Electric valve for gas defense system

Abstract

The invention relates to the field of fuel gas equipment, in particular to an electric valve for a fuel gas defense system, which comprises a valve body, a valve ball rotatably arranged in the valve body, and a first sealing ring and a second sealing ring both arranged in the valve body, the second sealing ring is positioned on one side of the valve ball close to the air outlet end of the valve body; a sealing shell is further included, the position between the valve body and the valve ball is filled with the sealing shell, the sealing shell wraps the valve ball, one end of the sealing shell is fixed to the first sealing ring, and the other end of the sealing shell is fixed to the second sealing ring. The wall of the sealing shell comprises an inner layer and an outer layer, the inner layer and the outer layer are both flexible, an air cavity is formed between the inner layer and the outer layer, and an air inlet part communicated with the air cavity is arranged on the first sealing ring. According to the scheme, the sealing performance of the electrically operated valve is improved, so that when gas micro leakage between the gas outlet end (including) of the electrically operated valve and the gas equipment (including) is detected, the detection error can be reduced, and the detection accuracy is improved.

Description

Technical Field

[0001] The invention relates to the field of gas equipment, and in particular to an electric valve for a gas defense system. Background Art

[0002] The gas defense system is a set of defense systems composed of safety monitoring and control equipment and equipment information management platform installed at the back end of the user's gas meter. The safety monitoring and control equipment can automatically identify various gas use hazards in the gas use environment and cut off the motor valve to stop gas use, ensuring the gas use safety of users before, during and after gas use. The safety monitoring and control equipment reports the equipment alarm information in real time through communication and informs the user in various ways (SMS, WeChat, message push).

[0003] The gas defense system includes a controller and an electric valve. The controller and the electric valve are electrically connected. The air inlet end of the electric valve is connected to the user's air inlet pipe (the air inlet pipe is used to connect to the gas supply pipeline outside the user). The air outlet end of the electric valve is connected to the gas equipment (such as a gas stove) through an air outlet pipe. The air inlet and air outlet ends of the electric valve are both equipped with pressure sensors. The pressure is detected by the pressure sensor to determine whether there is gas leakage during the gas transportation process.

[0004] In order to detect whether there is gas leakage during the gas transportation process between the electric valve and the gas equipment, the current detection method is to close the electric valve and the gas equipment. At this time, the gas in the air inlet pipe will not enter the air outlet pipe through the electric valve, and some gas will still remain between the air outlet end of the electric valve and the gas equipment. The pressure sensor at the air outlet end of the electric valve is used for detection. If the pressure sensor at the air outlet end of the electric valve detects a drop in gas pressure, it means that there is a gas leakage in the gas transportation between the air outlet end (inclusive) of the electric valve and the gas equipment (inclusive), and further investigation and maintenance are required.

[0005] The detection levels of gas leakage between the outlet end (inclusive) of the electric valve and the gas equipment (inclusive) include micro leakage, medium leakage and large leakage. When detecting micro leakage, since the leakage degree of the detected gas is very weak, if the sealing level of the electric valve is low (the electric valve cannot be 100% sealed), the trace gas in the air inlet pipe may enter the air outlet pipe through the electric valve, or the trace gas in the air outlet pipe enters the air inlet pipe through the electric valve. Since the detection is for micro leakage, even if a trace amount of gas enters the air outlet pipe or flows out of the air outlet pipe, it will have a great impact on the detection result. Therefore, the sealing level of the electric valve is crucial when detecting micro leakage. For medium leakage and large leakage, the detection error caused by the sealing level of the electric valve can be ignored, so the sealing level of the electric valve has little effect on the detection result.

