Ball valve

Abstract

The utility model discloses a ball valve which comprises a valve body and a valve cover, a valve element ball is arranged in an inner cavity of the valve body, the left end of the valve cover is installed in the right end of the inner cavity, the portion, entering the inner cavity, of the valve cover is in threaded connection with the valve body, and the abutting end faces of the valve cover and the valve body are welded to form a welding portion. And the welding part is positioned between the valve core ball and the outlet of the valve cover in the axial direction. According to the ball valve, the welding seam part is located at the rear end of the valve element ball by adjusting the position of the welding seam part, when leakage occurs when the welding seam part is damaged, the valve element ball can stop leakage in time, and leakage of a large amount of refrigerants is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially, it relates to a ball valve. BACKGROUND

[0002] Ball valve is mainly used for cutting off or connecting the refrigerant medium in the pipeline. Figure 5 It is the structure diagram of this typical ball valve; Figure 5 Ball valve includes valve body 1', is located on the outlet 11' and the connection inner thread 12' of valve body 1', is welded on the valve stem fixed seat 7' of valve body, the valve cover 2' that is sealed after being connected with valve body 1' by thread again and is implemented by argon arc welding, is located on the inlet 21' and the connection outer thread 22' of valve cover, the valve core ball 5' with through hole being arranged in the inner cavity of valve body 1', the sealing ring 3' that is assembled between valve cover 2' and valve body 1', the valve stem 4' for driving valve core ball 5', the sealing ring 6' that is assembled between valve stem 4' and valve stem fixed seat 7', and the positioning structure for realizing the rotation positioning of valve stem 4' on valve stem fixed seat 7'.During the operation of ball valve, rotate valve stem 4', drive the rotation of valve core ball 5', to realize the cut-off and the conduction of internal fluid.

[0003] The inner thread of the outlet end of the ball valve is sealed after being connected with the safety valve, and the outer thread of the inlet end of the ball valve is vertically sealed and installed with the upward inner thread hole of the liquid tank in the large refrigeration and air conditioning unit, so that the safety valve can be replaced, repaired and maintained, and the refrigerant can be cut off. Because the large unit works with large vibration, the weld seam part of the ball valve, which is the most fragile part, is often cracked due to fatigue failure after the threaded connection of the valve body and the valve cover and the welding, resulting in refrigerant leakage, and the ball valve cannot shut off the leakage. Similarly, the large leakage of refrigerant makes the unit unable to work normally, and the loss is also very large because the refrigerant filled in the large unit is more than several hundred kilograms. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is that the weld seam part is damaged to cause refrigerant leakage in the prior art. The utility model provides a ball valve, which can rotate the valve stem and drive the rotation of the valve core ball when leakage occurs, so that the cut-off and conduction of internal fluid can be realized.

[0005] The utility model discloses a ball valve which solves the technical problems by the technical scheme that a ball valve is composed of a valve body and a valve cover, a valve rod fixing seat is welded on the valve body, the valve cover and the valve body are connected by thread and then sealed welding to form a welding part, the inner cavity of the valve body is provided with a valve core ball with a through hole, a sealing ring is arranged between the valve cover and the valve body, the valve rod fixing seat is provided with a valve rod for driving the valve core ball, the valve core ball is connected with a valve rod driving mechanism, an inlet is arranged on the valve body, the outer wall of the inlet is provided with an external thread, an outlet is arranged on the valve cover, and the inner wall of the outlet is provided with an internal thread.

[0006] The ball valve can also be used for replacing and maintaining the safety valve, cutting off and connecting the refrigerant when the internal thread of the valve cover is connected with the safety valve, and can be immediately shut off to block the refrigerant leakage when the refrigerant leaks due to the fatigue damage and cracking of the welding part of the most fragile part of the ball valve during the installation of the ball valve in a large unit.

[0007] Further, the valve body and the valve cover are made of stainless steel profiles.

[0008] Further, the valve body and the valve cover are made of SUS304 stainless steel material.

[0009] Further, the external thread arranged on the valve body is a conical external thread.

[0010] Further, the internal thread arranged on the valve cover is a cylindrical internal thread.

[0011] Further, the valve rod fixing seat welded on the valve body is made of stainless steel material and is connected with the valve body by tunnel furnace welding with gas protection.

[0012] Further, in order to ensure that the thread can be pre-tightened, the valve cover has a regular hexagonal shape.

