Water pump dry-wet separation structure and water pump

Abstract

The utility model belongs to water pump technical field, concretely relates to a water pump dry and wet separation structure and water pump, including upper cavity and lower cover, the lower cover seal cover is located the opening at upper cavity lower extreme, the axle of upper cavity and lower cover all is provided with sealing groove, the groove bottom of two sealing grooves is penetrated by drive shaft, the drive shaft is equipped with the shaft seal assembly corresponding with two sealing grooves respectively, at least a part of shaft seal assembly is on the sealing groove, and in the sealing groove sliding rotation. Upper cavity and lower cover all are provided with sealing groove, and the dynamic seal of shaft gap is carried out with shaft seal assembly in sealing groove, and the liquid of two double barriers of vortex fan area can not flow into motor area, and the leakage water chamber is reserved between upper cavity and lower cover, so that the liquid of shaft seal leakage from vortex fan one side can be temporarily kept in it, so that the leakage liquid loses water pressure, thereby guaranteeing that the shaft seal near motor one side can completely block the entry of liquid.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, specifically relating to a water pump dry-wet separation structure and a water pump. Background Technology

[0002] A water pump is a machine that transports or pressurizes liquids. It transfers the mechanical energy of a prime mover or other external energy to the liquid, increasing its energy. It is mainly used to transport liquids including water, oil, acids and alkalis, emulsions, suspensions, and liquid metals. It can also transport mixtures of liquids and gases, as well as liquids containing suspended solids. Technical parameters of water pump performance include flow rate, suction head, discharge head, shaft power, water power, and efficiency. Based on different working principles, they can be classified into positive displacement pumps, centrifugal pumps, etc. Positive displacement pumps transfer energy by utilizing changes in the volume of their working chamber; centrifugal pumps transfer energy by utilizing the interaction between rotating blades and water, and include centrifugal pumps, axial flow pumps, and mixed flow pumps.

[0003] The sealing structure for the motor shaft of a sewage pump disclosed in patent CN206280295U belongs to the field of water pump technology. It solves the problem that existing ordinary sealing structures are easily damaged by solid particles in impurities, leading to deformation of the sealing ring, reduced sealing effect of the water pump, and in severe cases, water ingress and burnout of the motor. This sealing structure for the motor shaft of the sewage pump includes a motor shaft and a bearing and bearing housing mounted on the motor shaft. A portion of the bearing extends out of the bearing housing and forms a sealing groove with the bearing housing. A sealing ring is fitted inside the sealing groove. Several metal strips with heads bent towards the center are vertically and evenly embedded inside the sealing ring. A groove is formed at the top of the sealing ring, and a retaining ring is set inside the groove to form a seal between the sealing ring and the motor shaft. This utility model, by embedding metal strips inside the sealing ring and fitting a retaining ring at the top of the sealing ring, has the advantages of longer service life and better sealing effect.

[0004] In the above solution, the sealing performance is increased by forming a fit between the sealing ring and the motor shaft. However, the vibration and rotation of the motor shaft during operation will increase the sealing degree between the two, which will cause moisture in the turbofan to leak into the motor part. Summary of the Invention

[0005] The purpose of this utility model is to address the above-mentioned problems by providing a water pump dry-wet separation structure and water pump that can solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The water pump has a dry and wet separation structure, including an upper cavity and a lower cover. The lower cover is sealed at the opening at the lower end of the upper cavity. Both the upper cavity and the lower cover have sealing grooves at their axial centers. The bottom of the two sealing grooves is penetrated by a drive shaft. The drive shaft is fitted with shaft seal assemblies corresponding to the two sealing grooves respectively. At least a part of the shaft seal assembly rests against the sealing groove and slides and rotates within the sealing groove.

[0007] In the aforementioned water pump dry-wet separation structure, the shaft seal assembly includes a shaft seal ring and a groove seal ring connected coaxially at their end faces. The inner ring of the shaft seal ring is slidably disposed on the drive shaft, and at least a portion of the outer ring of the groove seal ring slides axially and radially in contact with the inner wall of the sealing groove, respectively.

[0008] In the aforementioned water pump dry-wet separation structure, an abutting sealing part is provided on the outer ring of the groove sealing ring. The end face of the abutting sealing part abuts against the bottom of the sealing groove, and the circumferential surface of the abutting sealing part abuts against the side surface of the sealing groove.

