Cooling water pump with noise reduction structure

Abstract

The invention relates to the technical field of cooling water pumps, in particular to a cooling water pump with a noise reduction structure. Comprising a shell which is communicated with a suction pipe and a discharge pipe; the mounting seat is fixedly connected to the shell, the mounting seat is rotationally connected with a rotating shaft, the rotating shaft is provided with a buffer part, the rotating shaft is in spline connection with a rear cover plate, the rear cover plate is fixedly connected with a first blade and a second blade, and the first blade is fixedly connected with a front cover plate; and the sliding frame is connected into the buffering part in a sliding mode, the sliding frame is fixedly connected with a plugging block, and the rear cover plate is provided with a hole. Liquid is guided through the holes in the surface of the rear cover plate, so that the liquid impact force borne by the surface of the rear cover plate is reduced, the probability that the liquid impacts the surface of the rear cover plate after the power of a cooling system is increased and forms a turbulent flow phenomenon is reduced, turbulent flow noise is reduced, and the influence of turbulent flow on the surface strength of the rear cover plate is reduced; therefore, the damage probability of the rear cover plate is reduced, and the service life of the rear cover plate is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of cooling water pumps, and in particular to a cooling water pump with a noise reduction structure. Background Art

[0002] The main function of the cooling water pump is to absorb heat through the circulating cooling medium (such as water, ethylene glycol solution, etc.) to keep the equipment that needs to be cooled within a suitable operating temperature range. The existing cooling water pump is connected to the cooling system, and generally includes a housing, a mounting seat, a motor, an impeller, an inlet pipe and an outlet pipe. The liquid flows to the center of the impeller through the inlet pipe, and then the impeller uses centrifugal force to throw the liquid out to the outlet pipe. However, the existing motor shaft is splined at the axis of the impeller. During the use of the cooling water pump, the cooling medium will continuously impact the connection between the impeller and the motor shaft. Once the power of the cooling system increases, the liquid impact force on the connection between the impeller and the motor shaft will also increase synchronously, which will cause turbulence at the connection between the impeller and the motor shaft due to the excessively fast liquid flow rate. In the long run, not only will there be turbulent noise at the impeller and the motor shaft, which will affect the external environment, but the strength of the connection between the impeller and the motor shaft will also be loosened or even damaged due to the impact of the liquid, thereby affecting the service life of the cooling water pump. Summary of the invention

[0003] In order to overcome the disadvantages mentioned in the above background, the present invention provides a cooling water pump with a noise reduction structure.

[0004] The technical solution of the present invention is: a cooling water pump with a noise reduction structure, comprising:

[0005] A shell, wherein the shell is connected with a suction pipe and a discharge pipe;

[0006] A mounting seat is fixedly connected to the shell, the mounting seat is rotatably connected with a rotating shaft that penetrates into the shell, the rotating shaft is driven by an output shaft of an external motor through an external coupling, the rotating shaft is provided with a buffer portion, the rotating shaft is spline-connected with a rear cover plate, the two sides of the rear cover plate are respectively fixedly connected with circumferentially distributed first blades and circumferentially distributed second blades, and the side of all the first blades away from the rear cover plate is commonly fixedly connected with a front cover plate;

[0007] A sliding frame is slidably connected in the buffer portion, a first elastic member is fixedly connected between the sliding frame and the buffer portion, the sliding frame is fixedly connected with circumferentially distributed blocking blocks whose number is the same as the number of the first blades, all the first blades and all the blocking blocks are alternately distributed, the rear cover plate is provided with holes whose number is the same as the blocking blocks, and the blocking blocks are used to block adjacent holes on the rear cover plate.

[0008] Preferably, the buffer portion is rotatably connected to the shell, the buffer portion and the shell are sealed by a sealing gasket, and the diameter of the buffer portion is greater than the diameter of the rotating shaft.

[0009] Preferably, all holes on the rear cover plate are located close to its axis, so as to release the liquid pressure close to the center of the rear cover plate.

