Sealing structure of liquid lift pump

Abstract

According to the sealing structure of the liquid lift pump, a sealing ring is fixed to the center of a pump base, a pump shaft is sleeved with a shaft sleeve, and the shaft sleeve is fixedly connected with the pump shaft and can rotate along with the pump shaft; the liquid sealing piece is arranged at one end, close to the sealing ring, of the shaft sleeve and can also rotate along with the shaft sleeve, and one end of the liquid sealing piece is partially arranged at the inner ring of the sealing ring and attached to the inner ring surface of the sealing ring; the liquid sealing piece is an elastic body, and the end of the liquid sealing piece can be tightly attached to the inner ring face of the sealing ring under the action of rotating centrifugal force. The sealing ring is a high-aluminum ceramic ring, and the liquid sealing piece is a fluororubber sealing piece. According to the sealing structure of the liquid lift pump, through cooperation of the sealing ring, the shaft sleeve and the liquid sealing piece, when the liquid lift pump operates, tight sealing can be achieved at the gap between the root of the pump shaft and the pump base, the higher the rotating speed of the pump shaft is, the better sealing effect is achieved, liquid can be effectively prevented from entering a machine body, and the service life of the liquid lift pump is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of machine pump equipment, and in particular relates to a sealing structure of a liquid lifting pump. Background Art

[0002] A liquid lifting pump is a pump product that integrates a pump, a pump machine, a housing, and a control system. It can be used to lift various liquids in industrial production, such as the tank liquid in a steel wire surface treatment production line and the treatment liquid on a Zn or Cu plating production line, etc. It can work on the ground or underwater. The present application relates to a liquid lifting pump that works on the ground, which is a lifting pump for the tank liquid in a steel wire surface treatment production line, and is used to lift acidic and alkaline liquids. The body of the liquid lifting pump is installed on an equipment platform on the liquid surface for easy repair and maintenance. The long shaft, impeller, and casing extend below the liquid surface, and the liquid is lifted and extracted along the casing under the action of the impeller.

[0003] Although most of the body of the liquid lifting pump is located above the liquid surface, with only the long axis placed below the liquid surface, the lifted liquid will also enter the body along the gap between the root of the long axis and the pump seat. Over time, this can easily cause corrosion and damage to the internal parts of the body. Utility Model Content

[0004] Based on the content in the background technology, the utility model provides a sealing structure of a liquid lift pump, which can well achieve tight sealing at the gap between the root of the pump shaft and the pump seat when the liquid lift pump is in operation.

[0005] A sealing structure of a liquid lifting pump, comprising a sealing ring, a pump seat, a shaft sleeve, a pump shaft and a liquid sealing member;

[0006] The sealing ring is fixed at the center of the pump seat. Of course, the pump shaft passes through the sealing ring and the pump seat and is connected to the motor. The shaft sleeve is sleeved on the pump shaft and is fixedly connected to the pump shaft and can rotate with the pump shaft.

[0007] The liquid seal is arranged on the side of the shaft sleeve close to the sealing ring. Of course, the liquid seal is also annular and is also sleeved on the pump shaft. The liquid seal is fixedly connected to the shaft sleeve or has an interference fit, and can also rotate with the shaft sleeve. One end of the liquid seal is placed on the inner ring of the sealing ring and fits with the inner ring surface of the sealing ring. The liquid seal is an elastomer, which can "expand" under the action of the centrifugal force of rotation so that its end can fit closely with the inner ring surface of the sealing ring, so as to achieve a sealing effect at the gap between the root of the pump shaft and the pump seat, and the faster the pump shaft rotates, the better the sealing effect.

[0008] Preferably, the sealing ring is a high-aluminum ceramic ring with a smooth surface, which can reduce the friction loss when the liquid seal contacts it. The liquid seal is a fluororubber seal, which can "expand" under the centrifugal force of rotation, can better fit closely with the inner ring surface of the sealing ring, and is resistant to high temperature and corrosion. The sleeve is made of PPS, which is harder and more corrosion-resistant than conventional materials, and the pump seat is made of ABS.

[0009] Preferably, a shaft sleeve and a pump shaft are fixedly connected in the following manner: screw holes are respectively provided on the shaft sleeve and the pump shaft, and bolts are screwed into the two screw holes to fasten the shaft sleeve and the pump shaft together. A rubber sleeve is provided at the screw hole of the shaft sleeve, i.e., the position where the bolt is screwed in, to prevent the bolt from directly contacting the outside world and rusting.

[0010] Furthermore, a convex ring is integrally provided on the outer surface of the liquid seal, and the convex ring fits with the end surface of the sealing ring, thereby further improving the sealing effect.

[0011] Through the above technical solution, the utility model at least includes the following beneficial effects:

[0012] The sealing structure of the liquid lift pump described in the present application, through the cooperation of the sealing ring, the bushing and the liquid seal, can achieve tight sealing in the gap between the root of the pump shaft and the pump seat when the liquid lift pump is running. The faster the pump shaft rotates, the better the sealing effect is, which can effectively prevent liquid from entering the fuselage and extend the service life of the liquid lift pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an overall structural diagram of a liquid lift pump described in an embodiment of the present application;

[0014] Figure 2 for Figure 1 The enlarged view of A in the middle is a schematic diagram of the sealing structure of the liquid lift pump;

[0015] Figure 3 Schematic diagram of the matching of the shaft sleeve and the liquid seal on the pump shaft in the embodiment of the present application (B in the figure is the end of the liquid seal that can fit tightly with the inner ring surface of the sealing ring); DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the structures related to the present invention.