[0009] In the aforementioned water pump dry-wet separation structure, the end face of the abutting sealing part extends beyond the end face of the groove sealing ring and covers the outer side of the end face of the groove sealing ring.

[0010] In the aforementioned water pump dry-wet separation structure, a sealing and pressurizing assembly is provided on the drive shaft. The sealing and pressurizing assembly acts on the shaft sealing ring, pushing the shaft sealing ring to slide towards the bottom of the sealing groove.

[0011] In the aforementioned water pump dry-wet separation structure, the sealing and pressurizing assembly includes a sealing spring and a retaining ring. The retaining ring is snapped onto the drive shaft, one axial end of the sealing spring abuts against the retaining ring, and the other end of the sealing spring abuts against the shaft sealing ring.

[0012] In the aforementioned water pump dry-wet separation structure, a limiting tray that engages with the retaining spring is sleeved on the drive shaft. The bottom surface of the limiting tray supports one end of the sealing spring and circumferentially restricts the sealing spring through its edge surface.

[0013] In the aforementioned water pump dry-wet separation structure, the sealing groove on the lower cover is recessed towards the upper cavity, thereby forming an annular leakage and water accumulation chamber with the upper cavity.

[0014] In the aforementioned water pump dry-wet separation structure, a water level sensor is installed on the upper cavity, and the detection end of the water level sensor extends to the bottom of the leakage and water accumulation chamber.

[0015] In the aforementioned water pump dry-wet separation structure, an annular positioning baffle is provided on the lower cover, and the positioning baffle cooperates with the inner wall of the side facade of the upper cavity.

[0016] This utility model also provides a water pump, which includes the aforementioned water pump dry-wet separation structure.

[0017] The advantages of this utility model are: Both the upper cavity and the lower cover are equipped with sealing grooves. At the same time, a shaft seal assembly is used in the sealing grooves to dynamically seal the shaft clearance. This double barrier prevents the liquid in the turbofan area from flowing into the motor area. In addition, a leakage water accumulation chamber is reserved between the upper cavity and the lower cover, allowing the liquid leaking from the shaft seal on the turbofan side to remain in it temporarily. This causes the leaking liquid to lose water pressure, thus ensuring that the shaft seal on the side near the motor can completely prevent the liquid from entering. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the dry and wet separation structure of the water pump of this utility model.

[0019] Figure 2 This is a schematic diagram of the internal structure of the water pump's dry-wet separation mechanism of this utility model.

[0020] Figure 3 This is a schematic diagram of the shaft seal assembly of this utility model.

[0021] Figure 4 This is a schematic diagram of the water pump structure of this utility model.

[0022] Figure 5 This is a schematic diagram of the internal structure of the water pump of this utility model.

[0023] In the diagram, the components are: upper cavity 1, lower cover 2, positioning baffle 21, sealing groove 3, drive shaft 4, shaft seal assembly 5, shaft sealing ring 51, groove sealing ring 52, abutting sealing part 53, sealing pressure assembly 6, sealing spring 61, snap ring 62, limit tray 63, and leakage water accumulation chamber 7. Detailed Implementation

[0024] The following are specific embodiments of the utility model, which are described in conjunction with the accompanying drawings to further illustrate the technical solution of the utility model. However, the utility model is not limited to these embodiments.

[0025] Example 1

[0026] like Figures 1-3 As shown, the water pump dry-wet separation structure includes an upper cavity 1 and a lower cover 2. The lower cover 2 is characterized by a sealing cover located at the opening at the lower end of the upper cavity 1. Both the upper cavity 1 and the lower cover 2 have sealing grooves 3 at their axial centers. The bottom of the two sealing grooves 3 is penetrated by a drive shaft 4. A shaft seal assembly 5 corresponding to the two sealing grooves 3 is sleeved on the drive shaft 4. At least a part of the shaft seal assembly 5 rests against the sealing groove 3 and slides and rotates within the sealing groove 3.

[0027] That is, both the upper cavity and the lower cover are equipped with sealing grooves, and the shaft clearance is dynamically sealed in the sealing grooves by a shaft seal assembly. This double barrier prevents the liquid in the turbofan area from flowing into the motor area. In addition, a leakage water accumulation chamber is reserved between the upper cavity and the lower cover, so that the liquid leaking from the shaft seal on the turbofan side can be temporarily retained in it, so that the leaking liquid loses water pressure and thus ensures that the shaft seal on the side near the motor can completely prevent the liquid from entering.

