Single stage centrifugal pump

Abstract

This utility model discloses a single-stage centrifugal pump. A three-way valve is installed at the pump body's outlet. The second valve port is directly opposite and connected to the first valve port to form a main flow channel. The first valve port is connected to the main flow channel to form a secondary flow channel. A throttle is installed at the junction of the main flow channel and the secondary flow channel. When the pump is stopped, the throttle switches to a first position, blocking the junction of the main flow channel and the secondary flow channel. When the pump is running, the throttle switches to a second position, connecting the junction of the main flow channel and the secondary flow channel. Therefore, when air binding occurs in the centrifugal pump and the liquid flow in the main flow channel is interrupted, the throttle switches to the second position to connect the junction, starting the pump. The pump pumps liquid into the main flow channel, and the secondary flow channel provides liquid, allowing the main flow channel to re-absorb water. This effectively solves the air binding problem of the centrifugal pump and improves the stability and reliability of its operation.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and in particular to a single-stage centrifugal pump. Background Technology

[0002] Centrifugal pumps may experience air binding during startup or operation. This occurs because the presence of gas (such as air or non-condensable gases) within the pump body, or the liquid's tendency to bubble, can lead to excessive gas buildup. This prevents the impeller from effectively drawing in and transporting liquid, causing a sharp drop in pump flow rate and head, or even complete pumping failure. In other words, gas "occupies" the space within the pump that should be filled with liquid, hindering the normal flow of the liquid.

[0003] Prolonged air binding can cause dry wear damage to components such as impellers and seals, shortening the service life of the pump. In industrial production, air binding can lead to process interruptions, affecting production efficiency and product quality, among other negative impacts. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a single-stage centrifugal pump that can quickly eliminate air binding.

[0005] The objective of this utility model is achieved through the following technical solution: A single-stage centrifugal pump includes: a pump body, an impeller disposed within the pump body, an inlet and an outlet on the pump body, and a three-way valve disposed at the outlet. The three-way valve includes a first valve port, a second valve port, and a third valve port. The first valve port is connected to the inlet, and both the second and third valve ports are connected to a water source, with the third valve port connected to the water source via a water pump. The second valve port is directly opposite to and connected to the first valve port to form a main flow channel, and the first valve port is connected to the main flow channel to form a secondary flow channel. A flow throttle is disposed at the junction of the main flow channel and the secondary flow channel. When the water pump is stopped, the flow throttle switches to a first position, blocking the junction of the main flow channel and the secondary flow channel. When the water pump is in operation, the flow throttle switches to a second position, connecting the junction of the main flow channel and the secondary flow channel.

[0006] The beneficial effects of this utility model are as follows: A three-way valve is installed at the outlet, with its second and third ports both connected to the water source. A throttle is installed at the junction of the main flow channel and the secondary flow channel. The movement of the throttle controls the opening and closing of the main flow channel and the secondary flow channel. When the centrifugal pump is working normally, the pump stops, and there is no pumped water in the secondary flow channel. The throttle switches to the first position to block the junction, maintaining the seal of the main flow channel and ensuring the normal operation of the centrifugal pump. When the centrifugal pump experiences air binding, interrupting the liquid flow in the main flow channel, the throttle switches to the second position to connect the junction, starting the pump. The pump pumps liquid into the main flow channel, and the secondary flow channel provides liquid, allowing the main flow channel to re-absorb water. This effectively solves the air binding problem of the centrifugal pump and improves the stability and reliability of its operation.

[0007] The throttle includes a column and a large end at the end of the column. The column is at least partially located within the secondary flow channel, and the diameter of the large end exceeds the opening at the junction of the secondary flow channel and the main flow channel. When the throttle is in the first position, the side of the large end near the column is attached to and blocks the opening. When the throttle is in the second position, a first distance is spaced between the large end and the opening to allow communication between the main flow channel and the secondary flow channel.

[0008] The length of the throttle is greater than the diameter of the main flow channel.

[0009] The other end of the column is constructed in an arc shape.

[0010] In the transition area connecting the column and the large end, the diameter of the column gradually increases.

[0011] A disc extends from the periphery of the column and is arranged coaxially with the column. The periphery of the disc is adapted to abut against the inner wall of the secondary flow channel.

