CN102758941B - A kind of chiller plant and one-way valve thereof - Google Patents
A kind of chiller plant and one-way valve thereof Download PDFInfo
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- CN102758941B CN102758941B CN201110110799.6A CN201110110799A CN102758941B CN 102758941 B CN102758941 B CN 102758941B CN 201110110799 A CN201110110799 A CN 201110110799A CN 102758941 B CN102758941 B CN 102758941B
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- 238000000034 method Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 15
- 230000009467 reduction Effects 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Multiple-Way Valves (AREA)
Abstract
The invention discloses a kind of one-way valve, comprise valve body (1), valve seat (2) and spool (3), in described valve seat (2), be provided with back-up ring (4); Also comprise the guide element (5) that the described spool of guiding (3) is moved along the longitudinal center line of described one-way valve; Described guide element (5) is fixedly connected with the one in described back-up ring (4) with described spool (3), is slidably connected with another one.Guide element (5) is set in valve seat (2), spool (3) is only moved in one degree of freedom from all removable the becoming of three degree of freedom, namely only center line moves back and forth vertically, avoid spool (3) to occur the phenomenon of tilted upward, thus ensure that the working stability of spool.The present invention also discloses a kind of chiller plant, comprises compressor; Also comprise above-mentioned one-way valve, described one-way valve is connected to the outlet pipe of described compressor, and this chiller plant has corresponding technique effect.
Description
Technical field
The present invention relates to technical field of refrigeration equipment, particularly relate to a kind of one-way valve for chiller plant.The invention still further relates to a kind of chiller plant comprising above-mentioned one-way valve.
Background technique
Chiller plant is refrigerating operation equipment used, most widely used is compression refrigeration equipment at present, steam compression type refrigerating apparatus and gas compression refrigeration equipment can be divided into again by refrigeration kind, mainly rely on the effect of compressor to improve the pressure of refrigeration agent to realize refrigeration cycle.
One-way valve is the vitals in chiller plant, is installed on the exhaust ports of the compressor of chiller plant, compressor reverse rotation during for preventing from shutting down, or prevents refrigeration agent from flowing to from the compressor of running the compressor do not operated.
Please refer to Fig. 1, Fig. 1 is the structural representation of one-way valve in prior art.Briefly introduce the defect that this one-way valve exists in the course of the work below.
In prior art, as shown in Figure 1, conventional one-way valve comprises valve body 1 ', valve seat 2 ', spool 3 ' and back-up ring 4 '.During work, spool 3 ' moves back and forth under the effect of both sides pressure reduction, reaches the object of closedown or open check valve.
But, because existing one-way valve location relies on spool 3 ' to position relative to reciprocatingly sliding of valve seat 2 ', in working procedure, impurity in medium is usually blocked between spool 3 ' and the inwall of valve seat 2 ', not stuck by impurity in moving process in order to ensure spool 3 ', must add the gap between big valve core 3 ' and valve seat 2 ' inwall, this just causes after repeatedly opening and closing, spool 3 ' there will be tilted upward, the unstable phenomenon such as to misalign with valve seat 2 ', makes the reliability decrease of product.
In addition, the opening and closing of existing one-way valve relies on the pressure reduction on spool 3 ' both sides to promote spool 3 ' to-and-fro motion, after spool 3 ' is opened, if the pressure reduction on both sides is too little, the phenomenon that spool 3 ' cannot reset, spool 3 ' cannot be closed will be caused, thus cause the refrigerant abnormal flow of whole system, cause compressor to be scrapped time serious.
Therefore, how on the basis of existing technology, improving the structure of existing one-way valve, make spool and valve seat centering, stable operation all the time, and have the effective feature of valve core reset, is the current urgent problem of those skilled in the art.
Summary of the invention
The technical problem to be solved in the present invention is for providing a kind of one-way valve for chiller plant, and this non-return valve operational is stablized, spool all the time vertically the direction of center line move, and there is the effective feature of valve core reset.Another technical problem that the present invention will solve is for providing a kind of chiller plant comprising above-mentioned one-way valve.
