixing after structural representation.
Embodiment
In order to understand the present invention further, below in conjunction with specific embodiment, optimal technical scheme of the present invention is specifically described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
The invention provides a kind of seat material, for solenoid valve or the selector valve of air-conditioning or refrigeration system, as a kind of four-way change-over valve (sometimes also referred to as electromagnetism four-way change-over valve or selector valve) of idle call.Lower mask body is specifically described for four-way change-over valve.
Fig. 1 is the schematic perspective view of a kind of mode of execution of the valve seat of four-way change-over valve provided by the invention, and Fig. 2 is the plan view of valve seat shown in Fig. 1, Fig. 3 is the valve body of the four-way change-over valve of this mode of execution and valve seat, take over fixing after structural representation.As shown in the figure, four-way change-over valve comprises valve body 1, valve seat 2, first adapter 3, second adapter 4, the 3rd adapter 5 and high-voltage tube 6; Wherein high-voltage tube 6 be fixed on valve body with the relative side of described valve seat 2; Other three adapters 3,4,5 are located by valve body 1, valve seat 2 extending in the attachment hole of valve seat and are passed through welding sealing is fixing mutually.
In addition, illustratively, the adapter mentioned in the present invention refers to three of being connected with valve body, valve seat and takes over: the first adapter 3, second adapter 4, the 3rd adapter 5, and does not comprise the high-voltage tube 6 be only connected with valve body.And the present invention relates generally to valve body, adapter and valve seat.Particularly, valve seat 2 comprise the sealed department 23 that matches with the slide block of four-way change-over valve (not shown in FIG.) with and valve body, take over the joint matched, joint comprises takes over hole for inserting three of being welded and fixed with three adapters 3,4,5, adapter is provided with a stepped part 25 in hole, places welding consumables and locate when inserting adapter during for welding; The sectional shape for the width direction at position of fitting with valve body of the joint of valve seat 2 is the cambered surfaces of closing with the matching form of the endoporus of valve body 1, particularly, valve seat is that the faying surface 22 that the cambered surface of closing with the matching form of the endoporus of valve body 1 forms fits with the endoporus of valve body or substantially fits by its sectional shape; In present embodiment, the faying surface of valve seat 2 links together, and the width beta of the faying surface wherein formed between two of arbitrary neighborhood adapter holes is greater than the width cs of the faying surface of both sides.Wherein the scope of the width cs of the faying surface of both sides is between 1mm-2.5mm, if the width cs of faying surface is less than 1mm, valve seat 2 can be made on the low side with the weld strength of valve body 1; And if the width cs of faying surface is greater than 2.5mm, then makes laminating spreading area during the welding of valve seat 2 and valve body 1 excessive, and cause welding consumables flow area excessive, also can reduce soldering reliability.Be more preferably, the scope of the width cs of faying surface is between 1.2mm-2mm.In like manner, the scope of the width beta of the faying surface formed between two adapter holes is between 1.5-2.5mm.
In addition, in present embodiment, the sealed department 23 of valve seat 2 is roughly rectangle, and the length of the sealed department of valve seat 2 is greater than the length of joint, can save the use amount of seat material like this; The outer wall 22 of joint is almost parallel with the center line in adapter hole, is namely substantially vertical state with the sealing surface 24 coordinated with slide block of sealed department 23.
In order to make valve seat, there is enough intensity, and make the width cs of faying surface relatively little, the center line of the outer wall 22 and adapter hole that also can be designed to joint is not in addition in parastate, but intersection, namely with the angle [alpha] that the sealing surface 24 coordinated with slide block of sealed department 23 is 75 ~ 90 °, that is: 75≤α≤90 °.Like this, the width cs of faying surface is relatively little, and the base portion of the close sealed department of joint is relatively large, can ensure the mechanical strength of valve seat.In addition, the outer wall 22 of joint can also be designed to a parabolic shape, arc line type or various forms of combination; Because valve seat adopts powder injection to shape, therefore the processing of various shape is all relatively simple, and can not carry out as original employing section bar being subject to various restriction machine cut processing.
