Double-inlet and double-outlet electromagnetic valve and gas detection system

Abstract

The invention discloses a double-inlet and double-outlet electromagnetic valve and a gas detection system, and relates to the technical field of valve and fluid detection. The electromagnetic valve adopts a double-inlet and double-outlet double-channel design, so that two inlets of the double-channel are respectively and simultaneously connected with two air pipes of the pitot tube, and the problems that the existing common single-channel inlet and outlet electromagnetic valve is connected with the pitot tube, the number of the electromagnetic valves is large, the installation period is long, the working efficiency is low, the equipment size is large, the weight is heavy, and the cost is low can be solved. And the transportation and carrying difficulty is high. After the electromagnetic pilot head is powered off, the positive pressure air chamber applies positive pressure air flow to the valve element to close the valve, the problem that the valve element is not smoothly closed due to impurity residues in the valve cavity can be avoided, the valve can be rapidly closed through the positive pressure air flow, and it is guaranteed that the electromagnetic valve is in a normally-closed state. The positive pressure air chamber is matched with the electromagnetic pilot head, and it can be guaranteed that the electromagnetic valve can be reliably opened and closed under different working conditions. The gas detection system adopts the double-inlet and double-outlet electromagnetic valve to supply gas, and the flow supply requirement can be met.

Description

Technical Field

[0001] The present invention relates to the technical fields of valves and fluid detection, and in particular to a double-inlet and double-outlet solenoid valve and a gas detection system. Background Art

[0002] When conducting coal mine fluid detection, single-inlet and single-outlet solenoid valves are used. When using a pitot tube for flow velocity detection, it is necessary to detect the two-way airflows on the pitot tube simultaneously. This requires installing single-inlet solenoid valves on the two air pipes of the pitot tube respectively. Since the number of single-inlet solenoid valves is large, not only the installation period is long and the work efficiency is low, but also the equipment is large in volume and weight, and difficult to transport and handle, which causes inconvenience to the development of coal mine fluid detection operations. Summary of the Invention

[0003] The object of the present invention is to provide a double-inlet and double-outlet solenoid valve and a gas detection system including the double-inlet and double-outlet solenoid valve. The solenoid valve adopts a double-path design of double-inlet and double-outlet, and the inlets of the double paths can be respectively connected to the two air pipes of the pitot tube to solve the problems that when using ordinary single-inlet and single-outlet solenoid valves, the number of solenoid valves is large, not only the installation period is long and the work efficiency is low, but also the equipment is large in volume and weight, and difficult to transport and handle.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] On the one hand, the present invention provides a double-inlet and double-outlet solenoid valve, including:

[0006] A valve body, in which a valve cavity, a passage one and a passage two are provided, and the passage one and the passage two both cross-connect with the valve cavity;

[0007] A valve core, movably inserted into the valve cavity, and a sealing portion one and a sealing portion two corresponding to the passage one and the passage two respectively are provided on the valve core;

[0008] An electromagnetic pilot head, provided at one end of the valve body. When the electromagnetic pilot head is energized, it can drive the valve core to move so that the passage one and the passage two are opened simultaneously to form a double path;

[0009] A positive pressure air chamber, provided at the same end of the valve body as the electromagnetic pilot head. The positive pressure air chamber can apply a positive pressure airflow to the end of the valve core after the electromagnetic pilot head is powered off to drive the valve core to move in the reverse direction and close the double path.

[0010] In some embodiments, the valve cavity penetrates through the axial two ends of the valve body; valve body end covers one and two are respectively provided at the axial two ends of the valve body, and a concave cavity for the valve core to extend into is provided at one end of the valve body end cover one facing the valve body;

[0011] The electromagnetic pilot head and the positive pressure air chamber are both arranged on the valve body end cover 1, and the air outlet end of the positive pressure air chamber is communicated with the concave cavity.

[0012] In some embodiments, an air inlet channel is formed in the valve wall of the valve body, and the air inlet channel is spaced from the valve cavity, the first passage and the second passage. The air inlet port of the air inlet channel is communicated with the outer side wall of the valve body for externally connecting a positive pressure air source, and the air outlet port of the air inlet channel extends to the end surface of the valve body connected to the valve body end cover 1;

[0013] A first transition air channel and a second transition air channel are arranged on the valve body end cover 1. The air inlet port of the first transition air channel is communicated with the air outlet port of the air inlet channel, and the air outlet port of the second transition air channel is communicated with the concave cavity;

[0014] A valve body end cover 3 is arranged at one end of the valve body end cover 1 away from the valve body. The positive pressure air chamber is formed in the valve body end cover 3. The air inlet port of the positive pressure air chamber is communicated with the air outlet port of the first transition air channel, and the air outlet port of the positive pressure air chamber is communicated with the air inlet port of the second transition air channel.

[0015] In some embodiments, the electromagnetic pilot head is arranged at one end of the valve body end cover 1 away from the valve body and is aligned with the concave cavity; a notch is formed in the side wall of the concave cavity and extends towards the air outlet port of the second transition air channel to form a communication air channel, and the communication air channel communicates the concave cavity and the air outlet port of the second transition air channel.

[0016] In some embodiments, the air inlet channel is an L-shaped air inlet channel, and the air inlet port of the L-shaped air inlet channel is arranged close to the valve body end cover 1.

[0017] In some embodiments, a first sealing gasket and a second sealing gasket are movably embedded at the two axial ends of the valve cavity respectively. The first sealing gasket is located between the valve core and the valve body end cover 1, and the second sealing gasket is located between the valve core and the valve body end cover 2.

[0018] In some embodiments, one end of the first passage penetrates through the valve body to form a first inlet, and the other end of the first passage penetrates through the valve body to form a first outlet; one end of the second passage penetrates through the valve body to form a second inlet, and the other end of the second passage penetrates through the valve body to form a second outlet;

[0019] The first inlet and the second inlet are located on one side of the valve body, and the first outlet and the second outlet are located on the other side of the valve body.

