Gas electromagnetic valve with double valve plugs

Abstract

The utility model provides a double-valve-plug gas electromagnetic valve, which comprises an electromagnetic coil group, a fixed iron core, a first movable iron core, a second movable iron core, a main valve plug, an auxiliary valve plug and a valve port part, when the electromagnetic coil group is electrified, magnetic force can be generated to drive the first movable iron core and the second movable iron core to move towards the fixed iron core so as to open the main valve plug and the auxiliary valve plug respectively. Wherein the main valve plug and the auxiliary valve plug can doubly seal the valve port part in a slight deflection manner, and even if the main valve plug, the auxiliary valve plug and the valve port part are relatively deflected due to machining tolerance or other reasons, the valve can be doubly and tightly sealed to ensure that fuel gas does not leak; besides, a detection hole capable of detecting whether gas leaks or not is formed in the position, relative to the position between the main valve plug and the auxiliary valve plug, of the valve port part, so that whether the main valve plug and the auxiliary valve plug accurately seal the valve port part or not can be detected, and safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to a double valve plug gas solenoid valve, which mainly utilizes the double valve plug to slightly swing to double seal the valve, so as to ensure that the gas will not leak. In addition, the valve opening is provided with a detection hole for detecting whether there is gas leakage between the double valve plugs, so as to facilitate the detection of whether the double valve plugs accurately close the valve opening. Background Art

[0002] As is known to all, the solenoid valve used in gas equipment or pipelines is to open the valve port by generating magnetic force when an electromagnetic coil is energized to drive a movable iron core and valve plug to move, so that gas can flow through the valve port. When the electromagnetic coil is de-energized and no magnetic force is generated, the valve plug can be pressed by the elastic force of a spring to close the valve port, thereby blocking the flow of gas.

[0003] In the related known technologies, for example, CN114278736A and Taiwan Patent TWM609514 disclose a solenoid valve that uses a main valve plug and a secondary valve plug to seal the valve, so that when one of the valve plugs fails and cannot seal the valve, the other valve plug can still tightly seal the valve port. However, after long-term research, the designer of this case found that although the known dual-valve plug solenoid valve can improve safety compared to the single valve plug, due to various design problems, when the dual valve plug seals the valve, it is still impossible to completely prevent gas leakage, and there is also a risk of not being able to operate normally when the valve is opened.

[0004] Taking CN114278736A as an example, first, when the sealing surfaces of the main and auxiliary valve plugs 7 and 8 are pressed against the periphery of the valve port, they must be completely kept in a vertical state to avoid the gap between the periphery of the valve plug and the valve port and the inability to tightly seal the valve. However, in practice, the design of the solenoid valve mechanism inevitably requires that the electromagnetic assembly, the iron core, the main and auxiliary valve plugs are respectively arranged in different parts and then these parts are combined; in this way, when the sealing surface of the valve plug and the valve port cannot be accurately kept vertical due to processing tolerance or assembly problems of any valve stem, valve plug or pipe fitting of the guide valve stem, when the valve plug and the valve stem (iron core) are at a fixed angle, a gap will be generated between the valve plug and the valve port, causing gas leakage.

[0005] Secondly, the main valve plug 7 of the above-mentioned CN114278736A is driven to open the valve through the first movable iron core 4, and the auxiliary valve plug 8 is driven to open the valve through the second movable iron core 3. However, when closing the valve, after the auxiliary valve plug 8 and the second movable iron core 3 are pressed against the valve port, the position of the second movable iron core 3 is fixed and can no longer move toward the valve port; at this time, if the auxiliary valve plug 8 and the second movable iron core 3 are slightly longer due to the aforementioned processing or assembly tolerances, or if the auxiliary valve plug 8 is blocked by foreign matter at the valve port, so that the second movable iron core 3 cannot move to the closed valve port position, the second movable iron core 3 will block the displacement of the first movable iron core 4, so that the main valve plug 7 cannot be pressed tightly against the valve port.