[0010] As a preferred embodiment, it also includes:

[0011] A guide block is slidably connected to the rotating shaft near the suction pipe, and the maximum diameter of the guide block is greater than the diameter of the connection between the rotating shaft and the rear cover plate.

[0012] Preferably, the diameter of the guide block gradually increases from close to the suction pipe to far away from it.

[0013] As a preferred embodiment, it also includes:

[0014] A sealing member is fixedly connected to the guide block. The sealing member is made of elastic material. A side of the sealing member away from the guide block is closely attached to a position of the rotating shaft close to the rear cover plate.

[0015] As a preferred embodiment, it also includes:

[0016] A pressure sensor is installed on the rotating shaft and is located inside the sealing member, and a second elastic member is fixedly connected between the guide block and the pressure sensor;

[0017] A regulating valve is installed on the discharge pipe and is used to adjust the flow of the discharge pipe.

[0018] As a preferred embodiment, it also includes:

[0019] A sealing ring is fixedly connected to the sliding frame, a gap exists between the sealing ring and the buffer part, and the sealing ring is made of a flexible material and is used to seal the connection between the buffer part and the shell.

[0020] As a preferred embodiment, it also includes:

[0021] The sealing airbag is fixedly connected to the buffer part. The diameter of the sealing airbag gradually increases from the position close to the rear cover plate to the position far away from the rear cover plate. The sealing airbag is rotatably connected to the shell. A connecting part is arranged on one side of the mounting seat close to the shell.

[0022] Preferably, a chamber is provided in the buffer portion, a first elastic member between the sliding frame and the buffer portion is located in the chamber, the sliding frame slides in the chamber of the buffer portion, and the chamber of the buffer portion is communicated with the sealing airbag.

[0023] Compared with the prior art, the present invention has the following advantages: 1. The present invention guides the liquid through the holes on the surface of the rear cover plate, thereby reducing the impact force of the liquid on the surface of the rear cover plate, reducing the probability of the liquid impacting the surface of the rear cover plate and forming turbulence after the power of the cooling system is increased, reducing the generation of turbulence noise, and reducing the impact of turbulence on the surface strength of the rear cover plate, thereby reducing the probability of damage to the rear cover plate and increasing the service life of the rear cover plate;

[0024] 2. The guide block blocks and guides the liquid so that the liquid no longer directly impacts the connection between the shaft and the rear cover, thereby reducing the force of the liquid directly impacting the connection between the shaft and the rear cover, reducing the probability of damage to the shaft and the rear cover, and thus extending the life of the shaft and the rear cover;

[0025] 3. The connection between the buffer part and the shell is adaptively sealed by a sealing airbag. The greater the liquid pressure on the sliding frame, the greater the expansion volume of the sealing airbag, so as to prevent the sealing failure of the connection between the buffer part and the shell due to the increase of the power of the cooling system, thereby causing liquid to seep out between the buffer part and the shell, thereby affecting the working efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a three-dimensional structural cross-sectional view of the housing and the mounting seat of the present invention;

[0028] Figure 3 It is a schematic diagram of the three-dimensional structure of the first blade and the second blade of the present invention;

[0029] Figure 4 It is a schematic diagram of the three-dimensional structure of the rear cover plate of the present invention;

[0030] Figure 5 It is a three-dimensional structural schematic diagram of the sliding frame and the blocking block of the present invention;

[0031] Figure 6 It is a schematic diagram of the three-dimensional structure of the connecting part of the present invention.

