Friction reducing step seal ring for oil pipeline pumps and method of forming same

Abstract

The application relates to the technical field of seal ring preparation, in particular to a wear-reducing gradient seal ring for an oil pipeline pump and a forming method thereof, which can solve the problem that the service life of the seal ring is shortened due to the existence of impeller deviation in the operation process of the oil pipeline pump. The seal ring comprises a base layer which is annular and made of 1Cr13MoS; a wear-resistant layer which is fixedly connected to the outer side of the base layer, the wear-resistant layer is made of hard alloy, and the thickness of the wear-resistant layer is 2mm-3mm; and an intermediate layer which is fixedly connected between the base layer and the wear-resistant layer, the intermediate layer is made of 022Cr17Ni12Mo2 plastic alloy, and the thickness of the intermediate layer is 1.5mm-2mm.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of seal ring preparation, in particular to a wear-reducing gradient seal ring for an oil pipeline pump and a forming method thereof. BACKGROUND

[0002] The seal ring (impeller ring and pump body ring) for a centrifugal pump belongs to a friction pair. In order to prolong the service life of the seal ring, the surface of the seal ring is usually subjected to strengthening treatment to improve the hardness and wear resistance. At present, the main strengthening methods include nitriding, manual argon arc surfacing, plasma surfacing and laser cladding. The most commonly used strengthening method is plasma surfacing. A layer of hard alloy is directly surfaced on the surface of the seal ring through the plasma surfacing technology.

[0003] The seal ring, also known as the ring, is used to reduce the wear between the impeller and the pump shell and prolong the service life of the impeller and the pump shell. When the gap of the seal ring is reduced, the scraping frequency of the impeller seal ring and the pump body seal ring will increase, so the matching surface of the seal ring is required to have not only a certain wear resistance but also self-lubricity to reduce the mechanical power loss. In the prior art, hard alloy is surfaced on the surface of the seal ring of the oil pipeline pump. After the hard alloy is surfaced, the hardness of the seal ring of the oil pipeline pump is improved, so that the purpose of reducing the use loss of the seal ring of the oil pipeline pump is achieved.

[0004] Since the impeller will be offset up and down or left and right during the operation of the oil pipeline pump, the offset will change the distance between the impeller and the pump shell, and after the distance is changed, the probability of friction between the impeller and the pump shell will increase, thereby shortening the service life of the seal ring. SUMMARY

[0005] In order to solve the problem that the service life of the seal ring is shortened due to the offset of the impeller during the operation of the oil pipeline pump, the application provides a wear-reducing gradient seal ring for an oil pipeline pump and a forming method thereof.

[0006] Embodiments of the application are implemented as follows:

[0007] In a first aspect, the embodiments of the application provide a wear-reducing gradient seal ring for an oil pipeline pump, which comprises:

[0008] A base layer in the shape of a ring and made of 1Cr13MoS;

[0009] A wear-resistant layer fixedly connected to the outer side of the base layer, made of hard alloy, and having a thickness of 2mm-3mm;

[0010] An intermediate layer fixedly connected between the base layer and the wear-resistant layer, made of 022Cr17Ni12Mo2 plastic alloy, and having a thickness of 1.5mm-2mm.

[0011] In some embodiments, the wear-resistant layer comprises 95-100% of Ni60 and 0-5% of Nb.

[0012] In a second aspect, the embodiments of the present application provide a forming method of a wear-reducing gradient sealing ring for an oil pipeline pump, the forming method comprising:

[0013] heating the sealing ring base layer and heat preserving the heated sealing ring base layer;

[0014] preparing an intermediate layer alloy powder and a wear-resistant layer alloy powder, and drying the intermediate layer alloy powder and the wear-resistant layer alloy powder respectively in a drying oven at 150℃ for at least 2h;

[0015] plasma surfacing the intermediate layer alloy powder on the outer wall of the sealing ring base layer, the thickness of the intermediate layer alloy powder being 1.5-2mm;

[0016] plasma surfacing the wear-resistant layer alloy powder on the outside of the intermediate layer alloy powder surfacing layer, the thickness of the wear-resistant layer alloy powder being 2-3mm;

[0017] placing the surfacing sealing ring in vermiculite powder for stress relief.

