CN211779185U - One-way throttle valve joint for mechanical seal washing water for pump - Google Patents

Abstract

The utility model relates to a one-way throttle valve joint of mechanical seal washing water for pump, which is suitable for the occasion that the balanced mechanical seal needs to control the pressure of the seal washing water, the throttle valve water pipe joint is of a hollow structure, the big joint is connected with the big end of the throttle valve body through threads, a valve cavity is arranged in the big end of the throttle valve body, and the upper end of the valve cavity is communicated with the hollow structure of the throttle valve water pipe joint; a throttle valve core is arranged in the valve cavity, and a through groove is arranged between the throttle valve core and the wall of the valve cavity; a small through hole is formed in the center of the throttle valve core; the other end of the throttle valve body is a small end, a passage is arranged in the small end and is communicated with the valve cavity at the large end, and the diameter of the passage is smaller than that of the valve cavity; a plug is arranged at one end of the throttle valve core, which faces the small end of the throttle valve body, and is plugged on the channel; the small through hole penetrates through the plug. The utility model discloses the sealed sparge water of control gets into the volume in sealed chamber, but the sparge water discharge is unrestricted again, can effectively prolong mechanical seal life.

Description

One-way throttle valve joint for mechanical seal washing water for pump

Technical Field

The utility model relates to a pump is with one-way choke valve joint of mechanical seal sparge water is applicable to the occasion that balanced type mechanical seal needs the sealed sparge water pressure of control.

Background

The mechanical seal of the water pump is installed on main shaft and pump case, the prior art mainly includes main shaft, bearing box, bearing end cover, mechanical seal and pump case impeller, etc., the mechanical seal mainly plays the role that the liquid that the pump delivers does not leak to the outside, there are rotating ring, stationary ring and compression spring in the mechanical seal assembly, when the main shaft rotates and operates, rotating ring and stationary ring are in close contact together under the effect of spring, play a sealed role, another side of the mechanical seal is the rubber oil seal, the lip of the oil seal contacts with main shaft excircle, prevent the flushing water from leaking. However, the pressure and the flow of flushing water on the user site are often very large, as shown in fig. 4, a large amount of sealing flushing water directly flushes into the sealing cavity and cannot be discharged in time, when the pressure is greater than a certain value, the abrasion of the dynamic and static rings is aggravated, the lip of the rubber oil seal is rapidly abraded under the condition of overlarge pressure, the sealing is disabled, the liquid and the flushing water in the pump cavity are leaked, and even the main shaft and the impeller are scrapped in severe cases.

Disclosure of Invention

To prior art not enough, the utility model aims to provide a pump is with one-way choke valve joint of mechanical seal sparge water, restriction flow when the wash water gets into promptly, unrestricted during the discharge, and what connects on one set of sealing in addition can exchange as import or export, prevents that the user from connecing back flush water pipe and damaging sealedly.

In order to achieve the above purpose, the utility model adopts the following scheme:

the one-way throttle valve joint of mechanically sealed washing water for the pump comprises a throttle valve water pipe joint, a throttle valve body and a throttle valve core; the throttle valve water pipe joint is of a hollow structure, one end of the throttle valve water pipe joint is a small joint, the other end of the throttle valve water pipe joint is an external large joint, the large joint is connected with the large end of the throttle valve body through threads, and a rubber sealing ring is arranged between the large joint and the large end of the throttle valve body;

a valve cavity is arranged in the large end of the throttle valve body, and the upper end of the valve cavity is communicated with the hollow structure of the throttle valve water pipe joint; a throttle valve core is arranged in the valve cavity and is in sliding connection with the wall of the valve cavity; a through groove is arranged between the valve core of the throttle valve and the wall of the valve cavity; a small through hole is formed in the center of the throttle valve core;

the other end of the throttle valve body is a small end, a passage is arranged in the small end, the passage is communicated with the valve cavity at the large end, and the diameter of the passage is smaller than that of the valve cavity; a plug is arranged at one end of the throttle valve core, which faces the small end of the throttle valve body, and is plugged on the channel; the small through hole penetrates through the plug.

