Small-sized self-priming pump with back blades on impeller

Abstract

The utility model discloses a small-sized self-priming pump with a back blade on an impeller, which relates to the field of self-priming centrifugal pumps and comprises a pump body, the impeller, a pump cover and a motor, the impeller is mounted in the pump body, the pump cover is mounted at an opening of the pump body for sealing, a shaft of the motor penetrates through the pump cover and then is connected with and drives the impeller, and a mechanical seal is mounted on the shaft between the impeller and the pump cover. The pump cover and the motor are supported through a support. A plurality of back blades are integrally arranged on the back of the impeller, at least one flushing flow channel is formed in the pump cover, an inlet of the flushing flow channel faces the outer edges of the back blades, and an outlet of the flushing flow channel faces the mechanical seal. When the impeller rotates, the back blades rotate synchronously so as to stir liquid flow at the position of the mechanical seal, the liquid flow flushes the mechanical seal through the flushing flow channel, and meanwhile, the back blades discharge liquid at the position of the mechanical seal under the action of centrifugal force. The pump cover serves as a corresponding flushing flow channel, and efficient self-flushing mechanical sealing is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of self-priming centrifugal pump, concretely relates to a small self-priming pump with back vane impeller. BACKGROUND

[0002] The ordinary self-priming pump in the prior art usually transports clean liquid without impurities, and the liquid in the pump and the atmosphere mainly rely on mechanical seal to prevent leakage. The installation position of the mechanical seal of the ordinary clean water self-priming pump is in the same chamber as the transported medium when the pump is designed, and the mechanical seal is immersed in the transported liquid when the water pump is running. Since the transported medium is clean liquid without impurities, it will not adversely affect the sealing performance of the mechanical seal.

[0003] In particular, there is also a kind of self-priming centrifugal pump specially used for transporting slightly impure water, which is called self-priming pump (adopting semi-open impeller design). This kind of water pump is mainly used for transporting liquid containing a small amount of small-size impurities, suspended solids and short fibers as well as ordinary clean water. However, it is worth noting that the design of the installation position of the mechanical seal of the above-mentioned self-priming pump is still the same as that of the conventional self-priming centrifugal pump for transporting clean liquid, and there is no difference in structure. The mechanical seal is not specially designed for the transported medium. When the water pump is running, the mechanical seal is immersed in the liquid containing impurities, and the mechanical seal is easily affected by impurities, which may cause the sealing performance to decrease or even leak, thereby adversely affecting the reliability and service life of the product. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the defects of the prior art, and provides a small self-priming pump with back vane impeller, and a corresponding flushing flow channel is formed in the pump cover to realize efficient self-flushing mechanical seal.

[0005] The utility model aims at overcoming the defects of the prior art, and provides a small self-priming pump with back vane impeller, and a corresponding flushing flow channel is formed in the pump cover to realize efficient self-flushing mechanical seal.

[0006] As a further technical scheme, the back vane, the inner wall surface of the pump cover and the flushing flow channel cooperate to form a secondary impeller seal, which is used for plugging the high-pressure side liquid flow during operation and making parking seal with the mechanical seal.

[0007] As a further technical solution, the back blades are evenly distributed along the circumference of the impeller.

[0008] As a further technical solution, the mechanical seal is a single-end mechanical seal.

[0009] The beneficial effects of this utility model are as follows:

[0010] 1. The impeller back blade is integrally cast on the back of the impeller, which, together with the inner wall of the pump cover and the flushing channel, forms a secondary impeller seal. It can block the high-pressure side liquid flow during operation and provide a shutdown seal with the mechanical seal. It can effectively seal in high-temperature, highly corrosive and solid particulate media to prevent media leakage and solve the three waste problems.

[0011] 2. The back blades effectively agitate the fluid flow at the mechanical seal, achieving the purpose of flushing the mechanical seal and preventing impurities from accumulating in the mechanical seal cavity, and also protecting the mechanical seal and the auxiliary impeller seal;

[0012] 3. A flushing channel is provided on the pump cover, and the outlet of the flushing channel faces the mechanical seal, so that the mechanical seal is flushed and cooled synchronously during the operation of the self-priming pump, preventing the sedimentation of slight sewage or suspended matter containing slight impurities. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a partially enlarged schematic diagram of the connection between the pump body and the motor in this utility model.

[0015] Explanation of reference numerals in the attached drawings: 1. Pump body; 2. Impeller; 3. Pump cover; 4. Mechanical seal; 5. Bracket; 6. Motor; 7. Back blade; 8. Flushing channel; 10. Shaft. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings:

[0017] Example: As attached Figure 1 , 2 As shown, this small self-priming pump with impeller back blades includes a pump body 1, an impeller 2, a pump cover 3, a mechanical seal 4, a bracket 5, a motor 6, back blades 7, a flushing channel 8, and a shaft 10.

