Mechanical seal for rotor pump

Abstract

The mechanical seal for the rotor pump comprises a shaft sleeve, the shaft sleeve is sleeved with an inner end cover and an outer end cover, the inner end cover and the outer end cover are located at the front end and the rear end of the shaft sleeve respectively, and the inner end cover and the outer end cover are fixedly connected through screws. Meanwhile, a medium end static ring is fixedly mounted in the inner end cover, and an atmosphere end static ring is fixedly mounted in the outer end cover; a medium end moving ring and an atmosphere end moving ring are fixedly installed at the front position and the rear position of the shaft sleeve. An internal thread is arranged at the front end of the inner wall of the shaft sleeve, an external thread is arranged at the corresponding position of the rotating shaft, the internal thread is meshed with the external thread, at least six positioning grooves are formed in the end part of the front end of the shaft sleeve, and a positioning threaded hole is formed in the side wall of the rotating shaft; the shaft sleeve can be adjusted relative to the rotating shaft, the adjusting precision is one sixth of the thread pitch of the threads, and the adjusting precision is high and can be adjusted according to specific conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal field, concretely is a kind of mechanical seal for rotor pump. BACKGROUND

[0002] Rotor pump is a form of positive displacement pump. It is composed of rotating rotor and stationary pump body. It has no suction and discharge valves. The working volume is changed by the relative movement between rotor and pump body. The liquid is discharged by the extrusion of rotating rotor. At the same time, space is left on the other side to form low pressure, so that the liquid is continuously sucked in. The important sealing part in mechanical seal type rotor pump.

[0003] For example, the patent with the authorization announcement number CN221033097U discloses a rotor pump mechanical seal device, which is installed between the pump shaft and the inner wall of the pump cavity, and includes a shaft sleeve, a bushing, a gland, a static ring and a dynamic ring. The shaft sleeve is fixed on the pump shaft. The bushing is fixed on the front side of the shaft sleeve and is integrally connected with the shaft sleeve. The gland is located between the shaft sleeve and the inner wall of the pump cavity, and a rear cavity is provided between the gland and the tail of the shaft sleeve. The static ring and the dynamic ring are oppositely arranged in the rear cavity. The static ring is fixed relative to the gland. The dynamic ring is connected and fixed with the shaft sleeve through a connecting assembly. A sliding sealing friction pair is formed between the dynamic ring and the static ring.

[0004] The rotor pump mechanical seal device of the above-mentioned patent effectively prevents impurity particles from entering the bearing box after the end face seal is damaged, causing bearing damage. The overall sealing performance is safe and reliable, and has high practicability. However, the above-mentioned patent has the following disadvantages: in order to maintain the appropriate pressure between the dynamic ring and the static ring, i.e. to prevent the dynamic ring and the static ring from being unable to rotate due to excessive pressure between them, and to prevent material from passing between the dynamic ring and the static ring due to the existence of gap between them caused by insufficient pressure; therefore, the distance between the static ring seat (the component for installing the static ring) and the shaft sleeve (the component for installing the dynamic ring) is limited. The positions of the static ring seat and the shaft sleeve of the above-mentioned patent are fixed and cannot be adjusted. During use, the spring will gradually lose its effectiveness, which will cause the pressure between the dynamic ring and the static ring to gradually decrease, resulting in a decrease in the sealing effect.

[0005] Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a mechanical seal for rotor pump to solve the problems raised in the above background.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0008] The utility model provides a kind of mechanical seal for rotor pump, including shaft sleeve, the inner end cap and outer end cap are sleeved on the shaft sleeve, inner end cap and outer end cap are located the front and rear ends of shaft sleeve respectively, and inner end cap and outer end cap are fixedly connected by screw;While inner end cap is fixedly installed with medium end static ring, outer end cap is fixedly installed with atmosphere end static ring;The front and rear positions on the shaft sleeve are fixedly installed with medium end dynamic ring and atmosphere end dynamic ring;The front end of the inner wall of the shaft sleeve is provided with internal thread, and the corresponding position of the rotating shaft is provided with external thread, and the internal thread and the external thread are engaged with each other, and the front end of the shaft sleeve is provided with at least six positioning grooves, and the sidewall of the rotating shaft is provided with positioning threaded hole, and positioning screw is fixedly installed in the positioning threaded hole, and the positioning screw is located in one of the positioning grooves.

