Mechanical seal self-lubricating mechanism of screw pump

Abstract

The utility model provides a mechanical seal self-lubricating mechanism of a screw pump, and belongs to the technical field of water pumps. The problem that an existing structure is inconvenient to adjust is solved. The screw pump comprises a connecting framework and a pump shaft, a cylindrical connecting portion is arranged in the middle of the upper end of the connecting framework, the pump shaft is vertically arranged in the connecting portion in a penetrating mode, a self-lubricating mechanism comprises an annular groove formed in the outer side wall of the middle of the connecting portion, and an oil guide hole enabling the annular groove to be communicated with an inner cavity of the connecting portion is formed in the side wall of the connecting portion. The connecting part is sleeved with a guide sleeve and a pressing ring, the pressing ring is located below the guide sleeve, the pressing ring is in threaded connection with the connecting part, and the guide sleeve is clamped and positioned between the outer wall of the connecting part and the pressing ring; the inner walls of the two ends of the guide sleeve and the outer side wall of the connecting part form sealing, an oil injection hole communicating with the annular groove penetrates through the middle of the guide sleeve in the radial direction, and a plugging piece used for cutting off communication between the oil injection hole and the outside is detachably fixed to the guide sleeve. The device is convenient to adjust.

Description

Technical Field

[0001] The utility model belongs to the technical field of water pumps and relates to a screw pump, in particular to a mechanical seal self-lubricating mechanism of a screw pump. Background Art

[0002] A screw pump, also known as a spiral pump, a screw water pump or an Archimedean screw pump, is a pump that uses the rotation of spiral blades to cause water to rise in an axial spiral.

[0003] 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.

[0004] In the above-mentioned mechanical seal, the oil filling hole on the shaft frame is connected with the oil inlet connecting hole on the stationary ring seat to form an oil filling hole that connects the oil storage cavity with the outside. In actual use, when the oil filling hole needs to be adjusted due to the working conditions, the mechanical seal needs to adjust the positions of the oil filling hole and the oil inlet connecting hole at the same time, which requires many operating steps and is cumbersome to operate. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a self-lubricating mechanism for a screw pump mechanical seal which is easy to adjust to adapt to different working conditions.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a screw pump mechanical seal self-lubricating mechanism, the screw pump includes a connecting skeleton and a pump shaft, the middle part of the upper end of the connecting skeleton is a vertically arranged and cylindrical connecting part, and the pump shaft is vertically penetrated in the connecting part, and the inner side walls at both ends of the connecting part are respectively provided with annular upper steps and lower steps, which are characterized in that the self-lubricating mechanism includes an annular groove provided on the outer side wall of the middle part of the connecting part, and the annular groove is coaxially arranged with the connecting part; an oil guide hole is provided inside the side wall of the connecting part to connect the annular groove to the inner cavity of the connecting part; a guide sleeve and a pressure ring are provided on the outer sleeve of the connecting part, the pressure ring is located below the guide sleeve, the pressure ring is threadedly connected to the connecting part, and the guide sleeve is clamped and positioned between the outer wall of the connecting part and the pressure ring; the inner walls at both ends of the guide sleeve form a seal with the outer wall of the connecting part, an oil filling hole connected to the annular groove is radially penetrated in the middle part of the guide sleeve, and a sealing member for cutting off the connection between the oil filling hole and the outside is detachably fixed on the guide sleeve.

[0007] During actual assembly, the upper step and the lower step are used to support the mechanical seal and the annular oil seal respectively; remove the sealing parts and feed lubricating oil into the oil filling hole. The lubricating oil flows upward through the annular gap formed between the connecting part and the pump shaft and contacts 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 service life of the mechanical seal.

[0008] A pressure ring is arranged to be threadedly connected to the connecting part, and a guide sleeve is clamped and positioned between the outer wall of the connecting part and the pressure ring. Thus, after the pressure sleeve is screwed down, the guide sleeve can be rotated to adjust the position of the oil filling hole to adapt to different working conditions. When the position of the oil filling hole is adjusted, the pressure ring can be screwed in to reposition the guide sleeve. The whole adjustment process has very few operating steps and has the advantages of being easy and convenient to use.