[0020] In some embodiments, a third sealing portion is further provided on the valve core and is located between the first sealing portion and the second sealing portion; the first sealing portion, the second sealing portion, and the third sealing portion are all sealing convex rings coaxially arranged on the outer ring of the valve core, an annular groove is formed on the outer peripheral edge of the sealing convex ring, and an annular sealing ring is embedded in the annular groove;

[0021] The first inlet and the first outlet are arranged axially offset along the valve cavity, an avoidance annular groove one is formed on the inner wall of the valve cavity, and the avoidance annular groove one is located at one end of the first inlet away from the first outlet; the second inlet and the second outlet are arranged axially offset along the valve cavity, an avoidance annular groove two is formed on the inner wall of the valve cavity, and the avoidance annular groove two is located at one end of the second inlet away from the second outlet; the area of the inner wall of the valve cavity except the avoidance annular groove one and the avoidance annular groove two is a sealing area;

[0022] The third sealing portion is located between the first passage and the second passage and is in sealing cooperation with the sealing area of the inner wall of the valve cavity, and the third sealing portion is used to keep the first passage and the second passage separated;

[0023] When the double passages are closed, both the first sealing portion and the second sealing portion are in sealing cooperation with the corresponding sealing area of the inner wall of the valve cavity;

[0024] When the double passages are opened, the first sealing portion and the second sealing portion respectively move to the avoidance annular groove one and the avoidance annular groove two.

[0025] On the other hand, the present invention provides a gas detection system, including a series valve bank and a detection unit, the series valve bank includes a bracket and a plurality of double-inlet and double-outlet solenoid valves as described above; wherein:

[0026] Two air flow channels are arranged side by side in the bracket, a plurality of the double-inlet and double-outlet solenoid valves are arranged on the bracket along the extending direction of the air flow channels, and in any one of the double-inlet and double-outlet solenoid valves, the outlets of the first passage and the second passage are respectively communicated with the two air flow channels, and the inlets of the first passage and the second passage can be respectively connected to two air pipes of the same pitot tube; the pitot tube is used to externally receive the pipeline to be inspected;

[0027] Both of the two air flow channels of the bracket are connected to the detection unit, and the detection unit can detect the gas in the pipeline to be inspected.

[0028] In some embodiments, the detection unit includes a sample inlet main pipe, detection branch pipes, a flow rate detection component, a composition and concentration detection component, a flow velocity detection component, a control system, a filtering component, and a water removal component. The sample inlet end of the sample inlet main pipe is connected to the two air flow channels of the bracket, and the sample outlet end of the sample inlet main pipe is connected to three of the detection branch pipes. The flow rate detection component, the composition and concentration detection component, and the flow velocity detection component are respectively arranged on the three detection branch pipes; the control system is communicatively connected to the flow rate detection component, the composition and concentration detection component, and the flow velocity detection component; the filtering component and the water removal component are both arranged on the sample inlet main pipe, and the filtering component and the water removal component are respectively used for filtering and draining the gas to be detected.

[0029] In some embodiments, the gas detection system further includes a positive pressure gas source, and the positive pressure gas chambers of any one of the double-inlet and double-outlet solenoid valves are all connected to the positive pressure gas source; the positive pressure gas source is used to provide the positive pressure gas flow to the positive pressure gas chambers.

[0030] In some embodiments, the positive pressure gas source is a positive pressure pump.

[0031] The present invention has achieved the following technical effects compared with the prior art:

[0032] The double-inlet and double-outlet solenoid valve proposed by the present invention adopts a double-path design of double-inlet and double-outlet, and can realize that the two inlets of the double path are respectively and simultaneously connected to the two air pipes of the pitot tube. Compared with the ordinary single-inlet and single-outlet solenoid valve, the total number of solenoid valves can be reduced by half, so as to solve the problems of the existing ordinary single-inlet and single-outlet solenoid valve connecting the pitot tube, such as a large number of solenoid valves, not only a long installation period, low working efficiency, but also a large volume and weight of the equipment, and great difficulty in transportation and handling.

[0033] In addition, by integrally arranging the positive pressure gas chamber and the electromagnetic pilot head at the same end of the valve body, the positive pressure gas chamber can be used to apply a positive pressure gas flow to the valve core to close the valve after the electromagnetic pilot head is powered off, which can not only avoid the problem of impurity residue in the valve cavity and poor closing of the valve core, but also the positive pressure gas flow can realize the rapid closing of the valve and ensure that the solenoid valve is in a normally closed state. The positive pressure gas chamber and the electromagnetic pilot head cooperate with each other and perform their respective functions, which can ensure that the solenoid valve can be reliably opened and closed under different working conditions, and is especially suitable for the coal mine air flow channel with more impurities.

[0034] The gas detection system proposed by the present invention uses the above double-inlet and double-outlet solenoid valve for gas supply, which can meet the flow supply requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of the overall structure of a double-inlet and double-outlet solenoid valve disclosed in an embodiment of the present invention;

[0037] Figure 2 It is a cross-sectional schematic diagram of the solenoid valve disclosed in the embodiment of the present invention when the two channels are in a closed state;

[0038] Figure 3 It is a cross-sectional schematic diagram of the solenoid valve disclosed in the embodiment of the present invention when the two channels are in an open state;

[0039] Figure 4 A schematic diagram of the working principle of the positive pressure airflow of the solenoid valve disclosed in an embodiment of the present invention (in the figure, the dual passages of the solenoid valve are still in an open state);

[0040] Figure 5 for Figure 2 or Figure 3 Schematic diagram of the right end face of the valve body;

[0041] Figure 6 It is a schematic diagram of the structure of the valve core in the solenoid valve disclosed in the embodiment of the present invention;

[0042] Figure 7 It is a schematic structural diagram of the end of the valve body end cover 1 that is connected to the valve body according to an embodiment of the present invention;

[0043] Figure 8 It is a structural schematic diagram of one end of the valve body end cover three disclosed in an embodiment of the present invention that is butted against the valve body end cover one;

[0044] Figure 9 It is a schematic diagram of the main structure of the series valve row disclosed in an embodiment of the present invention;

[0045] Figure 10 It is a schematic diagram of the top view of the structure of the series valve row disclosed in an embodiment of the present invention;

[0046] Figure 11 It is a schematic diagram of the overall structure of the gas detection system disclosed in an embodiment of the present invention.

