BB1 pump cover

Abstract

The utility model belongs to the technical field of centrifugal pumps, and discloses a BB1 pump cover which comprises a cover body provided with a filler cavity, an impeller cavity and a rotating shaft cavity are arranged in the cover body, the impeller cavity is used for containing an impeller, the rotating shaft cavity is used for containing a rotating shaft, and the filler cavity is communicated with the rotating shaft cavity. A plurality of rib plates are arranged on the cover body, straight holes are formed in the rib plates, one ends of the straight holes are communicated with the impeller cavity, and the other ends of the straight holes are communicated with the filler cavity; the cooling device solves the problems that an existing cooling device for the sealing filler of the pump cover is prone to damage, and the hidden danger of liquid leakage is high.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a BB1 pump cover. Background Art

[0002] The BB1 ​​pump is an axially split 1-stage and 2-stage two-end supported centrifugal pump. The fluid pumped in the pump is usually called the medium, and the most common medium is water. A centrifugal pump is a mechanical device that uses the centrifugal motion of water to pump water. Its main components include the pump casing, pump cover, impeller, pump shaft and pump frame. The working principle of a centrifugal pump is to drive the water to move centrifugally through the high-speed rotating impeller, thereby pumping water from a low place to a high place. Before starting the centrifugal pump, it is necessary to fill the pump with water. After starting, the rotating impeller will drive the water in the pump to rotate at a high speed, generating centrifugal motion. Under the action of centrifugal force, the water is thrown out and pressed into the outlet pipe. When the water is thrown out, the pressure near the impeller will decrease, forming a low-pressure area near the shaft. The pressure of this low-pressure area is much lower than the atmospheric pressure. Therefore, the external water enters the pump through the bottom valve under the action of atmospheric pressure. The water entering the pump is thrown out again during the high-speed rotation of the impeller and is pressed into the outlet pipe.

[0003] The casing and cover of the BB1 ​​pump need to be sealed with the rotating shaft to prevent liquid from flowing out. The existing seal is a packing seal. When a centrifugal pump is sealed with a packing, the packing must be pressed tightly to increase the sealing effect. However, if it is pressed too tightly, the packing is prone to dry grinding and high-temperature burning. Therefore, it is necessary to connect pipes at the high-pressure points on both sides of the pump to connect the liquid in the pump to the middle of the packing to lubricate and cool the packing while ensuring the sealing performance. However, the external pipe is directly exposed to the outside and is easily damaged by bumps during transportation and use. The wall thickness of the external pipe is relatively thin and the service life is short. Each external pipe has two interfaces, which means there are two leakage risks. Utility Model Content

[0004] The utility model aims to provide a BB1 pump cover to solve the problems that the cooling device of the sealing packing of the existing pump cover is easy to be damaged and the potential risk of liquid leakage is high.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The basic technical solution provided by the utility model is:

[0007] A BB1 pump cover comprises a cover body provided with a stuffing cavity, wherein the cover body is provided with an impeller cavity and a rotating shaft cavity, wherein the impeller cavity is used to accommodate an impeller, the rotating shaft cavity is used to accommodate a rotating shaft, and the stuffing cavity is communicated with the rotating shaft cavity; a plurality of ribs are provided on the cover body, and straight holes are opened in the ribs, one end of the straight holes is communicated with the impeller cavity, and the other end of the straight holes is communicated with the stuffing cavity.

[0008] Furthermore, the straight hole includes an upper straight hole and a lower straight hole which are connected to each other, one end of the upper straight hole is connected to the impeller chamber, the other end of the upper straight hole passes through the side wall of the rib plate, and a blocking piece is provided at one end of the upper straight hole away from the impeller chamber; and one end of the lower straight hole away from the upper straight hole is connected to the packing chamber.

[0009] Furthermore, the plugging member is a threaded plug, an end of the upper straight hole away from the impeller chamber is provided with an internal thread, the threaded plug is connected to the upper straight hole via a pipe thread, and a sealing medium is provided at the pipe thread connection.

[0010] Furthermore, the plugging member is a threaded plug, and the threaded plug is connected to the upper straight hole by welding.