The utility model provides a pump is with one-way throttle valve joint of mechanical seal sparge water, the sealed sparge water of control gets into the volume in sealed chamber, but the sparge water discharge is unrestricted again, can effectively prolong mechanical seal life.

Drawings

Fig. 1 is a schematic sectional structure of the present invention;

FIG. 2 is one of the modes of use of the embodiment;

FIG. 3 illustrates a second embodiment;

fig. 4 is a schematic diagram of a prior art structure.

Detailed Description

The specific technical solution of the present invention will be described with reference to the embodiments.

As shown in fig. 1, the one-way throttle valve joint for mechanically sealed washing water for pumps comprises a throttle valve water pipe joint 1, a throttle valve body 4 and a throttle valve core 3;

the throttle valve water pipe joint 1 is of a hollow structure, one end of the throttle valve water pipe joint is a small joint, the other end of the throttle valve water pipe joint is an external large joint, the large joint is connected with the large end of the throttle valve body 4 through threads, and a rubber sealing ring 2 is arranged between the large joint and the large end of the throttle valve body 4;

a valve cavity is arranged in the large end of the throttle valve body 4, and the upper end of the valve cavity is communicated with the hollow structure of the throttle valve water pipe joint 1; a throttle valve core 3 is arranged in the valve cavity, and the throttle valve core 3 is in sliding connection with the wall of the valve cavity; a through groove is arranged between the throttle valve core 3 and the wall of the valve cavity; a small through hole 5 is formed in the center of the throttle valve core 3;

the other end of the throttle valve body 4 is a small end, a passage is arranged in the small end, the passage is communicated with the valve cavity at the large end, and the diameter of the passage is smaller than that of the valve cavity; a plug is arranged at one end of the throttle valve core 3 facing the small end of the throttle valve body 4 and is plugged on the channel; the small through hole 5 penetrates through the plug.

The throttle valve core 3 is movable, when water flows from the throttle valve water pipe joint 1 to the throttle valve body 4, the throttle valve core 3 is pushed to the small end of the throttle valve body 4, the plug blocks the connection part of the valve cavity of the throttle valve body 4 and the small end channel, and water flows into the small end channel of the throttle valve body 4 from the small through hole 5 in the center of the throttle valve core 3 in a limited amount; on the contrary, when the water flow is from the throttle valve body 4 to the throttle valve water pipe joint 1, the throttle valve core 3 moves to the throttle valve water pipe joint 1 under the action of the water flow, the connection part of the valve cavity of the throttle valve body 4 and the channel of the small end is opened, and the water passes through the small hole in the center of the throttle valve core 3 and the through groove on the excircle of the throttle valve core 3 in a full amount; thereby the sealing flushing water enters from the small caliber to the large caliber and the pressure of the sealing cavity 6 is prevented from exceeding the standard. As shown in fig. 2 and 3, the whole structure is provided with two throttle valves on the sealing cavity 6, wherein one of the throttle valves is used as an inlet of sealing washing water, and the other throttle valve is automatically switched to a washing water outlet, so that the structure is simple, but the service life of the sealing can be effectively prolonged.

Claims (1)

1. The one-way throttle valve joint of mechanical seal washing water for the pump is characterized by comprising a throttle valve water pipe joint, a throttle valve body and a throttle valve core;

the throttle valve water pipe joint is of a hollow structure, one end of the throttle valve water pipe joint is a small joint, the other end of the throttle valve water pipe joint is an external large joint, the large joint is connected with the large end of the throttle valve body through threads, and a rubber sealing ring is arranged between the large joint and the large end of the throttle valve body;

a valve cavity is arranged in the large end of the throttle valve body, and the upper end of the valve cavity is communicated with the hollow structure of the throttle valve water pipe joint; a throttle valve core is arranged in the valve cavity and is in sliding connection with the wall of the valve cavity; a through groove is arranged between the valve core of the throttle valve and the wall of the valve cavity; a small through hole is formed in the center of the throttle valve core;

the other end of the throttle valve body is a small end, a passage is arranged in the small end, the passage is communicated with the valve cavity at the large end, and the diameter of the passage is smaller than that of the valve cavity; a plug is arranged at one end of the throttle valve core, which faces the small end of the throttle valve body, and is plugged on the channel; the small through hole penetrates through the plug.

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