[0017] In the description of this application, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship are only used for exemplary description and cannot be understood as limiting this patent; if there are terms such as "first", "second", etc., they are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the said features. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0018] In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0019] refer to Figures 1 to 3 A sealing structure of a liquid lifting pump, comprising a sealing ring 1, a pump seat 2, a shaft sleeve 3, a pump shaft 4 and a liquid sealing member 5;

[0020] The sealing ring 1 is fixed at the center of the pump seat 2. Of course, the pump shaft 4 passes through the sealing ring 1 and the pump seat 2 and is connected to the motor. The shaft sleeve 3 is sleeved on the pump shaft 4 and is fixedly connected to the pump shaft 4 and can rotate with the pump shaft 4.

[0021] The liquid seal 5 is arranged on the side of the shaft sleeve 3 close to the sealing ring 1. Of course, the liquid seal 5 is also annular and is also sleeved on the pump shaft 4. The liquid seal 5 is fixedly connected or interference fit with the shaft sleeve 3 and can also rotate with the shaft sleeve 3. One end of the liquid seal 5 is placed on the inner ring of the sealing ring 1 and fits with the inner ring surface of the sealing ring 1 ( Figure 3 Point B is the end of the liquid seal 5 that can fit with the inner ring surface of the sealing ring 1); the liquid seal 5 is an elastomer, which can "expand" under the action of the rotating centrifugal force so that its end can fit closely with the inner ring surface of the sealing ring 1, thereby achieving a sealing effect at the gap between the root of the pump shaft 4 and the pump seat 2, and the faster the rotation speed of the pump shaft 4, the better the sealing effect.

[0022] The sealing ring 1 is a high-aluminum ceramic ring with a smooth surface, which can reduce the friction loss when the liquid seal 5 contacts it. The liquid seal 5 is a fluororubber seal, which can "expand" under the centrifugal force of rotation, can better fit closely with the inner ring surface of the sealing ring 1, and is resistant to high temperature and corrosion. The shaft sleeve 3 is made of PPS, which is harder and more corrosion-resistant than conventional materials, and the pump seat 2 is made of ABS.

[0023] refer to Figure 2 and Figure 3 The fixing connection method of the above-mentioned shaft sleeve 3 and the pump shaft 4 is as follows: screw holes 8 are respectively provided on the shaft sleeve 3 and the pump shaft 4, and bolts are screwed into the two screw holes 8 to fasten the shaft sleeve 3 and the pump shaft 4. The shaft sleeve 3 is provided with a rubber sleeve 6 at the screw hole 8, that is, the position where the bolt is screwed in, to prevent the bolt from directly contacting the outside world and rusting.

[0024] refer to Figure 2 or Figure 3 The outer surface of the liquid seal 5 is also integrally provided with a convex ring 7, and the convex ring 7 is in contact with the end surface of the sealing ring 1, so as to further improve the sealing effect.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Based on the present invention and the above description, relevant personnel can make various changes and modifications without departing from the technical idea of ​​the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing structure for a liquid lift pump, characterized in that: It comprises a sealing ring (1), a pump seat (2), a shaft sleeve (3), a pump shaft (4) and a liquid sealing member (5); The sealing ring (1) is fixed at the center of the pump seat (2); the shaft sleeve (3) is sleeved on the pump shaft (4) and is fixedly connected to the pump shaft (4) and can rotate with the pump shaft (4); The liquid seal (5) is arranged on a side of the shaft sleeve (3) close to the sealing ring (1) and can rotate along with the shaft sleeve (3). One end of the liquid seal (5) is placed on the inner ring of the sealing ring (1) and fits with the inner ring surface of the sealing ring (1). The liquid seal (5) is an elastic body, and its end can fit tightly with the inner ring surface of the sealing ring (1) under the action of the centrifugal force of rotation.

2. A sealing structure for a liquid lift pump according to claim 1, characterized in that: The sealing ring (1) is a high-aluminum ceramic ring, and the liquid sealing component (5) is a fluororubber sealing component.

3. A sealing structure for a liquid lift pump according to claim 1 or 2, characterized in that: The shaft sleeve (3) and the pump shaft (4) are respectively provided with screw holes (8), and bolts are screwed into the two screw holes (8) to fasten the shaft sleeve (3) and the pump shaft (4). The shaft sleeve (3) is provided with a rubber sleeve (6) at the screw holes (8), i.e., at the positions where the bolts are screwed into.

4. A sealing structure for a liquid lift pump according to claim 1 or 2, characterized in that: The outer surface of the liquid seal (5) is also integrally provided with a convex ring (7), and the convex ring (7) is in contact with the end surface of the sealing ring (1).

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