Loose joint type stainless steel ball valve

Abstract

The utility model provides a loose joint type stainless steel ball valve, and belongs to the technical field of valves. The problems that the production efficiency is low and the quality is not stable when the pipe fitting can be connected with the PPR pipe fitting are solved. A ball core and a valve rod are arranged in the valve body, the valve body comprises a body and a rod sleeve, the body is in a circular tube shape and is made of a stainless steel tube, a through hole is formed in the side portion of the body, the inner end of the rod sleeve is fixedly connected to the side portion of the body in a welded mode, the through hole is located in the inner side of the rod sleeve, and the valve rod penetrates through the rod sleeve through the through hole. The two ends of the body are contracted to form connecting sections respectively, the ball core is located in the body, valve seats are arranged between the two contracted positions in the body and the ball core in an abutting mode respectively, annular connectors are fixedly connected to the outer portions of the connecting sections in a welded mode, one end of the connecting pipe abuts against the connectors, and the locking nuts are connected to the outer portions of the connectors in a threaded mode. The method has the advantages of high production efficiency, easiness in batch production, more stable quality and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve technical field relates to a kind of loose joint type stainless steel ball valve. BACKGROUND

[0002] Traditional ball valve is provided with external thread or internal thread, so that it can be conveniently connected with metal pipe fittings. However, PPR pipe fittings are often used in practice, which cannot be connected by threads. Therefore, PPR ball valves appear on the market. For example, a double loose joint ball valve structure disclosed in patent application No. 202120203910.5 includes a valve body, a ball body rotatably arranged in the valve body, a valve stem fixedly arranged on the ball body, a handle arranged on the upper end of the valve stem, locking nuts threadedly connected to the outer sides of the left and right ends of the valve body, loose pipes arranged on the inner sides of the locking nuts, a stop ring arranged on the side of the locking nut away from the ball body, one end of the loose pipe extending out of the locking nut, the other end of the loose pipe being provided with an annular shoulder adapted to the stop ring, the annular shoulder being fixed to the valve body by the locking nut, the end of the annular shoulder facing the ball body being provided with a convex ring, a sealing ring being arranged between the valve body and the convex ring, an inclined surface one being arranged on the sealing ring, an inclined surface two being arranged on the valve body and adapted to the inclined surface one, and the two loose pipes being PPR pipes. When connecting, the end of the PPR pipe fitting is heat-fused and inserted into the loose pipe to fix the two together.

[0003] Generally, the valve body is made of brass, but as the price of copper continues to rise, if the wall thickness of the valve body is thinned to reduce costs, the valve body is prone to breakage. Therefore, people began to use stainless steel material to produce valve body, which has lower price than brass material while ensuring strength. However, unlike brass material which is easy to machine, the valve body made of stainless steel material can only be produced by traditional casting process, so there are problems such as low production efficiency (many processes, including molding, core making, box closing, opening and cleaning, etc.), unstable quality (easily having pores, sand holes, etc.). UTILITY MODEL CONTENTS

[0004] The utility model aims at the above-mentioned problems existing in the prior art, and provides a loose joint type stainless steel ball valve, which solves the problems of low production efficiency and unstable quality when connecting with PPR pipe fittings.

[0005] The utility model can be realized by the following technical solutions:

[0006] The utility model provides a kind of live joint type stainless steel ball valve, including valve body, connecting pipe and locking nut, the valve body is equipped with ball core and valve stem, it is characterized in that, the valve body includes body and shaft sleeve, body is circular tube and is stainless steel pipe material, the side of body is equipped with through hole, the inner end of shaft sleeve is welded and is fixedly connected to the side of body and through hole is located in the inside of shaft sleeve, valve stem passes through the through hole and passes through shaft sleeve, the both ends of body are respectively contracted to form connecting section, ball core is located in body and the both ends of body are respectively abutted with ball core and are equipped with valve seat, annular connecting head is welded and is fixedly connected to the outside of connecting section, one end of connecting pipe is abutted with connecting head, and locking nut is threadedly connected to the outside of connecting head.

