Valve shaft assembling structure of household gas flameout protection device

Abstract

The invention provides a valve shaft assembly structure of a household gas flameout protection device, which reduces the friction between a valve shaft and an electromagnetic sheet and between the valve shaft and a plastic shell, further improves the failure of an electromagnetic valve caused by the falling of chippings, and ensures that the gas flameout device can work normally for a long time. According to the technical scheme, the electromagnetic valve comprises a valve shaft, a sealing gasket, a spring, a plastic shell, an electromagnetic sheet and an electromagnet. The valve is characterized in that the valve shaft is made of a macromolecule wear-resistant self-lubricating material, a plurality of locking positioning flaps which are arranged in an outward diffusion mode from top to bottom are arranged at the bottom of the valve shaft, and the locking positioning flaps are annularly distributed at intervals; a compression space is reserved in the center area of the bottom of the valve shaft corresponding to the center areas of the locking positioning flaps which are not directly connected, and a center hole of the electromagnetic sheet is installed and fixedly arranged along the locking positioning flaps from bottom to top in an upward moving mode. And a guide sleeve at the upper part of the plastic shell is sleeved on the outer ring surface of the corresponding height position of the valve shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas flameout protection device, in particular to a valve shaft assembly structure of a household gas flameout protection device. BACKGROUND

[0002] The electromagnetic valve in the gas stove flameout protection device can timely cut off the gas source after the stove accidentally goes out; the structure of the existing gas electromagnetic valve is shown in Figure 1 , wherein the details of the valve shaft assembly structure are shown in Figure 2 , which includes a copper shaft, a sealing gasket, a copper gasket, a spring, a plastic shell, an electromagnetic sheet and an electromagnet, and the working principle is as follows: when the stove is used, the valve rod is pushed, the copper shaft is pushed down, the spring is compressed, the electromagnetic sheet contacts the electromagnet and forms a loop; at this time, the stove battery supplies power to the ignition coil to generate a high-voltage arc to ignite the gas and heat the thermocouple; the heated thermocouple generates a potential difference in the direct current path formed with the electromagnet, forming potential energy; the internal coil of the electromagnetic valve generates a magnetic field with the electromagnet, attracting the electromagnetic sheet; the gas continues to burn, continuously generating potential energy; the valve rod is loosened, the magnetic field keeps the electromagnetic sheet attracted, that is, the open valve state; closing the gas passage / or the gas suddenly goes out, the thermocouple cools down, the potential energy decreases, the magnetic field decreases, the electromagnet cannot attract the electromagnetic sheet, the spring resets, and the sealing gasket seals the gas pipeline, that is, the closed valve state.

[0003] As shown in Figure 2 , the electromagnetic sheet and the copper shaft are connected in a non-tight fitting connection structure after riveting, and the electromagnetic sheet can rotate freely. The purpose of this structure is to avoid stress between the electromagnetic sheet and the electromagnet when they contact, which affects the fitting distance between the two. However, this structure has the following disadvantages: a. During the rotation or up-and-down movement of the electromagnetic sheet, friction will occur at the fitting part of the copper shaft, which will generate copper filings. If the copper filings fall onto the contact surface between the electromagnetic sheet and the electromagnet, it will increase the contact distance between the two, causing the attraction current of the electromagnetic valve to abnormally increase. When the attraction current exceeds the threshold, the electromagnetic valve will fail. The existing solution is to spray a small amount of liquid oil on the contact surface to achieve copper filing adsorption and friction lubrication. However, this method has limitations. Once the copper filings accumulate too much, the adsorption capacity of the liquid oil will be completely lost, and the copper filings will continue to be generated and affect the attraction current, eventually still causing the electromagnetic valve to fail. b. When the copper shaft moves up and down, it will rub against the plastic shell, so the contact surface between the two needs to be coated with lubricating liquid to achieve lubrication, thereby reducing friction loss and copper filings. However, considering the assembly feasibility during mass production, only the upper copper shaft can be sprayed with lubricating liquid, and the contact surface between the lower copper shaft and the plastic shell is not lubricated, which has the risk of dry grinding.

