Device for preventing dry grinding of pump

Abstract

The utility model provides a device for preventing a pump from dry grinding, which relates to the technical field of pump structures and comprises a pump shaft, a pump shell arranged on the outer surface of the pump shaft, an impeller fixedly connected to the outer surface of the pump shaft through a convex block, and a mechanical seal arranged between the pump shaft and the pump shell. A heat dissipation mechanism for cooling and a lubricating mechanism for preventing dry grinding are respectively arranged in the mechanical seal; the heat dissipation mechanism comprises a water pump, the output end of the water pump fixedly communicates with a liquid inlet pipe, and the liquid inlet pipe penetrates through the interior of the shell and fixedly communicates with a heat dissipation copper pipe. According to the device for preventing the pump from dry grinding, through matched arrangement of the heat dissipation mechanism and the lubricating mechanism, heat generated in a mechanical seal when the pump idles can be dissipated, lubricating oil can be dripped between a movable seal ring and a pump shaft, friction heat is effectively reduced, the trouble of manually disassembling the mechanical seal is omitted, time and labor are saved, and normal operation of the pump is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pump technical field, concretely is a kind of prevent pump dry grinding device. BACKGROUND

[0002] Pump is the mechanical of fluid delivery or fluid pressurization, mainly to transport water, lubricating oil, acid and alkali liquid, emulsion, suspension emulsion and liquid metal and so on Liquid, also can transport liquid, gas mixture and the liquid of containing suspended solid matter;Pump is the mechanical of high-speed rotation of impeller to the liquid of delivery pressurization, while the high-speed rotation of impeller, and the mechanical seal connected with pump core shaft also rotates at high speed, when the pump works normally, the liquid in the impeller will directly contact with mechanical seal, thereby cooling mechanical seal, however, when there is gas or broken liquid in the pump, mechanical seal cannot contact liquid, but still works, then the temperature of mechanical seal increases linearly, at high temperature, O-ring will deform first, then melt and burn out, at the same time, static ring and dynamic ring dry grinding seriously, appear abrasion, and static ring and dynamic ring lose sealing effect.

[0003] At present, when the pump is running under the condition of gas or broken liquid, the impeller will produce "empty running", commonly known as "dry grinding", at this time, the temperature in the mechanical seal will rise rapidly, and the rubber parts will melt in a short time, leading to sealing failure, which is easy to cause equipment damage, and there is also the risk of equipment explosion, in order to reduce the friction heat generated by dry grinding, the staff will disassemble the mechanical seal before using the pump and manually smear lubricating oil in the dynamic ring, which is not only time-consuming and laborious, but also more troublesome. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of prevent pump dry grinding device, to solve the dry grinding of pump in prior art, make temperature sharply increase, to cause sealing failure and cause equipment damage, in addition, the way of manual disassembly mechanical seal and smearing lubricating oil is time-consuming and laborious, more troublesome.

[0005] The utility model is realized by the following technical scheme: a kind of prevent pump dry grinding device, including pump shaft, the outer surface of the pump shaft is provided with pump shell, the outer surface of the pump shaft is fixedly connected with impeller by lug, mechanical seal is arranged between the pump shaft and pump shell, the mechanical seal includes housing, the inner portion of the mechanical seal is provided with heat dissipation mechanism for cooling and lubricating mechanism for preventing dry grinding respectively;

[0006] The heat dissipation mechanism includes water pump, the output end of the water pump is fixedly communicated with inlet pipe, the inlet pipe penetrates the inside of housing and is fixedly communicated with heat dissipation copper pipe, the inside of the heat dissipation copper pipe is provided with cooling liquid, the end of the heat dissipation copper pipe away from inlet pipe is fixedly communicated with outlet pipe, the end of the outlet pipe away from heat dissipation copper pipe is fixed with heat exchanger, the output end of the heat exchanger is fixedly communicated with suction pipe, the end of the suction pipe away from heat exchanger is fixedly communicated with the input end of water pump;

[0007] The lubrication mechanism includes a fixed tube, with a rubber dropper connected to the internal thread of the fixed tube. A sealing gasket is fixed to the outer surface of the rubber dropper, and the rubber dropper is sealed and snapped into the fixed tube by the sealing gasket.

[0008] Preferably, the outer surfaces of the water pump and the heat exchanger are both fixed to the outer surface of the pump casing, and the liquid outlet pipe passes through the outer surfaces of the casing and the pump casing in sequence.

[0009] Preferably, the mechanical seal further includes a stationary ring, a stationary ring sealing ring is provided between the housing and the stationary ring, a rotating ring is fixed on the outer surface of the pump shaft, a rotating ring sealing ring is provided between the rotating ring and the pump shaft, and the stationary ring is in contact with the rotating ring.

[0010] Preferably, the housing, the rotating ring, and the rotating ring sealing ring are all provided with through holes that are adapted to the fixed tube, and the interior of the through holes is fixed to the outer surface of the fixed tube.

[0011] Preferably, the outer surface of the housing is fixed to the pump housing.

