DE212020000558U1 - Sand core of a valve covered with sand - Google Patents

Abstract

Sand-covered sand core of a valve, characterized in that it comprises an upper core body (1), a lower core body (2), an upper core rod (3) and a lower core rod (4), the upper core body (1) having a first comprises upper core section (11) and a second upper core section (12) which are integrally connected to one another, wherein the first upper core section (11) is arranged in a disk shape and horizontally, wherein a lower side of the first upper core section (11) is integral with the second upper Core portion (12) is connected, which is frustoconical, wherein the second upper core portion (12) has an upper part larger than its lower part, wherein on an underside of the second upper core portion (11) the lower core body (2) is arranged, the is frustoconical, the lower core body (2) having a lower part larger than its upper part, wherein within the upper core body (1) the upper core rod (3) is penetrated vertically, the lower core rod (4) being penetrated within the lower core body (2), the upper core rod (3) and the lower core rod (4) being detachably connected to one another.

Description

Technical area

The present invention belongs to the technical field of casting and in particular relates to a sand-covered sand core of a valve.

State of the art

A valve is a line accessory that is used to open and close lines, to control the direction of flow, and to regulate parameters of a conveying medium, such as pressure, flow rate and the like. The valve is required to have high quality, high precision and high tightness and other properties, and is difficult to machine. The casting process for manufacturing valve products is one of the most widely used manufacturing processes. The metal is melted into a liquid that meets the requirements and then poured into a specified valve model, after which the molten liquid is cooled, solidified and cleaned predetermined shape, size and power can be obtained. A cast valve has the properties of good economy and high adaptability and is particularly economical for valve parts with complex shapes, especially with complex interiors.

The sand core of the valve, which is covered with sand, is an important molding used in casting to form an interior of a valve body, and it is poured into the valve body together with the sand mold. During the manufacturing process, however, it was found that the existing sand cores still have many defects that should be further eliminated. For example, the strength of the existing sand core structure is relatively low, and deformations of the product, sand inclusions in the product, and rough product surface etc. can easily occur during the casting process. Furthermore, the existing sand core is stressed due to the low positioning accuracy during the casting or molding process and thus exhibits a certain shift, which leads to unqualified product sizes.

Disclosure of the invention

In view of the shortcomings of the prior art, the present invention provides a sand-covered sand core of a valve to overcome the above shortcomings of the prior art.

To achieve the above object, the present invention proposes the following configuration of: A sand-covered sand core of a valve comprises an upper core body, a lower core body, an upper core rod and a lower core rod, the upper core body having a first upper core portion and a second upper core portion, which are integrally connected to each other, wherein the first upper core portion is disc-shaped and arranged horizontally, wherein a bottom of the first upper core portion is integrally connected to the second upper core portion which is frustoconical, the second upper core portion an upper part larger than its lower part, wherein on a lower side of the second upper core section, the lower core body is arranged, which is frustoconical, the lower core body having a lower part larger than its upper part, wherein within the upper core body, the upper core rod ve rtically penetrated, the lower core rod being penetrated within the lower core body, the upper core rod and the lower core rod being detachably connected to one another.

In the sand-covered sand core of a valve provided by the present invention, the provision of the upper core rod and the lower core rod increases rigidity, so that the problem of excessive deformation during the casting process is avoided. At the same time, the sand-covered sand core of the valve is divided into two sections, namely an upper section and a lower section suitable for operation in a small space.

Another preferred embodiment of the present invention provides that the lower core rod is cylindrical and is provided at its lower end with a positioning section which protrudes from the lower core body. A positioning section is provided on the lower core body in order to ensure precise assembly and positioning and to avoid displacement during assembly.

Another preferred embodiment of the present invention provides that the positioning section has the shape of a hexagonal pyramid and is connected in one piece to the lower core rod.

Another preferred embodiment of the present invention provides that the upper core rod is cylindrical and is integrally formed at its upper end with a lifting ring protruding from the upper core body, which is convenient for handling and temporary placement.

A further preferred embodiment of the present invention provides that a lower end of the upper core rod is further provided with a first connection hole, a second connection hole also being arranged in the lower core rod, a fastening bolt being penetrated within the first connection hole and the second connection hole to enable the releasable connection of the upper core rod and the lower core rod.