[0018] In some embodiments, in the step of heating the sealing ring base layer and heat preserving the heated sealing ring base layer, the forming method comprises:

[0019] heating the sealing ring base layer to 200℃ and heat preserving the sealing ring base layer at 200℃ for 2h.

[0020] In some embodiments, in the process of plasma surfacing the intermediate layer alloy powder on the outer wall of the sealing ring base layer, the welding parameters of the plasma surfacing are as follows: the transfer arc current is 140A, the transfer arc voltage is 30V, the swing amplitude is 20mm, the welding speed is 50mm / min, the powder feeding speed is 28g / min, and the protective gas flow speed is 10L / min.

[0021] In some embodiments, in the process of plasma surfacing the wear-resistant layer alloy powder on the outside of the intermediate layer alloy powder surfacing layer, the welding parameters of the plasma surfacing are as follows: the transfer arc current is 140A, the transfer arc voltage is 30V, the swing amplitude is 20mm, the welding speed is 50mm / min, the powder feeding speed is 28g / min, and the protective gas flow speed is 10L / min.

[0022] In some embodiments, after the step of placing the surfacing sealing ring in vermiculite powder for stress relief, the forming method further comprises:

[0023] According to the preset size of the sealing ring, the outer wall size of the sealing ring after cooling is machined by cutting.

[0024] The beneficial effects of the present application are achieved by setting the intermediate layer composed of 022Cr17Ni12Mo2 plastic alloy between the base layer and the wear-resistant layer of the sealing ring, which is used to improve the elastic-plasticity of the sealing ring, facilitate the change of the thickness of the sealing ring during the operation of the impeller of the oil pipeline pump, and achieve the purpose of reducing the continuous friction between the sealing ring and the pump body. At the same time, the intermediate layer and the base layer are protected by the wear-resistant layer, reducing the probability of wear and tear of the intermediate layer and the base layer, thereby achieving the purpose of improving the service life of the sealing ring.

[0025] The intermediate layer is welded on the outside of the base layer by plasma surfacing, and the wear-resistant layer is welded on the outside of the intermediate layer by plasma surfacing. Since the intermediate layer is made of plastic alloy and the wear-resistant layer is made of hard alloy, the wear-resistant effect of the outer wall of the sealing ring is improved by the hard alloy, and the sealing ring has elastic-plasticity by the intermediate layer, so that the sealing ring has wear resistance and also has elastic-plasticity, which can achieve the purpose of improving the service life of the sealing ring. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structure schematic diagram of the wear-reducing gradient sealing ring for the oil pipeline pump according to an embodiment of the present application.

[0027] Figure 2 It is a flowchart of the forming method of the wear-reducing gradient sealing ring for the oil pipeline pump according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to facilitate the technical solutions of the application, the following first explains some concepts related to the present application. The brief explanation of the terms in the present application is only for the convenience of understanding the following described embodiments, and is not intended to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0029] The terms "first", "second", "third" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean a specific order or sequence, unless otherwise specified. It should be understood that the terms used in this way can be interchanged under appropriate circumstances.

[0030] The terms "include" and "have" and any variations thereof are intended to cover but not exclusive inclusion, for example, a product or device including a series of components does not have to be limited to all components clearly listed, but can include other components not clearly listed or inherent to these products or devices.

[0031] Referring to Figure 1 , Figure 1 It is a structure diagram of a wear-reducing gradient sealing ring for an oil pipeline pump according to an embodiment of the present application.