[0006] At present, the electric valve adopts a ball valve, which includes a valve body, a valve ball and a sealing ring. The valve ball is rotatably connected in the valve body, and the sealing ring is located on the left and right sides of the valve ball. The valve ball is sealed by the contact between the sealing ring and the valve ball, but there is still a certain gap between the other parts of the valve ball and the valve body. When the electric valve is in a closed state, it is only sealed by the contact between the sealing ring and the valve ball. The sealing performance of the electric valve cannot meet the requirements of micro-leak detection. Therefore, in the scenario of micro-leak detection, the sealing performance of the electric valve still needs to be improved. Summary of the invention

[0007] The present invention is intended to provide an electric valve for a gas defense system to improve the sealing performance of the electric valve, so that when detecting micro-leakage of gas between the gas outlet end (inclusive) of the electric valve and the gas equipment (inclusive), the detection error can be reduced and the detection accuracy can be improved.

[0008] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an electric valve for a gas defense system, comprising a valve body, a valve ball rotatably arranged inside the valve body, a first sealing ring and a second sealing ring both arranged in the valve body, the first sealing ring being located on the side of the valve ball close to the air inlet end of the valve body, and the second sealing ring being located on the side of the valve ball close to the air outlet end of the valve body; further comprising a sealing shell, the sealing shell being filled between the valve body and the valve ball, the sealing shell covering the valve ball, one end of the sealing shell being fixed on the first sealing ring, and the other end of the sealing shell being fixed on the second sealing ring; the wall of the sealing shell comprising an inner layer and an outer layer, both of which are flexible, an air cavity being provided between the inner layer and the outer layer, and an air inlet portion connected to the air cavity being provided on the first sealing ring.

[0009] The principle and advantage of this solution are: the first sealing ring and the second sealing ring in this application are located on both sides of the valve ball, so as to seal the valve ball, which is the same as the prior art. When the electric valve is in an open state, the channel on the valve ball is connected to the air inlet and air outlet of the electric valve. After the gas enters through the air inlet of the electric valve, it flows to the air outlet of the electric valve through the channel on the valve ball. At this time, since the channel on the valve ball is connected to the air inlet and air outlet, the gas in the electric valve flows preferentially through the channel on the valve ball.

[0010] When the electric valve is closed, the channel on the valve ball is no longer connected to the air inlet and outlet ends of the electric valve, and the gas entering the valve body from the air inlet end is blocked by the valve ball, and the gas will not flow to the air outlet end. At this time, the gas will be forced to flow to other spaces, and the gas enters the air cavity between the inner layer and the outer layer of the sealing shell through the air inlet part. The air pressure in the air cavity increases, and the gas in the air cavity has pressure on the inner layer and the outer layer. The outer layer is tightly attached to the inner wall of the valve body under the action of air pressure, and the inner layer is tightly coated on the valve ball under the action of air pressure. In this way, the gap between the valve ball and the valve body is fully filled with the sealing shell. When the electric valve is in a closed state, the electric valve seal is not only sealed by the first sealing ring and the second sealing ring, but also by the sealing shell for encapsulation sealing. Compared with sealing only by the first sealing ring and the second sealing ring, the valve ball is coated with a large area, and the sealing effect is greatly improved. When detecting micro-leakage of gas between the air outlet end of the electric valve and the gas equipment, the detection error will be reduced, thereby improving the detection accuracy.

[0011] When the electric valve in the present application is closed, the sealing shell expands under the action of the gas and produces elastic deformation, so that the sealing shell can be tightly attached to the valve body and the valve ball respectively. Compared with simply filling ordinary seals in the gap between the valve body and the valve ball, the gas sealing effect from the air inlet end to the air outlet end will be better.

[0012] Preferably, as an improvement, the fixing portion of the sealing shell and the first sealing ring is located outside the through hole of the first sealing ring; the fixing portion of the sealing shell and the second sealing ring is also located outside the through hole of the second sealing ring.

[0013] Thus, the sealing shell will not be located within the through hole of the first sealing ring, nor will the sealing shell be located within the through hole of the second sealing ring, and the sealing shell will not affect the passage of gas through the through hole of the first sealing ring and the through hole of the second sealing ring.