[0009] Further, the first end of the shaft sleeve is integrally formed with a medium end dynamic ring seat, the rear side of the medium end dynamic ring seat is fixedly installed with a medium end dynamic ring, and the medium end dynamic ring is fixedly connected with the medium end dynamic ring seat by a medium end dynamic ring pin to prevent the medium end dynamic ring from rotating relative to the medium end dynamic ring seat.

[0010] Further, the tail end of the shaft sleeve is fixedly installed with an atmosphere end dynamic ring seat, and the outer circle of the atmosphere end dynamic ring seat is fixedly installed with an atmosphere end dynamic ring by an atmosphere end dynamic ring pin.

[0011] Further, the shaft sleeve is provided with a shaft shoulder at a position close to the front end of the atmosphere end dynamic ring seat for abutting against the front end of the atmosphere end dynamic ring seat, and a tightening screw is further provided between the atmosphere end dynamic ring seat and the shaft sleeve for fixing the atmosphere end dynamic ring seat and the shaft sleeve.

[0012] Further, the front end of the inner end cap is fixedly installed with a medium end static ring by a medium end static ring pin, and a medium end spring is further provided between the inner end cap and the medium end static ring.

[0013] Further, the top lower end of the outer end cap is fixedly installed with an atmosphere end static ring by an atmosphere end static ring pin, and an atmosphere end spring is further provided between the end of the atmosphere end static ring and the outer end cap.

[0014] Further, two water inlet and outlet holes are formed in the outer end cap.

[0015] Further, a plurality of vertically arranged turbulence grooves are formed in the outer wall of the shaft sleeve between the atmosphere end dynamic ring seat and the medium end dynamic ring seat, and the turbulence grooves are used to backflow the water from the water inlet and outlet holes to the medium end static ring and dynamic ring.

[0016] Further, an O-ring is provided between the inner end cap and the outer end cap.

[0017] The type ring is arranged between the medium end dynamic ring and the medium end dynamic ring seat for sealing the gap between the medium end dynamic ring and the medium end dynamic ring seat.

[0018] The type ring is arranged between the atmosphere end dynamic ring seat and the atmosphere end dynamic ring for sealing the gap between the atmosphere end dynamic ring seat and the atmosphere end dynamic ring.

[0019] The type ring is arranged between the atmosphere end dynamic ring seat and the shaft sleeve.

[0020] The O-shaped ring is arranged between the outer end cover and the atmosphere end static ring.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] The shaft sleeve can be adjusted compared with the rotating shaft, the adjusting precision is the pitch of the thread of one sixth, the adjusting precision is high, and the adjusting can be carried out according to specific conditions.

[0023] The turbulence groove is arranged for backflowing the water from the water inlet and outlet hole to the medium end static ring and dynamic ring. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic view of a mechanical seal for a rotor pump.

[0025] Figure 2 It is a front view of a mechanical seal for a rotor pump.

[0026] Figure 3 It is a plan view of a mechanical seal for a rotor pump.

[0027] Figure 4 It is a side view of a mechanical seal for a rotor pump.

[0028] Figure 5 It is Figure 2 The sectional view in A-A direction.

[0029] Figure 6 It is Figure 3 The sectional view in B-B direction.

[0030] Figure 7 It is Figure 2 The sectional view in C-C direction.

[0031] Figure 8 It is a structural schematic view of a shaft sleeve in a mechanical seal for a rotor pump.

