Multi-stage water pump sealing structure

Abstract

The utility model provides a multi-stage water pump sealing structure, and belongs to the technical field of water pumps. The problem that an existing sealing structure affects operation of a water pump is solved. The multistage water pump sealing structure comprises a pump shell, a pump shaft vertically arranged in the pump shell and an inductive probe used for detecting cooling liquid, a connecting cylinder is arranged at the top of the pump shell, a cylinder cover is fixed to the connecting cylinder, the upper end of the pump shaft sequentially penetrates through the pump shell and the cylinder cover, and the pump shaft is sealed with the pump shell and the cylinder cover through mechanical seals. A cooling liquid inlet hole and a cooling liquid outlet hole are formed in the connecting cylinder and the cylinder cover respectively, a connecting hole is further formed in the cylinder cover in a penetrating mode, the inductive probe comprises a straight-rod-shaped body fixed in the connecting hole, the connecting hole is in a straight hole shape, and the axis of the connecting hole is parallel to the axis of the pump shaft. And the lower end of the main body extends out of the connecting hole and extends into the connecting cylinder. The multi-stage water pump sealing structure can enhance the operation stability of the water pump.

Description

TECHNICAL FIELD

[0001] The utility model belongs to water pump technical field relates to a multistage water pump, in particular to a multistage water pump sealing structure. BACKGROUND

[0002] Multistage pump refers to the pump of two or more than two impellers, obtains centrifugal force by the rotation of impeller, thereby realizes the pumping of liquid, and the output water pressure of multistage pump can be very big.

[0003] Sealing structure is the important component of multistage pump, and its structure is disclosed in a kind of multistage pump double sealing structure of Chinese patent library (application number: 202421349100.0), including pump body, shaft, first mechanical seal is arranged between the pump body and shaft, cooling cover is fixed on the top of pump body, cooling cavity is formed between the cooling cover and the top surface of pump body, the top of first mechanical seal is located in cooling cavity, second mechanical seal is arranged between the cooling cover and shaft, the cavity wall of cooling cavity is outwardly communicated with cooling liquid inlet and cooling liquid outlet, and inductive probe for detecting cooling liquid is installed on the cooling cover or pump body.

[0004] When existing sealing structure is used, the change of liquid composition in cooling cavity is detected by inductive probe to judge whether first mechanical seal leaks.But this structure still has a problem: the detection position of inductive probe is close to cooling liquid outlet, since there is certain inertia when cooling liquid pumping stops, part of leakage liquid enters cooling liquid pipeline and mixes with cooling liquid, which affects subsequent detection accuracy and causes false alarm, and affects normal use of pump. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above-mentioned problems existing in prior art, and provides a multistage water pump sealing structure with stable work.

[0006] The utility model can be realized by the following technical scheme: a multistage water pump sealing structure, including pump shell, pump shaft vertically arranged in pump shell and inductive probe for detecting cooling liquid, the top of pump shell has connecting barrel, the connecting barrel is fixed with barrel cover, the upper end of pump shaft passes through pump shell and barrel cover in sequence, and pump shaft is sealed between pump shell and barrel cover by mechanical seal, cooling liquid inlet hole and cooling liquid outlet hole are respectively arranged on connecting barrel and barrel cover, and connecting hole is further arranged on barrel cover, the inductive probe includes straight rod-shaped main body fixed in connecting hole, and the utility model is characterized in that, connecting hole is straight hole, and the axis of connecting hole and pump shaft is parallelly arranged;The main body is vertically arranged, and the lower end of main body extends out of connecting hole and extends into connecting barrel.

[0007] When used, cooling liquid is delivered by liquid pump, enters the cooling cavity composed of connecting barrel and barrel cover from cooling liquid inlet hole, and is discharged outward through cooling liquid outlet hole, to form circulating flow, so as to cool and radiate two mechanical seals.

[0008] When the mechanical seal on the lower side fails, the liquid medium pumped by the pump enters the cooling chamber. The leaked liquid medium mixes with the coolant, causing a change in the composition of the liquid in the cooling chamber. The sensor can detect this change and output an electrical signal to the alarm device, thus promptly detecting the leaked liquid medium and reminding the user that the mechanical seal on the lower side has failed, allowing for timely maintenance.

[0009] By placing the coolant outlet on the cylinder cover and extending the main body of the sensing probe into the connecting cylinder, the height difference between the sensing position of the sensing probe and the coolant outlet is greatly increased, thereby greatly reducing the probability of leaked liquid flowing into the coolant outlet. This ensures the purity of the coolant and guarantees the stability and accuracy of the subsequent detection process, giving it the advantage of stable operation.

[0010] In the aforementioned multi-stage water pump sealing structure, the outer wall of the cylinder cover has a horizontally positioned notch, formed by the side and bottom surfaces. The bottom surface of the notch is horizontal, and the connection hole is located on this horizontal surface. This design not only facilitates the forming of the connection hole but also makes it easier to install the sensing probe.

[0011] In the multi-stage water pump sealing structure described above, the notch side is angled upwards to create clearance and further facilitate the installation of the sensing probe.

