Negative pressure pump

Abstract

The utility model discloses a negative pressure pump, which relates to the technical field of negative pressure pumps and comprises a motor, a pump support body fixed on one side of the motor, a sealing plate arranged on one side of the pump support body far away from the motor, an open impeller arranged on one side of the sealing plate far away from the motor, a spiral blade arranged on one side of the open impeller far away from the motor, and a pump shell arranged on one side of the spiral blade far away from the motor. By arranging the cylinder and the spiral blade, the motor drives the spiral blade to rotate in the cylinder so that negative pressure can be generated in the cylinder, water can be conveniently sucked into the pump shell from the cylinder, and meanwhile the shape of the inner sealing plate is changed so that the water can be conveniently sucked into the pump shell. The optimized annular groove flow channel is formed in the rear cover plate of the pump body, so that a complete liquid baffle can be formed in the rear portion of the open impeller, liquid is prevented from being thrown out behind the impeller, and the liquid can efficiently rotate in the impeller and is guided into the convex flow channel along the pump cavity.

Description

TECHNICAL FIELD

[0001] The utility model relates to negative pressure pump technical field, specifically a kind of negative pressure pump. BACKGROUND

[0002] Negative pressure pump is a kind of equipment for generating negative pressure (i.e. below atmospheric pressure). It extracts gas or liquid from a closed system through a series of mechanical or electronic components, thereby creating a negative pressure environment.

[0003] The disadvantage of the inner sealing plate in the existing negative pressure pump is that the concave portion behind the open impeller blocking plate is not shielded, causing the fluid of the open impeller to be thrown out to the concave portion behind, reducing the efficiency of the open impeller, and resulting in poor water delivery effect of the negative pressure pump. Therefore, technical innovation and design optimization are needed to optimize the negative pressure pump. SUMMARY

[0004] The disadvantage of the inner sealing plate in the existing negative pressure pump is that the concave portion behind the open impeller blocking plate is not shielded, causing the fluid of the open impeller to be thrown out to the concave portion behind, reducing the efficiency of the open impeller, and resulting in poor water delivery effect of the negative pressure pump. To solve the above problems, the present application provides a negative pressure pump. By setting a cylinder and a spiral blade, the rotation of the spiral blade in the cylinder driven by the motor can generate negative pressure in the cylinder, facilitating the suction of water from the cylinder into the pump shell. By changing the shape of the inner sealing plate and opening an optimized annular groove flow channel on the pump body rear cover plate, a complete blocking plate can be formed behind the open impeller, preventing liquid from being thrown out behind the impeller. The liquid can efficiently rotate in the impeller and be guided into the convex flow channel along the pump cavity. By optimizing the design of the annular groove flow channel, the hydraulic loss is greatly reduced, effectively improving the flow and pressure of the pump, and significantly improving the pump lift. By setting the convex flow channel, the convex flow channel has the functions of enhancing the momentum of the inlet fluid, reducing the pressure difference at the liquid inlet, reducing the cavitation allowance of the pump, improving the suction force at the pump inlet, and reducing the circumferential flow of liquid in the pump cavity, forcing the viscous medium to flow in the outlet direction. By increasing the pressure, a high negative pressure suction state is formed at the inlet, and the design is durable, compact, lightweight, easy to clean and low in energy consumption.

[0005] The technical solution adopted by the present application to solve its technical problems is:

[0006] A negative pressure pump, comprising:

[0007] A motor is fixed on one side of the pump support body, and a sealing plate is provided on the side of the pump support body away from the motor. An open impeller is provided on the side of the sealing plate away from the motor. A spiral blade is provided on the side of the open impeller away from the motor. A pump shell is provided on the side of the spiral blade away from the motor. A cylinder is fixed on the pump shell.

[0008] The sealing plate comprises a pump body rear cover plate, a shaft hole is formed on the pump body rear cover plate at the position of the mechanical seal cleaning cavity, a mechanical seal spring seat is arranged on one side of the pump body rear cover plate, a pump body sealing groove is formed on the pump body rear cover plate, and a liquid blocking plate is fixed on the pump body rear cover plate.