[0009] In the above-mentioned screw pump mechanical seal self-lubricating mechanism, a positioning step in an annular shape and coaxial with the connecting part is formed on the outer wall of the connecting part, the positioning step is composed of an annular side wall and an annular bottom wall, the pressure ring and the guide sleeve are both in the positioning step, the pressure ring is threadedly connected to the annular side wall, the two end surfaces of the guide sleeve are respectively pressed against the annular bottom wall and the pressure ring, and the above-mentioned annular groove is arranged on the annular side wall. The above-mentioned design has the advantages of simple structure and convenient installation.

[0010] In the above-mentioned screw pump mechanical seal self-lubricating mechanism, the above-mentioned guide sleeve inner side wall and the above-mentioned annular side wall are mutually matching circumferential surfaces and the two are attached together, so that a certain seal is formed between the guide sleeve and the connecting part, and it is used to guide the guide sleeve for rotation, which facilitates the adjustment of the oil filling hole position.

[0011] In the above-mentioned screw pump mechanical seal self-lubricating mechanism, an annular installation groove is opened on the annular side wall, and there are two installation grooves distributed along the axial direction of the pump shaft. O-rings are arranged in both installation grooves, and the outer circumferential surfaces of the two O-rings are respectively in contact and sealed with the inner side surfaces at both ends of the guide sleeve to further enhance the sealing performance formed between the guide sleeve and the connecting part, and improve the working stability of the self-lubricating mechanism.

[0012] In the above-mentioned screw pump mechanical seal self-lubricating mechanism, the axial cross-section of the annular groove is trapezoidal, and the groove width of the annular groove gradually decreases from the guide sleeve to the pump shaft, which plays a guiding and gathering role, allowing the lubricating oil to be introduced into the oil guide hole through the annular groove more quickly, thereby accelerating the oil injection efficiency.

[0013] In the above-mentioned screw pump mechanical seal self-lubricating mechanism, the oil guide hole is in the shape of a straight hole, and the two ends of the oil guide hole are respectively located on the inner side surface of the connecting part and the bottom surface of the annular groove to further speed up the oil injection efficiency.

[0014] In the above-mentioned screw pump mechanical seal self-lubricating mechanism, there are at least two oil guide holes which are evenly distributed along the circumference of the pump shaft.

[0015] In the above-mentioned screw pump mechanical seal self-lubricating mechanism, a connecting pipe is horizontally fixed on the guide sleeve, one end of the connecting pipe is fixedly connected to the guide sleeve and communicates with the above-mentioned oil injection hole, and the plugging piece is detachably fixedly connected to the connecting pipe, and the plugging piece is used to block the other end of the connecting pipe. The setting of the connecting pipe can shorten the distance between the connecting pipe and the operator's hand, making it more convenient to rotate the guide sleeve to adjust the position of the oil injection hole.

[0016] In the above-mentioned screw pump mechanical seal self-lubricating mechanism, the type of the sealing member is a rubber plug, the inner end of the rubber plug is inserted into the connecting pipe, and the inner end side wall of the rubber plug is in close contact with the inner wall of the connecting pipe to form a seal.

[0017] In the above-mentioned screw pump mechanical seal self-lubricating mechanism, the oil filling hole is a stepped hole, which consists of a large hole and a small hole, and the large hole is connected to the above-mentioned annular groove through the small hole; one end of the connecting pipe is inserted into the large hole and pressed on the bottom wall of the large hole, which is convenient for connecting the connecting pipe and the guide sleeve.

[0018] Compared with the prior art, the screw pump mechanical seal self-lubricating mechanism has the following advantages:

[0019] 1. Set the pressure ring and the connecting part to be threaded, and the guide sleeve is clamped and positioned between the outer wall of the connecting part and the pressure ring. After the pressure sleeve is screwed down, the guide sleeve can be rotated to adjust the position of the oil filling hole to adapt to different working conditions. When the position of the oil filling hole is adjusted, the pressure ring can be screwed in to reposition the guide sleeve. The whole adjustment process has very few operating steps, which is convenient and easy to use.

