Slowly-opening type electromagnetic valve of combustor

Abstract

The utility model provides a slow-open type electromagnetic valve of a combustor. The slow-open type electromagnetic valve comprises an electromagnetic coil, a fixed iron core, a movable iron core, a small valve group and a main valve group, wherein the electromagnetic coil is magnetized in two sections; the fixed iron core is arranged in the electromagnetic coil; when the first section of the movable iron core moves, the small valve group can be opened, the main valve group is opened at the second section after small flow of fuel gas is released, detonation caused by one-time instant release of the fuel gas can be prevented, and the slow opening function is achieved. After the small valve group is opened, except that static pressure applied to the main valve plug by gas can be relieved, a small spring of the small valve group counteracts a part of elastic force applied to the main valve plug by the main spring to seal the main valve port, so that the electromagnetic coil can be effectively helped to drive and maintain the opening of the second-section main valve group with smaller electric power, and the purpose of saving electricity is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a slow opening type electromagnetic valve applied to a burner, in particular to an electromagnetic valve capable of two-stage opening, which allows gas to flow through at a small flow rate in the first stage to avoid instantaneous deflagration of the gas and reduce the main spring force when the main valve plug is opened in the second stage, thereby helping the electromagnetic coil to open the main valve plug with less power. BACKGROUND

[0002] Conventional burners using gas as fuel, such as stoves or water heaters, mainly use high-voltage electricity to generate an electric arc or first ignite a mother fire, and then use an electromagnetic valve to open the main valve port to allow gas to flow through, and then use the electric arc or mother fire to ignite the main fire. When the main valve port is opened, the large amount of gas released at once will be ignited instantly, causing deflagration, which may pose a danger to the user.

[0003] To solve the problem of deflagration, the known technology CN213064630U provides a two-stage opening electromagnetic valve, which is structured to have a small valve plug and a small through hole provided in the center of the main valve plug, so that the first stage displacement of the movable core drives the small valve plug to open, and the second stage displacement of the movable core drives the main valve plug to open, in order to overcome the problem of deflagration.

[0004] However, the mechanism of the small valve plug and the main valve plug closing the small through hole and the main valve port in the known technology is to hold them upward on the same valve seat by a small spring and a main spring respectively. In this way, when the small valve plug is displaced upward by the first stage to compress the small spring and open, and the movable core is driven to be displaced by the second stage, not only the force of the main spring has to be overcome, but also the force of the continuously compressed small spring has to be overcome. Under the condition of continuously increasing the reaction force of the small spring and the reverse force of the main spring, the electromagnetic coil has to be driven to displace the movable core by the second stage with greater electric power, which not only wastes power, but also causes difficulty in opening the main valve plug.

[0005] In addition, in order to save power, the power control of such known electromagnetic valves generally provides a current of about 300 to 400 mA to drive the movable core and the main valve plug to open, and only about 5 mA of current is required after opening, which can generate sufficient magnetic attraction to keep the movable core in the open position. However, the known technology CN213064630U, after opening, due to the compression of the first stage small spring under long stroke, the reverse force increases, which hinders the design of maintaining normal opening with small current, forcing the electric control system to supply the electromagnetic coil with several times the current of 5 mA to maintain the open valve, which greatly increases the power consumption of the electromagnetic valve.

[0006] Therefore, the present inventor improves the slow opening structure of the electromagnetic valve, which not only meets the requirement of segmented opening, but also overcomes the problem of power consumption of the known technology CN213064630U. SUMMARY

[0007] The utility model discloses a kind of slow-opening electromagnetic valves of combustor, let gas first with first section small valve group open flow small flow gas, then open main valve group, avoid gas instantaneous deflagration.Small valve opens after except to remove the static pressure of main valve plug, small valve group compresses the elastic force of small spring and holds in main valve plug, can offset and reduce the valve spring force of main spring, help electromagnetic coil and movable core to open main valve plug with smaller power second section, achieve the effect of power saving.

