Pit vacuum pump

Abstract

The utility model discloses a pit vacuum pump which comprises a vacuum tank provided with a connecting pipe, the connecting pipe is provided with an inserting pipe, and a static ring is arranged in the inserting pipe in a sliding mode. A movable ring is rotationally arranged in the liquid inlet pipe; the sealing device further comprises springs which are symmetrically arranged on the static ring, and the static ring is attached to the end face of the movable ring under pushing of the springs. According to the pit vacuum pump provided by the utility model, through the arrangement of the vacuum tank, the phenomenon that the self-suction force of the pump body is insufficient is eliminated, the overall suction effect is improved, meanwhile, the air binding phenomenon and the dry grinding condition of equipment are avoided, vibration is reduced, the operation period is prolonged, and pump filling during first-time starting is realized; pumping and exhausting are not needed during each start and stop, so that time and manpower are greatly saved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid pumping, in particular to a pit vacuum pump. Background Art

[0002] There is usually a pit in the factory area, and the slurry in the pit needs to be drained out in time to avoid affecting the operation of the production system in the production area.

[0003] In the prior art, the liquid in the pit is generally pumped out by a self-priming pump, and the existing self-priming pump drives the impeller to rotate by a motor to increase the kinetic energy of the liquid and transport the liquid. However, the pit has a certain depth, and the self-priming pump is on the ground. Due to the height difference, a large kinetic energy is required to pump out the liquid. The pumping effect is not good if the impeller of the self-priming pump is used alone to increase the kinetic energy of the liquid, which often leads to the occurrence of air binding, thereby causing the pump body to run dry and damage the pump sealing components. Utility Model Content

[0004] The utility model aims to provide a pit vacuum pump, which is used to solve the technical problem that the existing self-priming pump has a poor suction effect.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pit vacuum pump, comprising:

[0006] A vacuum tank, on which a connecting pipe is arranged, on which a plug-in pipe is arranged, and inside which a static ring is slidably arranged;

[0007] A liquid inlet pipe, in which a moving ring is rotatably arranged;

[0008] It also includes springs symmetrically arranged on the stationary ring, and the stationary ring is fitted with the end surface of the dynamic ring under the push of the springs.

[0009] Preferably, the liquid inlet pipe comprises a negative pressure portion, an acceleration portion and a swirl portion, the negative pressure portion is a conical pipe section, and the cross-sectional area of ​​the negative pressure portion gradually increases from the liquid inlet to the gas outlet.

[0010] Preferably, the invention further comprises a rotating shaft rotatably arranged in the liquid inlet pipe, on which centrifugal blades are arranged in a circumferential array, and the centrifugal blades are arranged in the swirl part.

[0011] Preferably, it also includes a moving ring seat fixedly arranged on the moving ring, which is fixedly connected to the rotating shaft via a connecting rod.

[0012] Preferably, it further comprises a plurality of groups of rotor blades arranged in a linear array on the rotating shaft, and each group of rotor blades is arranged in a circular array on the rotating shaft.

[0013] Preferably, it also includes a plurality of groups of stator blades arranged in a linear array on the inner wall of the liquid inlet pipe, which are spaced apart from the plurality of groups of rotor blades, and each group of stator blades is arranged in a circular array on the inner wall of the acceleration part.

[0014] Preferably, the stator blades and the rotor blades are both arranged in a spiral shape, and the bending directions of the two are arranged opposite to each other.

[0015] In the above technical scheme, the utility model provides a pit vacuum pump with the following beneficial effects: after the pump is filled for the first time, the vacuum tank is in a negative pressure vacuum state above the liquid level, and when the pump body is suctioning, the liquid in the vacuum tank is sucked first, thereby reducing the negative pressure of the liquid in the vacuum tank and strengthening it, thereby increasing the suction strength of the water inlet of the vacuum tank, thereby eliminating the phenomenon of insufficient self-priming force of the pump body and improving the overall suction effect. Since the liquid inlet pipe of the pump body is filled with liquid in advance, the pump body changes from negative pressure water absorption to positive pressure water absorption, which can avoid the occurrence of air binding and dry grinding of equipment, reduce vibration, and extend the operation cycle. At the same time, through the arrangement of the vacuum tank, after the suction work is completed, there is still liquid in the vacuum tank, so the liquid inlet pipe of the pump body is always in The pump is filled with liquid, so there is no need to perform the pump priming operation when the next suction is performed, so that the pump can be primed when it is started for the first time, and there is no need to prime the pump and exhaust air each time it is started and stopped thereafter, which greatly saves time and manpower. The moving ring rotatably arranged at the liquid inlet of the liquid inlet pipe abuts against the static ring arranged at the port of the plug-in pipe, and pushes the static ring to squeeze the spring. When suctioning, the moving ring is rotated, and friction is generated between the moving ring and the end face of the static ring, thereby realizing mechanical sealing, and under the pushing action of the compressed and deformed spring, the moving ring and the static ring are always kept in a tightly fitted state, even if the connection gap between the liquid inlet pipe and the connecting pipe increases due to vibration, the moving ring and the static ring can always be kept in a tightly fitted state, thereby improving the sealing effect between the connecting pipe and the liquid inlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of a three-dimensional structure provided for an embodiment of the utility model

