A sewage pump cylinder structure

Abstract

This utility model provides a sewage pump cylinder structure, belonging to the field of water pump technology. It solves the problem of existing sewage pumps affecting motor life. In this utility model, the sewage pump includes a pump body and a bearing housing. A rotor shaft is vertically inserted into the bearing housing. The cylinder structure includes a cavity formed between the bearing housing and the pump body. A retaining ring is horizontally fixed in the cavity, dividing the cavity into an upper and lower distributed oil chamber and a pressure relief chamber. The part of the rotor shaft in the oil chamber is fitted with an upper mechanical seal. The top of the pump body has a through hole that connects the cavity to the inner cavity of the pump body. The lower end of the rotor shaft extends into the inner cavity of the pump body through the through hole. A lower mechanical seal is also fitted on the rotor shaft. The lower mechanical seal includes a stationary ring and a rotating ring fixed on the rotor shaft. An integrally formed annular sealing seat extends upward from the through hole of the pump body. The sealing seat is fitted outside the rotor shaft, and the lower mechanical seal is located inside the pump body. The stationary ring is located inside the sealing seat. A water outlet penetrates through the side wall of the pressure relief chamber. This sewage pump cylinder structure can extend the motor life.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology and relates to a sewage pump. Background Technology

[0002] Sewage pumps are pumps specifically designed to transport sewage, wastewater, or similar liquids containing solid particles, fibers, sludge, and other impurities.

[0003] An existing sewage pump structure, such as the submersible sewage pump disclosed in the Chinese Patent Database (application number: 201511029460.8), includes a base, impeller, lower mechanical seal, impeller gasket, pump body, oil chamber sealing cover, upper mechanical seal, lower bearing assembly, motor housing, rotor shaft, upper bearing, upper cover, signal cable sheath, signal cable clamp, signal cable cover, cable, cable sheath, cable cover, cable clamping plate, bearing seat, stator, rotor, oil-water probe, oil chamber housing, and pump cover; the base is fixedly mounted on the pump by screws. On the bottom surface of the pump body, the impeller is keyed onto the rotor shaft and close to the bottom surface of the rotor shaft. The impeller is located within the pump body. The impeller gasket is fixedly mounted on the bottom surface of the rotor shaft with screws, and the top surface of the impeller gasket rests against the bottom surface of the impeller. The pump cover is fixedly mounted on the top surface of the pump body with screws. The bottom surface of the oil chamber housing is fixedly mounted on the pump cover. A lower mechanical seal is installed between the rotor shaft and the center hole of the pump cover. The oil chamber sealing cover is fixedly mounted inside the oil chamber housing with screws. The upper mechanical seal is mounted on the rotor shaft and... Located between the central groove on the top surface of the oil chamber sealing cover and the central groove inside the oil chamber housing, the inner ring of the lower bearing assembly is mounted on the rotor shaft, the outer ring of the lower bearing assembly is mounted in the central hole of the oil chamber housing, the oil-water probe is mounted inside the oil chamber housing, the bottom surface of the motor housing is fixedly mounted on the top surface of the oil chamber housing with screws, the rotor is fixedly mounted on the rotor shaft, the stator is fixedly mounted on the inner wall of the motor housing, the bearing seat is fixedly mounted on the top surface of the motor housing with screws, the inner ring of the upper bearing is mounted on the rotor shaft and close to the top surface of the rotor shaft, the outer ring of the upper bearing is mounted in the central hole of the bearing seat, the upper cover is fixedly mounted on the top surface of the bearing seat with screws, the signal line sheath is mounted in the left mounting hole of the upper cover, the signal line pressure cap is fixedly mounted on the top surface of the upper cover with screws, the signal line clamp is mounted on the outer cylindrical surface of the signal line sheath, the cable sheath is mounted on the cable, the cable sheath is mounted in the right mounting hole of the upper cover, the cable pressure cap is mounted on the top surface of the upper cover with screws, and the cable clamping piece is mounted on the outer cylindrical surface of the cable sheath.

[0004] In actual use, the lower mechanical seal is in direct contact with sewage and is very easy to be damaged. Once the lower mechanical seal is damaged, the high-pressure fluid in the pump body will pass through the lower mechanical seal and impact the upper mechanical seal, eventually causing water to enter and damage the motor. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a sewage pump cylinder structure that can extend the life of the motor.