[0014] Preferably, as an improvement, the first sealing ring and the second sealing ring are both provided with an annular fixing groove or fixing hole, and the end of the sealing shell is fixed in the fixing groove or fixing hole; the fixing groove or fixing hole on the first sealing ring divides the first sealing ring into an outer ring and an inner ring, and the fixing groove or fixing hole on the second sealing ring also divides the second sealing ring into an outer ring and an inner ring.

[0015] Therefore, by providing the fixing hole or the fixing groove, the ends of the sealing shell are respectively fixed on the first sealing ring and the second sealing ring more firmly and stably.

[0016] Preferably, as an improvement, there is a fixed hole between the outer ring and the inner ring of the first sealing ring; the outer layer end and the inner wall of the outer ring are fixed, the inner layer end and the outer wall of the inner ring are fixed, and there is an air inlet between the inner layer end and the outer layer end, and the air inlet is a ring-shaped opening.

[0017] Preferably, as an improvement, the first sealing ring is provided with a fixing groove facing the valve ball, the outer layer end is fixed to one inner wall of the fixing groove, and the inner layer end is fixed to the other inner wall of the fixing groove; the air inlet part is a plurality of air inlet holes provided on the inner wall of the through hole of the first sealing ring, and the plurality of air inlet holes are all connected to the fixing groove.

[0018] Therefore, the structure of the first sealing ring in the present scheme is selected. When the valve ball blocks the through hole of the first sealing ring, the gas will no longer enter the channel of the valve ball. The gas flowing toward the valve ball will change its flow direction after colliding with the valve ball, and will preferentially flow in the radial direction of the through hole of the first sealing ring. This is because the flow resistance in the radial direction of the through hole is smaller than the reverse flow resistance of the gas. The air inlet is arranged on the inner wall of the through hole of the first sealing ring, which makes it easier for the gas to enter the air cavity between the outer layer and the inner layer of the sealing shell.

[0019] Preferably, as an improvement, a rod hole is provided at the top of the sealing shell, the sealing shell surrounds a valve ball space for accommodating the valve ball, and the rod hole and the valve ball space are connected. The valve ball space is used to accommodate the valve ball. The rod hole is used to allow the valve stem on the valve ball to pass through.

[0020] Preferably, as an improvement, the valve body includes a left valve body and a right valve body, and the left valve body and the right valve body are detachably connected. Thus, the detachable structure of the valve body facilitates the assembly of the valve ball, the first sealing ring, the second sealing ring, the sealing shell and other structures inside the electric valve.

[0021] Preferably, as an improvement, the bottom of the left valve body and the right valve body are both provided with a limiting part, and the two limiting parts are both annular, and the two limiting parts extend to the inner ring of the first sealing ring and the inner ring of the second sealing ring respectively. The limiting part is used to limit the first sealing ring and the second sealing ring, so that the first sealing ring and the second sealing ring are stably located in the valve body. At the same time, the limiting part extends to the inner ring, and the limiting part can support and limit the weak part between the inner ring and the outer ring, so as to avoid deformation of the first sealing ring and the second sealing ring at the weak part between the inner ring and the outer ring, and ensure the sealing effect of the first sealing ring and the second sealing ring on the valve ball.

[0022] Preferably, as an improvement, the valve body is provided with pressure sensors located on both sides of the valve ball, and the side wall of the valve body is provided with a receiving space for receiving the pressure sensor, and the pressure sensor is placed in the receiving space. The two pressure sensors are used to detect the pressure at the air inlet and air outlet of the electric valve. The receiving space accommodates the pressure sensor, and the pressure sensor will not be located in the gas channel of the electric valve and impacted by the gas flow, which is conducive to improving the accuracy of the pressure sensor in pressure detection and avoiding the pressure sensor being impacted by the gas flow and affecting its pressure detection accuracy.

[0023] Preferably, as an improvement, the sealing shell is made of rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of an electric valve for a gas defense system in Example 1.

[0025] Figure 2 for Figure 1 Left view of the first sealing ring.

[0026] Figure 3 for Figure 1 Left side cross-sectional view of the middle sealing shell.