[0032] Marked in the figure: 1-shell, 101-intake pipe, 102-discharge pipe, 2-mounting seat, 201-rotating shaft, 2011-buffer part, 202-rear cover, 2021-first blade, 2022-second blade, 203-front cover, 3-sliding frame, 301-sealing block, 4-guide block, 5-seal, 6-pressure sensor, 7-regulating valve, 8-sealing ring, 9-sealing airbag, 10-connecting part. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0034] A cooling water pump with a noise reduction structure, such as Figure 1-Figure 5 As shown, it includes: a shell 1, the shell 1 is connected with a suction pipe 101 and a discharge pipe 102; a mounting seat 2, fixedly connected to the shell 1, the mounting seat 2 is rotatably connected with a rotating shaft 201 that penetrates into the shell 1, the rotating shaft 201 is driven by an external coupling and an output shaft of an external motor, the rotating shaft 201 is provided with a buffer portion 2011, the rotating shaft 201 is spline-connected with a rear cover plate 202, the two sides of the rear cover plate 202 are respectively fixed with circumferentially distributed first blades 2021 and circumferentially distributed second blades 2022, and the left sides of all the first blades 2021 are commonly fixed with a front cover plate 203; a sliding frame 3, slidably connected to the buffer portion 2011, a first elastic member is fixed between the sliding frame 3 and the buffer portion 2011, the sliding frame 3 is fixed with circumferentially distributed blocking blocks 301 and the same number as the first blades 2021, all the first blades 2021 and all the blocking blocks 301 are alternately spaced, and the rear cover The plate 202 is provided with the same number of holes as the blocking block 301. The blocking block 301 is used to block adjacent holes on the rear cover plate 202. The buffer part 2011 is rotatably connected to the shell 1. The buffer part 2011 and the shell 1 are sealed by a sealing gasket. The diameter of the buffer part 2011 is larger than the diameter of the rotating shaft 201. The original connection between the rotating shaft 201 and the shell 1 is changed to the connection between the buffer part 2011 and the shell 1, so that the connection is far away from the axis of the rear cover plate 202. The farther the position in the shell 1 is from the axis of the rear cover plate 202, the smaller the liquid pressure therein is, thereby reducing the liquid pressure at the connection between the buffer part 2011 and the shell 1, so as to reduce the probability of damage to the connection between the buffer part 2011 and the shell 1 and increase the service life of the device. All holes on the rear cover plate 202 are located near its axis, which is used to release the liquid pressure near the center of the circle of the rear cover plate 202.

[0035] Furthermore, a control terminal not shown in the figure is disposed outside the housing 1, and the external motor is electrically connected to the control terminal.

[0036] Furthermore, the distance between two adjacent first blades 2021 and the distance between two adjacent second blades 2022 gradually increase from the axis center to the edge of the rear cover plate 202, so that the liquid pressure at the axis center of the rear cover plate 202 is greater than the liquid pressure at the edge of the rear cover plate 202, thereby accelerating the speed at which the liquid flows from the axis center to the edge of the rear cover plate 202 and improving the working efficiency of the device.

[0037] Furthermore, the first elastic member between the sliding frame 3 and the buffer portion 2011 is a compression spring.

[0038] The specific working principle is as follows:

[0039] Before using the device, the mounting base 2 is installed on the right side of the housing 1 .

[0040] When the operator needs to use the device to circulate the cooling medium (hereinafter referred to as liquid) in the cooling system, the device is connected to the cooling system. During the use of the device, the operator turns on the external motor through the control terminal, and the output shaft of the external motor drives the rotating shaft 201 to rotate through the external coupling, and the rotating shaft 201 drives the rear cover plate 202 to rotate, and the rear cover plate 202 drives all the first blades 2021 and all the second blades 2022 to rotate. The liquid is affected by the rotation of the rear cover plate 202 and is sucked into the shell 1 from the suction pipe 101. The liquid flows through the front cover plate 203, the middle part of the rear cover plate 202 and all the first blades 2021 in turn. At the same time, the liquid flows to the surroundings of the shell 1 under the action of the centrifugal force of the rotation of all the first blades 2021, and then the liquid flows back to the cooling system through the discharge pipe 102.

