Liquid inlet and air inlet prevention device of single-screw pump

Abstract

The utility model relates to the technical field of single-screw pumps, in particular to a single-screw pump liquid inlet and air inlet prevention device which comprises a single-screw pump body. The telescopic hose is connected to the liquid inlet of the liquid adding pipe, and the linkage start-stop mechanism composed of the liquid pumping head, the fixing plate, the liquid adding delay switch, the guide sleeve, the ejector rod, the swing plate, the support, the connecting rod, the floating plate and the guide sliding rod is installed on the portion, on the lower side of the telescopic hose, of the liquid storage tank. The floating plate drives the connecting rod to move downwards, after the connecting rod moves downwards, the ejector rod moves upwards along the guide sleeve through the swing plate, and after the ejector rod moves upwards, the liquid adding delay switch is pressed, so that delayed starting of the liquid adding pump is achieved, automatic liquid adding in the liquid storage tank is achieved, and it is ensured that a liquid pumping head can be always located below the liquid level in the liquid storage tank in the liquid inlet process of the single-screw pump body; cavitation damage caused by air suction during liquid feeding of the single-screw pump body is avoided, and liquid feeding of the single-screw pump is more stable and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of single screw pump, in particular to a single screw pump liquid inlet anti-air device. BACKGROUND

[0002] Single screw pump is a common positive displacement pump, widely used in fluid delivery, pressurization and processing of various liquids, especially in chemical industry, petroleum industry, food processing industry and other industries. Its working principle and structural characteristics make it show excellent performance in processing high viscosity and solid particle containing fluid.

[0003] The existing single screw pump is first installed with a liquid inlet pipe at the liquid inlet port of the single screw pump during the delivery process of viscous liquid, then a filter screen is installed at the liquid inlet of the liquid inlet pipe, and the liquid inlet of the liquid inlet pipe is extended below the liquid level in the liquid tank, so as to avoid air being sucked into the single screw pump due to the liquid level of viscous liquid being lower than the liquid inlet port of the liquid inlet pipe during liquid inlet, and prevent the single screw pump from being damaged by cavitation during use.

[0004] Although the existing single screw pump can effectively avoid air being sucked into the single screw pump due to the liquid level of viscous liquid being lower than the liquid inlet port of the liquid inlet pipe during liquid inlet by extending the liquid inlet port of the liquid inlet pipe below the liquid level in the liquid tank, as the liquid delivery process continues, the liquid level in the liquid tank is constantly lowered, and at present, the liquid is added to the liquid tank in time mainly through the way of workers' inspection from time to time, but there is a risk that the liquid level in the liquid tank will be too low due to the workers' inspection not being timely, which will cause the single screw pump to suck in air during liquid inlet and cause the single screw pump to be damaged by cavitation. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a single screw pump liquid inlet anti-air device which can realize automatic starting of the liquid adding pump through the change of the liquid level, ensure that the liquid suction head is always below the liquid level in the liquid tank, and avoid the single screw body from sucking in air during liquid inlet.

[0006] The above application purpose of the present application is realized by the following technical scheme:

[0007] The utility model provides an anti-air intake device of single screw pump liquid inlet, including single screw pump body, one side of single screw pump body is provided with liquid storage tank, and the liquid inlet of single screw pump body is installed with liquid inlet pipe, and the liquid inlet of liquid inlet pipe is connected with telescopic hose, and the linkage start -stop mechanism is installed to one side of telescopic hose in liquid storage tank, and the liquid outlet of liquid supplementing pump is installed with liquid supplementing pipe, and the linkage start -stop mechanism includes liquid pumping head, fixed plate, liquid supplementing delay switch, guide sleeve, jacks, swing plate, support, connecting rod, float plate and guide slide, wherein the float plate is located on the liquid surface of liquid storage tank, the guide slide has four, four guide slides are respectively through the four corners of float plate, the liquid pumping head is installed in the middle part of float plate, one side of the top end of float plate is installed with connecting rod, the top end of connecting rod is connected with swing plate, the end away from connecting rod of swing plate is connected with jacks, the support is installed on the lower side of swing plate on the liquid storage tank, the guide sleeve is installed on the liquid storage tank and opposite jacks, the fixed plate is installed above jacks, and the liquid supplementing delay switch is installed at the bottom end of fixed plate and opposite jacks.