[0032] The present application provides a wear-reducing gradient sealing ring for an oil pipeline pump, which comprises a base layer, an intermediate layer and a wear-resistant layer. The material of the base layer is set to 1Cr13MoS, the base layer is annular and used to form the sealing ring; the material of the intermediate layer is implemented as 022Cr17Ni12Mo2 plastic alloy, the intermediate layer is integrated with the base layer by means of plasma surfacing, and the thickness of the intermediate layer is implemented as 1.5mm-2mm; the material of the wear-resistant layer is hard alloy, the wear-resistant layer is located on the outside of the intermediate layer, and the wear-resistant layer is integrated with the intermediate layer by means of plasma surfacing.

[0033] By setting the intermediate layer composed of 022Cr17Ni12Mo2 plastic alloy between the base layer and the wear-resistant layer of the sealing ring, the 022Cr17Ni12Mo2 plastic alloy is used to improve the plasticity of the sealing ring, which can facilitate the change of the sealing ring during the impeller offsetting process during the operation of the oil pipeline pump, and can achieve the purpose of reducing the continuous friction between the sealing ring and the pump body; at the same time, the intermediate layer and the base layer are protected by the wear-resistant layer, which reduces the probability of wear and tear of the intermediate layer and the base layer, and thus achieves the purpose of improving the wear resistance of the outer wall of the sealing ring.

[0034] In some embodiments, in order to facilitate the wear-resistant layer to protect the intermediate layer and the base layer of the sealing ring, the wear-resistant layer comprises Ni60 with a mass fraction of 95%-100% and Nb with a mass fraction of 0%-5%, in which the mass fraction of Ni60 is implemented as 95%, and the mass fraction of Nb is implemented as 5%.

[0035] By using Ni60 or a mixed alloy of Ni60 and Nb, the hardness of the outer wall of the sealing ring is improved, and thus the base layer and the intermediate layer of the sealing ring are protected, which facilitates the continuous action of the intermediate layer to improve the plasticity of the sealing ring. The intermediate layer is protected by the wear-resistant layer, and the intermediate layer can adjust the wall thickness of the sealing ring through its plasticity, thereby protecting the wear-resistant layer to improve the service life of the overall sealing ring.

[0036] The beneficial effects of the embodiments of the present part are that, by arranging the intermediate layer composed of 022Cr17Ni12Mo2 plastic alloy between the base layer and the wear-resistant layer of the sealing ring, the 022Cr17Ni12Mo2 plastic alloy is used to improve the elastic-plasticity of the sealing ring, which can facilitate the change of the sealing ring during the process of impeller deviation during the operation of the oil pipeline pump, and can achieve the purpose of reducing the continuous friction between the sealing ring and the pump body. At the same time, the intermediate layer and the base layer are protected by arranging the wear-resistant layer, which reduces the probability of wear and tear of the intermediate layer and the base layer, thereby achieving the purpose of improving the wear resistance of the outer wall of the sealing ring.

[0037] Referring to Figure 2 , Figure 2 The flow chart of the forming method of the wear-reducing gradient sealing ring for the oil pipeline pump according to an embodiment of the present application.

[0038] Corresponding to the foregoing disclosed embodiments of the sealing ring, the present application also provides a forming method of a wear-reducing gradient sealing ring for an oil pipeline pump. The forming method comprises:

[0039] heating the sealing ring base layer and heat preserving the heated sealing ring base layer;

[0040] Preparation of intermediate layer alloy powder and wear-resistant layer alloy powder, and placing the intermediate layer alloy powder and the wear-resistant layer alloy powder in a drying oven at 150℃ for at least 2h;

[0041] Plasma surfacing the intermediate layer alloy powder on the outer wall of the sealing ring base layer, and the thickness of the intermediate layer alloy powder is 1.5mm-2mm;

[0042] Plasma surfacing the wear-resistant layer alloy powder on the outside of the intermediate layer alloy powder surfacing layer, and the thickness of the wear-resistant layer alloy powder is 2mm-3mm;

[0043] The surfacing sealing ring is placed in vermiculite powder for slow cooling and stress relief.

