Centrifugal pump capable of continuously working to keep temperature of equipment

Abstract

The invention discloses a centrifugal pump capable of continuously working to keep equipment temperature, and relates to the field of centrifugal pumps, the centrifugal pump comprises a mounting base, a motor is mounted on the mounting base, the output end of the motor is connected with a shell through a coupler, a water circulation cooling pipeline is arranged between the shell and the motor, and the centrifugal pump further comprises a shell; the water inlet end and the water outlet end of the shell are provided with a water inlet pipe and a water outlet pipe respectively, the shell is coaxially provided with an annular shell on the outer wall of the water inlet pipe, the annular shell is communicated with the water inlet pipe, the annular shell is communicated with the water outlet pipe, and an electromagnetic valve is arranged between the annular shell and the water outlet pipe. When the outlet valve of the centrifugal pump is closed, water at the water outlet end of the shell enters the annular shell along the pipeline and then is sprayed to the impeller in the shell through the inclined communicating pipe, the rotating speed of the impeller is reduced, but the impeller cannot stop rotating, and the water in the shell can circularly flow to maintain constant-speed rotation of the impeller; and the electromagnetic valve is synchronously closed at the moment that the outlet valve of the centrifugal pump is opened, so that the water pressure at the outlet of the centrifugal pump can be quickly recovered.

Description

Technical Field

[0001] The invention relates to the field of centrifugal pumps, in particular to a centrifugal pump capable of continuously working and maintaining the temperature of equipment. Background Art

[0002] Centrifugal pumps are widely used in various fields such as urban water supply, petrochemical industry, shipbuilding industry, aerospace, farmland irrigation, etc.

[0003] A Chinese patent with related announcement number CN109139564A discloses a centrifugal pump insulation device, including a protective cover, which has a hollow structure inside and an open upper end, an end cover is fixed to the upper end of the protective cover, and a water tank is provided at the rear of the upper end of the end cover; an insulation structure is arranged in the hollow structure inside the protective cover, the insulation structure includes a left vertical plate and a right vertical plate that are symmetrically arranged on the left and right sides, metal sheets are connected to the sides of the left and right vertical plates that are close to each other, spiral metal pipes are passed through the metal sheets, and the water inlet pipe at the right end of the spiral metal pipe is connected to the bottom of the water tank.

[0004] In the prior art, when the outlet valve of a centrifugal pump is closed, the outlet pressure will increase accordingly. At this time, because the water flow in the pump body is obstructed, the water flow pressure continues to increase. When the outlet pressure rises to a certain level, the impeller of the pump will encounter great resistance and cannot continue to rotate, which can easily cause the pump to stop operating.

[0005] With regard to the above-mentioned related technologies, the heat exchange efficiency between the existing centrifugal pump cooling pipeline and the motor is poor. At the same time, the water after the motor is cooled will be directly discharged, which is easy to cause the head of the centrifugal pump to be reduced due to diversion at the outlet of the centrifugal pump. In addition, in the use scenario where the centrifugal pump outlet valve needs to be opened and closed intermittently, when the centrifugal pump outlet valve is closed, the impeller is easy to stop rotating due to increased resistance. After the centrifugal pump outlet valve is opened, the impeller in the centrifugal pump needs to gradually increase the speed to restore the pressure at the centrifugal pump outlet, making it difficult for the centrifugal pump to maintain a stable outlet pressure when the outlet valve is frequently opened and closed. In summary, it is not easy for the existing centrifugal pump to maintain a relatively stable pressure when the centrifugal pump outlet valve is frequently opened and closed. Summary of the invention

[0006] Based on this, the purpose of the present invention is to provide a centrifugal pump that works continuously to maintain the temperature of the equipment, so as to solve the technical problem that the existing centrifugal pump is not easy to maintain a relatively stable pressure under the condition of frequent opening and closing of the centrifugal pump outlet valve.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a centrifugal pump that works continuously to maintain the temperature of the equipment, comprising a mounting seat, a motor mounted on the mounting seat, an output end of the motor connected to a housing via a coupling, a water circulation cooling pipeline arranged between the housing and the motor, and a housing, a water inlet pipe and a water outlet pipe being arranged at the water inlet end and the water outlet end of the housing respectively, an annular shell being coaxially arranged on the outer wall of the water inlet pipe, the annular shell being connected to the water inlet pipe, the annular shell being connected to the water inlet pipe, the annular shell being connected to the drain pipe and being connected to each other and being provided with an electromagnetic valve.