[0041] When the liquid impacts the surface of the rear cover plate 202, if the power of the cooling system increases, resulting in an increase in the pressure of the liquid impacting the surface of the rear cover plate 202, all the blocking blocks 301 are compressed and jointly drive the sliding frame 3 to move rightward, so that the first elastic member between the sliding frame 3 and the buffer portion 2011 contracts, and the holes on the surface of the rear cover plate 202 lose the blocking of the blocking blocks 301, and a part of the liquid flows through the holes of the rear cover plate 202 to the second blades 2022 (the rear cover plate 202 drives all the second blades 2022 to rotate, and flows to the second blades 2 The liquid at 022 is affected by the centrifugal force of the rotation of all the second blades 2022 and flows around the shell 1, and then the liquid flows back to the cooling system through the discharge pipe 102), thereby reducing the impact force of the liquid on the surface of the rear cover plate 202, reducing the probability of the liquid impacting the surface of the rear cover plate 202 and forming turbulence after the power of the cooling system is increased, reducing the generation of turbulent noise, and reducing the impact of turbulence on the surface strength of the rear cover plate 202, thereby reducing the probability of damage to the rear cover plate 202 and increasing the service life of the rear cover plate 202.

[0042] When the speed of the output shaft on the external motor decreases, the speed of the rotating shaft 201 decreases, and the power of the cooling system decreases, the liquid pressure on the blocking block 301 decreases, and the first elastic member between the sliding frame 3 and the buffer part 2011 gradually rebounds, causing the blocking block 301 to gradually move and reset until the holes on the surface of the rear cover plate 202 are blocked again. When it is necessary to stop using the device, the operator turns off the external motor and the cooling system through the control terminal so that the liquid no longer flows into the shell 1.

[0043] like Figure 2 , Figure 3 and Figure 5As shown, it also includes: a guide block 4, which is slidably connected to the rotating shaft 201 near the suction pipe 101, and the maximum diameter of the guide block 4 is larger than the diameter of the connection between the rotating shaft 201 and the rear cover plate 202, and the diameter of the guide block 4 gradually increases from close to the suction pipe 101 to far away.

[0044] like Figure 3 and Figure 5 As shown, it also includes: a sealing member 5 fixed to the guide block 4, the sealing member 5 is made of elastic material, and the right side of the sealing member 5 is close to the position of the rotating shaft 201 close to the rear cover plate 202.

[0045] Furthermore, when the liquid enters the shell 1 from the suction pipe 101, the liquid is blocked by the guide block 4 and diffuses around along its surface, so that the liquid no longer directly impacts the connection between the rotating shaft 201 and the rear cover plate 202, thereby reducing the force of the liquid directly impacting the connection between the rotating shaft 201 and the rear cover plate 202, reducing the probability of damage to the rotating shaft 201 and the rear cover plate 202, thereby extending the life of the rotating shaft 201 and the rear cover plate 202.

[0046] Furthermore, since the diameter of the guide block 4 gradually increases from close to the suction pipe 101 to far away from it, when the guide block 4 moves to the right and squeezes the seal 5 to deform, the flow area between the guide block 4 and the suction pipe 101 gradually increases. Conversely, when the guide block 4 moves to the left and resets, the flow area between the guide block 4 and the suction pipe 101 gradually decreases.

[0047] like Figure 1 , Figure 2 and Figure 5 As shown, it also includes: a pressure sensor 6 installed on the rotating shaft 201 and located in the sealing member 5, and a second elastic member is fixedly connected between the guide block 4 and the pressure sensor 6; a regulating valve 7 installed on the discharge pipe 102, for adjusting the flow of the discharge pipe 102.

[0048] Furthermore, the pressure sensor 6 is electrically connected to the control terminal, and the regulating valve 7 is electrically connected to the control terminal. If the pressure applied to the pressure sensor 6 changes, the pressure sensor 6 controls the regulating valve 7 to open through the control terminal, and adjusts the liquid flow rate of the regulating valve 7. When the pressure applied to the pressure sensor 6 increases, the liquid flow rate of the regulating valve 7 increases synchronously. When the pressure applied to the pressure sensor 6 decreases, the liquid flow rate of the regulating valve 7 decreases synchronously.

