CN115704503A

CN115704503A - Core tube assembly and valve

Info

Publication number: CN115704503A
Application number: CN202110924672.1A
Authority: CN
Inventors: 李瑞锋; 黄路路
Original assignee: Bosch Rexroth Changzhou Co Ltd
Current assignee: Bosch Rexroth Changzhou Co Ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2023-02-17
Also published as: WO2023016169A1

Abstract

The present application provides a core tube assembly and a valve. The core tube assembly includes: a first section extending in an axial direction and having a first connection face; a second section extending in an axial direction and having a second connection face; a welding body located between the first connection face and the second connection face and configured to connect the first connection face and the second connection face into a whole; wherein at least one of the first connection face and the second connection face includes: a tapered first surface formed from the outer surface and a second surface formed from the inner surface extending in a radial direction, the first section, the second section and the weld body collectively defining a cavity, the cavity having a stop end surface, the first surface and the second surface being positioned proximate the stop end surface; and wherein a ratio of a first diameter of a circle formed by an intersection of the first surface and the second surface in the axial direction to a second diameter of the outer surface is between 0.86 and 0.95.

Description

Core tube assembly and valve

Technical Field

The present application relates to the field of valve structures. More particularly, the present application relates to a core assembly that aims to provide a reliable and efficient worm gear assembly solution. The present application also relates to a valve comprising the core tube assembly described above.

Background

Electromagnetic directional valves are widely used for fluid transfer and typically include a core tube or core tube assembly. A typical iron core tube or tube assembly is generally cylindrical in construction and may include a plurality of sections, each section being integrally connected by welding. For example, the welding may be performed around the outer surface of the core tube or core tube assembly. The core tube or core tube assembly may have different dimensions, for example having a diameter of 14mm, 16mm, 23mm, etc.

Disclosure of Invention

It is an object of an aspect of the present application to provide a core tube assembly which aims to provide a reliable and stable core tube assembly welding solution. It is an object of another aspect of the present application to provide a valve including the above-described core tube assembly.

The purpose of the application is realized by the following technical scheme:

a core tube assembly comprising:

a first section extending in an axial direction and having a first connection face;

a second section extending in an axial direction and having a second connection face;

a welding body located between the first connection face and the second connection face and configured to connect the first connection face and the second connection face integrally;

wherein at least one of the first connection face and the second connection face includes: a tapered first surface formed from the outer surface and a second surface formed from the inner surface extending in a radial direction, the first section, the second section and the weld body collectively defining a cavity, the cavity having a stop end surface, the first surface and the second surface being positioned proximate the stop end surface; and is

Wherein a ratio of a first diameter of a circle formed by an intersection of the first surface and the second surface in the axial direction to a second diameter of the outer surface is between 0.86 and 0.95.

In the above-described cartridge assembly, optionally, the cavity is configured to receive a moving iron.

In the above-described core assembly, optionally, the other of the first connection face and the second connection face includes: a tapered third surface is formed from the outer surface and extends all the way from the outer surface to the inner surface.

In the above-described core assembly, optionally, a wall is formed between the outer surface and the inner surface, the wall having a first thickness in a radial direction.

In the above core tube assembly, optionally, the second surface has a second thickness in the radial direction, the second thickness being sized between 0.05 and 0.7 times the first thickness.

In the above-described cartridge assembly, optionally, the cavity extends through the second section, and the stop end surface is positioned at the first section; the stop end surface is spaced from the second surface by a first distance along the axial direction, the first distance being between 1.75mm and 2.15 mm.

In the above-described core tube assembly, optionally, the weld is formed by copper build-up welding between the first joint face and the second joint face.

In the above-described cartridge assembly, optionally, the outer surface is cylindrical at the first connection face and the second connection face and has a diameter of between 17.5mm and 18.5mm in axial cross section.

A valve, comprising:

a valve body;

the above core tube assembly attached to the valve body;

a coil sleeved on the core tube assembly; and

a nut attached to the core tube assembly and fixing the coil in position relative to the core tube assembly.

