Vertical pump with built-in mechanical seal

Abstract

The utility model provides a vertical pump with a built-in mechanical seal. Comprising a water tank containing a preset amount of fluid, a pump body arranged in the water tank, a pump cover arranged on the inner wall of the lower end of the pump body, a pump cavity formed between the pump body and the pump cover, and a liquid inlet formed in the pump cover, communicated with the pump cavity and used for allowing the fluid to enter the pump cavity. When the vertical pump works and the water level of fluid in the water tank is gradually lowered, air in the driving cavity can be prevented from entering the pump cavity, so that the situation that the fluid in the pump cavity is difficult to flow out of the water tank or even cannot flow out of the water tank is avoided, and working of the vertical pump is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of vertical pumps, in particular to a vertical pump with a built-in mechanical seal. Background Art

[0002] Vertical pumps are mainly used to transport fluids. The main working principle of vertical pumps is to drive the impeller to rotate through a motor, thereby sucking in and discharging the fluid.

[0003] Existing vertical pumps are as follows Figure 1 , Figure 2 As shown, the vertical pump comprises a water tank 0' with a predetermined amount of fluid, a pump body 1' arranged in the water tank 0', a pump cover 2' arranged on the inner wall of the lower end of the pump body 1', a pump chamber 3' formed between the pump body 1' and the pump cover 2', a liquid inlet 4' opened on the pump cover 2' and connected to the pump chamber 3' for the fluid to enter the pump chamber 3', a liquid outlet pipe 5' with one end arranged on the pump body 1' and connected to the pump chamber 3' and the other end passing through the water tank 0' and connected to an external device for the fluid in the pump chamber 3' to flow out of the water tank 0', a drive pipe 5' penetrating the pump body 1' and connected to the pump chamber 3' a dynamic chamber 6', an impeller 7' rotatably arranged between the pump chamber 3' and the driving chamber 6' for driving the fluid in the pump chamber 3' to flow out of the water tank 0', a connecting seat 8' arranged on the upper end surface of the pump body 1' and connected to the outer wall 0' of the water tank, a through hole 9' opened on the connecting seat 8' and located above the driving chamber 6' and communicating with the driving chamber 6', a rotating motor body 10' arranged on the connecting seat 8', and a driving shaft 11' arranged on the rotating motor body 10' and passing through the through hole 9' to enter the driving chamber 6' and fixedly connected to the impeller 7' for driving the impeller 7' to move.

[0004] Although the above-mentioned vertical pump can solve the corresponding technical problems, there are still certain defects in the use process:

[0005] When the vertical pump is working and the fluid water level in the water tank 0' gradually decreases, it is impossible to prevent the air in the driving chamber 6' from entering the pump chamber 3', so that the fluid in the pump chamber 3' is difficult or even unable to flow out of the water tank 0', which is not conducive to the operation of the vertical pump. Utility Model Content

[0006] The utility model aims to provide a vertical pump with a built-in mechanical seal in view of the defects and shortcomings of the prior art.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A vertical pump with a built-in mechanical seal, comprising a water tank with a predetermined amount of fluid, a pump body arranged in the water tank, a pump cover arranged on the inner wall of the lower end of the pump body, a pump chamber formed between the pump body and the pump cover, a liquid inlet opened on the pump cover and connected to the pump chamber for fluid to enter the pump chamber, a liquid outlet pipe with one end arranged on the pump body and connected to the pump chamber and the other end passing through the water tank and connected to an external device for the fluid in the pump chamber to flow out of the water tank, a drive chamber penetrating the pump body and connected to the pump chamber, an impeller rotatably arranged between the pump chamber and the drive chamber for driving the fluid in the pump chamber to flow out of the water tank, and an impeller arranged at The pump body has an upper end surface and a connection seat connected to the outer wall of the water tank, a through hole opened on the connection seat and located above the drive cavity and connected to the drive cavity, a rotating motor body arranged on the connection seat, and a driving shaft arranged on the rotating motor body and passing through the through hole to enter the drive cavity and fixedly connected to the impeller for driving the impeller to move, and also includes a built-in mechanical sealing device, the built-in mechanical sealing device is arranged between the impeller, the pump body, and the driving shaft and is located in the drive cavity, and the built-in mechanical sealing device is used to prevent the air in the drive cavity from entering the pump cavity when the vertical pump is working and the water level of the fluid in the water tank gradually decreases;

[0009] The built-in mechanical sealing device comprises a fixed ring seat, which is arranged on the pump body and located in the driving cavity, and the fixed ring seat is located above the impeller and outside the driving shaft;