[0027] Figure 4 This is a schematic diagram of the structure of an electric valve for a gas defense system in Example 2.

[0028] Figure 5 for Figure 4 Enlarged view of B.

[0029] Figure 6 for Figure 1 A is an enlarged view of the middle image. DETAILED DESCRIPTION

[0030] The following is further described in detail through specific implementation methods: The figure marks in the drawings of the specification include: left valve body 1, right valve body 2, flange 3, sealing cover 4, pressure sensor 5, driven gear 6, valve stem 7, driving gear 8, motor 9, limit part 10, outer ring 11, second sealing ring 12, valve ball 13, outer layer 14, inner layer 15, through hole 16, air cavity 17, sealing part 18, annular opening 19, inner ring 20, fixing groove 21, air inlet hole 22, valve ball space 23, stem hole 24, first sealing ring 25.

[0031] Example 1 Basically as attached Figure 1-Figure 3 , Figure 6 As shown: An electric valve for a gas defense system includes a valve body, a valve ball 13 rotatably arranged inside the valve body, and a first sealing ring 25 and a second sealing ring 12 both arranged inside the valve body. The valve body in this embodiment includes a left valve body 1 and a right valve body 2, and the left valve body 1 and the right valve body 2 are detachably connected. The specific detachable connection method can be connected by bolts. A sealing gasket is provided between the left valve body 1 and the right valve body 2, which can improve the connection sealing of the left valve body 1 and the right valve body 2. In this embodiment, the valve body is divided into a left valve body 1 and a right valve body 2 that can be connected and assembled, so that the valve ball 13, the first sealing ring 25, the second sealing ring 12 and other structures are conveniently arranged inside the valve body. The left and right ends of the valve body are respectively integrally formed with a flange 3, a connecting seat or a connecting nozzle, so that the left end of the left valve body 1 is conveniently connected to the air inlet pipe, and the right end of the right valve body 2 is conveniently connected to the air outlet pipe.

[0032] In this embodiment, the inner walls of the left valve body 1 and the right valve body 2 are both provided with a limiting portion 10, which is an annular limiting protrusion, so that the first sealing ring 25 and the second sealing ring 12 are placed in the valve body, and the limiting portion 10 plays a role in limiting the first sealing ring 25 and the second sealing ring 12, and the valve ball 13 is located between the first sealing ring 25 and the second sealing ring 12. Figure 1 As shown, the first sealing ring 25 is located on the side of the valve ball 13 close to the air inlet end of the valve body (the left end of the left valve body 1), and the second sealing ring 12 is located on the side of the valve ball 13 close to the air outlet end of the valve body (the right end of the right valve body 2). The first sealing ring 25 and the second sealing ring 12 are both provided with a circular through hole 16, and the valve ball 13 is provided with a channel, which can be opposite to the through hole 16, and the diameter of the channel is smaller than the diameter of the through hole 16. Similar to the prior art, the side wall of the through hole 16 of the first sealing ring 25 and the valve ball 13, and the side wall of the through hole 16 of the second sealing ring 12 and the valve ball 13 are attached to form a sealing portion 18, thereby sealing.