[0006] If the above situation is to be avoided, a larger gap is designed between the second movable iron core 3 and the first movable iron core 4. Although it is possible to overcome the problem of the second movable iron core 3 blocking the first movable iron core 4, when the electromagnetic coil is energized to generate magnetic attraction to open the valve, the first movable iron core 4 will not be able to generate effective magnetic attraction to the second movable iron core 3 due to this gap, making the second movable iron core 3 and the auxiliary valve plug 8 unable to operate normally when opening the valve, rendering the entire electromagnetic valve ineffective.

[0007] Furthermore, although the purpose of the double valve plug design is to seal the valve when one valve plug cannot seal the valve port, the other valve plug can still seal the valve, but after assembly, there is no way to know whether the double valve plugs can seal the valve tightly. For example, in the above-mentioned known technology CN114278736A, technicians can only test whether there is a leak from the end gas outlet, and cannot test whether one of them can seal the valve tightly. In addition, the same is true for another known technology Taiwan Patent TWM609514 mentioned above. Technicians cannot detect whether one of them can actually seal the valve, and cannot guarantee the safety of the product.

[0008] In view of the major defects in the above-mentioned known technologies, such as the main and auxiliary valve plugs being deflected due to tolerance or assembly problems and unable to be tightly pressed against the valve port, or being unable to generate effective magnetic attraction to open the valve, the designer of this case has specially created a double valve plug gas solenoid valve based on his practical experience in related fields, which can effectively overcome the defects of the known technologies and improve safety. Utility Model Content

[0009] The utility model aims to provide a double-valve plug gas solenoid valve, in which the main and auxiliary valve plugs can respectively slightly swing to seal the valve in a double-closed valve port portion, and even if the valve plug and the valve port are relatively deflected due to processing tolerance or other reasons, the valve can still be double-tightly sealed to ensure that the gas will not leak out; in addition, the valve port portion is provided with a detection hole for detecting whether there is a gas leak at a position relative to the main and auxiliary valve plugs, so as to facilitate the detection of whether the main and auxiliary valve plugs accurately close the valve port to ensure safety.

[0010] In order to achieve the above-mentioned purpose, the utility model provides a double valve plug gas solenoid valve, which comprises an electromagnetic coil group, a fixed iron core, a first movable iron core, a second movable iron core, a main valve plug, a secondary valve plug, and a valve opening portion comprising at least one main valve hole; wherein the main valve plug and the secondary valve plug can respectively receive the elastic force of a main spring and a secondary spring to press against the valve opening portion to seal the valve, and when the electromagnetic coil group is energized, it can generate magnetic force to drive the first and second movable iron cores to move toward the fixed iron core, and respectively drive the main valve plug and the secondary valve plug to move away from the valve opening portion to open the valve; the characteristics are:

[0011] The first movable iron core is movably arranged below the fixed iron core, and a hollow sleeve is extended downward from the outer periphery of the bottom, and the bottom periphery of the hollow sleeve is bent inward to form an inner buckle ring; the main valve plug has a through hole in the center, and the inner buckle ring is buckled inwardly to the outer periphery of the through hole and close to the center position of the main valve plug, so that the outer periphery of the main valve plug is away from the inner buckle ring located at the center, so that it can be slightly deflected and swung with the through hole as the center, and then be pressed against the valve mouth to seal the valve;

[0012] The second movable iron core is movably arranged up and down in the hollow sleeve, and the bottom passes downward through the through hole of the main valve plug and is provided with a convex ring; a movable groove is provided in the center of the auxiliary valve plug for the convex ring to be embedded from top to bottom, and a stop part is provided on the upper edge of the movable groove to stop the top surface periphery of the convex ring, so that the auxiliary valve plug can be slightly deflected with the convex ring as the center and pressed downward by the elastic force of the auxiliary spring to press against the valve mouth to seal the valve, and there is a distance between the bottom of the movable groove and the bottom of the convex ring, so that when the auxiliary valve plug is pressed against the valve mouth to seal the valve, the second movable iron core and the convex ring have a displacement space to sink, so as to avoid the first movable iron core being blocked by the second movable iron core, which causes the main valve plug to be unable to press against the valve mouth to seal the valve.

