Cooling liquid self-circulation sand pump

Abstract

The utility model discloses a cooling liquid self-circulation sand pump which is characterized in that the cooling liquid self-circulation sand pump comprises a main shaft, a mechanical seal pump cover and a sealing seat, the main shaft penetrates through the sealing seat and the mechanical seal pump cover, a mechanical seal device and an oil seal are installed on the mechanical seal pump cover and the sealing seat respectively for sealing, a pumping ring is arranged between the mechanical seal device and the oil seal, the pumping ring is fixed on the main shaft, and the main shaft penetrates through the sealing seat. The upper end and the lower end of the sealing seat are provided with a discharging connector and a connecting connector respectively, the discharging connector is communicated with the position over the pumping ring, and the connecting connector is communicated with the position below the side of the pumping ring. By arranging the pumping ring, in the operation process of the sand pump, a pressure difference is generated at a cooling liquid discharging connector and a cooling liquid discharging connector, so that the cooling liquid can achieve self-circulation, and the lubricating and cooling effects on the mechanical seal device are achieved.

Description

Technical Field

[0001] The utility model relates to the field of oil and natural gas drilling, in particular to a coolant self-circulating sand pump. Background Art

[0002] Sand pump is the most commonly used equipment for drilling fluid transportation in the oil and gas drilling industry. Sand pump uses mechanical seal device (referred to as: mechanical seal) as a key component to seal the liquid to be transported. It uses the pre-pressure of the spring to form a dynamic seal pair between the friction end faces of the carbide dynamic ring and the carbide static ring. Due to the high rotation speed of the sand pump, the relative linear speed between the dynamic ring and the static ring is high, and the heat and wear generated by friction are also large. When there is no liquid entering the pump body at the inlet of the pump, the mechanical seal device lacks timely cooling and is prone to unconventional burning due to high friction heat and high temperature.

[0003] In recent years, a double-machine seal sand pump has emerged based on the traditional sand pump. It uses two hard alloy seal pairs to form a double mechanical seal, and coolant or lubricant is added between the two seals to cool and lubricate them. The double-machine seal device has a more complex structure and a higher manufacturing cost. The spring is arranged on the inside, which brings technical problems such as the upper limit of the sand pump pressure. Utility Model Content

[0004] The utility model aims to provide a coolant self-circulating sand pump to solve the problem of poor cooling effect of the sand pump seal.

[0005] The utility model is implemented by adopting the following technical scheme: a coolant self-circulating sand pump, characterized in that it comprises a main shaft, a machine seal pump cover and a sealing seat, the main shaft passes through the machine seal pump cover and the sealing seat, a machine seal device and an oil seal are respectively installed on the machine seal pump cover and the sealing seat, a pumping ring is arranged between the machine seal device and the oil seal, the pumping ring is fixed on the main shaft, a discharge interface and an access interface are respectively arranged at the upper and lower ends of the sealing seat, the discharge interface is connected to the top of the pumping ring, the access interface is connected to the bottom side of the pumping ring, when the main shaft and the pumping ring rotate, the discharge interface is in a high-pressure area, and the access interface is in a low-pressure area.

[0006] Furthermore, two communicating annular cavities are formed between the sealing seat and the main shaft, and the pumping ring is located in the larger one of the two communicating annular cavities.

[0007] Furthermore, the access interface is connected to the smaller annular cavity between the sealing seat and the main shaft, and the discharge interface is connected to the larger annular cavity between the sealing seat and the main shaft, and the cavity is filled with coolant; when the main shaft and the pumping ring rotate, a higher liquid pressure than that of the smaller annular cavity will be generated in the larger annular cavity, thereby providing the power required for the self-circulation of the coolant; when the pumping ring rotates, the coolant in the annular cavity where the pumping ring is located generates a pressure higher than that in the other cavity, so that the coolant generates power for self-circulation.

[0008] Furthermore, the mechanical sealing device includes a spring, a dynamic ring and a static ring. The dynamic ring contacts the static ring. The spring is arranged on one side of the dynamic ring. The dynamic ring forms a dynamic sealing surface with the static ring under the pressure of the spring.

[0009] Furthermore, the mechanical seal device is a dynamic seal arranged between the mechanical seal pump cover and the main shaft; the oil seal is a dynamic seal arranged between the sealing seat and the main shaft; the annular cavity is located between the mechanical seal pump cover, the mechanical seal device and the sealing seat, and the oil seal.

[0010] Furthermore, the discharge interface and the access interface are respectively connected to the coolant bottle through pipelines to form a circulation path.

[0011] Furthermore, a plurality of notches are provided on the pumping ring to improve the circulation efficiency of the coolant.