[0047] In the figure, reference numerals are: 100, gas detection system;

[0048] 1. Double-inlet and double-outlet solenoid valve; 11. Valve body; 111. Inlet airway; 12. Valve cavity; 121. Avoidance ring groove 1; 122. Avoidance ring groove 2; 13. Passage 1; 131. Inlet 1; 132. Outlet 1; 14. Passage 2; 141. Inlet 2; 142. Outlet 2; 15. Spool; 151. Sealing part 1; 152. Sealing part 2; 153. Sealing part 3; 154. End sealing ring 1; 155. End sealing ring 2; 156. Sealing convex ring; 157. Annular groove; 158. Annular sealing ring; 16. Electromagnetic pilot head; 17. Valve body end cover 1; 171. Concave cavity; 172. Transition airway 1; 173. Transition airway 2; 174. Notch; 175. Connecting airway; 18. Valve body end cover 2; 19. Valve body end cover 3; 191. Positive pressure air chamber;

[0049] 2. Series valve bank; 21. Bracket;

[0050] 3. Positive pressure air source;

[0051] 4. Detection unit; 41. Sampling main pipe; 42. Detection branch pipe; 43. Flow rate detection component; 44. Component and concentration detection component; 45. Flow velocity detection component; 46. Control system; 47. Filter component; 48. Water removal component;

[0052] 5. Pitot tube;

[0053] 6. Pipeline under test. Detailed implementation mode

[0054] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0055] The purpose of the present invention is to provide a double-inlet and double-outlet solenoid valve and a gas detection system including the double-inlet and double-outlet solenoid valve. The solenoid valve adopts a double-pass design with double inlets and double outlets. The inlets of the double passages can be respectively connected to the two air pipes of the pitot tube to solve the problems that when using ordinary single-inlet and single-outlet solenoid valves, the number of solenoid valves is large, not only the installation period is long, the working efficiency is low, but also the equipment volume is large, the weight is large, and the transportation and handling are difficult, etc.

[0056] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0057] Embodiment 1

[0058] As Figures 1 to 4As shown, this embodiment provides a double-inlet and double-outlet solenoid valve 1, including a valve body 11, a valve core 15, an electromagnetic pilot head 16 and a positive pressure air chamber 191, a valve cavity 12, a passage 1 13 and a passage 2 14 are arranged in the valve body 11, the passage 1 13 and the passage 2 14 are cross-connected with the valve cavity 12, the valve core 15 is movably inserted in the valve cavity 12, and the valve core 15 is provided with a sealing part 151 and a sealing part 2 152 corresponding to the passage 1 13 and the passage 2 14 respectively, the sealing part 151 and the sealing part 2 152 can respectively block the passage 1 13 and the passage 2 14 when the valve core 15 is in a closed state, and open the passage 1 13 and the passage 2 14 when the valve core 15 is in an open state. The electromagnetic pilot head 16 is arranged at one end of the valve body 11. The electromagnetic pilot head 16 is a conventional design in ordinary electromagnetic valves. When the electromagnetic pilot head 16 is energized, it can generate magnetism and adsorb the valve core 15 to drive the valve core 15 to move, release the blocking effect of the sealing part 151 and the sealing part 2 152, so that the passage 1 13 and the passage 2 14 are opened at the same time to form a double-inlet and double-outlet double passage. At this time, the entire double-inlet and double-outlet electromagnetic valve 1 is in an open state; the positive pressure chamber 191 and the electromagnetic pilot head 16 are arranged at the valve At the same end of the body 11, the positive pressure air chamber 191 and the electromagnetic pilot head 16 work alternately, that is, when the electromagnetic pilot head 16 needs to be energized to open the dual channels, the positive pressure air chamber 191 has no effect on the valve core 15, and when the dual channels need to be closed, the electromagnetic pilot head 16 is first powered off, and the positive pressure air chamber 191 is used to apply positive pressure airflow to the end of the valve core 15 after the electromagnetic pilot head 16 is powered off, so as to drive the valve core 15 to move in the opposite direction, thereby closing the dual channels. At this time, the entire double-inlet and double-outlet solenoid valve 1 is in a closed state. The above-mentioned double-inlet and double-outlet solenoid valve 1 adopts a double-inlet and double-outlet dual-channel design, and the inlets of the dual channels can be connected to the two-way air pipes of the pitot tube respectively. One can replace two single-way inlet and outlet solenoid valves, which can solve the problems of a large number of solenoid valves when ordinary single-way inlet and outlet solenoid valves are used, which not only has a long installation period and low working efficiency, but also has large equipment size, heavy weight, and difficulty in transportation and handling.