[0020] 2. The setting of the connecting pipe can shorten the distance between the connecting pipe and the operator's hand, making it more convenient to rotate the guide sleeve to adjust the position of the oil filling hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of the self-lubricating mechanism of the mechanical seal of the screw pump.

[0022] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0023] Figure 3 It is a three-dimensional schematic diagram of the connected skeleton.

[0024] In the figure, 1, connecting skeleton; 1a, connecting part; 1a1, annular groove; 1a2, oil guide hole; 1a3, annular side wall; 1b, upper flange ring; 1c, lower flange ring; 1d, connecting foot; 2, pump shaft; 3, mechanical seal; 4, annular oil seal; 5, guide sleeve; 5a, oil filling hole; 6, pressure ring; 7, sealing piece; 8, O-ring; 9, connecting pipe. DETAILED DESCRIPTION

[0025] 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. Embodiment 1

[0026] like Figure 1 and Figure 3 As shown, the screw pump includes a connection frame 1 and a pump shaft 2. The middle part of the upper end of the connection frame 1 is a vertically arranged and cylindrical connection part 1a. The connection part 1a and the pump shaft 2 are coaxially arranged. The inner diameter of the connection part 1a is larger than the outer diameter of the pump shaft 2, and the pump shaft 2 is vertically penetrated in the connection part 1a. In the actual product, the connection frame 1 is an integrated structure, including a coaxially arranged upper flange ring 1b, a lower flange ring 1c, and a circle of connection feet 1d arranged between the upper flange ring 1b and the lower flange ring 1c, wherein the two ends of the connection foot 1d are respectively connected to the upper flange and the lower flange; the connection part 1a is formed on the upper flange.

[0027] The inner side walls at both ends of the connecting portion 1a are respectively provided with an annular upper step and a lower step, and the upper step, the lower step and the connecting portion 1a are coaxially arranged. During actual assembly, the upper step and the lower step are used to support the mechanical seal 3 and the annular oil seal 4 respectively.

[0028] like Figure 1 and Figure 2As shown, the self-lubricating mechanism of the mechanical seal of the screw pump includes an annular groove 1a1 formed on the outer wall of the middle part of the connecting part 1a, and the annular groove 1a1 is coaxially arranged with the connecting part 1a. An oil guide hole 1a2 is arranged inside the side wall of the connecting part 1a to connect the annular groove 1a1 to the inner cavity of the connecting part 1a. The connecting part 1a is covered with a guide sleeve 5 and a pressure ring 6, and the pressure ring 6 is located below the guide sleeve 5. The pressure ring 6 is threadedly connected to the connecting part 1a; the guide sleeve 5 is clamped and positioned between the outer wall of the connecting part 1a and the pressure ring 6. Figure 1 As shown, the inner walls at both ends of the guide sleeve 5 form a seal with the outer wall of the connecting portion 1a, an oil filling hole 5a connected to the annular groove 1a1 is radially penetrated in the middle of the guide sleeve 5, and a sealing member 7 for cutting off the connection between the oil filling hole 5a and the outside is detachably fixed on the guide sleeve 5.

[0029] When in use, remove the sealing member 7 and feed lubricating oil into the oil filling hole 5a. The lubricating oil flows upward through the annular gap formed between the connecting portion 1a and the pump shaft 2 and contacts the mechanical seal 3, thereby preventing the mechanical seal 3 from being damaged by dry grinding during the trial operation of the pump or when there is a lack of water in the pump chamber, thereby effectively extending the service life of the mechanical seal 3.

[0030] A pressure ring 6 is provided to be threadedly connected to the connecting portion 1a, and the guide sleeve 5 is clamped and positioned between the outer wall of the connecting portion 1a and the pressure ring 6. Thus, after the pressure sleeve is screwed down, the guide sleeve 5 can be rotated to adjust the position of the oil filling hole 5a to adapt to different working conditions. When the position of the oil filling hole 5a is adjusted, the pressure ring 6 is screwed in to reposition the guide sleeve 5. The entire adjustment process has very few operating steps and has the advantages of being easy and convenient to use.