[0013] By means of the above-mentioned structure, the main and auxiliary valve plugs of the utility model can be doubly closed in the valve mouth with a slight swing, respectively. Even if the main and auxiliary valve plugs are relatively skewed from the valve mouth due to processing and assembly tolerances or other reasons, they can still be doubly and tightly fitted around the outer periphery of the valve mouth to ensure that the gas will not leak out. In addition, the design of the movable groove enables the second movable iron core to have a displacement space for sinking when the auxiliary valve plug is pressed against the valve mouth to seal the valve. On the one hand, it will not block the first movable iron core and the main valve plug from moving toward the valve mouth to seal the valve. On the other hand, the first movable iron core can abut against the second movable iron core when it is displaced, so that no gap leakage occurs between the two. When the electromagnetic coil group is energized to open the valve, the first movable iron core can magnetically attract the second movable iron core and synchronously move toward the fixed iron core to open the valve.

[0014] The implementation of each element is further described below:

[0015] During implementation, a small spring is provided in the movable groove of the auxiliary valve plug. The small spring presses upward against the bottom of the convex ring of the second movable iron core, and can generate an upward elastic force on the second movable iron core, so that the top surface of the second movable iron core can press against the bottom surface of the first movable iron core to increase the magnetic attraction between each other.

[0016] During implementation, the main valve hole is set in the center of the valve mouth, the bottom surface of the auxiliary valve plug is pressed downward against the outer periphery of the main valve hole, and the outer periphery of the bottom of the main valve plug is pressed against the outer periphery of the auxiliary valve plug, so as to double-close the main valve hole of the valve mouth by the main valve plug and the auxiliary valve plug inside and outside.

[0017] During implementation, the valve mouth portion further includes a secondary valve hole located below the main valve hole, the main valve plug presses against and closes the main valve hole, and the secondary valve plug presses against and closes the secondary valve hole.

[0018] During implementation, the valve mouth is provided with a detection hole between the main valve plug and the auxiliary valve plug, and the detection hole is connected to a detection channel. Through the detection hole and the detection channel, it can be detected whether the main valve plug and the auxiliary valve plug are indeed sealed.

[0019] During implementation, a detection screw for closing the detection channel is provided at the outer end of the detection channel. When the detection screw is loosened, the detection hole and the detection channel can be connected to the outside for detection.

[0020] During implementation, a concave annular groove is provided at the top of the main valve plug relative to the outer periphery of the inner buckle ring to increase the flexibility of the main valve plug in slightly swinging.

[0021] During implementation, there is an active space between the lower part of the electromagnetic coil assembly and the valve opening, the top of the main spring is fixed to the top of the active space, and the bottom is pressed against the hollow sleeve or the main valve plug, so that the main spring can generate an elastic force to move the valve toward the valve opening to the first active iron core, the hollow sleeve and the main valve plug.

[0022] During implementation, the bottom surface of the main valve plug is provided with an upper recess around the through hole, the auxiliary valve plug is arranged below the upper recess relative to the main valve plug, and a pressure ring is provided on the bottom surface of the upper recess, the pressure ring extends upward to form a positioning ring surrounding the inner periphery of the through hole, the positioning ring and the inner buckle ring buckled inwardly on the outer periphery of the through hole form an internal and external clamping state to prevent the main valve plug from falling off from the bottom end of the hollow sleeve; and, a spring pad is provided corresponding to the top surface of the auxiliary valve plug, and the auxiliary spring is provided between the pressure ring and the spring pad.

[0023] During implementation, the top of the hollow sleeve of the first movable iron core is located inside the electromagnetic coil group, and the bottom extends downward so that the inner buckle ring is located below the electromagnetic coil group, and the outer diameter of the second movable iron core is larger than the inner diameter of the inner buckle ring, so that the second movable iron core is restricted to move within the length of the hollow sleeve and forms a membrane block together with the first movable iron core, preventing the second movable iron core from being separated and falling off from the first movable iron core and the hollow sleeve due to the elastic force of the auxiliary spring.

[0024] Compared with the prior art, the utility model can overcome the problem of relative deviation between the main and auxiliary valve plugs and the valve mouth due to processing and assembly tolerances or other reasons in the known technology by using the main and auxiliary valve plugs to swing slightly for double sealing. The design of the movable groove ensures that the second movable iron core will not block the displacement of the first movable iron core when the auxiliary valve plug is sealing the valve. In addition to ensuring that the main valve plug can seal the valve reliably, the magnetic attraction between the first and second movable iron cores can be ensured, thereby overcoming the problem that the main valve plug in the known technology cannot seal the valve reliably, or cannot magnetically drive the auxiliary valve plug to open the valve after sealing.