In the above valve, optionally, the valve is a solenoid directional valve.

Drawings

The present application will now be described in further detail with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will appreciate that the drawings are designed solely for the purposes of illustrating preferred embodiments and that, accordingly, should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are intended to be conceptual in nature or configuration of the depicted objects and may contain exaggerated displays. The figures are also not necessarily drawn to scale.

FIG. 1 is a perspective view of one embodiment of a core tube assembly of the present application.

Fig. 2 is a partial cross-sectional view of the embodiment shown in fig. 1.

Fig. 3 is an enlarged view of a portion A1 of the embodiment shown in fig. 2.

Fig. 4 is an enlarged view of portion A2 of the embodiment shown in fig. 3.

Detailed Description

Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the description is illustrative only, exemplary, and should not be construed as limiting the scope of the application.

First, it should be noted that the terms top, bottom, upward, downward, and the like as used herein are defined with respect to the orientation in the drawings. These orientations are relative concepts and will therefore vary depending on the position and state in which they are located. These and other directional terms are not to be construed in a limiting sense.

Furthermore, it should also be noted that for any single technical feature described or implicit in the embodiments herein or shown or implicit in the drawings, these technical features (or their equivalents) can be continuously combined to obtain other embodiments not directly mentioned herein.

It should be noted that in different drawings, the same reference numerals denote the same or substantially the same components.

FIG. 1 is a perspective view of one embodiment of the core tube assembly of the present application. As shown, the core tube assembly 100 of the present application has a generally cylindrical outer shape. Furthermore, the right-hand side in fig. 1 also schematically shows a component 210 for connection to a moving iron, not shown.

Fig. 2 is a partial cross-sectional view of the embodiment shown in fig. 1. As shown, the core tube assembly 100 includes: a first section 110, a second section 120, and a welded body 130. For clarity, the upper half of the core tube assembly 100 in figures 2 and 3 is shown in cross section, and the lower half of the core tube assembly 100 is shown as the outer surface 101. In fig. 2 to 4, the portions occupied by the solder bodies 130 are shown by grid lines.

The first section 110 and the second section 120 each extend in the axial direction a, a first connection face 111 being provided at an end of the first section 110 facing the second section 120, and a second connection face 121 being provided at an end of the second section 120 facing the first section 110. The first section 110 and the second section 120 are each configured to have a generally cylindrical shape. In one embodiment, the first section 110 and the second section 120 have a diameter of about 18mm in axial cross-section. In some embodiments, the first section 110 and the second section 120 have an outer diameter between 17.5mm and 18.5mm in axial cross-section.

The axial direction referred to herein refers to the direction indicated by the arrow a in fig. 2, and the radial direction referred to herein refers to the direction indicated by the arrow R in fig. 2. In other words, the axial direction a is substantially the same as the height direction of the cylindrical shape of the first and

second sections

110, 120, while the radial direction R is substantially the same as the radial direction of the circular cross-section of the cylindrical shape described above.

Welded body 130 is attached between first section 110 and second section 120. More specifically, the solder body 130 is formed between the first connection face 111 and the second connection face 121, and the solder body 130 may be completed by performing a copper-facing welding between the first connection face 111 and the second connection face 121. For example, the first section 110 and the second section 120 may be comprised of iron, steel, or stainless steel. The solder body 130 may be composed of solder including copper. In the above embodiment, the welded body 130 is formed of a non-magnetic conductive material (e.g., brass), and generation of an excessive electromagnetic force can be suppressed to ensure control of the valve element, particularly in the case of high-frequency control of the solenoid valve. Inner and outer surfaces of weld body 130 may be machined flush with first and

second segments

110, 120, respectively, such that inner and outer surfaces of weld body 130 form a portion of outer surface 101 and inner surface 102, respectively.

The moving iron 200 is movably disposed within the cavity 140 and is coupled to the member 210. The working principle of moving iron and cavity is known in the art and therefore will not be described in detail herein.