[0008] Optionally, the bottom end of the liquid pumping head is also provided with a filter cover, and the middle part of the filter cover is a mesh structure.

[0009] Optionally, the liquid pumping head is bonded to the float plate, one end of the telescopic hose is connected to the liquid pumping head, and the other end of the telescopic hose is connected to the liquid inlet pipe.

[0010] Optionally, the bottom end of the guide slide is inserted into the liquid storage tank, and the guide slide is slidingly connected to the float plate.

[0011] Optionally, the bottom end of the connecting rod is rotatably connected to the float plate, and the top end of the connecting rod is rotatably connected to the swing plate.

[0012] Optionally, the swing plate has an H-shaped structure, and the swing plate is rotatably connected to the bottom of the jacks.

[0013] Optionally, the support is composed of a horizontal plate and a connecting frame installed on the horizontal plate, and the support is rotatably connected to the middle part of the swing plate.

[0014] Optionally, the jacks penetrate through the guide sleeve and are slidingly connected to the guide sleeve, and the guide sleeve is welded to the side wall of the liquid storage tank through the rod.

[0015] Optionally, the liquid supplementing delay switch is electrically connected to the liquid supplementing pump, and the liquid supplementing pump is flange-connected to the liquid supplementing pipe.

[0016] In summary, the present application has at least one of the following beneficial technical effects:

[0017] This invention connects a telescopic hose to the inlet of the filling pipe and installs a linkage start-stop mechanism on the storage tank below the telescopic hose. This mechanism consists of a suction head, a fixed plate, a filling delay switch, a guide sleeve, a push rod, a swing plate, a bracket, a connecting rod, a float plate, and a guide slide rod. When the liquid level in the storage tank drops, the float plate drives the connecting rod to move downward. After the connecting rod moves downward, it moves the push rod upward along the guide sleeve with the help of the swing plate. After the push rod moves upward, it presses the filling delay switch to realize the delayed start of the filling pump, thereby achieving automatic filling of the storage tank. This ensures that the suction head of the single screw pump body is always below the liquid level in the storage tank during the filling process, avoiding cavitation damage caused by air being drawn into the single screw pump body during filling, and making the single screw pump filling more stable and efficient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure provided in the embodiments of this application;

[0019] Figure 2 This is a front sectional view of the liquid storage tank provided in the embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the linkage start-stop mechanism and telescopic hose provided in the embodiments of this application;

[0021] Figure 4 This is a schematic diagram of the structure of the filter cover provided in the embodiment of this application.

[0022] Explanation of reference numerals in the attached drawings: 1. Single screw pump body; 2. Liquid filling pump; 3. Liquid filling pipe; 4. Liquid inlet pipe; 5. Liquid storage tank; 6. Linkage start / stop mechanism; 61. Liquid suction head; 62. Fixing plate; 63. Liquid filling delay switch; 64. Guide sleeve; 65. Top rod; 66. Swing plate; 67. Bracket; 68. Connecting rod; 69. Float plate; 610. Guide slide rod; 7. Telescopic hose; 8. Filter cover. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the accompanying drawings.

[0024] To better understand the technical solutions presented in the embodiments of this application, the outdated liquid feeding principle of existing single screw pumps for transporting viscous liquids will first be introduced.

[0025] When a single screw pump is used to pump viscous liquids, an inlet pipe is first installed at the inlet port of the pump. Then, a filter screen is installed at the inlet of the inlet pipe, and the inlet of the inlet pipe is extended below the liquid level in the storage tank. This is to prevent air from being drawn into the single screw pump when the liquid level of the viscous liquid is below the inlet port of the inlet pipe, thus preventing cavitation damage to the single screw pump during use.