[0008] To achieve the above object, the utility model provides a kind of slow-opening electromagnetic valves of combustor, the slow-opening electromagnetic valve includes: a two-section magnetic electromagnetic coil, a fixed core arranged in the electromagnetic coil, a movable core capable of receiving the magnetic attraction of the fixed core and two-section displacement, a main valve group, a small valve group and a fixed valve seat;Wherein the electromagnetic coil and fixed core are arranged above the valve seat, the main valve group, small valve group is below the valve seat, wherein:

[0009] The main valve group includes a main valve plug and a main spring, the top center of the main valve plug is provided with a concave active space, and a valve plug cover for shielding the active space is fixed around, wherein the bottom of the active space is provided with a small valve hole, the central part of the valve plug cover is provided with a socket, and at least one through hole is provided around to communicate the active space and the small valve hole, and the main spring is arranged between the valve plug cover and the valve seat, so that the bottom of the main valve plug can be abutted to close a main valve port by receiving the elastic force of the main spring, and the small valve hole is communicated with the main valve port;

[0010] The small valve group includes a pressing portion that is synchronously displaced at the bottom of the movable core, and the movable core is movably arranged in the socket of the valve plug cover, so that the pressing portion can be displaced up and down in the active space, and a small spring is arranged on the top of the pressing portion to abut against the bottom surface of the valve plug cover, so that the pressing portion can abut to close the small valve hole by receiving the elastic force of the small spring.

[0011] The first section of the electromagnetic coil is magnetized, so that the movable core and the pressing portion are displaced away from the small valve hole and compress the small spring, so that gas can be released to the main valve port in small flow through the through hole of the valve plug cover and the small valve hole to remove the static pressure of the main valve plug, and the second section of the electromagnetic coil is magnetized to drive the movable core and the pressing portion to be displaced, and the small spring is elastically abutted against the valve plug cover after the first section displacement, so as to offset and reduce the elastic force of the main spring acting on the main valve plug to close the main valve port, and help the main valve plug to be displaced upward to open the main valve port.

[0012] By the above structure, the utility model discloses a two-stage small valve group and main valve group design, when the first stage small valve group is opened, small flow gas can be circulated and combusted, and then the main valve group is opened to make large flow gas combust, thereby the slow opening function can be achieved, and the instantaneous deflagration caused by the large amount of gas released at one time can be prevented.Further, after the small valve group is opened to make small flow gas circulate, in addition to the static pressure of the gas applied to the main valve plug being removed, the first stage small valve group is opened to make the small spring elastically held on the valve plug cover of the main valve plug, the elastic force of the main spring acting on the main valve plug can be reduced and offset, the electromagnetic coil can be effectively helped to drive the movable iron core to open the second stage main valve group with small power, and the power saving effect can be achieved.

[0013] The embodiments of each component are further described below:

[0014] In implementation, the pressing part is integrally extended from the bottom end of the movable iron core, and a stop sheet is arranged on the periphery of the pressing part, and the small spring is arranged between the stop sheet and the valve plug cover.

[0015] In implementation, the pressing part is composed of a small valve plug arranged at the bottom of the movable iron core, and the small spring is abutted between the small valve plug and the valve plug cover.

[0016] In implementation, a flow limiting piece is arranged on the valve plug cover or the small valve hole, and the flow limiting piece can limit the flow of gas passing through the through hole, the small valve hole and the main valve port.

[0017] In implementation, the flow limiting piece is in the form of a sheet and is deflected and stacked on the top surface or the bottom surface of the valve plug cover, and the flow limiting piece is provided with a through hole relative to the through hole of the valve plug cover, so that the flow limiting piece can partially shield the through hole after being deflected, thereby adjusting and limiting the flow of gas passing through the through hole, the through hole and the small valve hole.

[0018] In implementation, the flow limiting piece is replaceably fixed around the small valve hole and is provided with at least one flow limiting hole, so that the gas can be released to the main valve port after passing through the through hole of the valve plug cover and the flow limiting hole, and the flow of gas is limited by the number or aperture size of the flow limiting hole.