[0059] Some possible implementations, such as Figure 2 and Figure 3As shown, the valve cavity 12 penetrates through the axial two ends of the valve body 11. At the same time, a valve body end cover one 17 and a valve body end cover two 18 are respectively arranged at the axial two ends of the valve body 11. And a concave cavity 171 for the valve core 15 to extend into is arranged at one end of the valve body end cover one 17 facing the valve body 11. The concave cavity 171 is columnar. After the valve body end cover one 17 and the valve body 11 are tightly assembled by bolts, the concave cavity 171 is coaxially communicated with the end of the valve cavity 12. When the electromagnetic pilot head 16 is energized, the valve core 15 is driven to move towards the inside of the concave cavity 171. The concave cavity 171 serves to provide an insertion space for the end of the valve core 15. It should be noted that the concave cavity 171 is communicated with the end of the valve cavity 12, but cannot be communicated with the passage one 13 and the passage two 14. Based on this, an end seal ring one 154 and an end seal ring two 155 are respectively arranged at the axial two ends of the valve core 15. As Figure 3 shown, the end seal ring one 154 and the end seal ring two 155 are respectively arranged close to the valve body end cover two 18 and the valve body end cover one 17. Whether the valve core 15 is in the open state or the closed state, the end seal ring one 154 and the end seal ring two 155 are in sealed contact with the inner wall of the valve cavity 12, so as to ensure that the passage one 13 and the passage two 14 are always isolated from the outside of the valve body 11.

[0060] In some feasible embodiments, as Figure 1 and Figure 4 shown, the electromagnetic pilot head 16 and the positive pressure air chamber 191 are both arranged on the valve body end cover one 17, and the air outlet end of the positive pressure air chamber 191 is communicated with the concave cavity 171, so that the positive pressure air flow can be applied to the end of the valve core 15.

[0061] In some feasible embodiments, an air inlet passage 111 is formed inside the valve wall of the valve body 11, and the air inlet passage 111 is spaced from the valve cavity 12, the first passage 13, and the second passage 14. The air inlet port of the air inlet passage 111 communicates with the outer side wall of the valve body 11 for connecting to a positive pressure air source externally, and the air outlet port of the air inlet passage 111 extends to the end face of the valve body 11 connected to the first valve body end cover 17. Based on this, a first transition air passage 172 and a second transition air passage 173 are provided on the first valve body end cover 17. Both the first transition air passage 172 and the second transition air passage 173 penetrate through the thickness direction of the first valve body end cover 17, and the first transition air passage 172 and the second transition air passage 173 are spaced from each other. Among them, the air inlet port of the first transition air passage 172 communicates with the air outlet port of the air inlet passage 111, and the air outlet port of the second transition air passage 173 communicates with the concave cavity 171; a third valve body end cover 19 is provided at one end of the first valve body end cover 17 away from the valve body 11, and the third valve body end cover 19 can be fixedly connected to the first valve body end cover 17 by bolts or screws; the aforementioned positive pressure air chamber 191 is formed inside the third valve body end cover 19, and the positive pressure air chamber 191 is integrally a curved passage. The extending form of the passage of the positive pressure air chamber 191 is not limited. It can adopt a regular U shape or S shape, etc., or can also adopt an irregular flow channel shape design, but ultimately it should be ensured that both the air inlet port and the air outlet port of the curved passage of the positive pressure air chamber 191 are located on the end face of the third valve body end cover 19 facing the first valve body end cover 17 (as Figure 8 shown, the two small squares respectively represent the air inlet port and the air outlet port of the positive pressure air chamber 191), where the air inlet port of the positive pressure air chamber 191 communicates with the air outlet port of the first transition air passage 172, and the air outlet port of the positive pressure air chamber 191 communicates with the air inlet port of the second transition air passage 173. Thus far, the above-mentioned air inlet passage 111, the first transition air passage 172, the positive pressure air chamber 191, the second transition air passage 173, and the concave cavity 171 are sequentially connected to form a positive pressure air flow passage. As Figure 4 shown, the positive pressure air flow sequentially enters the positive pressure air chamber 191 through the air inlet passage 111 and the first transition air passage 172. After flowing through the entire positive pressure air chamber 191, it is discharged from the air outlet port of the positive pressure air chamber 191, and finally enters the concave cavity 171 through the second transition air passage 173 and acts on the end of the valve core 15 until the air flow pushes the valve core 15 to reset, and the solenoid valve is closed. Figure 4 In, the arrow direction in the positive pressure air flow passage is the flow direction of the positive pressure air flow. The positive pressure air flow passage formed by sequentially connecting the air inlet passage 111, the first transition air passage 172, the positive pressure air chamber 191, the second transition air passage 173, and the concave cavity 171 penetrates through the valve body 11, the first valve body end cover 17, and the third valve body end cover 19 at the same time, and the positive pressure air flow passage adopts a circuitous structure. This design not only cleverly realizes the integration of the flow passage in a small and precise solenoid valve to enable the positive pressure air flow to act on the valve core 15 smoothly, but also realizes the use of the positive pressure air flow passage to extend the flow path of the positive pressure air flow to buffer the pressure of the positive pressure air flow, avoiding the direct action of the positive pressure air flow discharged from the positive pressure air source on the valve core 15 and causing damage to the valve core 15, and improving the performance of the solenoid valve.

[0062] The positive pressure air flow and the electromagnetic pilot head 16 act alternately in a cycle, enabling the solenoid valve to open and close multiple times in a cycle.

[0063] In some feasible embodiments, such as Figure 1 and Figure 4 shown, the electromagnetic pilot head 16 is arranged at one end of the valve body end cover 17 away from the valve body 11, and the electromagnetic pilot head 16 is aligned with the concave cavity 171. This design enables the electromagnetic pilot head 16 to quickly and accurately suck the valve core 15 into the concave cavity 171 after being energized. Based on this design, the end of the concave cavity 171 cannot directly open to communicate with the aforementioned second transition air passage 173. Therefore, in this solution, a notch 174 is opened on the side wall of the concave cavity 171, and the notch 174 penetrates the open end of the concave cavity 171 in the axial direction of the concave cavity 171. As Figure 7 shown, the notch 174 extends towards the air outlet port of the second transition air passage 173 and forms a communication air passage 175. The communication air passage 175 connects the concave cavity 171 and the air outlet port of the second transition air passage 173. Based on this, the positive pressure air flow in the second transition air passage 173 can enter the concave cavity 171 from the side wall of the concave cavity 171 through the communication air passage 175. It should be noted here that the positive pressure air flow entering the concave cavity 171 is mainly divided into two paths: the first path flows into the gap between the bottom end of the concave cavity 171 and the end of the valve core 15 and acts on the end of the valve core 15, and the second path flows through the annular gap between the concave cavity 171 and the valve core 15 to the open end of the concave cavity 171, thereby acting on the second end seal ring 155 to assist the first path of air flow in pushing the valve core 15.