[0012] This utility model provides a device for preventing pump dry running, which has the following beneficial effects:

[0013] 1. This pump dry running prevention device, through its heat dissipation mechanism, can dissipate the heat generated in the mechanical seal when the pump is running dry, preventing the temperature in the mechanical seal from rising rapidly and causing the dynamic ring seal to melt and fail. This not only ensures the normal operation of the pump but also extends the service life of the mechanical seal.

[0014] 2. This anti-dry-running device for the pump, through its lubrication mechanism, can drip lubricating oil between the dynamic ring seal and the pump shaft, thereby effectively reducing frictional heat and preventing the dynamic ring seal from melting and damaging the pump. It not only saves the trouble of manually disassembling the mechanical seal, saving time and effort, but also further ensures the normal operation of the pump. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the front view of this utility model;

[0016] Figure 2 This is a sectional view of the front view of this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the heat dissipation mechanism of this utility model;

[0018] Figure 4 This is an exploded view of the mechanical seal of this utility model;

[0019] Figure 5 This is an exploded view of the lubrication mechanism of this utility model;

[0020] Figure 6 This is a three-dimensional structural diagram of the impeller of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Pump shaft; 2. Pump casing; 3. Impeller;

[0023] 4. Mechanical Seal: 401. Housing; 402. Stationary Ring; 403. Stationary Ring Seal; 404. Rotating Ring; 405. Rotating Ring Seal;

[0024] 5. Heat dissipation mechanism: 501, water pump; 502, liquid inlet pipe; 503, copper heat dissipation pipe; 504, liquid outlet pipe; 505, heat exchanger; 506, liquid extraction pipe;

[0025] 6. Lubrication mechanism: 601. Fixed tube; 602. Dropper; 603. Sealing gasket; 604. Through hole. Detailed Implementation

[0026] This utility model provides a device for preventing pump dry running. Please refer to [link / reference]. Figures 1-6 It includes a pump shaft 1, a pump housing 2 is provided on the outer surface of the pump shaft 1, an impeller 3 is fixedly connected to the outer surface of the pump shaft 1 by a protrusion, and a mechanical seal 4 is provided between the pump shaft 1 and the pump housing 2. The mechanical seal 4 includes a housing 401, and a heat dissipation mechanism 5 for cooling and a lubrication mechanism 6 for preventing dry friction are respectively provided inside the mechanical seal 4.

[0027] Please see Figure 2 and Figure 4 The mechanical seal 4 also includes a stationary ring 402, a stationary ring seal 403 is provided between the housing 401 and the stationary ring 402, a rotating ring 404 is fixed on the outer surface of the pump shaft 1, a rotating ring seal 405 is provided between the rotating ring 404 and the pump shaft 1, and the stationary ring 402 is in contact with the rotating ring 404.

[0028] The outer surface of the housing 401 is fixed to the pump housing 2.

[0029] Please see Figure 3The heat dissipation mechanism 5 includes a water pump 501. The output end of the water pump 501 is fixedly connected to an inlet pipe 502. The inlet pipe 502 penetrates the interior of the housing 401 and is fixedly connected to a heat dissipation copper pipe 503. Coolant is disposed inside the heat dissipation copper pipe 503. An outlet pipe 504 is fixedly connected to the end of the heat dissipation copper pipe 503 away from the inlet pipe 502. A heat exchanger 505 is fixedly connected to the end of the outlet pipe 504 away from the heat dissipation copper pipe 503. A suction pipe 506 is fixedly connected to the output end of the heat exchanger 505. The end of the suction pipe 506 away from the heat exchanger 505 is fixedly connected to the input end of the water pump 501. A large amount of heat is generated in the mechanical seal 4, which is then dissipated by… Due to the thermal conductivity of the heat dissipation copper pipe 503 in the heat dissipation mechanism 5, it can absorb the heat inside the housing 401. Then, through the condensation and transformation of the coolant in the heat dissipation copper pipe 503, the heat can be output to the heat exchanger 505. The heat exchanger 505 can cool the coolant. Then, the water pump 501 is started, which can draw the coolant through the liquid extraction pipe 506 and deliver it to the heat dissipation copper pipe 503. This circulation can quickly remove the heat inside the housing 401, avoiding the situation where the temperature inside the housing 401 rises and the dynamic ring seal 405 melts, causing the seal to fail. This not only ensures the normal operation of the pump, but also extends the service life of the mechanical seal 4.

[0030] The outer surfaces of the water pump 501 and the heat exchanger 505 are fixed to the outer surface of the pump casing 2, and the liquid outlet pipe 504 passes through the outer surfaces of the casing 401 and the pump casing 2 in sequence.