[0049] Furthermore, the second elastic member between the guide block 4 and the pressure sensor 6 is a compression spring.

[0050] The specific working principle is as follows:

[0051] When the liquid enters the shell 1 from the suction pipe 101, the operator opens the regulating valve 7 through the control terminal, and the guide block 4 protects the rotating shaft 201 and the rear cover plate 202, so that the liquid no longer directly impacts the connection between the rotating shaft 201 and the rear cover plate 202, and the greater the liquid pressure on the guide block 4, the greater the distance the guide block 4 is compressed and moves to the right, and the seal 5 is deformed under pressure and accumulates at the connection between the rotating shaft 201 and the rear cover plate 202, thereby enhancing the sealing effect of the seal 5 between the rotating shaft 201 and the rear cover plate 202 to prevent the liquid from flowing into the space between the rotating shaft 201 and the rear cover plate 202, causing the connection between the rotating shaft 201 and the rear cover plate 202 to loosen or even break, thereby affecting the normal use of the device.

[0052] When the operator needs to increase the power of the cooling system, the operator controls the output shaft of the external motor to speed up through the control terminal, so that the rotation speeds of the shaft 201, the rear cover plate 202 and all the first blades 2021 are all accelerated, and the liquid is sucked into the shell 1 from the suction pipe 101 due to the rotation of the rear cover plate 202. The liquid flow entering the suction pipe 101 increases, and the guide block 4 is compressed and moves to the right (the guide block 4 moves to the right, so that the flow area between the suction pipe 101 and the guide block 4 increases), and the guide block 4 squeezes its second elastic member, and the second The elastic member squeezes the pressure sensor 6, so that the pressure on the pressure sensor 6 increases. The pressure sensor 6 controls the flow rate of the regulating valve 7 through the control terminal, so that the liquid flow rate of the regulating valve 7 increases synchronously, and the liquid flow rate of the discharge pipe 102 increases synchronously, so that the liquid flow rates in the discharge pipe 102 and the suction pipe 101 change synchronously, thereby preventing the discharge pipe 102 and the suction pipe 101 from having a difference in liquid flow, and avoiding excessive liquid entering the suction pipe 101, resulting in excessive pressure in the shell 1, and even causing the structural seal in the shell 1 to fail.

[0053] When the operator needs to reduce the power of the cooling system, the operator controls the speed of the output shaft on the external motor to slow down through the control terminal, so that the speeds of the rotating shaft 201, the rear cover plate 202 and all the first blades 2021 are all slowed down, the liquid flow entering the suction pipe 101 is reduced, the pressure on the guide block 4 is reduced, the seal 5 gradually rebounds, the second elastic member of the guide block 4 rebounds and drives it to move to the left, the pressure on the pressure sensor 6 is reduced, and the liquid flow rate of the regulating valve 7 is reduced, so that the liquid flow rates in the discharge pipe 102 and the suction pipe 101 change synchronously, thereby preventing the discharge pipe 102 and the suction pipe 101 from having a difference in liquid flow, and avoiding the flow area at the discharge pipe 102 and the suction pipe 101 being greater than the liquid flow, resulting in gas in the shell 1 and even cavitation, which affects the service life of the device. When it is necessary to stop using the device, the operator turns off the pressure sensor 6, the regulating valve 7 and the cooling system through the control terminal, and the liquid no longer flows into the shell 1, so that the second elastic member of the guide block 4, the guide block 4 and the seal 5 are all moved and reset.

[0054] like Figure 3 and Figure 4 As shown, it also includes: a sealing ring 8, which is fixed to the sliding frame 3, and there is a gap between the sealing ring 8 and the buffer part 2011. The sealing ring 8 is made of flexible material and is used to seal the connection between the buffer part 2011 and the shell 1.