[0018] Figure 2 A schematic diagram of the three-dimensional structure of a pump body provided in an embodiment of the utility model;

[0019] Figure 3 A schematic cross-sectional view of the connection between the liquid inlet pipe and the connecting pipe provided in an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the structure of the present invention;

[0021] Figure 5 A schematic diagram of the rotor blade structure provided by an embodiment of the utility model;

[0022] Figure 6 This is a schematic diagram of the cross-sectional structure of the acceleration part provided in an embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 1. Pump body; 2. Vortex shell; 3. Liquid inlet pipe; 31. Negative pressure part; 32. Acceleration part; 321. Stator blades; 33. Swirl part; 331. Limiting ring; 332. Connecting ring; 333. Moving ring seat; 334. Moving ring; 34. First flange; 35. Rotating shaft; 351. Rotor blades; 352. Centrifugal blades; 36. Connecting rod; 4. Connecting pipe; 41. Second flange; 411. Plug-in pipe; 412. Spring; 413. Static ring; 5. Vacuum tank; 51. Water inlet; 52. Exhaust port. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1-6 As shown, a pit vacuum pump comprises:

[0027] A vacuum tank 5 is provided with a connecting pipe 4, a plug-in pipe 411 is provided on the connecting pipe 4, and a static ring 413 is slidably provided in the plug-in pipe 411;

[0028] The liquid inlet pipe 3 has a rotating ring 334 rotatably arranged therein;

[0029] It also includes a spring 412 symmetrically arranged on the stationary ring 413 , and the stationary ring 413 fits with the end surface of the dynamic ring 334 under the push of the spring 412 .

[0030] Specifically, a vortex shell 2 is provided on the pump body 1, and a vacuum tank 5 is connected in series at the liquid inlet of the pump body 1. When started for the first time, the pump is filled first, and the air pump is started first. The air pump is connected to the exhaust port 52 on the top of the vacuum tank 5, and suction is performed through the exhaust port 52 on the top of the vacuum tank 5, so that the liquid is introduced into the vacuum tank 5 and the vacuum tank 5 is filled. After filling, the pump body 1 is started, and the liquid in the vacuum tank 5 is sucked through the connecting pipe 4 and the liquid inlet pipe 3. The water level in the vacuum tank 5 gradually decreases, so that the air pressure in the vacuum tank 5 gradually decreases to form a negative pressure, and the liquid gradually rises through the water suction pipe connected to the drain port on the vortex shell 2 until the water suction pipe is completely filled with liquid, and then the water suction system enters the operating state. As the running time continues, the air in the vacuum tank 5 is brought out of the tank by water in the form of bubbles, and reaches a normal operating state.

[0031] Furthermore, the design volume of the vacuum tank 5 is 310L, the pipeline volume is 70L, and the volume ratio of the vacuum tank 5 to the liquid inlet pipe 3 is 4.5:1, which meets the operation requirements. After the first pump filling, the process personnel must confirm that the liquid level in the vacuum tank 5 must not be lower than the pump inlet to ensure the authenticity of the liquid level and eliminate the influence of foam on the liquid level indication. After the first pump filling, the liquid level in the vacuum tank 5 is in a negative pressure vacuum state. When the pump body 1 is sucking, the liquid in the vacuum tank 5 is sucked first, so that the liquid in the vacuum tank 5 is reduced and the negative pressure is strengthened, thereby increasing the suction strength of the water inlet 51 of the vacuum tank 5, thereby eliminating the phenomenon of insufficient self-priming force of the pump body 1 and improving the overall suction effect.

