Inflation and deflation combination valve with filtering function

Abstract

The invention relates to the field of gas inflation and deflation, in particular to an inflation and deflation combination valve with a filtering function, and aims at solving the technical problem that the overall occupied space of an existing inflation and deflation system is increased due to the fact that a filtering device is additionally arranged. The inflation and deflation combination valve with the filtering function comprises a sealing shell with a sealing inner cavity and a multi-way valve arranged in the sealing inner cavity. And a first flow channel communicated with the sealed inner cavity of the sealed shell is arranged on the sealed shell. The multi-way valve comprises a second flow channel, a filtering flow channel provided with a fluid filtering structure and a straight-through flow channel allowing fluid to naturally pass through. The second flow channel communicates with the outside of the sealing shell. The filtering flow channel and the straight-through flow channel are kept in the sealed shell and are communicated with the sealed inner cavity. And the first flow channel is communicated with the filtering flow channel and the straight-through flow channel through the sealing inner cavity. According to the multi-way valve, the straight-through flow channel and the filtering flow channel are integrated on the same valve body through the multi-way valve, an input / output pipeline of the multi-way valve is replaced by the sealing shell, and the occupied space of the inflation and deflation system is effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the field of gas charging and discharging, and particularly relates to a combined charging and discharging valve with a filtering function. Background Art

[0002] GIS is the abbreviation of Gas Insulated metal-enclosed Switchgear, that is, gas-insulated metal-enclosed switchgear. It uses SF6 gas as the insulating and arc-extinguishing medium, and encapsulates the circuit breaker (GCB), disconnector (DS), earthing switch (ES), fast earthing switch (HES), instrument transformers (CT and VT), lightning arrester and connecting busbars in a grounded metal shell, and separates them into individual gas chambers with insulating basins, and fills them with SF6 gas at 0.3 - 0.65 Mpa.

[0003] During the factory acceptance test or grid operation of GIS, some common faults may occur, such as internal discharge faults, operating mechanism faults, gas leakage faults, etc. Among them, the internal discharge fault of GIS poses the greatest threat to the safe operation of the equipment. The presence of foreign objects inside GIS is an important factor inducing the discharge fault of GIS. However, foreign objects such as metal particles and dust are small in volume and difficult to observe with the naked eye, and are not easily detected after entering GIS. They are the control difficulties in the production and on-site installation of GIS, and also the biggest hidden danger to the safe operation of GIS. Once such foreign objects are mixed into GIS, the foreign objects will migrate in position under the continuous action of the electric field force. When the electric field strength is greater than a specific value, the foreign objects are very likely to jump between the grounded shell and the high-voltage conductor under the continuous action of the electric field force, thereby changing the local electric field strength and causing internal discharge.

[0004] The process of charging and discharging gas into GIS is extremely likely to cause foreign objects such as metal particles and dust to enter GIS. Therefore, GIS manufacturers usually add a filtering device between the gas filling joint and the GIS equipment to avoid the above situation. During the production process of GIS equipment, due to the differences between the various links of insulating gas treatment, operators need to repeatedly perform the operations of disassembling and installing the filtering device according to the specific link requirements. For example, after the factory acceptance test is completed, the filter needs to be removed during the process of completely recovering the insulating gas so that the foreign objects already existing inside the GIS product can flow out along with the gas flow. After the SF6 gas in the GIS product is completely recovered, air needs to enter the GIS to balance the internal negative pressure of the GIS product. At this time, a filter needs to be installed again to filter the impurities in the air. Based on the above considerations, the filtering device is usually independent of the gas charging and discharging equipment and is detachably arranged. However, this will lead to an increase in the occupied space of the entire gas charging and discharging system and inconvenience in use; at the same time, it is easy to cause the situation of missing the addition of the filter, which has a serious impact on the quality and safety of the product. Summary of the Invention

[0005] The object of the present invention is to provide a combined inflation and deflation valve with a filtering function to solve the technical problem of large overall occupied space of the inflation and deflation system in the prior art.

[0006] The present invention adopts the following technical solutions:

[0007] A combined inflation and deflation valve with a filtering function includes a sealed housing having a sealed inner cavity and a multi-way valve disposed in the sealed inner cavity; a first flow channel communicating with the sealed inner cavity is provided on the sealed housing, and the multi-way valve includes a second flow channel, a filtering flow channel provided with a fluid filtering structure, and a direct flow channel for fluid to pass through naturally; the second flow channel communicates with the outside of the sealed housing, the filtering flow channel and the direct flow channel are kept in the sealed housing and communicate with the sealed inner cavity, and the first flow channel communicates with the filtering flow channel and the direct flow channel through the sealed inner cavity.