[0007] When manufacturing, a section of stainless steel pipe material is cut off as body (the side of body is processed with through hole) and shaft sleeve is processed according to design length, ball core is placed into body, and valve seat is placed into the both ends of body and is abutted with ball core, then the both ends of body are simultaneously contracted to form connecting section. After contraction, the both ends of body are respectively abutted with two valve seats, so that two valve seats and ball core are fixed between the both ends of body. Then, the inner end of valve stem is connected with ball core through the through hole of the side of body, shaft sleeve is sleeved on the outside of valve stem, the outer end of shaft sleeve is abutted with the side of body, and the both are fixed by welding. Finally, connecting head is sleeved on the outside of connecting section through the center hole of matching convex edge, and the both are fixed by welding, then connecting pipe and locking nut are connected on connecting head.

[0008] By setting valve body as including body and shaft sleeve, body is circular tube and is stainless steel pipe material, the both ends of body are directly contracted to complete the positioning of ball core in production, and the part for valve stem is formed by welding and fixedly connecting shaft sleeve to the side of body, and connecting head is annularly welded and fixedly connected to the outside of connecting section to be matched with locking nut and connecting pipe, so that the live joint type stainless steel ball valve can be connected with PPR pipe fitting, and the production mode of casting is avoided, mass production is easier, quality is more stable, and product qualification rate is higher.

[0009] In the above-mentioned live joint type stainless steel ball valve, the inside of one end of connecting head close to ball core is provided with annular matching convex edge in circumferential direction, the outer surface of connecting section is cylindrical surface, and connecting section is inserted into the center hole of matching convex edge.

[0010] The outer surface of connecting section after contraction is cylindrical surface, and annular matching convex edge is provided in circumferential direction on the inside of one end of connecting head close to ball core, and connecting section is inserted into the center hole of matching convex edge, which can ensure that connecting head is coaxially arranged with body, so that connecting pipe can be coaxially arranged with body.

[0011] In the above-mentioned loose type stainless steel ball valve, the side of the matching protrusion close to the ball core is provided with a positioning step, and the end of the connecting section abuts against the positioning step.

[0012] By arranging the positioning step on the side of the protrusion close to the ball core, the matching depth of the connecting section and the connecting head can be well controlled by abutting the end of the connecting section against the positioning step during assembly, and the connecting head can be prevented from being deviated during welding, and the symmetry of the two connecting heads can be better ensured.

[0013] In the above-mentioned loose type stainless steel ball valve, the inner end of the rod sleeve has a matching surface, the matching surface is arranged in a cylindrical curved surface around the body center line, the matching surface abuts against the outer side wall of the body, and the through hole is located on the inner side of the rod sleeve.

[0014] The body is in a circular tube shape, and the outer surface is a cylindrical surface. By arranging the matching surface in a cylindrical curved surface around the body center line at the inner end of the rod sleeve, the matching surface can be fitted on the outer side wall of the body, so that there is almost no gap between them, thereby ensuring the strength and sealing performance after welding.

[0015] In the above-mentioned loose type stainless steel ball valve, the outer end of the valve stem extends out of the rod sleeve and is connected with a handle, the handle has a sleeving part, the sleeving part is provided with a sleeving hole, the handle is sleeved on the outer end of the rod sleeve through the sleeving hole, a square insertion hole is arranged at the top wall of the sleeving hole, the outer end of the valve stem is square and is inserted into the insertion hole, the handle and the rod sleeve are axially clamped and fixed, and the handle can rotate relative to the rod sleeve, the outer end of the rod sleeve protrudes and is provided with a stop block, the hole wall of the sleeving hole protrudes and is provided with two limiting blocks, the two limiting blocks are distributed in the circumferential direction, and the stop block is located between the two limiting blocks.