[0033] The electric valve in this embodiment also includes a sealing shell, which is flexible and made of rubber. The sealing shell is filled between the valve body and the valve ball 13. The sealing shell provides 360 degrees (360 degrees is 360 degrees of the gas flow direction angle of view, that is, Figure 1 360 degrees of coverage of left or right view. Figure 3 As shown, the sealing shell surrounds and forms a valve ball space 23, and the valve ball 13 is located in the valve ball space 23. A rod hole 24 is provided on the top of the sealing shell, and a valve stem 7 is connected to the top of the valve ball 13. The valve stem 7 passes through the rod hole 24, and the valve stem 7 extends to the outside of the valve body. The left end of the sealing shell is fixed on the first sealing ring 25, and the right end of the sealing shell is fixed on the second sealing ring 12. The specific fixing method is that the first sealing ring 25 and the second sealing ring 12 are both provided with fixing holes or fixing grooves (the fixing holes are connected to the left and right, and the fixing grooves are not connected to the left and right), and the fixing holes or fixing grooves 21 are both annular. The fixing holes or fixing grooves 21 divide the first sealing ring 25 into an outer ring 11 and an inner ring 20, and the fixing holes or fixing grooves 21 divide the second sealing ring 12 into an inner ring 20 and an outer ring 11. The end of the sealing shell is fixed in the fixing hole or fixing groove 21. In this embodiment, a fixing groove 21 is provided on the left end face of the second sealing ring 12, and the fixing groove 21 is located on the outside of the through hole 16 of the second sealing ring 12. The right end of the sealing shell is fixed (for example, bonded, or a clamping hole is provided on the inner wall of the fixing groove, and a clamping block is integrally provided at the right end of the sealing shell, and the clamping block is clamped in the clamping groove) in the fixing groove 21; a fixing hole is provided on the first sealing ring 25, and the fixing hole is located on the outside of the through hole 16 of the first sealing ring 25. The left end of the sealing shell is fixed (for example, bonded, or a clamping hole is provided on the inner wall of the fixing hole, and a clamping block is integrally provided at the right end of the sealing shell, and the clamping block is clamped in the clamping hole) and is located in the fixing hole.

[0034] The wall of the sealing shell in this embodiment includes an inner layer 15 and an outer layer 14, both of which are flexible, and an air cavity 17 is provided between the inner layer 15 and the outer layer 14. The right ends of the inner layer 15 and the outer layer 14 are connected as a whole, thereby achieving the blocking of the right end of the air cavity 17. The inner layer 15 and the outer layer 14 are connected as a whole and fixed in the annular fixing groove 21 of the second sealing ring 12. The first sealing ring 25 is provided with an air inlet portion connected with the air cavity 17. In this embodiment, the air inlet portion is specifically as follows: the left end of the outer layer 14 is fixed to the inner side wall of the fixing hole by bonding or clamping, the left end of the inner layer 15 is fixed to the inner wall of the other side of the fixing hole by bonding or clamping, the left end of the inner layer 15 and the left end of the outer layer 14 are not sealed, and the gap between the left end of the inner layer 15 and the left end of the outer layer 14 forms the air inlet portion. Since the fixing hole is annular, the air inlet portion is an annular opening 19. In this way, the gas in the valve body can enter the air cavity 17 between the inner layer 15 and the outer layer 14 from the annular opening 19 on the left side of the first sealing ring 25 .

[0035] The first sealing ring 25 and the second sealing ring 12 in this embodiment can be made of rubber, polytetrafluoroethylene or metal materials, etc. The thickness of the first sealing ring 25 and the second sealing ring 12 is 0.5-1 cm. In this embodiment, the gap distance between the inner layer 15 and the outer layer 14 is 0.5-1 mm.

[0036] Pressure sensors 5 are provided on both the left valve body 1 and the right valve body 2. The two pressure sensors 5 are pressure sensors 5 located on both sides of the valve ball 13. In order to reduce the impact of gas flow on the pressure sensor 5, a accommodating space for accommodating the pressure sensor 5 is provided on the side wall of the valve body in this embodiment. The accommodating space is connected to the flow channel of the valve body. The pressure sensor 5 is placed in the accommodating space. A sealing cover 4 for closing the accommodating space is provided on the valve body. A limit block for limiting the pressure sensor 5 is provided inside the accommodating space.

[0037] The valve body is provided with a driving component for driving the valve stem 7 to rotate. The driving component in this embodiment is exemplified by the following structure, but is not limited thereto: the driving component includes a motor 9, a driving gear 8 and a driven gear 6. The driving gear 8 and the output shaft of the motor 9 are coaxially fixed, the driven gear 6 and the valve stem 7 are coaxially fixed, and the driving gear 8 and the driven gear 6 are meshed, so that the motor 9 drives the driving gear 8 to rotate, and the driving gear 8 drives the driven gear 6 to rotate, thereby realizing the rotation of the valve stem 7, and the valve stem 7 drives the valve ball 13 to rotate, and realizes the closing and opening control of the electric valve. In this embodiment, the driving component is used to drive the valve stem 7 to rotate, and other structures that can drive the valve stem 7 to rotate can be used as the driving component.