[0064] In some feasible embodiments, in order to ensure the sealing performance of the aforementioned positive pressure air flow passage, sealing rings are provided on both the valve body end cover 17 and the valve body end cover 3 19. The sealing rings are mainly arranged on the outer periphery of the air inlet port of the first transition air passage 172, the outer periphery of the air outlet port of the second transition air passage 173, the outer periphery of the communication air passage 175, the outer periphery of the concave cavity 171, the outer periphery of the air outlet port of the positive pressure air chamber 191, and the outer periphery of the air inlet port of the positive pressure air chamber 191. This design can ensure the sealing performance of the connections of each air passage and also ensure the sealing performance of each air passage itself.

[0065] In some feasible embodiments, the shape of the air inlet passage 111 is not limited and can be a regular shape such as an L shape or an irregular shape. Taking the L-shaped air inlet passage as an example for the air inlet passage 111, the air inlet port of the L-shaped air inlet passage is arranged close to the valve body end cover 17, and the air outlet port of the L-shaped air inlet passage penetrates the end of the valve body 11.

[0066] In some feasible embodiments, a first sealing gasket and a second sealing gasket are respectively movably fitted at the axial two ends of the valve cavity 12. The first sealing gasket is located between the valve core 15 and the first valve body end cover 17, and the second sealing gasket is located between the valve core 15 and the second valve body end cover 18. The first sealing gasket and the second sealing gasket can respectively protect the two ends of the valve core 15 to prevent the ends from being damaged during the reciprocating movement of the valve core 15, which is beneficial to improving the service life of the solenoid valve.

[0067] In some feasible embodiments, such as Figures 2 to 4 shown, one end of the first passage 13 communicates with the valve body 11 to form a first inlet 131, and the other end of the first passage 13 communicates with the valve body 11 to form a first outlet 132; one end of the second passage 14 communicates with the valve body 11 to form a second inlet 141, and the other end of the second passage 14 communicates with the valve body 11 to form a second outlet 142; the first inlet 131 and the second inlet 141 are located on one side of the valve body 11, and the first outlet 132 and the second outlet 142 are located on the other side of the valve body 11. The intake port of the aforementioned L-shaped intake passage is preferably located on the same side of the valve body 11 as the first inlet 131 and the second inlet 141.

[0068] In some feasible embodiments, a third sealing portion 153 is further provided on the valve core 15 between the first sealing portion 151 and the second sealing portion 152; the first sealing portion 151, the second sealing portion 152 and the third sealing portion 153 are all sealing convex rings 156 coaxially arranged on the outer circle of the valve core 15. As Figure 6 shown, the sealing convex ring 156 protrudes radially outward relative to the main axis of the valve core 15, and an annular groove 157 is formed on the outer peripheral edge of the sealing convex ring 156, and an annular sealing ring 158 is installed in the annular groove 157. The structures of the aforementioned first end sealing ring 154 and the second end sealing ring 155 are the same as those of the first sealing portion 151. After the valve core 15 is installed in the valve cavity 12, the annular sealing rings 158 of each sealing portion are in sealing contact with the valve cavity 12. As Figure 2 and Figure 3As shown, on passage one 13, inlet one 131 and outlet one 132 are arranged axially offset along the valve cavity 12. A relief ring groove one 121 is provided on the inner wall of the valve cavity 12 adjacent to passage one 13, and the relief ring groove one 121 is located at one end of inlet one 131 away from outlet one 132, and the relief ring groove one 121 communicates with inlet one 131; correspondingly, on passage two 14, inlet two 141 and outlet two 142 are arranged axially offset along the valve cavity 12. A relief ring groove two 122 is provided on the inner wall of the valve cavity 12 adjacent to passage two 14, and the relief ring groove two 122 is located at one end of inlet two 141 away from outlet two 142, and the relief ring groove two 122 communicates with inlet two 141. It is set that the areas on the inner wall of the valve cavity 12 except the relief ring groove one 121 and the relief ring groove two 122 are all sealing areas, and the inner diameter of the sealing area is smaller than the inner diameters of the relief ring groove one 121 and the relief ring groove two 122. The annular sealing rings 158 of each sealing part on the valve core 15 are all in sealing contact with the sealing area of the valve cavity 12. Sealing part three 153 is located between passage one 13 and passage two 14 and is in sealing cooperation with the sealing area of the inner wall of the valve cavity 12. Sealing part three 153 is used to keep passage one 13 and passage two 14 always separated and not communicating. As described above, when the double passages are closed, the annular sealing rings 158 of sealing part one 151 and sealing part two 152 are all in sealing cooperation with the corresponding sealing areas on the inner wall of the valve cavity 12, as Figure 2 shown. At this time, inlet one 131 and outlet one 132 of passage one 13 are respectively located on the two axial sides of sealing part one 151, and inlet two 141 and outlet two 142 of passage two 14 are respectively located on the two axial sides of sealing part two 152; when the double passages are opened, sealing part one 151 and sealing part two 152 respectively move to the relief ring groove one 121 and the relief ring groove two 122, as Figure 3 shown. At this time, an annular gap is formed between sealing part one 151 and the relief ring groove one 121, and between sealing part two 152 and the relief ring groove two 122. This annular gap realizes the respective communication of the inlets and outlets of the two passages.