[0016] After the rod sleeve inner end and the body are welded and fixed together, the outer end of the valve stem extends out of the rod sleeve, at this time, the handle is sleeved on the outer end of the rod sleeve through the sleeving hole of the sleeving part, the outer end of the valve stem is inserted into the insertion hole arranged at the top wall of the sleeving hole to form circumferential fixation of the valve stem and the handle, and the handle and the rod sleeve are axially clamped and fixed together and the handle can rotate relative to the rod sleeve, thereby realizing the cooperation of the handle and the valve stem and the axial fixation of the handle. After the connection of the handle is completed, the stop block is located between the two limiting blocks to limit the rotation angle of the valve stem from opening to closing of the ball valve. Compared with the prior art that the handle is directly sleeved on the outer end of the valve stem to form circumferential fixation and then a nut is used to axially fix the handle and the valve stem together, the handle in the loose ball valve adopts such a connection mode, which can realize rapid assembly and omit the use of the nut.

[0017] In the above-mentioned articulated stainless steel ball valve, the outer end side of the rod sleeve has an annular clamping groove, the handle is a plastic part, two notched grooves are provided through the radial direction of the sleeve hole in the side of the sleeve part, a clamping part in the form of a sheet is formed between the two notched grooves, and the inner side of the clamping part has a clamping protrusion which is clamped in the annular clamping groove.

[0018] The provision of the two notched grooves through the radial direction of the sleeve hole in the side of the sleeve part causes the sleeve part to form a clamping part in the form of a sheet between the two notched grooves. This sheet-like form has a certain elasticity, similar to the structure of a spring. Thus, during the process of sleeving the sleeve part to the outer end of the rod sleeve, the clamping protrusion will first come into contact with the side wall of the outer end of the rod sleeve, causing the clamping part to be extruded outward and deformed, until the clamping protrusion reaches the position of the annular clamping groove. Under the action of the elastic force of the clamping part itself, the clamping protrusion is clamped into the annular clamping groove, thereby causing the handle to be clamped and fixed with the rod sleeve in the axial direction, and enabling the handle to rotate relative to the rod sleeve.

[0019] In the above-mentioned articulated stainless steel ball valve, as another technical solution, the outer end of the valve rod protrudes out of the rod sleeve and is fixedly connected with a handle, the outer end side of the rod sleeve protrudes in the circumferential direction and is provided with two limiting lugs, and the handle has an abutting part located between the two limiting lugs.

[0020] In the above-mentioned articulated stainless steel ball valve, the opposite sides of the two valve seats are each provided with a recessed annular positioning seat, and the two annular positioning seats are each provided with a sealing gasket, and the two sealing gaskets are abuttingly arranged on the two sides of the ball core.

[0021] Compared with the prior art, the articulated stainless steel ball valve directly shrinks the two ends of the body to complete the positioning of the ball core during production, and forms a part for the valve rod to pass through by welding the rod sleeve to the side of the body. In addition, a connecting head in the form of a ring is welded and fixed to the connecting section to be matched with the lock nut and the connecting pipe. Thus, the articulated stainless steel ball valve can be connected with the PPR pipe fitting while avoiding the production mode of casting, and is easier to mass-produce and has more stable quality. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of the articulated stainless steel ball valve.

[0023] Figure 2 is a sectional view of the articulated stainless steel ball valve in Example 1.

[0024] Figure 3 is Figure 2 is an enlarged view of the connecting section and the connecting pipe in

[0025] Figure 4 isFigure 2 is a sectional view along the direction of A-A.

[0026] Figure 5 is Figure 2 is a sectional view along the direction of B-B.

[0027] Figure 6 is a perspective view of the valve body.

[0028] Figure 7 is a perspective view of the handle.

[0029] Figure 8 is an enlarged view of the connection section and the connecting pipe in Example 2.

[0030] In the figure, 1, valve body; 1a, body; 1a1, connection section; 1a2, through hole; 1b, rod sleeve; 1b1, matching surface; 1b2, limiting stop shoulder; 1b3, stop block; 1b4, annular clamping groove; 2, ball core; 3, valve rod; 3a, annular convex part; 4, valve seat; 5, sealing washer; 6, locking nut; 6a, stop ring; 7, connecting pipe; 7a, annular convex shoulder; 8, connecting head; 8a, matching convex edge; 8a1, positioning step; 9, handle; 9a, sleeving part; 9a1, sleeving hole; 9a2, insertion hole; 9a3, limiting block; 9a4, notched groove; 9a5, clamping part; 9a51, clamping convex edge; 10, sealing ring. DETAILED DESCRIPTION

[0031] The following is a specific embodiment of the present application and further describes the technical solution of the present application in combination with the accompanying drawings, but the present application is not limited to these embodiments.