[0019] Compared with the known technology CN213064630U, when the second stage main valve plug is opened, the elastic force of the large and small springs must be overcome, and a large amount of electric power must be provided to maintain the open valve state, and in the utility model, when the first stage small valve group is opened, the small spring in the small valve group is held upward on the valve plug cover of the large valve group, so that the elastic force of the main spring acting on the main valve plug to close the main valve port can be offset and reduced, the main valve plug is helped to displace upward to open the main valve port, the electromagnetic coil only needs a small amount of power to drive the movable iron core and the main valve plug to open, and the open valve state can be maintained, and the power saving advantage is achieved.

[0020] In addition, the flow limiting piece is designed, and the flow limiting piece can cooperate with different sources and pressures of liquid gas or natural gas to adjust and limit the flow of the first section, and the problem of explosion and combustion is solved completely.

[0021] According to the technical means of the utility model, the embodiments suitable for the utility model are listed, and the following description is combined with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the exploded view of the utility model.

[0023] Figure 2 It is the structure sectional view of the utility model in the static state.

[0024] Figure 3 It is the schematic diagram of the first section opening small valve group of the utility model.

[0025] Figure 4 It is the schematic diagram of the second section opening main valve group of the utility model.

[0026] Figure 5 It is the embodiment diagram of the flow limiting piece in the utility model.

[0027] Figure 6 It is the exploded view of the second embodiment of the utility model.

[0028] Figure 7 It is the structure sectional view of the second embodiment of the utility model in the static state.

[0029] Figure 8 It is the schematic diagram of the first section opening small valve group of the second embodiment of the utility model.

[0030] Figure 9 It is the schematic diagram of the second section opening main valve group of the second embodiment of the utility model.

[0031] Figure 10 It is the second embodiment diagram of the flow limiting piece in the utility model.

[0032] Figure 11 It is the second embodiment diagram of the main valve plug and small valve hole in the utility model.

[0033] BRIEF DESCRIPTION OF DRAWINGS: 10 - electromagnetic coil, 20 - fixed iron core, 30 - movable iron core, 40 - main valve plug, 41 - main spring, 42 - movable space, 43 - valve plug cover, 44 - small valve hole, 45 - sleeve interface, 46 - through hole, 50 - pressing part, 51 - small spring, 52 - stop piece, 53 - small valve plug, 54 - recess, 60 - valve seat, 70 - main valve port, 80 - flow limiting piece, 81 - perforation, 82 - flow limiting hole. DETAILED DESCRIPTION

[0034] like Figures 1 to 4 As shown, this utility model provides a slow-opening solenoid valve for a burner. The slow-opening solenoid valve includes: a two-stage magnetic electromagnetic coil 10, a fixed iron core 20 disposed within the electromagnetic coil 10, a movable iron core 30 capable of being magnetically attracted by the fixed iron core 20 and undergoing two-stage displacement, a main valve assembly, and a small valve assembly. In the figure, the main valve assembly includes a main valve plug 40, and the small valve assembly includes a pressing part 50 integrally extending from the bottom end of the movable iron core 30.

[0035] The electromagnetic coil 10 is positioned above a valve seat 60 for a fixed solenoid valve. The fixed iron core 20 is positioned inside the electromagnetic coil 10, and the movable iron core 30 is positioned below the fixed iron core 20. A magnetic attraction gap is maintained between the two. When the electromagnetic coil 10 is energized in two stages, the movable iron core 30 can be driven to move toward the fixed iron core 20 in two stages through the magnetic field of the fixed iron core 20.

[0036] The main valve plug 40 of the main valve group and the pressing part 50 of the small valve group are respectively connected to the movable iron core 30 in sections and are located below the valve seat 60. A main spring 41 is provided between the valve seat 60 and the main valve plug 40. The main spring 41 elastically presses downward against the top of the main valve plug 40, so that the bottom of the main valve plug 40 presses against and closes a main valve port 70.

[0037] The main valve plug 40 has a recessed movable space 42 at the top center, and a valve plug cover 43 is fixed around the periphery to cover the movable space 42. The bottom of the movable space 42 has a small valve hole 44 that connects to the main valve port 70. The top surface of the valve plug cover 43 can be elastically pushed downward by the main spring 41. A set of interface 45 is provided in the center for the movable iron core 30 to move up and down. At least one through hole 46 is provided around the periphery to connect the movable space 42 and the small valve hole 44.