Another preferred embodiment of the present invention provides that an upper end of the lower core rod is further provided with a pair of positioning projections, wherein the lower end of the upper core rod is further provided with a pair of positioning holes which are adapted to the positioning projections, wherein the positioning projections can be inserted into or separated from the positioning holes, thereby facilitating accurate positioning.

Another preferred embodiment of the present invention provides that a lower surface of the first upper core section is further provided with an annular overflow channel, a vertically penetrating air outlet hole being provided in the first upper core section, the air outlet hole communicating with the overflow channel. With the above settings, it is convenient that the gas is completely evacuated during the casting process.

Another preferred embodiment of the present invention provides that a wire mesh is wound in each of the upper core body and the lower core body, which reinforces the integrity and structural strength of the upper core body and the lower core body and suppresses the formation of deformations.

Another preferred embodiment of the present invention provides that an exposed surface of the upper core body and the lower core body is each coated with a high-temperature-resistant coating, the high-temperature-resistant coating having a thickness of 0.2 to 0.3 mm. Coating with high temperature resistant coating can prevent sand from sticking, making the surface of castings smooth and clean. The high temperature resistant coating layer can be high temperature resistant epoxy silicone coating or a high temperature resistant silicone coating that can withstand high temperatures of 500 ° C and above.

Advantageous Effects: Compared with the prior art, the sand-covered sand core of a valve provided by the present invention has a reasonable design and a reliable structure, is convenient to assemble, enables accurate positioning, and is not easy during the casting process to deform, so that the dimensional accuracy of the cast parts is ensured and the defects such as sand inclusions in products and rough product surfaces, etc. can be reduced.

Figure list

• 1 Figure 3 shows a perspective schematic view of the present invention;
• 2 Figure 12 is a perspective schematic view of upper and lower core rods of the present invention;
• 3 Figure 3 shows a schematic sectional view of the present invention;
• 4th Figure 3 shows a schematic front view of the present invention;
• 5 shows a sectional view through the plane AA 4th ;
• 6th shows a sectional view through the plane BB from 4th ;
• 7th shows a sectional view through the plane CC 4th ;

List of reference symbols

1

upper core body

2

lower core body

3

upper core rod

11th

first upper core section

12th

second upper core section

31

Lifting ring

32

first connection hole

33

Positioning hole

4th

Positioning section

42

second connection hole

43

Positioning advantage

11th

Overflow channel

112

Air outlet hole

Detailed embodiments

Exemplary embodiments of the present invention are described in detail below. Examples of these embodiments are shown in In the accompanying drawings, in which the same or similar reference characters designate the same or similar elements or elements having the same or similar functions. The exemplary embodiments described below with reference to the accompanying drawings are exemplary, serve to explain the present invention and should not, however, be construed as limiting the present invention.

In the description of the present invention, it should be stated that the alignment or positional relationship, which is defined by the terms "middle", "longitudinal", "transversal", "upper", "below", "in front of", "behind", "Left", "right", "vertical", "horizontal", "apex", "bottom", "inside", "outside" etc. is only based on the orientation or positional relationship shown in the drawings and serves only to facilitate and simplify the description of the present invention, but does not indicate or imply that the designated device or element must have a specific orientation or must be designed and operated in a specific orientation, which is why the terms mentioned do not restrict the present Invention can be understood.

Furthermore, the terms “first” and “second” are only used for description and cannot be understood to indicate or imply a relative importance or the number of specified technical features. Thus, the features defined with “first” and “second” can explicitly or implicitly contain one or more of these features. In the description of the present invention, “plural” is understood to mean two or more than two, unless expressly defined otherwise.

In the present invention, unless expressly stated and defined otherwise, the terms “assemble”, “connect”, “connect”, “fix” etc. should be understood in a broader sense, for example being fixed, detachable or integral Connection, or a mechanical or electrical connection, or a direct connection or an indirect connection via an intermediate medium, or an internal communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood depending on specific situations.