[0038] The specific implementation process is as follows: In the present application, the first sealing ring 25 and the second sealing ring 12 are located on both sides of the valve ball 13, so that the valve ball 13 is sealed through the sealing part 18. When the electric valve is in the open state, Figure 1 As shown, the channel of the valve ball 13 is connected to the through hole 16 of the first sealing ring 25 and the through hole 16 of the second sealing ring 12. The gas enters from the left end of the electric valve and enters the channel of the valve ball 13 through the through hole 16 on the first sealing ring 25. The gas flows to the right into the through hole 16 of the second sealing ring 12 and continues to flow to the right, thereby flowing out from the outlet end. At this time, since the channel on the valve ball 13 is connected to the air inlet end and the air outlet end, the gas in the electric valve preferentially flows through the channel on the valve ball 13.

[0039] When the electric valve is closed, the valve stem 7 drives the valve ball 13 to rotate 90 degrees, and the channel on the valve ball 13 is no longer connected to the air inlet and air outlet of the electric valve, and the channel of the valve ball 13 is no longer connected to the through hole 16 of the first sealing ring 25 and the through hole 16 of the second sealing ring 12. When the gas entering the valve body from the air inlet flows to the right to the position of the valve ball 13, it is blocked by the valve ball 13, and the gas will not continue to flow to the right. At this time, the gas will be forced to flow to other spaces. Since the first sealing ring 25 is provided with an air inlet portion, the gas will enter the air cavity 17 between the inner layer 15 and the outer layer 14 of the sealing shell through the air inlet portion on the first sealing ring 25. Since the right end of the sealing shell is blocked, the gas will not leak from the right end of the sealing shell. In this way, the gas continues to enter the air cavity 17, and the air pressure in the air cavity 17 increases. The gas in the air cavity 17 exerts pressure on the inner layer 15 and the outer layer 14. The outer layer 14 is tightly attached to the valve under the action of the air pressure. On the inner wall of the valve body, the inner layer 15 is tightly wrapped around the valve ball 13 under the action of air pressure, so that the gap between the valve ball 13 and the valve body is fully filled with the sealing shell. When the electric valve is in a closed state, the electric valve seal not only seals the valve ball 13 at the sealing point 18 through the first sealing ring 25 and the second sealing ring 12, but also seals through the sealing shell. Compared with sealing only through the first sealing ring 25 and the second sealing ring 12, the valve ball 13 is covered with a large area, and the sealing effect is greatly improved. When detecting micro-leakage of gas between the gas outlet end of the electric valve and the gas equipment, the detection error will be reduced, thereby greatly improving the detection accuracy.

[0040] When the electric valve is opened, the valve ball 13 continues to rotate 90 degrees. At this time, the passage of the valve ball 13 is connected to the through hole 16 of the first sealing ring 25 and the through hole 16 of the second sealing ring 12. The gas will flow preferentially from the through hole 16 of the first sealing ring 25, the passage of the valve ball 13 and the through hole 16 of the second sealing ring 12. There will be no gas replenishment in the air cavity 17. At the same time, the gas in the air cavity 17 will also flow out from the air inlet. In this way, the air pressure between the inner layer 15 and the outer layer 14 is reduced, and the inner layer 15 will not be tightly attached to the valve ball 13. In the process of rotating the valve ball 13, the friction between the inner layer 15 and the valve ball 13 is small, which is conducive to improving the service life of the inner layer 15.