[0032] Example 1

[0033] As Figure 1 , Figure 2 and Figure 4As shown in the figure, a kind of loose type stainless steel ball valve, including valve body 1, ball core 2 and valve stem 3 are provided in valve body 1.Valve body 1 includes the body 1a of circular tube and the sleeve 1b of stem, the sleeve 1b of stem is cylindrical and has inner hole, the inner end of sleeve 1b of stem is welded and fixedly connected to the side of body 1a, and body 1a is specifically stainless steel pipe material, valve stem 3 is arranged in sleeve 1b of stem, and the inner end of valve stem 3 extends into body 1a and is connected with ball core 2.Body 1a is respectively contracted at both ends to form connecting section 1a1, ball core 2 is located in body 1a and is located between the two contraction positions of body 1a, and valve seat 4 is respectively arranged in abutment between body 1a and ball core 2 at the two contraction positions of body 1a.Wherein, the side of body 1a is provided with through hole 1a2, valve stem 3 passes through through hole 1a2, the inner end of sleeve 1b of stem has matching surface 1b1, matching surface 1b1 is arranged as cylindrical surface around the center line of body 1a, matching surface 1b1 is in abutment with the outer side wall of body 1a, and through hole 1a2 is located on the inner side of sleeve 1b of stem.The inner side of the inner end of sleeve 1b of stem is provided with limit stop shoulder 1b2, the outer side of valve stem 3 has annular protrusion 3a, limit stop shoulder 1b2 and annular protrusion 3a are in abutment to limit valve stem 3 in sleeve 1b of stem in axial direction.Both valve seats 4 are provided with recessed annular positioning seat on opposite side, both annular positioning seats are provided with sealing gasket 5, and both sealing gaskets 5 are arranged in abutment on both sides of ball core 2.

[0034] Further, as shown in Figure 2 、 Figure 3 and Figure 6 , the ball valve also includes locking nut 6 and connecting pipe 7, connecting pipe 7 is PPR connecting pipe, locking nut 6 is sleeved outside connecting pipe 7, connecting section 1a1 is welded and fixedly connected with annular connector 8 outside, one end of connecting pipe 7 is in abutment with connector 8, and locking nut 6 is threadedly connected outside connector 8.Specifically, the inner side of the end of connector 8 closer to ball core 2 is provided with annular matching protruding edge 8a in circumferential direction, the outer surface of connecting section 1a1 is cylindrical surface, and connecting section 1a1 is inserted into the center hole of matching protruding edge 8a.The same as the improved double-loose type ball valve structure in the background art is that, in the embodiment, the inner side of locking nut 6 is also provided with stop ring 6a, and the outer side of connecting pipe 7 is also provided with annular shoulder 7a, so that connecting pipe 7 cannot directly come out of locking nut 6 by abutment of stop ring 6a and annular shoulder 7a.Sealing ring 10 is sleeved outside the outer side of one end of connecting pipe 7 in abutment with connector 8, and sealing ring 10 is in abutment with the inner wall of connector 8 to form sealing.

[0035] In the manufacturing process, a section of stainless steel pipe is first cut to the designed length as the body 1a (the side of the body 1a is processed with the through hole 1a2) and the shaft sleeve is processed. The ball core 2 is placed into the body 1a, and the valve seats 4 are placed into the body 1a from both ends and abut against both sides of the ball core 2. Then the two ends of the body 1a are simultaneously shrunk to form the connecting section 1a1. After the completion of the shrinking, the two shrunk positions are respectively abutted against the two valve seats 4, so that the two valve seats 4 and the ball core 2 are fixed axially between the two shrunk positions. Then the inner end of the valve stem 3 is connected with the ball core 2 through the through hole 1a2 of the side of the body 1a, and then the stem sleeve 1b is sleeved on the outer side of the valve stem 3 to the outer end of the stem sleeve 1b abutting against the side of the body 1a, and then the two are fixed together by welding. The inner end of the stem sleeve 1b is provided with a matching surface 1b1, which is a cylindrical curved surface arranged around the center line of the body 1a. Such a shape makes the matching surface 1b1 fit on the outer side wall of the body 1a, so that there is almost no gap between the two, thereby ensuring the strength and sealing performance after welding. Finally, the connecting head 8 is sleeved on the outside of the connecting section 1a1 through the center hole of the matching convex edge 8a, and the two are fixed together by welding, and then the connection of the connecting pipe 7 and the locking nut 6 on the connecting head 8 is completed.