[0032] Since the liquid inlet pipe 3 of the pump body 1 is pre-filled with liquid, the pump body 1 changes from negative pressure water absorption to positive pressure water absorption, which can avoid the occurrence of air binding and dry grinding of equipment, reduce vibration, and extend the operation cycle. At the same time, after the suction work is completed, the vacuum tank 5 is set, there is still liquid in the vacuum tank 5, so the liquid inlet pipe 3 of the pump body 1 is always in a state of being filled with liquid. Therefore, when the next suction is performed, there is no need to perform the pump priming operation, thereby realizing the pump priming at the first start, and there is no need to prime the pump and exhaust air each time it is started and stopped thereafter, which greatly saves time and manpower.

[0033] Furthermore, when connecting the liquid inlet pipe 3 and the connecting pipe 4, first insert the plug tube 411 on the connecting pipe 4 into the liquid inlet port of the liquid inlet pipe 3, and make the second flange 41 on the connecting pipe 4 fit tightly with the first flange 34 on the liquid inlet pipe 3, and make the screw holes opened on the first flange 34 and the second flange 41 correspond to each other, and then fix them with fixing bolts to complete the connection.

[0034] Furthermore, when the plug-in tube 411 is inserted into the liquid inlet pipe 3, the dynamic ring 334 rotatably arranged at the liquid inlet port of the liquid inlet pipe 3 abuts against the static ring 413 arranged at the end of the plug-in tube 411, and pushes the static ring 413 to squeeze the spring 412. During suction, the dynamic ring 334 is rotated, and friction is generated by the rotation of the dynamic ring 334 and the end surface of the static ring 413, thereby realizing mechanical sealing. Under the pushing action of the compressed and deformed spring 412, the dynamic ring 334 and the static ring 413 are always kept in a tightly fitted state, thereby improving the sealing effect between the connecting tube 4 and the liquid inlet pipe 3.

[0035] Since the stationary ring 413 is slidably arranged in the plug-in tube 411, when the moving ring 334 rotates, the stationary ring 413 will be driven to rotate due to friction. Therefore, in order to prevent the stationary ring 413 from rotating with the moving ring 334, the stationary ring 413 cooperates with the keyway of the plug-in tube 411 to ensure that it only slides in the axial direction and does not rotate.

[0036] In the above technology, after the first filling of the pump, the liquid level in the vacuum tank 5 is in a negative pressure vacuum state. When the pump body 1 is pumping, the liquid in the vacuum tank 5 is first sucked, so that the liquid in the vacuum tank 5 is reduced and the negative pressure is strengthened, thereby improving the suction strength of the water inlet 51 of the vacuum tank 5, thereby eliminating the phenomenon of insufficient self-priming force of the pump body 1 and improving the overall suction effect. Since the liquid inlet pipe 3 of the pump body 1 is pre-filled with liquid, the pump body 1 changes from negative pressure water absorption to positive pressure water absorption, which can avoid the occurrence of air binding and dry grinding of equipment, reduce vibration, and extend the operation cycle. At the same time, after the suction work is completed by the set vacuum tank 5, there is still liquid in the vacuum tank 5, so the liquid inlet pipe 3 of the pump body 1 is always in a state of being filled with liquid, so when the next suction is performed, there is no need to perform the pump filling operation. Thereby, the pump can be primed when it is started for the first time, and there is no need to prime and exhaust the pump each time it is started and stopped thereafter, which greatly saves time and manpower. The movable ring 334 rotatably arranged at the liquid inlet of the liquid inlet pipe 3 abuts against the static ring 413 arranged at the end of the plug-in pipe 411, and pushes the static ring 413 to squeeze the spring 412. During suction, the movable ring 334 is rotated, and friction is generated by the rotation of the movable ring 334 and the end surface of the static ring 413, thereby achieving mechanical sealing, and under the pushing action of the compressed and deformed spring 412, the movable ring 334 and the static ring 413 are always kept in a tightly fitted state, even if the connection gap between the liquid inlet pipe 3 and the connecting pipe 4 increases due to vibration, the movable ring 334 and the static ring 413 can always maintain a tightly fitted state, thereby improving the sealing effect between the connecting pipe 4 and the liquid inlet pipe 3.

[0037] As a further embodiment of the present invention, the liquid inlet pipe 3 includes a negative pressure portion 31, an acceleration portion 32 and a swirl portion 33. The negative pressure portion 31 is a conical pipe section, and the cross-sectional area of ​​the negative pressure portion 31 gradually increases from the liquid inlet to the gas outlet.