[0038] The pressure part 50 of the small valve assembly extends integrally from the bottom of the movable iron core 30, and the bottom of the movable iron core 30 passes through the sleeve interface 45 of the valve plug cover 43, so that the pressure part 50 is located within the movable space 42 of the main valve plug 40 and can move up and down within the movable space 42. In addition, a small spring 51 is provided on the top of the pressure part 50, which presses upward against the bottom surface of the valve plug cover 43, so that the pressure part 50 and the movable iron core 30 can be subjected to the elastic force of the small spring 51 and press downward against the closed small valve hole 44.

[0039] Figures 1 to 5 In the disclosed small valve assembly, a stop plate 52 is provided around the periphery of the pressing part 50 integrally extended from the bottom of the movable iron core 30. A small spring 51 is positioned above the stop plate 52 and between it and the valve plug cover 43. In implementation, the pressing part 50 can also be configured as follows... Figures 6 to 10 As shown, it consists of a small valve plug 53, and a small spring 51 is disposed above the small valve plug 53 and between the bottom surface of the valve plug cover 43.

[0040] As Figure 3 shown, by the above configuration, when the first section of the electromagnetic coil 10 is energized, the fixed core 20 is magnetically attracted to drive the first section of the movable core 30 to displace, the pressing portion 50 is driven by the movable core 30 to move away from the small valve hole 44, so that the gas can pass through the through hole 46 of the valve plug cover 43 into the active space 42, and then pass through the small valve hole 44 to the main valve port 70, realizing the function of opening the small valve group in the first section to release small flow gas, thereby preventing deflagration.

[0041] As Figure 4 shown, when the second section of the electromagnetic coil 10 is energized, the fixed core 20 is magnetically attracted to drive the second section of the movable core 30 to displace, the stop piece 52 in the small valve group and the compressed small spring 51 are displaced upward to abut against the valve plug cover 43, which can further drive the main valve plug 40 to displace upward to move away from the main valve port 70, so that the gas is released from the second section opened main valve port 70 in addition to the first section opened small valve hole 44.

[0042] In the above process, when the first section of the small valve group is opened, the small valve hole 44 is released by the pressing portion 50 of the small valve group to release small flow gas, and the burner burns small flow gas first, which does not cause deflagration phenomenon, so when the second section of the main valve group is opened, the main valve plug 40 and the main valve port 70 of the main valve group are supplied with gas, which can achieve the effect of two-stage slow opening, effectively overcoming the problem of known technology that a large amount of gas is released at once and deflagrates instantly.

[0043] It should be particularly noted that after the first section of the small valve group is opened, in addition to opening the small valve hole 44, the stop piece 52 is displaced upward to compress the small spring 51, so that the small spring 51 generates upward elastic force to abut against the valve plug cover 43, thereby offsetting and reducing the part of the elastic force of the main spring 41 abutting against the valve plug cover 43 downward, so when the second section of the electromagnetic coil 10 is energized, only a small amount of power is required to drive the movable core 30 and the main valve plug 40 to displace in the second section to open the valve and maintain the open state, overcoming the problem of known technology that the second section must overcome the added elastic force of the two springs and require a large current to maintain the open state, achieving the effect of saving electricity.

[0044] In addition, when the burner is in an unused state without gas flow, the main valve plug 40 located at the position of the closed main valve port 70 will bear a large static pressure due to the pressure difference between the gas inlet and outlet, and the static pressure is directly related to the diameter of the gas flow, the larger the diameter, the greater the pressure. In other words, without reducing the static pressure, the electric control system must provide a larger power to the electromagnetic coil 10 to drive the main valve plug 40 to open the valve.

