Valve with excellent sealing performance

Abstract

The invention relates to a valve with excellent sealing performance, in particular to a valve leakage-proof device for conveying electrolyte of a flow battery, and solves the problem of valve leakage caused by poor sealing performance in the electrolyte conveying process. The leakage position of the valve is mainly from the position between the valve seat and the closing piece, the position between the filler and the valve rod and the tangent position of the valve seat and the ball valve. According to the scheme, a traditional inner sealing device is changed into an outer sealing device, firstly, the outer diameter of a valve body is widened, so that a groove is formed and used for containing a square sealing ring, and double secondary sealing is formed for the valve when a passage is formed; and secondly, a material pressing bin is additionally arranged above the valve body and can be used for placing an O-shaped sealing ring, so that a three-stage sealing device is formed between the valve rod and the valve body, the sealing performance of the valve is improved, and the service life of the valve is prolonged.

Description

Technical Field

[0001] The present invention relates to a valve, in particular to a valve with excellent sealing performance, which is a valve designed for conveying electrolyte of a liquid flow battery, has excellent sealing performance and belongs to the technical field of valves. Background Art

[0002] As an indispensable key component in fluid control systems, the sealing performance of valves is directly related to the safety, reliability and efficiency of the entire system. The development and application of valve technology is not only to meet the growing industrial needs, but also to cope with complex working conditions and ensure the stability and safety of fluid media during transmission.

[0003] The basic principle of valve sealing is to prevent the fluid medium from leaking from potential leakage points such as between the valve seat and the closing member, between the packing and the valve stem, and between the valve body and the valve cover when the valve is closed through a sealing structure with a specific structure. The sealing performance of the liquid mainly depends on the viscosity and surface tension of the liquid. However, due to the gap between the sealing pairs and the pressure difference between the two sides of the sealing pairs, leakage is difficult to avoid. Leakage problems not only lead to the loss of fluid media, but may also cause environmental pollution, equipment damage and even safety accidents. Therefore, the development of valve sealing technology has always revolved around the goal of reducing or eliminating leakage. The existing valve sealing technologies include metal hard seals and rubber soft seals. Metal hard seals have high requirements for manufacturing accuracy and installation accuracy, and the sealing performance is easily affected by working conditions such as temperature and pressure, and there are certain limitations. For the rubber soft seal of the valve, the sealing effects currently available on the market, whether between the packing and the valve stem or between the valve body and the valve cover, are mostly double sealing effects. The first layer is located between the valve seat and the gate, directly bearing the medium pressure, and the second layer of sealing is located at other locations inside the valve body, such as the valve stem packing or the connection between the valve cover and the valve body. This double-seal valve meets the sealing requirements to a certain extent, but also has its own limitations.

[0004] With the continuous advancement of industrial technology and increasingly stringent environmental protection requirements, the requirements for valve sealing performance are becoming higher and higher. The existing sealing technology can no longer meet the comprehensive needs of modern industry for valve sealing, reliability and durability. At the same time, it cannot meet the requirements of flow battery electrolyte delivery valves. Therefore, new valve sealing technology came into being, injecting new vitality into the development of valve sealing technology; therefore, a new solution is urgently needed to solve this technical problem. Summary of the invention

[0005] The present invention is aimed at the technical problems existing in the prior art and provides a valve with excellent sealing performance. The solution provides a valve leakage prevention device for liquid flow battery electrolyte delivery. A double two-stage sealing process is adopted between the valve body and the closing member, and a three-stage sealing process is designed between the valve body and the valve stem. These sealing processes achieve sealing by the sealing surfaces being in close contact after precision machining, or by the sealing surfaces being deformed by compression molding, thereby ensuring the reliability and safety of the valve during operation.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a valve with excellent sealing performance, the valve includes a valve wrench, a stuffing gland, a valve stem, a valve body, a valve seat, a nut, a pipe joint, a multi-layer O-ring, a multi-layer square sealing ring and a valve core with an internal structure of the valve body, the left and right ends of the valve body are respectively a liquid inlet port and a liquid outlet port, a valve ball is arranged in the valve body, and a valve stem, a stuffing bin and a valve wrench are arranged on the upper end of the valve ball; wherein the liquid inlet port and the liquid outlet port are both provided with a valve seat, a nut and a pipe joint.