[0006] The objective of this utility model can be achieved through the following technical solution: a sewage pump cylinder structure, the sewage pump including a pump body and a bearing seat fixed on the pump body, a rotor shaft vertically inserted in the bearing seat, the cylinder structure including a cavity formed between the bearing seat and the pump body, a retaining ring horizontally fixed in the cavity dividing the cavity into an upper and lower distributed oil cavity and a pressure relief cavity, the retaining ring being sleeved on the rotor shaft, and an upper mechanical seal being fitted on the part of the rotor shaft in the oil cavity, a through hole being provided at the top of the pump body to connect the cavity to the inner cavity of the pump body, and the lower end of the rotor shaft extending into the inner cavity of the pump body through the through hole, a lower mechanical seal being fitted on the rotor shaft, the lower mechanical seal including a stationary ring and a rotating ring fixed on the rotor shaft, characterized in that, a sealing seat integrally formed into an annular shape extending upward from the position of the through hole of the pump body, and the axial cross section of the sealing seat is inverted L-shaped; the sealing seat is sleeved on the outside of the rotor shaft, and the upper end of the sealing seat and the rotor shaft are clearance-fitted; the lower mechanical seal is located in the pump body, and the stationary ring is set in the sealing seat; a water outlet is penetrated through the side wall of the pressure relief cavity.

[0007] When the sewage pump is submerged in water, water enters through the inlet and fills the pressure relief chamber. When the lower mechanical seal is damaged, the high-pressure water in the pump body is sprayed into the pressure relief chamber through the lower mechanical seal. The pressure is reduced by the water in the pressure relief chamber, which effectively prevents the high-pressure water from impacting the upper mechanical seal and flowing to the motor. This effectively prevents water from entering the motor and extends the motor's life.

[0008] In the above-described sewage pump cylinder structure, a seal is formed between the retaining ring and the rotor shaft by an annular oil seal, which is located below the upper mechanical seal. The annular oil seal positioned below the upper mechanical seal separates the upper mechanical seal from the pressure relief chamber, thereby extending the lifespan of the upper mechanical seal and further extending the motor's lifespan.

[0009] In the above-described sewage pump cylinder structure, an annular protrusion matching the annular oil seal is formed on the bottom wall of the retaining ring, and the annular protrusion is fitted over the rotor shaft; the annular oil seal is inserted into the annular protrusion and presses against the retaining ring, with the inner and outer walls of the annular oil seal contacting and sealing the outer wall of the rotor shaft and the inner wall of the annular protrusion, respectively. This design facilitates the installation of the annular oil seal.

[0010] In the above-mentioned sewage pump cylinder structure, a connecting ring coaxial with the rotor shaft is formed on the top of the pump body, and the lower end of the bearing seat is pressed and fixed on the connecting ring; the above-mentioned cavity is formed between the top wall of the pump body, the bearing seat and the connecting ring, and the water outlet is set on the side wall of the connecting ring to facilitate the design and processing of the water outlet.

[0011] In the above-mentioned sewage pump cylinder structure, the upper side of the inlet is open to reduce the difficulty of processing the inlet.

[0012] In the above-mentioned sewage pump cylinder structure, the water inlet is an arc shape coaxial with the rotor shaft to increase the water flow rate of the water inlet, making the flow between the pressure relief chamber and the outside smoother and enhancing the pressure relief effect of the pressure relief chamber.

[0013] In the above-mentioned sewage pump cylinder structure, there are at least two water inlets, which are evenly distributed along the circumference of the connecting ring.

[0014] In the above-mentioned sewage pump cylinder structure, an annular channel is formed between the upper end of the sealing seat and the rotor shaft, and the width of the annular channel is 0.4mm to 0.6mm, so that the sealing seat and the rotor shaft adopt a very small clearance fit, blocking most of the impurities and extending the service life of the lower mechanical seal.

[0015] In the aforementioned sewage pump cylinder structure, a cylindrical filter screen is fixed inside the pressure relief chamber. The cylindrical filter screen is sleeved outside the rotor shaft, and the sealing seat is located inside the cylindrical filter screen. The aforementioned water inlet connects to the inner cavity of the cylindrical filter screen through filter holes densely distributed on the cylindrical filter screen. The cylindrical filter screen is installed between the water inlet and the sealing seat to block large particles and strip-shaped impurities outside the cylindrical filter screen.

