Vertical self-priming condensate pump

Abstract

The utility model discloses a vertical self-priming condensate pump, including pump body, impeller, pump shaft, pump shaft drive piece and pump chamber subassembly, the pump body is provided in the pump chamber subassembly, the impeller is installed at the lower end of the pump shaft and is located in the pump body, the pump shaft drive piece is connected with the upper end of the pump shaft, and the pump shaft drive piece is connected with the pump chamber subassembly. The pump cavity assembly is provided with a self-suction tank, a suction flow channel and a liquid outlet, the self-suction tank is provided with a liquid inlet, the self-suction tank is communicated with the pump body through the suction flow channel, and the pump body is communicated with the liquid outlet. According to the vertical type self-suction condensate pump, the self-suction pump principle and the condensate pump principle are organically combined, and the vertical type self-suction pump structure and the vertical type condensate pump structure are organically combined, so that the vertical type self-suction condensate pump has the advantages of being low in net positive suction head and high in suction head and has the self-suction function.

Description

Technical Field

[0001] The utility model belongs to the field of centrifugal pumps, and particularly relates to a vertical self-priming condensate pump, which is applicable to sucking liquids under negative pressure conditions and liquids under large suction lift conditions. Background Art

[0002] Traditional widely used pump types include self-priming pumps and condensate pumps, which can be further divided into vertical pumps and horizontal pumps according to the layout form. The working principles of traditional horizontal and vertical self-priming pumps are gas-liquid mixed transportation methods, with self-priming functions. Only one-time priming liquid needs to be filled before starting the machine, and subsequent startup and operation do not require refilling the priming liquid. However, traditional self-priming pumps do not have a low net positive suction head (NPSH) value and cannot meet the requirements of sucking liquids under negative pressure conditions and liquids under large suction lift conditions. In recent years, the developed vertical self-priming and self-controlled pumps adopt open impellers and additional auxiliary impeller sealing forms. Their disadvantages are low suction lift, low efficiency, and air leakage into the pump due to poor sealing, resulting in a long time for sucking water and even inability to suck water in severe cases. The working principles of traditional horizontal and vertical condensate pumps are to transport liquids under negative pressure through the pump, with a low NPSH value but without self-priming functions. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a vertical self-priming condensate pump that combines the working principles of self-priming pumps and condensate pumps, which is beneficial to reducing the NPSH of the pump and increasing the suction lift.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A vertical self-priming condensate pump includes a pump body, an impeller, a pump shaft, a pump shaft driving member, and a pump chamber assembly. The pump body is arranged inside the pump chamber assembly. The impeller is installed at the lower end of the pump shaft and located inside the pump body. The pump shaft driving member is connected to the upper end of the pump shaft. The pump chamber assembly is provided with a self-priming tank, a suction flow channel, and a liquid outlet. The self-priming tank is provided with a liquid inlet. The self-priming tank is communicated with the pump body through the suction flow channel. The pump body is communicated with the liquid outlet.

[0006] As a further improvement of the above technical solution: The suction flow channel includes an upper suction flow channel and a lower suction flow channel. The impeller is provided with an upper impeller flow channel communicated with the upper suction flow channel and a lower impeller flow channel communicated with the lower suction flow channel.

[0007] As a further improvement of the above technical solution: An inducer and a reverse inducer are arranged on the pump shaft. The inducer is located below the impeller, and the reverse inducer is located above the impeller.

[0008] As a further improvement of the above technical solution: The liquid inlet is equipped with a check valve.

[0009] As a further improvement of the above technical solution: the height of the liquid inlet is greater than the height of the lower suction channel and not less than the height of the upper suction channel.

[0010] As a further improvement of the above technical solution: a sealing cavity is provided in the pump chamber assembly, and a mechanical seal is provided between the sealing cavity and the pump shaft.

[0011] As a further improvement of the above technical solution: a secondary impeller cavity is provided below the mechanical seal, a secondary impeller is installed on the pump shaft, and the secondary impeller is located in the secondary impeller cavity to push the liquid out of the secondary impeller cavity.

[0012] As a further improvement of the above technical solution: the sealing cavity is connected with an oil seal pipe, and one end of the oil seal pipe extends outside the pump chamber assembly and is installed with an oil level gauge.

[0013] As a further improvement of the above technical solution: the secondary impeller cavity is connected with a vent pipe, and one end of the vent pipe extends to the liquid outlet.

