Shaft seal capable of adjusting pressure

Abstract

The utility model relates to the technical field of shaft seals, and discloses a pressure-adjustable shaft seal which comprises a mounting ring, a movable ring arranged below the mounting ring, a static ring arranged below the movable ring, a compression spring arranged between the mounting ring and the movable ring, and an adjusting assembly arranged on the outer wall of the mounting ring. And the adjusting assembly comprises a connecting screw cylinder in threaded connection to the outer wall of the mounting ring, a clamping ring is fixed to the bottom face of the connecting screw cylinder, and the top end and the bottom end of a pressing spring are connected to the outer walls of the clamping ring and the movable ring in a sleeving mode correspondingly. The pressing spring can be pressed downwards or loosened upwards by rotating the connecting screw cylinder, so that the pressing force of the pressing spring on the movable ring is adjusted, the device can adapt to different working condition requirements, or when the pressing spring is aged and the elastic force is insufficient, the elastic force of the pressing spring is compensated through the adjusting mode, and the service life of the device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shaft seal technical field especially relates to a kind of adjustable pressure shaft seals. BACKGROUND

[0002] Shaft seal is generally used to prevent fluid conveying equipment shaft and bearing between liquid leakage, using the lip of shaft seal and the interference fit of equipment shaft and then play sealing effect.Mechanical seal of prior art generally includes static ring, static ring seat, moving ring, thrust spring, spring seat, auxiliary sleeve and gland.

[0003] Existing assembly type shaft seal (announcement number:CN201615221U) at least has following disadvantage: the device in use, spring cannot be adjusted to the pressure of moving ring according to reagent's working condition demand, leading to in the working condition of low pressure, spring still maintains strong pressure, thereby reducing the service life of friction ring and spring to some extent, and after the long-term use of shaft seal, spring can be weakened due to aging, at this time, only shaft seal can be replaced, for this, the utility model is proposed. UTILITARY MODEL CONTENT

[0004] The utility model aims at solving the shortcomings in the prior art, and provides a kind of adjustable pressure shaft seal.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A kind of adjustable pressure shaft seal, including installation ring, the lower portion of installation ring is provided with moving ring, the lower portion of moving ring is provided with static ring, and pressure spring is arranged between installation ring and moving ring, the outer wall of installation ring is provided with adjusting assembly, adjusting assembly includes the connecting screw cylinder of screw connection in the outer wall of installation ring, the bottom surface of connecting screw cylinder is fixed with clamping ring, and the top end and bottom end of pressure spring are respectively sleeved in the outer wall of clamping ring and moving ring.

[0007] As a further scheme of the utility model, the top surface of the moving ring is provided with a plurality of limiting openings, the plurality of limiting openings are arranged in a circular array with the axis of the moving ring as the center, the bottom surface of the installation ring is fixed with a limiting seat, and the limiting seat and the inside of the limiting opening are slidably arranged.

[0008] As a further scheme of the utility model, the top surface of the static ring is fixed with a static friction ring, the bottom surface of the moving ring is fixed with a dynamic friction ring, the static friction ring and the dynamic friction ring are in close contact, a fixing groove is formed in the inner wall of the moving ring close to the bottom surface, a first O-ring is fixed in the inside of the fixing groove, and a second O-ring is fixed on the outer wall of the static ring.

[0009] As a further scheme of the utility model, the bottom surface of the installation ring is provided with a plurality of pin holes, and the plurality of pin holes are arranged in a circular array with the axis of the installation ring as the center.

[0010] As a further scheme of the utility model, the outer wall of the mounting ring is slidably inserted with a mounting bolt, and the threaded end of the mounting bolt extends to the inside of the mounting ring.

[0011] As a further scheme of the utility model, the top surface of the connecting screw cylinder is fixed with a driving nut.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] By arranging the connecting screw cylinder on the outer wall of the mounting ring and fixing the clamping ring on the bottom surface of the connecting screw cylinder, the top end and the bottom end of the compression spring are respectively sleeved on the outer wall of the clamping ring and the moving ring, so that when the mounting ring is fixed on the shaft, the compression spring can be pressed downward or relaxed upward by rotating the connecting screw cylinder, thereby adjusting the compression force of the compression spring on the moving ring, and further making the device adapt to different working conditions, or compensating the elastic force of the compression spring and increasing the service life of the device when the compression spring is aged and the elastic force is insufficient. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A three-dimensional structure schematic view of the shaft seal with adjustable pressure is provided for the utility model;

[0015] Figure 2 A three-dimensional split structure schematic view of the shaft seal with adjustable pressure is provided for the utility model;

[0016] Figure 3 A three-dimensional structure schematic view of the mounting ring and the connecting screw cylinder of the shaft seal with adjustable pressure is provided for the utility model;

[0017] Figure 4 A three-dimensional structure schematic view of the moving ring and the static ring of the shaft seal with adjustable pressure is provided for the utility model.