[0010] A stationary ring, the stationary ring is fixedly arranged on the inner wall of the upper end of the stationary ring seat, and the stationary ring is located outside the driving shaft;

[0011] A shaft sleeve with a telescopic function at the middle end, the lower end of the shaft sleeve abuts against the impeller and the upper end is located below the static ring, and the shaft sleeve is located outside the drive shaft;

[0012] A dynamic ring, which is fixedly arranged on the inner wall of the upper end of the sleeve, is located outside the drive shaft, and is used to continuously press against the static ring;

[0013] The abutting driving member is arranged between the lower end of the sleeve and the upper end of the sleeve, and is used to drive the middle end of the sleeve to extend so as to drive the dynamic ring on the inner wall of the upper end of the sleeve to continuously abut against the static ring.

[0014] A further improvement is that: the abutting driving member includes a lower limit ring plate, and the lower limit ring plate is fixedly arranged on the outer wall of the lower end of the shaft sleeve;

[0015] An upper limit ring plate, the upper limit ring plate is fixedly arranged on the outer wall of the upper end of the shaft sleeve;

[0016] A compression spring is arranged between the lower limit ring plate and the upper limit ring plate, and the compression spring is located outside the shaft sleeve.

[0017] A further improvement is that a connecting sleeve is provided on the inner wall of the upper end of the fixed ring seat, and the static ring is fixedly provided on the connecting sleeve.

[0018] Further improvements are: the inner wall of the lower end of the sleeve is sealed against the drive shaft, and / or a gap is formed between the fixed ring seat and the impeller, the gap is used for fluid to enter to take away the heat generated by the dynamic ring and the static ring, thereby extending the service life of the dynamic ring and the static ring.

[0019] A further improvement is that a baffle plate is fixedly provided on the inner wall of the pump body and in the driving cavity, the baffle plate is located outside the driving shaft, the baffle plate is located above the fixed ring seat, and a plurality of flow holes are provided on the pump body and below the baffle plate for fluid to enter the driving cavity so as to take away the heat generated by the dynamic ring and the static ring, thereby extending the service life of the dynamic ring and the static ring.

[0020] A further improvement is that the pump cover is threadedly connected to the inner wall of the lower end of the pump body, an annular groove is provided on the inner wall of the lower end of the pump body below the pump cover, an arc-shaped limit plate is provided on the pump body in the annular groove, and the arc-shaped limit plate is connected to the pump cover by at least two bolts.

[0021] A further improvement is that a filter screen with a ball check valve is provided on the lower end surface of the pump cover and outside the liquid inlet for filtering the fluid before the fluid enters the liquid inlet.

[0022] A further improvement is that the fixing ring seat is threadedly connected to the pump body, and the upper end surface of the fixing ring seat is provided with a plurality of matching grooves for cooperating with external tools to facilitate the threaded connection of the fixing ring seat to the pump body.

[0023] A further improvement is that the end of the drive shaft away from the rotating motor body passes through the impeller, and a locking cap is detachably provided on the outside of the end of the drive shaft away from the rotating motor body, the locking cap abuts against the impeller, and a sealing ring is provided between the locking cap and the impeller.

[0024] After adopting the above technical scheme, the beneficial effect of the utility model is: when the vertical pump is working and the water level of the fluid in the water tank gradually decreases, it can prevent the air in the driving chamber from entering the pump chamber, thereby preventing the fluid in the pump chamber from being difficult or even unable to flow out of the water tank, which is beneficial to the operation of the vertical pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a structural schematic diagram of an existing vertical pump;

[0027] Figure 2 It corresponds to Figure 1 Sectional views that hide some parts;

[0028] Figure 3 It is a structural schematic diagram of the utility model;

[0029] Figure 4 It corresponds to Figure 3 Sectional views that hide some parts;

[0030] Figure 5 It corresponds to Figure 4 A magnified view of part A;

[0031] Figure 6 It corresponds to Figure 4 A magnified view of part B;

[0032] Figure 7 It is a structural schematic diagram of a pump cover, an arc-shaped limiting plate and bolts in the utility model.