[0032] Figure 9 It is a schematic view when the mechanical seal for a rotor pump is matched with a rotating shaft. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0034] Please refer to Figures 1-9 A mechanical seal for a rotor pump, comprising a shaft sleeve 100, in use, the shaft sleeve 100 is fixedly installed on a rotating shaft 900, and an O-ring is arranged between the inner wall of the shaft sleeve 100 and the rotating shaft 900 for sealing between the two;

[0035] The shaft sleeve 100 is sleeved with an inner end cover 200 and an outer end cover 300, the inner end cover 200 and the outer end cover 300 are located at the front and rear ends of the shaft sleeve 100 respectively, and the inner end cover 200 and the outer end cover 300 are fixedly connected through screws and an O-ring is arranged between the inner end cover 200 and the outer end cover 300 for sealing between the two;

[0036] Meanwhile, a medium end static ring 201 is fixedly installed in the inner end cover 200, and an atmosphere end static ring 301 is fixedly installed in the outer end cover 300; a medium end dynamic ring 110 and an atmosphere end dynamic ring 120 are fixedly installed on the front and rear positions of the shaft sleeve 100;

[0037] The medium end static ring 201 and the medium end dynamic ring 110 constitute a set of sealing element friction pairs, the atmosphere end static ring 301 and the atmosphere end dynamic ring 120 constitute a set of sealing element friction pairs, and there are two sets of sealing element friction pairs in total;

[0038] Specifically, a medium end dynamic ring seat 111 is integrally formed at the first end of the outer circle of the shaft sleeve 100, wherein a medium end dynamic ring 110 is fixedly installed at the rear side of the medium end dynamic ring seat 111, and the medium end dynamic ring 110 is fixedly connected with the medium end dynamic ring seat 111 through a medium end dynamic ring pin 112 to prevent the medium end dynamic ring 110 from rotating relative to the medium end dynamic ring seat 111;

[0039] An O-ring is further arranged between the medium end dynamic ring 110 and the medium end dynamic ring seat 111 for sealing the gap between the medium end dynamic ring 110 and the medium end dynamic ring seat 111;

[0040] The tail end of the shaft sleeve 100 is fixedly installed in a lower position, and an atmospheric end dynamic ring seat 121 is fixedly installed outside the atmospheric end dynamic ring seat 121 through an atmospheric end dynamic ring pin 122, and an atmospheric end dynamic ring 120 is fixedly installed outside the atmospheric end dynamic ring seat 121 through the atmospheric end dynamic ring pin 122;

[0041] The atmospheric end dynamic ring seat 121 and the atmospheric end dynamic ring 120 are also provided with an O-shaped ring for sealing the gap between the atmospheric end dynamic ring seat 121 and the atmospheric end dynamic ring 120.

[0042] Specifically, the shaft sleeve 100 is provided with a shaft shoulder at a position close to the front end of the atmospheric end dynamic ring seat 121 for abutting against the front end of the atmospheric end dynamic ring seat 121, and a tightening screw 123 is further arranged between the atmospheric end dynamic ring seat 121 and the shaft sleeve 100 for fixing the atmospheric end dynamic ring seat 121 and the shaft sleeve 100, and a tapered groove 124 is formed in the shaft sleeve 100 and matched with the tightening screw 123, and the tip of the tightening screw 123 is located in the tapered groove 124.

[0043] In order to further fix the atmospheric end dynamic ring seat 121, a positioning key 125 is further arranged between the atmospheric end dynamic ring seat 121 and the shaft sleeve 100.

[0044] Correspondingly, the atmospheric end dynamic ring seat 121 and the shaft sleeve 100 are both provided with a key groove 126 matched with the positioning key 125.

[0045] Similarly, the atmospheric end dynamic ring seat 121 and the shaft sleeve 100 are provided with an O-shaped ring.