[0012] In the aforementioned multi-stage water pump sealing structure, a sealing element and a spring are installed inside the coolant outlet to isolate the coolant outlet, ensuring unidirectional flow of coolant from the inside of the cylinder cover to the outside. The combination of the sealing element and the spring prevents coolant backflow during mechanical seal maintenance and further prevents leaked liquid from entering the coolant outlet, thus ensuring stable operation of the multi-stage water pump.

[0013] In the above-mentioned multi-stage water pump sealing structure, an annular sealing seat is formed on the inner wall of the coolant outlet, and the sealing element is pressed against the end face of the sealing seat under the action of a spring to block the coolant outlet.

[0014] In the above-mentioned multi-stage water pump sealing structure, a connector is provided on the outside of the cylinder cover, and one end of the connector is screwed into the above-mentioned coolant outlet hole to facilitate the connection of the coolant outlet hole to the coolant pipeline.

[0015] In the multi-stage water pump sealing structure described above, the spring is positioned between the sealing seat and the connector, with both ends of the spring pressing against the sealing seat and the connector respectively. The connector serves both as a connector and a support for the spring, achieving a dual-purpose function to simplify the structure and facilitate assembly.

[0016] Compared with existing technologies, this multi-stage water pump sealing structure has the following advantages:

[0017] 1. The coolant outlet is set on the cylinder cover, and the main body of the sensing probe is extended into the connecting cylinder to greatly increase the height difference between the sensing position of the sensing probe and the coolant outlet. This greatly reduces the probability of leaked liquid flowing into the coolant outlet, thus ensuring the purity of the coolant and ensuring the stability and accuracy of the subsequent detection process. It has the advantage of stable operation.

[0018] 2. With the cooperation of the seal and spring, it can prevent coolant backflow during mechanical seal maintenance and further prevent leaked liquid from entering the coolant outlet, thus ensuring the stable operation of this multistage water pump. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the sealing structure of this multi-stage water pump.

[0020] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0021] In the diagram, 1. Pump casing; 1a. Connecting cylinder; 1b. Coolant inlet; 2. Pump shaft; 3. Sensor probe; 3a. Main body; 4. Cylinder cover; 4a. Coolant outlet; 4b. Connecting hole; 4c. Notch; 4c1. Side; 4d. Sealing seat; 5. Mechanical seal; 6. Sealing element; 7. Spring; 8. Connector. Detailed Implementation

[0022] 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.

[0023] like Figure 1 As shown, this multi-stage water pump sealing structure includes a pump casing 1, a pump shaft 2 vertically disposed within the pump casing 1, and a sensing probe 3 for detecting coolant. The sensing probe 3 is an existing product and can be a thermal conductivity probe, a transparency sensor, or a leakage sensor. Preferably, the sensing probe 3 is a thermal conductivity probe, which includes a straight rod-shaped body 3a.

[0024] Specifically

[0025] The pump casing 1 has a connecting cylinder 1a at its top, and the connecting cylinder 1a and the pump casing 1 are coaxially arranged. Preferably, the connecting cylinder 1a and the pump casing 1 are an integral structure. A cylinder cover 4 is fixed on the connecting cylinder 1a, and the cylinder cover 4 covers the upper port of the connecting cylinder 1a. In the actual product, the cylinder cover 4 and the connecting cylinder 1a are fixed together by a ring of vertically arranged bolts, and a sealing ring is formed between the two.

[0026] like Figure 1As shown, the upper end of the pump shaft 2 passes through the pump housing 1 and the cylinder cover 4 in sequence, and the pump shaft 2 forms a seal with the pump housing 1 and the cylinder cover 4 through the mechanical seal 5. The connecting cylinder 1a and the cylinder cover 4 are respectively provided with a coolant inlet 1b and a coolant outlet 4a. The cylinder cover 4 is also provided with a connecting hole 4b, and the main body 3a is installed in the connecting hole 4b. Preferably, the main body 3a is screwed into the connecting hole 4b, and the main body 3a also forms a seal with the inner wall of the connecting hole 4b through a sealing ring. Further, the connecting hole 4b is a straight hole, and the axes of the connecting hole 4b and the pump shaft 2 are parallel, that is, the connecting hole 4b is vertically positioned. The main body 3a is vertically positioned, and the lower end of the main body 3a extends out of the connecting hole 4b and into the connecting cylinder 1a.

[0027] During use, the coolant is delivered by a liquid pump and enters the cooling chamber consisting of the connecting cylinder 1a and the cylinder cover 4 through the coolant inlet 1b. It is then discharged outward through the coolant outlet 4a, forming a circulating flow to cool and dissipate heat from the two mechanical seals 5.

[0028] When the mechanical seal 5 on the lower side fails, the liquid medium transported by the pump enters the cooling chamber. The leaked liquid medium mixes with the coolant, causing a change in the composition of the liquid in the cooling chamber. The sensing probe 3 can detect this change and output an electrical signal to the alarm device. Therefore, it can detect the leaked liquid medium in time, reminding the user that the mechanical seal 5 on the lower side has failed and to perform maintenance in time.

