Sealing structure of self-priming pump

Abstract

The utility model provides a sealing structure of a self-priming pump, and belongs to the technical field of pumps. The technical problem that a sealing piece between an existing motor shaft and a pump shell is prone to being damaged is solved. A sealing structure of a self-priming pump comprises a motor shell and a pump shell, a rotating shaft is arranged in the motor shell, a pump cavity is formed in the pump shell, a mounting hole communicated with the pump cavity is formed in the pump shell, a first sealing piece is arranged in the mounting hole, a motor end cover is fixedly connected between the motor shell and the pump shell, and a mounting cavity is formed between the motor end cover and the pump shell. The rotating shaft penetrates through the mounting cavity and the first sealing piece to extend into the pump cavity, the rotating shaft is sleeved with a fastening assembly, and one end of the fastening assembly abuts against the first sealing piece and limits axial movement of the first sealing piece. According to the utility model, the sealing performance between the motor shaft and the pump shell is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pumps, in particular to a sealing structure of a self-priming pump. Background Art

[0002] Before starting the self-priming pump, the pump casing must be filled with water. After starting, the motor drives the impeller to rotate at high speed to generate high pressure, causing the water in the impeller groove to flow to the volute. At this time, a vacuum is formed at the inlet. Due to the effect of atmospheric pressure, the air and liquid in the pump and pipeline are sucked into the impeller through the water inlet and the trumpet-shaped nozzle, and then enter the water outlet of the pump body through the guide groove in the guide vane and are ejected out.

[0003] The motor shaft of a self-priming pump passes through the impeller cavity within the pump casing and is fixed to the impeller, or the motor shaft is connected to the pump shaft via a coupling, which drives the impeller. However, during rotation, the motor shaft may move axially, which can easily damage the seal between the motor shaft and the pump casing, causing leakage in the pump casing and shortening the service life of the entire unit. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a sealing structure for a self-priming pump. The technical problem to be solved by the present invention is how to improve the sealing effect between the motor shaft and the pump housing.

[0005] The purpose of the utility model can be achieved through the following technical solutions: A sealing structure of a self-priming pump, including a motor housing and a pump housing, a rotating shaft is provided in the motor housing, a pump chamber is provided in the pump housing, a mounting hole is provided on the pump housing connected to the pump chamber, a seal 1 is provided in the mounting hole, a motor end cover is fixedly connected between the motor housing and the pump housing, a mounting chamber is formed between the motor end cover and the pump housing, the rotating shaft passes through the mounting chamber and the seal 1 and extends into the pump chamber, a fastening assembly is sleeved on the rotating shaft, one end of the fastening assembly rests on the seal 1 and limits the axial movement of the seal 1. The self-priming pump is a motor-integrated pump, and the motor housing of the self-priming pump is provided with a rotating shaft in which the stator and rotor rotate together with the rotor. The pump housing has a water inlet chamber and a water outlet chamber, both of which are connected to the pump chamber, an impeller is provided in the pump chamber, and the rotating shaft is fixedly connected to the impeller and drives the impeller to rotate. Both ends of the motor housing are fixedly connected with motor end covers and motor left end covers of different shapes. The motor end cover fixedly connected between the motor housing and the pump housing has an installation cavity. The installation cavity is used to set a fastening component to limit the movement of the seal in the axial direction of the rotating shaft to prevent its axial jump. During the rotation of the rotating shaft, the seal can be better sealed and rotated with the rotating shaft to prevent water leakage in the pump housing and extend the service life of the entire machine.

[0006] Furthermore, the fastening assembly includes a first fixing block and a first fixing plate, wherein one end of the first fixing block abuts against the first sealing member, the first fixing plate is fixed to the pump housing via a fixing member, and the first fixing plate presses against the first fixing block. The first fixing block can be embedded in the mounting hole and abut against the first sealing member, and the first fixing plate is fixed to the end face of the mounting hole via a fixing member and then pressed onto one end face of the first fixing block, so that the fixing block can limit the axial movement of the first sealing member. Of course, the first fixing block may not be embedded in the mounting hole, but it is preferred that the first fixing block be embedded in the mounting hole. The first fixing block and the first fixing plate may be a single piece or a separate piece.