[0028] In this embodiment, the shaft seal assembly 5 includes a shaft seal ring 51 and a groove seal ring 52 connected coaxially. The inner ring of the shaft seal ring 51 is slidably disposed on the drive shaft 4, and at least a portion of the outer ring of the groove seal ring 52 slides axially and radially in contact with the inner wall of the sealing groove 3.

[0029] The inner ring of the shaft seal ring 51 slides on the arc surface of the drive shaft 4, and the two can move axially and rotate circumferentially, which is used for sealing between the shaft and the shaft seal; the outer ring of the groove seal ring 52 slides in the sealing groove 3, and since it is axially against the bottom of the groove, it can only rotate circumferentially, which is used for sealing between the shaft seal and the groove opening.

[0030] Among them, the elastic body of the sealing contact part of the shaft sealing ring 51 and the groove sealing ring 52 can be nitrile rubber to maintain a certain pressure with the sealing surface, and the contact surface can be a siliconized carbon layer suitable for sliding on the sealing surface.

[0031] In this embodiment, an abutting sealing part 53 is provided on the outer ring of the groove sealing ring 52. The end face of the abutting sealing part 53 abuts against the bottom of the sealing groove 3, and the circumferential surface of the abutting sealing part 53 abuts against the side surface of the sealing groove 3.

[0032] The diameter of the sealing part 53 is similar to that of the sealing groove 3, and it cooperates with the side of the groove to establish a circumferential seal. The annular end face of the sealing part 53 abuts against the bottom surface of the groove around the drive shaft 4, together preventing liquid from passing through the shaft hole gap.

[0033] In this embodiment, the end face of the sealing part 53 extends beyond the end face of the groove sealing ring 52 and covers the outer side of the end face of the groove sealing ring 52.

[0034] The sealing part 53 extends outward from the end face of the sealing ring 52. When it abuts against the bottom surface of the sealing groove 3, the axial force direction is also further outward than the axial force of the sealing ring 52. Therefore, a radial component force is generated, causing the outer arc of the sealing part 53 to abut against the side wall of the sealing groove 3, thereby establishing a two-way fit with the sealing groove 3 and improving the reliability of the seal.

[0035] In this embodiment, a sealing and pressurizing assembly 6 is provided on the drive shaft 4. The sealing and pressurizing assembly 6 acts on the shaft sealing ring 51, pushing the shaft sealing ring 51 to slide towards the bottom of the sealing groove 3.

[0036] By utilizing elastic elements to provide continuous pressure, the sealing surfaces are always in pressure contact, maintaining a tight seal even when water pressure increases or the shaft vibrates, and can also automatically compensate for gaps caused by seal wear.

[0037] In this embodiment, the sealing and pressurizing assembly 6 includes a sealing spring 61 and a retaining ring 62. The retaining ring 62 is engaged with the drive shaft 4, and one axial end of the sealing spring 61 abuts against the retaining ring 62, while the other end of the sealing spring 61 abuts against the shaft sealing ring 51.

[0038] The snap ring 62, acting as a positioning stop for the sealing spring 61, is inserted into a slot on the drive shaft 4. The sealing spring 61 is compressed and, with the snap ring 62 as the base point, pushes the shaft seal against the bottom surface of the sealing groove 3, continuously applying pressure to the shaft seal.

[0039] In this embodiment, a limiting tray that engages with the snap ring 62 is sleeved on the drive shaft 4. The bottom surface of the limiting tray 63 supports one end of the sealing spring 61 and circumferentially restricts the sealing spring 61 through the edge surface.

[0040] The tray abuts against the retaining ring while the bottom surface supports the spring, and the circumferential surface is used to limit the range of the spring's outer diameter, which can prevent the spring from swinging left and right and thus improve compression stability.

[0041] In this embodiment, the sealing groove 3 on the lower cover 2 is recessed to the side of the upper cavity 1, thereby forming an annular leakage water accumulation chamber 7 with the upper cavity 1. A water level sensor is provided on the upper cavity 1, and the detection end of the water level sensor extends to the bottom of the leakage water accumulation chamber 7.