[0033] Explanation of the accompanying drawings: water tank 0', pump body 1', pump cover 2', pump chamber 3', liquid inlet 4', liquid outlet pipe 5', drive chamber 6', impeller 7', connecting seat 8', through hole 9', rotating motor body 10', drive shaft 11', water tank 0, pump body 1, pump cover 2, pump chamber 3, liquid inlet 4, liquid outlet pipe 5, drive chamber 6, impeller 7, connecting seat 8, through hole 9, rotating motor body 10, drive shaft 11, fixed ring seat 12, static ring 13, sleeve 14, dynamic ring 15, baffle plate 16, lower limit ring plate 17, upper limit ring plate 18, compression spring 19, connecting sleeve 20, gap 21, ring groove 22, arc limit plate 23, bolt 24, filter screen cover 25, matching groove 26, lock cap 27, sealing ring 28, steel sleeve 29, flow hole 30. DETAILED DESCRIPTION

[0034] The utility model is now further described in conjunction with the accompanying drawings and specific embodiments.

[0035] See also Figures 3 to 7 As shown, the technical solution adopted in this specific implementation is:

[0036] A vertical pump with a built-in mechanical seal comprises a water tank 0 with a predetermined amount of fluid, a pump body 1 arranged in the water tank 0, a pump cover 2 arranged on the inner wall of the lower end of the pump body 1, a pump chamber 3 formed between the pump body 1 and the pump cover 2, a liquid inlet 4 opened on the pump cover 2 and connected to the pump chamber 3 for the fluid to enter the pump chamber 3, a liquid outlet pipe 5 one end of which is arranged on the pump body 1 and connected to the pump chamber 3 and the other end of which passes through the water tank 0 and is connected to an external device for the fluid in the pump chamber 3 to flow out of the water tank 0, a drive chamber 6 penetrating the pump body 1 and connected to the pump chamber 3, an impeller 7 rotatably arranged between the pump chamber 3 and the drive chamber 6 for driving the fluid in the pump chamber 3 to flow out of the water tank 0, and a pump cover 2 arranged on the pump body 1 and connected to the pump chamber 3. A connecting seat 8 is placed on the upper end surface of the pump body 1 and connected to the outer wall 0 of the water tank, a through hole 9 is opened on the connecting seat 8 and is located above the driving chamber 6 and communicated with the driving chamber 6, a rotating motor body 10 is arranged on the connecting seat 8, and a driving shaft 11 is arranged on the rotating motor body 10 and passes through the through hole 9 to enter the driving chamber 6 and is fixedly connected to the impeller 7 for driving the impeller 7 to move, and also includes a built-in mechanical sealing device, which is arranged between the impeller 7, the pump body 1, and the driving shaft 11 and is located in the driving chamber 6. The built-in mechanical sealing device is used to prevent the air in the driving chamber 6 from entering the pump chamber 3 when the vertical pump is working and the water level of the fluid in the water tank 0 gradually decreases;

[0037] The built-in mechanical sealing device includes a fixed ring seat 12, which is arranged on the pump body 1 and located in the driving chamber 6. The fixed ring seat 12 is located above the impeller 7 and outside the driving shaft 11;

[0038] The stationary ring 13 is fixedly arranged on the inner wall of the upper end of the fixed ring seat 12, and the stationary ring 13 is located outside the driving shaft 11;

[0039] The middle end of the sleeve 14 has a telescopic function, the lower end of the sleeve 14 abuts against the impeller 7 and the upper end is located below the static ring 13, and the sleeve 14 is located outside the drive shaft 11;

[0040] A moving ring 15, which is fixedly disposed on the inner wall of the upper end of the sleeve 14, and is located outside the driving shaft 11, and is used to continuously press against the stationary ring 13;

[0041] A holding and abutting driving member, which is disposed between the lower end of the sleeve 14 and the upper end of the sleeve 14, and is used to drive the middle end of the sleeve 14 to extend so as to drive the dynamic ring 15 on the inner wall of the upper end of the sleeve 14 to continuously abut against the static ring 13;

[0042] A baffle plate 16 is fixedly arranged on the inner wall of the pump body 1 and located in the driving chamber 6. The baffle plate 16 is located outside the driving shaft 11 and above the fixed ring seat 12. A plurality of flow holes 30 are arranged on the pump body 1 and below the baffle plate 16 for fluid to enter the driving chamber 6 so as to take away the heat generated by the dynamic ring 15 and the static ring 13, thereby extending the service life of the dynamic ring 15 and the static ring 13. The baffle plate 16 is used to reduce the flow of fluid from the plurality of flow holes 30 to the top of the baffle plate 16. A sealing ring that fits the driving shaft 11 may be arranged on the inner wall of the baffle plate 16.