[0004] Therefore, how to avoid wear and tear of the copper shaft, the electromagnetic sheet and the plastic shell is a technical problem that needs to be solved urgently, so as to ensure that the gas flameout device can work normally and lastingly. SUMMARY

[0005] In order to solve the above problems, the valve shaft assembly structure of the domestic gas flameout protection device is provided, which reduces the friction between the valve shaft and the electromagnetic sheet and the plastic shell, thereby improving the failure of the electromagnetic valve caused by the falling of debris and ensuring the long-term normal operation of the gas flameout device.

[0006] The valve shaft assembly structure of the domestic gas flameout protection device is characterized in that the valve shaft is made of a high-molecular wear-resistant self-lubricating material, the bottom of the valve shaft is provided with a plurality of locking positioning petals that are arranged outwardly and downwardly, the plurality of locking positioning petals are arranged in a spaced ring manner, the center area of the bottom of the valve shaft corresponding to the center areas of the plurality of locking positioning petals that are not directly connected to each other is left as a compression space, and the center hole of the electromagnetic sheet is installed and fixed upward along the plurality of locking positioning petals. The upper guiding sleeve of the plastic shell is sleeved on the outer ring surface of the valve shaft at a corresponding height.

[0007] Further features are as follows: The valve shaft is integrally made of nylon material. The outer surface of each locking positioning petal is respectively provided with a locking protrusion and an inner recess positioning groove from bottom to top, the upper part of the center hole of the electromagnetic sheet is provided with an inner convex stop ring structure, the center hole of the electromagnetic sheet is installed upward along the plurality of locking positioning petals, and the axial position of the inner recess stop ring structure corresponds to the position of the inner recess positioning groove of the locking positioning petal after assembly, and the axial position is limited by the outer convex locking protrusion. The top of the valve shaft includes a sealing gasket embedding ring groove, and the inner ring of the sealing gasket is embedded in the sealing gasket embedding ring groove. The valve shaft is provided with an outer convex supporting ring below the sealing gasket embedding ring groove, the bottom of the sealing gasket is supported on the upper surface of the outer convex supporting ring, and the upper end of the spring is top-mounted on the lower surface of the outer convex supporting ring, without a copper gasket, so that the installation is simplified. The radially inner end of the upper surface of the outer convex supporting ring and the lower surface of the sealing gasket embedding ring groove are flush and form an integral structure, and at this time, the lower surface of the sealing gasket is an integral flat structure, which makes the installation and positioning of the sealing gasket simple and fast. The lower surface of the outer convex supporting ring is provided with a sealing gasket supporting reinforcement area at the radially inner end, and the radially outer end of the lower surface of the outer convex supporting ring is a flat pressing area, the radially outer end of the outer convex supporting ring is recessed in the outer peripheral ring surface of the sealing gasket, and the upper end of the spring is top-mounted on the flat pressing area. The sealing gasket support reinforcement area consists of spaced-apart support reinforcement ribs or support cone structures, which ensures that the upper end of the spring is stable and reliable, and ensures that the outwardly convex support ring is firm and stable. It also includes a copper gasket, which is fitted onto the bottom of the sealing gasket, and the upper part of the spring is mounted on the copper gasket. The bottom of the sealing gasket includes an inner lower convex end. The copper gasket includes a radially outer upper ring, a radially central connecting ring, and a radially inner lower ring. The upper surface of the radially inner lower ring is in close contact with the lower surface of the inner lower convex end, and there is a gap between the radially inner ring wall of the radially inner lower ring and the outer circumference of the valve shaft to avoid accidental friction. The inner wall of the radially central connecting ring is in close contact with the lower part of the vertical outer circumference of the inner lower convex end. The upper surface of the radially outer upper ring is in close contact with the lower outer plane of the sealing gasket. The radially outer end of the radially outer upper ring is recessed within the outer circumferential surface of the sealing gasket. The upper end of the spring is mounted on the lower surface of the radially outer upper ring. The plastic housing includes a central stop end, the lower part of the spring is sleeved on the equivalent outer periphery of the upper guide sleeve, and the lower end of the spring is abutted against the central stop end of the plastic housing.