[0008] By adopting the above technical solution, when the outlet valve of the centrifugal pump is closed, the solenoid valve is opened to form a pressure difference at both ends of the pipeline, so that the water at the water outlet end of the shell enters the annular shell along the pipeline, and then is sprayed to the impeller in the shell through the inclined connecting pipe, thereby reducing the speed of the impeller but not stopping the impeller, so that the water in the shell can circulate to maintain the uniform rotation of the impeller. At the moment the outlet valve of the centrifugal pump is opened, the solenoid valve is closed synchronously, so that the water pressure at the outlet of the centrifugal pump can be quickly restored.

[0009] The present invention is further configured such that a first pressure relief pipe is connected to one side of the drain pipe, a second water return pipe is connected to the annular shell, and a solenoid valve is connected between the second water return pipe and the first pressure relief pipe.

[0010] Preferably, when the outlet valve of the centrifugal pump is closed, the electromagnetic valve is opened synchronously to allow the water in the centrifugal pump to circulate, so as to avoid the impeller from stalling due to excessive resistance.

[0011] The present invention is further configured such that water cooling boxes are installed on both sides of the motor housing, the tops of the two water cooling boxes are connected by a drainage connecting pipe, and the bottoms are connected by a water inlet connecting pipe, and the annular shell and the drainage connecting pipe are connected by a first return water pipe.

[0012] Preferably, a water-cooling box is used to achieve efficient heat exchange between the cooling water circuit and the motor.

[0013] The present invention is further configured such that a plurality of groups of connecting pipes are connected between the annular shell and the water inlet pipe, and each group of connecting pipes includes a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are both inclined toward the impeller in the shell, the first connecting pipe is inclined toward the direction of forward rotation of the impeller, and the second connecting pipe is inclined toward the direction of reverse rotation of the impeller.

[0014] Preferably, the casing can also decelerate the impeller during the water circulation process to avoid a continuous increase in the pressure in the casing due to an excessively fast impeller rotation speed.

[0015] The present invention is further configured such that a first valve core is disposed in the first connecting pipe, a second valve core is disposed in the second connecting pipe, and an increase in pressure in the annular shell can close the first valve core and open the second valve core.

[0016] Preferably, the kinetic energy of the return water is effectively utilized when there is no need to decelerate the impeller, and when it is necessary to decelerate the impeller, the interference of the reverse return water on the water flow that reduces the impeller speed can be avoided.

[0017] The present invention is further configured such that a magnetic coupling coupling is provided between the motor and the rotating shaft of the impeller in the casing.

[0018] Preferably, damage to the motor is avoided during the process of reducing the impeller rotation speed.

[0019] The present invention is further configured such that the drainage pipe and the water inlet connecting pipe are connected via a second pressure relief pipe.

[0020] Preferably, the water in the drainage pipe is discharged into the water inlet connecting pipe through the second pressure relief pipe.

[0021] The present invention is further configured such that both the first water return pipe and the second water return pipe are connected to the annular shell in a direction tangent to the annular shell, and the water flows entering the annular shell all flow in the forward direction.

[0022] Preferably, the relative flow of water in the first water return pipe and the second water return pipe is prevented to cause kinetic energy loss, and the water flow can also be made to pass through the multiple connecting pipe structures between the annular shell and the water inlet pipe evenly.

[0023] In summary, the present invention mainly has the following beneficial effects:

[0024] 1. The present invention connects an annular shell to the water inlet end of the centrifugal pump housing, uses a connecting pipe between the annular shell and the housing to communicate with each other, and connects a pipeline with a solenoid valve between the water outlet end of the housing and the annular shell. When the outlet valve of the centrifugal pump is closed, the solenoid valve is opened to form a pressure difference at both ends of the pipeline, so that water at the water outlet end of the housing enters the annular shell along the pipeline, and then is sprayed to the impeller in the housing through the inclined connecting pipe, reducing the rotation speed of the impeller but not stopping the impeller, so that the water in the housing can circulate to maintain the uniform rotation of the impeller. At the moment when the outlet valve of the centrifugal pump is opened, the solenoid valve is closed synchronously, so that the water pressure at the outlet of the centrifugal pump can be quickly restored.