[0043] The holding and abutting driving member includes a lower limit ring plate 17, and the lower limit ring plate 17 is fixedly arranged on the outer wall of the lower end of the shaft sleeve 14;

[0044] An upper limit ring plate 18, the upper limit ring plate 18 is fixedly arranged on the outer wall of the upper end of the shaft sleeve 14;

[0045] The compression spring 19 is disposed between the lower limit ring plate 17 and the upper limit ring plate 18 , and the compression spring 19 is located outside the shaft sleeve 14 .

[0046] The inner wall of the upper end of the fixed ring seat 12 is provided with a connecting sleeve 20, and the stationary ring 13 is fixedly arranged on the connecting sleeve 20;

[0047] The inner wall of the lower end of the sleeve 14 is sealed against the drive shaft 11 , and a gap 21 is formed between the fixed ring seat 12 and the impeller 7 , and the gap 21 is used for fluid to enter to take away the heat generated by the dynamic ring 15 and the static ring 14 , thereby extending the service life of the dynamic ring 15 and the static ring 14 .

[0048] The pump cover 2 is threadedly connected to the inner wall of the lower end of the pump body 1. The inner wall of the lower end of the pump body 1 is provided with an annular groove 22 below the pump cover 2. An arc-shaped limit plate 23 is provided on the pump body 1 in the annular groove 22. The arc-shaped limit plate 23 is connected to the pump cover 2 by at least two bolts 24. The arc-shaped limit plate 23 has a predetermined elastic coefficient so that it can be closed when subjected to a predetermined external force and remain in its original state when not subjected to a predetermined external force. A filter screen cover 25 with a ball-type check valve is provided on the lower end surface of the pump cover 2 and outside the liquid inlet 4 to filter the fluid before the fluid enters the liquid inlet 4. A sealing ring is provided between the pump cover 2 and the pump body 1. A sealing ring is provided between the ball-type check valve of the filter screen cover 25 and the pump cover 2.

[0049] The fixed ring seat 12 is threadedly connected to the pump body 1, and a sealing ring gasket is provided between the fixed ring seat 12 and the pump body 1, or other sealing treatment is performed. The upper end surface of the fixed ring seat 12 is provided with several matching grooves 26 for cooperating with external tools to facilitate the threaded connection of the fixed ring seat 12 to the pump body 1.

[0050] The end of the drive shaft 11 away from the rotating motor body 10 passes through the impeller 7, and a lock cap 27 is detachably provided on the outside of the end of the drive shaft 11 away from the rotating motor body 10. The lock cap 27 abuts against the impeller 7, and a sealing ring 28 is provided between the lock cap 27 and the impeller 7. The end of the drive shaft 11 away from the rotating motor body 10 is threadedly connected with the lock cap 27.

[0051] A steel sleeve 29 is fixedly provided on the inner wall of the impeller 7 and located in the driving chamber 6 . The steel sleeve 29 is fixedly connected to the driving shaft 11 .

[0052] When the fluid is corrosive, the relevant parts of the vertical pump can be treated with anti-corrosion or made of corrosion-resistant materials to increase the service life of the vertical pump. The relevant joints of the vertical pump can be sealed or equipped with sealing rings and other parts.

[0053] The working principle of the utility model is as follows: through the coordinated arrangement of the fixed ring seat 12, the static ring 13, the shaft sleeve 14 with telescopic function at the middle end, the dynamic ring 15, and the supporting driving member, when the vertical pump is working and the fluid water level in the water tank 0 gradually decreases, the air in the driving chamber 6 can be prevented from entering the pump chamber 3.

[0054] When the vertical pump is working and the fluid water level in the water tank 0 drops to the lower end surface of the pump body, it can also prevent the air in the driving chamber 6 from entering the pump chamber 3; the vertical pump can work continuously or be shut down and then restarted.

[0055] The contents not described in detail in the utility model specification belong to the prior art known to those skilled in the art. The utility model is to protect the structure of the product, and the model of each component is not the content of the utility model protection, which is also the prior art known to those skilled in the art. Any component on the market that can achieve the above functions of the utility model can be selected and applied.