[0014] As a further improvement of the above technical solution: the pump chamber assembly includes an upper pump chamber and a lower pump chamber detachably connected to the upper pump chamber, the pump body includes an upper pump body and a lower pump body hermetically butted with the upper pump body, the upper pump body is connected with the upper pump chamber, and the lower pump body is detachably connected with the lower pump chamber.

[0015] Compared with the prior art, the advantages of the present utility model are as follows: for the vertical self-priming condensate pump disclosed by the present utility model, before starting, the pump is first primed into the self-priming tank through the liquid inlet, and then the pump shaft driving member is started to drive the pump shaft to rotate, the pump shaft drives the impeller at the lower end to rotate, and the liquid sequentially passes through the self-priming tank, the suction channel, the internal flow channel of the impeller and the pump body and finally is discharged from the liquid outlet. This vertical self-priming condensate pump organically combines the principles of self-priming pumps and condensate pumps, and organically combines the structures of vertical self-priming pumps and vertical condensate pumps, thus having the characteristics of low NPSH and high suction lift, and having a self-priming function.

[0016] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the vertical self-priming condensate pump of the present utility model.

[0018] Figure 2 is Figure 1 a partial enlarged view of

[0019] Each label in the figure represents:

[0020] 1. Pump body; 11. Upper pump body; 12. Lower pump body; 2. Impeller; 21. Upper impeller flow passage; 22. Lower impeller flow passage; 3. Pump shaft; 4. Pump shaft drive; 5. Pump chamber assembly; 51. Self-priming tank; 52. Upper suction flow passage; 53. Lower suction flow passage; 54. Liquid outlet; 55. Liquid inlet; 56. Check valve; 57. Upper pump chamber; 58. Lower pump chamber; 6. Seal chamber; 61. Mechanical seal; 62. Secondary impeller chamber; 63. Secondary impeller; 64. Oil seal pipe; 65. Oil level gauge; 66. Exhaust pipe; 71. Inducer; 72. Reverse inducer. Detailed implementation mode

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "plurality" is two or more unless otherwise specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "assembled", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0025] Figures 1 to 2An embodiment of the vertical self-priming condensate pump of the present utility model is shown. The vertical self-priming condensate pump of this embodiment includes a pump body 1, an impeller 2, a pump shaft 3, a pump shaft driving member 4, and a pump chamber assembly 5. The pump body 1 is arranged in the pump chamber assembly 5. The impeller 2 is installed at the lower end of the pump shaft 3 and is located within the pump body 1. The pump shaft driving member 4 is connected to the upper end of the pump shaft 3. The pump chamber assembly 5 is provided with a self-priming tank 51, a suction flow passage, and a liquid outlet 54. The self-priming tank 51 is provided with a liquid inlet 55. The self-priming tank 51 is communicated with the pump body 1 through the suction flow passage, and the pump body 1 is communicated with the liquid outlet 54.

[0026] For the vertical self-priming condensate pump of this embodiment, before starting, first fill the self-priming tank 51 with liquid through the liquid inlet 55, and then start the pump shaft driving member 4 to drive the pump shaft 3 to rotate. The pump shaft 3 then drives the impeller 2 at the lower end to rotate. The liquid sequentially passes through the self-priming tank 51, the suction flow passage, the internal flow passage of the impeller 2, and the pump body 1 and finally discharges from the liquid outlet 54. The vertical self-priming condensate pump of this embodiment organically combines the self-priming pump principle and the condensate pump principle, and organically combines the vertical self-priming pump structure and the vertical condensate pump structure, so as to have the characteristics of low net positive suction head and high suction lift, and has a self-priming function. Preferably, the pump shaft driving member 4 adopts a low-speed motor (for example, the rotational speed is 500 - 1500 r / min), so that the net positive suction head value is smaller when the pump operates at a low speed, or it can also be a variable-frequency motor that can adjust the rotational speed.

[0027] Furthermore, in this embodiment, the suction flow passage includes an upper suction flow passage 52 and a lower suction flow passage 53. The impeller 2 is provided with an upper impeller flow passage 21 communicated with the upper suction flow passage 52 and a lower impeller flow passage 22 communicated with the lower suction flow passage 53. The cooperation between the upper suction flow passage 52 and the upper impeller flow passage 21, and the cooperation between the lower suction flow passage 53 and the lower impeller flow passage 22 can form a vertical self-priming condensate pump with a double-suction double-flow passage structure. For the impeller 2 with a double-suction double-flow passage structure, the turbulence of the fluid during the flow process from the suction port to the outlet of the impeller 2 is small, the flow becomes smoother, the hydraulic volume loss is reduced, the hydraulic efficiency is improved, the required net positive suction head is small, which is beneficial to reducing the net positive suction head of the pump and increasing the suction lift; in addition, it can reduce the pulse, creating conditions for reducing the vibration of the impeller 2.