[0031] Please see Figure 4 and Figure 5 The lubrication mechanism 6 includes a fixed tube 601, with a rubber dropper 602 connected to the inside of the fixed tube 601 by internal threads. A sealing gasket 603 is fixed to the outer surface of the rubber dropper 602, and the rubber dropper 602 is sealed and snapped into the fixed tube 601 through the sealing gasket 603. When the pump experiences dry friction, squeezing the dropper 602 allows lubricating oil to drip from the fixed tube 601 into the space between the dynamic ring seal 405 and the pump shaft 1. This forms an oil film on the contact surface between the dynamic ring seal 405 and the pump shaft 1, effectively reducing frictional heat and preventing the dynamic ring seal 405 from melting and damaging the pump. This not only saves time and effort by eliminating the need for manual disassembly of the mechanical seal 4, but also further ensures the normal operation of the pump. Before running the pump, unscrewing the dropper 602 removes it from the fixed tube 601, draws in lubricating oil, and then reconnects it to the fixed tube 601 via thread. This ensures the pump's sealing during operation and prevents frictional heat generated by dry friction between the dynamic ring seal 405 and the pump shaft 1, which could damage the pump.

[0032] The housing 401, the rotating ring 404 and the rotating ring sealing ring 405 are all provided with through holes 604 that are adapted to the fixed tube 601. The interior of the through holes 604 is fixed to the outer surface of the fixed tube 601.

[0033] In use, when the pump operates with gas or without liquid, a large amount of heat is generated in the mechanical seal 4. Due to the thermal conductivity of the heat dissipation copper pipe 503 in the heat dissipation mechanism 5, the heat inside the housing 401 is absorbed. The heat is then transferred to the heat exchanger 505 through the condensation and conversion of the coolant in the heat dissipation copper pipe 503. The heat exchanger 505 cools the coolant. Then, the water pump 501 is started, drawing coolant through the suction pipe 506 and delivering it to the heat dissipation copper pipe 503. This cycle quickly removes the heat from inside the housing 401, preventing the temperature inside the housing 401 from rising. In the event of the dynamic ring seal 405 melting and causing seal failure, this not only ensures the normal operation of the pump but also extends the service life of the mechanical seal 4. When the pump experiences dry running, squeezing the dropper 602 allows the lubricating oil in the dropper 602 to drip from the fixed tube 601 between the dynamic ring seal 405 and the pump shaft 1, forming an oil film on the contact surface between the dynamic ring seal 405 and the pump shaft 1. This effectively reduces frictional heat and prevents the dynamic ring seal 405 from melting and damaging the pump. This not only saves time and effort by eliminating the hassle of manually disassembling the mechanical seal 4 but also further ensures the normal operation of the pump.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A device for preventing dry running of a pump, comprising a pump shaft (1), characterized in that: The outer surface of the pump shaft (1) is provided with a pump shell (2), the outer surface of the pump shaft (1) is fixedly connected with an impeller (3) through a protruding block, a mechanical seal (4) is arranged between the pump shaft (1) and the pump shell (2), the mechanical seal (4) comprises a shell (401), and a heat dissipation mechanism (5) for cooling and a lubricating mechanism (6) for preventing dry grinding are arranged in the mechanical seal (4) respectively. The heat dissipation mechanism (5) comprises a water pump (501), an inlet pipe (502) is fixedly communicated with the output end of the water pump (501), the inlet pipe (502) penetrates the inside of the shell (401) and is fixedly communicated with a heat dissipation copper pipe (503), the inside of the heat dissipation copper pipe (503) is provided with cooling liquid, one end of the heat dissipation copper pipe (503) away from the inlet pipe (502) is fixedly communicated with an outlet pipe (504), the end of the outlet pipe (504) away from the heat dissipation copper pipe (503) is fixedly provided with a heat exchanger (505), the output end of the heat exchanger (505) is fixedly communicated with a liquid pumping pipe (506), and the end of the liquid pumping pipe (506) away from the heat exchanger (505) is fixedly communicated with the input end of the water pump (501). The lubricating mechanism (6) comprises a fixed pipe (601), a rubber head dropper (602) is screw-connected in the inside of the fixed pipe (601), and a sealing gasket (603) is fixedly arranged on the outer surface of the rubber head dropper (602).

2. A device for preventing dry running of a pump according to claim 1, characterized in that: The outer surfaces of the water pump (501) and the heat exchanger (505) are fixed with the outer surface of the pump shell (2), and the outlet pipe (504) penetrates the outer surfaces of the shell (401) and the pump shell (2) in sequence.

3. A device for preventing dry running of a pump as claimed in claim 1, wherein: The mechanical seal (4) further comprises a static ring (402), a static ring sealing ring (403) is arranged between the shell (401) and the static ring (402), a dynamic ring (404) is fixedly arranged on the outer surface of the pump shaft (1), a dynamic ring sealing ring (405) is arranged between the dynamic ring (404) and the pump shaft (1), and the static ring (402) is in contact with the dynamic ring (404).

4. A device for preventing dry running of a pump according to claim 3, wherein: The inside of the shell (401), the dynamic ring (404) and the dynamic ring sealing ring (405) are all provided with a through hole (604) matched with the fixed pipe (601), and the inside of the through hole (604) is fixed with the outer surface of the fixed pipe (601).

5. A device for preventing dry running of a pump as claimed in claim 1, wherein: The outer surface of the shell (401) is fixed with the pump shell (2).

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