Pump body motor connection cooling circulation structure

Abstract

The utility model relates to a pump body motor connection cooling circulation structure which is arranged between a motor and a pump body, a straight connecting shaft of the motor is connected with an impeller in the pump body, the pump body is connected with a flange plate of the motor through a cover plate and a connecting cover in sequence, a circulating water containing cavity is formed between the connecting cover and the cover plate, and a cooling water outlet is formed in the pump body. A circulating water inlet and a circulating water outlet are formed in the two opposite sides of the circulating water containing cavity respectively, mechanical seal positions matched with the straight connecting shaft are arranged at the centers of the cover plate and the connecting cover, a static ring for low-pressure mechanical seal is arranged on the mechanical seal position of the connecting cover, a static ring for high-pressure mechanical seal is arranged on the mechanical seal position of the cover plate, and a circulating water inlet and a circulating water outlet are formed in the two opposite sides of the circulating water containing cavity respectively. And moving rings of the low-pressure mechanical seal and the high-pressure mechanical seal are fixed on the straight connecting shaft. The double mechanical seals are adopted, the connecting cover is provided with an outer circulation water cooling structure, when high-temperature and low-temperature media are pumped, heat of the pumped media can be prevented from being transmitted to the bearing and the motor supporting piece, heat transmission between the motor end and the water pump end is isolated, and the service life of the water pump is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of connecting covers for water pumps, in particular to a pump body motor connecting cooling circulation structure. Background Art

[0002] A conventional water pump consists of a pump body with an impeller mounted within it. A motor is installed at one end of the pump body to drive the impeller. In the prior art, there is no separate structure between the pump body and the motor. Instead, they are connected solely by flanges on the pump body and motor sides. At most, several supporting ribs are installed between the flanges as a connecting bracket for thermal insulation.

[0003] Such a connecting bracket is only suitable for pumping medium with a lower temperature between 0℃ and 80℃. When the temperature of the medium transported by the pump is between 80℃ and 150℃, the reliability of the pump's mechanical seal will decrease, wear will increase, and the service life will be shortened. For direct-connected pumps, high-temperature media will also cause the heat of the pumped medium to be transferred to the bearings and motor support parts, causing the bearing temperature to increase and performance to decrease. The consequence may be deformation of the support parts, and ultimately the unit cannot operate normally. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a pump body motor connection cooling circulation structure, which connects the pump body and the motor and performs cooling circulation on the connection cover to increase the reliability and service life of the water pump unit.

[0005] The technical solution adopted by the utility model to solve its technical problems is: to provide a pump body motor connection cooling circulation structure, which is arranged between a motor with a flange and a pump body without a flange, the direct-connected shaft of the motor is connected to the impeller in the pump body, and the pump body is connected to the flange of the motor in turn through a cover plate and a connecting cover, a circulating water holding chamber is formed between the connecting cover and the cover plate, and a circulating water inlet and a circulating water outlet are respectively provided on two opposite sides of the circulating water holding chamber, a machine seal position matching the direct-connected shaft is provided at the center of the cover plate and the connecting cover, a static ring of a low-pressure mechanical seal is provided on the machine seal position of the connecting cover, a static ring of a high-pressure mechanical seal is provided on the machine seal position of the cover plate, and the dynamic rings of the low-pressure mechanical seal and the high-pressure mechanical seal are fixed on the direct-connected shaft.

[0006] Preferably, a sealing groove is provided at the contact edge between the connecting cover and the cover plate, and a sealing ring is provided in the sealing groove for preventing water leakage from the circulating water holding chamber.

[0007] Preferably, an exhaust hole for connecting the interior of the pump body with the outside is provided on the cover plate, and an exhaust valve is provided on the surface of the cover plate and at the end of the exhaust hole.

[0008] Preferably, when the water pump is arranged upright and the motor is located above the water pump, the height of the circulating water inlet is lower than the circulating water outlet, and the height of the circulating water outlet is higher than the friction surface of the dynamic and static rings of the low-pressure mechanical seal.

[0009] Preferably, when the water pump is arranged horizontally, the circulating water inlet is located at the bottom of the connecting cover, and the circulating water outlet is located at the top of the connecting cover.

[0010] The beneficial effects are: the utility model adopts high and low pressure dual mechanical seals, and the connecting cover is provided with an external circulation water cooling structure. When pumping high-temperature and low-temperature media, the heat of the pumped medium can be prevented from being transferred to the bearings and motor supports, and the heat transfer between the motor end and the water pump end is isolated. When the temperature of the pumped medium is higher than 80℃~150℃, the reliability of the mechanical seal can be enhanced, wear can be reduced, and the service life can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The figure is a cross-sectional diagram of a pump body motor connection cooling cycle structure.

[0012] Among them, 101-circulating water inlet; 102-circulating water outlet; 1-cover plate; 2-connecting cover; 3-low-pressure mechanical seal; 4-direct connecting shaft; 5-sealing ring; 6-high-pressure mechanical seal; 7-exhaust valve. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and that such equivalents also fall within the scope of the claims appended hereto.