[0007] Furthermore, the fastening assembly also includes a second fixed block and a third fixed block. A spring is provided between the second and third fixed blocks. The third fixed block is fixed by a retaining spring and a rotating shaft. A bearing 1 is provided between the second and first fixed blocks. The third fixed block is fixed by a retaining spring and a rotating shaft. The retaining spring is engaged and fixed with the rotating shaft. The retaining spring and the third fixed block are fixed by bolts. The rotation of the rotating shaft through the provision of bearing 1 can drive the second fixed block, the third fixed block, and the spring to rotate together, thereby reducing the friction of the fastening assembly on the rotation of the rotating shaft. Under the action of the spring, the second fixed block can better prompt the first fixed block to press against the seal 1, limiting the axial movement of the seal 1, and improving the overall sealing effect.

[0008] Furthermore, the first fixing block, the second fixing block and the bearing are all sleeved on the outer circumference of the rotating shaft and are loosely matched with the rotating shaft.

[0009] Furthermore, a second seal is provided between the outer circumference of the first fixed block and the mounting hole, a first fixed groove is recessed inwardly at one end of the first fixed block close to the second fixed block, and one end of the first bearing is located in the first fixed groove.

[0010] Furthermore, a seal three is provided between the inner circumference of the second fixed block and the rotating shaft, and a second fixed groove is recessed inwardly at one end of the second fixed block close to the first fixed block, and the other end of the bearing one is located in the second fixed groove.

[0011] Furthermore, the motor end cover has a circular portion protruding from one end toward the pump housing, the circular portion rests against the pump housing, and the interior of the circular portion and the pump housing form a mounting cavity.

[0012] Furthermore, a bearing mounting portion is protruded from one end of the motor end cover toward the motor housing, and the bearing mounting portion is provided with a second bearing.

[0013] Compared with the prior art, the technical effects of the present invention are as follows: 1. By providing a fastening assembly to limit the axial runout of seal 1, seal 1 has better sealing performance. 2. The fastening assembly includes a first fixing block, a second fixing block, and a third fixing block, which are separately arranged. The second fixing block, under the action of the elastic force of the spring, causes the first fixing block to better press seal 1, reducing axial clearance, preventing axial runout, and achieving a better sealing effect. 3. The second and third fixing blocks can rotate with the rotating shaft, which can reduce friction on the rotating shaft and improve the output efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the utility model.

[0015] Figure 2 It is an enlarged view of point A of the present utility model.

[0016] Figure 3 It is a cross-sectional view of the fastening assembly of the utility model.

[0017] Figure number marking: 1. Motor housing; 2. Pump housing; 201. Pump chamber; 202. Mounting hole; 3. Rotating shaft; 4. Seal 1; 5. Motor end cover; 501. Mounting chamber; 502. Circular ring; 503. Bearing mounting portion; 6. Fastening assembly; 61. First fixing block; 611. First fixing groove; 62. First fixing plate; 63. Second fixing block; 631. Second fixing groove; 64. Third fixing block; 65. Spring; 66. Bearing 1; 67. Seal 2; 68. Seal 3; 7. Bearing 2; 8. Impeller. DETAILED DESCRIPTION