[0012] The beneficial effect of the utility model is that by setting the pumping ring, a pressure difference is generated between the discharge interface and the discharge interface of the coolant during the operation of the sand pump, which provides kinetic energy for the self-circulation of the coolant. Thus, the coolant can realize self-circulation and play a role in lubricating and cooling the mechanical seal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of a coolant self-circulating sand pump;

[0015] Figure 2 It is a partial schematic diagram of the mechanical sealing device of the utility model;

[0016] In the figure, 1- pump casing, 2- impeller, 3- main shaft, 4- mechanical seal pump cover, 5- mechanical seal device, 6- sealing seat, 7- oil seal, 8- pumping ring, 9- shaft sleeve, 10- pump seat, 51- spring, 52- moving ring, 53- stationary ring, 61- discharge interface, 62- access interface. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in other different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1-2 As shown, a coolant self-circulating sand pump includes a pump casing 1, an impeller 2, a main shaft 3, a mechanical seal pump cover 4, a mechanical seal device 5, a sealing seat 6, an oil seal 7, a pumping ring 8, a shaft sleeve 9 and a pump seat 10.

[0020] The mechanical seal device 5 is located in the annular space formed by the impeller 2, the mechanical seal pump cover 4 and the sealing seat 6. The dynamic ring 52 and the static ring 53 of the mechanical seal device 5 form a dynamic sealing surface with the static ring 53 under the pressure of the spring 51, and together with the oil seal 7, separate the annular space into a fluid material space and a lubricating coolant cavity.

[0021] The upper and lower ends of the sealing seat 6 are provided with a discharge interface 61 and an access interface 62 for lubricating coolant, which are respectively connected to the corresponding interfaces of the external coolant bottle, and the minimum liquid level is higher than the corresponding interface of the access port.

[0022] A pumping ring 8 is installed on the main shaft 3 and rotates together with the main shaft 3, so that the lubricating coolant near the pumping ring 8 has a local pressure higher than the liquid at other positions. The lubricating coolant with local pressure is continuously sent out of the discharge interface 61, and the coolant in the external coolant bottle is replenished into the cavity from the access interface 62, so that the lubricating coolant can circulate and take away the heat generated by the friction pair of the dynamic ring 52 and the static ring 53 of the mechanical seal device 5, thereby achieving the lubrication and cooling effect on the mechanical seal device 5.

[0023] The pumping ring 8 is located between the sealing seat 6 and the main shaft 3. At the same time, two interconnected annular cavities are formed between the sealing seat 6 and the main shaft 3. The pumping ring 8 is the larger of the two interconnected annular cavities. At the same time, the access interface 62 is connected to the smaller annular cavity, and the discharge interface 61 is connected to the larger annular cavity. When local high pressure is generated near the pumping ring 8, it is actually equivalent to generating local high pressure in the larger annular cavity and generating local low pressure in the smaller annular cavity, thereby realizing the circulation of lubricating coolant.

[0024] The above embodiments describe the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the changes and modifications made by the technicians in this field shall be within the scope of protection of the claims attached to the utility model.

Claims

1. A coolant self-circulating sand pump, characterized in that: The invention comprises a main shaft (3), a mechanical seal pump cover (4) and a sealing seat (6), wherein the main shaft (3) passes through the mechanical seal pump cover (4) and the sealing seat (6), wherein a mechanical seal device (5) and an oil seal (7) are respectively installed on the mechanical seal pump cover (4) and the sealing seat (6), wherein a pumping ring (8) is arranged between the mechanical seal device (5) and the oil seal (7), wherein the pumping ring (8) is fixed on the main shaft (3), and wherein upper and lower ends of the sealing seat (6) are respectively provided with a discharge interface (61) and an access interface (62), wherein the discharge interface (61) is connected to the upper part of the pumping ring (8), and the access interface (62) is connected to the lower part of the side of the pumping ring (8), and when the main shaft (3) and the pumping ring (8) rotate, the discharge interface (61) is in a high-pressure area, while the access interface (62) is in a low-pressure area.

2. A coolant self-circulating sand pump according to claim 1, characterized in that: Two communicating annular cavities are formed between the sealing seat (6) and the main shaft (3), and the pumping ring (8) is located in the larger of the two communicating annular cavities.

3. A coolant self-circulating sand pump according to claim 2, characterized in that: When the pumping ring (8) rotates, the coolant in the annular cavity where the pumping ring (8) is located generates a pressure higher than that in another cavity, so that the coolant generates self-circulating power.

4. A coolant self-circulating sand pump according to claim 1, characterized in that: The mechanical seal device (5) comprises a spring (51), a dynamic ring (52) and a static ring (53); the dynamic ring (52) is in contact with the static ring (53); the spring (51) is arranged on one side of the dynamic ring (52); and the dynamic ring (52) forms a dynamic sealing surface with the static ring (53) under the pressure of the spring (51).

5. A coolant self-circulating sand pump according to claim 2, characterized in that: The mechanical seal device (5) is arranged between the mechanical seal pump cover (4) and the main shaft (3); the oil seal (7) is arranged between the sealing seat (6) and the main shaft (3); and the annular cavity is located between the mechanical seal pump cover (4), the mechanical seal device (5), the sealing seat (6) and the oil seal (7).

6. A coolant self-circulating sand pump according to claim 1, characterized in that: The discharge interface (61) and the access interface (62) are respectively connected to the coolant bottle via pipes to form a coolant circulation passage.

7. A coolant self-circulating sand pump according to claim 1, characterized in that: The pumping ring (8) is provided with a plurality of notches to improve the cooling liquid circulation efficiency.

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