Durable corrosion-resistant cast iron valve rod

Abstract

The utility model discloses a durable corrosion-resistant cast iron valve rod which comprises a cast iron valve rod body, and a first installation hole is formed in the lower side of the interior of the cast iron valve rod body. The fixing block is fixedly mounted on the outer side of the upper end of the cast iron valve rod body, a second mounting hole is formed in the outer side of the middle of the connecting gland, and a sealing ring is connected to the outer side of the lower end of the connecting gland; the connecting fixing rod is installed on the middle side of the upper end of the cast iron valve rod body, a hand wheel ring is connected to the outer side of the upper end of the connecting fixing rod, a limiting block is connected to the outer side of the lower end of the connecting fixing rod, and a connecting rod is fixedly installed on the outer side of the lower end of the limiting block; the cast iron valve rod body comprises a cast iron material layer, a nickel-chromium alloy layer, a chromium carbide layer, a crosslinked polyethylene layer, a polyurethane layer and a steel wire layer. According to the durable corrosion-resistant cast iron valve rod, the cast iron valve rod can be conveniently assembled, the durable effect of the cast iron valve rod can be conveniently improved, and therefore the service life of the cast iron valve rod is prolonged, and the cast iron valve rod can be conveniently subjected to corrosion resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of cast iron valve stems, in particular to a durable and corrosion-resistant cast iron valve stem. Background Art

[0002] A cast iron valve stem is a valve stem made of cast iron material and is an important component of a valve for transmission. It is connected to an actuator or a handle at the upper end and directly drives a valve core to move or rotate at the lower end to achieve the opening, closing or regulating function of the valve. Cast iron valve stems are widely used, including but not limited to cast iron gate valves and cast iron butterfly valves, etc. These valves are widely used in industries such as petroleum, chemical, pharmaceutical, and electric power. During the use of a cast iron valve stem, a corrosion-resistant structure is required to improve the use effect of the cast iron valve stem. For example:

[0003] Chinese Patent Authorization Publication No. CN209557778U discloses a valve stem with high durability and flexibility, including a valve stem outer body. A valve stem adjusting core is arranged on one outer surface of the valve stem outer body. A connecting rod is fixedly installed in the middle of the valve stem outer body. A fixing core is fixedly installed on one outer surface of one end of the valve stem outer body. Adjusting grooves are formed on the outer surface around the upper end of the valve stem adjusting core. Sliding grooves are formed on the outer surfaces of both sides inside the adjusting grooves. Bearings are arranged on the outer surface around the lower end of the valve stem adjusting core. Sliders are fixedly installed on the outer surfaces of the bearings. A spring is fixedly installed on one outer surface of one end of the fixing core. A wear-resistant layer is arranged on the inner outer surface of the valve stem outer body. The valve stem with high durability and flexibility of the present utility model can improve the service life of the valve stem, improve the environmental adaptability of the valve stem at the same time, facilitate changing the specifications of the valve stem, improve flexibility, and bring better application prospects.

[0004] The above-mentioned prior art solutions have the following defects:

[0005] 1. To improve the durability effect of the valve stem, a fiber filling layer is set to improve the durability effect. During actual use, by increasing the fiber filling layer in the fiber filling layer, the degree of increase in its strength is relatively low.

[0006] 2. The corrosion resistance effect of a common cast iron valve stem is not good, thus affecting the service life of the cast iron valve stem.

[0007] 3. The assembly of the cast iron valve stem is not convenient enough. Therefore, the present utility model provides a durable and corrosion-resistant cast iron valve stem to solve the above-mentioned problems. Content of the Utility Model

[0008] The purpose of the present utility model is to provide a durable and corrosion-resistant cast iron valve stem, so as to solve the problems proposed in the above background technology. That is, to improve the durability of the valve stem by setting a fiber filling layer. In the actual use process, the strength of the fiber filling layer is increased, but the degree of strength increase is relatively low. The corrosion resistance of ordinary cast iron valve stems is not good, which affects the service life of the cast iron valve stem, and the assembly of the cast iron valve stem is not convenient enough.