[0069] In some embodiments, generally only one sealing part one 151 and sealing part two 152 are provided; the sealing part three 153 between sealing part one 151 and sealing part two 152 can be continuously provided with multiple layers to enhance the partitioning effect on the two passages. As Figure 2 and Figure 3 shown, two sealing part three 153 are continuously provided between sealing part one 151 and sealing part two 152.

[0070] The following specifically describes the usage method and opening and closing principle of the double-inlet and double-outlet solenoid valve 1 of this embodiment:

[0071] During use, the initial state is Figure 2 the closed state shown. The electromagnetic pilot head 16 is energized to adsorb the valve core 15, causing the valve core 15 to move to the right toFigure 3 The state shown in the figure, at this time, the first sealing part 151 and the second sealing part 152 are respectively moved to the first avoidance annular groove 121 and the second avoidance annular groove 122. The first inlet 131 and the first outlet 132, the second inlet 141 and the second outlet 142 are respectively correspondingly communicated to form a double-path that can intake air simultaneously. At this time, it is the open state of the solenoid valve. The third sealing part 153 is used to separate the two paths.

[0072] The electromagnetic pilot head 16 is powered off, and at the same time, a positive pressure air flow is introduced into the positive pressure air chamber 191, which can make the positive pressure air flow act on the end of the valve core 15, push the valve core 15 in the reverse direction (to the left) to reset until the first sealing part 151 and the second sealing part 152 are respectively away from the first avoidance annular groove 121 and the second avoidance annular groove 122, and return to the sealing state with the sealed area of the valve cavity 12. At this time, it is the closed state of the solenoid valve, as Figure 2 shown.

[0073] The above double-inlet and double-outlet solenoid valve 1 adopts a double-path design of double-inlet and double-outlet, and can realize that the two inlets of the double-path are respectively and simultaneously connected to the two air pipes of the pitot tube. Compared with the ordinary single-inlet and single-outlet solenoid valve, the total number of solenoid valves can be reduced by half. Thus, the problems that when the existing ordinary single-inlet and single-outlet solenoid valves are used to connect the pitot tube, the number of solenoid valves is large, not only the installation period is long, the working efficiency is low, but also the equipment volume is large, the weight is large, and the transportation and handling are difficult can be solved. In addition, by integrating the positive pressure air chamber 191 and the electromagnetic pilot head 16 at the same end of the valve body, after the electromagnetic pilot head 16 is powered off, the positive pressure air chamber 191 can apply a positive pressure air flow to the valve core 15 to close the valve. This can not only avoid the problem of impurity residue in the valve cavity and the poor closing of the valve core, but also the positive pressure air flow can realize the rapid closing of the valve, ensuring that the solenoid valve is in the normally closed state. The positive pressure air chamber 191 and the electromagnetic pilot head 16 cooperate with each other and perform their respective functions, which can ensure that the solenoid valve can be reliably opened and closed under different working conditions, and is especially suitable for the coal mine air flow channel with more impurities.

[0074] Embodiment 2

[0075] As Figure 11 shown, this embodiment provides a gas detection system 100, including a series valve bank 2 and a detection unit 4. The series valve bank 2 includes a bracket 21 and the double-inlet and double-outlet solenoid valve 1 disclosed in Embodiment 1. Among them: two air flow channels are arranged side by side in the bracket 21, and a plurality of double-inlet and double-outlet solenoid valves 1 are arranged on the bracket 21 along the extension direction of the air flow channels. In any double-inlet and double-outlet solenoid valve 1, the outlets of the first path 13 and the second path 14 are respectively communicated with the two air flow channels, and the inlets of the first path 13 and the second path 14 can be respectively connected to the two air pipes of the same pitot tube 5; the pitot tube 5 is used to receive the pipeline 6 to be detected outside; the two air flow channels of the bracket 21 are both connected to the detection unit 4, and the detection unit 4 can detect the gas in the pipeline 6 to be detected. 10 to 20 double-inlet and double-outlet solenoid valves 1 can be simultaneously arranged on the series valve bank 2 for convenient use.

[0076] The above-mentioned detection unit 4 includes a sampling main pipe 41, detection branch pipes 42, a flow rate detection component 43, a component and concentration detection component 44, a flow velocity detection component 45, and a control system 46. Among them, the sampling end of the sampling main pipe 41 is connected to the two gas flow channels of the support 21, and the sampling end of the sampling main pipe 41 is connected to three detection branch pipes 42. The flow rate detection component 43, the component and concentration detection component 44, and the flow velocity detection component 45 are respectively arranged on the three detection branch pipes 42; the control system 46 is communicatively connected to the flow rate detection component 43, the component and concentration detection component 44, and the flow velocity detection component 45. The control system 46 can receive and process the detection signals of each component. Detection components with different functions are configured on the three detection branch pipes 42. In order to accurately control each detection branch pipe 42, it is preferably to configure an electromagnetic valve on each detection branch pipe 42 to flexibly control the on / off of the branch pipe. The operator can open the corresponding detection branch pipe 42 according to the parameter detection requirements, and the operation is simple and convenient.

[0077] The gas detection system 100 is mainly applied to the detection of coal mine air flow, and can detect parameters such as the concentration, pressure, and flow rate of mine fluids. Considering the complex composition of mine air flow, a filtering component 47 and a water removal component 48 are also arranged in the detection unit 4. The filtering component 47 and the water removal component 48 are both arranged on the sampling main pipe 41. Before the gas to be detected reaches the detection branch pipe 42, the filtering component 47 and the water removal component 48 can respectively filter and remove water from the gas to be detected, avoiding moisture or impurities from affecting the detection accuracy and also avoiding moisture or impurities from damaging the detection components. The flow rate detection component 43, the component and concentration detection component 44, the flow velocity detection component 45, the filtering component 47, and the water removal component 48 are all finished products, and the specific details are not elaborated here.