[0009] In a possible implementation, a water inlet is formed on the cylinder, and a water outlet is formed on the pump shell, so that water can enter the interior of the pump shell from the water inlet and be discharged from the water outlet.

[0010] In a possible implementation, an optimized annular groove flow channel is formed on the pump body rear cover plate, and the inner wall of the optimized annular groove flow channel is arc-shaped, and a convex flow channel is formed on the liquid blocking plate.

[0011] The optimized annular groove flow channel ensures that liquid gathered by the liquid blocking plate at the rear of the open impeller cannot be thrown out of the rear of the open impeller, guarantees that the liquid can be efficiently rotated in the open impeller and guided into the convex flow channel along the pump cavity, reduces hydraulic loss, thereby increasing the flow rate and pressure of the pump, improving the lift of the pump, and also ensuring that the fluid cannot be subjected to negative effects such as shearing and vibration, guaranteeing the quality and stability of the liquid. For the transportation of corrosive environments or high-temperature fluids, the design can also maintain good performance and durability, and is suitable for more demanding industrial applications.

[0012] Meanwhile, the application of the optimized annular groove flow channel design is very extensive and is suitable for various industries and fluid types, especially the transportation of high-viscosity, particulate or sensitive liquids. It can not only efficiently handle traditional water-based liquids, but also handle complex liquid media such as dairy products, chemical solutions, food and beverages, and pharmaceuticals. In fluid transportation systems that require high precision and high efficiency, it can ensure that the fluid cannot be subjected to negative effects such as shearing and vibration, guaranteeing the quality and stability of the liquid. For the transportation of corrosive environments or high-temperature fluids, the design can also maintain good performance and durability, and is suitable for more demanding industrial applications.

[0013] The convex flow channel has the effects of enhancing the momentum of the inlet fluid, reducing the pressure difference at the liquid inlet, reducing the net positive suction head of the pump, improving the suction of the pump inlet, thereby reducing the circumferential flow of the liquid in the pump cavity, forcing the viscous medium to flow to the outlet direction, and increasing the pressure to form a high negative pressure suction state at the inlet. At the same time, the design has strong durability, and also has the advantages of compactness, light weight, easy cleaning and low energy consumption.

[0014] Due to the convex flow channel design optimizing the hydraulic performance of the pump, reducing the turbulence of the internal liquid flow, which directly reduces the wear and tear of the components inside the pump, thereby improving the durability and service life of the pump. Reduce cavitation, differential pressure fluctuation and liquid turbulence and other problems, the pump can maintain stable performance under long time high load operation, reduce the failure rate and maintenance demand. For those in high load or continuous operation application (such as dairy products processing, pharmaceutical, chemical industry, etc.), reducing downtime and maintenance costs is crucial, extending the service life of the equipment is the key to improve production efficiency and reduce total cost of ownership.

[0015] In addition, this design also effectively reduces noise and vibration, reduces the mechanical burden and environmental noise of the pump during operation, helps to create a quieter and more comfortable working environment. In addition, the low noise and low vibration operation mode prolongs the service life of the pump and related equipment, reduces maintenance costs and downtime.

[0016] In a possible implementation manner, a plurality of pump body fixing holes are formed on the pump body rear cover plate, and a plurality of bolts are arranged in the pump body fixing holes, so that the pump body rear cover plate and the pump shell are fixedly connected through the bolts, thereby facilitating the fixation of the pump body rear cover plate and the pump shell and forming a sealed space.

[0017] In a possible implementation manner, a spring seat fixing threaded hole is formed on the pump body rear cover plate, and the mechanical seal spring seat is threadedly connected to the pump body rear cover plate through a screw, thereby facilitating the fixation of the mechanical seal spring seat and the pump body rear cover plate.

[0018] In a possible implementation manner, a pump support fixing threaded hole is formed on the pump body rear cover plate, and the pump support fixing threaded hole is fixed to the pump support body through a bolt, thereby facilitating the fixation of the pump support fixing threaded hole and the pump support body.

[0019] In a possible implementation manner, the motor output end penetrates through the pump support body and is inserted into the shaft hole, a fixing hole is formed on the open impeller, a fixing groove is formed on the spiral blade, the motor output end penetrates through the fixing hole and is inserted into the fixing groove, the motor drives the open impeller and the spiral blade to rotate, and water flow enters the pump shell under the action of the open impeller and the spiral blade.