[0031] Further explanation, a positioning step in an annular shape and coaxial with the connecting part 1a is formed on the outer wall of the connecting part 1a, and the positioning step is composed of an annular side wall 1a3 and an annular bottom wall. The pressure ring 6 and the guide sleeve 5 are both located in the positioning step, the pressure ring 6 is threadedly connected to the annular side wall 1a3, and the two end surfaces of the guide sleeve 5 are respectively pressed against the annular bottom wall and the pressure ring 6, and the annular groove 1a1 is set on the annular side wall 1a3. The above design has the advantages of simple structure and convenient installation.

[0032] In this embodiment,

[0033] The inner side wall of the guide sleeve 5 and the annular side wall 1a3 are mutually matching circumferential surfaces and the two are attached together, so that a certain seal is formed between the guide sleeve 5 and the connecting part 1a, and it is used to guide the guide sleeve 5 to rotate, which is convenient for adjusting the position of the oil filling hole 5a. Further explanation, an annular mounting groove is provided on the annular side wall 1a3, and the mounting groove and the connecting part 1a are coaxially arranged. There are two mounting grooves and they are distributed along the axial direction of the pump shaft 2. O-rings 8 are arranged in both mounting grooves, and the outer circumferential surfaces of the two O-rings 8 are respectively in contact and sealed with the inner side surfaces at both ends of the guide sleeve 5, so as to further strengthen the sealing performance formed between the guide sleeve 5 and the connecting part 1a, and improve the working stability of the self-lubricating mechanism.

[0034] like Figure 1 and Figure 2 As shown, a connecting pipe 9 is horizontally fixed on the guide sleeve 5, one end of the connecting pipe 9 is fixedly connected to the guide sleeve 5 and communicates with the above-mentioned oil injection hole 5a, and the plugging member 7 is detachably fixedly connected to the connecting pipe 9, and the plugging member 7 is used to block the other end of the connecting pipe 9. The setting of the connecting pipe 9 can be pulled closer to the distance between the connecting pipe 9 and the operator's hand, making it more convenient to rotate the guide sleeve 5 to adjust the position of the oil injection hole 5a.

[0035] in,

[0036] The structure of the sealing member 7 is as follows: the plug type is a rubber plug, the inner end of the rubber plug is inserted into the connecting tube 9, and the inner end side wall of the rubber plug is in close contact with the inner wall of the connecting tube 9 to form a seal.

[0037] The connecting tube 9 is installed as follows: the oil filling hole 5a is a stepped hole, which consists of a large hole and a small hole, and the large hole is connected to the annular groove 1a1 through the small hole; one end of the connecting tube 9 is inserted into the large hole and pressed on the bottom wall of the large hole, so as to facilitate the connection between the connecting tube 9 and the guide sleeve 5.

[0038] In actual products, the axial cross-section of the annular groove 1a1 is trapezoidal, and the groove width of the annular groove 1a1 gradually decreases from the guide sleeve 5 to the pump shaft 2, which plays a guiding and gathering role, so that the lubricating oil is introduced into the oil guide hole 1a2 through the annular groove 1a1 more quickly, thereby accelerating the oil injection efficiency. The oil guide hole 1a2 is in the shape of a straight hole, and the two ends of the oil guide hole 1a2 are respectively located on the inner side surface of the connecting portion 1a and the bottom surface of the annular groove 1a1, so as to further accelerate the oil injection efficiency. Preferably, there are at least two oil guide holes 1a2 and they are evenly distributed along the circumference of the pump shaft 2. Embodiment 2

[0039] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that the blocking member 7 is a sealing screw, and the stem of the sealing screw is screwed into the connecting pipe 9 .