In present embodiment, valve seat is processed by powder injection mode, particularly, by pressed powder and organic binder Homogeneous phase mixing, after granulating, with injection molding machine, bulk material is injected die cavity internal shaping, and then sinter, the component of required form can be obtained; Also casting forming can be adopted in addition to process.The material required for as long as the material needed for each like this valve seat is just shaped, and compared with carrying out cutting with original section bar, raw material are used to reduce.Preferably, seat material adopts stainless steel.For stainless steel, the present invention is without particular limitation, can be Cr system (SUS400) stainless steel, Cr-Ni system (SUS300) stainless steel, Cr-Mn-Ni (SUS200) stainless steel and precipitation hardening (SUS600) stainless steel.Preferably, be Cr-Ni system (SUS300) stainless steel, as the stainless steel of the trades mark such as SUS301, SUS302, SUS303, SUS304, SUS309, SUS316, SUS316L.Stainless iron and other high strength, heat resistance can also be used in addition good and the metallic material that heat-transfer coefficient is relatively low and nonmetallic material as stupalith.Concrete processing mode is as follows: shaped by injection by valve seat before this, arranges welding consumables as weldering circle in the stepped part in multiple adapter holes of valve body 1, then by valve seat 2 and valve body 1, nozzle assembling to together with and builtup member is welded and fixed by tunnel furnace.In order to ensure the matching property of valve seat and slide block, the sealing surface 24 of valve seat can be carried out grinding or grinding.In addition also can by the sealing surface of the valve seat welded being carried out abrasive machining to ensure the degree of finish of sealing surface thus can coordinate well with slide block after having welded.In addition, in the present embodiment, the material of the valve body 1 of four-way change-over valve can adopt original brass class material, but is preferably stainless steel, can reduce the heat transfer loss of four-way change-over valve so further.
The miscellaneous part of the four-way change-over valve in present embodiment similarly to the prior art, is no longer repeated here.
Introduce another embodiment of the present invention below, Fig. 4 is the schematic perspective view of the second mode of execution of the valve seat of four-way change-over valve provided by the invention, Fig. 5 is the plan view of valve seat shown in Fig. 4, Fig. 6 is the left view of valve seat shown in Fig. 4, Fig. 7 is the valve body of the four-way change-over valve of this mode of execution and valve seat, take over fixing after structural representation.As shown in the figure, in order to make welding quality more reliable, in this mode of execution, further control is carried out to the faying surface of valve seat and valve body, as shown in the figure, the main distinction of present embodiment and above-mentioned mode of execution is: in order to make valve seat and valve body, the welding quality of adapter is more reliable and more stable, the valve seat of present embodiment is provided with a separating part 222 between the joint of adapter, namely a groove is utilized to be separated the attachment portion that adjacent two are taken over, this further reduces the laminating spreading area of valve seat and valve body, and it is topmost, or the welding consumables be arranged on when welding in the stepped part in each adapter hole flows in respective laminating spreading area respectively, such as, be arranged on the welding consumables of the stepped part in the adapter hole of the first adapter as weldering circle, its contacting with first or having certain closely spaced inwall position just in first of valve seat the adapter hole when flowing is melted in welding by temperatures involved, flowing with the faying surface position of valve body of the periphery in hole is taken over to first of valve seat, and can not interfere by separating part 222 and the second welding consumables taking over hole or interact, namely each defining relatively independent welding part and can not flow effect mutually, can avoid so the local welding consumables of part may being caused when sometimes adding wrong difference in man-hour on the high side and the local this situation on the low side of part, improve the uniformity of welding consumables, thus the total pass rate level of welding can be improved.In addition, the separating part existed between adjacent two adapters does not have metallic material, can reduce the heat trnasfer between these two adjacent adapters.Equally, the periphery in each adapter hole of valve seat and the wall thickness range σ at faying surface place of valve body between 1-2.5mm, be more preferably, between 1.2-2mm.
Similarly, the outer wall of joint 221 can be almost parallel with the center line in adapter hole, is namely substantially vertical state with the sealing surface 24 coordinated with slide block of sealed department 23.