[0020] In a possible implementation manner, the motor output end is fixedly connected to the open impeller and the spiral blade, and the spiral blade is located in the cylinder, thereby facilitating the rotation of the spiral blade in the cylinder to form negative pressure.

[0021] In summary, the utility model has at least one of the following beneficial technical effects:

[0022] 1. By setting the cylinder and spiral blade, the motor drives the spiral blade to rotate in the cylinder to generate negative pressure in the cylinder, facilitating the suction of water from the cylinder into the pump shell.

[0023] 2. By changing the shape of the inner sealing plate, the optimization annular groove flow channel is arranged on the pump body rear cover plate, so that the open impeller rear part can form a complete liquid baffle, preventing the liquid from being thrown out behind the impeller, and the liquid can rotate efficiently in the impeller and be guided into the convex flow channel along the pump cavity.

[0024] 3. By optimizing the design of the annular groove flow channel, the water loss is greatly reduced, thereby effectively improving the flow and pressure of the pump, and significantly improving the lift of the pump.

[0025] 4. By setting the convex flow channel, the convex flow channel has the effects of enhancing the momentum of the inlet fluid, reducing the pressure difference at the liquid inlet, reducing the pump cavitation allowance, improving the suction of the pump inlet, thereby reducing the circumferential flow of the liquid in the pump cavity, forcing the viscous medium to flow to the outlet direction, increasing the pressure, and forming a high negative pressure suction state at the inlet, while the design has strong durability, compactness, light weight, easy cleaning and low energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a whole structure schematic view of the utility model;

[0027] Figure 2 It is a whole structure explosion schematic view of the utility model;

[0028] Figure 3 It is a local structure schematic view of the utility model;

[0029] Figure 4 It is an inner sealing plate structure schematic view of the utility model;

[0030] Figure 5 It is an inner sealing plate side view of the utility model;

[0031] Figure 6 It is an inner sealing plate back structure schematic view of the utility model.

[0032] Fig. 1, water inlet; 2, pump shell; 3, drain; 4, pump support body; 5, motor; 6, pump body rear cover plate; 7, cylinder; 8, spiral blade; 9, open impeller; 10, liquid baffle; 11, fixed groove; 12, fixed hole; 13, shaft hole; 14, mechanical seal cleaning cavity; 15, convex flow channel; 16, pump body sealing groove; 17, optimization annular groove flow channel; 18, pump body fixed hole; 19, spring seat fixed threaded hole; 20, pump support fixed threaded hole; 21, pump body fixed hole. DETAILED DESCRIPTION

[0033] The technical solutions in the utility model will be clearly and completely described below with reference to the drawings in the utility model, and additionally, the forms of each structure described in the following implementation manners are only examples, and the instrument placing rack involved in the utility model is not limited to each structure described in the following implementation manners, and all other implementation manners obtained by the ordinary skilled in the art without creative labor belong to the protection range of the utility model.

[0034] This embodiment introduces a specific structure of a negative pressure pump, and specifically refers to Figures 1-6 The negative pressure pump comprises:

[0035] A motor 5 is fixed with a pump support body 4 on one side, a sealing plate is arranged on the side of the pump support body 4 away from the motor 5, an open impeller 9 is arranged on the side of the sealing plate away from the motor 5, a spiral blade 8 is arranged on the side of the open impeller 9 away from the motor 5, a pump shell 2 is arranged on the side of the spiral blade 8 away from the motor 5, and a cylinder 7 is fixed on the pump shell 2.

[0036] The sealing plate comprises a pump body back cover plate 6, a mechanical seal cleaning cavity 14 is formed in the pump body back cover plate 6, a shaft hole 13 is formed in the pump body back cover plate 6 at the position of the mechanical seal cleaning cavity 14, a mechanical seal spring seat is arranged on one side of the pump body back cover plate 6, a pump body sealing groove 16 is formed in the pump body back cover plate 6, and a liquid blocking plate 10 is fixed on the pump body back cover plate 6.