[0078] In some feasible embodiments, the gas detection system 100 is also independently configured with a positive pressure gas source, and the air inlet channels 111 of any one of the double-inlet and double-outlet electromagnetic valves 1 in the series valve row 2 are all connected to the positive pressure gas source. The positive pressure gas source can be a positive pressure pump or a high-pressure gas storage tank, and can provide positive pressure air flow to the positive pressure air chamber 191.

[0079] When the above-mentioned gas detection system 100 is used, multiple series valve rows 2 can be used in series. The inlets of the first path 13 and the second path 14 of each double-inlet and double-outlet electromagnetic valve 1 on each series valve row 2 are connected to the two air pipes of the same pitot tube 5, so as to be connected to the pipeline 6 to be detected through the pitot tube 5. The pitot tube 5 is a finished product, and its specific structure and working principle are not elaborated here. When the gas detection system 100 is used, each double-inlet and double-outlet electromagnetic valve 1 is independently started, and each time a detection gas source or a detection target is replaced, a double-inlet and double-outlet electromagnetic valve 1 will be replaced. Taking the example that n double-inlet and double-outlet electromagnetic valves 1 are serially arranged on the series valve row 2:

[0080] Send an electromagnetic valve opening command to the No. 1 double-inlet and double-outlet solenoid valve 1. The electromagnetic pilot head 16 is energized and starts, pulling the valve core 15 to open two passages. At this time, the No. 1 double-inlet and double-outlet solenoid valve 1 introduces the airflow to be detected into the sample introduction main pipe 41. Then, the airflow to be detected is divided into three paths and enters the flow detection component 43, the component and concentration detection component 44, and the flow velocity detection component 45 respectively for corresponding parameter detection. To ensure sufficient airflow power, a negative pressure pump can be configured on each detection branch pipe 42 to extract air.

[0081] After the detection is completed, cut off the power supply to the electromagnetic pilot head 16 of the No. 1 double-inlet and double-outlet solenoid valve 1. At the same time, the positive pressure air source 3 supplies positive pressure airflow to the No. 1 double-inlet and double-outlet solenoid valve 1, pushing the valve core 15 to the solenoid valve closed state. So far, the first detection target has completed the detection, and during the detection of this target, the other double-inlet and double-outlet solenoid valves 1 are all in the closed state.

[0082] After that, start the No. 2 double-inlet and double-outlet solenoid valve 1, the No. 3 double-inlet and double-outlet solenoid valve 1,... the No. n double-inlet and double-outlet solenoid valve 1 to complete a cycle of detection.

[0083] It should be noted that each index detection needs to last for a certain period of time to ensure the stability of the data for a period of time. For example, after 3 minutes, the next set of index detections can be carried out. Especially when detecting the gas component concentration, the gas of the previous detection needs to be discharged and replaced clean before the next detection, and the data can be accurate and reliable.

[0084] The above gas detection system 100 uses a double-pass solenoid valve, which can meet the flow supply requirements. In addition, the filter component 47 and the water removal component 48 can ensure that the airflow to be detected is replaced clean, which can not only improve the data detection accuracy, but also reduce the failure rate of components and extend the service life of the equipment.

[0085] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of narration and are not used to limit the implementation scope of the present invention. The change or adjustment of their relative relationships, without substantial change of the technical content, should also be regarded as the scope in which the present invention can be implemented.

[0086] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A double-inlet and double-outlet solenoid valve, characterized in that: include: A valve body (11) is provided with a valve cavity (12), a first passage (13) and a second passage (14) therein, wherein the first passage (13) and the second passage (14) are both cross-connected with the valve cavity (12); A valve core (15) is movably inserted into the valve cavity (12), and the valve core (15) is provided with a sealing portion 1 (151) and a sealing portion 2 (152) corresponding to the passage 1 (13) and the passage 2 (14) respectively; An electromagnetic pilot head (16) is arranged at one end of the valve body (11), and when the electromagnetic pilot head (16) is energized, it can drive the valve core (15) to move, so that the passage 1 (13) and the passage 2 (14) are opened at the same time to form a double passage; The positive pressure air chamber (191) is arranged at the same end of the valve body (11) as the electromagnetic pilot head (16). After the electromagnetic pilot head (16) is powered off, the positive pressure air chamber (191) can apply positive pressure airflow to the end of the valve core (15) to drive the valve core (15) to move in the reverse direction and close the double passage.

2. The double-inlet and double-outlet solenoid valve according to claim 1, characterized in that: The valve cavity (12) passes through the two axial ends of the valve body (11); a valve body end cover (17) and a valve body end cover (18) are respectively provided at the two axial ends of the valve body (11), and a concave cavity (171) for the valve core (15) to extend into is provided at one end of the valve body end cover (17) facing the valve body (11); The electromagnetic pilot head (16) and the positive pressure air chamber (191) are both arranged on the valve body end cover (17), and the air outlet end of the positive pressure air chamber (191) is connected to the concave cavity (171).

3. The double-inlet and double-outlet solenoid valve according to claim 2, characterized in that: An air inlet (111) is provided in the valve wall of the valve body (11), and the air inlet (111) is spaced apart from the valve cavity (12), the passage 1 (13) and the passage 2 (14); an air inlet port of the air inlet (111) is in communication with the outer wall of the valve body (11) for connecting to an external positive pressure air source; and an air outlet port of the air inlet (111) extends to an end surface of the valve body (11) connected to the valve body end cover 1 (17); The valve body end cover 1 (17) is provided with a transition air channel 1 (172) and a transition air channel 2 (173), the air inlet port of the transition air channel 1 (172) is in communication with the air outlet port of the air inlet channel (111), and the air outlet port of the transition air channel 2 (173) is in communication with the concave cavity (171); A valve body end cover three (19) is provided at one end of the valve body end cover one (17) away from the valve body (11); the positive pressure air chamber (191) is opened in the valve body end cover three (19); the air inlet port of the positive pressure air chamber (191) is communicated with the air outlet port of the transition air duct one (172); and the air outlet port of the positive pressure air chamber (191) is communicated with the air inlet port of the transition air duct two (173).