[0008] By adopting the solution of this invention, the original copper shaft is replaced with a valve shaft made of a high-polymer wear-resistant self-lubricating material, and the bottom of the valve shaft is set with several locking and positioning petals that diffuse outward from top to bottom. This allows the central hole of the electromagnetic plate to be installed and fixed upward along the locking and positioning petals. Since the central area of ​​the bottom of the valve shaft has a compression space corresponding to the central area of ​​the locking and positioning petals that are not directly connected to each other, most of the stress generated when the electromagnetic plate contacts the electromagnet is offset by the mating end of the valve shaft at the corresponding position. As a result, only a small amount of friction occurs between the mating end of the electromagnetic plate and the valve shaft. Furthermore, since the valve shaft is made of a high-polymer wear-resistant self-lubricating material, even if the electromagnetic plate rubs against the valve shaft, only a small amount of debris will be generated. In addition, the friction between the plastic shell and the shaft body is reduced. In summary, the entire structure reduces the friction between the valve shaft and the electromagnetic plate and the plastic shell, thereby improving the failure of the electromagnetic valve caused by falling debris and ensuring that the gas flameout device can work normally for a long time. Attached Figure Description

[0009] Figure 1 This is a structural diagram of a gas solenoid valve in the prior art; Figure 2 A cross-sectional schematic diagram of a valve shaft assembly structure in the prior art; Figure 3 This is a cross-sectional schematic diagram of a specific embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram of a specific embodiment two of the present invention; Figure 5This is a schematic diagram showing the distribution of the locking positioning petals and the sealing gasket support reinforcing ribs (multiple sets of support reinforcing ribs) corresponding to specific embodiments one and two of the present invention; The names corresponding to the serial numbers in the diagram are as follows: Valve shaft 10, compression space 101, locking positioning flap 11, locking protrusion 111, concave positioning groove 112, sealing gasket embedding ring groove 12, convex support ring 13, sealing gasket support reinforcement area 131, planar pressing area 132, sealing gasket 20, inner ring 21, outer circumferential surface 22, inner lower convex end 201, outer lower plane 202, spring 30, plastic shell 40, upper guide sleeve 41, middle stop end 42, electromagnetic plate 50, center hole 51, inner convex stop ring structure 52, electromagnet 60, copper gasket 70, radial outer upper ring 71, radial middle connecting ring 72, radial inner lower ring 73. Detailed Implementation

[0010] A valve shaft assembly structure for a household gas flameout protection device, see Figures 3-5 It includes a valve shaft 10, a sealing gasket 20, a spring 30, a plastic housing 40, an electromagnetic plate 50, and an electromagnet 60; the valve shaft 10 is made of a high-molecular wear-resistant self-lubricating material, and the bottom of the valve shaft 10 is provided with several locking and positioning petals 11 that are arranged from top to bottom outwards. The several locking and positioning petals 11 are arranged in a ring at intervals, and the bottom center area of ​​the valve shaft 10 has a compression space 101 corresponding to the center area of ​​the several locking and positioning petals 11 that are not directly connected to each other. The center hole 51 of the electromagnetic plate 50 is installed and fixed from bottom to top along the several locking and positioning petals 11. The upper guide sleeve 41 of the plastic housing 40 is fitted onto the outer ring surface of the valve shaft 10 at the corresponding height position.

[0011] In specific embodiments one and two, the valve shaft 10 is made of nylon material in one piece; the number of locking and positioning petals 11 is four, and the four locking and positioning petals 11 are arranged in a ring at equal intervals; Each locking and positioning petal 11 has a locking protrusion 111 and a concave positioning groove 112 on its outer surface from bottom to top. The upper part of the center hole 51 of the electromagnetic plate 50 is provided with a convex stop ring structure 52. The center hole 51 of the electromagnetic plate 50 is installed from bottom to top along the four locking and positioning petals 11. After assembly, the axial position of the concave stop ring structure 52 corresponds to the position of the concave positioning groove 112 of the locking and positioning petal 11, and the axial position is limited by the convex locking protrusion 111, so that the position of the electromagnetic plate 50 is stable and reliable. The top of the valve shaft 10 includes a gasket mounting groove 12, and the inner ring 21 of the gasket 20 is fitted into the gasket mounting groove 12.