[0012] A first gap is left between the periphery of the disc and the inner wall of the secondary flow channel.

[0013] The column is arranged coaxially with the secondary flow channel, and the disk has one or more through holes along its own thickness.

[0014] There are at least two discs, and each disc is spaced apart along the axial direction of the column.

[0015] The three-way valve includes a first body and a second body arranged sequentially along the axis of the main flow channel. The first body is fitted to the water inlet. The diameter of the second body is smaller than that of the first body. The second body is used to connect to a pipeline. The pipeline is connected to the water source. A secondary pipe extends from the periphery of the second body. The secondary pipe defines the secondary flow channel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a single-stage centrifugal pump according to an embodiment of this application; Figure 2 This is a schematic cross-sectional view of a three-way valve with the throttle in the first position according to an embodiment of this application; Figure 3 This is a schematic cross-sectional view of a three-way valve with the throttle in the second position according to an embodiment of this application.

[0017] In the picture: 100-Single-stage centrifugal pump; 110 - Pump body, 111 - Water outlet; 120 - Three-way valve, 121 - First valve port, 122 - Second valve port, 123 - Third valve port, 124 - First unit body, 1241 - Secondary pipe, 125 - Second unit body; 130 - Throttling device, 131 - Column, 1311 - Disc, 132 - Large end; a-Main flow channel, b-Secondary flow channel, c-Opening. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] See Figures 1-3 This utility model provides a technical solution: A single-stage centrifugal pump 100 includes a pump body 110, within which an impeller (not shown) is disposed. The pump body 110 has an inlet (not shown) and an outlet 111. For example, the impeller adopts a semi-open or closed structure, with blades radially and uniformly distributed on the hub surface with a specific curvature. When the motor drives the pump shaft to rotate the impeller at high speed, liquid is drawn into the center of the impeller at the inlet due to the pressure difference. Under the action of centrifugal force, it is thrown towards the outer edge of the impeller along the blade flow channel. At this time, a partial vacuum is formed at the impeller outlet, continuously attracting new liquid to replenish it. The thrown liquid gains both kinetic and static pressure energy, and the kinetic energy is further converted into pressure energy through the diffusion effect of the volute-shaped pump cavity, finally being discharged at high speed from the outlet 111 to form a stable flow field.

[0020] refer to Figure 1As shown, a three-way valve 120 is provided at the outlet 111. The three-way valve 120 includes a first valve port 121, a second valve port 122, and a third valve port 123. The first valve port 121 is connected to the inlet, and the second valve port 122 and the third valve port 123 are both connected to a water source. The third valve port 123 is connected to the water source via a water pump. In this embodiment, the water source can be any liquid to be treated, and is not limited to water or must be primarily water. For example, the water source can be the water source of an industrial circulating water system, such as the water collection pool at the bottom of a large cooling tower.

[0021] like Figures 2-3 As shown, the second valve port 122 is directly opposite to and connected to the first valve port 121 to form a main flow channel a. The first valve port 121 is connected to the main flow channel a to form a secondary flow channel b. A throttle 130 is provided at the intersection of the main flow channel a and the secondary flow channel b. The throttle 130 may move itself to control the opening and closing of the main flow channel a and the secondary flow channel b.

[0022] In detail, under normal operating conditions, the centrifugal pump continuously draws liquid to the impeller, and there is no need to use the secondary flow channel b to pump water. When the pump stops operating, the secondary flow channel b does not pump water, and the throttle 130 switches to the first position, blocking the junction of the main flow channel a and the secondary flow channel b, thus maintaining the seal of the main flow channel a. When air binding occurs in the centrifugal pump, the liquid flow in the main flow channel a is interrupted; at this time, the throttle 130 can be switched to the second position to connect the junction of the main flow channel a and the secondary flow channel b, thereby starting the pump. When the pump is operating, it pumps water into the main flow channel a, and the secondary flow channel b provides liquid, allowing the main flow channel a to draw water again.