[0025] 2. The present invention connects the water inlet pipe of the water cooling box at the outlet end of the shell to connect the water outlet pipe of the water cooling box to the annular shell. The annular shell uses the connecting pipe to discharge the circulated water back into the shell, and the water discharged back into the shell flows in the direction of rotation of the impeller. While achieving the cooling of the motor, the head reduction phenomenon caused by the outlet diversion of the centrifugal pump is effectively reduced;

[0026] 3. The present invention connects multiple groups of connecting pipes toward the housing in the annular shell, and each group of connecting pipes includes two connecting pipes with opposite inclination directions. Before the solenoid valve is opened, the connecting pipe with the water outlet direction in the same direction as the impeller rotation direction is opened. On the contrary, when the solenoid valve is opened, the connecting pipe with the water outlet direction in the opposite direction to the impeller rotation direction is opened, thereby effectively reducing the influence of the centrifugal pump outlet diversion on the head, and effectively reducing the speed of the impeller after the centrifugal pump outlet valve is closed, and maintaining the water circulation in the housing to prevent the impeller from stopping.

[0027] 4. The present invention sets a water-cooling box body in close contact with the heat dissipation fins of the motor, and respectively sets a water outlet channel and a water inlet channel at the top and bottom of the water-cooling box body. The motor is cooled by the water circulating through the water-cooling box body. The water flowing out of the water-cooling box body enters the annular shell and then enters the shell along the direction of rotation of the impeller, thereby effectively reducing the influence of the cooling water circulation on the head of the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A perspective view of the present invention;

[0029] Figure 2 Another perspective view of the present invention;

[0030] Figure 3 It is a three-dimensional diagram of the cross-section state of the annular shell of the present invention;

[0031] Figure 4 It is a three-dimensional diagram of the water-cooling box of the present invention;

[0032] Figure 5 This is a three-dimensional view of the water-cooling box body of the present invention from another perspective;

[0033] Figure 6 A three-dimensional diagram of the internal structure of the annular shell of the present invention;

[0034] Figure 7 This is a schematic diagram of the internal structure of the first connecting pipe of the present invention;

[0035] Figure 8 It is a three-dimensional diagram of the internal structure of the second connecting pipe of the present invention.

[0036] Description of reference numerals:

[0037] 1. Mounting seat; 2. Motor; 3. Shell; 301. Water inlet pipe; 302. Drain pipe; 303. First pressure relief pipe; 304. Second pressure relief pipe; 4. Annular shell; 401. First return water pipe; 402. Second return water pipe; 403. First connecting pipe; 4031. First valve core; 404. Second connecting pipe; 4041. Second valve core; 5. Water-cooled box; 501. Water inlet connecting pipe; 502. Drain connecting pipe; 6. Solenoid valve. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] The following describes an embodiment of the present invention based on its overall structure.

[0040] First embodiment:

[0041] A centrifugal pump that works continuously to maintain the temperature of the equipment, see Figure 1-8 , including a mounting base 1, on which a motor 2 is mounted, and an output end of the motor 2 is connected to a housing 3 through a coupling. Specifically, a magnetic coupling coupling is arranged between the motor 2 and the rotating shaft of the impeller in the housing 3, and the magnetic coupling coupling is also mounted on the mounting base 1. The mounting base 1 is also provided with a protective cover at the mounting position of the magnetic coupling coupling. When the magnetic coupling coupling is installed, the motor 2 can maintain constant power operation without adjusting its own speed as the valve is opened or closed, thereby avoiding damage to the motor 2 in the process of reducing the impeller speed. A water circulation cooling pipeline is arranged between the housing 3 and the motor 2, and the water flowing through the housing 3 is circulated through the water circulation pipeline to cool the motor 2, thereby avoiding heat accumulation and damage to the motor 2 during long-term operation.