[0037] Further, a water inlet 1 is formed in the cylinder 7, and a water outlet 3 is formed in the pump shell 2, so that water can enter the inside of the pump shell 2 from the water inlet 1 and be discharged from the water outlet 3.

[0038] It is worth noting that an optimized annular groove flow channel 17 is formed in the pump body back cover plate 6, the inner wall of the optimized annular groove flow channel 17 is arranged in an arc shape, and a convex flow channel 15 is formed in the liquid blocking plate 10.

[0039] The optimized annular groove flow channel 17 makes the liquid gathered by the complete liquid blocking plate 10 behind the open impeller 9 not be thrown out behind the open impeller 9, guarantees that the liquid can rotate efficiently in the open impeller 9 and be guided into the convex flow channel 15 along the pump cavity, reduces hydraulic loss, thereby increasing the flow and pressure of the pump, improving the lift of the pump, and also can ensure that the fluid is not subjected to negative effects such as shearing and vibration, guaranteeing the quality and stability of the liquid. For the transportation of corrosive environment or high-temperature fluid, the design can also maintain good performance and durability, and is suitable for more harsh industrial applications.

[0040] The application of simultaneously optimizing the design of the annular groove flow channel 17 is very extensive, suitable for various industries and fluid types, especially for the transportation of high viscosity, particulate or sensitive liquids. It can not only efficiently handle traditional water-based liquids, but also complex liquid media such as dairy products, chemical solutions, food and beverages, pharmaceuticals, etc. In fluid transportation systems requiring high precision and efficiency, it can ensure that the fluid is not affected by shear, vibration and other negative factors, ensuring the quality and stability of the liquid. For the transportation of corrosive environments or high-temperature fluids, this design can maintain good performance and durability, suitable for more demanding industrial applications.

[0041] The convex flow channel 15 has the effect of enhancing the momentum of the inlet fluid, reducing the pressure difference at the liquid inlet, reducing the pump's cavitation allowance, and improving the suction of the pump inlet, thereby reducing the circumferential flow of the liquid in the pump cavity, forcing the viscous medium to flow in the outlet direction, and increasing the pressure to form a high negative pressure suction state at the inlet. At the same time, this design is durable, compact, lightweight, easy to clean and low in energy consumption.

[0042] Due to the optimized hydraulic performance of the pump by the convex flow channel 15 design, the internal liquid flow is reduced, which directly reduces the wear of the pump components, thereby improving the durability and service life of the pump. Reduce cavitation, pressure difference fluctuations and liquid turbulence, etc. The pump can maintain stable performance under long-term high-load operation, reducing the failure rate and maintenance requirements. For those applications in high-load or continuous operation (such as dairy processing, pharmaceuticals, chemicals, etc.), reducing downtime and maintenance costs is crucial, and extending the service life of the equipment is key to improving production efficiency and reducing total ownership cost.

[0043] In addition, this design also effectively reduces noise and vibration, reducing the mechanical burden and environmental noise of the pump during operation, helping to create a quieter and more comfortable working environment. In addition, low noise and low vibration operation mode prolongs the service life of the pump and related equipment, reduces maintenance costs and downtime.

[0044] At the same time, the pump body rear cover plate 6 is provided with a plurality of pump body fixing holes 211812, and a plurality of bolts are arranged in the pump body fixing holes 211812. The pump body rear cover plate 6 is fixedly connected with the pump shell 2 through the bolts, so as to fix the pump body rear cover plate 6 with the pump shell 2 and form a sealed space.

[0045] At the same time, the pump body rear cover plate 6 is provided with a spring seat fixing screw hole 19, and the mechanical seal spring seat is screwed with the pump body rear cover plate 6 through screws, so as to fix the mechanical seal spring seat with the pump body rear cover plate 6.

[0046] Further, the pump body rear cover plate 6 is provided with a pump support fixing threaded hole 20, the pump support fixing threaded hole 20 can be fixed with the pump support body 4 through bolts, so as to facilitate the fixing of the pump support fixing threaded hole 20 and the pump support body 4.

