Lubricating structure for mechanical seal of water pump

Abstract

The utility model provides a mechanical seal lubricating structure of a water pump, and belongs to the technical field of water pumps. The problem that an existing lubricating structure is inconvenient to assemble is solved. The water pump comprises a connecting framework with a center hole and a pump shaft vertically arranged in the center hole in a penetrating mode, the lubricating structure comprises an annular seat which is integrally formed on the inner wall of the center hole and used for supporting a mechanical seal upwards, a connecting ring is integrally formed on the bottom wall of the annular seat, and a positioning sleeve is further sleeved outside the pump shaft. The inner diameters of the positioning sleeve, the annular seat and the connecting ring are greater than the outer diameter of the pump shaft; the upper end of the positioning sleeve is screwed outside the connecting ring, an annular step for installing an oil seal is arranged on the inner side wall of the lower end of the positioning sleeve, an oil injection hole horizontally penetrates through the middle of the positioning sleeve, and a plugging piece for plugging the oil injection hole is detachably fixed on the positioning sleeve. The mechanical seal lubricating structure of the water pump is convenient to assemble.

Description

Technical Field

[0001] The utility model belongs to the technical field of water pumps and relates to a water pump mechanical seal, in particular to a water pump mechanical seal lubrication structure. Background Art

[0002] In the current screw pumps, the mechanical seal mainly relies on medium lubrication, and when the pump is in trial operation or there is a lack of water in the pump chamber, the mechanical seal relies on lubricating oil for lubrication, and the lubricating oil injection method is such as a self-lubricating mechanical seal disclosed in the Chinese Patent Library (Application No.: 201710013566.1), the mechanical seal includes a sleeve, a static ring, a static ring seat, a dynamic ring, a spring and a dynamic ring seat, the spring is a wave spring; the sleeve is fixed on the pump shaft, and the sleeve is sequentially covered with a dynamic ring seat, a spring, a movable gasket, a dynamic ring, a static ring, a static ring seat, a skeleton oil seal and an adjusting nut from the inside to the outside; the dynamic ring seat is fixedly connected to the sleeve by a screw A; the spring, the movable gasket and the dynamic ring are arranged in the dynamic ring seat, and the spring is pressed on On the movable gasket, the movable gasket is pressed on the inner side of the movable ring, and the outer side of the movable ring is pressed on the inner side of the static ring, and the static ring is located in the static ring seat; the static ring seat is provided with an oil groove, the top surface of the oil groove is in contact with the shaft sleeve, the inner side of the oil groove is closed by the raised block on the static ring seat, and the outer side of the oil groove is sealed by a skeleton oil seal; there are two skeleton oil seals, and the two skeleton oil seals are clamped in the static ring seat by a retaining ring, and an oil storage cavity is formed by the space surrounded by the inner side surface of the inner skeleton oil seal, the bottom surface and the right side surface of the oil groove and the outer side surface of the shaft sleeve; the static ring seat is fixedly connected to the shaft frame, and the shaft frame is provided with an oil filling hole above the oil inlet connecting hole, and the shaft frame is provided with an oil drain hole below the oil outlet connecting hole, and the oil filling hole and the oil drain hole are sealed by screw plugs.

[0003] In the above mechanical seal, the stationary ring seat is installed and positioned using multiple screws. The whole process has many operating steps and the assembly is inconvenient. Utility Model Content

[0004] The utility model aims to solve the above problems in the prior art and proposes a water pump mechanical seal lubrication structure that is easy to assemble.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a water pump mechanical seal lubrication structure, the water pump includes a connecting skeleton with a center hole and a pump shaft vertically penetrated in the center hole, characterized in that the lubrication structure includes an annular seat integrally formed on the inner wall of the center hole and used to support the mechanical seal upward, a connecting ring is integrally formed on the bottom wall of the annular seat, and the connecting ring is coaxially arranged with the annular seat; a positioning sleeve is also sleeved on the outside of the pump shaft, and the inner diameters of the positioning sleeve, the annular seat and the connecting ring are all larger than the outer diameter of the pump shaft; the upper end of the positioning sleeve is threaded on the outside of the connecting ring, and the inner side wall of the lower end of the positioning sleeve is provided with an annular step for installing an oil seal, an oil filling hole is horizontally penetrated through the middle of the positioning sleeve, and a sealing member for sealing the oil filling hole is detachably fixed on the positioning sleeve.

[0006] When in use, lubricating oil is fed into the oil filling hole. The lubricating oil flows upward through the gap between the positioning sleeve and the annular seat and the pump shaft to contact the mechanical seal, preventing the mechanical seal from being damaged by dry grinding during trial operation or when there is a lack of water in the pump chamber, thereby effectively extending the life of the mechanical seal.