[0041] When a fixing hole is used on the first sealing ring 25, the inner ring 20 and the outer ring 11 are not connected. At this time, the inner ring 20 is fixed on the valve ball 13 only by the left end of the sealing shell. The pressure of the inner ring 20 on the valve ball 13 is relatively small, and the sealing effect of the seal 18 formed by the inner ring 20 and the valve ball 13 is not good. Therefore, in other embodiments, multiple connecting parts (such as connecting strips) can be integrally connected between the left side surface of the inner ring 20 and the left side surface of the outer ring 11 to realize the connection between the inner ring 20 and the outer ring 11. At the same time, there is a gap between adjacent connecting strips, which will not affect the entry of gas into the annular opening 19.

[0042] Example 2 When the fixing groove 21 or the fixing hole is provided on the first sealing ring 25, the part of the first sealing ring 25 where the fixing hole or the fixing groove 21 is provided (the connecting part between the inner ring 20 and the outer ring 11) is relatively weak, and the weak part of the first sealing ring 25 is easy to bend and deform. The pressure of the first sealing ring 25 on the sealing part 18 of the valve ball 13 will be relatively reduced compared with the first sealing ring without the fixing groove 21 or the fixing hole, thereby affecting the sealing effect of the first sealing ring 25 and the sealing part 18 of the valve ball 13. Similarly, the second sealing ring 12 will also have the same problem.

[0043] To this end, the two limiting portions 10 in this embodiment extend to the inner ring 20 of the first sealing ring 25 and the inner ring 20 of the second sealing ring 12 respectively, and the limiting portion 10 supports the inner ring 20 and the outer ring 11 at the same time, so that the inner ring 20 and the outer ring 11 can be supported by the limiting portion 10. Compared with only the outer ring 11 being supported, the sealing pressure of the inner ring 20 acting on the sealing part 18 of the valve ball 13 can be guaranteed, and the sealing effect of the sealing part 18 can be guaranteed. However, if the annular opening 19 structure of the first sealing ring 25 in Example 1 is still used at this time, the annular opening 19 will be blocked by the limiting portion 10, and the air intake of the sealing shell cannot be realized.

[0044] Combination Figure 4-Figure 5As shown, the difference between this embodiment and embodiment 1 is that the air inlet portion at the left end of the sealing shell is set differently. In this embodiment, the first sealing ring 25 does not use a fixing hole. A fixing groove 21 facing the valve ball 13 is provided on the right side of the first sealing ring 25 (the difference between the fixing groove 21 and the fixing hole is that the fixing groove 21 is not connected to the left and right, while the fixing hole is connected to the left and right). The fixing groove 21 is annular, and the diameter of the fixing groove 21 is larger than the diameter of the through hole 16 on the first sealing ring 25. The end of the outer layer 14 is fixed to one inner wall of the fixing groove 21 (for example, bonding or clamping), and the end of the inner layer 15 is fixed to the other inner wall of the fixing groove 21 (for example, bonding or clamping). The air inlet portion in this embodiment is a plurality of air inlet holes 22 provided on the inner wall of the through hole 16 of the first sealing ring 25, and the plurality of air inlet holes 22 are all connected to the fixing groove 21.

[0045] The structure of the first sealing ring 25 in the present scheme is selected. When the electric valve is closed, the valve ball 13 blocks the through hole 16 of the first sealing ring 25, and the gas flowing from left to right will no longer enter the channel of the valve ball 13. The gas flowing toward the valve ball 13 will change its flow direction after colliding with the valve ball 13. Since the gas flows from left to right, the gas blocked by the valve ball 13 has a greater resistance to reverse flow to the left, while the gas flowing to the right has a smaller flow resistance in the radial direction of the through hole 16 of the first sealing ring 25 after colliding with the valve ball 13. Therefore, the gas flowing to the right will preferentially flow in the radial direction of the through hole 16 of the first sealing ring 25 after colliding with the valve ball 13. The gas enters the fixed groove 21 through the air inlet 22 on the inner wall of the through hole 16 of the first sealing ring 25, and enters the air cavity 17 of the inner layer 15 and the outer layer 14. In this way, the gas no longer enters the sealed housing through the left side surface of the first sealing ring 25 , but enters the sealed housing through the inner wall of the through hole 16 of the first sealing ring 25 .

