Valve core, pressure limiting valve assembly, cooking utensil and valve core processing method

Abstract

The present invention provides a valve core, a pressure-limiting valve assembly, a cooking utensil, and a method for processing the valve core. The valve core includes: a connector, a connector having a connecting surface at the bottom thereof, and the connector is made of stainless steel, copper, or aluminum alloy; a seal, a portion of the outer surface of the seal is adapted to and in contact with the connecting surface, and the seal is made of stainless steel, copper, or aluminum alloy, and the seal has a spherical sealing surface; wherein the edge of the connecting surface is connected to the position where the seal matches by welding. The technical solution of the present application effectively solves the problems in the related art that the valve core is prone to aging, the processing technology is complicated, or the sealing effect is poor.

Description

Technical Field

[0001] The invention relates to the field of electric pressure cookers, and in particular to a valve core, a pressure limiting valve component, a cooking utensil and a method for processing the valve core. Background Art

[0002] The electric pressure cooker is equipped with a pressure limiting valve assembly, which enables the electric pressure cooker to cook at the rated pressure. When the internal pressure of the electric pressure cooker exceeds the rated pressure, the pressure in the pot will break open the pressure limiting valve assembly to exhaust and release the pressure. The sealing performance of the pressure limiting valve assembly is very important for the pressure generated inside the electric pressure cooker, and the core sealing component of the pressure limiting valve assembly is the valve core. The valve core materials of the related technology include silicone, ceramic, and stainless steel.

[0003] Silicone valve cores are prone to aging; ceramic valve cores must be precision molded and then subjected to complex processing techniques such as high-temperature sintering, cleaning, and grinding; stainless steel valve cores have a conical valve core surface, which is in line contact with the exhaust pipe contact surface, resulting in poor sealing effects. Summary of the invention

[0004] The present invention aims to provide a valve core, a pressure-limiting valve assembly, a cooking utensil and a valve core processing method, so as to solve the problems in the related art that the valve core is easy to age or the processing technology is complicated or the sealing effect is poor.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a valve core is provided, including: a connecting piece, a connecting surface is arranged at the bottom of the connecting piece, and the connecting piece is made of stainless steel, copper or aluminum alloy; a sealing piece, a part of the outer surface of the sealing piece is adapted to and contacts with the connecting surface, and the sealing piece is made of stainless steel, copper or aluminum alloy, and the sealing piece has a spherical sealing surface; wherein, the edge of the connecting surface is connected to the matching position of the sealing piece by welding.

[0006] Furthermore, the connection surface is a plane, the sealing element is a partial sphere, the outer surface of the partial sphere includes a sealing surface and a matching plane, and the matching plane is adapted to the shape of the connection surface and is in contact with it.

[0007] Furthermore, the sealing member is a hemispherical body, the connecting member is a columnar body, and the maximum diameter of the connecting member is greater than or equal to the diameter of the sealing member.

[0008] Furthermore, the sealing member is a hemispherical body, the connecting member is a columnar body, and the maximum diameter of the connecting member is smaller than the diameter of the sealing member.

[0009] Furthermore, a spherical groove is provided at the bottom of the connector, the groove surface of the spherical groove forms a connecting surface, the seal is a sphere, part of the outer surface of the sphere is accommodated in the spherical groove and is adapted to and in contact with the groove surface shape of the spherical groove.

[0010] Furthermore, the welding connection is laser welding, aluminothermic welding or vibration friction welding.

[0011] Furthermore, the coaxiality between the connecting member and the sealing member is between 0 and 0.05 mm.

[0012] Furthermore, the position where the edge of the connection surface matches the sealing member has a welding width, and the welding width is between 0.8 mm and 1.2 mm.

[0013] Furthermore, a stop structure is provided on the connecting piece.

[0014] Furthermore, the stop structure is an annular groove arranged on the circumferential side wall of the connecting piece.

[0015] According to another aspect of the present invention, a cooking appliance is provided, comprising a pressure-limiting valve assembly, wherein the pressure-limiting valve assembly is the above-mentioned pressure-limiting valve assembly.