[0036] Further, as Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, the outer end of the valve stem 3 extends out of the sleeve 1b and is connected with a handle 9, the handle 9 being a plastic piece, the handle 9 having a sleeving portion 9a, the sleeving portion 9a being provided with a sleeving hole 9a1, the handle 9 being sleeved on the outer end portion of the sleeve 1b through the sleeving hole 9a1, the top wall of the sleeving hole 9a1 being provided with a square insertion hole 9a2, the outer end of the valve stem 3 being square and inserted into the insertion hole 9a2. The handle 9 is axially clamped and fixed with the sleeve 1b and can rotate relative to the sleeve 1b, the outer end portion of the sleeve 1b being protrusively provided with a stop block 1b3, the hole wall of the sleeving hole 9a1 being protrusively provided with two limiting blocks 9a3, the two limiting blocks 9a3 being distributed in the circumferential direction, the stop block 1b3 being located between the two limiting blocks 9a3. Specifically, the number of the stop blocks 1b3 is two, the stop blocks 1b3 being arranged in the circumferential direction with the limiting blocks 9a3. The outer end side of the sleeve 1b has an annular clamping groove 1b4, the side of the sleeving portion 9a being provided with two notched grooves 9a4 through the radial direction of the sleeving hole 9a1, the sleeving portion 9a forming a clamping portion 9a5 in the form of a sheet between the two notched grooves 9a4, the inner side of the clamping portion 9a5 having a clamping protruding edge 9a51, the clamping protruding edge 9a51 being clamped in the annular clamping groove 1b4. In this embodiment, the number of the clamping portion 9a5 is two. After the inner end of the sleeve 1b and the body 1a are welded and fixed together, the outer end of the valve stem 3 extends out of the sleeve 1b, at this time, the handle 9 is sleeved on the outer end portion of the sleeve 1b through the sleeving hole 9a1 of the sleeving portion 9a, the outer end of the valve stem 3 is inserted into the insertion hole 9a2 opened at the top wall of the sleeving hole 9a1 to make the valve stem 3 and the handle 9 form a circumferential fixation. After the handle 9 is sleeved on the outer end portion of the sleeve 1b, the clamping protruding edge of the clamping portion 9a5 is clamped in the annular clamping groove 1b4 to make the handle 9 and the sleeve 1b be axially fixed together, at the same time, the stop block 1b3 is located between the two limiting blocks 9a3 to constitute a limitation to the rotation angle of the valve stem 3 from the opening to the closing of the ball valve.

[0037] Embodiment Two

[0038] The structure and principle of this embodiment are basically the same as those of Embodiment One, the difference lies in that, in this embodiment, as shown in the figure, the side of the matching protruding edge 8a close to the ball core 2 is provided with a positioning step 8a1, the end portion of the connecting section 1a1 abuts against the positioning step 8a1. Figure 8

[0039] By setting the positioning step 8a1 on the side of the matching protruding edge 8a close to the ball core 2, the matching depth of the connecting section 1a1 and the connecting head 8 can be well controlled by means of the end portion of the connecting section 1a1 abutting against the positioning step 8a1 during assembly and the connecting head 8 can not be deviated during welding, at the same time, the symmetry of the two connecting heads 8 can be better ensured.

[0040] Embodiment Three

[0041] ​The embodiment is basically same as the structure and principle of the embodiment one, and the difference is that in the embodiment, the outer end of the valve rod 3 extends out of the rod sleeve 1b and is fixedly connected with a handle 9, the outer end side of the rod sleeve 1b is provided with two limiting brackets along the circumferential direction, and the handle 9 has an abutting part between the two limiting brackets.