[0025] In addition, the detection hole can be used to detect whether the main and auxiliary valve plugs are accurately closing the valve port, overcoming the problem of the known technology that it is impossible to confirm whether the main and auxiliary valve plugs are normally sealing the valve after assembly, and can achieve the effect of ensuring the quality and safety of the solenoid valve.

[0026] Based on the technical means of the present invention, implementation methods suitable for the present invention are listed below and described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the utility model.

[0028] Figure 2 This is an enlarged view of the main and auxiliary valve plug structures of the utility model.

[0029] Figure 3 It is a side sectional view of the closed valve port of the utility model in a normal use state.

[0030] Figure 4 It is a structural schematic diagram of the main and auxiliary valve plugs of the utility model in the valve opening state.

[0031] Figure 5 It is a schematic diagram of a valve in which one of the main valve plug and the auxiliary valve plug of the utility model cannot be sealed.

[0032] Figure 6 It is a schematic diagram of the main valve and auxiliary valve plug sealing valve when the valve mouth parts of the utility model are relatively inclined.

[0033] Figure 7 It is a schematic diagram of another embodiment of the valve port part of the utility model.

[0034] Figure 8 This is a diagram showing an embodiment of the utility model applicable to a battery-type solenoid valve.

[0035] Explanation of the reference numerals: 100-electromagnetic coil assembly; 101-fixed iron core; 102-movable space; 103-terminal; 104-electrical connector; 10-first movable iron core; 11-hollow sleeve; 12-inner buckle ring; 20-second movable iron core; 21-convex ring; 30-main valve plug; 31-perforation; 32-concave ring groove; 33-upper recess; 34-pressing ring; 35-positioning ring; 40-auxiliary valve plug; 41-movable groove; 42-stopper; 43-small spring; 44-spring pad; 50-valve mouth; 51-main valve hole; 51a-auxiliary valve hole; 52-detection hole; 53-detection channel; 54-detection screw; 60-main spring; 70-auxiliary spring. DETAILED DESCRIPTION

[0036] like Figures 1 to 3 As shown, the utility model provides a double valve plug gas solenoid valve, comprising: an electromagnetic coil group 100, a fixed iron core 101 is arranged inside the electromagnetic coil group 100, and a first movable iron core 10, a second movable iron core 20, a main valve plug 30, a secondary valve plug 40, and a valve mouth portion 50 are arranged in sequence below the fixed iron core 101.

[0037] The first movable iron core 10 is assembled with the main valve plug 30, and the second movable iron core 20 is assembled with the auxiliary valve plug 40. The main valve plug 30 and the auxiliary valve plug 40 can respectively receive the elastic force of a main spring 60 and an auxiliary spring 70 to press against the valve opening 50 to seal the valve. Figure 4 As shown, when the electromagnetic coil assembly 100 is energized to generate magnetic force, it can drive the first movable iron core 10 and the second movable iron core 20 to move toward the fixed iron core 101, and respectively drive the main valve plug 30 and the auxiliary valve plug 40 away from the valve port 50 to open the valve.

[0038] Above Figure 4 In the disclosed valve opening state, when the electromagnetic coil assembly 100 is energized to generate magnetic force on the fixed iron core 101 to attract the first movable iron core 10, the first movable iron core 10 can generate magnetic conductivity on the second movable iron core 20, so that the first movable iron core 10 and the second movable iron core 20 can be magnetically attracted at the same time and move toward the fixed iron core 101 to open the valve; this principle is a known technology and will not be elaborated here.

[0039] in addition, Figure 1 , Figure 2 The valve opening 50 shown in FIG. 1 is provided with a main valve hole 51 for gas flow in the center, and the main valve plug 30 and the auxiliary valve plug 40 are respectively pressed against the periphery of the main valve hole 51 of the valve opening 50, forming a state in which the main valve hole 51 is double-closed inside and outside. Figure 5As shown, when the auxiliary valve plug 40 cannot close the main valve hole 51 due to obstruction by foreign matter, the main valve plug 30 can still be tightly attached to the periphery of the auxiliary valve plug 40, so that the main valve hole 51 of the valve mouth 50 remains closed; vice versa, if the main valve plug 30 fails, the auxiliary valve plug 40 can still close the main valve hole 51.