4. The double-inlet and double-outlet solenoid valve according to claim 3, characterized in that: The electromagnetic pilot head (16) is arranged at an end of the valve body end cover (17) away from the valve body (11), and the electromagnetic pilot head (16) is aligned with the concave cavity (171); a notch (174) is provided on the side wall of the concave cavity (171), and the notch (174) extends toward the air outlet port of the transition air duct (173) to form a connecting air duct (175), and the connecting air duct (175) connects the concave cavity (171) and the air outlet port of the transition air duct (173).

5. The double-inlet and double-outlet solenoid valve according to claim 3 or 4, characterized in that: The air inlet passage (111) is an L-shaped air inlet passage, and the air inlet port of the L-shaped air inlet passage is arranged close to the valve body end cover (17).

6. The double-inlet and double-outlet solenoid valve according to any one of claims 2 to 4, characterized in that: A sealing gasket 1 and a sealing gasket 2 are movably embedded at the axial ends of the valve cavity (12), respectively, and the sealing gasket 1 is located between the valve core (15) and the valve body end cover 1 (17), and the sealing gasket 2 is located between the valve core (15) and the valve body end cover 2 (18).

7. The double-inlet and double-outlet solenoid valve according to any one of claims 2 to 4, characterized in that: One end of the passage 1 (13) is connected to the valve body (11) to form an inlet 1 (131), and the other end of the passage 1 (13) is connected to the valve body (11) to form an outlet 1 (132); one end of the passage 2 (14) is connected to the valve body (11) to form an inlet 2 (141), and the other end of the passage 2 (14) is connected to the valve body (11) to form an outlet 2 (142); The first inlet (131) and the second inlet (141) are located on one side of the valve body (11), and the first outlet (132) and the second outlet (142) are located on the other side of the valve body (11).

8. The double-inlet and double-outlet solenoid valve according to claim 7, characterized in that: The valve core (15) is also provided with a sealing portion three (153) located between the sealing portion one (151) and the sealing portion two (152); the sealing portion one (151), the sealing portion two (152) and the sealing portion three (153) are all sealing convex rings (156) coaxially arranged on the outer ring of the valve core (15); an annular groove (157) is provided on the outer peripheral edge of the sealing convex ring (156), and an annular sealing ring (158) is embedded in the annular groove (157); The inlet 1 (131) and the outlet 1 (132) are arranged in an axially offset manner along the valve cavity (12); an avoidance ring groove 1 (121) is provided on the inner wall of the valve cavity (12), and the avoidance ring groove 1 (121) is located at the end of the inlet 1 (131) away from the outlet 1 (132); the inlet 2 (141) and the outlet 2 (142) are arranged in an axially offset manner along the valve cavity (12); an avoidance ring groove 2 (122) is provided on the inner wall of the valve cavity (12), and the avoidance ring groove 2 (122) is located at the end of the inlet 2 (141) away from the outlet 2 (142); the areas of the inner wall of the valve cavity (12) other than the avoidance ring groove 1 (121) and the avoidance ring groove 2 (122) are all sealing areas; The sealing portion three (153) is located between the passage one (13) and the passage two (14), and is in sealing cooperation with the sealing area of ​​the inner wall of the valve cavity (12), and the sealing portion three (153) is used to keep the passage one (13) and the passage two (14) separated; When the double passages are closed, the sealing portion 1 (151) and the sealing portion 2 (152) are both in sealing cooperation with the corresponding sealing areas on the inner wall of the valve cavity (12); When the double passage is opened, the sealing part 1 (151) and the sealing part 2 (152) move to the avoidance ring groove 1 (121) and the avoidance ring groove 2 (122) respectively.

9. A gas detection system, characterized in that: It comprises a series valve row (2) and a detection unit (4), wherein the series valve row (2) comprises a support seat (21) and a double-inlet and double-outlet solenoid valve (1) according to any one of claims 1 to 8; wherein: Two air flow channels are arranged side by side in the support (21); a plurality of double-inlet and double-outlet solenoid valves (1) are arranged on the support (21) along the extension direction of the air flow channels; and in any one of the double-inlet and double-outlet solenoid valves (1), the outlets of the passage 1 (13) and the passage 2 (14) are respectively connected to the two air flow channels, and the inlets of the passage 1 (13) and the passage 2 (14) can be respectively connected to two air pipes of the same Pitot tube (5); the Pitot tube (5) is used for an external inspection pipeline (6); The two air flow channels of the bracket (21) are both connected to the detection unit (4), and the detection unit (4) is capable of detecting the gas in the inspected pipeline (6).

10. The gas detection system according to claim 9, characterized in that: The detection unit (4) comprises a sample injection main pipe (41), a detection branch pipe (42), a flow detection component (43), a component and concentration detection component (44), a flow rate detection component (45), a control system (46), a filtering component (47) and a water removal component (48); the sample injection end of the sample injection main pipe (41) is connected to the two air flow channels of the bracket (21); the sample outlet end of the sample injection main pipe (41) is connected to the three detection branch pipes (42); the flow detection component (43), the component and concentration detection component (44), the flow rate detection component (45), the control system (46), the filtering component (47) and the water removal component (48); The concentration detection component (44) and the flow rate detection component (45) are respectively arranged on the three detection branch pipes (42); the control system (46) is communicatively connected with the flow detection component (43), the component and concentration detection component (44), and the flow rate detection component (45); the filter component (47) and the water removal component (48) are both arranged on the sample injection main pipe (41), and the filter component (47) and the water removal component (48) are respectively used for filtering and draining the gas to be detected.

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