[0042] It also includes a shell 3, and the specific shape of the shell 3 adopts a mature centrifugal pump shell structure in the prior art. The present application does not make any improvements to the centrifugal pump shell itself in the prior art, and no further details are given here. The water inlet end and the water outlet end of the shell 3 are respectively provided with a water inlet pipe 301 and a drain pipe 302, and the shell 3 is coaxially provided with an annular shell 4 on the outer wall of the water inlet pipe 301. Specifically, the annular shell 4 and the shell 3 do not contact each other, and the inner diameter is larger than the outer diameter of the water inlet pipe 301, and the annular shell 4 is connected to the water inlet pipe 301. Specifically, the annular shell 4 and the water inlet pipe 301 are connected through a first connecting pipe 403 and a second connecting pipe 404, and the annular shell 4 and the drain pipe 302 are connected to each other and are provided with an electromagnetic valve 6, and the electromagnetic valve 6 is used to control the on and off of the water flow in the connecting pipeline.

[0043] In the above embodiments, please refer to Figure 1-3 , Figure 6-8A first pressure relief pipe 303 is connected to one side of the drain pipe 302, a second water return pipe 402 is connected to the annular shell 4, and an electromagnetic valve 6 is connected between the second water return pipe 402 and the first pressure relief pipe 303. When the outlet valve of the centrifugal pump is closed, the electromagnetic valve 6 is opened synchronously to allow the water in the centrifugal pump to circulate, so as to avoid the impeller from stalling due to excessive resistance. Conversely, after the outlet valve of the centrifugal pump is opened, the electromagnetic valve 6 is closed synchronously, and the opening and closing state of the electromagnetic valve 6 is different from the opening and closing state of the valve at the outlet of the centrifugal pump.

[0044] Water cooling boxes 5 are installed on both sides of the motor 2 casing. The tops of the two water cooling boxes 5 are connected by a drainage connecting pipe 502, and the bottoms are connected by a water inlet connecting pipe 501. The drainage connecting pipe 502 and the water inlet connecting pipe 501 are parallel to each other. The annular shell 4 and the drainage connecting pipe 502 are connected by a first return water pipe 401. The water cooling boxes 5 are used to achieve efficient heat exchange between the cooling water circuit and the motor 2.

[0045] Specifically, the water-cooling box body 5 is provided with a groove space toward the direction of the motor 2 to match the heat dissipation fins on the outer wall of the motor 2. The water-cooling box body 5 is fixed to the outer wall of the motor 2 by the friction between the groove space and the fins of the motor 2. A winding serpentine pipeline is provided inside the water-cooling box body 5. The two ends of the serpentine pipeline are respectively connected to the water inlet connecting pipe 501 and the drainage connecting pipe 502. The other spaces inside the water-cooling box body 5 are filled with a heat-conducting medium with high thermal conductivity. In this embodiment, thermal grease can be used to fill the internal space of the water-cooling box body 5 and the contact surface between the water-cooling box body 5 and the fins of the motor 2.

[0046] In the above embodiments, please refer to Figure 1-3 , Figure 6 A plurality of connecting pipes are connected between the annular shell 4 and the water inlet pipe 301, and each connecting pipe comprises a first connecting pipe 403 and a second connecting pipe 404. Specifically, in the present embodiment, a total of four connecting pipes are provided, and each connecting pipe is arranged at ninety-degree intervals on the annular surface. The first connecting pipe 403 and the second connecting pipe 404 are both inclined toward the impeller in the shell 3, and the water flowing out of the first connecting pipe 403 and the second connecting pipe 404 can affect the rotation of the impeller.

[0047] Furthermore, the first connecting pipe 403 is inclined toward the direction of the forward rotation of the impeller, and the water flow out of the first connecting pipe 403 can assist the rotation of the impeller. The second connecting pipe 404 is inclined toward the direction of the reverse rotation of the impeller, and the water flow out of the second connecting pipe 404 can generate resistance to the rotation of the impeller. The shell 3 can also slow down the impeller during the water circulation process to avoid continuous increase in pressure in the shell 3 due to excessive impeller rotation speed.

