阅读说明：本技术 一种用于小体积大流量舰用低硫燃油泵的密封系统 (Sealing system for small-volume large-flow low-sulfur fuel pump for ships ) 是由 路红山 李四娣 朱兵 周睿 刘义军 于 2019-09-27 设计创作，主要内容包括：本发明涉及一种用于小体积大流量舰用低硫燃油泵的密封系统,燃油泵包括泵体、叶轮、压盖和电机,压盖设于泵体顶部,电机设于压盖顶部中心,电机轴穿过压盖的中心通孔伸入泵体内腔中,叶轮套设于电机轴上通过键连接,压盖与泵体的接触面之间设有O型密封圈,电机轴与压盖内壁之间设有骨架橡胶密封圈。本发明解决舰用低硫燃油黏度低,小体积大流量的情况下动密封和静密封防漏问题。(The invention relates to a sealing system for a small-volume large-flow naval low-sulfur fuel pump, which comprises a pump body, an impeller, a gland and a motor, wherein the gland is arranged at the top of the pump body, the motor is arranged at the center of the top of the gland, a motor shaft penetrates through a central through hole of the gland and extends into an inner cavity of the pump body, the impeller is sleeved on the motor shaft and is connected through a key, an O-shaped sealing ring is arranged between the gland and a contact surface of the pump body, and a framework rubber sealing ring is arranged. The invention solves the problems of dynamic sealing and static sealing leakage prevention under the conditions of low viscosity, small volume and large flow of the low-sulfur fuel for ships.)

1. The utility model provides a sealing system that is used for large-traffic naval low sulfur fuel pump of little volume, the fuel pump includes the pump body, impeller, gland and motor, pump body top is located to the gland, gland top center is located to the motor, and the motor shaft passes the central through-hole of gland and stretches into in the pump body inner chamber, through the key-type connection, its characterized in that on the motor shaft is located to the impeller cover: an O-shaped sealing ring is arranged between the contact surface of the gland and the pump body, and a framework rubber sealing ring is arranged between the motor shaft and the inner wall of the gland.

2. The sealing system for the small-volume large-flow marine low-sulfur fuel pump according to claim 1, wherein a shoulder is arranged on the inner wall of the gland, the framework rubber sealing ring is arranged on the shoulder in an interference fit manner, and an outer ring of the framework rubber sealing ring is in pressing contact with the inner wall of the gland.

3. The sealing system for the small-volume high-flow marine low-sulfur fuel pump according to claim 2, wherein an annular groove is formed in the position, located at the top of the framework rubber sealing ring, of the inner wall of the gland in the circumferential direction, and a spring retainer ring is embedded in the groove.

4. The sealing system for the small-volume high-flow marine low-sulfur fuel pump according to claim 3, wherein the outer edge of the spring retainer ring is embedded in the groove, and the bottom of the inner edge abuts against the top of the framework rubber sealing ring.

5. The sealing system for a small volume high flow naval low sulfur fuel pump according to claim 1, wherein the O-ring is made of viton.

Technical Field

The invention belongs to the technical field of oil pump sealing, and particularly relates to a sealing system for a small-volume large-flow marine low-sulfur fuel pump.

Background

The low-sulfur fuel oil for ships has low sulfur content, is used as fuel oil in special fields such as power devices of closed circulation of ships and warships, and provides the requirement for the pump with small volume and large flow for occasions with tight space requirements. Because of the small volume and large flow, a high-speed motor and a pump structure with high pumping efficiency are required to be selected, the axial size of a general mode of adding a coupling to an independent pump body by the motor is longer, and the difficulty of half the length of the traditional configuration mode is higher. The compact structure of the pump and the requirement of small volume and large flow rate enable the pressure fluctuation in a fluid cavity formed by the pump body, the impeller and the gland to be large when the pump works, and the dynamic sealing structure and the material technology aim to solve the problem of leakage prevention. The viscosity of the low-sulfur fuel oil for the warships is low (the sulfur is less than 2ppm, the kinematic viscosity at 20 ℃ is less than 9.0mm2/s), the permeability is strong, a proper dynamic sealing structure and material and a durable and wear-resistant motor shaft are adopted, and a static sealing ring also needs to meet the requirements of solvent resistance and corrosion resistance. The heat dissipation problem of the dynamic seal directly influences the sealing service life of the pump during long-time operation, and therefore the requirement is put forward on the sealing structure of the pump.