[0007] As an improvement of the present invention, at the liquid outlet port, an O-ring four is placed on the inner side of the valve seat at a position tangent to the ball valve; at the outer side of the valve seat in close contact with the nut, a square sealing ring one is placed; the outer diameter of the liquid outlet port is widened to form a groove, in which a square sealing ring two can be placed, forming a double secondary sealing device for the valve when a passage is formed; a pressing bin is added to the upper end of the valve body, so that an O-ring three can be placed inside the pressing bin, and at the lower end of the O-ring three, an O-ring one and an O-ring two are successively installed between the valve body and the valve stem, and on the basis of the internal seal of the valve, an external sealing ring is added to form a three-stage sealing device, and the width of the widened liquid outlet port is 1-5mm, which is used to place a flat gasket to form an external seal.

[0008] As an improvement of the present invention, the width of the liquid outlet port is widened to 1-5 mm for placing a flat gasket to form an external seal.

[0009] As an improvement of the present invention, the valve body is made of one or more of polypropylene (PP), polyvinyl chloride (PVC), random copolymer polypropylene (PPR), stainless steel, and titanium alloy; it has good mechanical properties and certain chemical resistance to organic electrolytes.

[0010] As an improvement of the present invention, both the O-ring and the square sealing ring are made of ethylene propylene diene monomer rubber (EPDM), silicone rubber, fluororubber and other materials, and have the properties of oxidation resistance and corrosion resistance.

[0011] As an improvement of the present invention, the upper end of the valve ball is closely connected to the valve stem, and O-ring 1 and O-ring 2 are respectively placed at two three-point points of the valve stem. Then a pressure bin is provided, in which the O-ring is placed, and O-ring 3 is placed in the pressure bin. Under the action of the packing gland, the purpose of sealing is achieved through close contact or compression deformation.

[0012] As an improvement of the present invention, the O-ring and the square sealing ring have different models and are customized according to specific needs, and the thickness is mostly 2.5-2.8 mm.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. In view of the shortcomings of the internal seal design currently on the market, this solution designs a valve with multiple internal and external seals based on the internal seal. This design enables the valve to form multiple sealing layers when it is closed. When a small leak occurs in the first layer of seal, the second or third layer can be replenished in time, which has a backup guarantee function to prevent medium leakage. This design not only improves the sealing of the valve, but also enhances the reliability and safety of the valve and extends the service life of the valve. In addition, the internal and external multiple seal valve design also helps to reduce the maintenance cost of the valve, reduce equipment damage and maintenance costs caused by leakage, and increase the overall service life of the equipment. At the same time, it effectively prevents the leakage and waste of the medium, reduces energy consumption and environmental pollution. Through the design of multi-layer sealing rings, elastic sealing pads and adaptive sealing surfaces, the valve can be stably sealed in high pressure, high temperature or corrosive media environments.

[0015] 2. The sealing structure is set between the valve body and the valve core, the valve body and the valve stem, the valve seat and the nut, etc., including multiple layers of different types of sealing rings to ensure that the valve can form a tight seal when it is closed; the adjustment mechanism is used to control the opening and closing of the valve core to achieve precise adjustment of the fluid;

[0016] 3. Valve process design:

[0017] First, the position of the liquid outlet port of the valve body is widened to form a groove between it and the valve seat for placing a flat gasket; second, a pressure bin is added at the upper end of the valve body for filling the sealing gasket to form an external sealing device of the valve.

[0018] The design of the sealing structure includes:

[0019] Multi-layer sealing rings and gaskets: The same material and different types of sealing rings are combined to form a multi-channel sealing barrier to improve the sealing performance. The sealing rings between the valve cap and the valve core, the valve body and the closing piece, the valve body and the valve stem, the valve stem and the packing gland, and the valve cap and the valve core are all O-type sealing rings, which use elastic deformation to fill the gap and enhance the sealing effect; the sealing rings between the valve body and the closing piece, and the valve stem and the pressure bin are all square. The sealing surface is designed to be adaptive, which can automatically adjust the sealing gap when the pressure changes to maintain stable sealing performance.