[0018] In the figure: 1, mounting ring; 101, moving ring; 102, static ring; 103, compression spring; 2, connecting screw cylinder; 201, clamping ring; 202, limiting port; 203, limiting seat; 3, static friction ring; 301, dynamic friction ring; 302, fixed groove; 303, first O-shaped ring; 304, second O-shaped ring; 4, pin hole; 5, mounting bolt; 6, driving nut. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the utility model is further described below in combination with specific implementation manners.

[0020] In the description of the utility model, it is necessary to explain, the term "upper", "lower", "internal", "external" "front end", "rear end", "both ends", "one end", "the other end" and so on indicate the position relation or position relation is based on the position relation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation structure and operation, therefore cannot be understood as the restriction of the utility model. In addition, the term "first", "second" is only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the utility model, it is necessary to explain, unless otherwise explicitly provided and limited, the term "installation", "set with", "connection" and so on, should be broad understanding, for example "connection", can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0022] As Figures 1-4 The utility model discloses a pressure-adjustable shaft seal, including the installation ring 1, the lower portion of installation ring 1 is provided with dynamic ring 101, the lower portion of dynamic ring 101 is provided with static ring 102, and the pressure spring 103 is arranged between installation ring 1 and dynamic ring 101, the outer wall of installation ring 1 is provided with adjusting assembly, and adjusting assembly includes the connecting screw cylinder 2 of screwing in the outer wall of installation ring 1, the bottom surface of connecting screw cylinder 2 is fixed with the clamping ring 201, and the top end and bottom end of pressure spring 103 are respectively sleeved in the outer wall of clamping ring 201 and dynamic ring 101.

[0023] As Figures 2-4As shown, in this embodiment, the top surface of the moving ring 101 is provided with a plurality of limiting ports 202, which are arranged in a circular array with the axis of the moving ring 101 as the center. The bottom surface of the mounting ring 1 is fixed with a limiting seat 203, which is slidably disposed with respect to the interior of the limiting ports 202. By pressing the stationary ring 102 into the end cover of the shaft, the mounting ring 1, the moving ring 101, and the connecting screw 2 are together sleeved on the outer wall of the shaft. Then, the mounting ring 1 is pressed down, and the compression spring 103 is compressed. At this time, the limiting seat 203 is slidably disposed with respect to the interior of the limiting ports 202, so that the mounting ring 1 rotates. When rotating, the rotating ring 101 can be directly driven to rotate, preventing the clamping spring 103 from being subjected to torque when the shaft rotates. Then, the mounting ring 1 is moved to the mounting position of the shaft and installed on the outer wall of the shaft. At this time, the connecting screw 2 is driven to rotate. Under the action of the threaded connection between the connecting screw 2 and the outer wall of the mounting ring 1, the connecting screw 2 drives the snap ring 201 to move up and down, thereby adjusting the clamping force of the clamping spring 103 on the rotating ring 101. This allows the device to adapt to different working conditions, or when the clamping spring 103 is old and its elasticity is insufficient, this adjustment method can compensate for the elasticity of the clamping spring 103 and increase the service life of the device.

[0024] like Figures 2-4 As shown, in this embodiment, a static friction ring 3 is fixed to the top surface of the stationary ring 102, and a dynamic friction ring 301 is fixed to the bottom surface of the rotating ring 101. The static friction ring 3 and the dynamic friction ring 301 are in close contact. A fixing groove 302 is provided on the inner wall of the rotating ring 101 near the bottom surface. A first O-ring 303 is fixed inside the fixing groove 302, and a second O-ring 304 is fixed to the outer wall of the stationary ring 102. The first O-ring 303 can ensure that the rotating ring 101 and the outer wall of the shaft maintain a seal, and the second O-ring 304 ensures that the stationary ring 102 and the end cover are sealed. When the shaft seal is working, the rotating ring 101 rotates rapidly with the shaft, so that the dynamic friction ring 301 and the static friction ring 3 achieve frictional sealing, thereby enabling the shaft seal to achieve the rotational sealing function of the shaft.