[0045] And the first paragraph of the invention through the small valve group open small valve hole 44, because the small valve hole 44 caliber is much smaller than the main valve port 70, so the electromagnetic coil 10 only need a little power to open the first paragraph, and open the small flow through can remove the gas to the main valve group main valve plug 40 static pressure, so that the electromagnetic coil 10 can be driven by a smaller power activity iron core 30 second paragraph open main valve plug 40 and main valve port 70, plus the aforementioned one paragraph open small valve group when the small spring 51 offset the main spring 1 of the partial elastic force, thus can effectively achieve the effect of saving electricity.

[0046] Furthermore, through research, the inventor found that the different pressure of liquefied gas or natural gas is one of the reasons for the gas explosion, so when the invention is implemented, as shown in Figures 1 to 5 , a flow limiting member 80 can be placed on the valve plug cover 43 or the small valve hole 44. The flow limiting member 80 can limit the flow of gas through the through hole 46 of the valve plug cover 43, the small valve hole 44 to the main valve port 70, so as to adjust the first paragraph of the small flow according to the different sources and pressure of the gas, and completely solve the problem of explosion.

[0047] As shown in Figures 1 to 5 , the flow limiting member 80 is a sheet-shaped deflection that is stacked on the top surface or bottom surface of the valve plug cover 43, and the flow limiting member 80 is provided with a perforation 81 relative to the through hole 46 of the valve plug cover 43, so that the flow limiting member 80 can partially shield the through hole 46 after deflection, thereby adjusting and limiting the flow of gas through the through hole 46, the perforation 81 to the small valve hole 44.

[0048] Figures 6 to 10 The second embodiment of the flow limiting member 80 is disclosed in the invention, wherein the electromagnetic coil 10, the fixed iron core 20, the movable iron core 30, the main valve plug 40 of the main valve group, etc. are the same as the embodiment of Figures 1 to 5 , which will not be described again. The difference between this embodiment and the previous embodiment is that the flow limiting member 80 is a plug-shaped or sheet-shaped replaceable fixed around the small valve hole 44, and is provided with at least one flow limiting hole 82 for gas flow, and the pressing part 50 of the small valve group is pressed against the flow limiting member 80 or the periphery of the small valve hole 44 through a small valve plug 53, so as to close the flow limiting hole 82 or the small valve hole 44. The small spring 51 is abutted between the stop piece 52 above the small valve plug 53 and the valve plug cover 43, providing the elastic force of the small valve plug 53 to press and close the flow limiting member 80.

[0049] When the small valve plug 53 is displaced upward with the first paragraph of the movable iron core 30, the gas can enter from the through hole 46 of the valve plug cover 43, and then be released to the main valve port 70 through the flow limiting hole 82 of the flow limiting member 80. When implemented, the flow limiting member 80 can be replaced according to the pressure of different gas sources such as liquefied gas or natural gas, and the number or aperture size of the flow limiting hole 82 on the flow limiting member 80 is used to limit and adjust the flow of the first paragraph of the small flow gas.

[0050] Similarly, after the first stage opens the small valve group, the small valve group is opened in addition to the small valve hole 44, the stop piece 52 is displaced upward to compress the small spring 51, so that the small spring 51 generates upward elastic force to abut against the valve plug cover 43, so that a part of the downward elastic force of the main spring 41 abutting against the valve plug cover 43 can be offset and reduced. Therefore, when the electromagnetic coil 10 is secondarily magnetized, only a small amount of power needs to be provided to drive the movable iron core 30 and the main valve plug 40 to be secondarily displaced to open the valve and maintain the open valve state, overcoming the problem that the prior art needs to overcome the added elastic force of two springs when the second stage is opened, achieving the effect of power saving.

[0051] Figure 11 The second embodiment of the main valve plug and the small valve hole in the utility model is shown in the figure. The main valve plug 40 can be provided with a recess 54 around the small valve hole 44. The recess 54 reduces the thickness of the main valve plug 40 around the small valve hole 44 and increases the flexibility. When the pressing portion 50 is elastically pressed against the small valve hole 44 to close the small valve group, a better deformation amount and elasticity can be provided to prevent a gap between the pressing portion 50 and the small valve hole 44.