For solving the problems of the technologies described above, the invention provides a kind of one-way valve, comprising valve body, valve seat and spool, in described valve seat, be provided with back-up ring; Also comprise the guide element that the described spool of guiding moves along the longitudinal center line of described one-way valve; Described guide element is fixedly connected with the one in described back-up ring with described spool, is slidably connected with another one.
Preferably, described guide element is directional post, and one end of described directional post is plugged in described back-up ring, and its other end is fixedly connected with described spool; And described directional post and described valve seat, described spool centering.
Preferably, described directional post and described spool are injected into one.
Preferably, described spool comprises head and afterbody, and described tail support in the diapire of described valve seat, and and has gap between the roof of described valve seat.
Preferably, outside the part of described directional post between described spool and described back-up ring, be set with spring, and when described one-way valve closes, described spring is in compressive state.
Preferably, the two ends of described spring are connected with described spool, described back-up ring respectively.
Preferably, the thickness range of described back-up ring is 2mm to 5mm.
Preferably, the cross section of described back-up ring is star structure, and described directional post is plugged in the center of described star structure.
Preferably, described guide element is multiple position-limited levers be arranged in parallel, and the two ends of multiple described position-limited lever connect described valve seat and described back-up ring respectively; In the radial direction of described one-way valve, described spool is connected in the inside of multiple described position-limited lever.
One-way valve provided by the present invention, comprises valve body, spool, valve seat and back-up ring, also comprises the guide element that Pilot poppet is moved along the longitudinal center line of one-way valve; Guide element is fixedly connected with the one in back-up ring with spool, is slidably connected with another one.
Adopt such structure, under the leading role of guide element, spool only moves in one degree of freedom from all removable the becoming of three degree of freedom in the course of the work, namely only center line moves back and forth vertically, compared with prior art, avoid spool to occur tilted upward, the unstable phenomenon such as to misalign with valve seat, substantially increase the functional reliability of product.
In the mode of execution that another kind is concrete, the outer cover of the part between spool and back-up ring of directional post is equipped with spring, and when one-way valve closes, spring is in compressive state.Adopt such structure, after spool opens one-way valve under differential pressure action, even if the pressure of spool both sides is equal, or the pass valve pressure of spool is a bit larger tham the cracking pressure of spool, rely on the elastic force of spring, spool still can reply mobile, closing one-way valve, makes the better reduction of one-way valve.In addition, when the pass valve pressure of this one-way valve is greater than cracking pressure, and when pressure reduction is larger, reply in moving process at spool, due to the elastic force of spring, make spool with valve seat, unexpected, fierce collision can not occur, serve the effect of buffering.
The present invention also provides a kind of chiller plant, comprises compressor; Also comprise foregoing one-way valve, described one-way valve is connected to the outlet pipe of described compressor.
Because above-mentioned one-way valve has above-mentioned technique effect, therefore, the chiller plant comprising this one-way valve also should have corresponding technique effect, does not repeat them here.
Accompanying drawing explanation
Fig. 1 is the structural representation of one-way valve in prior art;
Fig. 2 is the structural representation of a kind of embodiment of one-way valve provided by the present invention;
Fig. 3 is one-way valve in Fig. 2 structural representation when being in valve port open position;
Fig. 4 is the partial enlarged drawing of the spool installation place in Fig. 2;
Fig. 5 is the sectional view of spool in Fig. 2 and valve seat joint;
Fig. 6 is the structural representation of the another kind of embodiment of one-way valve provided by the present invention;
Fig. 7 is the side view that the valve seat in Fig. 6 is connected with spool;
Fig. 8 is the structural representation of the third embodiment of one-way valve provided by the present invention;
Fig. 9 is the side view that the valve seat in Fig. 8 is connected with spool;
Figure 10 is the structural representation of a kind of embodiment of back-up ring in Fig. 2;
Figure 11 is the structural representation of the another kind of embodiment of back-up ring in Fig. 2.