[0048] See also Figure 7-8A first valve core 4031 is provided in the first connecting pipe 403, and a second valve core 4041 is provided in the second connecting pipe 404. The pressure increase in the annular shell 4 can close the first valve core 4031 and open the second valve core 4041. When there is no need to slow down the impeller, the kinetic energy of the return water is effectively utilized, and when it is necessary to slow down the impeller, the interference of reverse return water on the water flow that reduces the impeller speed can be avoided.

[0049] Specifically, a one-way valve with a flow direction toward the annular shell 4 is arranged inside the first connecting pipe 403, and the one-way valve inside the first connecting pipe 403 is in an open state under normal circumstances. When the water pressure in the annular shell 4 increases, the spring corresponding to the first valve core 4031 in the first connecting pipe 403 is compressed, and the first valve core 4031 can be closed. A one-way valve with a flow direction toward the inside of the shell 3 is arranged inside the second connecting pipe 404, and the one-way valve inside the second connecting pipe 404 is in a closed state under normal circumstances. When the water pressure in the annular shell 4 increases, the spring corresponding to the second valve core 4041 in the second connecting pipe 404 is compressed, and the second valve core 4041 can be opened. Specifically, the spring elastic coefficient corresponding to the first valve core 4031 is smaller than the spring elastic coefficient corresponding to the second valve core 4041.

[0050] In the above embodiments, please refer to Figure 1-3 The drain pipe 302 is connected to the water inlet connecting pipe 501 through the second pressure relief pipe 304. The water in the drain pipe 302 is discharged into the water inlet connecting pipe 501 through the second pressure relief pipe 304. The water entering the water inlet connecting pipe 501 then flows into the two water-cooling boxes 5 respectively.

[0051] Second embodiment:

[0052] A centrifugal pump that works continuously to maintain the temperature of the equipment, see Figure 1-8 On the basis of the first embodiment, the difference from the first embodiment is that the first water return pipe 401 and the second water return pipe 402 are both connected to the annular shell 4 in a direction tangent to the annular shell 4, and the water flowing into the annular shell 4 flows in the forward direction, preventing the water in the first water return pipe 401 and the second water return pipe 402 from flowing relative to each other and generating kinetic energy loss, and at the same time, it can also enable the water flow to pass evenly through the multiple connecting pipe structures between the annular shell 4 and the water inlet pipe 301.

[0053] Furthermore, the parts of the first water return pipe 401 and the second water return pipe 402 connected to the annular shell 4 are parallel to each other. The water flowing into the annular shell 4 from the first water return pipe 401 and the second water return pipe 402 will flow along the annular inner wall of the annular shell 4 and enter the shell 3 evenly through each connecting pipe, thereby avoiding the situation where the impeller shakes due to uneven water pressure entering the shell.

[0054] The centrifugal pump of the present invention is as follows during specific operation:

[0055] When the outlet valve of the centrifugal pump is not closed, the solenoid valve 6 is closed, and the centrifugal pump pumps water normally. Since the water pressure at the drain pipe 302 is higher than the water pressure at the water inlet pipe 301, the second pressure relief pipe 304 diverts a portion of the water flow into the water inlet connecting pipe 501. The water flow in the water inlet connecting pipe 501 enters the two water cooling boxes 5 respectively and absorbs the heat generated by the motor 2, and then flows out from the water outlet of the water cooling box 5 to the drain connecting pipe 502.

[0056] The water in the drainage connecting pipe 502 enters the annular shell 4 after passing through the first water return pipe 401. Since the water pressure of the diverted water from the second pressure relief pipe 304 is not high, the pressure of the diverted water returning to the annular shell 4 after circulating through the water cooling box 5 is not enough to open the second valve core 4041, and is also not enough to close the first valve core 4031. At this time, the return water flowing into the annular shell 4 from the first water return pipe 401 passes through the first connecting pipe 403 and enters the shell 3. Since the first connecting pipe 403 is inclined toward the impeller in the shell 3 and is in the same direction as the rotation direction of the impeller, the water flow is not likely to have a negative impact on the rotation of the impeller during the process of entering the shell 3.