[0007] The locating sleeve with the oil filling hole is directly screwed onto the outside of the connecting ring to complete the installation, and the connecting ring and the connecting frame are an integrated structure, which can effectively reduce the steps required for installing the locating sleeve and make the overall assembly of the water pump more efficient and convenient.

[0008] In the above-mentioned water pump mechanical seal lubrication structure, an annular groove is provided on the outer wall of the connecting ring, an O-ring is provided in the annular groove, and the outer peripheral surface of the O-ring contacts and seals with the inner surface of the positioning sleeve to enhance the sealing strength formed between the positioning sleeve and the connecting ring and prevent leakage of lubricating oil.

[0009] In the above-mentioned water pump mechanical seal lubrication structure, the top wall of the positioning sleeve is pressed on the bottom wall of the annular seat, so that the positioning sleeve can be screwed into place at one time, which is convenient for assembly.

[0010] In the above-mentioned water pump mechanical seal lubrication structure, the sealing member is a bolt, and the bolt is screwed into the oil filling hole, which is convenient for disassembly and assembly.

[0011] As another solution, in the above-mentioned water pump mechanical seal lubrication structure, the sealing member is a columnar rubber plug, which is inserted into the oil filling hole, and the outer side of the rubber plug is in close contact with the inner side of the oil filling hole to form a seal.

[0012] In the above-mentioned water pump mechanical seal lubrication structure, the connection frame is an integrated structure and is formed by casting.

[0013] In the above-mentioned water pump mechanical seal lubrication structure, an annular installation groove is opened on the side wall of the bolt rod, a sealing ring is arranged in the installation groove, and the outer peripheral surface of the sealing ring contacts and seals with the inner wall of the oil filling hole, thereby enhancing the strength of the sealing inlet of the sealing member.

[0014] Compared with the prior art, the water pump mechanical seal lubrication structure is provided with a connecting frame of an integral structure, and an annular seat is formed on the inner side of the connecting frame to support the mechanical seal. In this way, the mechanical seal lubrication function can be achieved by simply screwing a positioning sleeve with an oil filling hole onto the outside of the connecting ring integrally formed on the connecting frame, thereby effectively reducing the installation steps of the entire lubrication structure and making the overall assembly of the water pump more efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the lubrication structure of the water pump mechanical seal.

[0016] Figure 2It is a cross-sectional schematic diagram of the lubrication structure of the water pump mechanical seal.

[0017] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0018] In the figure, 1, connecting frame; 1a, center hole; 1b, annular seat; 1c, connecting ring; 2, pump shaft; 3, positioning sleeve; 3a, annular step; 3b, oil filling hole; 4, bolt; 5, oil seal; 6, O-ring; 7, mechanical seal; 8, sealing ring. DETAILED DESCRIPTION

[0019] 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.

[0020] Embodiment 1

[0021] like Figure 1 and Figure 2 As shown, the water pump comprises a connection frame 1 with a center hole 1a, a pump shaft 2 vertically inserted into the center hole 1a, and a mechanical seal 7 sleeved on the pump shaft 2, and the pump shaft 2 and the center hole 1a are coaxially arranged. In actual products, the connection frame is an integrated structure and is formed by casting.

[0022] The water pump mechanical seal lubrication structure includes an annular seat 1b integrally formed on the inner wall of the center hole 1a and used to support the mechanical seal 7 upward, and a connecting ring 1c is integrally formed on the bottom wall of the annular seat 1b. Figure 1 As shown, the pump shaft 2 is also covered with a positioning sleeve 3, and the positioning sleeve 3, the connecting ring 1c, the annular seat 1b and the center hole 1a are coaxially arranged, and the inner diameters of the positioning sleeve 3, the annular seat 1b and the connecting ring 1c are all larger than the outer diameter of the pump shaft 2, so that there are annular gaps between the inner side walls of the positioning sleeve 3, the connecting ring 1c and the annular seat 1b and the outer side walls of the pump shaft 2. Figure 2 and Figure 3 As shown, the upper end of the positioning sleeve 3 is screwed to the outside of the connecting ring 1c, and the inner side wall of the lower end of the positioning sleeve 3 has an annular step 3a for installing the oil seal 5, and the annular step 3a is coaxially arranged with the positioning sleeve 3. An oil injection hole 3b is horizontally penetrated in the middle of the positioning sleeve 3, and the oil injection hole 3b is in the shape of a straight hole. The length of the oil injection hole 3b extends radially along the positioning sleeve 3, and a plugging member for plugging the oil injection hole 3b is detachably fixed on the positioning sleeve 3.