[0044] By plasma surfacing the intermediate layer on the outside of the base layer and plasma surfacing the wear-resistant layer on the outside of the intermediate layer, since the intermediate layer is arranged as a plastic alloy and the wear-resistant layer is arranged as a hard alloy, the wear-resistant effect of the outer wall of the sealing ring is improved by the hard alloy, and the sealing ring has elastic-plasticity by the intermediate layer, so that the sealing ring has wear resistance and also has elastic-plasticity, which can achieve the purpose of improving the service life of the sealing ring.

[0045] In some embodiments, in the step of heating the sealing ring base layer and heat preserving the heated sealing ring base layer, the forming method provided by the present application comprises: preheating the sealing ring base layer to 200℃, and heat preserving the sealing ring base layer at 200℃ for 2h.

[0046] By heating the base layer of the sealing ring to 200℃ and maintaining for 2h, the intermediate layer powder of the sealing ring can be connected to the base layer by plasma surfacing in the subsequent processing process, so as to improve the connection efficiency of the intermediate layer and the base layer of the sealing ring, thereby improving the connection of the intermediate layer and the base layer and improving the elastic-plasticity of the sealing ring.

[0047] In some embodiments, the forming method disclosed in the present application comprises:

[0048] Heating the base layer of the sealing ring, and maintaining the heated base layer of the sealing ring;

[0049] Preparation of intermediate layer alloy powder and wear-resistant layer alloy powder, and placing the intermediate layer alloy powder and the wear-resistant layer alloy powder in a drying oven at 150℃ for at least 2h;

[0050] Plasma surfacing of the intermediate layer alloy powder on the outer wall of the base layer of the sealing ring, the thickness of the intermediate layer alloy powder being 1.5mm-2mm; the plasma surfacing welding parameters of the intermediate layer alloy powder being: transfer arc current 140A, transfer arc voltage 30V, swing amplitude 20mm, welding speed 50mm / min, powder feeding speed 28g / min, and protective gas flow rate 10L / min;

[0051] Plasma surfacing of the wear-resistant layer alloy powder on the outside of the intermediate layer alloy powder surfacing layer, the thickness of the wear-resistant layer alloy powder being 2mm-3mm; the plasma surfacing welding parameters being: transfer arc current 140A, transfer arc voltage 30V, swing amplitude 20mm, welding speed 50mm / min, powder feeding speed 28g / min, and protective gas flow rate 10L / min.

[0052] The surfacing sealing ring is placed in vermiculite powder for stress relief.

[0053] By using plasma welding to sequentially weld the intermediate layer of the sealing ring on the outside of the base layer and simultaneously surfacing the wear-resistant layer on the outside of the intermediate layer, a sealing ring with both elastic-plasticity and wear resistance is obtained, so as to realize the adjustment of the thickness of the sealing ring according to the offset of the impeller of the oil pipeline pump, thereby improving the service life of the sealing ring.

[0054] In some embodiments, after the step of placing the surfacing sealing ring in vermiculite powder for stress relief, the size of the outer wall of the sealing ring will change after surfacing the wear-resistant layer. In order to facilitate the sealing ring to adapt to the size of the pump body of the oil pipeline pump, the outer wall of the sealing ring is machined according to the size of the pump body by machining, so as to realize the protection of the contact surface between the pump body and the impeller, and improve the service life of the sealing ring.

[0055] The beneficial effect of the embodiments in the part is that the intermediate layer is deposited on the outer side of the base layer by plasma surfacing, and the wear-resistant layer is deposited on the outer side of the intermediate layer by plasma surfacing. Since the intermediate layer is made of plastic alloy and the wear-resistant layer is made of hard alloy, the wear-resistant effect of the outer wall of the sealing ring is improved by the hard alloy, and the sealing ring has elastic plasticity by the intermediate layer, so that the sealing ring has wear resistance and also has elastic plasticity, and the service life of the sealing ring can be improved.