Wherein, the reference character in Fig. 1 and the corresponding relation between component names are:
1 ' valve body; 2 ' valve seat; 3 ' spool; 4 ' back-up ring;
Reference character in Fig. 2 to Figure 11 and the corresponding relation between component names are:
1 valve body; 2 valve seats; 21 diapires; 22 roofs; 3 spools; 31 afterbodys; 32 heads; 4 back-up rings; 5 guide elements; 6 springs.
Embodiment
Core of the present invention is for providing a kind of one-way valve for chiller plant, and this non-return valve operational is stablized, spool and valve seat centering all the time, and has the effective feature of valve core reset.Another core of the present invention is for providing a kind of chiller plant comprising above-mentioned one-way valve.
In order to make those skilled in the art understand technological scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 2 and Fig. 3, Fig. 2 is the structural representation of a kind of embodiment of one-way valve provided by the present invention; Fig. 3 is one-way valve in Fig. 2 structural representation when being in valve port open position.
In a kind of concrete mode of execution, as shown in Figures 2 and 3, one-way valve provided by the present invention, it comprises valve body 1, valve seat 2, spool 3, back-up ring 4 and guide element 5; Valve body 1 is located at the outside of one-way valve, is the pipeline of media flow; Valve seat 2 is located at the inside of valve body 1, and can be fixedly connected with valve body 1 by the mode of cutting, valve seat 2 is provided with the valve port of one-way valve; Spool 3 is located at the inside of valve seat 2, and spool 3 moves back and forth according to the pressure difference of its both sides, thus realizes close port or open valve port; Back-up ring 4 is located at the inside of valve seat 2, for limiting the maximum displacement of spool 3; Guide element 5 is for the motion of Pilot poppet 3, and its longitudinal center line along one-way valve is moved, and this guide element 5 is fixedly connected with the one in back-up ring 4 with spool 3, is slidably connected with another one.
In preferred scheme, above-mentioned guide element 5 can be directional post, this directional post cross setting, and its one end is plugged in the center of back-up ring 4, and its other end is connected with spool 3, and this directional post and valve seat 2, spool 3 centering are arranged.
Adopt the structure connecting directional post between spool 3 and back-up ring 4, in the course of the work, spool 3 moves back and forth along with the pressure difference of both sides, directional post is driven to reciprocatingly slide in back-up ring 4, due to directional post and valve seat 2, spool 3 centering, ensure that spool 3 moves horizontally all the time, thus avoid spool 3 to occur tilted upward, the unstable phenomenon such as to misalign with valve seat 2, substantially increase the functional reliability of product.
As can be seen here, arrange guide element 5 in valve seat 2, spool 3 is become only in one degree of freedom motion from three degree of freedom is all removable, and namely only center line moves back and forth vertically, thus ensure that the working stability of spool 3.
It should be noted that, do not limit the specific constructive form of guide element 5 in above-described embodiment, except directional post, can also be other structural types.Also do not limit the concrete Placement of directional post and spool 3, in fact, between every spool 3 and back-up ring 4, connect guide element 5, the one-way valve of spool 3 movement in horizontal plane all the time can be made, all in protection scope of the present invention.
The Placement of above-mentioned directional post and spool 3 can also be set further.
In the mode of execution that another kind is concrete, above-mentioned directional post and spool 3 can injection moulding in being integrated.Injection moulding is the common method of production moulding in industrial products, make the end product shape that can obtain spool 3 and directional post in this way, no longer need other processing before using in installation or as final finished, and there is the advantages such as structure is simple, easy to process.Certainly, not limiting the concrete grammar of injection moulding here, can be rubber injection mold, also can be rubber injection mold.
In addition, above-mentioned directional post and spool 3 can also with bolts, rivet, or to connect by other the mode such as Bond bonding.