[0026] Please seeFigures 1-3 The single-screw pump liquid inlet air-preventing device disclosed by the embodiment of the application comprises a single-screw pump body 1, a liquid storage tank 5 arranged on one side of the single-screw pump body 1, a liquid inlet pipe 4 installed at the liquid inlet of the single-screw pump body 1, a flexible hose 7 connected to the liquid inlet of the liquid inlet pipe 4, a linkage start-stop mechanism 6 installed at one side of the flexible hose 7 in the liquid storage tank 5, a liquid adding pump 2 installed on the upper part of the side wall of the liquid storage tank 5, a liquid adding pipe 3 installed at the liquid outlet of the liquid adding pump 2, and the linkage start-stop mechanism 6 comprises a liquid suction head 61, a fixed plate 62, a liquid adding time-delay switch 63, a guide sleeve 64, a jacking rod 65, a swing plate 66, a support 67, a connecting rod 68, a floating plate 69, and four guide sliding rods 610, wherein the floating plate 69 is located above the liquid surface in the liquid storage tank 5, the four guide sliding rods 610 are respectively arranged through the four corners of the floating plate 69, the liquid suction head 61 is installed in the middle of the floating plate 69, the connecting rod 68 is installed on one side of the top end of the floating plate 69, the swing plate 66 is connected to the top end of the connecting rod 68, the jacking rod 65 is connected to one end of the swing plate 66 away from the connecting rod 68, the support 67 is installed on the lower side of the swing plate 66 on the liquid storage tank 5, the guide sleeve 64 is installed on the liquid storage tank 5 opposite to the jacking rod 65, the fixed plate 62 is installed above the jacking rod 65, and the liquid adding time-delay switch 63 is installed at the bottom end of the fixed plate 62 opposite to the jacking rod 65.

[0027] Specifically, during the liquid inlet process of the single-screw pump body 1, as the liquid surface in the liquid storage tank 5 is continuously lowered, the floating plate 69 will drive the connecting rod 68 to move downward, the connecting rod 68 will drive the jacking rod 65 to move upward along the guide sleeve 64 by means of the swing plate 66 after moving downward, and the jacking rod 65 will press the liquid adding time-delay switch 63 after moving upward, so as to realize the time-delay start of the liquid adding pump 2, realize the automatic liquid adding in the liquid storage tank 5, and ensure that the liquid suction head 61 can always be below the liquid surface in the liquid storage tank 5 during the liquid inlet process of the single-screw pump body 1, thereby avoiding the single-screw pump body 1 from sucking in air and causing cavitation damage during the liquid inlet process.

[0028] Please refer to Figure 2 and Figure 4 , and the bottom end of the liquid suction head 61 is further provided with a filter cover 8, and the middle part of the filter cover 8 is a mesh structure.

[0029] As an implementation mode, the filter cover 8 can filter the viscous liquid entering the liquid suction head 61, so as to avoid large-particle impurities in the viscous liquid from entering the single-screw pump body 1 and causing the single-screw pump body 1 to be blocked and damaged.

[0030] Please refer to Figure 2 and Figure 3 , the liquid suction head 61 is bonded to the floating plate 69, one end of the flexible hose 7 is connected to the pipe hoop of the liquid suction head 61, and the other end of the flexible hose 7 is connected to the pipe hoop of the liquid inlet pipe 4.

[0031] As an implementation form, the telescopic hose 7 is mainly used for connecting the suction head 61 with the liquid inlet pipe 4, and the telescopic hose 7 can also be telescoped with the up-down movement of the floating plate 69, so as to ensure that the viscous liquid in the liquid storage tank 5 can be stably guided into the liquid inlet pipe 4.

[0032] Please refer to Figure 2 The bottom end of the guide slide rod 610 is inserted into the liquid storage tank 5, and the guide slide rod 610 is slidably connected with the floating plate 69.