In the present invention, unless expressly stated and defined otherwise, the expression “that a first feature is above or below a second feature” can be understood to mean that the first feature and second feature are in direct contact, or that the first feature and the second feature are not in direct contact, but are in contact therebetween via a further feature. In addition, the expression “that the first feature is located above the second feature, on or above the second feature” is understood to mean that the first feature is located directly or diagonally above the second feature; alternatively, this term only means that the first feature has a level which is higher than the level of the second feature. The expression “that the first feature is located below the second feature or below the second feature” is understood to mean that the first feature is located directly or diagonally below the second feature; alternatively, this term only means that the first feature has a level which is lower than the level of the second feature.

Embodiment 1

A sand core of a valve covered with sand, like 1 until 4th shown comprises an upper core body 1 , a lower core body 2 , an upper core rod 3 and a lower core rod 4th , the upper core body 1 a first upper core section 11th and a second upper core section 12th which are integrally connected to one another, wherein the first upper core portion 11th is disc-shaped and arranged horizontally, with an underside of the first upper core portion 11th integral with the second upper core section 12th is connected, which is frustoconical, the second upper core portion 12th has an upper part larger than its lower part, wherein on a lower side of the second upper core portion 11th the lower core body 2 is arranged, which is frustoconical, the lower core body 2 has a lower part larger than its upper part, being within the upper core body 1 the upper core rod 3 penetrated vertically, being within the lower core body 2 the lower core rod 4th is penetrated, the upper core rod 3 and the lower core rod 4th are releasably connected to each other.

In the present embodiment it is provided that the lower core rod 4th is cylindrical and is provided at its lower end with a positioning portion 41 which consists of the lower core body 2 protrudes.

In the present embodiment it is provided that the upper core rod 3 is cylindrical and at its upper end with a lifting ring 31 which is made up of the upper core body 1 protrudes.

In the present embodiment it is provided that a lower end of the upper Core rod 3 furthermore with a first connection hole 32 is provided, being in the lower core rod 4th also a second connection hole 42 is arranged, wherein within the first communication hole 32 and the second communication hole 42 a fastening bolt is penetrated to releasably connect the upper core rod 3 and the lower core rod 4th to enable.

In the present embodiment it is provided that an upper end of the lower core rod 4th further comprising a pair of positioning protrusions 43 is provided, the lower end of the upper core rod 3 further with a pair of positioning holes 33 is provided that on the positioning projections 43 are adapted, the positioning projections 43 into the positioning holes 33 can be introduced or separated from it.

In the present exemplary embodiment it is provided that a lower surface of the first upper core section 11th is further provided with an annular overflow channel 111, wherein in the first upper core portion 11th also a vertically penetrating air outlet hole 112 is provided, the air outlet hole 112 communicates with the overflow channel 111.

Embodiment 2

A sand core of a valve covered with sand, like 1 until 4th shown comprises an upper core body 1 , a lower core body 2 , an upper core rod 3 and a lower core rod 4th , the upper core body 1 a first upper core section 11th and a second upper core section 12th which are integrally connected to one another, wherein the first upper core portion 11th is disc-shaped and arranged horizontally, with an underside of the first upper core portion 11th integral with the second upper core section 12th is connected, which is frustoconical, the second upper core portion 12th has an upper part larger than its lower part, wherein on a lower side of the second upper core portion 11th the lower core body 2 is arranged, which is frustoconical, the lower core body 2 has a lower part larger than its upper part, being within the upper core body 1 the upper core rod 3 penetrated vertically, being within the lower core body 2 the lower core rod 4th is penetrated, the upper core rod 3 and the lower core rod 4th are releasably connected to each other.

In the present embodiment it is provided that the lower core rod 4th is cylindrical and is provided at its lower end with a positioning portion 41 which consists of the lower core body 2 protrudes.

In the present exemplary embodiment it is provided that the positioning section 41 has the shape of a hexagonal pyramid and is integral with the lower core rod 4th connected is.

In the present embodiment it is provided that the upper core rod 3 is cylindrical and is integral with a lifting ring at its upper end 31 is formed from the upper core body 1 protrudes.