Fig. 3 is an enlarged view of a portion A1 of the embodiment shown in fig. 2, and fig. 4 is an enlarged view of a portion A2 of the embodiment shown in fig. 3. As shown in fig. 3 and 4, at least one of the first connection face 111 and the second connection face 121 is composed of two sections: an extending first surface 131 formed starting from the outer surface 101 and tapering or tapering along the axial direction a and a second surface 132 formed starting from the inner surface 102 and extending along the radial direction R. In the illustrated embodiment, the first connection face 111 includes a first surface 131 and a second surface 132. Thus, the first surface 131 and the second surface 132 together form the shape of a blunt V-groove for welding.

Further, the other of the first and second connection faces 111 and 121 may include only a tapered third surface 133 formed from the outer surface 101. The third surface 133 may extend all the way from the outer surface 101 to the inner surface 102. In the illustrated embodiment, the second connection face 121 includes a third surface 133. Thus, the third surface 133 forms the shape of a V-groove for welding.

In yet another embodiment, the first connection face 111 and the second connection face 121 may be composed of a tapered section and a planar section, respectively, thus forming what is referred to as a V-belt blunt bevel. Such a configuration also facilitates the copper build-up welding between the first joint face 111 and the second joint face 121 to form a welded body.

The combination of the groove shapes can reduce the groove processing amount and improve the capability of transmitting output force when the moving iron of the whole core pipe assembly moves from a zero position to a certain moving distance. The core tube assembly 100 of the present application can improve the magnitude of the force output compared to a core tube assembly welded using a V-groove.

The intersection of the first and

second surfaces

131, 132 also forms a circular shape extending around the circumference of the entire core tube assembly 100 in the axial direction, the ratio between a first diameter Dn of the circle and a second diameter OD of the cross-section of the first and second sections 110, 120 (in other words, the diameter of the circular profile of the outer surface 101) may be between 0.86 and 0.95. For example, the first diameter Dn of the circle may be about 15.9mm.

Further, the outer surface 101 of the core tube assembly 100 is configured to lie substantially on the same cylindrical surface and the inner surface 102 of the core tube assembly 100 defines a cavity 140 therein. In one embodiment, cavity 140 may be defined by first section 110, weld 130, and second section 120. A wall 150 is formed between the outer surface 101 and the inner surface 102, and the wall 150 has a first thickness T1 in the radial direction R. In one embodiment, the outer surface 101 of the core tube assembly 100 extends through the first section 110, the welded body 130, and the second section 120. In another embodiment, the inner surface 102 of the core tube assembly 100 extends through the first section 110, the welded body 130 and the second section 120. In yet another embodiment, the wall 150 has a substantially uniform thickness along the entire axial direction a. That is, the first thickness T1 is substantially constant along the axial direction a.

In one embodiment, the second surface 132 has a second thickness T2 in the radial direction, and the second thickness T2 may be sized between 5% -70% of the first thickness T1. In other words, the second thickness T2 may be sized between 0.05 and 0.7 times the first thickness T1, which may result in a ratio between the connection point of the second surface 132 and the first surface 131 to, in one embodiment, the second diameter OD (in other words, the diameter of the circular profile of the outer surface 101) of the first thickness T1 and the first and

second sections

110 and 120 in axial cross-section may be between 0.075 and 0.091.

In addition, the cavity 140 extends through the entire second section 120 and the welded body 130 and terminates at a stop end face 141 in the first section 110. The stop end surface 141 may be disposed perpendicular to the axial direction a and spaced apart from the second surface 132 along the axial direction a. The separation distance is represented by a first distance D1. In one embodiment, the first distance D1 may be between 1.75mm and 2.15 mm. For example, the first distance D1 may be 1.9mm. In the illustrated embodiment, the first surface 131 and the second surface 132 may be positioned closer to the stop end surface 141 than the third surface 133. In other words, the first connection surface 111 is closer to the stopper end surface 141 than the second connection surface 121.

The stop face 141 functions to define the limit of movement of the moving iron 200 after it is energized. In one embodiment, the movable iron 200 can move within the cavity 140 up to a position of contact with the stop face 141.