[0028] Furthermore, in this embodiment, an inducer 71 and a reverse inducer 72 are arranged on the pump shaft 3. The inducer 71 is located below the impeller 2, and the reverse inducer 72 is located above the impeller 2. The inducer 71 and the reverse inducer 72 are used to boost the pressure at the suction port of the impeller 2, further making the pressure at the inlet of the impeller 2 greater than the liquid saturated vapor pressure, playing a role in further reducing the net positive suction head value of the pump and increasing the suction height of the pump.

[0029] Further, in this embodiment, a one-way valve 56 is provided at the liquid inlet 55. The one-way valve 56 is in an open state during the start-up and operation of the pump to allow the liquid to pass through. When the pump stops, the one-way valve 56 closes to prevent the liquid from passing through, so as to store sufficient liquid in the pump chamber assembly 5. The pump can be started without priming again the next time it is started, overcoming the defects that the solenoid valves installed in traditional self-priming pumps are prone to failure and unreliable, eliminating the phenomenon that there is no liquid in the pump chamber assembly 5 due to siphonage, and truly achieving the purpose of "only need to prime once".

[0030] As a preferred embodiment, the height of the liquid inlet 55 is greater than the height of the lower suction passage 53 and not less than the height of the upper suction passage 52, which is beneficial to storing sufficient liquid in the pump chamber assembly 5, and the pump can be started without priming again the next time it is started.

[0031] For specific reference Figure 2 , in this embodiment, a sealing cavity 6 is provided in the pump chamber assembly 5, and a mechanical seal 61 is provided between the sealing cavity 6 and the pump shaft 3. The mechanical seal 61 has the functions of blocking air from entering the pump and preventing the liquid in the pump from leaking out, thereby ensuring a fast water suction speed and a short time period in the vacuum state inside the pump. Preferably, the mechanical seal 61 is a double-ended mechanical seal.

[0032] Further, in this embodiment, a secondary impeller cavity 62 is provided below the mechanical seal 61, and a secondary impeller 63 is installed on the pump shaft 3. The secondary impeller 63 is located in the secondary impeller cavity 62 to push the liquid out of the secondary impeller cavity 62. The secondary impeller 63 is installed in the secondary impeller cavity 62. When the secondary impeller 63 rotates with the pump shaft 3, it reversely pushes the liquid out of the secondary impeller cavity 62, making the pressure in the sealing cavity 6 above the secondary impeller cavity 62 lower, which is beneficial to ensuring the sealing effect of the mechanical seal 61; at the same time, the secondary impeller 63 also has the function of pushing the particles in the liquid out of the secondary impeller cavity 62 to prevent the particles from entering the sealing cavity 6. The above measures make the seal of the pump shaft 3 reliable and have a long service life.

[0033] Further, in this embodiment, the sealing cavity 6 is connected with an oil seal pipe 64, and one end of the oil seal pipe 64 extends outside the pump chamber assembly 5 and is provided with an oil level gauge 65. The oil level gauge 65 can be used to measure the oil level in the sealing cavity 6 on the one hand, and can be used as a filling port on the other hand, so as to add thin oil into the sealing cavity 6 to immerse the mechanical seal 61 in the thin oil. The thin oil lubricates and dissipates heat for the mechanical seal 61.

[0034] Further, in this embodiment, the secondary impeller cavity 62 is connected with an exhaust pipe 66, and one end of the exhaust pipe 66 extends to the liquid outlet 54. When priming for the first time, the air in the pump chamber assembly 5 flows upward and is discharged to the pump liquid outlet 54 through the exhaust pipe 66, so as to form a vacuum state in the pump chamber assembly 5.

[0035] Furthermore, in this embodiment, the pump chamber assembly 5 includes an upper pump chamber 57 and a lower pump chamber 58 detachably connected to the upper pump chamber 57 (for example, detachably connected by fasteners such as bolts and screws, with reliable connection and convenient disassembly and assembly). The pump body 1 includes an upper pump body 11 and a lower pump body 12 hermetically docked with the upper pump body 11. The upper pump body 11 is connected to the upper pump chamber 57, and the lower pump body 12 is detachably connected to the lower pump chamber 58 (for example, detachably connected by fasteners such as bolts and screws, with reliable connection and convenient disassembly and assembly), which is convenient for disassembling, assembling and maintaining the pump.