[0040] like Figures 1 to 3 As shown, based on the operating principle of the above-mentioned double valve plug solenoid valve, the first movable iron core 10 of the utility model is movably arranged up and down below the fixed iron core 101, and a hollow sleeve 11 extends downward from the outer periphery of the bottom of the first movable iron core 10, and the bottom of the hollow sleeve 11 is bent inward to form an inner buckle ring 12.

[0041] A through hole 31 is correspondingly provided in the center of the main valve plug 30, and the inner retaining ring 12 is retained inwardly on the periphery of the through hole 31 and close to the center position of the main valve plug 30, so that the periphery of the main valve plug 30 is relatively far away from the inner retaining ring 12 located at the center position; since the valve plug is made of rubber with a certain elasticity, the outer periphery of the main valve plug 30 can be pressed against the valve mouth 50 with a slight deviation around the through hole 31 to seal the valve.

[0042] The main valve plug 30 is designed to be capable of slight swinging because the components of the solenoid valve mechanism must inevitably be installed in combination. When any component fails to keep the sealing surface of the valve plug and the valve port precisely vertical due to machining tolerances or assembly problems, a gap will be created between the valve plug and the valve port, causing gas leakage.

[0043] Figure 6 The state of the main valve plug 30 and the valve mouth 50 when they are relatively tilted is revealed. Through the feature of the main valve plug 30 in the utility model that it can slightly swing around the through hole 31, even if the main valve plug 30 and the valve mouth 50 are relatively tilted, the main valve plug 30 can still be pressed down tightly against the valve mouth 50 to avoid the formation of a gap between the main valve plug 30 and the valve mouth 50.

[0044] In addition to the main valve plug 30, the auxiliary valve plug 40 in the present invention also has the feature of slight swing. Figure 1 , Figure 2 As shown, the second movable iron core 20 is movably disposed up and down in the hollow sleeve 11 , and the bottom of the second movable iron core 20 passes downward through the through hole 31 of the main valve plug 30 and is provided with a convex ring 21 .

[0045] The auxiliary valve plug 40 is provided with a movable groove 41 at the central position for the convex ring 21 to be inserted from top to bottom, and a stopper 42 is provided at the upper edge of the movable groove 41 to stop the top surface periphery of the convex ring 21. As mentioned above, the valve plug is made of elastic rubber, so that the auxiliary valve plug 40 can be slightly deflected around the convex ring 21 and pressed down by the elastic force of the auxiliary spring 70 to press against the valve opening 50 to seal the valve.

[0046] Figure 6 At the same time, the state when the auxiliary valve plug 40 and the valve mouth 50 are relatively tilted is disclosed. Similarly, when the auxiliary valve plug 40 and the valve mouth 50 are relatively tilted due to assembly tolerance, since the auxiliary valve plug 40 can slightly swing around the convex ring 21, the auxiliary valve plug 40 can still be pressed down tightly around the valve mouth 50 to avoid the formation of a gap.

[0047] It is particularly worth mentioning that Figure 2 In the structure shown, there is a distance between the bottom of the movable groove 41 of the auxiliary valve plug 40 and the bottom of the convex ring 21 of the second movable iron core 20. When the auxiliary valve plug 40 is pressed against the valve mouth 50 by the auxiliary spring 70 to seal the valve, there is a movable space between the bottom of the convex ring 21 and the bottom of the movable groove 41, so that the second movable iron core 20 can sink and move relative to the auxiliary valve plug 40.

[0048] The purpose of making the second movable iron core 20 have a downward displacement space in the valve closing state is as follows: Figure 2 and Figure 5 As shown, when the auxiliary valve plug 40 cannot be tightly pressed against the valve mouth 50 due to obstruction by foreign matter, if the second movable iron core 20 cannot sink and move relative to the auxiliary valve plug 40, the top of the second movable iron core 20 will block the downward movement of the first movable iron core 10, and at the same time, the main valve plug 30 cannot move downward to a position tightly pressed against the valve mouth 50, causing the main and auxiliary valve plugs 30 and 40 to fail.