[0033] As an implementation form, the guide slide rod 610 can ensure the stable up-down movement of the floating plate 69, so as to avoid the skewing of the floating plate 69 during the up-down movement.

[0034] Please refer to Figure 2 and Figure 3 The bottom end of the connecting rod 68 is rotatably connected with the floating plate 69, and the top end of the connecting rod 68 is rotatably connected with the swing plate 66.

[0035] As an implementation form, after the connecting rod 68 moves downward with the floating plate 69, one end of the swing plate 66 is pulled downward, and at this time, the other end of the swing plate 66 lifts the top rod 65, so as to realize the opening of the liquid adding delay switch 63; and after the connecting rod 68 moves upward with the floating plate 69, the end of the swing plate 66 connected with the connecting rod 68 is lifted, and at this time, the top rod 65 moves downward under the action of the other end of the swing plate 66, so as to separate the top rod 65 from the liquid adding delay switch 63.

[0036] Please refer to Figure 2 and Figure 3 The swing plate 66 has an H-shaped structure, and the swing plate 66 is rotatably connected with the bottom of the top rod 65.

[0037] As an implementation form, the connecting parts of the swing plate 66 with the top rod 65 and the connecting rod 68 are all recessed groove structures, so as to ensure that the connecting rod 68 and the top rod 65 have a certain rotating space relative to the swing plate 66.

[0038] Please refer to Figure 2 and Figure 3 The support 67 is composed of a horizontal plate and a connecting frame mounted on the horizontal plate, and the support 67 is rotatably connected with the middle part of the swing plate 66.

[0039] As an implementation form, the support 67 is mainly used for ensuring the convenient rotation of the swing plate 66 around the center part, so as to realize the corresponding linkage starting and stopping actions.

[0040] Please refer to Figure 2 and Figure 3 The top rod 65 penetrates through the guide sleeve 64 and is slidably connected with the guide sleeve 64, and the guide sleeve 64 is welded with the sidewall of the liquid storage tank 5 through a self-provided rod.

[0041] As an implementation, the guide sleeve 64 is mainly used to ensure the stable lifting of the top rod 65 in the vertical direction, so as to ensure the reciprocating starting of the liquid adding delay switch 63.

[0042] Please refer to Figure 1 and Figure 2 The liquid adding delay switch 63 is electrically connected with the liquid adding pump 2, and the liquid adding pump 2 is flange-connected with the liquid adding pipe 3.

[0043] As an implementation, the liquid adding delay switch 63 is a switch that is pressed and then delayed to be turned off. After the liquid adding delay switch 63 is started under the action of the top rod 65, the liquid adding pump 2 circuit is connected and started, and after the liquid adding pump 2 is started, the viscous liquid to be transported is added into the liquid storage tank 5.

[0044] Specific working principle is that when the single screw pump body 1 is in liquid inlet, the liquid inlet pipe 4 is first installed at the liquid inlet of the single screw pump body 1, then the telescopic hose 7 is connected with the liquid suction head 61, and the liquid suction head 61 is inserted below the liquid level in the liquid storage tank 5 under the action of the floating plate 69, and then only the single screw pump body 1 needs to be started, so that the viscous liquid in the liquid storage tank 5 can be transported into the single screw pump body 1 through the liquid suction head 61, the telescopic hose 7 and the liquid inlet pipe 4. With the continuous lowering of the liquid level in the liquid storage tank 5, the floating plate 69 will drive the connecting rod 68 to move downward, and after the connecting rod 68 moves downward, the top rod 65 will move upward along the guide sleeve 64 by means of the swing plate 66, and after the top rod 65 moves upward, the liquid adding delay switch 63 will be pressed to realize the delay opening of the liquid adding pump 2, realize the automatic liquid adding of the liquid storage tank 5, and ensure that the liquid suction head 61 can always be below the liquid level in the liquid storage tank 5 during the liquid inlet process of the single screw pump body 1, so as to avoid the damage caused by air entrainment during the liquid inlet of the single screw pump body 1.