[0023] It is understood that in the single-stage centrifugal pump 100 of this application embodiment, the three-way valve 120 installed at the outlet 111 has its second valve port 122 and third valve port 123 both connected to the water source. A throttle valve 130 is installed at the junction of the main flow channel a and the secondary flow channel b. The movement of the throttle valve 130 controls the opening and closing of the main flow channel a and the secondary flow channel b. When the centrifugal pump is working normally, the pump stops, and there is no water pumped in the secondary flow channel b. The throttle valve 130 switches to the first position to block the junction, maintaining the seal of the main flow channel a and ensuring the normal operation of the centrifugal pump. When the centrifugal pump experiences air binding, and the liquid flow in the main flow channel a is interrupted, the throttle valve 130 switches to the second position to connect the junction, starting the pump. The pump pumps liquid into the main flow channel a, and the secondary flow channel b provides liquid, allowing the main flow channel a to re-absorb water. This effectively solves the air binding problem of the centrifugal pump and improves the stability and reliability of the centrifugal pump operation.

[0024] The throttle 130 includes a column 131 and a large end 132 at the end of the column 131. The column 131 is at least partially located within the secondary flow channel b, and the diameter of the large end 132 exceeds the opening c at the junction of the secondary flow channel b and the main flow channel a. In some examples, the surface of the column 131 is specially treated to have good wear resistance and a low coefficient of friction to ensure that the column 131 does not shift or wobble during movement within the secondary flow channel b. The diameter of the large end 132, exceeding the size of the opening c at the junction of the secondary flow channel b and the main flow channel a, can fully seal and fit the inner wall of the junction in the main flow channel a, effectively blocking the liquid flow between the main flow channel a and the secondary flow channel b. Furthermore, the large end 132 can be configured as... Figures 2-3 The streamlined structure shown in the diagram creates a downward fluid pressure as the water passes through the large end 132, keeping it closed.

[0025] In detail, when the throttle 130 is in the first position, the side of the large end 132 near the column 131 adheres to and blocks the opening c. (Reference) Figure 2 As shown, when the throttle 130 is in the second position, there is a first distance between the large end 132 and the opening c, so that the main channel a and the secondary channel b are connected. Therefore, when air binding occurs, the liquid flow in the main channel a is suddenly interrupted, and the water pressure that originally acted on the throttle 130 to keep it sealed also disappears. At this time, due to the lack of liquid filling, the pressure in the main channel a drops sharply, almost to a vacuum state. The user can immediately start the water pump. After the water pump starts working, the liquid in the water source is pumped into the secondary channel b under pressure. Since the secondary channel b and the main channel a are connected at this time (the throttle 130 is in the second position), and the pressure in the main channel a is much lower than the pressure in the secondary channel b, the high-pressure liquid in the secondary channel b quickly rushes towards the throttle 130. Under the impact of the high-pressure liquid, the large end 132 of the throttle 130, which was originally in a relatively loose state due to the loss of water pressure in the main channel a, is rapidly opened, forming a larger channel with the opening c. The liquid in the secondary channel b flows continuously into the main channel a through this channel, and then flows along the main channel a towards the impeller.

[0026] When the liquid reaches the impeller, the impeller continues to rotate at high speed under the drive of the motor, reapplying centrifugal force to the incoming liquid. Under the action of the impeller, the liquid once again gains a double boost in kinetic and static pressure energy. After diffusion through the volute-shaped pump chamber, the kinetic energy is further converted into pressure energy, and finally discharged from the outlet 111. In this way, the single-stage centrifugal pump 100 restarts its normal pumping process, effectively solving the problem of pumping interruption caused by air binding.

[0027] To ensure that the throttle 130 does not completely exit the secondary flow channel b, in this embodiment, the length of the throttle 130 is greater than the diameter of the main flow channel a, so that after the throttle 130 moves, at least a portion of the column 131 remains within the secondary flow channel b. In some examples, the other end of the column 131 is constructed in an arc shape to form a streamlined structure.

[0028] Continue to refer to Figures 2-3 As shown, the three-way valve 120 includes a first platform 124 and a second platform 125 arranged sequentially along the axis of the main channel a. The first platform 124 is fitted to the water inlet. The diameter of the second platform 125 is smaller than that of the first platform 125. The second platform 125 is used to connect to a pipeline connected to the water source. A secondary pipe 1241 extends from the periphery of the first platform 124, and the secondary flow channel b is defined within the secondary pipe 1241.

[0029] In the transition area connecting the column 131 and the large end 132, the diameter of the column 131 gradually increases and forms a large end 132 at the end. The side of the large end 132 near the first valve port 121 is arc-shaped, and the curvature of the other side gradually decreases to form a streamlined structure.