[0049] That is, through the distance between the bottom of the movable groove 41 and the convex ring 21, a sinking displacement space can be formed for the second movable iron core 20. When the first movable iron core 10 moves downward and presses against the second movable iron core 20, the second movable iron core 20 can be pressed down at the same time to prevent the second movable iron core 20 from blocking the first movable iron core 10 from moving downward to seal the valve.

[0050] In addition, during implementation, a small spring 43 can be arranged in the movable groove 41 to press upward against the bottom of the convex ring 21. The small spring 43 can generate an upward elastic force on the second movable iron core 20, so that the top surface of the second movable iron core 20 can be close to the bottom surface of the first movable iron core 10, so that the magnetic attraction between the second movable iron core 20 and the first movable iron core 10 will not be weakened due to magnetic leakage between the gap, and the magnetic attraction between the second movable iron core 20 and the first movable iron core 10 can be increased relatively, so as to avoid the magnetic attraction of the first movable iron core 10 being insufficient to absorb the displacement of the second movable iron core 20 when opening the valve.

[0051] Other embodiments of the present invention are further described below:

[0052] like Figure 3 As shown, during implementation, the valve mouth portion 50 is provided with a detection hole 52 at a position between the main valve plug 30 and the auxiliary valve plug 40, and the detection hole 52 is connected to a detection channel 53, and an outer end of the detection channel 53 is provided with a detection screw 54 for closing the detection channel 53. After the detection screw 54 is loosened, the detection hole 52 and the detection channel 53 can be connected to the outside to detect whether the main valve plug 30 and the auxiliary valve plug 40 are sealed valves.

[0053] The purpose of designing the detection hole 52 is to overcome the problem that the known dual valve plug solenoid valve cannot be detected. The basic function of the dual valve plug solenoid valve is to use two valve plugs. When one valve plug fails, the other valve plug can still seal the valve; that is, unless the two valve plugs fail at the same time and cause leakage at the outlet, the currently known technology cannot know whether one of them fails. The detection hole 52 set between the main valve plug 30 and the auxiliary valve plug 40 of the utility model can overcome this problem and improve the quality and safety of the solenoid valve.

[0054] It should be noted that the above Figures 1 to 6 The valve port 50 shown in the figure has a main valve hole 51 for gas flow. The present invention can also be applied to Figure 7 The disclosed valve port portion 50 has two valve holes. Figure 7 As shown, in addition to the main valve hole 51, the valve mouth portion 50 is provided with an auxiliary valve hole 51a below the main valve hole 51. The main valve hole 51 and the auxiliary valve hole 51a are respectively connected to different gas channels. When one of them is closed, the gas can be blocked.

[0055] As shown in the figure, the utility model cooperates with the design of such double valve plugs, and only needs to make the main valve plug 30 press against the closed main valve hole 51, and the auxiliary valve plug 40 press against the closed auxiliary valve hole 51a, so that the main valve plug 30 and the auxiliary valve plug 40 can form a state of double-closing the valve opening 50. Similarly, when implementing, the detection hole 52 on the aforementioned valve opening 50 only needs to be set at a position relative to the main valve plug 30 and the auxiliary valve plug 40, so as to detect whether the main valve plug 30 and the auxiliary valve plug 40 are indeed sealing the valve.

[0056] like Figure 2 As shown, in order to increase the flexibility of the main valve plug 30 to swing left and right, a concave annular groove 32 is provided on the top of the main valve plug 30 relative to the outer periphery of the inner buckle ring 12 during implementation, so that the periphery of the main valve plug 30 has more elastic activity space.

[0057] In addition, the bottom surface of the main valve plug 30 is provided with an upper recess 33 around the through hole 31, and a pressure ring 34 is provided on the bottom surface of the upper recess 33 near the through hole 31. A positioning ring 35 is extended upward from the pressure ring 34 to surround the inner periphery of the through hole 31. Through the positioning ring 35 and the inner buckle ring 12 buckled inwardly on the outer periphery of the through hole 31, an internal and external clamping state can be formed to prevent the main valve plug 30 from falling off from the bottom end of the hollow sleeve 11.