[0014] like Figure 1 As shown, the utility model provides a pump body motor connection cooling circulation structure, which is arranged between a motor with a flange and a pump body without a flange, the direct-connected shaft 4 of the motor is connected to the impeller in the pump body, and the pump body is connected to the flange of the motor through a cover plate 1 and a connecting cover 2 in turn, and a circulating water holding chamber is formed between the connecting cover 2 and the cover plate 1, and a circulating water inlet 101 and a circulating water outlet 102 are respectively provided on two opposite sides of the circulating water holding chamber, and a machine seal position matching the direct-connected shaft 4 is provided at the center of the cover plate 1 and the connecting cover 2, and a static ring of a low-pressure mechanical seal 3 is provided on the machine seal position of the connecting cover 2, and a static ring of a high-pressure mechanical seal 6 is provided on the machine seal position of the cover plate 1, and the dynamic rings of the low-pressure mechanical seal 3 and the high-pressure mechanical seal 6 are fixed on the direct-connected shaft 4.

[0015] A sealing groove is provided at the contact edge between the connecting cover 2 and the cover plate 1 , and a sealing ring 5 is provided in the sealing groove to prevent water leakage from the circulating water receiving chamber.

[0016] The cover plate 1 is provided with an exhaust hole for connecting the inside of the pump body with the outside, and an exhaust valve 7 is provided on the surface of the cover plate 1 and at the end of the exhaust hole. When the water pump unit is running, the exhaust valve 7 can be used to exhaust the air in the unit.

[0017] In a specific embodiment, when the water pump is arranged upright and the motor is installed above the water pump, the height of the circulating water inlet 101 is lower than the circulating water outlet 102, and the height of the circulating water outlet 102 is higher than the friction surface of the dynamic and static rings of the low-pressure mechanical seal 3.

[0018] In another embodiment, when the water pump is arranged horizontally, the circulating water inlet 101 is located at the bottom of the connection cover 2 , and the circulating water outlet 102 is located at the top of the connection cover 2 .

[0019] When the utility model is in use, when the temperature of the pumped medium is higher than 80℃~150℃, the cooling water is first passed before operation, and then the water pump unit is started. Before stopping, the water pump unit is first stopped, and then the cooling water is turned off. During operation, the cooling circulating water flows in from the circulating water inlet 101. The cooling circulating water is usually at a pressure of 2-3kg / cm 2 , water volume is 0.3-0.7m 3 / h of normal temperature softened water. Since the position of the circulating water inlet 101 is relatively low, after the cooling water enters the closed cavity formed by the cover plate 1 and the connecting cover 2, it will flow into the static ring friction surface along the static ring gap between the direct-connected shaft 4 and the high-pressure mechanical seal 6. At the same time, the air in the sealing cavity is discharged through the circulating water outlet 102. When the water pump unit is started and the high-temperature medium is pressurized and supplied by the water pump, the static ring of the high-pressure mechanical seal 6 can be rapidly cooled, and the mechanical seal will not be dry-frictioned due to high temperature. At the same time, the mechanical seal can be cooled, which greatly extends the service life of the mechanical seal. It can also cool the direct-connected shaft 4 to prevent the medium temperature from being transmitted to the motor bearings and motor supports. Finally, the circulated water can be discharged through the circulating water outlet 102. The circulating water can be recycled for a second time after cooling, without causing pollution and waste.

Claims

1. A pump body motor connection cooling circulation structure, which is arranged between a motor with a flange and a pump body without a flange, wherein the direct connection shaft of the motor is connected to the impeller in the pump body, characterized in that: The pump body is connected to the flange of the motor through a cover plate and a connecting cover in sequence; a circulating water holding chamber is formed between the connecting cover and the cover plate; a circulating water inlet and a circulating water outlet are respectively provided on two opposite sides of the circulating water holding chamber; a mechanical seal position matching the direct-connected shaft is provided at the center of the cover plate and the connecting cover; a static ring of a low-pressure mechanical seal is provided on the mechanical seal position of the connecting cover; a static ring of a high-pressure mechanical seal is provided on the mechanical seal position of the cover plate; and the dynamic rings of the low-pressure mechanical seal and the high-pressure mechanical seal are fixed on the direct-connected shaft.

2. A pump body motor connection cooling cycle structure according to claim 1, characterized in that: A sealing groove is provided at the contact edge between the connecting cover and the cover plate, and a sealing ring is provided in the sealing groove for preventing water leakage from the circulating water receiving chamber.

3. The pump body motor connection cooling cycle structure according to claim 1, characterized in that: The cover plate is provided with an exhaust hole for connecting the interior of the pump body with the outside, and an exhaust valve is provided on the surface of the cover plate and at the end of the exhaust hole.

4. The pump-motor connection cooling cycle structure according to claim 1, characterized in that: When the water pump is arranged upright and the motor is located above the water pump, the circulating water inlet is located at a lower level than the circulating water outlet, and the circulating water outlet is located at a higher level than the friction surfaces of the dynamic and static rings of the low-pressure mechanical seal.

5. The pump-motor connection cooling cycle structure according to claim 1, characterized in that: When the water pump is arranged horizontally, the circulating water inlet is located at the bottom of the connecting cover, and the circulating water outlet is located at the top of the connecting cover.

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