[0016] Compared with existing technologies, the structure of this sewage pump cylinder has the following advantages:

[0017] 1. When the sewage pump is used submerged in water, water enters through the inlet and fills the pressure relief chamber. When the lower mechanical seal is damaged, the high-pressure water in the pump body is sprayed into the pressure relief chamber through the lower mechanical seal. The pressure is reduced by the water in the pressure relief chamber, which effectively prevents the high-pressure water from impacting the upper mechanical seal and flowing to the motor. This effectively prevents water from entering the motor and extends the motor's life.

[0018] 2. A ring-shaped oil seal is installed below the upper mechanical seal to separate the upper mechanical seal from the pressure relief chamber, thereby extending the life of the upper mechanical seal and further extending the life of the motor. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the sewage pump in Example 1.

[0020] Figure 2 This is a cross-sectional schematic diagram of the sewage pump in Example 1.

[0021] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0022] Figure 4 This is a three-dimensional schematic diagram of the sewage pump in Example 2.

[0023] In the diagram, 1. Pump body; 1a. Sealing seat; 1b. Connecting ring; 1c. Water inlet; 2. Motor; 2a. Bearing housing; 2a1. Oil hole; 2b. Rotor shaft; 3. Impeller; 4. Cavity; 4a. Oil chamber; 4b. Pressure relief chamber; 5. Retaining ring; 5a. Annular protrusion; 6. Upper mechanical seal; 7. Lower mechanical seal; 7a. Stationary ring; 7b. Rotary ring; 8. Annular oil seal; 9. Sealing element; 10. Cylindrical filter screen. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] Example 1: As Figure 1 and Figure 2 As shown, in this sewage pump cylinder structure, the sewage pump includes a pump body 1 and a motor 2 vertically mounted above the pump body 1. The pump body 1 has an inner cavity for housing the impeller 3. The motor 2 includes a bearing housing 2a fixed to the pump body 1 and a rotor shaft 2b vertically inserted within the bearing housing 2a, with the bearing housing 2a and rotor shaft 2b rotatably coupled via bearings.

[0026] like Figure 2 As shown, the hydraulic cylinder structure of this sewage pump includes a cavity 4 formed between the bearing housing 2a and the pump body 1. A retaining ring 5 is horizontally fixed within the cavity 4, dividing it into an oil chamber 4a and a pressure relief chamber 4b. The oil chamber 4a and the retaining ring 5 are vertically distributed and do not communicate with each other. The retaining ring 5 and the rotor shaft 2b are coaxially arranged, with the retaining ring 5 fitted onto the rotor shaft 2b. An upper mechanical seal 6 is fitted onto the portion of the rotor shaft 2b within the oil chamber 4a. Preferably, the upper mechanical seal 6 is a double-end mechanical seal, with its two ends acting on the retaining ring 5 and the bearing housing 2a, respectively. The structure and installation method of the upper mechanical seal 6 are existing conventional technologies; for details, please refer to a sand-proof sewage pump disclosed in the Chinese Patent Database (application number: 201620661326.3), which will not be elaborated upon here.

[0027] The pump body 1 has a through hole at its top, which connects the cavity 4 to the inner cavity of the pump body 1. The lower end of the rotor shaft 2b extends into the inner cavity of the pump body 1 through the through hole and is fixed to the impeller 3. A lower mechanical seal 7 is also fitted on the rotor shaft 2b. The lower mechanical seal 7 is an existing product, and preferably a single-end mechanical seal. The lower mechanical seal 7 includes a stationary ring 7a and a rotating ring 7b fixed on the rotor shaft 2b. The rotating ring 7b is located below the stationary ring 7a, and the end of the rotating ring 7b away from the stationary ring 7a presses against the impeller 3. The specific structure of the lower mechanical seal 7 can be found in the pump mechanical seal disclosed in the Chinese Patent Database (application number: 202420207303.X).

[0028] like Figure 2 and Figure 3As shown, the pump body 1 extends upward from the through hole to form an integrally formed annular sealing seat 1a. The sealing seat 1a and the rotor shaft 2b are coaxially arranged, and the sealing seat 1a is fitted over the rotor shaft 2b. The axial cross-section of the sealing seat 1a is inverted L-shaped, and the upper end of the sealing seat 1a is clearance-fitted with the rotor shaft 2b. The lower mechanical seal 7 is located inside the pump body 1, and the stationary ring 7a is set inside the sealing seat 1a. A water outlet 1c passes through the side wall of the pressure relief chamber 4b.