[0058] exist Figure 2 In the illustrated embodiment, the upper recess 33 of the main valve plug 30 can be provided for the auxiliary valve plug 40 to be set, so that the main valve plug 30 and the auxiliary valve plug 40 form a state of an inner and outer closed valve mouth portion 50, and a spring pad 44 can be provided on the top surface of the auxiliary valve plug 40, so that the aforementioned auxiliary spring 70 can be set between the pressure ring 34 and the spring pad 44, so that the auxiliary spring 70 can generate an elastic force toward the valve mouth portion 50 on the auxiliary valve plug 40.

[0059] Figure 1 , Figure 2 In addition, the utility model has advantages in assembly. There is an active space 102 between the lower part of the electromagnetic coil assembly 100 and the valve opening 50. The top of the main spring 60 is fixed to the top of the active space 102, and the bottom is pressed against the hollow sleeve 11 or the main valve plug 30, so that the main spring 60 can generate an elastic force on the first active iron core 10, the hollow sleeve 11 and the main valve plug 30 to move the valve toward the valve opening 50 to seal the valve.

[0060] Among them, the top of the hollow sleeve 11 of the first movable iron core 10 is located in the inner periphery of the electromagnetic coil group 100, and the bottom extends downward so that the inner buckle ring 12 is located in the movable space 102, and the outer diameter of the second movable iron core 20 is larger than the inner diameter of the inner buckle ring 12, so that the second movable iron core 20 is restricted to move within the length range of the hollow sleeve 11.

[0061] In addition, the second movable iron core 20 is restricted by the hollow sleeve 11 so that the second movable iron core 20 and the first movable iron core 10 can form a membrane block together. During assembly, the second movable iron core 20 can be prevented from being separated from the first movable iron core 10 and the hollow sleeve 11 due to the elastic force of the auxiliary spring 70, thereby achieving the effect of convenient assembly.

[0062] The above drawings and descriptions are only used to illustrate the preferred implementation of the present invention, and are not intended to limit the scope of the present invention. Figures 1 to 6 It is disclosed that a terminal 103 is provided above the battery valve for connecting to an external power source, such as mains electricity; Figure 8 The invention discloses that an electric connector 104 that can be connected to a battery is disposed outside the solenoid valve, so that the utility model can also be applied to a solenoid valve that uses a battery as a power source. For example, the up, down, left, and right directions disclosed in all the drawings, when the solenoid valve is used in a horizontal position, the up and down directions form the left and right or front and rear directions. Therefore, any examples that are similar or identical to the purpose and structural features of the utility model should belong to the patent scope of the utility model.

Claims

1. A dual valve plug gas solenoid valve, the solenoid valve comprising a solenoid coil assembly, a fixed iron core, a first movable iron core, a second movable iron core, a main valve plug, a secondary valve plug, and a valve port portion comprising at least one main valve hole; wherein, The main valve plug and the auxiliary valve plug can be respectively pressed against the valve opening by the elastic force of a main spring and an auxiliary spring to seal the valve. When the electromagnetic coil assembly is energized, it can generate magnetic force to drive the first movable iron core and the second movable iron core to move toward the fixed iron core, and respectively drive the main valve plug and the auxiliary valve plug away from the valve opening to open the valve; the characteristics are: The first movable iron core is movably arranged below the fixed iron core, and a hollow sleeve is extended downward from the outer periphery of the bottom, and the bottom periphery of the hollow sleeve is bent inward to form an inner buckle ring; the main valve plug has a through hole in the center, and the inner buckle ring is buckled inwardly to the outer periphery of the through hole and close to the center position of the main valve plug, so that the outer periphery of the main valve plug is away from the inner buckle ring located at the center, so that the outer periphery of the main valve plug can be slightly deflected and swung with the through hole as the center, and then moved downward synchronously with the first movable iron core and the hollow sleeve, and then pressed against the valve opening to seal the valve; The second movable iron core is movably arranged up and down in the hollow sleeve, and the bottom passes downward through the through hole of the main valve plug and is provided with a convex ring; a movable groove is provided in the center of the auxiliary valve plug for the convex ring to be embedded from top to bottom, and a stop part is provided on the upper edge of the movable groove for stopping at the top surface periphery of the convex ring, so that the auxiliary valve plug can be slightly deflected with the convex ring as the center and pressed downward by the elastic force of the auxiliary spring to press against the valve mouth to seal the valve, and there is a distance between the bottom of the movable groove and the bottom of the convex ring, so that when the auxiliary valve plug is pressed against the valve mouth to seal the valve, the second movable iron core and the convex ring have a displacement space to sink, so as to avoid the first movable iron core being blocked by the second movable iron core, which causes the main valve plug to be unable to press against the valve mouth to seal the valve.