[0012] See Specific Implementation Example 1 Figure 3 and Figure 5A convex support ring 13 is provided below the sealing gasket mounting groove 12 on the valve shaft 10. The bottom of the sealing gasket 20 is supported on the upper surface of the convex support ring 13, and the upper end of the spring 30 is mounted on the lower surface of the convex support ring 13. It does not require a copper gasket, which simplifies the installation. The radial inner end of the upper surface of the convex support ring 13 and the lower surface of the sealing gasket mounting groove 12 are flush and form an integral structure. At this time, the lower surface of the sealing gasket 20 is an integral planar structure, which makes the installation and positioning of the sealing gasket 20 simple and quick. The lower surface of the convex support ring 13 has a sealing gasket support reinforcement area 131 at the radial inner end, and a planar pressing area 132 at the radial outer end of the lower surface of the convex support ring 13. The radial outer end of the convex support ring 13 is recessed into the outer circumferential surface 22 of the sealing gasket 20, and the upper end of the spring 30 is mounted on the planar pressing area 132. The sealing gasket support reinforcement area 131 is a support reinforcement rib or support cone structure arranged at intervals, which ensures that the upper end of the spring 30 is stable and reliable, ensures the firmness and stability of the outward convex support ring 13, and prevents the plastic tray from shrinking and deforming after injection molding.

[0013] It also improves the shaft structure, integrating the copper gasket with the valve shaft into one unit, which simplifies the production process and improves production and assembly efficiency.

[0014] See Specific Implementation Example 2 Figure 4 and Figure 5 It also includes a copper gasket 70, which is fitted onto the bottom of the sealing gasket 20, and the upper part of the spring 30 is mounted on the copper gasket 70. The bottom of the sealing gasket 20 includes an inner lower protrusion 201. The copper gasket 70 includes a radially outer upper ring 71, a radially central connecting ring 72, and a radially inner lower ring 73. The upper surface of the radially inner lower ring 73 is in close contact with the lower surface of the inner lower protrusion 201, and there is a gap between the radial inner ring wall of the radially inner lower ring 73 and the outer circumference of the valve shaft 10 to avoid accidental friction. The inner wall of the radially central connecting ring 72 is in close contact with the lower part of the vertical outer circumference of the inner lower protrusion 201. The upper surface of the radially outer upper ring 71 is in close contact with the outer lower plane 202 of the sealing gasket 20. The radially outer end of the radially outer upper ring 71 is recessed into the outer circumferential surface 22 of the sealing gasket 20. The upper end of the spring 30 is mounted on the lower surface of the radially outer upper ring 71.

[0015] In specific embodiments one and two, the plastic shell 40 includes a central stop end 42, the lower part of the spring 30 is sleeved on the equivalent outer periphery of the upper guide sleeve 41, and the lower end of the spring 30 is mounted on the central stop end 42 of the plastic shell 40.

[0016] Its working principle is as follows: The original copper shaft is replaced with a valve shaft made of a high-polymer wear-resistant self-lubricating material, and the bottom of the valve shaft is set with several locking and positioning petals that diffuse outward from top to bottom. This allows the central hole of the electromagnetic plate to move upward and be fixed along the locking and positioning petals. Since the central area of ​​the bottom of the valve shaft has a compression space corresponding to the central area of ​​the locking and positioning petals that are not directly connected, most of the stress generated when the electromagnetic plate contacts the electromagnet is offset by the mating end of the valve shaft at the corresponding position. As a result, only a small amount of friction occurs between the mating end of the electromagnetic plate and the valve shaft. Furthermore, since the valve shaft is made of a high-polymer wear-resistant self-lubricating material, even if the electromagnetic plate rubs against the valve shaft, only a small amount of debris will be generated. In addition, the friction between the plastic shell and the shaft is reduced. In summary, the entire structure reduces the friction between the valve shaft and the electromagnetic plate and the plastic shell, thereby improving the solenoid valve failure caused by debris falling and ensuring that the gas flameout device can work normally for a long time.