[0046] The front end of the inner end cover 200 is fixedly installed with a medium end static ring 201 through a medium end static ring pin 202 for preventing the medium end static ring 201 from rotating relative to the inner end cover 200, and a medium end spring 203 is further arranged between the inner end cover 200 and the medium end static ring 201 for providing a forward thrust to the medium end static ring 201, thereby providing pressure to the sealing friction pair composed of the medium end static ring 201 and the medium end dynamic ring 110, and an O-shaped ring is arranged between the inner wall of the inner end cover 200 and the outer wall of the medium end static ring 201.

[0047] The top lower end of the outer end cover 300 is fixedly installed with an atmospheric end static ring 301 through an atmospheric end static ring pin 302 for preventing the atmospheric end static ring 301 from rotating relative to the outer end cover 300, and an atmospheric end spring 303 is further arranged between the atmospheric end static ring 301 and the outer end cover 300 for providing a forward thrust to the atmospheric end static ring 301, thereby providing pressure to the sealing friction pair composed of the atmospheric end static ring 301 and the atmospheric end dynamic ring 120, and an O-shaped ring is arranged between the outer end cover 300 and the atmospheric end static ring 301.

[0048] In the scheme, two water inlet and outlet holes 304 are formed on the outer end cover 300, and sealing water is supplied to the mechanical seal through the water inlet and outlet holes 304, and then the pressure of the sealing water is used to resist the pressure of the medium conveyed by the medium end, so as to prevent the medium from passing through the friction surface of the static ring and the dynamic ring;

[0049] Meanwhile, a plurality of vertical disturbance grooves 130 are formed on the outer wall of the shaft sleeve 100 between the atmospheric end dynamic ring seat 121 and the medium end dynamic ring seat 111, and the disturbance grooves 130 are used to flow the water from the water inlet and outlet holes 304 to the medium end static ring and dynamic ring, so as to prevent the water from gathering at the tail end of the shaft sleeve and failing to enter the head end of the shaft sleeve when the shaft sleeve 100 rotates;

[0050] Notably, in the scheme, the pressure of the two groups of sealing element friction pairs is provided by the spring force, and as the spring force gradually decreases after long-term use, the sealing effect will gradually decrease, so in the scheme, the distance between the shaft sleeve and the rotating shaft 900 is adjusted to adjust the compression amount of the spring, so as to restore sufficient spring force and delay the replacement time of the spring.

[0051] Please refer to Figure 7 , specifically, the front end of the inner wall of the shaft sleeve 100 is provided with an internal thread 140, and the rotating shaft 900 is provided with an external thread 150 at the corresponding position, and the internal thread 140 and the external thread 150 are engaged with each other, and at least six positioning grooves 160 are formed on the front end of the shaft sleeve 100, and a positioning threaded hole 901 is formed on the side wall of the rotating shaft 900, and a positioning screw 902 is fixedly installed in the positioning threaded hole 901, and the positioning screw 902 is located in one of the positioning grooves 160, and when the shaft sleeve 100 is rotated, the position of the shaft sleeve 100 on the rotating shaft 900 can be adjusted, and the six positioning grooves 160 are arranged, so that the adjustment accuracy is one sixth of the pitch of the thread (internal thread 140 and external thread 150), and the adjustment accuracy is high, and the shaft sleeve 100 can be slowly adjusted according to the specific situation, and after the adjustment is completed, the shaft sleeve 100 can be fixed by the positioning screw 902 to prevent displacement relative to the rotating shaft 900;

[0052] When the utility is used, sealing water is introduced into the mechanical seal from one side of the water inlet and outlet hole 304, and the sealing water is discharged from the other side of the water inlet and outlet hole 304, and the water inlet and outlet hole 304 is connected to the water tank through the water pipe connected to the outside, forming a circulation; the water flow not only can take away most of the friction heat generated by the two groups of sealing element friction pairs (medium end dynamic ring and medium end static ring, atmospheric end static ring and atmospheric end dynamic ring), but also can fill the medium end static ring between the medium end dynamic ring, so that the medium entering the friction surface is reduced.