[0029] When the sewage pump is submerged in water, water enters through the inlet 1c and fills the pressure relief chamber 4b. When the lower mechanical seal 7 is damaged, the high-pressure water in the pump body 1 is sprayed through the lower mechanical seal 7 into the pressure relief chamber 4b. The pressure is reduced by the water in the pressure relief chamber 4b, which effectively prevents the high-pressure water from impacting the upper mechanical seal 6 and flowing to the motor 2 position, thus effectively preventing water from entering the motor 2 and extending the life of the motor 2.

[0030] Preferably, the water inlet 1c is an arc shape coaxial with the rotor shaft 2b to increase the water flow rate of the water inlet 1c, making the flow between the pressure relief chamber 4b and the outside smoother and enhancing the pressure relief effect of the pressure relief chamber 4b; there are at least two water inlets 1c and they are evenly distributed along the circumference of the rotor shaft 2b. In the actual product, there are two water inlets 1c.

[0031] To further explain, a seal is formed between the retaining ring 5 and the rotor shaft 2b by an annular oil seal 8, and the annular oil seal 8 is located below the upper mechanical seal 6. The annular oil seal 8 is installed below the upper mechanical seal 6 to separate the upper mechanical seal 6 from the pressure relief chamber 4b, thereby extending the life of the upper mechanical seal 6 and further extending the life of the motor 2.

[0032] In this embodiment,

[0033] An oil hole 2a1 is horizontally penetrating the side wall of the bearing housing 2a. The inner end of the oil hole 2a1 connects to the oil cavity 4a, and a seal 9 is detachably fixed to the outer end of the oil hole 2a1 to seal the outer end. The seal 9 can be a sealing bolt or a rubber plug. In use, lubricating oil is injected into the oil cavity 4a through the oil hole 2a1 to extend the service life of the upper mechanical seal 6.

[0034] The retaining ring 5 is installed as follows: the upper end of the retaining ring 5 is inserted into the lower end of the bearing housing 2a, and the retaining ring 5 is fixed to the bearing housing 2a by a ring of screws. Further, the outer edge of the retaining ring 5 is pressed against the inner wall of the bearing housing 2a, and an annular rubber gasket is provided between the two, forming a reliable seal between the retaining ring 5 and the bearing housing 2a.

[0035] like Figure 3As shown, the installation method of the annular oil seal 8 is as follows: An annular protrusion 5a matching the annular oil seal 8 is formed on the bottom wall of the retaining ring 5. The annular protrusion 5a and the rotor shaft 2b are coaxially arranged, and the annular protrusion 5a is sleeved on the outside of the rotor shaft 2b. The annular oil seal 8 is inserted into the annular protrusion 5a and presses against the retaining ring 5. The inner and outer walls of the annular oil seal 8 contact and seal with the outer wall of the rotor shaft 2b and the inner wall of the annular protrusion 5a, respectively. This design facilitates the installation of the annular oil seal 8.

[0036] The cavity 4 is formed as follows: A connecting ring 1b, coaxial with the rotor shaft 2b, is formed on the top of the pump body 1, and the lower end of the bearing seat 2a is pressed and fixed onto the connecting ring 1b. Preferably, the connecting ring 1b and the bearing seat 2a are fixed together by a ring of screws. The cavity 4 is formed between the top wall of the pump body 1, the bearing seat 2a, and the connecting ring 1b, and the water inlet 1c is located on the side wall of the connecting ring 1b to facilitate the design and processing of the water inlet 1c. Preferably, the upper side of the water inlet 1c is open to reduce the processing difficulty of the water inlet.

[0037] In actual products, the upper end of the sealing seat 1a and the rotor shaft 2b are fitted with a clearance to form an annular channel between them. The width of the annular channel is 0.4mm to 0.6mm, so that the sealing seat 1a and the rotor shaft 2b adopt a minimal clearance fit, blocking most impurities and extending the service life of the lower mechanical seal 7. Preferably, the width of the annular channel is 0.5mm.

[0038] Example 2: The structure and principle of Example 2 are basically the same as those of Example 1, except that: Figure 4 As shown, a cylindrical filter screen 10 is also fixed inside the pressure relief chamber 4b. The cylindrical filter screen 10 is sleeved outside the rotor shaft 2b, and the sealing seat 1a is located inside the cylindrical filter screen 10. The aforementioned water inlet 1c connects to the inner cavity of the cylindrical filter screen 10 through filter holes densely distributed on the cylindrical filter screen 10. The cylindrical filter screen 10 is arranged between the water inlet 1c and the sealing seat 1a to block large particles and strip-shaped impurities outside the cylindrical filter screen 10. Preferably, the shape and size of the cylindrical filter screen 10 match the connecting ring 1b, and the cylindrical filter screen 10 is clamped inside the connecting ring 1b. At this time, the outer wall of the cylindrical filter screen 10 is attached to the inner wall of the connecting ring 1b, and the water inlet 1c is positioned directly opposite the cylindrical filter screen 10.