Also enough intensity can be had in order to make valve seat, and make the width cs of faying surface relatively little, and the center line of the outer wall 221 and adapter hole that are designed to joint is not in parastate, but intersection, as faying surface position is relatively little, the straight line type that base portion is relatively large, parabolic shape, arc line type and other various shape or combination, as with the sealing surface 24 coordinated with slide block of sealed department 23 angle [alpha] in 75 ~ 90 °, that is: 75≤α≤90 °, like this, the width cs of faying surface is relatively little, and the base portion of the close sealed department of joint is relatively large, the mechanical strength of valve seat can be ensured.
Other parts of four-way change-over valve of the present invention, structure are same as the prior art, and concrete processing, using method are well known to those skilled in the art, and just repeat no more at this.
The present invention simultaneously also above-mentioned employing powder injection of claimed use shapes the valve seat manufactured by this processing method.
Valve seat of the present invention can also be used for solenoid valve, and as being air conditioner, refrigerator solenoid valve used, described air-conditioning can be single cold air-conditioning, heat pump air conditioner, preferably, is particularly suitable for the four-way change-over valve in air conditioner.
The present invention is shaped by powder injection, easy to process, use material relatively will lack, and the valve seat of various shape relative complex can be processed, compared with the stack valve seat be made up of top valve seat and lower valve seat of the prior art, the energy-saving effect of further raising four-way change-over valve and valve seat, but process convenient, performance is more reliable and more stable.Be particularly suitable for adopting some machine cut to process the material of relatively difficulty as materials such as stainless steel, stainless iron, potteries, these materials have relatively low pyroconductivity and be no more than 30w/mk as stainless heat conductivitys.Like this, significantly can be reduced from high pressure-temperature chamber to the heat transfer loss of low aluminium hydraulic pressed connecting pipe by valve seat location, namely reduce the heat transfer loss of valve seat, also reduce the heat transfer loss of four-way change-over valve, improve the Energy Efficiency Ratio of system.
Discuss from above, adopt the valve seat of four-way change-over valve provided by the invention, the welding quality of valve seat and valve body can be improved, obviously can also reduce thermal loss, can reduce in operation of air conditioner process the first adapter, second adapter, the 3rd adapter position high/low temperature refrigerant between heat loss, effectively improve the energy-saving effect of air-conditioning.
Equally, seat material of the present invention also can be used on the valve seat of the solenoid valve used in the systems such as refrigeration or HVAC, because the solenoid valve used in these systems, the inner fluid circulated exists the temperature difference during in the both sides of solenoid valve, all heat transfer loss can be produced because of the heat transfer of valve seat; The requirement of the environmental protection aspect of brass material simultaneously used in these systems is also all more and more higher.And specifically process, using method is well known to those skilled in the art, just repeat no more at this.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a four-way change-over valve, comprise valve body, valve seat, with valve body, multiple adapters that valve seat is fixing together, described adapter and valve body, valve seat is fixing by being welded to connect, described valve seat comprises a sealed department sealed for matching with the slide block of four-way change-over valve and one joint for being connected with described adapter, described sealed department has a sealing surface, described joint is provided with adapter hole, described adapter hole form a stepped part for the position of inserting adapter is greater than the position of the sealing surface of the close sealed department in described adapter hole, it is characterized in that: the length along described valve body longitudinal direction of the sealed department of described valve seat is greater than the length in this direction of described joint, the outer wall of the joint of described valve seat is arc line type, described valve seat is the metal of low heat conduction, metal alloy or nonmetallic material are shaped by injection or die-casting process is shaped.
2. four-way change-over valve according to claim 1, it is characterized in that described valve seat be stainless steel, stainless iron or pottery dusty material by after granulation again injection shape.
3., according to claim 1-2 wherein arbitrary described four-way change-over valve, it is characterized in that described valve body material is stainless steel material.
4. four-way change-over valve according to claim 3, is characterized in that the thickness σ for the faying surface of fitting with described valve body of the joint of described valve seat meets: 1≤σ≤2.5mm.
5. four-way change-over valve according to claim 4, is characterized in that the outer wall of the joint of described valve seat is comprising linear, and the angle [alpha] formed between the sealing surface of the outer wall of described linear part and the sealed department of described valve seat meets: 75≤α≤90 °.