[0047] More, the motor 5 output end penetrates the pump support body 4 and is inserted into the shaft hole 13, the open impeller 9 is provided with a fixing hole 12, the spiral blade 8 is provided with a fixing groove 11, the motor 5 output end penetrates the fixing hole 12 and is inserted into the fixing groove 11, the motor 5 drives the open impeller 9 and the spiral blade 8 to rotate, and the water flow will enter the pump shell 2 under the action of the open impeller 9 and the spiral blade 8.

[0048] In addition, the motor 5 output end is fixedly connected with the open impeller 9 and the spiral blade 8, and the spiral blade 8 is located in the cylinder 7, so as to facilitate the rotation of the spiral blade 8 in the cylinder 7 to form negative pressure.

[0049] When the staff needs to fix the pump body rear cover plate 6 and the motor 5, the mechanical seal spring seat is fixed with the pump body rear cover plate 6 through screws, then the inner sealing plate is fixed with the pump support body 4 through bolts, the open impeller 9 is installed on the motor 5 output end, and finally the pump shell 2 is fixed with the inner sealing plate through bolts,

[0050] In use, the motor 5 is started, the motor 5 drives the open impeller 9 and the spiral blade 8 to rotate, the water flow enters the pump shell 2 from the water inlet 1 on the cylinder 7 and rotates on the open impeller 9, and then enters the convex flow channel 15 and is discharged from the water outlet through the optimized annular groove flow channel 17.

[0051] Finally, it should be noted that: obviously, the above examples are only examples for clearly illustrating the utility model, and are not limited to the implementation. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or variations can be made. Here, it is not necessary and impossible to enumerate all the implementation. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A negative pressure pump, characterized in that, include: A motor (5) is provided with a pump bracket body (4) fixed on one side of the motor (5). A sealing plate is provided on the side of the pump bracket body (4) away from the motor (5). An open impeller (9) is provided on the side of the sealing plate away from the motor (5). A spiral blade (8) is provided on the side of the open impeller (9) away from the motor (5). A pump casing (2) is provided on the side of the spiral blade (8) away from the motor (5). A cylinder (7) is fixed on the pump casing (2). The sealing plate includes a pump body rear cover plate (6), on which a mechanical seal cleaning chamber (14) is opened, and a shaft hole (13) is opened on the pump body rear cover plate (6) at the position of the mechanical seal cleaning chamber (14). A mechanical seal spring seat is provided on one side of the pump body rear cover plate (6), and a pump body sealing groove (16) is opened on the pump body rear cover plate (6). A baffle plate (10) is fixed on the pump body rear cover plate (6).

2. A negative pressure pump as described in claim 1, characterized in that: The cylinder (7) has a water inlet (1), and the pump casing (2) has a drain outlet (3).

3. A negative pressure pump as described in claim 1, characterized in that: The pump body rear cover plate (6) is provided with an optimized annular groove flow channel (17), the inner wall of the optimized annular groove flow channel (17) is arc-shaped, and the baffle plate (10) is provided with a convex flow channel (15).

4. A negative pressure pump as described in claim 1, characterized in that: The pump body rear cover plate (6) is provided with a plurality of pump body fixing holes (21)(18)(12), and bolts are provided inside the plurality of pump body fixing holes (21)(18)(12). The pump body rear cover plate (6) and the pump shell (2) are fixedly connected by bolts.

5. A negative pressure pump as described in claim 1, characterized in that: The pump body rear cover plate (6) is provided with a spring seat fixing threaded hole (19), and the mechanical seal spring seat is threadedly connected to the pump body rear cover plate (6) by screws.

6. A negative pressure pump as described in claim 1, characterized in that: The pump body rear cover plate (6) is provided with a pump bracket fixing threaded hole (20), which can be fixed to the pump bracket body (4) by bolts.

7. A negative pressure pump as described in claim 1, characterized in that: The output end of the motor (5) passes through the pump bracket body (4) and is inserted into the shaft hole (13). The open impeller (9) has a fixing hole (12) and the spiral blade (8) has a fixing groove (11). The output end of the motor (5) passes through the fixing hole (12) and is inserted into the fixing groove (11).

8. A negative pressure pump as described in claim 7, characterized in that: The output end of the motor (5) is fixedly connected to the open impeller (9) and the helical blade (8), and the helical blade (8) is located inside the cylinder (7).

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