[0056] The basic principles, main features and advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

Claims

1. A vertical pump with a built-in mechanical seal, comprising a water tank with a predetermined amount of fluid, a pump body arranged in the water tank, a pump cover arranged on the inner wall of the lower end of the pump body, a pump chamber formed between the pump body and the pump cover, a liquid inlet opened on the pump cover and connected to the pump chamber for fluid to enter the pump chamber, a liquid outlet pipe one end of which is arranged on the pump body and connected to the pump chamber and the other end of which passes through the water tank and communicates with an external device for the fluid in the pump chamber to flow out of the water tank, a driving chamber penetrating and arranged on the pump body and connected to the pump chamber, an impeller rotatably arranged between the pump chamber and the driving chamber for driving the fluid in the pump chamber to flow out of the water tank, a connecting seat arranged on the upper end surface of the pump body and connected to the outer wall of the water tank, a through hole opened on the connecting seat above the driving chamber and connected to the driving chamber, a rotating motor body arranged on the connecting seat, and a driving shaft arranged on the rotating motor body and passing through the through hole to enter the driving chamber and fixedly connected to the impeller for driving the impeller to move, characterized in that: It also includes a built-in mechanical sealing device, which is arranged between the impeller, the pump body and the drive shaft and is located in the drive cavity. The built-in mechanical sealing device is used to prevent the air in the drive cavity from entering the pump cavity when the vertical pump is working and the water level of the fluid in the water tank gradually decreases; The built-in mechanical sealing device comprises a fixed ring seat, the fixed ring seat is arranged on the pump body and located in the driving cavity, the fixed ring seat is located above the impeller and outside the driving shaft; A stationary ring, the stationary ring is fixedly arranged on the inner wall of the upper end of the stationary ring seat, and the stationary ring is located outside the driving shaft; A shaft sleeve with a telescopic function at the middle end, the lower end of the shaft sleeve abuts against the impeller and the upper end is located below the static ring, and the shaft sleeve is located outside the drive shaft; A dynamic ring, which is fixedly arranged on the inner wall of the upper end of the sleeve, is located outside the drive shaft, and is used to continuously press against the static ring; The abutting driving member is arranged between the lower end of the sleeve and the upper end of the sleeve, and is used to drive the middle end of the sleeve to extend so as to drive the dynamic ring on the inner wall of the upper end of the sleeve to continuously abut against the static ring.

2. A vertical pump with a built-in mechanical seal according to claim 1, characterized in that: The holding and abutting driving member includes a lower limit ring plate, and the lower limit ring plate is fixedly arranged on the outer wall of the lower end of the shaft sleeve; An upper limit ring plate, the upper limit ring plate is fixedly arranged on the outer wall of the upper end of the shaft sleeve; A compression spring is arranged between the lower limit ring plate and the upper limit ring plate, and the compression spring is located outside the shaft sleeve.

3. A vertical pump with a built-in mechanical seal according to claim 1, characterized in that: The inner wall of the upper end of the fixed ring seat is provided with a connecting sleeve, and the static ring is fixedly arranged on the connecting sleeve.

4. A vertical pump with a built-in mechanical seal according to claim 1, characterized in that: The inner wall of the lower end of the sleeve is sealed against the drive shaft, and / or a gap is formed between the fixed ring seat and the impeller, and the gap is used for fluid to enter to remove the heat generated by the dynamic ring and the static ring, thereby extending the service life of the dynamic ring and the static ring.

5. A vertical pump with a built-in mechanical seal according to claim 1, characterized in that: A baffle plate is fixedly provided on the inner wall of the pump body and in the driving cavity. The baffle plate is located outside the driving shaft and above the fixed ring seat. Several flow holes are provided on the pump body and below the baffle plate for fluid to enter the driving cavity so as to take away the heat generated by the dynamic ring and the static ring, thereby extending the service life of the dynamic ring and the static ring.

6. A vertical pump with a built-in mechanical seal according to claim 1, characterized in that: The pump cover is threadedly connected to the inner wall of the lower end of the pump body. The inner wall of the lower end of the pump body is provided with an annular groove below the pump cover. An arc-shaped limit plate is provided on the pump body in the annular groove. The arc-shaped limit plate is connected to the pump cover by at least two bolts.

7. A vertical pump with a built-in mechanical seal according to claim 1, characterized in that: A filter screen with a ball-type check valve for filtering the fluid before the fluid enters the liquid inlet is arranged on the lower end surface of the pump cover and outside the liquid inlet.

8. A vertical pump with a built-in mechanical seal according to claim 1, characterized in that: The fixing ring seat is threadedly connected to the pump body, and the upper end surface of the fixing ring seat is provided with a plurality of matching grooves for matching with external tools to facilitate the fixing ring seat to be threadedly connected to the pump body.

9. A vertical pump with a built-in mechanical seal according to claim 1, characterized in that: The end of the drive shaft away from the rotating motor body passes through the impeller, and a locking cap is detachably provided on the outside of the end of the drive shaft away from the rotating motor body. The locking cap abuts against the impeller, and a sealing ring is provided between the locking cap and the impeller.

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