Claims

1. A friction-reducing gradient sealing ring for an oil pipeline pump, characterized in that, The sealing ring includes: The base layer is ring-shaped and made of 1Cr13MoS. A wear-resistant layer is fixedly connected to the outside of the base layer. The wear-resistant layer is made of hard alloy and has a thickness of 2mm-3mm. An intermediate layer, fixedly connected between the base layer and the wear-resistant layer, is made of 022Cr17Ni12Mo2 ductile alloy, and its thickness is 1.5mm-2mm. The preparation process of the intermediate layer and the wear-resistant layer is as follows: An intermediate layer of alloy powder is deposited on the outer wall of the sealing ring base layer by plasma welding. The thickness of the intermediate layer of alloy powder is 1.5mm-2mm. Wear-resistant alloy powder is deposited on the outside of the intermediate layer alloy powder overlay by plasma welding. The thickness of the wear-resistant alloy powder is 2mm-3mm. During the process of depositing the intermediate layer alloy powder on the outer wall of the sealing ring base by plasma welding, the welding parameters of plasma welding are: transfer arc current of 140 A, transfer arc voltage of 30 V, oscillation amplitude of 20 mm, welding speed of 50 mm / min, powder feeding speed of 28 g / min, and shielding gas flow rate of 10 L / min.

2. The anti-friction gradient sealing ring for an oil pipeline pump according to claim 1, characterized in that, The wear-resistant layer comprises 95%-100% Ni60 and 0%-5% Nb.

3. A method for forming a friction-reducing gradient sealing ring for an oil pipeline pump as described in claim 1, characterized in that, The forming method includes: Heat the sealing ring base layer and then insulate the heated sealing ring base layer. Intermediate layer alloy powder and wear-resistant layer alloy powder were prepared by drying them in a drying oven at 150°C for at least 2 hours. An intermediate layer of alloy powder is deposited on the outer wall of the sealing ring base layer by plasma welding. The thickness of the intermediate layer of alloy powder is 1.5mm-2mm. Wear-resistant alloy powder is deposited on the outside of the intermediate alloy powder overlay layer by plasma overlay, and the thickness of the wear-resistant alloy powder is 2mm-3mm. During the process of depositing intermediate alloy powder on the outer wall of the sealing ring base layer by plasma cladding, the plasma cladding welding parameters are as follows: transfer arc current is 140 A, transfer arc voltage is 30 V, oscillation amplitude is 20 mm, welding speed is 50 mm / min, powder feeding speed is 28 g / min, and shielding gas flow rate is 10 L / min. After welding, the sealing ring is placed in vermiculite powder to cool slowly and relieve stress.

4. The method for forming a friction-reducing gradient sealing ring for an oil pipeline pump according to claim 3, characterized in that, In the step of heating the sealing ring base layer and then insulating the heated sealing ring base layer, the forming method includes: Heat the sealing ring base layer to 200℃ and keep it at 200℃ for 2 hours.

5. The method for forming a friction-reducing gradient sealing ring for an oil pipeline pump according to claim 3, characterized in that, During the process of plasma welding of the wear-resistant alloy powder layer on the outside of the intermediate alloy powder overlay layer, the welding parameters of plasma welding are as follows: transfer arc current is 140A, transfer arc voltage is 30V, oscillation amplitude is 20mm, welding speed is 50mm / min, powder feeding speed is 28g / min, and shielding gas flow rate is 10L / min.

6. The method for forming a friction-reducing gradient sealing ring for an oil pipeline pump according to claim 3, characterized in that, After the step of placing the welded sealing ring in vermiculite powder for slow cooling and stress relief, the forming method further includes: The outer wall dimensions of the sealing ring are machined by cutting according to the preset dimensions of the sealing ring after cooling.

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