[0016] Furthermore, the cooking appliance is an electric pressure cooker, which includes a pot body and a pot cover, an exhaust pipe is arranged on the pot cover, and the pressure limiting valve assembly is arranged at the exhaust pipe.

[0017] According to another aspect of the present invention, a pressure-limiting valve assembly is provided. The pressure-limiting valve assembly includes a valve body and a valve core. The valve body has a valve cavity. The valve core is connected to the valve body and partially disposed in the valve cavity. The valve core is the valve core mentioned above.

[0018] According to another aspect of the present invention, a valve core processing method is provided, which is used to process the above-mentioned valve core, and the processing method includes the following steps: positioning and fixing the connecting part and the sealing part so that the connecting part and the sealing part are coaxially arranged; welding the edge of the connecting surface and the sealing part at the position where the edge of the connecting surface cooperates with the sealing part, forming a fusion line at the position where the edge of the connecting surface and the sealing part cooperate with each other, and cooling to obtain a semi-finished valve core; grinding the fusion line to form the valve core.

[0019] The technical solution of the present invention is applied, and the valve core includes a connector and a seal. A connector is provided with a connector surface at the bottom, and the connector is made of stainless steel, copper or aluminum alloy. Part of the outer surface of the seal matches the shape of the connector surface and contacts with it. The seal is made of stainless steel, copper or aluminum alloy, and the seal has a spherical sealing surface. In the present application, the edge of the connector surface is connected by welding to the position where the seal matches. The connector and the seal are both made of stainless steel, copper or aluminum alloy, and the valve core made of the above materials is not easy to age or deform. At the same time, the above materials not only ensure the hardness of the valve core, but also easily ensure the smoothness of the outer surface of the seal. In addition, part of the outer surface of the seal matches the shape of the connector surface and contacts with it, so that the connector and the seal match more closely. The edge of the connector surface is connected by welding to the position where the seal matches, so that the valve core processing is simpler and easier to form. At the same time, the spherical sealing surface can ensure the sealing reliability with the exhaust pipe of the electric pressure cooker, thereby ensuring the sealing effect of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic cross-sectional structure diagram of a valve core according to a first embodiment of the present invention is shown;

[0022] Figure 2 Shows Figure 1 A schematic diagram of the structure of the connecting parts and sealing parts of the valve core;

[0023] Figure 3 A schematic diagram of the three-dimensional structure of a valve core according to a second embodiment of the present invention is shown;

[0024] Figure 4 A schematic cross-sectional view of an embodiment of a pressure limiting valve assembly according to the present invention is shown;

[0025] Figure 5 Shows Figure 4 A schematic diagram of the three-dimensional structure of a valve body of a pressure limiting valve assembly;

[0026] Figure 6 Shows Figure 4 A cross-sectional schematic diagram of a pressure limiting valve assembly connected to an exhaust pipe; and

[0027] Figure 7 A schematic diagram of the valve core structure obtained according to an embodiment of the valve core processing method of the present invention is shown.

[0028] The above drawings include the following reference numerals:

[0029] 1. Valve core; 2. Valve body; 3. Valve cavity; 4. Counterweight; 5. Exhaust pipe; 6. Exhaust hole; 7. Injection molding part; 10. Connector; 11. Connecting surface; 11a. Spherical groove; 12. Annular groove; 20. Sealing member; 21. Sealing surface. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0033] like Figure 1 and Figure 2As shown, the valve core of the first embodiment includes: a connector 10 and a sealing member 20. A connecting surface 11 is provided at the bottom of the connector 10, and the connector 10 is made of stainless steel, copper or aluminum alloy. Part of the outer surface of the sealing member 20 is adapted to and contacts the connecting surface 11, and the sealing member 20 is made of stainless steel, copper or aluminum alloy, and the sealing member 20 has a spherical sealing surface 21. The edge of the connecting surface 11 and the position where the sealing member 20 matches are connected by welding.