[0038] Specifically, it also includes a rotating shaft 35 rotatably arranged in the liquid inlet pipe 3, on which centrifugal blades 352 are arranged in a circumferential array, and the centrifugal blades 352 are arranged in the swirl part 33. During suction, the liquid enters the liquid inlet pipe 3 through the connecting pipe 4 and flows to the centrifugal blades 352. Since the centrifugal blades 352 are in a circumferential array and spirally arranged on the rotating shaft 35, when the liquid flows to the centrifugal blades 352, the rotating shaft 35 is driven to rotate by the centrifugal blades 352, so that the liquid quickly passes through the liquid inlet pipe 3 and enters the vortex shell 2 under the push of the centrifugal blades 352, thereby improving the liquid suction efficiency.

[0039] As a further embodiment provided by the present invention, a moving ring seat 333 is further provided on the moving ring 334 , and is fixedly connected to the rotating shaft 35 via a connecting rod 36 .

[0040] Specifically, during suction, the liquid enters the liquid inlet pipe 3 through the connecting pipe 4 and flows to the centrifugal blades 352. Since the centrifugal blades 352 are in a circular array and are spirally arranged on the rotating shaft 35, when the liquid flows to the centrifugal blades 352, the rotating shaft 35 is driven to rotate by the centrifugal blades 352. The rotating shaft 35 rotates, thereby driving the moving ring seat 333 to rotate through the connecting rod 36, thereby driving the moving ring 334 to rotate through the moving ring seat 333 and generating friction with the end face of the static ring 413, thereby realizing mechanical sealing. No additional driving source is required to drive the moving ring 334 to rotate, thereby simplifying the structure and saving costs.

[0041] A limit ring 331 is rotatably arranged inside the wall of the liquid inlet pipe 3 , and the limit ring 331 is connected to the movable ring seat 333 via a connecting ring 332 , so that the movable ring 334 can be rotatably arranged inside the liquid inlet pipe 3 .

[0042] As a further embodiment provided by the present invention, it also includes a plurality of groups of rotor blades 351 arranged in a linear array on the rotating shaft 35 , and each group of rotor blades 351 is arranged in a circular array on the rotating shaft 35 .

[0043] Specifically, it also includes a plurality of groups of stator blades 321 arranged in a linear array on the inner wall of the liquid inlet pipe 3, which are arranged at intervals with a plurality of groups of rotor blades 351, and each group of stator blades 321 is arranged in a circumferential array on the inner wall of the acceleration part 32. The stator blades 321 and the rotor blades 351 are both arranged in a spiral bending shape, and the bending directions of the two are arranged oppositely. When the rotating shaft 35 rotates, the rotor blades 351 are driven to rotate. Since the rotor blades 351 are arranged in a spiral bending shape, when the rotor blades 351 rotate, the plurality of groups of rotor blades 351 further pressurize the liquid step by step, thereby further accelerating the flow speed of the liquid, thereby improving the pumping efficiency.

[0044] Furthermore, since the multiple groups of stator blades 321 and the multiple groups of rotor blades 351 on the inner wall of the liquid inlet pipe 3 are arranged at intervals, when the liquid enters the liquid inlet pipe 3, it first passes through the centrifugal blades 352 in the swirl portion 33 to form a swirl and flows into the acceleration portion 32. After entering the acceleration portion 32, it is pressurized step by step by the rotor blades 351. Since the acceleration portion 32 is also provided with stator blades 321, the stator blades 321 and the rotor blades 351 are arranged at intervals and their bending directions are arranged oppositely. When the liquid enters the acceleration portion 32, it is pressurized by the rotor blades 351 and then The stator blades 321 prevent the generation of swirl, so that the liquid forms a high-speed jet in the acceleration part 32 and flows to the negative pressure part 31. Since the negative pressure part 31 is a conical pipe section, the cross-sectional area of ​​the negative pressure part 31 gradually increases from the liquid inlet to the air outlet. When the high-speed jet enters the negative pressure part 31, it is sprayed into the negative pressure part 31 through the liquid inlet of the conical pipe section. According to Bernoulli's theorem, the greater the flow rate, the smaller the air pressure in the area. Therefore, a low-pressure area is formed around the liquid inlet of the conical pipe section, thereby forming a negative pressure in the negative pressure part 31, thereby improving the overall suction effect.

[0045] Since the rotating shaft 35 may vibrate under high-speed liquid, a support frame is provided at one end of the rotating shaft 35 away from the centrifugal blades 352 to support the rotating shaft 35, thereby ensuring the stability of the rotation of the rotating shaft 35.