[0055] Furthermore, when the liquid pressure is too high, the sliding frame 3 drives the sealing ring 8 to move until it contacts and gradually squeezes the buffer part 2011. The greater the liquid pressure, the greater the distance the sliding frame 3 moves, and the sealing ring 8 is compressed and deformed, thereby strengthening the sealing effect of the connection between the buffer part 2011 and the shell 1, preventing the liquid pressure from being too high and impacting the connection between the buffer part 2011 and the shell 1, resulting in failure of the seal between the buffer part 2011 and the shell 1.

[0056] like Figure 4-Figure 6 As shown, it also includes: a sealing airbag 9, which is fixed to the buffer part 2011. The outer diameter of the sealing airbag 9 gradually increases from the position close to the rear cover plate 202 to the position away from it, so as to facilitate the sealing airbag 9 to be inserted into the shell body 1. The sealing airbag 9 is rotatably connected to the shell body 1. Since the shell body 1 and the mounting seat 2 need to be sealed by inserting a sealing gasket, a gap and an annular groove for storing the sealing airbag 9 are required between the shell body 1 and the mounting seat 2. In this embodiment, the sealing airbag 9 replaces the sealing gasket between the shell body 1 and the mounting seat 2 in the above embodiment. A connecting port is provided on one side of the shell body 1 close to the mounting seat 2 for inserting the buffer part 2011 and the connecting part 10. The radius of the connecting port on the far right side of the shell body 1 for inserting the buffer part 2011 and the connecting part 10 is X, and the buffer part The radius of 2011 is Y, X>Y, a connecting part 10 is provided on the left side of the mounting seat 2, and the thickness of the connecting part 10 is XY. The connecting part 10 is used to fill the gap between the shell 1 and the buffer part 2011. A chamber is provided in the buffer part 2011, and the chamber of the buffer part 2011 and the sealing airbag 9 are both filled with gas. The first elastic member between the sliding frame 3 and the buffer part 2011 is located in the chamber of the buffer part 2011, and the sliding frame 3 slides in the chamber of the buffer part 2011. The chamber of the buffer part 2011 is connected with the sealing airbag 9. When the sliding frame 3 moves to the right, the gas in the chamber of the buffer part 2011 is squeezed into the sealing airbag 9, so that the sealing airbag 9 expands, thereby enhancing the sealing effect of the sealing airbag 9 on the shell 1 and the buffer part 2011.

[0057] The specific working principle is as follows:

[0058] When it is necessary to install the mounting seat 2 on the right side of the shell 1, the operator inserts the mounting seat 2, the connecting part 10 and the sealing airbag 9 into the right side of the shell 1. When the liquid pressure on the sliding frame 3 increases, the sliding frame 3 squeezes its first elastic part to contract, and the sliding frame 3 squeezes the gas in the upper chamber of the buffer part 2011. The gas in the upper chamber of the buffer part 2011 is squeezed into the sealing airbag 9. The greater the liquid pressure on the sliding frame 3, the greater the expansion volume of the sealing airbag 9. The connection between the buffer part 2011 and the shell 1 is adaptively sealed to prevent the sealing failure of the connection between the buffer part 2011 and the shell 1 due to the increase in the power of the cooling system, thereby causing liquid to seep out between the buffer part 2011 and the shell 1, thereby affecting the working efficiency of the device.

[0059] When the liquid pressure in the housing 1 decreases, the first elastic member of the sliding frame 3 rebounds and returns to its original position, and the sealing airbag 9 contracts and squeezes the gas therein into the upper chamber of the buffer portion 2011 .

