Horizontal water pump shaft support structure

Abstract

The utility model provides a horizontal water pump pump shaft support structure belongs to water pump technical field. It solved the problem that the existing water pump structure stability is poor. In the utility model, the water pump includes the pump body and the support seat of fixed in the pump body back side and the barrel shape, is horizontally equipped with the pump shaft in the support seat, and the pump shaft front end stretches into the pump body, and the pump shaft is rotatably arranged on the pump body through the first bearing, and the support seat back side is horizontally equipped with the input shaft, and the input shaft rear end is formed with the gear, and the pump shaft rear end is axially provided with the slot, and the input shaft front end inserts the slot, and the input shaft and the pump shaft are connected through the spline fit, be equipped with the locating sleeve between the support seat and the gear, the locating sleeve is sleeved in the input shaft outside and both are rotatably matched through the second bearing, the annular flange is formed on the outside wall of locating sleeve, and the annular flanne is detachably fixed with the support seat through a circle horizontally arranged bolt. The horizontal water pump pump shaft support structure structure is stable.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, and relates to a horizontal water pump, and more particularly to a horizontal water pump shaft support structure. Background Technology

[0002] A horizontal water pump is a device that uses centrifugal force generated by the high-speed rotation of an impeller to transport liquids. It is widely used in industrial, agricultural, and municipal applications. Its structure is illustrated in a centrifugal freshwater pump disclosed in the Chinese Patent Database (application number: 202111449684.X), which includes a volute, an impeller, a pump shaft, a drive gear, and an inlet end cover. The impeller is mounted on one end of the pump shaft and located within the volute. The other end of the pump shaft extends out of the volute and is fitted with a drive gear. This drive gear forms a gear pair with the gear system of a diesel engine, driving the pump. The water pump operates; its characteristic is that it is further provided with a set of water-cooled bearings; the water-cooled bearings are installed in an inner hole in the volute cavity on one side of the impeller, and a retaining ring is provided at the opening of the hole to axially limit the outer ring of the water-cooled bearing, and the end face of the outer ring of the bearing is close to the bottom surface of the inner hole; the water pump shaft has a stepped outer circle, the inner ring of the water-cooled bearing is installed on this stepped outer circle and close to the end face of the step, and the other end of the water-cooled bearing is pressed against the impeller by a locking nut, which also presses against the inner ring of the bearing, thereby forming a positioning structure for the water-cooled bearing in the inner cavity on one side of the impeller.

[0003] In the aforementioned freshwater pump, the drive gear is secured by only a locking nut, essentially relying on the friction between the threaded joints for self-locking. However, under impact, vibration, or variable loads, this friction can easily decrease or disappear, causing the nut to gradually loosen and affecting the normal operation of the pump. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a structurally stable horizontal water pump shaft support structure.

[0005] The objective of this utility model can be achieved through the following technical solution: A horizontal water pump shaft support structure, the water pump including a pump body and a cylindrical support base fixed to the rear side of the pump body, a pump shaft horizontally arranged inside the support base, the front end of the pump shaft extending into the pump body, and the pump shaft rotatably mounted on the pump body through a first bearing, characterized in that an input shaft is horizontally arranged on the rear side of the support base, and a gear is formed at the rear end of the input shaft, a slot is axially opened at the rear end of the pump shaft, the front end of the input shaft is inserted into the slot, and the input shaft and the pump shaft are connected by a spline engagement; a positioning sleeve is provided between the support base and the gear, the positioning sleeve is sleeved outside the input shaft and the two are rotatably engaged by a second bearing; an annular flange coaxial with the positioning sleeve is formed on the outer wall of the positioning sleeve, and the annular flange is detachably fixed to the support base by a ring of horizontally arranged bolts.

[0006] The input shaft, bearing, and positioning sleeve form a modular unit, which is detachably fixed to the support base with bolts. This allows the unit to be removed for repair or replacement by unscrewing the bolts, facilitating subsequent maintenance.

[0007] The input shaft is detachably fixed to the support base by means of a ring of bolts. Compared with the existing technology where the drive gear is locked by only a nut, it can significantly improve the ability to maintain preload and prevent loosening under dynamic loads such as vibration and impact. This significantly improves the stability of the connection between the input shaft and the pump shaft and ensures the stable operation of the water pump.

