BB1 rotor structure

Abstract

The utility model discloses a BB1 rotor structure, which comprises a rotating shaft, two ends of the rotating shaft are provided with shaft shoulders, two ends of the rotating shaft are rotatably connected with bearings, one end of each bearing is abutted against the corresponding shaft shoulder, the other end face of each bearing is connected with a locking piece, the locking piece is connected onto the rotating shaft, and the locking piece comprises a round nut and a lock washer; the middle of the rotating shaft is detachably connected with an impeller, the impeller is sleeved with a pump shell, a closed pump cavity is formed between the pump shell and the impeller, the two ends of the rotating shaft are tightly connected with shaft sleeves, the shaft sleeves are located between the impeller and the bearing, one end of each shaft sleeve is tightly connected with the impeller, and the other end of each shaft sleeve is tightly connected with the pump shell. The other end of the shaft sleeve abuts against the inner ring of the bearing. The problem that a section of a shaft of an existing BB1 pump is exposed outside and is prone to being corroded by pumped liquid is solved, and the situation that a whole rotor is loosened due to the fact that a shaft sleeve nut is loosened is avoided.

Description

Technical Field

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

[0002] The impeller of the BB1 ​​centrifugal pump is usually fixed by the sleeves and sleeve nuts at both ends. The impeller does work on the conveyed liquid, the liquid also does work on the impeller, and the unbalanced force generated by the liquid in the closed cavity around the impeller on the impeller pushes the impeller to move axially. This force is the axial force. Although the impeller of the BB1 ​​pump is theoretically symmetrical and the axial force is completely self-balanced, due to the deviation of processing and casting, a certain axial force will still be generated. Therefore, the shaft, as the core part of the pump, bears all the torque and the axial force of the rotor. The shaft breakage accident is extremely frequent and needs to be protected. In addition to the common clean water, the liquid conveyed by the BB1 ​​pump also has various corrosive liquids. Therefore, the sleeve is installed in the part of the pump cavity where the shaft contacts the conveyed liquid to prevent the shaft from being corroded. The pump usually does not reverse, but it may occasionally reverse. For example, if it stops suddenly, the liquid at the outlet flows back into the pump, thereby driving the pump rotor to reverse; in addition, the motor itself may reverse due to problems such as wrong wiring.

[0003] However, the components currently available on the market for protecting and fixing the shaft usually include a long sleeve + a short sleeve + a sleeve nut, and the long sleeve and the short sleeve are sealed by an O-ring, and the short sleeve and the sleeve nut are sealed by a paper gasket. There are the following defects: (1) A section of the shaft outside the sleeve nut is directly exposed. Whether the shaft seal is a mechanical seal or a packing seal, it will eventually leak and is easily corroded by the liquid leaking from the shaft seal, which will cause stress concentration at the corrosion point and cause it to break; (2) There are as many as three seals. If any of the seals fails, the liquid will leak from the inside of the pump chamber into the gap between the shaft and the sleeve, posing a great risk of leakage; (3) The rotation direction of the sleeve nut is usually opposite to the rotation direction of the shaft. In this way, the sleeve nut will not loosen during normal operation. However, in special circumstances, reverse rotation occurs and the sleeve nut may loosen. Utility Model Content

[0004] The utility model is intended to provide a BB1 rotor structure to solve the problem that a shaft of an existing BB1 pump has a section exposed to the outside and easily corroded by the pumped liquid and to avoid the situation that the shaft sleeve nut is loosened so as to make the whole rotor loose.

[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 rotor structure comprises a rotating shaft with shoulders at both ends, bearings are rotatably connected at both ends of the rotating shaft, one end of the bearing abuts against the shoulder, a locking piece is connected to the other end face of the bearing, and the locking piece is connected to the rotating shaft, the locking piece is a round nut and a stop washer; an impeller is detachably connected to the middle part of the rotating shaft, a pump casing is arranged outside the impeller, a closed pump chamber is formed between the pump casing and the impeller, shaft sleeves are tightly connected at both ends of the rotating shaft, the shaft sleeves are located between the impeller and the bearings, one end of the shaft sleeve is tightly connected to the impeller, and the other end of the shaft sleeve abuts against the inner ring of the bearing.