[0053] In the description of the utility model, it is necessary to explain, the term "upper", "lower", "inner", "outer", "left", "right" and so on indicate the orientation or positional relation is based on the orientation or positional relation shown in the drawing, or it is the orientation or positional relation that the utility model product uses usually places, or it is the orientation or positional relation that the person skilled in the art usually understands, just is convenient for describing the utility model and simplifying the description, and therefore can not be understood as indicating or implying that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore can not be understood as the restriction of the utility model. In addition, the term "first", "second" and so on are only used for distinguishing description, and can not be understood as indicating or implying relative importance. In the description of the utility model, it is also necessary to explain, unless otherwise expressly specified and limited, the terms "set", "connect" and so on should be understood broadly, for example, "connect" can be fixedly connected, also can be detachably connected, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be direct connection, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements inside. For the ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

Claims

1. A mechanical seal for a rotor pump comprising a bushing, characterized in that, The inner end cover and the outer end cover are respectively located at the front end and the rear end of the shaft sleeve, and the inner end cover and the outer end cover are fixedly connected through screws; meanwhile, the inner end cover is fixedly installed with a medium end static ring, and the inner end cover is fixedly installed with an atmosphere end static ring; the front and rear positions of the shaft sleeve are fixedly installed with a medium end dynamic ring and an atmosphere end dynamic ring; the front end of the inner wall of the shaft sleeve is provided with an internal thread, and the corresponding position of the rotating shaft is provided with an external thread, and the internal thread and the external thread are engaged with each other, and the front end of the shaft sleeve is provided with at least six positioning grooves, and the sidewall of the rotating shaft is provided with a positioning threaded hole, and a positioning screw is fixedly installed in the positioning threaded hole, and the positioning screw is located in one of the positioning grooves.

2. A mechanical seal for a rotor pump according to claim 1, characterized in that The first end of the shaft sleeve is integrally formed with a medium end dynamic ring seat, wherein the rear side of the medium end dynamic ring seat is fixedly installed with a medium end dynamic ring, and the medium end dynamic ring is fixedly connected with the medium end dynamic ring seat through a medium end dynamic ring pin to prevent the medium end dynamic ring from rotating relative to the medium end dynamic ring seat.

3. A mechanical seal for a rotor pump according to claim 1, characterized in that The tail end of the shaft sleeve is fixedly installed with an atmosphere end dynamic ring seat, and the outer circle of the atmosphere end dynamic ring seat is fixedly installed with an atmosphere end dynamic ring through an atmosphere end dynamic ring pin.

4. A mechanical seal for a rotor pump according to claim 3, characterized in that The shaft sleeve is provided with a shaft shoulder at the position close to the front end of the atmosphere end dynamic ring seat for abutting against the front end of the atmosphere end dynamic ring seat, and a tightening screw is further arranged between the atmosphere end dynamic ring seat and the shaft sleeve for fixing the atmosphere end dynamic ring seat and the shaft sleeve.

5. A mechanical seal for a rotor pump according to claim 1, wherein The front end of the inner end cover is fixedly installed with a medium end static ring through a medium end static ring pin; meanwhile, a medium end spring is further arranged between the inner end cover and the medium end static ring; and an O-ring is arranged between the inner wall of the inner end cover and the outer wall of the medium end static ring.

6. A mechanical seal for a rotor pump according to claim 1, wherein The top lower end of the outer end cover is fixedly installed with an atmosphere end static ring through an atmosphere end static ring pin; an atmosphere end spring is further arranged between the end of the atmosphere end static ring and the outer end cover.

7. A mechanical seal for a rotor pump according to claim 1, wherein Two water inlet and outlet holes are formed in the outer end cover.

8. A mechanical seal for a rotor pump according to claim 1, wherein The outer wall of the shaft sleeve between the atmosphere end dynamic ring seat and the medium end dynamic ring seat is provided with a plurality of vertically arranged disturbance grooves, and the disturbance grooves are used for backflowing the water from the water inlet and outlet holes to the medium end static ring and the dynamic ring.

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