[0020] O-rings are used between the valve cap and the valve core, between the valve body and the closing piece, between the valve body and the valve stem, between the valve stem and the packing gland, and between the valve cap and the valve core. They use elastic deformation to fill the gap and enhance the sealing effect. Square rings are used between the valve body and the closing piece, and between the valve stem and the pressure bin. The sealing surface is designed to be an adaptive shape, which can automatically adjust the sealing gap when the pressure changes to maintain stable sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the main structure of the existing valve.

[0022] Figure 2 It is a schematic diagram of the structure of the valve components.

[0023] Figure 3 This is a cross-sectional view of the valve.

[0024] Among them, 1. valve wrench; 2. packing gland; 3. valve stem; 4. valve body; 5. cap; 6. nut; 7. pipe joint; 8. O-ring one; 9. O-ring two; 10. O-ring three; 11. O-ring four; 12. square seal one; 13. square seal two; 14. pressure bin; 15. groove. DETAILED DESCRIPTION

[0025] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0026] Example: See Figure 2 , Figure 3 , a valve with excellent sealing performance, the valve comprises a valve wrench 1, a stuffing gland 2, a valve stem 3, a valve body 4, a valve seat 5, a nut 6, a pipe joint 7, a multi-layer O-ring (8, 9, 10, 11), a multi-layer square sealing ring (12, 13) and a valve core of the internal structure of the valve body, the left and right ends of the valve body 4 are respectively a liquid inlet port and a liquid outlet port, a valve ball is arranged in the valve body 4, and a valve stem 3, a stuffing bin 14 and a valve wrench 1 are arranged on the upper end of the valve ball; wherein the liquid inlet port and the liquid outlet port are both provided with a valve seat 5, a nut 6 and a pipe joint 7.

[0027] At the liquid outlet port, an O-ring 4 11 is placed at the tangent position of the valve seat 5 inside the ball valve; a square ring 12 is placed at the position where the valve seat 5 outside is close to the nut 6; the outer diameter of the liquid outlet port is widened to form a groove, which can be placed in a square ring 2 13, forming a double secondary sealing device for the valve when forming a passage; a pressing bin 14 is added to the upper end of the valve body, so that an O-ring 3 10 can be placed inside the pressing bin 14, and at the lower end of the O-ring 3, an O-ring 1 8 and an O-ring 2 9 are installed between the valve body 4 and the valve stem 3 in succession. On the basis of the internal sealing of the valve, an external sealing ring is added to form a three-level sealing device. The width of the widened liquid outlet port is 1-5mm, which is used to place a flat gasket to form an external seal.

[0028] The width of the liquid outlet port is widened by 1-5 mm, which is used to place a flat gasket to form an external seal.

[0029] The valve body is made of one or more of polypropylene (PP), polyvinyl chloride (PVC), random copolymer polypropylene (PPR), stainless steel, and titanium alloy; it has good mechanical properties and certain chemical resistance to organic electrolytes.

[0030] O-rings and square rings are made of EPDM, silicone rubber, fluororubber and other materials, and have oxidation resistance and corrosion resistance.

[0031] The upper end of the valve ball is closely connected to the valve stem 3, and O-ring one 8 and O-ring two 9 are placed at two three-point points of the valve stem 3 respectively. Then a pressing bin 14 is set, in which the O-ring is placed, and O-ring three 10 is placed in the pressing bin. Under the action of the packing gland, the purpose of sealing is achieved through close contact or compression deformation.

[0032] O-rings and square rings have different models and are customized according to specific needs. The specifications are mostly 2.5-2.8mm.

[0033] The embodiments of the present invention are applied to liquid flow batteries, and the most commercial valve structure is selected to perform performance tests on it.

[0034] First, test its sealing performance and detect the airtightness. First, seal the liquid outlet port of the valve and pressurize the liquid inlet. After pressurization, seal the liquid inlet port and place the sealing device in clean water for 1-2 minutes to observe whether there are bubbles. If not, the sealing performance is excellent.

[0035] The valve described in the present application adopts a ball valve structure. The internal delivery channel of the valve body is divided into two parts, left and right, by the ball valve. The left channel is the liquid inlet port, and the right channel is the liquid outlet port. A valve stem 3 connected to the valve ball is arranged above the delivery channel. A valve wrench 1 is arranged on the valve stem 3. The fluid is controlled by rotating the valve wrench 1.