[0025] like Figures 2-4 As shown, in this embodiment, the bottom surface of the mounting ring 1 is provided with a plurality of pin holes 4. The plurality of pin holes 4 are arranged in a circular array with the axis of the mounting ring 1 as the center. By setting the pin holes 4, when the stationary ring 102 is pressed into the end cover of the shaft, the pin holes 4 are engaged and limited with the pin seat in the end cover, preventing the stationary ring 102 from rotating with the shaft.

[0026] like Figures 2-4 As shown, in this embodiment, the outer wall of the mounting ring 1 is slidably fitted with a mounting bolt 5, and the threaded end of the mounting bolt 5 extends into the interior of the mounting ring 1. By setting the mounting bolt 5, it is convenient to install the mounting ring 1 and the outer wall of the shaft together.

[0027] like Figures 2-4As shown, in the embodiment, the top surface of the connecting screw cylinder 2 is fixed with a driving nut 6, by setting the driving nut 6, it is convenient for the staff to rotate the connecting screw cylinder 2 by using tools.

[0028] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: in use, by pressing the static ring 102 into the end cover of the shaft, and making the pin hole 4 and the pin seat in the end cover limit the connection, at this time, the mounting ring 1, the dynamic ring 101 and the connecting screw cylinder 2 are sleeved on the outer wall of the shaft, then press down the mounting ring 1, and make the compression spring 103 be compressed, at this time, the limit seat 203 and the inside of the limit port 202 are slidably arranged, so that the mounting ring 1 can directly drive the dynamic ring 101 to rotate when rotating, prevent the compression spring 103 from being twisted by the shaft, then the mounting ring 1 is moved to the installation place of the shaft, then the mounting bolt 5 is used to install the mounting ring 1 and the outer wall of the shaft, at this time, the tool is used to connect the driving nut 6 and drive the connecting screw cylinder 2 to rotate, under the threaded connection between the connecting screw cylinder 2 and the outer wall of the mounting ring 1, the connecting screw cylinder 2 drives the clamping ring 201 to move up and down, so as to adjust the compression force of the compression spring 103 on the dynamic ring 101, and then the device can adapt to different working conditions, or when the compression spring 103 is aging and the elastic force is insufficient, the elastic force of the compression spring 103 is compensated by this adjusting mode, and the service life of the device is increased.

[0029] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A pressure-adjustable shaft seal comprising a mounting ring (1), characterized in that The lower portion of the mounting ring (1) is provided with a moving ring (101), the lower portion of the moving ring (101) is provided with a static ring (102), the mounting ring (1) and the moving ring (101) are provided with a compression spring (103), the outer wall of the mounting ring (1) is provided with an adjusting assembly, the adjusting assembly comprises a connecting screw cylinder (2) which is screwed on the outer wall of the mounting ring (1), the bottom surface of the connecting screw cylinder (2) is fixedly connected with a clamping ring (201), and the top end and the bottom end of the compression spring (103) are sleeved with the outer wall of the clamping ring (201) and the moving ring (101) respectively.

2. A pressure-adjustable shaft seal according to claim 1, characterized in that The top surface of the moving ring (101) is provided with a plurality of limiting openings (202), the plurality of limiting openings (202) are arranged in a circular array with the axis of the moving ring (101) as the center, the bottom surface of the mounting ring (1) is fixedly connected with a limiting seat (203), and the limiting seat (203) and the inside of the limiting opening (202) are slidably arranged.

3. A pressure-adjustable shaft seal according to claim 2, wherein, The top surface of the static ring (102) is fixedly connected with a static friction ring (3), the bottom surface of the moving ring (101) is fixedly connected with a moving friction ring (301), the static friction ring (3) and the moving friction ring (301) are in close contact, the inner wall of the moving ring (101) is provided with a fixed groove (302) near the bottom surface, the inside of the fixed groove (302) is fixedly connected with a first O-shaped ring (303), and the outer wall of the static ring (102) is fixedly connected with a second O-shaped ring (304).

4. A pressure-adjustable shaft seal according to claim 3, wherein, The bottom surface of the mounting ring (1) is provided with a plurality of pin holes (4), and the plurality of pin holes (4) are arranged in a circular array with the axis of the mounting ring (1) as the center.

5. A pressure-adjustable shaft seal according to claim 4, wherein, The outer wall of the mounting ring (1) is slidably inserted with a mounting bolt (5), and the threaded end of the mounting bolt (5) extends into the inside of the mounting ring (1).

6. A pressure-adjustable shaft seal according to claim 5, wherein, The top surface of the connecting screw cylinder (2) is fixedly connected with a driving nut (6).

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