[0008] Beneficial effects: The present invention proposes a brand-new combined inflation and deflation valve with a filtering function. The combined inflation and deflation valve with a filtering function includes a sealed housing and a multi-way valve. The multi-way valve includes a second flow channel communicating with the outside of the sealed housing, a filtering flow channel provided with a fluid filtering structure, and a direct flow channel for fluid to pass through naturally, so that it is convenient to switch the path of fluid flow through the multi-way valve according to actual needs. When the fluid flows into the multi-way valve from the second flow channel, through the switching action of the multi-way valve, it can be directly output from the multi-way valve through the direct flow channel, or output from the multi-way valve after being filtered by the filtering flow channel. The same is true when the fluid flows into the multi-way valve from the direct flow channel or the filtering flow channel and is output from the multi-way valve through the second flow channel. The multi-way valve is disposed in the sealed inner cavity of the sealed housing, and a first flow channel communicating with the sealed inner cavity is provided on the sealed housing, and the second flow channel communicates with the outside of the sealed housing. This is convenient for directly connecting the first flow channel and the second flow channel to other structures on the inflation and deflation system. Since the filtering flow channel and the direct flow channel are kept in the sealed housing and communicate with the sealed inner cavity, and the first flow channel communicates with the filtering flow channel and the direct flow channel through the sealed inner cavity; therefore, the fluid input from the first flow channel will preferentially fill the sealed inner cavity of the sealed housing, and then output from the second flow channel through the filtering flow channel / direct flow channel; or the fluid input from the second flow channel will preferentially fill the sealed housing after passing through the filtering flow channel / direct flow channel, and then output from the first flow channel. The inflation and deflation system adopting the above structure first integrates the direct flow channel and the filtering flow channel in the same valve through the setting of the multi-way valve, so as to switch the fluid flow path according to specific needs, effectively reducing the occupied space of the inflation and deflation system itself. Secondly, the inflation and deflation system adopting the above structure uses the sealed housing to replace the input / output pipelines of the multi-way valve, avoiding complex pipeline structures, simplifying the structure and reducing the leakage points on the inflation and deflation system at the same time; the gas supply device of the inflation and deflation system can be directly connected to the acquisition device or the working device of the inflation and deflation system through the combined inflation and deflation valve with a filtering function, effectively reducing the occupied space of the inflation and deflation system itself.

[0009] Further: The multi-way valve is a three-way plug valve including a valve core and a valve body; a T-shaped passage for fluid to flow through is provided on the valve core; the straight-through flow channel and the second flow channel are axially opposed to each other, and the filtering flow channel and the second flow channel are axially perpendicular to each other.

[0010] Beneficial effects: Compared with other forms of multi-way valves, the three-way plug valve mainly realizes the switching of fluid passages by the rotation of the valve core in the valve body, without occupying the space outside the valve body. On this basis, the straight-through flow channel and the second flow channel are axially opposed to each other, and the filtering flow channel and the second flow channel are axially perpendicular to each other. Such an arrangement can better adapt to the valve core with a T-shaped passage for fluid to flow through on the three-way plug valve. The straight-through flow channel and the second flow channel are linearly connected through the passage corresponding to the horizontal part at the upper end of the "T" in the T-shaped passage. In this way, the fluid can be subjected to a lower flow resistance when flowing through this passage, and thus it is convenient for the fluid flowing through this passage to maintain a higher flow rate. The filtering flow channel and the second flow channel are perpendicularly connected through the upper horizontal part corresponding to a part of the "T" and all the vertical part passages in the T-shaped passage. In this way, the fluid can be subjected to a right-angle flow resistance when flowing through this passage, prolonging the time for the fluid to pass through the filtering flow channel and ensuring that the fluid can be fully filtered by the filtering flow channel. In addition, the passage in the valve core specifically adopts a T-shaped structure, which is also convenient for positioning and processing.

[0011] Further: The filtering flow channel is an L-shaped flow channel; the L-shaped flow channel includes a longitudinal section and a transverse section, wherein the longitudinal section is axially perpendicular to the second flow channel, and the transverse section extends coaxially with the straight-through flow channel.