[0008] In the aforementioned horizontal water pump shaft support structure, the annular flange has axially penetrating through holes, the number of which is the same as the number of bolts, and the shank of each bolt passes through the corresponding through hole; the annular flange extends backward from the through hole to form a protective ring, the number of which is the same as the number of through holes and their positions correspond one-to-one, and the head of each bolt is completely within the corresponding protective ring to protect the bolt head from external impact, ensure bolt tightening strength, and improve structural stability.

[0009] In the above-mentioned horizontal water pump shaft support structure, the inner diameter of the retaining ring is larger than the outer diameter of the bolt head, and there is an annular gap between the retaining ring and the corresponding bolt head to reduce the force transmitted to the bolt when the retaining ring is impacted.

[0010] In the above-mentioned horizontal water pump shaft support structure, an internally threaded pipe is horizontally formed on the outer wall of the support seat, and the internally threaded pipe is located between the support seat and the annular flange; the number of internally threaded pipes and bolts are the same and in the same position, and the bolt shank is screwed into the corresponding internally threaded pipe.

[0011] In the aforementioned horizontal water pump shaft support structure, the internally threaded pipe presses against the front end face of the annular flange. The annular flange, the internally threaded pipe, and the retaining ring together form a cavity to fully accommodate the bolts, thus providing better protection for them.

[0012] In the above-mentioned horizontal water pump shaft support structure, an annular stepped groove is provided on the front end face of the support base, and the stepped groove is composed of a stepped side wall and a stepped bottom wall; a guide ring matching the stepped groove is formed on the front end face of the positioning sleeve, and the guide ring is inserted into the stepped groove for installation guidance of the support base, which facilitates assembly.

[0013] In the above-mentioned horizontal water pump shaft support structure, the stepped sidewall is a tapered shape with a diameter that gradually increases from front to back. A tapered surface is correspondingly formed on the outer wall of the guide ring, and the tapered surface is attached to the stepped sidewall to forcibly correct the coaxiality of the positioning sleeve and the support seat, thereby improving the transmission accuracy of the input shaft and the pump shaft.

[0014] Compared with existing technologies, this horizontal water pump shaft support structure has the following advantages: 1. The input shaft is detachably fixed to the support base by means of a ring of bolts. Compared with the existing technology where the drive gear is only locked by a nut, it can significantly improve the ability to maintain preload and prevent loosening under dynamic loads such as vibration and impact. This significantly improves the stability of the connection between the input shaft and the pump shaft and ensures the stable operation of the water pump.

[0015] 2. The annular flange, the internally threaded pipe, and the retaining ring together form a cavity to fully accommodate the bolt, thus providing better protection for the bolt. Attached Figure Description

[0016] Figure 1 This is a 3D schematic diagram of a horizontal water pump.

[0017] Figure 2 This is a cross-sectional schematic diagram of a horizontal water pump.

[0018] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0019] In the diagram, 1 is the pump body; 1a is the bracket; 2 is the support base; 2a is the internally threaded pipe; 2b is the stepped groove; 3 is the pump shaft; 3a is the slot; 4 is the impeller; 5 is the first bearing; 6 is the input shaft; 6a is the gear; 7 is the positioning sleeve; 7a is the annular flange; 7b is the retaining ring; 7c is the guide ring; 7d is the conical surface; 8 is the second bearing; and 9 is the bolt. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] like Figure 1 As shown, in the horizontal water pump shaft support structure, the water pump includes a pump body 1 and a cylindrical support base 2 fixed to the rear side of the pump body 1. In the actual product, a bracket 1a is formed on the rear side of the pump body 1, the front end of the support base 2 presses against the bracket 1a, and the support base 2 is fixed to the bracket 1a by a ring of screws.

[0022] in, A pump shaft 3 is horizontally mounted inside the support base 2, and the pump shaft 3 and the support base 2 are coaxially arranged. The front end of the pump shaft 3 extends into the pump body 1 and is fixedly connected to an impeller 4 installed inside the pump body 1. The pump shaft 3 is rotatably mounted on the pump body 1 via a first bearing 5, and the first bearing 5 is located outside the pump body 1. Specifically, the bracket 1a has an annular positioning step, and the positioning step is coaxially arranged with the pump shaft 3. The first bearing 5 is located in the positioning step and is a ball bearing. The first bearing 5 includes an inner ring and an outer ring, and the inner ring and outer ring are fixedly connected to the pump shaft 3 and the side wall of the positioning step, respectively. In the actual product, a mechanical seal is also fitted on the pump shaft 3, and the two ends of the mechanical seal act on the inner ring of the first bearing 5 and the inner wall of the support base 2, respectively. The structure and installation method of the mechanical seal are existing, and can be found in a centrifugal freshwater pump disclosed in the Chinese Patent Database (application number: 202111449684.X), which will not be elaborated here.