The specific constructive form of above-mentioned spool 3 can also be set further.
Please refer to Fig. 4 and Fig. 5, Fig. 4 is the partial enlarged drawing of the spool installation place in Fig. 2; Fig. 5 is the sectional view of spool in Fig. 2 and valve seat joint.
In the mode of execution that another kind is concrete, as shown in Figure 4 and Figure 5, above-mentioned spool 3 comprises head 32 and afterbody 31, and wherein the cross section of afterbody 31 can be irregularly shaped, the afterbody 31 of spool 3 is supported in the diapire 21 of valve seat 2, and and has gap between the roof 22 of valve seat 2.Adopt such structure, spool 3 is when moving back and forth, and afterbody 31 is supported on valve body 1, and the end that directional post can be prevented to be connected with spool 3 due to gravity generation vertical displacement, thus increases the working stability of spool 3; Spool 3 top and spool 3 gap are comparatively large, can prevent impurity from blocking, avoid spool 3 stuck by impurity, play the effect increasing one-way valve flow simultaneously.In addition, adopt the spool 3 of this structure to reduce material, reduce the cost of production of one-way valve.
Special instruction, " head " refers to the part participating in shutoff valve port in spool 3; " afterbody " refers to the part not participating in shutoff valve port in spool 3; " roof " refers to the top of valve seat 2 in accompanying drawing 4; " diapire " refers to the bottom of valve seat 2 in accompanying drawing 4; be to be understood that; these component names are set up for benchmark with accompanying drawing herein, and their appearance should not affect protection scope of the present invention.
The specific constructive form of above-mentioned guide element 5 can also be set further.
Please refer to Fig. 6 and Fig. 7, Fig. 6 is the structural representation of the another kind of embodiment of one-way valve provided by the present invention; Fig. 7 is the side view that the valve seat in Fig. 6 is connected with spool.
In the mode of execution that another kind is concrete, as shown in Figure 6 and Figure 7, above-mentioned guide element 5 is multiple position-limited levers be arranged in parallel, two ends connecting valve seat 2 and the back-up ring 4 respectively of multiple position-limited lever; In the radial direction of one-way valve, spool 3 is connected in the inside of multiple position-limited lever.
Particularly, the cross section of spool 3 is circular; Guide element 5 can be three position-limited levers being located between valve seat 2 and back-up ring 4, and three is evenly arranged along the circumference of one-way valve; Spool 3 is located at the inside of three described position-limited levers, and the periphery wall of spool 3 all contacts with three described position-limited levers.
Adopt such structure, three position-limited levers are coated on the outside of spool 3, form the guide channel of spool 3, spool 3 can only be moved along the direction of the longitudinal center line of one-way valve, spool 3 tilted upward in the course of the work can be avoided, meanwhile, because position-limited lever is thinner, make the one-way valve of this structure also have the larger technique effect of flow, the cross section that this structure is suitable for spool 3 is circular one-way valve.
Certainly, except the motion of above-mentioned employing 3 position-limited lever Pilot poppet 3, other mode can also be adopted.It is the structural representation of the third embodiment of one-way valve provided by the present invention please also refer to Fig. 8 and Fig. 9, Fig. 8; Fig. 9 is the side view that the valve seat in Fig. 8 is connected with spool.As shown in the figure, when the afterbody cross section of spool 3 is square, guide element 5 can be four position-limited levers being located between valve seat 2 and back-up ring 4, and four are evenly arranged along the circumference of one-way valve; Spool 3 is located at the inside of four position-limited levers, and the periphery wall of spool 3 all contacts with four position-limited levers.
Similar with said structure, adopt this structure, spool 3 can be made equally only to move along the direction of the longitudinal center line of one-way valve, avoid tilted upward in the course of the work, and this one-way valve also has the larger technique effect of flow.
Certainly, above-mentioned guide element 5 is not limited to above-mentioned three kinds of structural types, can also be other specific constructive form, such as, by structural types such as above-mentioned locating column and position-limited lever combine.