Disclosure of Invention

The invention aims to provide a sealing system for a low-sulfur fuel pump for ships with small volume and large flow rate, aiming at the technical requirement.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a sealing system that is used for large-traffic naval low sulfur fuel pump of little volume, the fuel pump includes the pump body, impeller, gland and motor, pump body top is located to the gland, gland top center is located to the motor, and the motor shaft passes the central through-hole of gland and stretches into in the pump body inner chamber, through the key-type connection, its characterized in that on the motor shaft is located to the impeller cover: an O-shaped sealing ring is arranged between the contact surface of the gland and the pump body, and a framework rubber sealing ring is arranged between the motor shaft and the inner wall of the gland.

According to the scheme, the inner wall of the gland is provided with the shoulder, the framework rubber sealing ring is arranged on the shoulder through interference fit, and the outer ring of the framework rubber sealing ring is in compression contact with the inner wall of the gland.

According to the scheme, the inner wall of the gland is located an annular groove is formed in the position, at the top of the framework rubber sealing ring, of the framework rubber sealing ring along the circumferential direction, and a spring retainer ring is embedded in the groove.

According to the scheme, the outer edge of the spring retainer ring is embedded into the groove, and the bottom of the inner edge is abutted against the top of the framework rubber sealing ring.

According to the scheme, the O-shaped sealing ring is made of fluororubber.

The invention has the beneficial effects that: the sealing system for the low-sulfur fuel pump for the warship with small volume and large flow is provided, the sealing between a pump body and a gland is realized by adopting an O-shaped rubber sealing ring for static sealing, the dynamic sealing is realized by adopting a framework rubber sealing ring between the gland and a motor shaft, the sealing effect is good, the sealing problem of the low-sulfur fuel pump for the warship without leakage is solved, and the fuel pump does not need to be soaked in oil for working; a large cavity is reserved between the lower part of the framework seal and the impeller, so that when the pump runs at a high speed, fuel can take away heat of the movable seal part, and the heat dissipation efficiency of the fuel pump is improved.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

FIG. 2 is an enlarged schematic view of a sealing system according to one embodiment of the present invention.

Wherein: 1-a motor; 2-spring retainer ring; 3-a framework rubber sealing ring; 4-motor shaft; 5-O type sealing ring; 6-impeller; a 7-bond; 8-a pump body; 9-pressing cover.

Detailed Description

The embodiments of the present invention will now be described with reference to the accompanying drawings, and the present invention is not limited to the following examples.

As shown in fig. 1 and 2, the sealing system for the small-volume large-flow marine low-sulfur fuel pump comprises a pump body 9, an impeller 6, a gland 10 and a motor 1, wherein the gland is arranged at the top of the pump body, the motor is arranged at the center of the top of the gland, a motor shaft penetrates through a central through hole of the gland and extends into an inner cavity of the pump body, the impeller is sleeved on the motor shaft and is connected with the motor shaft through a key 7, an O-shaped sealing ring 5 is arranged between a contact surface of the gland and the pump body and is made of fluororubber, and a framework rubber sealing ring 3 is arranged between.

Be equipped with the circular bead on the gland inner wall, skeleton rubber seal installs on the circular bead through interference fit, skeleton rubber seal's outer lane and gland inner wall pressing contact, the position that the gland inner wall is located skeleton rubber seal top is equipped with the annular groove along circumference, the embedded spring retainer ring 2 that is equipped with of recess, the outer fringe embedding of spring retainer ring, in the recess, inner edge bottom and skeleton rubber seal's top looks butt, spring retainer ring is used for skeleton rubber seal's fixed and location, be convenient for the precision finishing of gland inside seal face and skeleton rubber seal's dismouting.