[0045] The embodiments of the specific embodiment are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A single screw pump liquid inlet anti-air intake device, characterized by: Including single screw pump body (1), one side of single screw pump body (1) is provided with liquid storage tank (5), the liquid inlet of single screw pump body (1) is installed with liquid inlet pipe (4), the liquid inlet of liquid inlet pipe (4) is connected with telescopic hose (7), the liquid storage tank (5) is installed with linkage start-stop mechanism (6) in the side of telescopic hose (7), the outer side wall of liquid storage tank (5) is installed with liquid adding pump (2) on the upper portion, the liquid outlet of liquid adding pump (2) is installed with liquid adding pipe (3), linkage start-stop mechanism (6) includes liquid pumping head (61), fixed plate (62), liquid adding delay switch (63), guide sleeve (64), top rod (65), swing plate (66), support (67), connecting rod (68), floating plate (69) and guide slide rod (610), wherein the floating plate (69) is located on the upper side of the liquid level in the liquid storage tank (5), the guide slide rod (610) has four, four guide slide rods (610) are respectively through the four corners of the floating plate (69), the liquid pumping head (61) is installed in the middle of the floating plate (69), the floating plate (69) is installed with the connecting rod (68) on one side of the top end, the connecting rod (68) is connected with the swing plate (66) on the top end, the swing plate (66) is connected with the top rod (65) away from the connecting rod (68) one end, the support (67) is installed on the lower side of the swing plate (66) on the liquid storage tank (5), the guide sleeve (64) is installed on the liquid storage tank (5) opposite the top rod (65), the fixed plate (62) is installed above the top rod (65), the liquid adding delay switch (63) is installed on the bottom end of the fixed plate (62) opposite the top rod (65).

2. A single screw pump liquid inlet anti-air intake device according to claim 1, characterized in that: The bottom end of the liquid pumping head (61) is also provided with a filter cover (8), and the middle part of the filter cover (8) is a mesh structure.

3. A single screw pump liquid inlet anti-air intake device according to claim 1, characterized in that: The liquid pumping head (61) is bonded with the floating plate (69), one end of the telescopic hose (7) is connected with the pipe clamp of the liquid pumping head (61), and the other end of the telescopic hose (7) is connected with the pipe clamp of the liquid inlet pipe (4).

4. A single screw pump liquid inlet anti-air intake device according to claim 1, characterized in that: The bottom end of the guide slide rod (610) is inserted into the liquid storage tank (5), and the guide slide rod (610) is slidingly connected with the floating plate (69).

5. A single screw pump liquid inlet air inlet prevention device according to claim 1, characterized in that: The bottom end of the connecting rod (68) is rotatably connected with the floating plate (69), and the top end of the connecting rod (68) is rotatably connected with the swing plate (66).

6. A single screw pump liquid inlet air inlet prevention device according to claim 5, characterized in that: The swing plate (66) is an H-shaped structure, and the swing plate (66) is rotatably connected with the bottom of the top rod (65).

7. A single screw pump liquid inlet air inlet prevention device according to claim 1, characterized in that: The support (67) is composed of a horizontal plate and a connecting frame installed on the horizontal plate, and the support (67) is rotatably connected with the middle of the swing plate (66).

8. A single screw pump liquid inlet air inlet prevention device according to claim 7, characterized in that: The top rod (65) penetrates through the guide sleeve (64) and is slidingly connected with the guide sleeve (64), and the guide sleeve (64) is welded with the side wall of the liquid storage tank (5) through the rod.

9. A single screw pump liquid inlet air inlet prevention device according to claim 7, characterized in that: The liquid adding delay switch (63) is electrically connected with the liquid adding pump (2), and the liquid adding pump (2) is flange-connected with the liquid adding pipe (3).

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