The present application further provides a valve. The valve may comprise: a valve body, a core tube assembly 100 according to the above, attached to the valve body, a coil sleeved on the core tube assembly 100, and a nut for fixing the coil to the core tube assembly 100.

The coil may have a larger outer diameter than the core tube assembly 100. For example, the coil may have a diameter of 37-45 mm.

In one embodiment, the valve is a solenoid directional valve. In another embodiment, the coil may be selectively energized to perform the function of a directional valve. The working principle of the directional valve is known to the person skilled in the art and will not be described in further detail herein.

The core tube assembly and the valve have the advantages of simplicity, reliability, easiness in implementation, convenience in use and the like. By adopting the core tube assembly and the valve, the assembly efficiency of each component can be improved, and the output performance can be improved.

This written description discloses the application with reference to the drawings, and also enables one skilled in the art to practice the application, including making and using any devices or systems, selecting appropriate materials, and using any incorporated methods. The scope of the present application is defined by the claims and encompasses other examples that occur to those skilled in the art. Such other examples are to be considered within the scope of protection defined by the claims as long as they include structural elements that do not differ from the literal language of the claims, or that they include equivalent structural elements with insubstantial differences from the literal language of the claims.

Claims

1. A core tube assembly, comprising:

a first section (110) extending in an axial direction (A) and having a first connection face (111);

a second section (120) extending in the axial direction (A) and having a second connection face (121);

a bonding body (130) located between the first connection face (111) and the second connection face (121) and configured to integrally connect the first connection face (111) and the second connection face (121);

wherein at least one of the first connection face (111) and the second connection face (121) comprises: a tapered first surface (131) formed from an outer surface (101) and a second surface (132) formed from an inner surface (102) extending in a radial direction (R), the first segment (110), the second segment (120), and the weld body (130) collectively defining a cavity (140), the cavity (140) having a stop face (141), the first surface (131) and the second surface (132) being positioned proximate the stop face (141); and is provided with

Wherein a ratio of a first diameter (Dn) of a circle formed in an axial direction by an intersection of the first surface (131) and the second surface (132) to a second diameter (OD) of the outer surface (101) is between 0.86 and 0.95.

2. The core tube assembly defined in claim 1 wherein the cavity (140) is configured for receiving a moving iron (200).

3. The core tube assembly according to claim 1, characterized in that the other of the first connection face (111) and the second connection face (121) comprises: a tapered third surface (133) formed starting from the outer surface (101), and the third surface (133) extends all the way from the outer surface (101) to the inner surface (102).

4. The core tube assembly defined in claim 1 wherein a wall (150) is formed between the outer surface (101) and the inner surface (102), the wall (150) having a first thickness (T1) in the radial direction (R).

5. The core tube assembly of claim 4, characterized in that the second surface (132) has a second thickness (T2) in the radial direction (R), the second thickness (T2) being dimensioned between 0.05 and 0.7 times the first thickness (T1).

6. The core tube assembly of claim 1 wherein the cavity (140) extends through the second section (120) and the stop end face (141) is located at the first section (110); the stop end surface (141) is spaced from the second surface (132) along the axial direction (A) by a first distance (D1), the first distance (D1) being between 1.75mm and 2.15 mm.

7. The core tube assembly according to any of the claims 1 to 6, characterized in that the weld body (130) is formed by means of a braze welding between the first joint face (111) and the second joint face (121).

8. The core tube assembly according to any of the claims 1 to 6 characterized in that at the first connection face (111) and the second connection face (121) the outer surface (101) is configured to be cylindrical and has a diameter in axial cross section between 17.5mm and 18.5 mm.

9. A valve, comprising:

a valve body (10);

the core tube assembly (100) as claimed in any one of claims 1 to 8 attached to the valve body (10);

a coil sleeved on the core tube assembly (100); and

a nut (30) attached to the core tube assembly (100) and fixing the coil in position relative to the core tube assembly (100).

10. Valve according to claim 9, characterized in that the valve (1) is a solenoid directional valve.