[0042] The sealing groove on the lower cover is recessed towards the upper cavity, thus forming an annular leakage and water accumulation chamber 7 around the rotating axis in the wall. As the sealing groove 3 moves upward, it requires greater water pressure to press the liquid into the leakage and water accumulation chamber 7, which increases the difficulty of water seepage. At the same time, the space in the inner cavity can release water pressure, ensuring that the water will not continue to flow upward to the side shaft hole.

[0043] In this embodiment, an annular positioning baffle 21 is provided on the lower cover 2, and the positioning baffle 21 cooperates with the inner wall of the side facade of the upper cavity 1.

[0044] A water level sensor is installed on the upper cavity. The probe extends to the bottom of the leakage chamber to monitor the leakage in real time. When the sealing structure fails, an alarm can be sounded in advance, and the machine will be shut down to prevent the motor from burning out.

[0045] Example 2

[0046] like Figures 4-5As shown, the water pump dry-wet separation structure in Embodiment 1 is applied to the water pump. The cavity of the dry-wet separation structure is set between the motor area and the turbofan lifting area. It not only blocks water seepage from the shaft hole gap through the shaft seal assembly 5, but also provides a buffer space for leakage water, ensuring the safety of the water pump motor area.

[0047] 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 water pump dry-wet separation structure, comprising an upper cavity (1) and a lower cover (2), characterized in that, The lower cover (2) is sealed at the opening at the lower end of the upper cavity (1). Both the upper cavity (1) and the lower cover (2) have sealing grooves (3) at their axial centers. The bottom of the two sealing grooves (3) is penetrated by a drive shaft (4). The drive shaft (4) is fitted with shaft sealing assemblies (5) corresponding to the two sealing grooves (3) respectively. At least a part of the shaft sealing assembly (5) rests against the sealing groove (3) and slides and rotates in the sealing groove (3).

2. The water pump dry-wet separation structure according to claim 1, characterized in that, The shaft seal assembly (5) includes a shaft seal ring (51) and a groove seal ring (52) connected coaxially. The inner ring of the shaft seal ring (51) is slidably disposed on the drive shaft (4), and at least a portion of the outer ring of the groove seal ring (52) slides axially and radially in contact with the inner wall of the sealing groove (3).

3. The water pump dry-wet separation structure according to claim 2, characterized in that, The outer ring of the groove sealing ring (52) is provided with an abutting sealing part (53), the end face of the abutting sealing part (53) abuts against the bottom of the sealing groove (3), and the circumferential surface of the abutting sealing part (53) abuts against the side surface of the sealing groove (3).

4. The water pump dry-wet separation structure according to claim 3, characterized in that, The end face of the abutting sealing part (53) extends beyond the end face of the groove sealing ring (52) and covers the outer side of the end face of the groove sealing ring (52).

5. The water pump dry-wet separation structure according to claim 2, characterized in that, A sealing and pressurizing assembly (6) is provided on the drive shaft (4). The sealing and pressurizing assembly (6) acts on the shaft sealing ring (51) and pushes the shaft sealing ring (51) to slide towards the bottom of the sealing groove (3).

6. The water pump dry-wet separation structure according to claim 5, characterized in that, The sealing and pressurizing assembly (6) includes a sealing spring (61) and a retaining ring (62). The retaining ring (62) is engaged with the drive shaft (4). One end of the sealing spring (61) abuts against the retaining ring (62) in the axial direction, and the other end of the sealing spring (61) abuts against the shaft sealing ring (51).

7. The water pump dry-wet separation structure according to claim 6, characterized in that, A limiting tray that engages with the snap ring (62) is sleeved on the drive shaft (4). The bottom surface of the limiting tray (63) supports one end of the sealing spring (61) and circumferentially restricts the sealing spring (61) through the edge surface.

8. The water pump dry-wet separation structure according to claim 1, characterized in that, The sealing groove (3) on the lower cover (2) is recessed towards the upper cavity (1) to form an annular leakage water accumulation chamber (7) with the upper cavity (1). A water level sensor is provided on the upper cavity (1), and the detection end of the water level sensor extends to the bottom of the leakage water accumulation chamber (7).

9. The water pump dry-wet separation structure according to claim 8, characterized in that, The lower cover (2) is provided with an annular positioning baffle (21), which cooperates with the inner wall of the side facade of the upper cavity (1).

10. A water pump, characterized in that, The water pump includes the water pump dry-wet separation structure as described in any one of claims 1-9.

Images