[0042] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A loose joint type stainless steel ball valve comprising a valve body (1), a connecting pipe (7) and a locking nut (6) sleeved outside the connecting pipe (7), the valve body (1) being provided with a ball core (2) and a valve rod (3) therein, characterized in that, The valve body (1) comprises a body (1a) and a rod sleeve (1b), the body (1a) is a circular tube and is made of stainless steel, the side of the body (1a) is provided with a through hole (1a2), the inner end of the rod sleeve (1b) is welded and fixed to the side of the body (1a) and the through hole (1a2) is located inside the rod sleeve (1b), the valve rod (3) passes through the rod sleeve (1b) through the through hole (1a2), the two ends of the body (1a) are respectively contracted to form connecting sections (1a1), the ball core (2) is located in the body (1a) and the ball core (2) is respectively abutted with the valve seat (4) at the two contraction positions in the body (1a), the connecting section (1a1) is externally welded and fixed with a ring-shaped connector (8), the connector (8) is abutted with the connecting pipe (7), and the locking nut (6) is threadedly connected to the outside of the connector (8).

2. The union stainless steel ball valve according to claim 1, wherein, The inner side of the end of the connector (8) close to the ball core (2) is provided with a ring-shaped matching convex edge (8a) in the circumferential direction, the outer surface of the connecting section (1a1) is a cylindrical surface, and the connecting section (1a1) is inserted into the center hole of the matching convex edge (8a).

3. The union stainless steel ball valve according to claim 2, wherein, The side of the matching convex edge (8a) close to the ball core (2) is provided with a positioning step (8a1), and the end of the connecting section (1a1) is abutted on the positioning step (8a1).

4. The union stainless steel ball valve according to claim 1 or 2 or 3, characterized in that, The inner end of the rod sleeve (1b) has a matching surface (1b1), the matching surface (1b1) is provided around the center line of the body (1a) in a cylindrical surface, the matching surface (1b1) is abutted with the outer side wall of the body (1a), and the through hole (1a2) is located inside the rod sleeve (1b).

5. The union stainless steel ball valve according to claim 4, wherein, The outer end of the valve rod (3) extends out of the rod sleeve (1b) and is connected with the handle (9), the handle (9) has a sleeving part (9a), the sleeving part (9a) is provided with a sleeving hole (9a1), the handle (9) is sleeved on the outer end of the rod sleeve (1b) through the sleeving hole (9a1), a square insertion hole (9a2) is arranged at the top wall of the sleeving hole (9a1), the outer end of the valve rod (3) is square and is inserted into the insertion hole (9a2), the handle (9) is axially clamped and fixed with the rod sleeve (1b) and can rotate relative to the rod sleeve (1b), the outer end of the rod sleeve (1b) is protrusively provided with a stop block (1b3), the hole wall of the sleeving hole (9a1) is protrusively provided with two limiting blocks (9a3), the two limiting blocks (9a3) are distributed in the circumferential direction, and the stop block (1b3) is located between the two limiting blocks (9a3).

6. The union stainless steel ball valve according to claim 5, wherein, The outer end side of the rod sleeve (1b) has a ring-shaped clamping groove (1b4), the handle (9) is a plastic part, two notch grooves (9a4) are provided through the radial direction of the sleeving hole (9a1) at the side of the sleeving part (9a), a sheet-shaped clamping part (9a5) is formed between the two notch grooves (9a4), the inner side of the clamping part (9a5) has a clamping convex edge (9a51), and the clamping convex edge (9a51) is clamped in the ring-shaped clamping groove (1b4).

7. The union stainless steel ball valve according to claim 4, wherein, The outer end of the valve rod (3) extends out of the rod sleeve (1b) and is fixedly connected with the handle (9), the outer end side of the rod sleeve (1b) is protrusively provided with two limiting brackets in the circumferential direction, and the handle (9) has an abutting part located between the two limiting brackets.

8. The union stainless steel ball valve according to claim 1 or 2 or 3, wherein, The opposite sides of the two valve seats (4) are provided with recessed annular positioning seats, and the two annular positioning seats are provided with sealing washers (5) abutting against the two sides of the ball core (2).

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