[0008] Principles of basic technical solutions:

[0009] The sleeve is connected to the rotating shaft, and one end of the sleeve is sealed and connected to the impeller, and the other end is in contact with the bearing, thereby protecting the entire shaft. The other end of the bearing is fixed by a locking piece, which is a round nut and a locking washer for the round nut. Slots are provided at the corresponding positions of the rotating shaft and the round nut. When in use, the washer is installed on the side where the nut is slotted. After tightening, the inner and outer stop ears are bent and placed in the grooves. After the round nut is tightened, the inner and outer ears are respectively bent into axial directions and clamped in the keyway on the shaft and the opening of the round nut, respectively. In this way, the round nut will not loosen due to the rotation of the shaft, and the shaft shoulder, the round nut and the locking washer cooperate with each other to fix the bearing. The sleeve is in contact with the inner ring of the bearing, thereby fixing the sleeve and preventing the sleeve from moving axially.

[0010] The beneficial effects of the basic technical solution are:

[0011] (1) The utility model directly replaces the long shaft sleeve + short shaft sleeve + shaft sleeve nut with an integral shaft sleeve, which greatly reduces the processing cost. The three parts become one part, especially the shaft and the shaft sleeve nut need not be tapped;

[0012] (2) The three original sealing points of the utility model are directly reduced to one, and the most unreliable paper gasket seal between the short sleeve and the sleeve nut is eliminated, reducing the hidden danger of liquid leaking from the pump chamber into the gap between the shaft and the sleeve;

[0013] (3) The utility model eliminates the original sleeve nut and directly presses the sleeve against the bearing, that is, the axial force of the impeller is directly transmitted to the bearing through the sleeve, and the round nut and the round nut are used to fix the entire rotor in the axial direction with a locking washer, which can prevent the rotor from loosening due to a certain degree of reversal, and reduce the risk of rotor loosening caused by reversal under special circumstances;

[0014] (4) The rotating shaft of the utility model is completely protected. Even when conveying corrosive liquids, it is only necessary to use stainless steel for the entire shaft sleeve. The shaft can be made of cheap high-strength alloy steel instead of expensive stainless steel, thereby reducing costs.

[0015] Preferably, a step is provided at one end of the shaft sleeve close to the impeller, and a receiving groove adapted to the step is provided at the connection between the impeller and the rotating shaft, and the step is inserted into the receiving groove.

[0016] Through the above arrangement, the step at the end of the sleeve is inserted into the receiving groove, which further improves the sealing between the sleeve and the rotating shaft; and the receiving groove can also apply a radial tightening force to the rotating shaft, thereby preventing the entire rotor from loosening.

[0017] Preferably, an O-ring is provided at the connection between the shaft sleeve and the accommodating groove.

[0018] Through the above arrangement, the sealing is further increased by setting the O-ring, and the O-ring is easy to obtain and inexpensive, thereby reducing the cost; an O-ring groove is opened on the outer surface of the step of the rotating shaft, and the O-ring is sleeved in the O-ring groove. A part of the O-ring can be fixedly embedded in the O-ring groove, and the other part abuts against the inner wall of the accommodating groove to play a sealing role, and this connection method can protect the O-ring from being damaged during operation.

[0019] Preferably, a liquid-retaining ring is sleeved on the shaft sleeve, and the liquid-retaining ring is located between the pump housing and the bearing end cover.

[0020] Through the above arrangement, the liquid retaining ring further blocks the liquid from flowing to the bearing, thereby better protecting the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a BB1 rotor structure;

[0022] Figure 2 It is a partial structural schematic diagram of a BB1 rotor structure;

[0023] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0024] Figure 4 for Figure 2 Schematic diagram of the enlarged structure at B.

[0025] The names of the corresponding marks in the accompanying drawings are:

[0026] Pump casing 1, impeller 2, O-ring 21, rotating shaft 3, shaft sleeve 4, step 41, bearing 5, stop washer 61, round nut 62, liquid retaining ring 7, bearing box 8, skeleton oil seal 81, bearing gland 9. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0028] like Figure 1 to Figure 2 As shown, a BB1 rotor structure comprises a rotating shaft 3 with shaft shoulders at both ends, bearings 5 ​​are rotatably connected at both ends of the rotating shaft 3, one end of the bearing 5 abuts against the shaft shoulder, and the other end face of the bearing 5 is connected with a locking piece, and the locking piece is connected to the rotating shaft 3, the locking piece is a round nut 62 and a stop washer 61 threadedly connected to the rotating shaft 3, and the stop washer 61 is located between the round nut 62 and the bearing 5; wherein, a bearing box 8 is externally connected to the bearing 5, and the side of the bearing box 8 close to the round nut 62 is connected to the rotating shaft 3 through a skeleton oil seal 81, and a bearing pressure cover 9 is threadedly connected to the bearing 5 box, the bearing pressure cover 9 covers the end face of the bearing 5 close to the impeller 2, and the bearing pressure cover 9 and the shaft sleeve 4 are connected through a skeleton oil seal 81. The impeller 2 is detachably connected to the middle part of the rotating shaft 3, and the outer cover of the impeller 2 is connected to the pump casing 1, which is installed on the support seat. A closed pump chamber is formed between the pump casing 1 and the impeller 2. The two ends of the rotating shaft 3 are tightly connected with shaft sleeves 4, and the shaft sleeve 4 is located between the impeller 2 and the bearing 5. A step 41 is provided at one end of the shaft sleeve 4 close to the impeller 2, and a receiving groove adapted to the step 41 is provided at the connection between the impeller 2 and the rotating shaft 3. The step 41 is inserted in the receiving groove, and an O-ring 21 is provided at the connection between the shaft sleeve 4 and the receiving groove. The other end of the shaft sleeve 4 abuts against the inner ring of the end face of the bearing 5 close to the shaft shoulder; a liquid retaining ring 7 is sleeved on the shaft sleeve 4, and the liquid retaining ring 7 is located between the pump casing 1 and the bearing 5.

[0029] Among them, the utility model directly replaces the long shaft sleeve + short shaft sleeve + shaft sleeve nut with an integral shaft sleeve, which greatly reduces the processing cost, and the three parts become one part, especially the shaft and shaft sleeve nut need to be tapped; the original three sealing points of the utility model are directly reduced to one, and the most unreliable paper gasket seal between the short shaft sleeve and the shaft sleeve nut is eliminated, reducing the hidden danger of liquid leaking from the inside of the pump chamber into the gap between the shaft and the shaft sleeve; the utility model eliminates the original shaft sleeve nut, and directly presses the shaft sleeve on the bearing, that is, the axial force of the impeller is directly transmitted to the bearing through the shaft sleeve, and the whole rotor is fixed axially by the round nut and the round nut with a locking washer, which can prevent the rotor from loosening caused by a certain degree of reversal, and reduce the hidden danger of rotor loosening caused by reversal under special circumstances; the rotating shaft of the utility model is completely protected, even if corrosive liquids are transported, it is only necessary to use stainless steel for the integral shaft sleeve, and the shaft can be made of cheap and high-strength alloy steel instead of expensive stainless steel, thereby reducing costs.

[0030] 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 rotor structure, characterized in that: The invention comprises a rotating shaft (3) with shaft shoulders at both ends, bearings (5) being rotatably connected at both ends of the rotating shaft (3), one end of the bearing (5) being in contact with the shaft shoulder, a locking piece being connected to the other end face of the bearing (5), and the locking piece being connected to the rotating shaft (3), the locking piece being a round nut (62) and a stop washer (61); an impeller (2) being detachably connected at the middle part of the rotating shaft (3), a pump casing (1) being arranged on the outer sleeve of the impeller (2), a closed pump chamber being formed between the pump casing (1) and the impeller (2), sleeves (4) being tightly connected at both ends of the rotating shaft (3), the sleeves (4) being located between the impeller (2) and the bearing (5), one end of the sleeve (4) being tightly connected to the impeller (2), and the other end of the sleeve (4) being in contact with the inner ring of the bearing (5).

2. A BB1 rotor structure according to claim 1, characterized in that: A step (41) is provided at one end of the shaft sleeve (4) close to the impeller (2), and a receiving groove adapted to the step (41) is provided at the connection between the impeller (2) and the rotating shaft (3), and the step (41) is inserted into the receiving groove.

3. A BB1 rotor structure according to claim 2, characterized in that: An O-ring (21) is provided at the connection between the shaft sleeve (4) and the accommodating groove.

4. A BB1 rotor structure according to claim 1, characterized in that: A liquid retaining ring (7) is sleeved on the shaft sleeve (4), and the liquid retaining ring (7) is located between the pump housing (1) and the bearing (5).

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