[0046] At the same time, by adopting the air intake method of this embodiment, the limiting portion 10 can extend to the through hole 16 of the first sealing ring 25, so as to provide better support for the first sealing ring 25, and avoid the first sealing ring 25 having a fixed groove 21 provided therein being relatively weak and easy to bend and deform. The left side of the entire first sealing ring 25 is counteracted and limited by the limiting portion 10, thereby ensuring the sealing effect of the first sealing ring 25 and the sealing point 18 of the valve ball 13.

[0047] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An electric valve for a gas defense system, comprising a valve body, a valve ball rotatably arranged inside the valve body, a first sealing ring and a second sealing ring both arranged inside the valve body, wherein the first sealing ring is located on a side of the valve ball close to an air inlet end of the valve body, and the second sealing ring is located on a side of the valve ball close to an air outlet end of the valve body, characterized in that: It also includes a sealing shell, which is filled between the valve body and the valve ball, and covers the valve ball. One end of the sealing shell is fixed on the first sealing ring, and the other end of the sealing shell is fixed on the second sealing ring. The wall of the sealing shell includes an inner layer and an outer layer, both of which are flexible, and an air cavity is provided between the inner layer and the outer layer. The first sealing ring is provided with an air inlet portion connected to the air cavity.

2. The electric valve for a gas defense system according to claim 1, characterized in that: The fixing part of the sealing shell and the first sealing ring is located outside the through hole of the first sealing ring; the fixing part of the sealing shell and the second sealing ring is also located outside the through hole of the second sealing ring.

3. The electric valve for a gas defense system according to claim 2, characterized in that: The first sealing ring and the second sealing ring are both provided with an annular fixing groove or fixing hole, and the end of the sealing shell is fixedly located in the fixing groove or fixing hole. The fixing groove or fixing hole on the first sealing ring divides the first sealing ring into an outer ring and an inner ring, and the fixing groove or fixing hole on the second sealing ring also divides the second sealing ring into an outer ring and an inner ring.

4. The electric valve for a gas defense system according to claim 3 is characterized in that: The fixing hole is between the outer ring and the inner ring of the first sealing ring; the outer layer end is fixed to the inner wall of the outer ring, the inner layer end is fixed to the outer wall of the inner ring, and the air inlet is between the inner layer end and the outer layer end, and the air inlet is a ring-shaped opening.

5. The electric valve for a gas defense system according to claim 3, characterized in that: The first sealing ring is provided with a fixing groove facing the valve ball, the outer layer end is fixed to one inner wall of the fixing groove, and the inner layer end is fixed to the other inner wall of the fixing groove; the air inlet part is a plurality of air inlet holes provided on the inner wall of the through hole of the first sealing ring, and the plurality of air inlet holes are all connected to the fixing groove.

6. The electric valve for a gas defense system according to claim 1, characterized in that: A rod hole is provided on the top of the sealing shell. The sealing shell surrounds a valve ball space for accommodating a valve ball. The rod hole is communicated with the valve ball space.

7. The electric valve for a gas defense system according to claim 1, characterized in that: The valve body comprises a left valve body and a right valve body, and the left valve body and the right valve body are detachably connected.

8. The electric valve for a gas defense system according to claim 5, characterized in that: The bottoms of the left valve body and the right valve body are both provided with limiting parts, both of which are annular and extend to the inner ring of the first sealing ring and the inner ring of the second sealing ring respectively.

9. The electric valve for a gas defense system according to claim 7, characterized in that: The valve body is provided with pressure sensors located on both sides of the valve ball, and the side wall of the valve body is provided with a receiving space for receiving the pressure sensor, and the pressure sensor is placed in the receiving space.

10. The electric valve for a gas defense system according to claim 1, characterized in that: The sealing shell is made of rubber.

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