[0009] To achieve the above purpose, the present utility model provides the following technical solutions: A durable and corrosion-resistant cast iron valve stem, including a cast iron valve stem body, with a first installation hole opened in the lower side of its interior;

[0010] It further includes:

[0011] A fixed block, which is fixedly installed on the outer side of the upper end of the cast iron valve stem body, and a connection pressing cover is connected to the upper side of the fixed block. A second installation hole is opened in the outer side of the middle part of the connection pressing cover, and a sealing ring is connected to the outer side of the lower end of the connection pressing cover;

[0012] A connection fixing rod, which is installed in the middle side of the upper end of the cast iron valve stem body, and a handwheel ring is connected to the outer side of the upper end of the connection fixing rod. A limiting block is connected to the outer side of the lower end of the connection fixing rod, and a connecting rod is fixedly installed on the outer side of the lower end of the limiting block.

[0013] Preferably, the cast iron valve stem body includes a cast iron material layer, a nickel-chromium alloy layer, a chromium carbide layer, a cross-linked polyethylene layer, a polyurethane layer and a steel wire layer. The nickel-chromium alloy layer is connected to the inner side of the cast iron material layer, the chromium carbide layer is installed on the inner side of the nickel-chromium alloy layer, the cross-linked polyethylene layer is connected to the inner side of the chromium carbide layer, the polyurethane layer is installed on the inner side of the cross-linked polyethylene layer, the steel wire layer is connected to the inner side of the polyurethane layer, the glass fiber layer is connected to the inner side of the steel wire layer, and a steel core is arranged on the inner side of the glass fiber layer.

[0014] Preferably, the chromium carbide layer and the polyurethane layer are symmetrically distributed about the center line of the cross-linked polyethylene layer.

[0015] Preferably, the inner side of the steel wire layer is a grid structure and plays a role in increasing the strength of the cast iron valve stem body.

[0016] Preferably, the handwheel ring is connected to the connection fixing rod by means of a thread, and a support block is arranged on the inner side of the handwheel ring.

[0017] Preferably, the connection pressing cover is connected to the fixed block by means of fitting, and the connection pressing cover is connected to the sealing ring by means of clamping.

[0018] Preferably, the connection pressing cover is connected to the connecting rod by means of sliding, and a groove structure is opened in the inner side of the upper end of the connection pressing cover.

[0019] Preferably, the limiting block and the connecting fixing rod are connected by a threaded manner, and the inner vertical cross-sectional shape of the limiting block is an inverted "T" shaped structure.

[0020] Compared with the prior art, the beneficial effects of the present utility model are: the durable and corrosion-resistant cast iron valve stem is convenient for assembling the cast iron valve stem, convenient for improving the durability of the cast iron valve stem, thereby improving the service life of the cast iron valve stem, and convenient for making the cast iron valve stem corrosion-resistant;

[0021] 1. By installing the connecting gland on the outer side of the upper end of the cast iron valve stem body, making the connecting gland fit and connect on the upper side of the fixing block, rotating the limiting block, making the limiting block threadedly connect on the outer side of the connecting fixing rod, so that the limiting block is snap-connected on the outer side of the upper end of the cast iron valve stem body, and then making the limiting block drive the connecting rod to slide on the inner side of the upper end of the connecting gland, making the limiting block limit the connecting gland, and then rotating the handwheel ring, making the handwheel ring threadedly connect on the outer side of the upper end of the connecting fixing rod, which is convenient for assembling between the handwheel ring, the connecting gland and the cast iron valve stem body;

[0022] 2. By providing a cast iron material layer and a steel core, it is beneficial to improve the strength of the cast iron valve stem body, thereby improving the durability of the cast iron valve stem body. Furthermore, through the steel wire layer and the fiberglass layer connected inside the polyurethane layer, it is beneficial to further improve the strength of the cast iron valve stem body;

[0023] 3. By providing a nickel-chromium alloy layer and a chromium carbide layer, it is beneficial to improve the corrosion resistance of the cast iron valve stem body. Furthermore, through the crosslinked polyethylene layer and the polyurethane layer connected inside the chromium carbide layer, it is beneficial to further improve the corrosion resistance of the cast iron valve stem body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional structure diagram of the connection of the cast iron valve stem body of the present utility model and the first installation hole;

[0025] Figure 2 For the present utility model Figure 1 The enlarged structure diagram at A in;

[0026] Figure 3 It is a schematic overall structure diagram of the cast iron valve stem body of the present utility model;

[0027] Figure 4 It is an exploded structure diagram of the connection of the connecting gland of the present utility model and the second installation hole.