[0012] Beneficial effects: The filtering flow channel is an L-shaped flow channel, which can increase the flow resistance of the filtering flow channel to the fluid, thereby reducing the flow rate of the fluid flowing through the filtering flow channel, prolonging the time for the fluid to pass through the filtering flow channel, and ensuring that the fluid can be fully filtered by the filtering flow channel. On this basis, compared with a straight-through flow channel, the L-shaped flow channel occupies less space in a single direction on the premise of ensuring the same filtering path. Therefore, making the longitudinal section of the L-shaped flow channel axially perpendicular to the second flow channel and the transverse section of the L-shaped flow channel extend coaxially with the straight-through flow channel can effectively reduce the size of the charging and discharging combination valve with a filtering function in the direction axially perpendicular to the second flow channel, making the spatial distribution of the charging and discharging combination valve with a filtering function more uniform and reasonable; furthermore, it can avoid the problem of space waste caused by the too large size of the charging and discharging system to adapt to the charging and discharging combination valve with a filtering function, and effectively save the occupied space of the charging and discharging system itself.

[0013] Further: At least part of the first flow channel extends towards the inside of the sealing housing.

[0014] Beneficial effects: At least a part of the first flow channel extends towards the inside of the sealed housing, occupying part of the space inside the sealed housing. Therefore, on the premise of ensuring its own effect, the overall volume of the inflation and deflation combined valve with a filtering function is effectively saved, and further, the occupied space of the inflation and deflation system using the inflation and deflation combined valve with a filtering function is reduced.

[0015] Furthermore: The filtering flow channel is arranged in parallel with the part of the first flow channel extending towards the inside of the sealed housing and coincides axially.

[0016] Beneficial effects: The filtering flow channel is arranged in parallel with the part of the first flow channel extending towards the inside of the sealed housing and coincides axially. Such a setting can achieve the purpose of reducing the overall volume of the inflation and deflation combined valve with a filtering function by sharing part of the axial space inside the sealed housing between the filtering flow channel and the first flow channel, and further reduces the occupied space of the inflation and deflation system using the inflation and deflation combined valve with a filtering function.

[0017] Furthermore: The multi-way valve is a plug valve; the plug valve includes a manual operation end; the manual operation end extends outside the sealed housing to control the switching of the internal passage of the valve.

[0018] Beneficial effects: The plug valve includes a manual operation end. By manually operating the plug valve through the manual operation end, the intervention of the driving mechanism can be avoided. Furthermore, there is no need to design additional space around the plug valve to install the driving mechanism, effectively saving the occupied space of the inflation and deflation combined valve with a filtering function.

[0019] Furthermore: A rotary handwheel is fixedly arranged on the part of the manual operation end extending outside the sealed housing, and the handwheel is closely attached to the sealed housing.

[0020] Beneficial effects: A rotary handwheel is fixedly arranged on the part of the manual operation end extending outside the sealed housing, which can make the plug valve easier to control. At the same time, the rotary handwheel occupies a small space, which can save the occupied space of the inflation and deflation combined valve with a filtering function. The handwheel is closely attached to the sealed housing, which further saves the occupied space of the inflation and deflation combined valve with a filtering function. Therefore, by adopting the above structure, the occupied space of the inflation and deflation combined valve with a filtering function can be saved as much as possible through the setting of the manual operation end and the rotary handwheel on the manual operation end, and further achieve the purpose of reducing the occupied space of the inflation and deflation system itself.

[0021] Furthermore: A stroke limiting mechanism is also arranged between the rotary handwheel and the sealed housing.

[0022] Beneficial effects: By arranging a stroke limiting mechanism between the rotary handwheel and the sealing housing, it is possible to prevent the over - stroke of the rotary handwheel, which may cause the internal passage of the plug valve to be blocked, and eliminate the trouble of finding the stroke of the rotary handwheel during use. The stroke limiting mechanism is arranged between the rotary handwheel and the sealing housing, which can avoid the stroke limiting mechanism occupying extra space, effectively reducing the occupied space of the charging and discharging gas combination valve with a filtering function, and further achieving the purpose of reducing the occupied space of the charging and discharging gas system itself.

[0023] Furthermore: The stroke limiting mechanism is a guide rod and guide groove stroke limiting structure.