[0057] When the outlet valve of the centrifugal pump is closed, the solenoid valve 6 is opened synchronously, and the water pressure at the drain pipe 302 gradually increases. While diverting to the second pressure relief pipe 304, it also diverts to the first pressure relief pipe 303. The water entering the first pressure relief pipe 303 passes through the solenoid valve and then enters the annular shell 4 through the second return pipe 402. The water flowing into the first return pipe 401 and the water flowing into the second return pipe 402 in the annular shell 4 flow in the annular shell 4 in an annular direction. At this time, the water pressure in the annular shell 4 is sufficient to make the first valve core 40 31 is closed, and the second valve core 4041 is opened at the same time. The water flow entering the annular shell 4 passes through the second connecting pipe 404 and then enters the shell 3. Since the second connecting pipe 404 is inclined toward the impeller in the shell 3 and is in the opposite direction of the rotation direction of the impeller, the water flow at this time has an impedance effect on the normal rotation of the impeller, which can effectively reduce the speed of the impeller and avoid the continuous increase of the water pressure at the outlet of the centrifugal pump. After reducing the speed of the impeller, the water flow in the shell 3 of the centrifugal pump circulates to maintain a stable water pressure;

[0058] After the outlet valve of the centrifugal pump is opened again, the solenoid valve 6 is closed synchronously, and the water pressure at the outlet of the centrifugal pump can be quickly restored to normal pumping water.

[0059] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A centrifugal pump that works continuously to maintain the temperature of the equipment, characterized in that: include: A mounting seat (1), a motor (2) being mounted on the mounting seat (1), an output end of the motor (2) being connected to a housing (3) via a coupling, and a water circulation cooling pipeline being provided between the housing (3) and the motor (2); A shell (3), wherein the water inlet end and the water outlet end of the shell (3) are respectively provided with a water inlet pipe (301) and a water discharge pipe (302); the shell (3) is provided with an annular shell (4) coaxially on the outer wall of the water inlet pipe (301); the annular shell (4) and the water inlet pipe (301) are interconnected; the annular shell (4) and the water discharge pipe (302) are interconnected and a solenoid valve (6) is provided.

2. The centrifugal pump for continuously operating and maintaining equipment temperature according to claim 1, characterized in that: One side of the drainage pipe (302) is connected to a first pressure relief pipe (303), the annular shell (4) is connected to a second water return pipe (402), and a solenoid valve (6) is connected between the second water return pipe (402) and the first pressure relief pipe (303).

3. The centrifugal pump for continuously operating and maintaining equipment temperature according to claim 2, characterized in that: Water cooling boxes (5) are installed on both sides of the motor (2) housing. The tops of the two water cooling boxes (5) are connected via a drainage connecting pipe (502), and the bottoms are connected via a water inlet connecting pipe (501). The annular shell (4) and the drainage connecting pipe (502) are connected via a first return water pipe (401).

4. The centrifugal pump for continuously operating and maintaining equipment temperature according to claim 1, characterized in that: A plurality of connecting tubes are connected between the annular shell (4) and the water inlet pipe (301), and each connecting tube comprises a first connecting tube (403) and a second connecting tube (404). The first connecting tube (403) and the second connecting tube (404) are both arranged to be inclined toward the impeller in the shell (3). The first connecting tube (403) is inclined toward the direction of forward rotation of the impeller, and the second connecting tube (404) is inclined toward the direction of reverse rotation of the impeller.

5. The centrifugal pump for continuously operating and maintaining equipment temperature according to claim 4, characterized in that: A first valve core (4031) is disposed in the first connecting tube (403), and a second valve core (4041) is disposed in the second connecting tube (404). When the pressure in the annular shell (4) increases, the first valve core (4031) can be closed and the second valve core (4041) can be opened.

6. The centrifugal pump for continuously operating and maintaining equipment temperature according to claim 1, characterized in that: A magnetic coupling coupling is provided between the motor (2) and the rotating shaft of the impeller in the casing (3).

7. The centrifugal pump for continuously operating and maintaining equipment temperature according to claim 3, characterized in that: The drainage pipe (302) and the water inlet connecting pipe (501) are connected via a second pressure relief pipe (304).

8. The centrifugal pump for continuously operating and maintaining equipment temperature according to claim 3, characterized in that: The first water return pipe (401) and the second water return pipe (402) are both connected to the annular shell (4) in a direction tangent to the annular shell (4), and the water flows entering the annular shell (4) in a forward direction.

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