[0052] In addition, the flow limiting member 80 is fixed around the small valve hole 44 in the above-mentioned embodiment. The flow limiting member 80 in the figure is fixed in the recess 51 in a sheet shape. The gas passing through the small valve hole 44 can be matched with liquefied gas or natural gas by the number or size of the flow limiting holes 82 on the flow limiting member 80, so as to limit and adjust the flow of the small flow gas in the first stage.

[0053] The above-mentioned embodiments and the accompanying drawings only illustrate the preferred embodiments of the utility model, and do not limit the scope of the utility model. For example, any similar or identical purpose, structure, device, feature, etc. should belong to the patent range of the utility model.

Claims

1. A slow opening electromagnetic valve for a burner, comprising: a two-stage magnetization electromagnetic coil, a fixed core disposed in the electromagnetic coil, a movable core capable of being attracted by the fixed core to move in two stages, a main valve group, a small valve group, and a fixed valve seat; wherein the electromagnetic coil and the fixed core are disposed above the valve seat, and the main valve group and the small valve group are disposed below the valve seat, characterized in that: the main valve group comprises a main valve plug and a main spring, the top of the main valve plug is centrally concave, and the periphery of the main valve plug is fixed with a valve plug cover that covers the concave space, wherein the bottom of the concave space is provided with a small valve hole, the central part of the valve plug cover is provided with a sleeve interface, and the periphery of the valve plug cover is provided with at least one through hole that connects the concave space and the small valve hole, and the main spring is disposed between the valve plug cover and the valve seat, so that the bottom of the main valve plug can be attracted by the elastic force of the main spring to close a main valve port, and the small valve hole is connected to the main valve port; the small valve group comprises a pressing part that is synchronously displaced at the bottom of the movable core, the movable core is movably disposed in the sleeve interface of the valve plug cover, so that the pressing part can move up and down in the concave space, and the top of the pressing part is provided with a small spring that is upwardly pressed against the bottom surface of the valve plug cover, so that the pressing part can be attracted by the elastic force of the small spring to close the small valve hole; and the first stage of magnetization of the electromagnetic coil causes the movable core and the pressing part to move away from the small valve hole and compress the small spring, so that the gas can be released to the main valve port in a small flow through the through hole of the valve plug cover and the small valve hole to release the static pressure of the main valve plug, and the second stage of magnetization of the electromagnetic coil drives the movable core and the pressing part to move in the second stage, and the small spring is elastically pressed upwardly against the valve plug cover after the first stage of displacement, so as to offset and reduce the elastic force of the main spring acting on the main valve plug to close the main valve port, and help the main valve plug to move upwardly to open the main valve port. The pressing part is integrally extended from the bottom end of the movable core, and the periphery of the pressing part is provided with a stop piece, and the small spring is disposed between the stop piece and the valve plug cover. The pressing part is composed of a small valve plug disposed at the bottom of the movable core, and the small spring is pressed between the small valve plug and the valve plug cover. A flow limiting member is disposed on the valve plug cover or the small valve hole, and the flow limiting member can limit the flow of gas through the through hole, the small valve hole, and the main valve port. The flow limiting member is in the shape of a sheet and is deflectably stacked on the top surface or the bottom surface of the valve plug cover, and the flow limiting member is provided with a through hole relative to the through hole of the valve plug cover, so that the flow limiting member can partially cover the through hole after deflection, thereby adjusting and limiting the flow of gas through the through hole, the through hole, and the small valve hole.

2. The burner slow-opening solenoid valve according to claim 1, wherein The flow limiting member is replaceably fixed around the small valve hole and is provided with at least one flow limiting hole, so that the gas can be released to the main valve port through the through hole of the valve plug cover and the flow limiting hole, and the number or aperture size of the flow limiting hole can limit the flow of gas.

3. The burner slow opening solenoid valve as set forth in claim 1, wherein ​ 4. The burner slow-opening solenoid valve according to any one of claims 1 to 3, wherein ​ 5. The burner slow-opening solenoid valve as set forth in claim 4, wherein ​ 6. The burner slow open solenoid valve of claim 4 wherein, ​

Images