[0023] When in use, lubricating oil is fed into the oil filling hole 3b, and the lubricating oil flows upward through the gap between the positioning sleeve 3 and the annular seat 1b and the pump shaft 2 to contact the mechanical seal 7, preventing the mechanical seal 7 from being damaged by dry grinding during the pump trial operation or when there is a lack of water in the pump chamber, thereby effectively extending the service life of the mechanical seal 7.

[0024] The positioning sleeve 3 with the oil filling hole 3b is directly screwed onto the outside of the connecting ring 1c to complete the installation, and the connecting ring 1c and the connecting frame are an integrated structure, which can effectively reduce the steps required for installing the positioning sleeve 3 and make the overall assembly of the water pump more efficient and convenient.

[0025] Further explanation: the top wall of the positioning sleeve 3 is pressed on the bottom wall of the annular seat 1b, so that the positioning sleeve 3 can be screwed into place at one time, which is convenient for assembly. An annular groove is provided on the outer wall of the connecting ring 1c, and an O-ring 6 is provided in the annular groove. The outer peripheral surface of the O-ring 6 contacts and seals with the inner side surface of the positioning sleeve 3 to strengthen the sealing strength formed between the positioning sleeve 3 and the connecting ring 1c to prevent lubricating oil leakage.

[0026] In this embodiment, the plugging member is a bolt 4, and the bolt 4 is screwed into the oil filling hole 3b for easy disassembly and assembly. Further, an annular mounting groove is provided on the side wall of the rod of the bolt 4, and a sealing ring 8 is provided in the mounting groove, and the outer peripheral surface of the sealing ring 8 contacts and seals with the inner wall of the oil filling hole 3b, thereby enhancing the strength of the plugging member sealing the inlet.

[0027] Embodiment 2

[0028] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that the sealing member is a columnar rubber plug which is inserted into the oil filling hole 3b, and the outer side surface of the rubber plug is in close contact with the inner side surface of the oil filling hole 3b to form a seal.

[0029] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A water pump mechanical seal lubrication structure, the water pump comprising a connection frame (1) having a center hole (1a) and a pump shaft (2) vertically inserted into the center hole (1a), characterized in that: The lubrication structure comprises an annular seat (1b) integrally formed on the inner wall of the center hole (1a) and used for supporting the mechanical seal (7) upwards; a connecting ring (1c) is integrally formed on the bottom wall of the annular seat (1b), and the connecting ring (1c) is coaxially arranged with the annular seat (1b); a positioning sleeve (3) is also sleeved on the outside of the pump shaft (2), and the inner diameters of the positioning sleeve (3), the annular seat (1b) and the connecting ring (1c) are all larger than the outer diameter of the pump shaft (2); the upper end of the positioning sleeve (3) is screwed onto the outside of the connecting ring (1c), the inner side wall of the lower end of the positioning sleeve (3) is provided with an annular step (3a) for installing an oil seal (5), an oil injection hole (3b) is horizontally penetrated in the middle of the positioning sleeve (3), and a plugging piece for plugging the oil injection hole (3b) is detachably fixed on the positioning sleeve (3); the connecting frame (1) is an integral structure and is formed by casting.

2. The water pump mechanical seal lubrication structure according to claim 1, characterized in that: An annular groove is provided on the outer wall of the connecting ring (1c), an O-ring (6) is provided in the annular groove, and the outer peripheral surface of the O-ring (6) contacts and seals with the inner side surface of the positioning sleeve (3).

3. The water pump mechanical seal lubrication structure according to claim 1 or 2, characterized in that: The top wall of the positioning sleeve (3) is pressed against the bottom wall of the annular seat (1b).

4. The water pump mechanical seal lubrication structure according to claim 1 or 2, characterized in that: The blocking member is a bolt (4), and the bolt (4) is screwed into the oil filling hole (3b).

5. The water pump mechanical seal lubrication structure according to claim 1, characterized in that: The sealing member is a columnar rubber plug, which is inserted into the oil filling hole (3b), and the outer side surface of the rubber plug is in close contact with the inner side surface of the oil filling hole (3b) to form a seal.

6. The water pump mechanical seal lubrication structure according to claim 4, characterized in that: An annular mounting groove is provided on the side wall of the rod portion of the bolt (4), a sealing ring (8) is provided in the mounting groove, and the outer peripheral surface of the sealing ring (8) contacts and seals with the inner wall of the oil filling hole (3b).

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