[0036] Working principle of the valve: There is a valve wrench 1 above the valve stem. When the valve wrench 1 is turned to rotate the valve stem 3, the internal ball valve will also rotate. The 90-degree rotation of the ball will change the shape of the channel in the valve body, thereby realizing the opening and closing of the valve body. Specifically, when the flow channel hole of the ball is aligned with the channel hole of the valve body, the valve ball is in an open state, and the fluid can pass through unimpeded; when the ball is rotated 90 degrees, the flow channel hole of the ball is perpendicular to the valve channel hole, and the valve hole is in a closed state. At this time, the ball is pushed to the valve seat at the outlet end of the valve under the action of the fluid pressure, pressing and ensuring the seal.

[0037] like Figure 3 At the liquid outlet, when the built-in cap 5 and the ball valve are in the fluid passage, there is an O-type sealing ring 11 at the contact position between the cap 5 and the ball valve, and then along the thread between the cap and the valve body to the liquid outlet, the valve body liquid outlet end is widened to form a groove, which can be placed in a square sealing ring 13; on the outside of the cap 5, a square sealing ring 12 is placed at the contact point with the nut 6; so that a double two-stage sealing device is formed at the liquid outlet position to improve the sealing performance of the valve;

[0038] like Figure 3 As shown, the upper end of the valve ball is closely connected to the valve stem 3, and an O-ring 1 8 and an O-ring 2 9 are respectively placed at two three-point points of the valve stem 3. Then a pressure bin is provided, in which an O-ring is placed, and an O-ring 3 10 is placed in the pressure bin. Under the action of the packing gland, the purpose of sealing is achieved through close contact or compression deformation.

[0039] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A valve with excellent sealing performance, characterized in that: The valve includes a valve wrench, a stuffing gland, a valve stem, a valve body, a valve seat, a nut, a pipe joint, a multi-layer O-ring, a multi-layer square sealing ring and a valve core in the internal structure of the valve body. The left and right ends of the valve body are respectively a liquid inlet port and a liquid outlet port. A valve ball is arranged in the valve body, and a valve stem, a stuffing bin and a valve wrench are arranged on the upper end of the valve ball; wherein the liquid inlet port and the liquid outlet port are both provided with a valve seat, a nut and a pipe joint.

2. The valve with excellent sealing performance according to claim 1, characterized in that: At the liquid outlet port, an O-ring four is placed on the inner side of the valve seat at a position tangent to the ball valve; a square sealing ring one is placed on the outer side of the valve seat in close contact with the nut; the outer diameter of the liquid outlet port is widened to form a groove, in which a square sealing ring two can be placed, forming a double secondary sealing device for the valve when a passage is formed; a pressing bin is added to the upper end of the valve body, so that an O-ring three can be placed inside the pressing bin, and at the lower end of the O-ring three, an O-ring one and an O-ring two are successively installed between the valve body and the valve stem. On the basis of the internal seal of the valve, an external sealing ring is added to form a three-stage sealing device, and the width of the widened liquid outlet port is 1-5mm, which is used to place a flat gasket to form an external seal.

3. The valve with excellent sealing performance according to claim 2, characterized in that: The width of the liquid outlet port is widened by 1-5 mm, which is used to place a flat gasket to form an external seal.

4. The valve with excellent sealing performance according to claim 1, characterized in that: The valve body is made of one or a combination of polypropylene (PP), polyvinyl chloride (PVC), random copolymer polypropylene (PPR), stainless steel, and titanium alloy.

5. The valve with excellent sealing performance according to claim 1, characterized in that: O-rings and square rings are made of EPDM, silicone rubber, and fluororubber, which are resistant to oxidation and corrosion.

6. The valve with excellent sealing performance according to claim 2, characterized in that: The upper end of the valve ball is closely connected to the valve stem, and O-ring one and O-ring two are respectively placed at two three-point points of the valve stem. Then a pressure bin is set up, in which the O-ring is placed, and O-ring three is placed in the pressure bin. Under the action of the packing gland, the purpose of sealing is achieved through close contact or compression deformation.

7. The valve with excellent sealing performance according to claim 2, characterized in that: O-rings and square rings are available in different models and can be customized according to specific needs, with a thickness of 2.5-2.8mm.

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