[0028] In the figure: 1. Cast iron valve stem body; 101. Cast iron material layer; 102. Nickel-chromium alloy layer; 103. Chromium carbide layer; 104. Cross-linked polyethylene layer; 105. Polyurethane layer; 106. Steel wire layer; 107. Glass fiber layer; 108. Steel core; 2. First installation hole; 3. Connecting and fixing rod; 4. Handwheel ring; 5. Connecting gland; 6. Limiting block; 7. Fixed block; 8. Sealing ring; 9. Second installation hole; 10. Connecting rod. Detailed implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1-4 , the present invention provides a technical solution: a durable and corrosion-resistant cast iron valve stem, including a first installation hole 2 opened in the lower side inside the cast iron valve stem body 1, a fixed block 7 fixedly installed on the outer side of the upper end of the cast iron valve stem body 1, and a connecting gland 5 connected to the upper side of the fixed block 7. A second installation hole 9 is opened on the outer side of the middle part of the connecting gland 5, and a sealing ring 8 is connected to the outer side of the lower end of the connecting gland 5. A connecting and fixing rod 3 is installed in the middle side of the upper end of the cast iron valve stem body 1, and a handwheel ring 4 is connected to the outer side of the upper end of the connecting and fixing rod 3. A limiting block 6 is connected to the outer side of the lower end of the connecting and fixing rod 3, and a connecting rod 10 is fixedly installed on the outer side of the lower end of the limiting block 6. Install the connecting gland 5 on the outer side of the upper end of the cast iron valve stem body 1 so that the connecting gland 5 is connected on the upper side of the fixed block 7. Rotate the limiting block 6 so that the limiting block 6 is connected on the outer side of the connecting and fixing rod 3, so that the limiting block 6 is connected on the outer side of the upper end of the cast iron valve stem body 1, and then the limiting block 6 drives the connecting rod 10 to slide inside the upper end of the connecting gland 5, so that the limiting block 6 limits the connecting gland 5. Then rotate the handwheel ring 4 so that the handwheel ring 4 is connected on the outer side of the upper end of the connecting and fixing rod 3, which is convenient for assembling between the handwheel ring 4, the connecting gland 5 and the cast iron valve stem body 1. Then, through the first installation hole 2 opened on the front side of the lower end of the cast iron valve stem body 1, it is convenient to assemble the cast iron valve stem body 1 and the valve core. Through the second installation hole 9 opened on the outer side of the connecting gland 5, it is convenient to connect and install the connecting gland 5 and the valve body through bolts.

[0031] When using this durable and corrosion-resistant cast iron valve stem, specifically, such as Figure 1 , Figure 2 and Figure 4In it, the connecting gland 5 is installed on the outer side of the upper end of the cast iron valve stem body 1. The connecting gland 5 and the fixed block 7 are connected in a fitting manner, and the connecting gland 5 and the sealing ring 8 are connected in a clamping manner, so that the connecting gland 5 is connected in a fitting manner on the upper side of the fixed block 7. Rotate the limiting block 6. The limiting block 6 and the connecting and fixing rod 3 are connected in a threaded manner, and the inner vertical cross-sectional shape of the limiting block 6 is an inverted "T" - shaped structure, so that the limiting block 6 is threadedly connected on the outer side of the connecting and fixing rod 3, thereby enabling the limiting block 6 to be clamped and connected on the outer side of the upper end of the cast iron valve stem body 1. The connecting gland 5 and the connecting rod 10 are connected in a sliding manner, and a groove structure is provided on the inner side of the upper end of the connecting gland 5. Furthermore, the limiting block 6 drives the connecting rod 10 to slide on the inner side of the upper end of the connecting gland 5, enabling the limiting block 6 to limit the connecting gland 5. The handwheel ring 4 and the connecting and fixing rod 3 are connected in a threaded manner, and a support block is provided on the inner side of the handwheel ring 4. Then rotate the handwheel ring 4, so that the handwheel ring 4 is threadedly connected on the outer side of the upper end of the connecting and fixing rod 3, which is convenient for assembling the handwheel ring 4, the connecting gland 5 and the cast iron valve stem body 1. Then, through the first installation hole 2 provided on the front side of the lower end of the cast iron valve stem body 1, it is convenient to assemble the cast iron valve stem body 1 and the valve core. Through the second installation hole 9 provided on the outer side of the connecting gland 5, it is convenient to connect and install the connecting gland 5 and the valve body through bolts;