[0023] like Figure 2 As shown, an input shaft 6 is horizontally positioned on the rear side of the support base 2, and the input shaft 6 and the pump shaft 3 are coaxially arranged. A gear 6a is formed at the rear end of the input shaft 6, and the gear 6a and the input shaft 6 are coaxially arranged and are an integral structure. A slot 3a is axially formed at the rear end of the pump shaft 3, and the front end of the input shaft 6 is inserted into the slot 3a. The input shaft 6 and the pump shaft 3 are connected by a spline fit. Specifically, a keyway is axially formed on the side wall of the slot 3a, and a key block matching the keyway is formed on the front side wall of the input shaft 6. The number of key blocks and keyways are the same and their positions correspond one-to-one. Each key block is inserted into the corresponding keyway to form a stable circumferential fit between the input shaft 6 and the pump shaft 3.

[0024] A positioning sleeve 7 is provided between the support base 2 and the gear 6a. The positioning sleeve 7 is located outside the support base 2 and is coaxial with the support base 2. The positioning sleeve 7 is fitted over the input shaft 6 and the two are rotatably engaged by a second bearing 8, which is located inside the positioning sleeve 7. An annular flange 7a, coaxial with the positioning sleeve 7, is formed on the outer wall of the positioning sleeve 7. The annular flange 7a is detachably fixed to the support base 2 by a ring of horizontally arranged bolts 9, with the bolt heads facing rearward.

[0025] The input shaft 6, bearing and positioning sleeve 7 form a modular whole, and the whole is detachably fixed to the support base 2 by bolts 9. Thus, the whole can be removed for repair or replacement by removing bolts 9, which facilitates subsequent maintenance.

[0026] The input shaft 6 is detachably fixed to the support base 2 by means of a ring of bolts 9. Compared with the prior art where the drive gear 6a is only locked by a nut, it can significantly improve the ability to maintain preload and prevent loosening under dynamic loads such as vibration and impact. This significantly improves the stability of the connection between the input shaft 6 and the pump shaft 3, ensuring the stable operation of the water pump.

[0027] In this embodiment, The installation method of the second bearing 8 is as follows: The second bearing 8 is also a ball bearing, and it includes an inner ring and an outer ring. The inner ring of the second bearing 8 is fixedly connected to the input shaft 6, and the outer ring is fixedly connected to the positioning sleeve 7. Preferably, both the inner and outer rings of the second bearing 8 are fixedly connected to the input shaft 6 and the positioning sleeve 7 respectively by an interference fit. Further, the rear end of the inner ring and the front end of the outer ring press against the support 2 and the input shaft 6 respectively, thereby axially positioning the second bearing 8 and improving the rotational stability of the input shaft 6.

[0028] like Figure 2 and Figure 3 As shown, the installation method of bolt 9 is as follows: the annular flange 7a has an axially through hole, the number of which is the same as the number of bolts 9, and the shank of each bolt 9 passes through the corresponding through hole; the head of bolt 9 is pressed against the rear end face of the annular flange 7a, and an internally threaded tube 2a is horizontally formed on the outer wall of the support 2, and the internally threaded tube 2a is located between the support 2 and the annular flange 7a; the number and position of the internally threaded tube 2a are the same as those of bolt 9, and the shank of bolt 9 is screwed into the corresponding internally threaded tube 2a.

[0029] To further explain, the annular flange 7a extends rearward from the through-hole to form a retaining ring 7b. The number of retaining rings 7b and the positions of the through-holes are the same, and they correspond one-to-one. The head of each bolt 9 is completely contained within the corresponding retaining ring 7b to protect the bolt head from external impacts, ensuring the bolt 9's locking strength and improving structural stability. Preferably, the inner diameter of the retaining ring 7b is larger than the outer diameter of the bolt head, and there is an annular gap between the retaining ring 7b and the corresponding bolt head to reduce the force transmitted to the bolt 9 when the retaining ring 7b is impacted. Furthermore, the internally threaded pipe 2a presses against the front end face of the annular flange 7a. The annular flange 7a, the internally threaded pipe 2a, and the retaining ring 7b together form a cavity to completely accommodate the bolt 9, providing better protection for the bolt 9.