In the present embodiment it is provided that a lower end of the upper core rod 3 furthermore with a first connection hole 32 is provided, being in the lower core rod 4th also a second connection hole 42 is arranged, wherein within the first communication hole 32 and the second communication hole 42 a fastening bolt is penetrated to releasably connect the upper core rod 3 and the lower core rod 4th to enable.

In the present embodiment it is provided that an upper end of the lower core rod 4th further comprising a pair of positioning protrusions 43 is provided, the lower end of the upper core rod 3 further with a pair of positioning holes 33 is provided that on the positioning projections 43 are adapted, the positioning projections 43 into the positioning holes 33 can be introduced or separated from it.

In the present exemplary embodiment it is provided that a lower surface of the first upper core section 11th is further provided with an annular overflow channel 111, wherein in the first upper core portion 11th also a vertically penetrating air outlet hole 112 is provided, the air outlet hole 112 communicates with the overflow channel 111.

In the present embodiment it is provided that in the upper core body 1 and the lower core body 2 each a wire mesh is wrapped, as in 5 until 7th shown.

In the present embodiment it is provided that an exposed surface of the upper core body 1 and the lower core body 2 each coated with a high temperature resistant coating, the high temperature resistant coating having a thickness of 0.2 to 0.3 mm.

Only the preferred embodiments of the present invention are shown above. It should be noted that several improvements can be made by those skilled in the art without departing from the principle of the present invention, and these improvements are also intended to fall within the scope of the present invention.

Claims (9)

Sand-covered sand core of a valve, characterized in that it comprises an upper core body (1), a lower core body (2), an upper core rod (3) and a lower core rod (4), the upper core body (1) having a first comprises upper core section (11) and a second upper core section (12) which are integrally connected to one another, wherein the first upper core section (11) is arranged in a disk shape and horizontally, wherein a lower side of the first upper core section (11) is integral with the second upper Core portion (12) is connected, which is frustoconical, wherein the second upper core portion (12) has an upper part larger than its lower part, wherein on an underside of the second upper core portion (11) the lower core body (2) is arranged, the is frustoconical, the lower core body (2) having a lower part larger than its upper part, the upper core rod (3 ) is penetrated vertically, the lower core rod (4) being penetrated within the lower core body (2), the upper core rod (3) and the lower core rod (4) being detachably connected to one another. Sand core of a valve covered with sand Claim 1 , characterized in that the lower core rod (4) is cylindrical and is provided at its lower end with a positioning portion (41) which protrudes from the lower core body (2). Sand core of a valve covered with sand Claim 2 , characterized in that the positioning portion (41) has the shape of a hexagonal pyramid and is integrally connected to the lower core rod (4). Sand core of a valve covered with sand Claim 1 , characterized in that the upper core rod (3) is cylindrical and is formed at its upper end in one piece with a lifting ring (31) which protrudes from the upper core body (1). Sand core of a valve covered with sand Claim 1 , characterized in that a lower end of the upper core rod (3) is further provided with a first connection hole (32), wherein a second connection hole (42) is further arranged in the lower core rod (4), wherein inside the first connection hole (32 ) and the second connecting hole (42) is penetrated by a fastening bolt in order to enable the releasable connection of the upper core rod (3) and the lower core rod (4). Sand core of a valve covered with sand Claim 5 , characterized in that an upper end of the lower core rod (4) is further provided with a pair of positioning projections (43), the lower end of the upper core rod (3) is further provided with a pair of positioning holes (33) which are connected to the positioning projections (43) are adapted, wherein the positioning projections (43) can be inserted into the positioning holes (33) or separated therefrom. Sand core of a valve covered with sand Claim 1 , characterized in that a lower surface of the first upper core section (11) is further provided with an annular overflow channel (111), wherein a vertically penetrating air outlet hole (112) is further provided in the first upper core section (11), the air outlet hole (112 ) communicates with the overflow channel (111). Sand core of a valve covered with sand Claim 1 , characterized in that a wire mesh is wound in each of the upper core body (1) and the lower core body (2). Sand-covered sand core of a valve according to one of the Claims 1 until 8th , characterized in that an exposed surface of the upper core body (1) and the lower core body (2) is each coated with a high temperature resistant coating, the high temperature resistant coating having a thickness of 0.2 to 0.3 mm.

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