[0034] The technical solution of the first embodiment is applied, and the valve core includes a connector 10 and a seal 20. The edge of the connecting surface 11 is connected to the position where the seal 20 matches by welding. The connector 10 and the seal 20 are both made of stainless steel, copper or aluminum alloy, and the valve core of stainless steel, copper or aluminum alloy is not easy to age or deform. At the same time, the above-mentioned material not only ensures the hardness of the valve core, but also easily ensures the smoothness of the outer surface of the seal 20, thereby improving the smoothness of the sealing surface 21. In addition, part of the outer surface of the seal 20 is adapted to the shape of the connecting surface 11 and contacts and matches, so that the connector 10 and the seal 20 match more closely. The edge of the connecting surface 11 is connected to the position where the seal 20 matches by welding, so that the valve core processing is simpler and easy to form. At the same time, the spherical sealing surface 21 can ensure the sealing reliability with the exhaust pipe of the electric pressure cooker, thereby ensuring the sealing effect of the valve core.

[0035] It should be noted that, in the present application, the spherical sealing surface 21 does not refer to a sealing surface that is a complete sphere surface, but refers to a partial surface of a complete sphere.

[0036] like Figure 1 and Figure 2 As shown, in the first embodiment, the connection surface 11 is a plane, and the sealing member 20 is a partial sphere. The partial sphere here refers to the structure left after a part of a complete sphere is cut off by a plane. The partial sphere may be larger than a hemisphere or smaller than a hemisphere. The outer surface of the partial sphere includes a sealing surface 21 and a matching plane, and the matching plane is adapted to the shape of the connection surface 11 and contacts with it. The connection surface 11 and the matching plane are both planes, which makes it easy to position and can better ensure the accuracy of the valve core.

[0037] In order to further ensure the sealing accuracy between the sealing member 20 and the exhaust hole 6, the sealing member 20 is a hemispherical body. Figure 5 In the cross-sectional schematic diagram of the exhaust pipe 5 shown, a sealing slope is provided at the exhaust hole 6, which can ensure the contact area with the hemisphere, so that the seal 20 can achieve surface contact when sealing the exhaust hole 6, ensuring a good sealing effect.

[0038] like Figure 1 and Figure 2As shown, in the first embodiment, in order to facilitate processing and simple molding, the connector 10 is cylindrical, and the maximum diameter of the connector 10 is equal to the diameter of the seal 20. In other embodiments not shown in the figures, the connector is cylindrical, and the maximum diameter of the connector is greater than or less than the diameter of the seal. That is, the maximum diameter of the connector and the diameter of the spherical surface of the seal may not be equal, as long as the spherical surface of the seal can seal the exhaust hole, the maximum diameter of the connector and the external shape of the diameter of the spherical surface of the seal can be set according to actual conditions.

[0039] like Figure 1 As shown, in the first embodiment, the welding connection is laser welding or aluminothermic welding or vibration friction welding. The above welding method makes the valve core easy to process, has a low manufacturing cost and a long service life.

[0040] like Figure 1 As shown, in the first embodiment, the coaxiality between the connecting member 10 and the sealing member 20 is between 0 and 0.05 mm. In this way, the valve core has a high finished product qualification rate.

[0041] like Figure 1 and Figure 2 As shown, the position A where the edge of the connection surface 11 matches the sealing member 20 has a welding width, and the welding width is between 0.8 mm and 1.2 mm. In the first embodiment, the above welding width can ensure the connection strength between the connection surface 11 and the sealing member 20 without generating excess welding slag splashing onto the sealing surface 21 of the sealing member 20. Furthermore, the above welding width takes into account both the connection strength and the surface smoothness of the sealing surface 21.

[0042] like Figure 1 and Figure 2 As shown, a stop structure is provided on the connector 10. The stop structure makes the connection between the connector 10 and the valve body tighter. The stop structure is an annular groove 12 provided on the circumferential side wall of the connector 10. The stop structure of the connector 10 is an annular groove 12. The connector 10 is fixedly connected to the valve body, and the annular groove 12 prevents the connector 10 from moving along the axial direction of the valve body, thereby increasing the reliability of the connector 10 being fixed to the valve body. The connector 10 includes a main body section, a necking section and a stop section from bottom to top. The annular groove 12 is formed between the main body section, the necking section and the stop section. The outer diameter of the necking section is the smallest, followed by the stop section, and the outer diameter of the main body section is the largest. The width of the annular groove 12 along the axial direction of the connector 10 is greater than the thickness of the stop section.