[0032] Specifically, as shown in Figure 1 and Figure 3 In it, by providing a cast iron material layer 101 and a steel core 108, it is beneficial to improve the strength of the cast iron valve stem body 1, thereby improving the durability effect of the cast iron valve stem body 1. The inner side of the steel wire layer 106 is a grid structure and plays a role in increasing the strength of the cast iron valve stem body 1. Then, through the steel wire layer 106 and the glass fiber layer 107 connected to the inner side of the polyurethane layer 105, it is beneficial to further improve the strength of the cast iron valve stem body 1;

[0033] Specifically, as shown in Figure 1 and Figure 3 In it, by providing a nickel - chromium alloy layer 102 and a chromium carbide layer 103, it is beneficial to improve the corrosion resistance effect of the cast iron valve stem body 1. The chromium carbide layer 103 and the polyurethane layer 105 are symmetrically distributed about the center line of the cross - linked polyethylene layer 104. Then, through the cross - linked polyethylene layer 104 and the polyurethane layer 105 connected to the inner side of the chromium carbide layer 103, it is beneficial to further improve the corrosion resistance effect of the cast iron valve stem body 1.

[0034] All the standard parts used in the present utility model can be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt the conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0035] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A durable and corrosion-resistant cast iron valve stem, comprising a cast iron valve stem body (1), the lower side of which is provided with a first mounting hole (2); It is characterized in that Also includes: A fixed block (7) is fixedly mounted on the outer side of the upper end of the cast iron valve stem body (1), and the upper side of the fixed block (7) is connected to a connecting gland (5), a second mounting hole (9) is opened on the outer side of the middle part of the connecting gland (5), and a sealing ring (8) is connected to the outer side of the lower end of the connecting gland (5); A connecting and fixing rod (3) is installed on the middle side of the upper end of the cast iron valve stem body (1), and a hand wheel ring (4) is connected to the outer side of the upper end of the connecting and fixing rod (3), and a limit block (6) is connected to the outer side of the lower end of the connecting and fixing rod (3), and a connecting rod (10) is fixedly installed on the outer side of the lower end of the limit block (6).

2. A durable and corrosion-resistant cast iron valve stem according to claim 1, characterized in that: The cast iron valve stem body (1) comprises a cast iron material layer (101), a nickel-chromium alloy layer (102), a chromium carbide layer (103), a cross-linked polyethylene layer (104), a polyurethane layer (105) and a steel wire layer (106), wherein the inner side of the cast iron material layer (101) is connected to the nickel-chromium alloy layer (102), the inner side of the nickel-chromium alloy layer (102) is provided with a chromium carbide layer (103), the inner side of the chromium carbide layer (103) is connected to the cross-linked polyethylene layer (104), the inner side of the cross-linked polyethylene layer (104) is provided with a polyurethane layer (105), the inner side of the polyurethane layer (105) is connected to the steel wire layer (106), the inner side of the steel wire layer (106) is connected to a glass fiber layer (107), and the inner side of the glass fiber layer (107) is provided with a steel core (108).

3. A durable and corrosion-resistant cast iron valve stem according to claim 2, characterized in that: The chromium carbide layer (103) and the polyurethane layer (105) are symmetrically distributed about the center line of the cross-linked polyethylene layer (104).

4. A durable and corrosion-resistant cast iron valve stem according to claim 2, characterized in that: The inner side of the steel wire layer (106) is a grid structure and increases the strength of the cast iron valve stem body (1).

5. A durable and corrosion-resistant cast iron valve stem according to claim 1, characterized in that: The hand wheel ring (4) is connected to the connecting fixing rod (3) in a threaded manner, and a support block is arranged on the inner side of the hand wheel ring (4).

6. A durable and corrosion-resistant cast iron valve stem according to claim 1, characterized in that: The connecting gland (5) and the fixing block (7) are connected in a fitting manner, and the connecting gland (5) and the sealing ring (8) are connected in a snap-fit ​​manner.

7. A durable and corrosion-resistant cast iron valve stem according to claim 1, characterized in that: The connecting cover (5) and the connecting rod (10) are connected in a sliding manner, and a groove structure is provided on the inner side of the upper end of the connecting cover (5).

8. The durable and corrosion-resistant cast iron valve stem according to claim 1, characterized in that: The limit block (6) is connected to the connecting and fixing rod (3) by means of a thread, and the inner vertical cross-section of the limit block (6) is in an inverted "T"-shaped structure.

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