[0030] In some embodiments, a disk 1311 extends from the periphery of the column 131 and is coaxially arranged with the column 131, as shown in the reference. Figure 2 It is understood that the circumference of the disc 1311 is adapted to abut against the inner wall of the secondary flow channel b. When the water pump stops pumping water to the secondary flow channel b, the liquid will impact the secondary flow channel b from the main flow channel a because the impeller has re-established its suction effect on the main flow channel a. Figure 2 (In the direction of the middle arrow), the impact then strikes the disc 1311, causing the disc 1311 to drive the entire throttle 130 back to the point where the two meet. This allows the throttle 130 to easily switch between the first and second positions without requiring additional operating equipment, resulting in lower costs and simpler operation.

[0031] In some examples, a first gap is left between the periphery of the disc 1311 and the inner wall of the secondary flow channel b, and the column 131 is arranged coaxially with the secondary flow channel b. The disc 1311 has one or more through holes along its own thickness. Water can flow through the first gap, and the liquid flowing in the secondary flow channel b will also impact the disc 1311 to push the position of the throttle 130 to change.

[0032] In some embodiments, there are at least two discs 1311, and each disc 1311 is spaced apart along the axial direction of the column 131; in this way, the throttle 130 can maintain its axial movement by pushing against the inner peripheral wall of the secondary flow channel b through the periphery of the two discs 1311.

[0033] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A single-stage centrifugal pump, comprising: The pump body, wherein an impeller is disposed within the pump body, and an inlet and an outlet are constructed on the pump body, characterized in that: A three-way valve is provided at the outlet. The three-way valve includes a first valve port, a second valve port, and a third valve port. The first valve port is connected to the inlet. The second and third valve ports are both connected to the water source. The third valve port is connected to the water source through a water pump. The second valve port is directly opposite to and connected to the first valve port to form a main flow channel, and the first valve port is connected to the main flow channel to form a secondary flow channel. A throttle is provided at the intersection of the main flow channel and the secondary flow channel. When the water pump is stopped, the throttle switch is switched to the first position to block the intersection of the main flow channel and the secondary flow channel; when the water pump is working, the throttle switch is switched to the second position to connect the intersection of the main flow channel and the secondary flow channel.

2. The single-stage centrifugal pump according to claim 1, characterized in that: The throttle includes a column and a large end at the end of the column, the column being at least partially located within the secondary flow channel, and the diameter of the large end exceeding the opening at the junction of the secondary flow channel and the main flow channel; When the throttle is in the first position, the side of the large end near the column is attached to and blocks the opening; when the throttle is in the second position, there is a first distance between the large end and the opening, so that the main flow channel and the secondary flow channel are connected.

3. The single-stage centrifugal pump according to claim 2, characterized in that: The length of the throttle is greater than the diameter of the main flow channel.

4. The single-stage centrifugal pump according to claim 2, characterized in that: The other end of the column is constructed in an arc shape.

5. The single-stage centrifugal pump according to claim 2, characterized in that: In the transition area connecting the column and the large end, the diameter of the column gradually increases.

6. The single-stage centrifugal pump according to claim 2, characterized in that: A disc extends from the periphery of the column and is arranged coaxially with the column. The periphery of the disc is adapted to abut against the inner wall of the secondary flow channel.

7. The single-stage centrifugal pump according to claim 6, characterized in that: A first gap is left between the periphery of the disc and the inner wall of the secondary flow channel.

8. The single-stage centrifugal pump according to claim 6, characterized in that: The column is arranged coaxially with the secondary flow channel, and the disk has one or more through holes along its own thickness.

9. The single-stage centrifugal pump according to claim 7 or 8, characterized in that: There are at least two discs, and each disc is spaced apart along the axial direction of the column.

10. The single-stage centrifugal pump according to claim 1, characterized in that: The three-way valve includes a first body and a second body arranged sequentially along the axis of the main flow channel. The first body is fitted to the water inlet. The diameter of the second body is smaller than that of the first body. The second body is used to connect to a pipeline. The pipeline is connected to the water source. A secondary pipe extends from the periphery of the second body. The secondary pipe defines the secondary flow channel.

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