[0018] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0019] according to Figures 1 to 3The figure shows a sealing structure for a self-priming pump, comprising a motor housing 1 and a pump housing 2. A motor end cap 5 and a motor left end cap of different shapes are fixedly connected at each end of the motor housing 1. The motor end cap 5 is fixedly connected between the motor housing 1 and the pump housing 2. A bearing mounting portion 503 protrudes from one end of the motor end cap 5 toward the motor housing 1, and the bearing mounting portion 503 is provided with a bearing 7. The motor left end cap also has a bearing mounting portion, and the rotating shaft 3 can extend out of the motor left end cap and connect to the cooling fan. The motor end cap 5 and the motor left end cap together support the rotation of the motor rotating shaft 3. The motor end cap 5 has a mounting cavity 501. A circular portion 502 protrudes from one end of the motor end cap 5 toward the pump housing 2. The circular portion 502 abuts against the pump housing 2, and the interior of the circular portion 502 forms a mounting cavity 501 with the pump housing 2. The rotating shaft 3 is disposed within the motor housing 1. The pump housing 2 has a pump cavity 201 within it. The pump housing 2 has a stepped mounting hole 202 that connects to the pump chamber 201. A seal 4 is installed within the mounting hole 202. The pump housing 2 includes a water inlet and outlet chambers, both of which connect to the pump chamber 201. An impeller 8 is housed within the pump chamber 201, and the rotating shaft 3 is fixedly connected to the impeller 8, driving its rotation. The rotating shaft 3 extends through the mounting cavity 501 and the seal 4 into the pump chamber 201. A fastening assembly 6 is sleeved onto the rotating shaft 3, one end of which abuts against the seal 4 and restricts its axial movement.

[0020] The fastening assembly 6 includes a first fixing block 61 and a first fixing plate 62. One end of the first fixing block 61 rests against the seal 4. The first fixing plate 62 is fixed to the pump housing 2 via a fixing member, and the first fixing plate 62 presses against the first fixing block 61. The first fixing block 61 can be embedded in the mounting hole 202 and rest against the seal 4. The first fixing plate 62 is fixed to the end surface of the mounting hole 202 via a fixing member and then pressed onto one end surface of the first fixing block 61. The fixing block can limit the axial movement of the seal 4. Of course, the first fixing block 61 can also be not embedded in the mounting hole 202. Here, it is preferred that the first fixing block 61 is embedded in the mounting hole 202. The first fixing block 61 and the first fixing plate 62 can be a single piece or a separate piece.

[0021] The fastening assembly 6 also includes a second fixing block 63 and a third fixing block 64. A spring 65 is interposed between the second and third fixing blocks 63 and 64. The third fixing block 64 is secured to the rotating shaft 3 via a retaining spring. A bearing 1 66 is interposed between the second fixing block 63 and the first fixing block 61. The third fixing block 64 is secured to the rotating shaft 3 via a retaining spring, which engages and secures the rotating shaft 3. The retaining spring and the third fixing block 64 are secured via bolts. The bearing 1 66 allows the rotating shaft 3 to rotate, driving the second, third, and spring 65 together, thereby reducing friction caused by the fastening assembly 6 on the rotating shaft 3. The spring 65 acts to better compress the first fixing block 61 against the seal 1 4, limiting its axial movement and enhancing the overall sealing effect. The first and second fixing blocks 61, 63, and bearing 1 66 are all sleeved around the outer periphery of the rotating shaft 3 and are loosely coupled to the shaft 3. A second seal 67 is provided between the outer circumference of the first fixing block 61 and the mounting hole 202. A first fixing groove 611 is recessed inwardly at the end of the first fixing block 61 near the second fixing block 63, with one end of the first bearing 66 located within the first fixing groove 611. A third seal 68 is provided between the inner circumference of the second fixing block 63 and the rotating shaft 3. A second fixing groove 631 is recessed inwardly at the end of the second fixing block 63 near the first fixing block 61, with the other end of the first bearing 66 located within the second fixing groove 631.