[0024] Beneficial effects: The guide rod and guide groove structure is easy to form and convenient for miniaturization design, and is more suitable for the charging and discharging gas combination valve with a filtering function having a compact space layout. At the same time, the guide rod and guide groove occupy relatively less space, which is beneficial to saving the occupied space of the charging and discharging gas combination valve with a filtering function.

[0025] Furthermore: The sealing housing is a split structure; the split parts are hermetically connected to enclose a sealed inner cavity.

[0026] Beneficial effects: The sealing housing is a split structure; the split parts are hermetically connected to enclose a sealed inner cavity. Such a setting can facilitate the replacement of the filter element on the filter flow path. At the same time, compared with integral molding, the sealing housing is composed of multiple split parts that are hermetically connected to each other, which is convenient for molding and conducive to structural compactness. Description of the Drawings

[0027] Figure 1 is an external perspective view of an embodiment of the charging and discharging gas combination valve with a filtering function according to the present invention;

[0028] Figure 2 is Figure 1 an external schematic view of the three - way plug valve in

[0029] Figure 3 is Figure 2 an external schematic view of the valve core of the three - way plug valve in

[0030] Figure 4 is Figure 1 an external schematic view when the rotary handwheel is not installed;

[0031] The names of the components corresponding to the corresponding reference numerals in the figure are: 1. multi - way valve; 2. sealing housing; 3. first flow path; 4. second flow path; 5. straight - through flow path; 6. filter flow path; 7. valve core; 8. valve body; 9. T - shaped passage; 10. manual operation end; 11. rotary handwheel; 12. handwheel clamping projection; 13. compression nut; 14. groove; 15. guide rod; 16. guide groove. Detailed Embodiment

[0032] The features and performance of the present invention will be further described in detail below in conjunction with the embodiments.

[0033] The principle of the solution of the combined charging and discharging valve with a filtering function in the present invention is as follows:

[0034] As Figure 1 shown, a combined charging and discharging valve with a filtering function includes a sealed housing 2 having a sealed inner cavity and a multi-way valve 1 disposed in the sealed inner cavity. As Figure 2 shown, the multi-way valve 1 includes a second flow channel 4 for communicating with the outside of the sealed housing 2, a filtering flow channel 6 provided with a fluid filtering structure, and a direct flow channel 5 for the fluid to pass through naturally. This facilitates switching the path of the fluid flowing through the multi-way valve 1 according to actual needs. When the fluid flows into the multi-way valve 1 from the second flow channel 4, through the switching action of the multi-way valve 1, it can be directly output from the multi-way valve 1 through the direct flow channel 5, or output from the multi-way valve 1 after being filtered through the filtering flow channel 6. The same is true when the fluid flows into the multi-way valve 1 from the direct flow channel 5 or the filtering flow channel 6 and is output from the multi-way valve 1 through the second flow channel 4. The multi-way valve 1 is disposed in the sealed inner cavity of the sealed housing 2, and a first flow channel 3 communicating with its sealed inner cavity is provided on the sealed housing 2, and the second flow channel 4 communicates with the outside of the sealed housing 2. In this way, the first flow channel 3 and the second flow channel 4 can be directly connected to other structures on the charging and discharging system. Since the filtering flow channel 6 and the direct flow channel 5 are kept in the sealed housing and communicate with the sealed inner cavity, the first flow channel 3 communicates with the filtering flow channel 6 and the direct flow channel 5 through the sealed inner cavity; therefore, the fluid input from the first flow channel 3 will preferentially fill the sealed housing 2 and then be output from the second flow channel 4 through the filtering flow channel 6 / direct flow channel 5; or the fluid input from the second flow channel 4 will preferentially fill the sealed housing 2 after passing through the filtering flow channel 6 / direct flow channel 5 and then be output from the first flow channel 3.

[0035] The charging and discharging system adopting the above structure first integrates the direct flow channel 5 and the filtering flow channel 6 in the same valve through the setting of the multi-way valve 1, so as to switch the line of the fluid flowing through according to specific needs, effectively reducing the occupied space of the charging and discharging system itself. Secondly, the charging and discharging system adopting the above structure uses the sealed housing 2 to replace the input / output pipelines of the multi-way valve 1, avoiding complex pipeline structures, simplifying the structure and reducing the leakage points on the charging and discharging system at the same time; the gas supply device of the charging and discharging system can be directly connected to the acquisition device or the working device of the charging and discharging system through the above structure, effectively reducing the occupied space of the charging and discharging system itself.