6. according to claim 1,2 wherein arbitrary described four-way change-over valve, positions between wherein adjacent two the adapter holes that it is characterized in that the joint of described valve seat are also provided with separating part, make described valve seat take over each the adapter hole that coordinates and surrounding is independent forms laminating and sprawl face.
7., according to claim 1,2 wherein arbitrary described four-way change-over valve, it is characterized in that described valve body, valve seat, adapter is welded and fixed by tunnel furnace stove.
8. four-way change-over valve according to claim 7, is characterized in that the sealing surface of the described sealed department of valve seat, after injection shapes, by grinding or grinding before assembling with described slide block.
9. the four-way change-over valve according to any one of claim 1-2, is characterized in that, described valve seat is shaped forms by carrying out injection moulding processing or die-casting process after granulating powders again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010137681.8A CN102200190B (en) | 2010-03-25 | 2010-03-25 | Four-way reversing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010137681.8A CN102200190B (en) | 2010-03-25 | 2010-03-25 | Four-way reversing valve |
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| Publication Number | Publication Date |
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| CN102200190A CN102200190A (en) | 2011-09-28 |
| CN102200190B true CN102200190B (en) | 2014-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010137681.8A Active CN102200190B (en) | 2010-03-25 | 2010-03-25 | Four-way reversing valve |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398210A (en) * | 2013-08-21 | 2013-11-20 | 苏州工业园区依利电子贸易有限公司 | Four-way valve assembly |
| CN106246956B (en) * | 2015-06-15 | 2018-08-31 | 株式会社鹭宫制作所 | Slidingtype switching valve and refrigerating circulation system |
| CN105090556B (en) * | 2015-09-11 | 2017-08-29 | 何珠华 | Electromagnetism four-way reversing valve main valve seat, manufacture method and electromagnetism four-way reversing valve |
| CN108930816B (en) * | 2017-05-23 | 2021-04-06 | 浙江三花制冷集团有限公司 | Reversing valve and manufacturing method thereof |
| CN108361412A (en) * | 2017-11-23 | 2018-08-03 | 宁萌 | A kind of way Reversing Valve for Air-Condition master（It leads）Valve |
| CN112222669B (en) * | 2020-12-09 | 2021-03-16 | 中国空气动力研究与发展中心超高速空气动力研究所 | Welding seam structure and manufacturing method thereof |
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| JP2856948B2 (en) * | 1990-06-08 | 1999-02-10 | トライテン・コーポレーシヨン | Switching valve |
| EP0969234A1 (en) * | 1998-06-30 | 2000-01-05 | Fujikin Incorporated | Fluid control device |
| JP3084390B2 (en) * | 1992-12-18 | 2000-09-04 | 太平洋工業株式会社 | Four-way switching valve |
| CN101319726A (en) * | 2007-06-04 | 2008-12-10 | 浙江三花制冷集团有限公司 | Macrotype four-way reversing valve |
| JP4294683B2 (en) * | 2006-12-19 | 2009-07-15 | 日立アプライアンス株式会社 | Four-way switching valve and air conditioner using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2856948B2 (en) * | 1990-06-08 | 1999-02-10 | トライテン・コーポレーシヨン | Switching valve |
| JP3084390B2 (en) * | 1992-12-18 | 2000-09-04 | 太平洋工業株式会社 | Four-way switching valve |
| EP0969234A1 (en) * | 1998-06-30 | 2000-01-05 | Fujikin Incorporated | Fluid control device |
| JP4294683B2 (en) * | 2006-12-19 | 2009-07-15 | 日立アプライアンス株式会社 | Four-way switching valve and air conditioner using the same |
| CN101319726A (en) * | 2007-06-04 | 2008-12-10 | 浙江三花制冷集团有限公司 | Macrotype four-way reversing valve |
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Effective date of registration: 20170220 Address after: 312500 Shaoxing City, Zhejiang province Xinchang Qixing street under the Liquan Patentee after: Zhejiang three flower intelligent control Limited by Share Ltd Address before: 312500 Liquan village of Zhejiang County in Xinchang Province town under Patentee before: Sanhua Refrigeration Group Co., Ltd., Zhejang |