[0043] like Figure 3As shown, in the second embodiment of the valve core of the present application, the difference from the first embodiment lies in the structure of the connection surface of the connector 10 and the structure of the sealing member 20 of the present embodiment. In the second embodiment, a spherical groove 11a is provided at the bottom of the connector 10, and the groove surface of the spherical groove 11a forms a connection surface, and the sealing member 20 is a sphere. Part of the outer surface of the sphere is accommodated in the spherical groove 11a and is adapted to and in contact with the groove surface shape of the spherical groove 11a. The notch of the spherical groove 11a is connected to the position B of the sealing member 20 by welding. The spherical groove 11a can ensure surface-to-surface contact with the sealing member 20, and can also play a certain positioning role, so that the center line passing through the center of the sphere of the sealing member 20 and extending along the axial direction of the connector 10 coincides with the center line of the connector 10 as much as possible, thereby improving the matching accuracy.

[0044] The present application also provides a pressure limiting valve assembly, such as Figures 4 to 6 As shown, the pressure limiting valve assembly of this embodiment includes a valve body 2 and a valve core 1. The valve body 2 has a valve cavity 3. The valve core 1 is connected to the valve body 2 and is partially disposed in the valve cavity 3. The valve core is the above-mentioned valve core. The above-mentioned valve core can solve the problem of easy aging of the valve core or complicated processing technology in the related art. In this embodiment, as Figure 5 As shown, the valve body 2 is formed by an injection molding process, which is convenient for processing and molding.

[0045] like Figure 6 As shown, in this embodiment, the diameter of the valve core 1 is larger than the diameter of the opening of the exhaust hole 6, but smaller than the outer diameter of the exhaust pipe 5. The valve body 2 includes an injection molded portion 7 and a counterweight 4. A through hole is provided on the central axis of the counterweight 4, and there is a gap between the through hole and the valve core 1 in the radial direction of the counterweight 4. The counterweight 4 can increase a certain weight, so that when the valve core 1 contacts the exhaust pipe 5, the spherical surface of the valve core 1 is pressed more tightly against the opening of the exhaust hole 6.

[0046] like Figure 4 As shown, in this embodiment, the valve core 1 is placed at the upper end of the valve cavity 3, so that the plane where the neck section and the main section of the connector are connected is slightly higher than the upper end surface of the valve cavity 3. The counterweight 4 and the valve core 1 are injection molded into an integral structure through the injection molding part 7. Specifically, the counterweight 4 and the valve core 1 are placed in an injection molding machine, and the injection molding part 7 is formed by injection molding and the counterweight 4 and the valve core 1 are fixed.

[0047] The present application also provides a cooking utensil. In this embodiment, the cooking utensil of this embodiment includes a pressure limiting valve assembly, and the pressure limiting valve assembly is the above-mentioned pressure limiting valve assembly. The above-mentioned pressure limiting valve assembly can solve the problem of low connection accuracy between the connecting piece of the pressure limiting valve and the ball valve of the pressure limiting valve in the related art.

[0048] In this embodiment, the cooking appliance is an electric pressure cooker, which includes a pot body and a pot cover. The pot cover is provided with an exhaust pipe 5 , and the pressure limiting valve assembly is arranged at the exhaust pipe 5 .

[0049] The present application also provides a valve core processing method. The valve core processing method of this embodiment is used to process the valve core (such as Figure 7 The processing method includes the following steps: positioning and fixing the connector and the seal so that the connector and the seal are coaxially arranged; welding the edge of the connecting surface at the position where the seal matches, forming a fusion line at the position where the edge of the connecting surface matches the seal and cooling to obtain a semi-finished valve core; grinding the fusion line to form the valve core.

[0050] The valve core obtained by the above processing method includes a connector and a seal. The welding process can solve the problem of easy aging of the valve core or complicated processing technology in the related technology. Grinding the fusion line makes the edge of the connection surface and the position where the seal matches smoother, and at the same time, prevents the welding slag generated during welding from falling on the seal and affecting the sealing effect.