[0036] Based on the above solution principle, Embodiment 1 of the combined charging and discharging valve with a filtering function according to the present invention is:

[0037] A combined charging and discharging valve with a filtering function, the structure of which can be referred to Figure 1As shown, it includes a sealed housing 2 and a multi-way valve 1 disposed within the sealed housing 2. The structure of the multi-way valve 1 can be referred to Figure 2 As shown, it includes a second flow path 4 for communicating with the outside of the sealed housing 2, a filter flow path 6 provided with a fluid filtration structure, and a straight-through flow path 5 for fluid to pass through naturally, so as to switch the path of the fluid flowing through by the multi-way valve 1 according to actual needs. A first flow path 3 for fluid to flow in / out is provided on the sealed housing 2, and the second flow path 4 extends outside the sealed housing 2, so as to directly connect with other structures on the charging / discharging gas system by using the first flow path 3 and the second flow path 4. The multi-way valve 1 is disposed in the sealed inner cavity of the sealed housing 2. A first flow path 3 communicating with its sealed inner cavity is provided on the sealed housing 2, and the second flow path 4 communicates with the outside of the sealed housing 2. Therefore, the fluid input from the first flow path 3 will preferentially fill in the sealed housing 2, and then output from the second flow path 4 through the filter flow path 6 / straight-through flow path 5; or the fluid input from the second flow path 4 will preferentially fill in the sealed housing 2 after passing through the filter flow path 6 / straight-through flow path 5, and then output from the first flow path 3. The above setting integrates the straight-through flow path 5 and the filter flow path 6 on the same valve through the multi-way valve 1, and uses the sealed housing 2 to replace the input / output pipelines of the multi-way valve 1, avoiding complex pipeline structures, and thus effectively reducing the occupied space of the charging / discharging gas system itself.

[0038] The key point of this embodiment is that the multi-way valve 1 is a plug valve including a valve body 8 and a valve core 7. Compared with other forms of multi-way valves 1, the plug valve mainly realizes the switching of the fluid passage by the rotation of the valve core 7 within the valve body 8, without occupying the space outside the valve body 8. Therefore, the multi-way valve 1 being a plug valve including a valve body 8 and a valve core 7 can effectively reduce the volume of the charging / discharging gas combination valve with a filtering function, and further reduce the occupied space of the charging / discharging gas system using the charging / discharging gas combination valve with a filtering function. Of course, other structures of multi-way valves 1 can also be used here, such as a plunger valve. In the case where space permits and the fluid pressure within the charging / discharging gas system is too high, the plunger valve is more applicable than the plug valve.

[0039] In order to further reduce the occupied space of the plug valve, the passages on the plug valve can be reduced. In this embodiment, the plug valve is a three-way plug valve. The valve core 7 of the three-way plug valve is as Figure 3As shown in the figure, a T-shaped passage 9 for fluid flow is provided thereon. The straight-through flow channel 5 and the second flow channel 4 are axially aligned, and the filtering flow channel 6 is axially perpendicular to the second flow channel 4. Such an arrangement can better adapt to the valve core 7 of the plug valve having a T-shaped passage 9 for fluid flow. The straight-through flow channel 5 and the second flow channel 4 are linearly connected through the passage corresponding to the upper horizontal part of the "T" in the T-shaped passage 9. In this way, the fluid can be subjected to a lower flow resistance when flowing through this passage, and thus it is convenient for the fluid flowing through this passage to maintain a higher flow rate. The filtering flow channel 6 and the second flow channel 4 are perpendicularly connected through the upper horizontal part corresponding to a part of the "T" and all the vertical part passages in the T-shaped passage 9. In this way, the fluid can be subjected to a right-angle flow resistance when flowing through this passage, extending the time for the fluid to pass through the filtering flow channel 6 and ensuring that the fluid can be fully filtered by the filtering flow channel 6. In addition, the passage in the valve core 7 is specifically in a T-shaped structure, which is also convenient for positioning and processing.