[0046] Working principle: The pump body 1 is provided with a vortex shell 2. When pumping liquid, the pump body 1 is started and negative pressure is generated in the vortex shell 2, and air is pumped through the liquid inlet pipe 3 installed on the vortex shell 2 and the connecting pipe 4 connected to the liquid inlet pipe 3. When the plug-in tube 411 is inserted into the liquid inlet pipe 3, the dynamic ring 334 rotatably arranged at the liquid inlet of the liquid inlet pipe 3 abuts against the static ring 413 arranged at the end of the plug-in tube 411, and pushes the static ring 413 to squeeze the spring 412. When pumping, the liquid enters the liquid inlet pipe 3 through the connecting tube 4. The centrifugal blades 352 are arranged in a circular array and are spirally arranged on the rotating shaft 35. When the liquid flows to the centrifugal blades 352, the rotating shaft 35 is driven to rotate by the centrifugal blades 352. The rotating shaft 35 rotates, thereby driving the dynamic ring seat 333 to rotate through the connecting rod 36, thereby driving the dynamic ring 334 to rotate through the dynamic ring seat 333 and generating friction with the end surface of the static ring 413, thereby realizing mechanical sealing. When the rotating shaft 35 rotates, the rotor blades 351 are driven to rotate. When the liquid enters the liquid inlet pipe 3, it first passes through the centrifugal blades 352 in the swirl part 33 to form a swirl and flows into the acceleration part 32. After entering the acceleration part 32, it is pressurized step by step by the rotor blades 351. Since the acceleration part 32 is also provided with stator blades 321, the stator blades 321 and the rotor blades 351 are arranged at intervals and their bending directions are opposite. When the liquid enters the acceleration part 32, it is pressurized by the rotor blades 351, and then passes through the stator blades 321 to prevent the generation of swirl, thereby making the liquid The liquid body forms a high-speed jet in the acceleration section 32 and flows toward the negative pressure section 31. Since the negative pressure section 31 is a tapered pipe section, the cross-sectional area of ​​the negative pressure section 31 gradually increases from the liquid inlet to the air outlet. When the high-speed jet enters the negative pressure section 31, it is sprayed into the negative pressure section 31 through the liquid inlet of the tapered pipe section. According to Bernoulli's theorem, the greater the flow rate, the smaller the air pressure in the area. Therefore, a low-pressure area is formed around the liquid inlet of the tapered pipe section, thereby forming a negative pressure in the negative pressure section 31, thereby improving the overall suction effect.

[0047] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pit vacuum pump, characterized in that: include: A vacuum tank (5) is provided with a connecting pipe (4), the connecting pipe (4) is provided with a plug-in pipe (411), and a stationary ring (413) is slidably provided inside the plug-in pipe (411); A liquid inlet pipe (3), in which a moving ring (334) is rotatably arranged; It also includes a spring (412) symmetrically arranged on the static ring (413), and the static ring (413) is in contact with the end surface of the dynamic ring (334) under the push of the spring (412).

2. A pit vacuum pump according to claim 1, characterized in that: The liquid inlet pipe (3) comprises a negative pressure portion (31), an acceleration portion (32) and a swirl portion (33); the negative pressure portion (31) is a conical pipe section; and the cross-sectional area of ​​the negative pressure portion (31) gradually increases from the liquid inlet to the gas outlet.

3. A pit vacuum pump according to claim 1, characterized in that: It also comprises a rotating shaft (35) rotatably arranged in the liquid inlet pipe (3), on which centrifugal blades (352) are arranged in a circumferential array, and the centrifugal blades (352) are arranged in the swirl part (33).

4. A pit vacuum pump according to claim 1, characterized in that: It also includes a moving ring seat (333) fixedly arranged on the moving ring (334), which is fixedly connected to the rotating shaft (35) via a connecting rod (36).

5. A pit vacuum pump according to claim 1, characterized in that: It also includes a plurality of groups of rotor blades (351) arranged in a linear array on the rotating shaft (35), and each group of rotor blades (351) is arranged in a circular array on the rotating shaft (35).

6. A pit vacuum pump according to claim 1, characterized in that: It also includes a plurality of groups of stator blades (321) arranged in a linear array on the inner wall of the liquid inlet pipe (3), which are arranged at intervals from the plurality of groups of rotor blades (351), and each group of the stator blades (321) is arranged in a circular array on the inner wall of the acceleration part (32).

7. A pit vacuum pump according to claim 6, characterized in that: The stator blades (321) and the rotor blades (351) are both arranged in a spirally curved shape, and the bending directions of the two are arranged opposite to each other.

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