[0029] The coolant outlet 4a is set on the cylinder cover 4, and the main body 3a of the sensing probe 3 is extended into the connecting cylinder 1a. This greatly increases the height difference between the sensing position of the sensing probe 3 and the coolant outlet 4a, thereby greatly reducing the probability of leaked liquid flowing into the coolant outlet 4a. This ensures the purity of the coolant and ensures that the subsequent detection process is stable and accurate, and has the advantage of stable operation.

[0030] The outer wall of the cylinder cover 4 has a horizontally positioned notch 4c, which is formed by a side surface 4c1 and a bottom surface. The bottom surface of the notch 4c is horizontal, and the connecting hole 4b is located on this horizontal surface. This design not only facilitates the forming of the connecting hole 4b but also makes it easier to install the sensor probe 3. Preferably, the side surface 4c1 of the notch 4c is angled upwards to create a clearance, further facilitating the installation of the sensor probe 3.

[0031] like Figure 1 and Figure 2 As shown, a seal 6 and a spring 7 are provided inside the coolant outlet 4a to isolate the coolant outlet 4a, so that the coolant outlet 4a can unidirectionally flow from the inside of the cylinder cover 4 to the outside of the cylinder cover 4. With the cooperation of the seal 6 and the spring 7, it is possible to prevent coolant backflow during mechanical seal 5 maintenance and further prevent leaked liquid from entering the coolant outlet 4a, thereby ensuring the stable operation of this multistage water pump.

[0032] Specifically, an annular sealing seat 4d is formed on the inner wall of the coolant outlet 4a. The aforementioned sealing element 6 is pressed against the end face of the sealing seat 4d under the action of the spring 7 to block the coolant outlet 4a. A connector 8 is provided on the outside of the cylinder cover 4, and one end of the connector 8 is screwed into the coolant outlet 4a to facilitate the connection of the coolant outlet 4a to the coolant pipeline. The spring 7 is located between the sealing seat 4d and the connector 8, and both ends of the spring 7 press against the sealing seat 4d and the connector 8 respectively. The connector 8 serves both as a connector and a support for the spring 7, providing a dual-purpose function to simplify the structure and facilitate assembly.

[0033] To further explain, the seal 6 is spherical, and the inner hole of the sealing seat 4d near the spring 7 is tapered to match the seal 6, so as to enhance the sealing performance between the seal 6 and the sealing seat 4d.

[0034] 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 multi-stage water pump sealing structure, comprising a pump casing (1), a pump shaft (2) vertically disposed within the pump casing (1), and a sensing probe (3) for detecting coolant, wherein the top of the pump casing (1) has a connecting cylinder (1a), a cylinder cover (4) is fixed on the connecting cylinder (1a), the upper end of the pump shaft (2) passes through the pump casing (1) and the cylinder cover (4) in sequence, and the pump shaft (2) forms a seal with the pump casing (1) and the cylinder cover (4) through a mechanical seal (5), the connecting cylinder (1a) and the cylinder cover (4) are respectively provided with a coolant inlet (1b) and a coolant outlet (4a), and the cylinder cover (4) is also provided with a connecting hole (4b), the sensing probe (3) comprising a main body (3a) fixed within the connecting hole (4b) and in the shape of a straight rod, characterized in that, The connecting hole (4b) is a straight hole, and the axes of the connecting hole (4b) and the pump shaft (2) are parallel; the main body (3a) is vertically arranged, and the lower end of the main body (3a) extends out of the connecting hole (4b) and into the connecting cylinder (1a).

2. The multi-stage water pump sealing structure according to claim 1, characterized in that, The outer wall of the aforementioned cap (4) has a horizontally arranged notch (4c), which is surrounded by a side (4c1) and a bottom surface. The bottom surface of the notch (4c) is a horizontal surface, and the aforementioned connecting hole (4b) is opened on the horizontal surface.

3. The multi-stage water pump sealing structure according to claim 2, characterized in that, The notch (4c) is set at an angle upward on the side (4c1).

4. The multi-stage water pump sealing structure according to claim 1, characterized in that, The coolant outlet (4a) is provided with a seal (6) and a spring (7) that makes the seal (6) block the coolant outlet (4a) so that the coolant outlet (4a) can be unidirectionally guided from the inside of the cap (4) to the outside of the cap (4).

5. The multi-stage water pump sealing structure according to claim 4, characterized in that, A ring-shaped sealing seat (4d) is formed on the inner wall of the coolant outlet (4a). The sealing element (6) is pressed against the end face of the sealing seat (4d) under the action of the spring (7) to block the coolant outlet (4a).

6. The multi-stage water pump sealing structure according to claim 5, characterized in that, The cylinder cover (4) is provided with a connector (8), and one end of the connector (8) is screwed into the coolant outlet (4a).

7. The multi-stage water pump sealing structure according to claim 6, characterized in that, The spring (7) is located between the sealing seat (4d) and the joint (8), and the two ends of the spring (7) press against the sealing seat (4d) and the joint (8) respectively.

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