[0040] Of course, the plug valve can also be a four-way valve, a five-way valve, and other plug valves with more than three passages. When the plug valve is a five-way plug valve, one passage can be used as the second flow channel 4, the other two passages can be used as the straight-through flow channels 5, and the remaining passage can be used as the filtering flow channel 6. The specific number of the second flow channel 4, the straight-through flow channels 5, and the filtering flow channel 6 can be specifically set according to actual needs. On this basis, the specific shape of the passage on the valve core 7 can be adjusted adaptively. When the plug valve is a five-way plug valve, the passages on the valve core 7 can be specifically set as five passages arranged circumferentially at equal angles according to the usage situation. The relative arrangement positions of the straight-through flow channel 5 and the second flow channel 4, and the relative arrangement positions of the filtering flow channel 6 and the second flow channel 4 will also change adaptively, which will not be elaborated here one by one.

[0041] On the basis of the foregoing structure, the filtering flow channel 6 can be set as an L-shaped flow channel. The L-shaped flow channel specifically includes a longitudinal section and a transverse section, wherein the longitudinal section is axially perpendicular to the second flow channel 4, and the transverse section extends coaxially with the straight-through flow channel 5. This can increase the flow resistance of the filtering flow channel 6 to the fluid, thereby reducing the flow rate of the fluid flowing through the filtering flow channel 6, extending the time for the fluid to pass through the filtering flow channel 6, and ensuring that the fluid can be fully filtered by the filtering flow channel 6. On this basis, compared with a straight flow channel, the L-shaped flow channel occupies less space in a single direction on the premise of ensuring the same filtering path. Therefore, making the longitudinal section of the L-shaped flow channel axially perpendicular to the second flow channel 4 and the transverse section of the L-shaped flow channel extend coaxially with the straight-through flow channel 5 can effectively reduce the size of the charging and discharging combined valve with a filtering function in the direction axially perpendicular to the second flow channel 4, making the spatial distribution of the charging and discharging combined valve with a filtering function more uniform and reasonable; furthermore, it can avoid the problem of space waste caused by the too large size of the charging and discharging system to adapt to the charging and discharging combined valve with a filtering function, and effectively save the occupied space of the charging and discharging system itself.

[0042] Of course, to avoid the oversize of the combined charging / discharging valve with a filtering function in a single direction, the filtering flow channel 6 can also be set in an S shape. The S-shaped filtering flow channel 6 is equivalent to the combination of multiple pairs of L-shaped flow channels. Therefore, it can also avoid the oversize of the combined charging / discharging valve with a filtering function in a single direction. However, the S-shaped flow channel is difficult to process and has a great flow resistance to the fluid. It is only applicable to the combined charging / discharging valve with a filtering function where the fluid pressure is small and the filtering effect requirement is strict.

[0043] Furthermore, part or the whole of the first flow channel 3 can be extended towards the inside of the sealing housing 2. In this way, part of the space inside the sealing housing 2 can be borrowed to set the first flow channel 3. Therefore, on the premise of ensuring the flow effect of the first flow channel 3, the overall volume of the combined charging / discharging valve with a filtering function is effectively saved, and further the self-occupied space of the charging / discharging system adopting the combined charging / discharging valve with a filtering function is reduced. Of course, when the space inside the sealing housing 2 is insufficient, the first flow channel 3 can also be set by compressing the volume of the first flow channel 3 so that the whole of the first flow channel 3 is located outside the sealing housing 2.

[0044] Since part or the whole of the first flow channel 3 extending towards the inside of the sealing housing 2 can effectively save the volume of the combined charging / discharging valve with a filtering function. On this basis, preferably, the filtering flow channel 6 and the part of the first flow channel 3 extending towards the inside of the sealing housing 2 can be arranged side by side and axially coincident. This is convenient for the filtering flow channel 6 and the part of the first flow channel 3 extending towards the inside of the sealing housing 2 to share part of the axial space inside the sealing housing 2 to achieve the purpose of further reducing the overall volume of the combined charging / discharging valve with a filtering function, and further reducing the self-occupied space of the charging / discharging system adopting the combined charging / discharging valve with a filtering function.

[0045] In addition, the sealing housing 2 is preferably of a split structure, and the split parts are hermetically connected to enclose a sealed inner cavity. This can facilitate the replacement of the filter element in the filtering flow channel 6. At the same time, compared with integral molding, the sealing housing 2 is composed of multiple split parts that are hermetically connected to each other, which is convenient for molding and conducive to structural compactness. Of course, the sealing housing 2 can also be formed by welding the split parts into one body. This is beneficial to improving the overall rigidity of the sealing housing 2 and is more suitable for the use scenario under high fluid pressure.