The specific constructive form of above-mentioned one-way valve can also be set further.
In the mode of execution that another kind is concrete, as shown in Figures 2 and 3, the outside of the part of directional post between spool 3 and back-up ring 4 can be set with spring 6, and when one-way valve closes, spring 6 is in compressive state.
Adopt such structure, after spool 3 opens one-way valve under differential pressure action, even if the pressure of spool 3 both sides is equal, or the pass valve pressure of spool 3 is a bit larger tham the cracking pressure of spool 3, rely on the elastic force of spring 6, spool 3 still can reply mobile, closing one-way valve, makes the better reduction of one-way valve.In addition, when the pass valve pressure of this one-way valve is greater than cracking pressure, and when pressure reduction is larger, reply in moving process at spool 3, due to the elastic force of spring 6, make spool 3 with valve seat 2, unexpected, fierce collision can not occur, serve the effect of buffering.
The annexation of above-mentioned spring 6 and spool 3, back-up ring 4 can also be set further.
In scheme more specifically, above-mentioned spring 6 can be set to that one end is not connected with spool 3, the other end is not also connected with back-up ring 4, namely spring 6 is only the spring 6 being set in directional post outside, and it is simple that such one-way valve has structure, and installation and removal feature all easily.
Above-mentioned spring 6 can also be set to one end and be connected with spool 3, and the other end is connected with back-up ring 4, when the internal diameter of spring 6 differs slightly large with the internal diameter of directional post, adopt the structure that two ends are fixedly connected with, spring 6 in the vertical direction in the process elongated or shortened can be avoided to misplace, thus ensure spring 6 frank and outspoken stretching in horizontal plane all the time, further enhancing the stability that spring 6 works.Certainly, above-mentioned spring 6 is not limited to above-mentioned Placement, can also be set to one end and be connected with spool 3, or only one end is connected with back-up ring 4.
The specific constructive form of above-mentioned back-up ring 4 can also be set further.
Please refer to Figure 10 and Figure 11, Figure 10 is the structural representation of a kind of embodiment of back-up ring in Fig. 2; Figure 11 is the structural representation of the another kind of embodiment of back-up ring in Fig. 2.
In the mode of execution that another kind is concrete, the thickness range of above-mentioned back-up ring 4 can be 2mm to 5mm.When the thickness of back-up ring 4 is less than 2mm, because thickness is too little, the effect of location can not be played, the poor stability of spool 3 can be caused, simultaneously due to too thin, cause the difficulty of processing larger; When the thickness of back-up ring 4 is greater than 5mm, because thickness is too large, the cost of one-way valve can be caused to increase, affect the maximum opening displacement of spool 3 simultaneously, cause product flow to reduce.Such thickness range is set, the working stability of spool 3 can be ensured, play the effect of location, the cost of production of one-way valve can not be increased again, also there is the feature of convenient processing and manufacture.
More specifically in scheme, as shown in Figure 10 and Figure 11, above-mentioned back-up ring 4 can be set to star structure, and above-mentioned directional post is plugged in the center of star structure.The back-up ring 4 of star can either play the effect of restriction spool 3 displacement, and the medium in one-way valve can also be made to circulate smoothly, and has that structure is simple, the advantage of convenient processing and manufacture.Certainly, above-mentioned back-up ring 4 is not limited to star structure, can also be that circle waits other structural types.Riveting reducing can be carried out in the end that valve seat 2 is arranging back-up ring 4, and anti-Sealing shield ring 4 departs from from valve seat 2.
In addition, the present invention also provides a kind of chiller plant, comprises compressor; Also comprise foregoing one-way valve, this one-way valve is connected to the outlet pipe of compressor.
Because above-mentioned one-way valve has above-mentioned technique effect, therefore, the chiller plant comprising this one-way valve also should have corresponding technique effect, does not repeat them here.