2. The double valve plug gas solenoid valve according to claim 1, characterized in that: A small spring is provided in the movable groove of the auxiliary valve plug. The small spring presses upward against the bottom of the convex ring of the second movable iron core, and can generate an upward elastic force on the second movable iron core, so that the top surface of the second movable iron core can press against the bottom surface of the first movable iron core to increase the magnetic attraction between them.

3. The double valve plug gas solenoid valve according to claim 2, characterized in that: The main valve hole is set in the center of the valve mouth, the bottom surface of the auxiliary valve plug is pressed downward against the outer periphery of the main valve hole, and the outer periphery of the bottom of the main valve plug is pressed against the outer periphery of the auxiliary valve plug, so as to double-close the main valve hole of the valve mouth by the main valve plug and the auxiliary valve plug inside and outside.

4. The double valve plug gas solenoid valve according to claim 2, characterized in that: The valve mouth also includes an auxiliary valve hole. The main valve plug presses against and closes the main valve hole, and the auxiliary valve plug presses against and closes the auxiliary valve hole.

5. The double valve plug gas solenoid valve according to claim 3 or 4, characterized in that: The valve mouth is provided with a detection hole at a position between the main valve plug and the auxiliary valve plug. The detection hole is connected to a detection channel. Through the detection hole and the detection channel, it is possible to detect whether the main valve plug and the auxiliary valve plug are sealing the valve.

6. The double valve plug gas solenoid valve according to claim 5, characterized in that: The outer end of the detection channel is provided with a detection screw for closing the detection channel. When the detection screw is loosened, the detection hole and the detection channel can be connected to the outside for detection.

7. The double valve plug gas solenoid valve according to claim 1, characterized in that: The top of the main valve plug is provided with a concave annular groove relative to the outer periphery of the inner buckle ring to increase the flexibility of the main valve plug in micro-swinging.

8. The double valve plug gas solenoid valve according to claim 1, characterized in that: There is a movable space between the bottom of the electromagnetic coil group and the valve mouth. The top of the main spring is fixed on the top of the movable space, and the bottom is against the hollow sleeve or the main valve plug, so that the main spring can generate an elastic force to move the valve toward the valve mouth to the first movable iron core, the hollow sleeve and the main valve plug.

9. The double valve plug gas solenoid valve according to claim 1, characterized in that: The bottom surface of the main valve plug is provided with an upper recess around the outer periphery of the through hole, the auxiliary valve plug is arranged below the upper recess relative to the main valve plug, and a pressure ring is provided on the bottom surface of the upper recess, the pressure ring extends upward to form a positioning ring surrounding the inner periphery of the through hole, the positioning ring and the inner buckle ring buckled inwardly on the outer periphery of the through hole form an internal and external clamping state to prevent the main valve plug from falling off from the bottom end of the hollow sleeve; and, a spring pad is provided corresponding to the top surface of the auxiliary valve plug, and the auxiliary spring is provided between the pressure ring and the spring pad.

10. The double valve plug gas solenoid valve according to claim 1, characterized in that: The top of the hollow sleeve of the first movable iron core is located inside the electromagnetic coil group, and the bottom extends downward so that the inner buckle ring is located below the electromagnetic coil group, and the outer diameter of the second movable iron core is larger than the inner diameter of the inner buckle ring, so that the second movable iron core is restricted to move within the length of the hollow sleeve and forms a membrane block together with the first movable iron core, preventing the second movable iron core from being separated and falling off from the first movable iron core and the hollow sleeve due to the elastic force of the auxiliary spring.

Images