[0046] To better illustrate this embodiment, a practical case of a combined charging / discharging valve with a filtering function actually applied in the factory test of GIS is specifically given as follows:

[0047] After the factory test of the GIS, all the insulating gas in it needs to be recovered. Now, the first flow channel 3 of the combined gas charging and discharging valve with a filtering function is hermetically connected to the gas port of the GIS, and the second flow channel 4 is hermetically connected to the gas port of the recovery device. During the recovery process, first, control the upper valve core 7 of the three-way cock valve to rotate to the position where the second flow channel 4 is connected to the straight-through flow channel 5. At this time, the insulating gas inside the GIS passes through the first flow channel 3, first fills into the sealed housing 2, and then is recovered into the recovery device through the straight-through flow channel 5 and the second flow channel 4. Since the second flow channel 4 and the straight-through flow channel 5 are arranged opposite to each other, the flow resistance in the passage is small. The insulating gas can flow out at a relatively high speed, and then flush out the foreign objects existing inside the GIS. After all the insulating gas is recovered, the GIS needs air to enter its interior to balance the negative pressure inside it. Therefore, at this time, it is necessary to control the upper valve core 7 of the three-way cock valve to rotate reversely to the position where the second flow channel 4 is connected to the filtering flow channel 6. Under the action of the negative pressure inside the GIS, air enters the filtering flow channel 6 through the second flow channel 4, and after being filtered by the filtering flow channel 6 to remove the impurities therein, it fills into the GIS.

[0048] Based on the above scheme principle and Embodiment 1, Embodiment 2 of the combined gas charging and discharging valve with a filtering function according to the present invention is as follows:

[0049] Compared with Embodiment 1, the key point of this embodiment is that the multi-way valve 1 is a cock valve including a valve body 8 and a valve core 7, and the cock valve further includes a manual operation end 10. By manually operating the cock valve through the manual operation end 10, the intervention of the driving mechanism can be avoided. Furthermore, there is no need to design additional space around the cock valve to install the driving mechanism, effectively saving the occupied space of the combined gas charging and discharging valve with a filtering function. Of course, the cock valve can also be an electromagnetic cock valve to avoid the setting of the manual operation end 10. This better meets the requirements of modern factories for unmanned and intelligent operation.

[0050] To achieve the above effect, the manual operation end 10 extends outside the sealed housing 2 to control the switching of the internal passage of the valve, and thus the cock valve is easier to control. A rotating handwheel 11 is fixedly arranged on the part of the manual operation end 10 extending outside the sealed housing 2, and the rotating handwheel 11 is closely attached to the sealed housing 2. The rotating handwheel 11 occupies a small space, which can save the occupied space of the combined gas charging and discharging valve with a filtering function. The handwheel is closely attached to the sealed housing 2, which further saves the occupied space of the combined gas charging and discharging valve with a filtering function. Therefore, by adopting the above structure, the occupied space of the combined gas charging and discharging valve with a filtering function can be saved as much as possible through the setting of the manual operation end 10 and the rotating handwheel 11 on the manual operation end 10, and thus the purpose of reducing the occupied space of the gas charging and discharging system itself is achieved.

[0051] In this embodiment, the manual operation end 10 can specifically be an operating rod. One end of the operating rod, such as Figure 4The shown setting is provided with a limit projection for interference fit with a groove 14 provided on the plug valve spool 7, so that the plug valve spool 7 can rotate synchronously with the operating rod. The operating rod passes through the valve body 8 and the sealing housing 2, and sealing treatments are made at the mating clearances between it and the valve body 8 and the sealing housing 2. One end of the operating rod exposed outside the sealing housing 2 is processed with a threaded section, and a handwheel clamping projection 12 is provided on the axial side of the threaded section. A card slot corresponding to the handwheel clamping projection 12 is provided on the rotating handwheel 11. The rotating handwheel 11 is clamped on the operating rod, and drives the operating rod to rotate under the action of manual work through the transmission between the card slot and the handwheel clamping projection 12. A compression nut 13 is screwed on the threaded section to compress the rotating handwheel 11.