Above a kind of chiller plant provided by the present invention and one-way valve thereof are described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.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 carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (8)
1. an one-way valve, comprises valve body (1), valve seat (2) and spool (3), is provided with back-up ring (4) in described valve seat (2); It is characterized in that, also comprise the guide element (5) that the described spool of guiding (3) is moved along the longitudinal center line of described one-way valve; Described guide element (5) is fixedly connected with the one in described back-up ring (4) with described spool (3), is slidably connected with another one;
Described guide element (5) is directional post; One end of described directional post is plugged in described back-up ring (4), and its other end is fixedly connected with described spool (3); And described directional post and described valve seat (2), described spool (3) centering;
Described spool (3) comprises head (32) and afterbody (31), described afterbody (31) is supported in the diapire (21) of described valve seat (2), and and has gap between the roof (22) of described valve seat (2).
2. one-way valve according to claim 1, is characterized in that, described directional post and described spool (3) are injected into one.
3. one-way valve according to claim 1 and 2, it is characterized in that, described directional post is positioned at outside the part between described spool (3) and described back-up ring (4) and is set with spring (6), and when described one-way valve closes, described spring (6) is in compressive state.
4. one-way valve according to claim 3, is characterized in that, the two ends of described spring (6) are connected with described spool (3), described back-up ring (4) respectively.
5. one-way valve according to claim 1 and 2, is characterized in that, the thickness range of described back-up ring (4) is 2mm to 5mm.
6. one-way valve according to claim 5, is characterized in that, the cross section of described back-up ring (4) is star structure, and described directional post is plugged in the center of described star structure.
7. an one-way valve, comprises valve body (1), valve seat (2) and spool (3), is provided with back-up ring (4) in described valve seat (2); It is characterized in that, also comprise the guide element (5) that the described spool of guiding (3) is moved along the longitudinal center line of described one-way valve; Described guide element (5) is fixedly connected with the one in described back-up ring (4) with described spool (3), is slidably connected with another one;
Described guide element (5) is multiple position-limited lever be arranged in parallel, and the two ends of multiple described position-limited lever connect described valve seat (2) and described back-up ring (4) respectively; In the radial direction of described one-way valve, described spool (3) is connected in the inside of multiple described position-limited lever;
And the periphery wall of described spool (3) all contacts with each described position-limited lever.
8. a chiller plant, comprises compressor; It is characterized in that, also comprise the one-way valve as described in any one of claim 1-7, described one-way valve is connected to the outlet pipe of described compressor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110110799.6A CN102758941B (en) | 2011-04-29 | 2011-04-29 | A kind of chiller plant and one-way valve thereof |
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| CN201110110799.6A CN102758941B (en) | 2011-04-29 | 2011-04-29 | A kind of chiller plant and one-way valve thereof |
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| CN102758941B true CN102758941B (en) | 2016-03-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104265919B (en) * | 2014-10-09 | 2017-01-11 | 平原机器厂（新乡） | Valve spool and rapid escape valve applying same and pneumatic piston actuating mechanism |
| CN104405937A (en) * | 2014-11-18 | 2015-03-11 | 安徽江淮汽车股份有限公司 | Check valve structure for fuel oil pump |
| CN107314135B (en) * | 2016-04-26 | 2020-07-07 | 浙江三花制冷集团有限公司 | One-way valve |
| KR102556562B1 (en) * | 2021-05-31 | 2023-07-19 | 주식회사 화승알앤에이 | Check valve, system for refrigerants pipe having the same and method of assembling the same |
| CN113757426B (en) * | 2021-10-09 | 2024-08-27 | 浙江亿田智能厨电股份有限公司 | Hose gas shutoff structure of gas stove |
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| CN2389276Y (en) * | 1999-08-22 | 2000-07-26 | 周好弟 | Multi-position type check valve |
| CN101865552A (en) * | 2010-06-22 | 2010-10-20 | 合肥天鹅制冷科技有限公司 | Air conditioning equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102758941A (en) | 2012-10-31 |
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