[0017] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0018] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A valve shaft assembly structure of a domestic gas flame failure protection device, comprising a valve shaft, a sealing gasket, a spring, a plastic housing, an electromagnetic sheet and an electromagnet; characterized in that: The valve shaft is made of high polymer wear-resistant self-lubricating material, the bottom of the valve shaft is provided with a plurality of locking positioning petals which are arranged outwardly and downwardly, the plurality of locking positioning petals are arranged in intervals, and the center area of the bottom of the valve shaft corresponding to the center areas of the plurality of locking positioning petals which are not directly connected to each other is left as a compression space, the center hole of the electromagnetic sheet is installed and fixed upward along the plurality of locking positioning petals; The upper guide sleeve of the plastic shell is sleeved on the outer ring surface of the valve shaft at a corresponding height.

2. A valve shaft assembly for a domestic gas flame failure protection device according to claim 1, characterised in that: The valve shaft is integrally made of nylon material.

3. A valve shaft assembly for a domestic gas flame failure protection device according to claim 1, wherein: The outer surface of each locking positioning petal is respectively provided with a locking protrusion and an inner recess positioning groove from bottom to top, the upper part of the center hole of the electromagnetic sheet is provided with an inner convex stop ring structure, the center hole of the electromagnetic sheet is installed upward along the plurality of locking positioning petals, and after assembly, the axial position of the inner recess stop ring structure corresponds to the position of the inner recess positioning groove of the locking positioning petal, and is limited in axial position by the outer convex locking protrusion.

4. A valve shaft assembly for a domestic gas flame failure protection device according to claim 1, wherein: The top of the valve shaft includes a sealing gasket embedding ring groove, and the inner ring of the sealing gasket is embedded in the sealing gasket embedding ring groove.

5. A valve shaft assembly for a domestic gas flame failure protection device according to claim 4, wherein: The bottom of the sealing gasket is supported on the upper surface of the outer convex supporting ring, and the upper end of the spring is top-mounted on the lower surface of the outer convex supporting ring.

6. A valve shaft assembly for a domestic gas flame failure protection device according to claim 5, wherein: The radially inner end of the upper surface of the outer convex supporting ring is flush with the lower surface of the sealing gasket embedding ring groove, and they are an integral structure, and at this time, the lower surface of the sealing gasket is a whole flat structure.

7. A valve shaft assembly for a domestic gas flame failure protection device according to claim 6, wherein: The lower surface of the outer convex supporting ring is provided with a sealing gasket supporting reinforcement zone at the radially inner end, and a flat pressing zone at the radially outer end, the radially outer end of the outer convex supporting ring is recessed in the outer peripheral ring surface of the sealing gasket, and the upper end of the spring is top-mounted on the flat pressing zone.

8. A valve shaft assembly for a domestic gas flame failure protection device according to claim 7, wherein: The sealing gasket supporting reinforcement zone is a supporting reinforcement rib or a supporting conical structure arranged in intervals.

9. A valve shaft assembly for a domestic gas flame failure protection device according to claim 4, wherein: It also includes a copper gasket, the copper gasket is sleeved on the bottom of the sealing gasket, and the upper part of the spring is top-mounted on the copper gasket.

10. A valve shaft assembly for a domestic gas flame failure protection device according to claim 9, wherein: The bottom of the sealing gasket includes an inner lower convex end, the copper gasket includes a radially outer upper ring, a radially middle connecting ring and a radially inner lower ring, the upper surface of the radially inner lower ring is close to the lower surface of the inner lower convex end, the radially inner wall of the radially inner lower ring and the outer ring of the valve shaft are spaced apart to avoid accidental friction, the inner wall of the radially middle connecting ring is close to the lower area of the vertical outer ring of the inner lower convex end, the upper surface of the radially outer upper ring is close to the outer lower flat arrangement of the sealing gasket, the radially outer end of the radially outer upper ring is recessed in the outer peripheral ring surface of the sealing gasket, and the upper end of the spring is top-mounted on the lower surface of the radially outer upper ring.

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