[0052] A limit mechanism is preferably provided between the rotating handwheel 11 and the sealing housing 2. By providing a limit mechanism between the rotating handwheel 11 and the sealing housing 2, it is possible to prevent the rotating handwheel 11 from rotating beyond the limit, resulting in the obstruction of the internal passage of the plug valve, and saving the trouble of finding the stroke of the rotating handwheel 11 during use. The limit mechanism is provided between the rotating handwheel 11 and the sealing housing 2, which can avoid the limit mechanism occupying extra space, effectively reduce the occupied space of the charging and discharging gas combination valve with a filtering function, and further achieve the purpose of reducing the occupied space of the charging and discharging gas system itself. Of course, the limit mechanism can also be provided between the spool 7 and the valve body 8. For example, a limit groove is provided on the spool 7, and a matching limit block is provided on the valve housing. Such a structure is applicable to a charging and discharging gas combination valve with a filtering function with high requirements for limit accuracy, and can avoid the limit accuracy error caused by assembly tolerance.

[0053] The limit mechanism preferably adopts a guide rod and guide groove limit structure. The guide rod 15 and guide groove 16 structure is easy to form and convenient for miniaturized design, and is more suitable for a charging and discharging gas combination valve with a filtering function with a compact space layout. At the same time, the guide rod 15 and guide groove 16 occupy relatively small space, which is beneficial to saving the occupied space of the charging and discharging gas combination valve with a filtering function. The guide rod 15 can be specifically fixedly provided on the sealing housing 2, and the guide groove 16 is provided on the rotating handwheel 11; or the guide rod 15 is provided on the rotating handwheel 11, and the guide groove 16 is provided on the sealing housing 2. In addition, a pair of stop blocks can also be provided on the sealing housing 2, and a stroke block corresponding to the stroke between the pair of stop blocks is provided on the rotating handwheel 11, and the purpose of limiting the stroke of the rotating handwheel 11 is achieved through the stopping action of the pair of stop blocks on the stroke block on the rotating handwheel 11.

[0054] In this embodiment, the parts not emphasized are the same as those in Embodiment 1.

[0055] The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention by the same token.

Claims

1. A combined charging and discharging valve with a filtering function, characterized in that, it includes a sealed housing with a sealed inner cavity and a multi-way valve arranged in the sealed inner cavity; a first flow channel communicating with the sealed inner cavity is provided on the sealed housing, and the multi-way valve includes a second flow channel, a filtering flow channel provided with a fluid filtering structure, and a straight-through flow channel for fluid to pass through naturally; the second flow channel communicates with the outside of the sealed housing, the filtering flow channel and the straight-through flow channel are kept in the sealed housing and communicate with the sealed inner cavity, and the first flow channel communicates with the filtering flow channel and the straight-through flow channel through the sealed inner cavity.

2. The combined charging and discharging valve with a filtering function according to claim 1, characterized in that, the multi-way valve is a three-way plug valve including a valve core and a valve body; a T-shaped passage for fluid to flow through is provided on the valve core; the straight-through flow channel and the second flow channel are axially arranged opposite to each other, and the filtering flow channel and the second flow channel are axially perpendicular to each other.

3. The combined charging and discharging valve with a filtering function according to claim 2, characterized in that, the filtering flow channel is an L-shaped flow channel; the L-shaped flow channel includes a longitudinal section and a transverse section, wherein the longitudinal section is axially perpendicular to the second flow channel, and the transverse section extends coaxially with the straight-through flow channel.

4. The combined charging and discharging valve with a filtering function according to claim 1, characterized in that, at least part of the first flow channel extends towards the inside of the sealed housing.

5. The combined charging and discharging valve with a filtering function according to claim 4, characterized in that, the filtering flow channel and the part of the first flow channel extending towards the inside of the sealed housing are arranged side by side and coincide axially.

6. The combined charging and discharging valve with a filtering function according to claim 1, characterized in that, the multi-way valve is a plug valve; the plug valve includes a manual operation end; the manual operation end extends outside the sealed housing so as to control the switching of the internal passage of the valve.

7. The combined charging and discharging valve with a filtering function according to claim 6, characterized in that, a rotating handwheel is fixedly arranged on the part of the manual operation end extending outside the sealed housing, and the handwheel is closely attached to the sealed housing.

8. The combined charging and discharging valve with a filtering function according to claim 7, characterized in that, a stroke limiting mechanism is further arranged between the rotating handwheel and the sealed housing.

9. The combined charging and discharging valve with a filtering function according to claim 8, characterized in that, the stroke limiting mechanism is a guide rod and guide groove stroke limiting structure.

10. The combined charging and discharging valve with a filtering function according to claim 1, characterized in that, the sealed housing is a split structure; the split parts are hermetically connected to enclose the sealed inner cavity.

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