[0011] Furthermore, the number of the ribs is two, and the two ribs are symmetrically arranged, and the length direction of the ribs is parallel to the axial direction of the rotating shaft cavity.

[0012] Principles and beneficial effects of basic technical solutions:

[0013] (1) The shaft cavity of the cover body of the utility model is used to install the shaft; the packing cavity of the cover body is used to accommodate the packing, so that the cover body and the shaft are connected through the packing seal to prevent liquid leakage; and the cover body is provided with a rib plate, and a straight hole is provided in the rib plate. The impeller cavity is used to accommodate the impeller, one end of the straight hole is connected to the impeller cavity, and the other end is connected to the packing cavity. When the impeller rotates at high speed, the liquid in the impeller cavity flows into the packing cavity through the straight hole. The packing cavity is provided with a packing ring, and the packing ring distributes the liquid evenly in the circumferential direction, so as to lubricate and cool the packing; the pump cover cancels the external pipe-type cooling that is easy to be damaged, and changes it to the internal drilling mode of the rib plate that is difficult to be damaged; and the added rib plate can increase the strength of the pump cover and improve the pressure bearing capacity, that is, improve the service life of the pump cover; the two leakage points of the original pipe-type are cancelled, and the leakage risk is reduced;

[0014] (2) The straight hole adopts an upper straight hole and a lower straight hole. Two drillings are used during processing. A through hole is drilled from the side wall of the rib plate to the impeller cavity, and then a hole is drilled upward from the packing chamber to the upper straight hole. The processing is convenient, the efficiency is increased, and the cost is saved. A plug is connected to the end of the upper straight hole away from the impeller cavity. If the plug is connected to the cover body by welding, there is no leakage point in the liquid guide flow channel, which further reduces the leakage risk. If the plug is connected to the upper straight hole by a pipe thread, a sealing medium is set at the pipe thread connection to increase the sealing effect. The cooling flow rate can be adjusted by the depth of the plug. If the cooling flow rate needs to be reduced, the plug is screwed deeper to reduce the connection area between the upper straight hole and the lower straight hole, thereby reducing the flow area. If the cooling flow rate needs to be increased, the plug is screwed outward.

[0015] (3) The two ribs are symmetrically arranged, and the length direction of the ribs is parallel to the axial direction of the shaft cavity, which further increases the strength of the pump cover, improves the pressure bearing capacity, and increases the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a BB1 pump cover of the utility model;

[0017] Figure 2 This is a front view of a BB1 pump cover of the utility model;

[0018] Figure 3 for Figure 2 AA view;

[0019] Figure 4 This is a schematic diagram of the structure of a BB1 pump cover and a pump body assembled in the utility model;

[0020] Figure 5 for Figure 4 A partial schematic diagram of

[0021] The names of the corresponding marks in the accompanying drawings are:

[0022] Pump frame 1, pump casing 2, cover body 3, rib 31, upper straight hole 32, thread plug 33, lower straight hole 34, packing cavity 35, packing 4, packing ring 5, rotating shaft 6, impeller 7, impeller cavity 8. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0024] like Figures 1 to 5As shown, a BB1 pump cover comprises a cover body 3 provided with a stuffing cavity 35, and an impeller cavity 8 and a shaft cavity are provided in the cover body 3, the impeller cavity 8 is used to accommodate the impeller 7, the shaft cavity is used to accommodate the shaft 6, and the stuffing cavity 35 is connected with the shaft cavity; two symmetrically arranged ribs 31 are provided on the cover body 3, the length direction of the ribs 31 is parallel to the axial direction of the shaft cavity, and the two ribs 31 are distributed along the axial direction of the shaft cavity; a straight hole is opened in the rib 31, one end of the straight hole is connected with the impeller cavity 8, and the other end of the straight hole is connected with the stuffing cavity 35; in this embodiment, the straight holes include mutually connected An upper straight hole 32 and a lower straight hole 34, one end of the upper straight hole 32 is communicated with the impeller chamber 8, the other end of the upper straight hole 32 is arranged through the side wall of the rib 31, the upper straight hole 32 forms an opening on the side wall of the rib 31, and the end of the lower straight hole 34 away from the upper straight hole 32 is communicated with the packing chamber 35; a plugging piece is provided at the end of the upper straight hole 32 away from the impeller chamber 8, the plugging piece is a thread plug 33, and an internal thread is provided at the end of the upper straight hole 32 away from the impeller chamber 8, the thread plug 33 is connected to the upper straight hole 32 by a pipe thread, and a sealing tape is provided at the pipe thread connection; the thread plug 33 and the upper straight hole 32 can also be connected by welding.