[0013] Further, in order to adjust the connection structure of the valve body and the valve cover and change the position of the welding part, the left end of the valve cover has a connecting boss, the front end of the connecting boss enters the inner cavity of the valve body, the outer wall of the connecting boss is threadedly connected with the inner wall of the valve body, the left end surface of the connecting boss abuts against the right end surface of the valve body, and a welding part is formed on the abutting end surface. Adjusting the connection structure of the valve body and the valve cover makes the welding part located between the valve core ball and the outlet of the valve cover, so that the ball valve can be normally shut off when leakage occurs in the welding part, and the refrigerant can be prevented from leaking from the welding part.

[0014] Further, in order to realize the threaded connection of the valve body and the valve cover, the left end of the valve cover is provided with a connecting boss, the front end of the connecting boss enters the inner cavity of the valve body, and the outer wall of the connecting boss is threadedly connected with the inner wall of the valve body, the left end surface of the connecting boss abuts against the right end surface of the valve body, and a welding portion is welded on the abutting end surface.

[0015] Further, the connecting boss comprises a column body and a base connected with the column body, the column body is provided with external threads, the column body enters the inner cavity and is threadedly connected with the inner wall of the valve body, and the base and the valve body are provided with abutting end surfaces and inclined surfaces, the abutting end surfaces of the base and the valve body are in contact, and a welding area is formed between the inclined surfaces of the base and the valve body.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] 1、 the utility model discloses a ball valve, the valve body is provided with an inlet and a connecting external thread, the valve cover is provided with an outlet and a connecting internal thread, the valve cover is threadedly connected with the valve body, and then argon arc welding is carried out to realize that the sealed welding portion is located close to the outlet, when the connecting internal thread is connected with the safety valve and is used, the safety valve can also be replaced, maintained and repaired, and the refrigerant can be cut off and connected, when the ball valve is installed in a large unit and works for a long time, the welding seam of the most fragile part of the ball valve is cracked and disconnected due to fatigue damage, and the refrigerant leaks, the ball valve can be immediately turned off to block the refrigerant leakage. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further explained in connection with the drawings and examples.

[0019] Figure 1 It is the structure schematic diagram of the ball valve of the utility model;

[0020] Figure 2 It is the sectional view of the valve body;

[0021] Figure 3 It is the sectional view of the valve cover;

[0022] Figure 4 It is the external structure schematic diagram of the valve cover;

[0023] Figure 5 It is the structure schematic diagram of the existing ball valve;

[0024] In the drawing: 1, valve body, 11, mounting groove, 12, inner cavity, 13, inlet, 2, valve cover, 21, connecting boss, 211, column body, 212, base, 213, abutting end surface, 214, inclined surface, 3, valve core ball, 4, valve rod fixed seat, 22, outlet, 5, valve rod, 6, sealing ring, 7, welding portion. DETAILED DESCRIPTION

[0025] The utility model will be further described in detail in connection with the drawings. These drawings are all simplified schematic diagrams, and only schematically show the basic structure of the utility model, so they only show the structure related to the utility model.

[0026] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In addition, the features limited by "first" and "second" can be explicitly or implicitly included one or more features. In the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0027] In the description of the utility model, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0028] As Figures 1 to 3 As shown in the figure, a ball valve, including valve body 1 and valve cover 2. The inner cavity 12 of valve body 1 is provided with valve core ball 3. The valve stem fixing seat 4 is welded on the valve body 1, and the valve stem fixing seat 4 is provided with the valve stem 5 connected with the valve core ball 3. The valve body 1 has a mounting groove 11, and the valve stem fixing seat 4 is arranged in the mounting groove 11 and welded with the valve body 1. The valve body 1 and the valve cover 2 are provided with the sealing ring 6 in contact with the valve core ball 3.

[0029] Specifically, the valve body 1, the valve cover 2 and the valve stem fixing seat 4 are all stainless steel materials. Preferably, the valve body and the valve cover are made of SUS304 stainless steel material. The outer wall of the inlet 13 of the valve body 1 is provided with a connecting external thread, and the inner wall of the outlet 22 of the valve cover 2 is provided with a connecting internal thread. The connecting external thread is a conical external thread, and the connecting internal thread is a cylindrical internal thread.

[0030] Specifically, the valve cover 2 is connected with the safety valve through the connecting internal thread, and the valve body 1 is connected with the refrigerating unit through the connecting external thread.

[0031] Specifically, the left end of the bonnet 2 is inserted into the right end of the inner cavity 12, and the part of the bonnet 2 entering the inner cavity 12 is threadedly connected with the valve body 1, and the abutting end face of the bonnet 2 and the valve body 1 is welded to form a welded portion 7. The welded portion 7 is located between the valve core ball 3 and the outlet 22 of the bonnet 2 in the axial direction. Since the installation position of the valve core ball 3 is adjusted in the valve body 1, the welded portion 7 of the valve body 1 and the bonnet 2 can be located between the valve core and the outlet 22 of the bonnet 2. If the welded portion leaks, the valve core ball 3 can still be controlled to move by the valve stem 5, the ball valve is closed, and the leakage of refrigerant at the welded portion is avoided.