[0030] like Figure 3 As shown, an annular stepped groove 2b is formed on the front end face of the support base 2, and the stepped groove 2b and the support base 2 are coaxially arranged. The stepped groove 2b is composed of a stepped side wall and a stepped bottom wall; a guide ring 7c matching the stepped groove 2b is formed on the front end face of the positioning sleeve 7, and the guide ring 7c is inserted into the stepped groove 2b and presses against the stepped bottom wall, which is used for installation guidance of the support base 2 and facilitates assembly. Further, the stepped side wall is tapered with a diameter that gradually increases from front to back, and a conical surface 7d is correspondingly formed on the outer wall of the guide ring 7c, and the conical surface 7d is attached to the stepped side wall, which is used to forcibly correct the coaxiality of the positioning sleeve 7 and the support base 2 and improve the transmission accuracy of the input shaft 6 and the pump shaft 3. Preferably, the axial length of the stepped side wall is greater than the axial length of the conical surface 7d.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A horizontal water pump shaft support structure, the water pump including a pump body (1) and a cylindrical support seat (2) fixed to the rear side of the pump body (1), a pump shaft (3) is horizontally arranged inside the support seat (2), the front end of the pump shaft (3) extends into the pump body (1), and the pump shaft (3) is rotatably mounted on the pump body (1) through a first bearing (5), characterized in that, The support base (2) has an input shaft (6) horizontally positioned on its rear side, and a gear (6a) is formed at the rear end of the input shaft (6). The pump shaft (3) has an axial slot (3a) at its rear end, and the front end of the input shaft (6) is inserted into the slot (3a). The input shaft (6) and the pump shaft (3) are connected by a spline connection. A positioning sleeve (7) is provided between the support base (2) and the gear (6a). The positioning sleeve (7) is fitted over the input shaft (6), and the two are rotatably connected by a second bearing (8). An annular flange (7a) coaxial with the positioning sleeve (7) is formed on the outer wall of the positioning sleeve (7), and the annular flange (7a) is detachably fixed to the support base (2) by a ring of horizontally arranged bolts (9).

2. The horizontal water pump shaft support structure according to claim 1, characterized in that, The aforementioned annular flange (7a) has an axially penetrating through hole, the number of through holes is the same as the number of bolts (9), and the shank of each bolt (9) is inserted into the corresponding through hole; the annular flange (7a) extends backward from the position of the through hole to form a retaining ring (7b), the number of retaining rings (7b) is the same as the number of through holes and their positions correspond one-to-one, and the head of each bolt (9) is completely in the corresponding retaining ring (7b).

3. The horizontal water pump shaft support structure according to claim 2, characterized in that, The inner diameter of the retaining ring (7b) is larger than the outer diameter of the bolt head (9), and there is an annular gap between the retaining ring (7b) and the corresponding bolt head (9).

4. The horizontal water pump shaft support structure according to claim 1, characterized in that, The outer wall of the support (2) is horizontally formed with an internal threaded tube (2a), and the internal threaded tube (2a) is located between the support (2) and the annular flange (7a); the number of internal threaded tubes (2a) and bolts (9) are the same and in the same position, and the shank of the bolts (9) is screwed into the corresponding internal threaded tube (2a).

5. The horizontal water pump shaft support structure according to claim 4, characterized in that, The internally threaded pipe (2a) presses against the front end face of the annular flange (7a).

6. The horizontal water pump shaft support structure according to claim 1, characterized in that, The front end face of the support base (2) is provided with an annular stepped groove (2b), and the stepped groove (2b) is composed of a stepped side wall and a stepped bottom wall; the front end face of the positioning sleeve (7) is formed with a guide ring (7c) that matches the stepped groove (2b), and the guide ring (7c) is inserted into the stepped groove (2b).

7. The horizontal water pump shaft support structure according to claim 6, characterized in that, The sidewall of the step is a cone shape with a diameter that gradually increases from front to back. A cone surface (7d) is formed on the outer wall of the guide ring (7c), and the cone surface (7d) is attached to the sidewall of the step.

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