[0051] Preferably, the grinding process is a tumbling process, through which the burrs of the semi-finished valve core can be removed to form a finished valve core.

[0052] In a preferred embodiment of the present application, the valve core is formed by laser welding of a connector and a seal. The connector is made of stainless steel, and the seal is a stainless steel ball. The connector is obtained by turning before welding, and the stainless steel ball is a steel ball with a smooth surface obtained by existing technology. During the processing, the connector and the stainless steel ball are placed horizontally in the machine for fixing, and when the machine rotates, a mechanical axis is formed to drive the connector and the stainless steel ball to rotate together. At the same time, the axis of the connector and the center of the stainless steel ball can be in the same straight line, and the allowable deviation is between 0 and 0.05 mm. During the processing, the edge of the laser welding radiation connection surface is matched with the seal, so that their surfaces are melted into a circle of fusion line, which is a shallow fusion line with a width between 0.8 mm and 1.2 mm. Subsequently, the valve core is quickly cooled so that the shape and size of the connector and the stainless steel ball remain basically unchanged, and the sealing surface of the stainless steel ball will not be radiated and disturbed, which can ensure the sealing of the finished valve core.

[0053] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A valve core, characterized in that: include: A connecting piece (10), wherein a connecting surface (11) is provided at the bottom of the connecting piece (10), and the connecting piece (10) is made of stainless steel, copper or aluminum alloy; A sealing member (20), wherein a portion of an outer surface of the sealing member (20) is adapted in shape and in contact with the connecting surface (11), the sealing member (20) is made of stainless steel or copper or aluminum alloy, and the sealing member (20) has a spherical sealing surface (21); Wherein, the edge of the connecting surface (11) and the matching position of the sealing member (20) are connected by welding; A spherical groove (11a) is provided at the bottom of the connecting member (10), the groove surface of the spherical groove (11a) forming the connecting surface (11), and the sealing member (20) is a sphere, a portion of the outer surface of the sphere is accommodated in the spherical groove (11a) and is adapted to and in contact with the groove surface shape of the spherical groove (11a).

2. The valve core according to claim 1, characterized in that: The welding connection is laser welding, aluminothermic welding or vibration friction welding.

3. The valve core according to claim 1, characterized in that: The coaxiality between the connecting member (10) and the sealing member (20) is between 0 and 0.05 mm.

4. The valve core according to claim 1, characterized in that: The position where the edge of the connection surface (11) matches the sealing component (20) has a welding width, and the welding width is between 0.8 mm and 1.2 mm.

5. The valve core according to claim 1, characterized in that: A stop structure is provided on the connecting piece (10).

6. The valve core according to claim 5, characterized in that: The stop structure is an annular groove (12) arranged on the circumferential side wall of the connecting piece (10).

7. A pressure-limiting valve assembly, comprising a valve body (2) and a valve core (1), the valve body (2) having a valve cavity (3), the valve core (1) being connected to the valve body (2) and partially disposed in the valve cavity (3), characterized in that: The valve core is the valve core according to any one of claims 1 to 6.

8. A cooking appliance, comprising a pressure limiting valve assembly, characterized in that: The pressure-limiting valve assembly is the pressure-limiting valve assembly according to claim 7.

9. The cooking device according to claim 8, characterized in that: The cooking appliance is an electric pressure cooker, comprising a cooker body and a cooker cover, the cooker cover being provided with an exhaust pipe (5), and the pressure limiting valve assembly being provided at the exhaust pipe (5).

10. A method for processing a valve core, used for processing the valve core according to any one of claims 1 to 6, characterized in that: The processing method comprises the following steps: Positioning and fixing the connecting member and the sealing member so that the coaxiality of the connecting member and the sealing member is within a predetermined range; Performing welding processing on the position where the edge of the connection surface matches with the sealing member, forming a fusion line at the position where the edge of the connection surface matches with the sealing member, and cooling the fusion line to obtain a semi-finished valve core; The fusion line is ground to form a valve core.

Images