[0032] Preferably, the left end of the bonnet 2 has a connecting boss 21, the front end of the connecting boss 21 enters the inner cavity 12 of the valve body 1, and the outer wall of the connecting boss 21 is threadedly connected with the inner wall of the valve body 1. The left end face of the connecting boss 21 abuts against the right end face of the valve body 1, and a welded portion 7 is formed by welding on the abutting end face. The bonnet 2 is threadedly connected with the inner cavity 12 of the valve body 1 through the connecting boss 21, and welding is performed at the abutting portion of the bonnet 2 and the valve body 1.

[0033] Specifically, the connecting boss 21 includes a column body 211 and a base 212 connected with the column body 211. The column body 211 has external threads, and the column body 211 extends into the inner cavity 12 and is threadedly connected with the inner wall of the valve body 1. The base 212 and the valve body 1 have an abutting end face 213 and an inclined surface 214, the abutting end face of the base 212 and the valve body 1 are in contact, and a welding area is formed between the inclined surfaces 214 of the two. The bonnet 2 is threadedly connected on the valve body 1 until the abutting end face of the base 212 and the valve body 1 is in contact, and since there is a gap between the inclined surfaces 214, welding can be performed at this position, thereby realizing the connection between the valve body 1 and the bonnet 2.

[0034] In summary, the ball valve of the present application has the following advantages: the valve body is provided with an inlet and an external thread, the bonnet is provided with an outlet and an internal thread, and the welded portion for sealing after the bonnet and the valve body are threadedly connected is located near the outlet. When the internal thread is connected with the safety valve for installation and use, the safety valve can be replaced and maintained, and the refrigerant can be cut off and connected. When the ball valve is installed in a large unit and works for a long time, the welded portion which is the most fragile part of the ball valve is cracked and disconnected due to fatigue failure, and the refrigerant leaks. The ball valve can be immediately shut off to block the leakage of the refrigerant.

[0035] The above description is based on the ideal embodiment of the present application, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined by the scope of the claims.

Claims

1. A ball valve comprising a valve body (1) and a valve cover (2), a valve rod fixing seat (4) is welded on the valve body (1), the valve cover (2) is sealingly welded after being connected with the valve body (1) by threads to form a welding part, an inner cavity of the valve body (1) is provided with a valve core ball (3) with a through hole, a sealing ring (6) is arranged between the valve cover (2) and the valve body (1), the valve rod fixing seat (4) is provided with a valve rod (5) for driving the valve core ball (3), and the valve core ball (3) is connected with a valve rod driving mechanism, characterized in that: The valve body (1) is provided with an inlet (13), and the outer wall of the inlet (13) is provided with a connecting external thread. ​ 2. The ball valve according to claim 1, characterized in that The valve body (1) and the valve cover (2) are made of stainless steel profiles.

3. The ball valve of claim 2, wherein The valve body (1) and the valve cover (2) are made of SUS304 stainless steel material.

4. The ball valve of claim 1, wherein The connecting external thread is a conical external thread.

5. The ball valve of claim 1, wherein The connecting internal thread is a cylindrical internal thread.

6. The ball valve of claim 1, wherein The valve rod fixing seat (4) is made of stainless steel and is welded to the valve body (1) by a tunnel furnace with gas protection.

7. The ball valve of claim 1, wherein The valve cover (2) has a regular hexagonal shape.

8. A ball valve according to any one of claims 1 to 7, characterised in that The valve cover (2) and the valve body (1) are welded at the abutting end face (213) to form a welding portion (7), and the welding portion (7) is located between the valve core ball (3) and the outlet (22) of the valve cover (2) in the axial direction.

9. The ball valve of claim 8, wherein, The left end of the valve cover (2) has a connecting boss (21), the front end of the connecting boss (21) enters the inner cavity (12) of the valve body (1), and the outer wall of the connecting boss (21) is threadedly connected with the inner wall of the valve body (1), the left end face of the connecting boss (21) abuts against the right end face of the valve body (1), and a welding portion (7) is welded at the abutting end face (213).

10. The ball valve of claim 9, wherein, The connecting boss (21) includes a column body (211) and a base (212) connected with the column body (211), the column body (211) is provided with an external thread, the column body (211) extends into the inner cavity (12) and is threadedly connected with the inner wall of the valve body (1), the base (212) and the valve body (1) are provided with an abutting end face (213) and an inclined surface (214), the abutting end face (213) of the base (212) and the valve body (1) are in contact, and a welding area is formed between the inclined surfaces (214) of the two.

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