[0040] 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 screw pump mechanical seal self-lubricating mechanism, the screw pump comprising a connecting frame (1) and a pump shaft (2), the middle portion of the upper end of the connecting frame (1) being a vertically arranged cylindrical connecting portion (1a), the pump shaft (2) vertically passing through the connecting portion (1a), and an upper step and a lower step both being annular are respectively provided on the inner side walls at both ends of the connecting portion (1a), It is characterized in that The self-lubricating mechanism comprises an annular groove (1a1) formed on the outer wall of the middle part of the connecting part (1a), and the annular groove (1a1) is coaxially arranged with the connecting part (1a); an oil guide hole (1a2) is arranged inside the side wall of the connecting part (1a) so that the annular groove (1a1) is connected to the inner cavity of the connecting part (1a); a guide sleeve (5) and a pressure ring (6) are arranged on the outer sleeve of the connecting part (1a), the pressure ring (6) is located below the guide sleeve (5), the pressure ring (6) is threadedly connected to the connecting part (1a), and the guide sleeve (5) is clamped and positioned between the outer wall of the connecting part (1a) and the pressure ring (6); the inner walls at both ends of the guide sleeve (5) are sealed with the outer wall of the connecting part (1a), an oil injection hole (5a) connected to the annular groove (1a1) is radially penetrated in the middle part of the guide sleeve (5), and a sealing member (7) for cutting off the connection between the oil injection hole (5a) and the outside is detachably fixed on the guide sleeve (5).

2. The screw pump mechanical seal self-lubricating mechanism according to claim 1, It is characterized in that A positioning step in an annular shape and coaxial with the connecting portion (1a) is formed on the outer wall of the connecting portion (1a), the positioning step being composed of an annular side wall (1a3) and an annular bottom wall, the pressing ring (6) and the guide sleeve (5) are both located in the positioning step, the pressing ring (6) is threadedly connected to the annular side wall (1a3), the two end surfaces of the guide sleeve (5) are respectively pressed tightly against the annular bottom wall and the pressing ring (6), and the annular groove (1a1) is arranged on the annular side wall (1a3).

3. The screw pump mechanical seal self-lubricating mechanism according to claim 2, It is characterized in that The inner side wall of the guide sleeve (5) and the annular side wall (1a3) are circumferential surfaces that match each other and are attached together.

4. The screw pump mechanical seal self-lubricating mechanism according to claim 3, It is characterized in that An annular mounting groove is provided on the annular side wall (1a3), wherein there are two mounting grooves and the mounting grooves are distributed along the axial direction of the pump shaft (2), and O-rings (8) are provided in both mounting grooves, and the outer circumferential surfaces of the two O-rings (8) are in contact and sealed with the inner side surfaces of both ends of the guide sleeve (5).

5. The screw pump mechanical seal self-lubricating mechanism according to claim 1, It is characterized in that The axial cross section of the annular groove (1a1) is trapezoidal, and the groove width of the annular groove (1a1) gradually decreases from the guide sleeve (5) toward the pump shaft (2).

6. The screw pump mechanical seal self-lubricating mechanism according to claim 1 or 5, It is characterized in that The oil guide hole (1a2) is in the shape of a straight hole, and two ends of the oil guide hole (1a2) are respectively located on the inner side surface of the connecting portion (1a) and the bottom surface of the annular groove (1a1).

7. The screw pump mechanical seal self-lubricating mechanism according to claim 6, It is characterized in that There are at least two oil guide holes (1a2) which are evenly distributed along the circumference of the pump shaft (2).

8. The screw pump mechanical seal self-lubricating mechanism according to claim 1, It is characterized in that A connecting pipe (9) is horizontally fixed on the guide sleeve (5), one end of the connecting pipe (9) is fixedly connected to the guide sleeve (5) and communicates with the oil injection hole (5a), the blocking piece (7) is detachably fixedly connected to the connecting pipe (9), and the blocking piece (7) is used to block the other end of the connecting pipe (9).

9. The screw pump mechanical seal self-lubricating mechanism according to claim 8, It is characterized in that The type of the sealing member (7) is a rubber plug, the inner end of the rubber plug is inserted into the connecting pipe (9), and the side wall of the inner end of the rubber plug is in close contact with the inner wall of the connecting pipe (9) to form a seal.

10. The screw pump mechanical seal self-lubricating mechanism according to claim 8, It is characterized in that The oil injection hole (5a) is a stepped hole, and is composed of a large hole and a small hole, and the large hole is connected to the annular groove (1a1) through the small hole; one end of the connecting pipe (9) is inserted into the large hole and pressed against the bottom wall of the large hole.

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