[0025] The specific implementation process is as follows:

[0026] Assemble the pump frame 1, pump casing 2, rotating shaft 6, impeller 7 and pump cover, fill the packing 4 in the packing cavity 35 between the pump cover and the rotating shaft 6, and install the packing ring 5. According to the required liquid flow, adjust the position of the wire plug 33, turn on the power, and the liquid in the impeller cavity 8 flows into the packing cavity 35 through the upper straight hole 32 and the lower straight hole 34, and the liquid is evenly distributed in the circumferential direction through the packing ring 5 to lubricate and cool the packing 4 while ensuring the sealing performance.

[0027] Among them, the shaft cavity of the cover body 3 of the utility model is used to install the shaft 6; the packing cavity 35 of the cover body 3 is used to accommodate the packing 4, so that the cover body 3 and the shaft 6 are sealed and connected through the packing 4 to avoid liquid leakage; and the cover body 3 is provided with a rib 31, and a straight hole is provided in the rib 31, and the impeller cavity 8 is used to accommodate the impeller 7. One end of the straight hole is connected with the impeller cavity 8, and the other end is connected with the packing cavity 35. The impeller 7 rotates at a high speed, and the liquid in the impeller cavity 8 flows into the packing cavity 35 through the straight hole. The packing cavity 35 is equipped with a packing ring 5, and the packing ring 5 distributes the liquid evenly in the circumferential direction, so as to lubricate and cool the packing 4; the pump cover cancels the external pipe-type cooling that is easy to be damaged, and changes it to the internal drilling mode of the rib that is difficult to be damaged; and the added ribs can increase the strength of the pump cover and improve the pressure bearing capacity, that is, improve the life of the pump cover; the two leakage points of the original pipe-type are cancelled to reduce the leakage risk.

[0028] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical scheme or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the technical scheme of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A BB1 pump cover, characterized in that: The invention comprises a cover body (3) provided with a stuffing cavity (35), wherein the cover body (3) is provided with an impeller cavity (8) and a rotating shaft cavity, wherein the impeller cavity (8) is used to accommodate an impeller (7), the rotating shaft cavity is used to accommodate a rotating shaft (6), and the stuffing cavity (35) is communicated with the rotating shaft cavity; the cover body (3) is provided with a plurality of ribs (31), wherein the ribs (31) are provided with straight holes, wherein one end of the straight holes is communicated with the impeller cavity (8), and the other end of the straight holes is communicated with the stuffing cavity (35).

2. The BB1 ​​pump cover according to claim 1, characterized in that: The straight hole comprises an upper straight hole (32) and a lower straight hole (34) which are connected to each other. One end of the upper straight hole (32) is connected to the impeller chamber (8), and the other end of the upper straight hole (32) is arranged to penetrate the side wall of the rib plate (31). A blocking member is arranged at one end of the upper straight hole (32) away from the impeller chamber (8); and one end of the lower straight hole (34) away from the upper straight hole (32) is connected to the packing chamber (35).

3. The BB1 ​​pump cover according to claim 2, characterized in that: The plugging member is a threaded plug (33), an end of the upper straight hole (32) away from the impeller chamber (8) is provided with an internal thread, the threaded plug (33) is connected to the upper straight hole (32) via a pipe thread, and a sealing medium is provided at the pipe thread connection.

4. The BB1 ​​pump cover according to claim 2, characterized in that: The plugging member is a threaded plug (33), and the threaded plug (33) is connected to the upper straight hole (32) by welding.

5. The BB1 ​​pump cover according to claim 1, characterized in that: The number of the ribs (31) is two, and the two ribs (31) are symmetrically arranged, and the length direction of the ribs (31) is parallel to the axial direction of the rotating shaft cavity.

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