[0060] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A cooling water pump with a noise reduction structure, characterized in that: Included are: A shell (1), wherein the shell (1) is connected to a suction pipe (101) and a discharge pipe (102); The mounting seat (2) is fixedly connected to the shell (1); the mounting seat (2) is rotatably connected to a rotating shaft (201) that penetrates into the shell (1); the rotating shaft (201) is driven by an output shaft of an external motor through an external coupling; the rotating shaft (201) is provided with a buffer portion (2011); the rotating shaft (201) is spline-connected to a rear cover plate (202); both sides of the rear cover plate (202) are respectively fixedly connected to circumferentially distributed first blades (2021) and circumferentially distributed second blades (2022); all the first blades (2021) are commonly fixedly connected to a front blade (2021) on a side away from the rear cover plate (202); A cover plate (203); a sliding frame (3) slidably connected in the buffer portion (2011); a first elastic member fixedly connected between the sliding frame (3) and the buffer portion (2011); the sliding frame (3) is fixedly connected with circumferentially distributed blocking blocks (301) whose number is the same as the number of the first blades (2021); all the first blades (2021) and all the blocking blocks (301) are alternately distributed; the rear cover plate (202) is provided with holes whose number is the same as the blocking blocks (301); and the blocking blocks (301) are used to block adjacent holes on the rear cover plate (202).

2. A cooling water pump with a noise reduction structure according to claim 1, characterized in that: The buffer portion (2011) is rotatably connected to the shell (1); the buffer portion (2011) and the shell (1) are sealed via a sealing gasket; and the diameter of the buffer portion (2011) is greater than the diameter of the rotating shaft (201).

3. The cooling water pump with a noise reduction structure according to claim 1, characterized in that: All holes on the rear cover plate (202) are located close to its axis, and are used to release the liquid pressure close to the center of the rear cover plate (202).

4. A cooling water pump with a noise reduction structure according to claim 3, characterized in that: Also included are: A guide block (4) is slidably connected to the rotating shaft (201) near the suction pipe (101), and the maximum diameter of the guide block (4) is greater than the diameter of the connection between the rotating shaft (201) and the rear cover plate (202).

5. The cooling water pump with a noise reduction structure according to claim 4, characterized in that: The diameter of the guide block (4) gradually increases from a position close to the suction pipe (101) to a position far away from it.

6. The cooling water pump with a noise reduction structure according to claim 5, characterized in that: Also included are: The sealing member (5) is fixedly connected to the guide block (4); the sealing member (5) is made of elastic material; and the side of the sealing member (5) away from the guide block (4) is closely attached to a position on the rotating shaft (201) close to the rear cover plate (202).

7. The cooling water pump with a noise reduction structure according to claim 6, characterized in that: Also included are: A pressure sensor (6) is mounted on the rotating shaft (201) and is located inside the sealing member (5); a second elastic member is fixedly connected between the guide block (4) and the pressure sensor (6); A regulating valve (7) is installed on the discharge pipe (102) and is used to regulate the flow of the discharge pipe (102).

8. The cooling water pump with a noise reduction structure according to claim 2, characterized in that: Also included are: A sealing ring (8) is fixedly connected to the sliding frame (3), a gap exists between the sealing ring (8) and the buffer portion (2011), and the sealing ring (8) is made of a flexible material and is used to seal the connection between the buffer portion (2011) and the shell (1).

9. The cooling water pump with a noise reduction structure according to claim 8, characterized in that: Also included are: A sealing airbag (9) is fixedly connected to the buffer portion (2011), and the diameter of the sealing airbag (9) gradually increases from a position close to the rear cover plate (202) to a position far away from the rear cover plate (202). The sealing airbag (9) is rotatably connected to the shell (1), and a connecting portion (10) is provided on one side of the mounting seat (2) close to the shell (1).

10. The cooling water pump with a noise reduction structure according to claim 9, characterized in that: A chamber is provided in the buffer portion (2011), a first elastic member between the sliding frame (3) and the buffer portion (2011) is located in the chamber, the sliding frame (3) slides in the chamber of the buffer portion (2011), and the chamber of the buffer portion (2011) is connected to the sealing airbag (9).

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