[0036] The working process of the vertical self-priming condensate pump of the present utility model is as follows:

[0037] Before the first start-up, first pour water into the self-priming tank 51 and the pump chamber assembly 5 through the liquid inlet 55. The air in the pump chamber assembly 5 flows upward and is discharged to the pump liquid outlet 54 through the exhaust pipe 66, so as to form a vacuum state in the pump chamber assembly 5. Then the pump shaft driving member 4 is started to drive the pump shaft 3 to rotate, and the pump shaft 3 drives the impeller 2 at the lower end to rotate. The liquid respectively enters the upper impeller flow channel 21 and the lower impeller flow channel 22 of the impeller 2 after being pressurized by the reverse inducer 72 and the inducer 71 through the upper suction flow channel 52 and the lower suction flow channel 53, and enters the pump body 1 under the action of the rotating impeller 2, and finally flows out from the liquid outlet 54. When the auxiliary impeller 63 rotates with the pump shaft 3, it reversely pushes the liquid out of the auxiliary impeller chamber 62. At the same time, the auxiliary impeller 63 can also push the particles in the liquid out of the auxiliary impeller chamber 62 to prevent the particles from entering the sealing chamber 6. After the pump stops, the check valve 56 closes to prevent the liquid from passing through, so as to store sufficient liquid in the pump chamber assembly 5, and the pump can be started without priming the pump again next time.

[0038] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the above-disclosed technical content, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model without departing from the technical solution of the present utility model shall fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A vertical self-priming condensate pump, characterized in that: It includes a pump body (1), an impeller (2), a pump shaft (3), a pump shaft driving member (4) and a pump chamber assembly (5). The pump body (1) is arranged inside the pump chamber assembly (5). The impeller (2) is installed at the lower end of the pump shaft (3) and is located inside the pump body (1). The pump shaft driving member (4) is connected to the upper end of the pump shaft (3). The pump chamber assembly (5) is provided with a self-priming tank (51), a suction flow passage and a liquid outlet (54). The self-priming tank (51) is provided with a liquid inlet (55). The self-priming tank (51) is communicated with the pump body (1) through the suction flow passage. The pump body (1) is communicated with the liquid outlet (54).

2. The vertical self-priming condensate pump according to claim 1, wherein: The suction flow passage includes an upper suction flow passage (52) and a lower suction flow passage (53). The impeller (2) is provided with an upper impeller flow passage (21) communicated with the upper suction flow passage (52) and a lower impeller flow passage (22) communicated with the lower suction flow passage (53).

3. The vertical self-priming condensate pump according to claim 2, characterized in that: An inducer (71) and a reverse inducer (72) are arranged on the pump shaft (3). The inducer (71) is located below the impeller (2), and the reverse inducer (72) is located above the impeller (2).

4. The vertical self-priming condensate pump according to claim 2, characterized in that: The liquid inlet (55) is equipped with a check valve (56).

5. The vertical self-priming condensate pump according to claim 4, wherein: The height of the liquid inlet (55) is greater than the height of the lower suction flow passage (53) and not less than the height of the upper suction flow passage (52).

6. The vertical self-priming condensate pump according to any one of claims 1 to 5, characterized in that: A sealing chamber (6) is arranged inside the pump chamber assembly (5). A mechanical seal (61) is arranged between the sealing chamber (6) and the pump shaft (3).

7. The vertical self-priming condensate pump according to claim 6, characterized in that: A secondary impeller chamber (62) is arranged below the mechanical seal (61). A secondary impeller (63) is installed on the pump shaft (3). The secondary impeller (63) is located inside the secondary impeller chamber (62) to push the liquid out of the secondary impeller chamber (62).

8. The vertical self-priming condensate pump according to claim 6, characterized in that: The sealing chamber (6) is connected with an oil seal pipe (64). One end of the oil seal pipe (64) extends outside the pump chamber assembly (5) and is installed with an oil level gauge (65).

9. The vertical self-priming condensate pump according to claim 7, wherein: The secondary impeller chamber (62) is connected with a vent pipe (66). One end of the vent pipe (66) extends to the liquid outlet (54).

10. The vertical self-priming condensate pump according to any one of claims 1 to 5, characterized in that: The pump chamber assembly (5) includes an upper pump chamber (57) and a lower pump chamber (58) detachably connected to the upper pump chamber (57). The pump body (1) includes an upper pump body (11) and a lower pump body (12) hermetically docked with the upper pump body (11). The upper pump body (11) is connected with the upper pump chamber (57). The lower pump body (12) is detachably connected to the lower pump chamber (58).

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