[0022] Seal 1 (4) is embedded in mounting hole 202, with one end resting against the stepped surface of mounting hole 202 to prevent seal 1 (4) from falling out. Install the third fixing block 64, spring 65, and second fixing block 63 on the rotating shaft 3. Use a retaining spring to limit and secure the third fixing block 64. Install bearing 1 (66), first fixing plate 62, and first fixing block 61, and then pass seal 1 (4). The first fixing plate 62 is fixedly connected to the pump housing 2. The first fixing plate 62 limits the axial fall of the first fixing block 61. One end of bearing 1 (66) is embedded in the first fixing groove 611, and the second fixing block 63 is sleeved on the other end of bearing 1 (66) through the second fixing groove 631. The first fixing block 61 and the second fixing block 63 are supported by seal 2 (67) and seal 3 (68), respectively, to maintain a certain clearance fit with the rotating shaft 3. This allows the force of spring 65 to better compress seal 1 (4), making seal 1 (4) more sealing.

[0023] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection defined by the claims of the present invention.

Claims

1. A sealing structure for a self-priming pump, comprising a motor housing (1) and a pump housing (2), wherein a rotating shaft (3) is provided in the motor housing (1), a pump chamber (201) is provided in the pump housing (2), a mounting hole (202) communicating with the pump chamber (201) is provided on the pump housing (2), and a sealing member (4) is provided in the mounting hole (202), characterized in that: A motor end cover (5) is fixedly connected between the motor housing (1) and the pump housing (2), and a mounting cavity (501) is formed between the motor end cover (5) and the pump housing (2). The rotating shaft (3) passes through the mounting cavity (501) and the sealing member 1 (4) and extends into the pump cavity (201). A fastening assembly (6) is sleeved on the rotating shaft (3), and one end of the fastening assembly (6) abuts against the sealing member 1 (4) and limits the axial movement of the sealing member 1 (4).

2. The sealing structure of a self-priming pump according to claim 1, characterized in that: The fastening assembly (6) includes a first fixing block (61) and a first fixing plate (62), one end of the first fixing block (61) rests on the sealing member 1 (4), the first fixing plate (62) is fixed to the pump housing (2) through a fixing member, and the first fixing plate (62) presses the first fixing block (61).

3. The sealing structure of a self-priming pump according to claim 2, characterized in that: The fastening assembly (6) further includes a second fixing block (63) and a third fixing block (64), a spring (65) is provided between the second fixing block (63) and the third fixing block (64), the third fixing block (64) is fixed via a retaining spring and the rotating shaft (3), and a bearing 1 (66) is provided between the second fixing block (63) and the first fixing block (61).

4. The sealing structure of a self-priming pump according to claim 3, characterized in that: The first fixing block (61), the second fixing block (63) and the bearing 1 (66) are all sleeved on the outer periphery of the rotating shaft (3) and are clearance-matched with the rotating shaft (3).

5. The sealing structure of a self-priming pump according to claim 4, characterized in that: A second sealing member (67) is provided between the outer peripheral surface of the first fixing block (61) and the mounting hole (202); an end of the first fixing block (61) close to the second fixing block (63) is inwardly recessed with a first fixing groove (611); and one end of the first bearing (66) is located in the first fixing groove (611).

6. The sealing structure of a self-priming pump according to claim 4, characterized in that: A seal member 3 (68) is provided between the inner circumference of the second fixed block (63) and the rotating shaft (3); a second fixed groove (631) is recessed inwardly at one end of the second fixed block (63) close to the first fixed block (61); and the other end of the bearing 1 (66) is located in the second fixed groove (631).

7. The sealing structure of a self-priming pump according to claim 1, characterized in that: The motor end cover (5) has a circular portion (502) protruding from one end toward the pump housing (2). The circular portion (502) abuts against the pump housing (2), and the interior of the circular portion (502) and the pump housing (2) form a mounting cavity (501).

8. The sealing structure of a self-priming pump according to claim 1, characterized in that: The motor end cover (5) has a bearing mounting portion (503) protruding from one end thereof toward the motor housing (1), and the bearing mounting portion (503) is provided with a second bearing (7).

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