[0039] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A hydraulic cylinder structure for a sewage pump, the sewage pump including a pump body (1) and a bearing seat (2a) fixed on the pump body (1), a rotor shaft (2b) vertically passing through the bearing seat (2a), the hydraulic cylinder structure including a cavity (4) formed between the bearing seat (2a) and the pump body (1), a retaining ring (5) horizontally fixed in the cavity (4) dividing the cavity (4) into an upper and lower distributed oil chamber (4a) and a pressure relief chamber (4b), the retaining ring (5) being sleeved on the rotor shaft (2a). On 2b), and the part of the rotor shaft (2b) inside the oil chamber (4a) is fitted with an upper mechanical seal (6), the top of the pump body (1) is provided with a through hole that connects the cavity (4) to the inner cavity of the pump body (1), and the lower end of the rotor shaft (2b) extends into the inner cavity of the pump body (1) through the through hole, and a lower mechanical seal (7) is also fitted on the rotor shaft (2b), the lower mechanical seal (7) including a stationary ring (7a) and a moving ring (7b) fixed on the rotor shaft (2b), characterized in that, The pump body (1) extends upward from the through hole and forms an integral ring-shaped sealing seat (1a), and the axial section of the sealing seat (1a) is inverted L-shaped; the sealing seat (1a) is sleeved on the outside of the rotor shaft (2b), and the upper end of the sealing seat (1a) and the rotor shaft (2b) are in clearance fit; the lower mechanical seal (7) is located inside the pump body (1), and the stationary ring (7a) is set inside the sealing seat (1a); the pressure relief chamber (4b) has a through-hole (1c) penetrating through the side wall.

2. The sewage pump cylinder structure according to claim 1, characterized in that, The aforementioned retaining ring (5) and rotor shaft (2b) are sealed by an annular oil seal (8), and the annular oil seal (8) is located below the upper mechanical seal (6).

3. The sewage pump cylinder structure according to claim 2, characterized in that, The bottom wall of the retaining ring (5) is formed with an annular protrusion (5a) that matches the annular oil seal (8), and the annular protrusion (5a) is sleeved on the outside of the rotor shaft (2b); the annular oil seal (8) is inserted into the annular protrusion (5a) and presses against the retaining ring (5), and the inner and outer walls of the annular oil seal (8) are respectively in contact with the outer wall of the rotor shaft (2b) and the inner wall of the annular protrusion (5a) for sealing.

4. The sewage pump cylinder structure according to claim 1, characterized in that, The top of the pump body (1) is formed with a connecting ring (1b) coaxial with the rotor shaft (2b), and the lower end of the bearing seat (2a) is pressed and fixed on the connecting ring (1b); the cavity (4) is formed between the top wall of the pump body (1), the bearing seat (2a) and the connecting ring (1b), and the water outlet (1c) is set on the side wall of the connecting ring (1b).

5. The sewage pump cylinder structure according to claim 4, characterized in that, The upper side of the water outlet (1c) is open.

6. The sewage pump cylinder structure according to claim 4 or 5, characterized in that, The water inlet (1c) is an arc shape coaxial with the rotor shaft (2b).

7. The sewage pump cylinder structure according to claim 1, characterized in that, There are at least two water inlets (1c) and they are evenly distributed along the circumference of the connecting ring (1b).

8. The sewage pump cylinder structure according to claim 1, characterized in that, An annular channel is formed between the upper end of the sealing seat (1a) and the rotor shaft (2b), and the width of the annular channel is 0.4mm to 0.6mm.

9. The sewage pump cylinder structure according to claim 1, characterized in that, A cylindrical filter screen (10) is also fixed inside the pressure relief chamber (4b). The cylindrical filter screen (10) is sleeved outside the rotor shaft (2b), and the sealing seat (1a) is located inside the cylindrical filter screen (10). The above-mentioned water inlet (1c) is connected to the inner cavity of the cylindrical filter screen (10) through the filter holes densely distributed on the cylindrical filter screen (10).

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