[0018] Reference Appendix Figure 1 The impeller 2 is installed inside the pump body 1. A pump cover 3 is installed at the opening of the pump body 1 near the motor 6 for sealing. The shaft 10 of the motor 6 passes through the pump cover 3 and extends into the pump body 1, connecting and driving the impeller 2. A mechanical seal 4 is installed on the shaft 10 between the impeller 2 and the pump cover 3. The pump cover 3 and the motor 6 are supported by a bracket 5.

[0019] Further, as shown in Fig. Figure 2 A plurality of back vanes 7 are integrally cast on the back of the impeller 2 (preferably, the back vanes 7 are uniformly distributed along the circumferential direction of the impeller 2), and at least one flushing flow channel 8 is formed on the pump cover 3 (preferably, if there are a plurality of flushing flow channels 8, they are uniformly distributed along the circumferential direction of the pump cover 3). The inlet of each flushing flow channel 8 is directed to the outer edge of the back vane 7, and the outlet of the flushing flow channel 8 is directed to the mechanical seal 4. When the impeller 2 rotates, the back vane 7 rotates synchronously, thereby stirring the liquid flow at the mechanical seal 4, and the liquid flow flushes the mechanical seal 4 through the flushing flow channel 8, and the back vane 7 expels the liquid at the mechanical seal 4 by centrifugal force.

[0020] Preferably, the mechanical seal 4 is a single-end mechanical seal. Further, the back vane 7 cooperates with the inner wall surface of the pump cover 3 and the flushing flow channel 8 to form a secondary impeller seal, which can block the high-pressure side liquid flow during operation and seal the mechanical seal 4 during parking.

[0021] The working process of the utility model is as follows:

[0022] The utility model utilizes the back vane 7, the pump cover 3 and the flushing flow channel 8 on the pump cover 3 to form a secondary impeller seal, and the water (liquid) flows through the flushing flow channel (hole) 8 on the pump cover 3 to flush the mechanical seal 4, and the back vane 7 on the impeller 2 expels the water (liquid) at the mechanical seal 4 by centrifugal force, the purpose is to effectively stir the liquid flow at the mechanical seal 4, flush the mechanical seal 4, prevent impurities from depositing in the cavity of the mechanical seal 4, and achieve the purpose of protecting the mechanical seal and the secondary impeller seal.

[0023] The back vane 7 on the impeller 2 is integrally cast with the impeller, and the back vane cooperates with the pump cover wall to form a secondary impeller seal, which can effectively block the high-pressure side liquid flow during operation and seal the mechanical seal 4 during parking, and can effectively seal in a high-temperature, strong-corrosion and solid-particle-containing medium, prevent medium leakage and solve the problem of three wastes.

[0024] It can be understood that equivalent replacement or change of the technical scheme and the utility model concept of the utility model by those skilled in the art should belong to the protection scope of the claims attached to the utility model.

Claims

1. A small self-priming pump with back vane impeller, comprising a pump body (1), an impeller (2), a pump cover (3) and a motor (6), the impeller (2) is installed in the pump body (1), the pump cover (3) is installed at the mouth of the pump body (1) for sealing, the shaft (10) of the motor (6) penetrates through the pump cover (3) and is connected to drive the impeller (2), a mechanical seal (4) is installed on the shaft (10) between the impeller (2) and the pump cover (3), and the pump cover (3) and the motor (6) are supported through a support (5); characterized in that: The back of the impeller (2) is integrally provided with a plurality of back vanes (7), and at least one flushing flow channel (8) is formed in the pump cover (3), the inlet of the flushing flow channel (8) faces the outer edge of the back vane (7), and the outlet of the flushing flow channel (8) faces the mechanical seal (4); when the impeller (2) rotates, the back vane (7) rotates synchronously, thereby stirring the liquid flow at the mechanical seal (4), the liquid flow passes through the flushing flow channel (8) to flush the mechanical seal (4), and the back vane (7) discharges the liquid at the mechanical seal (4) through the centrifugal force. ​ 2. The small-sized self-priming pump with back vaneed impeller according to claim 1, characterized in that: The back vane (7) cooperates with the inner wall surface of the pump cover (3) and the flushing flow channel (8) to form a secondary impeller seal, which is used for sealing the high-pressure side liquid flow during operation and performing parking sealing with the mechanical seal (4).

3. The small-sized self-priming pump with back vaneed impeller according to claim 1, characterized in that: The back vanes (7) are uniformly distributed along the circumferential direction of the impeller (2).

4. The small-sized self-priming pump with back vaneed impeller according to claim 1, characterized in that: The mechanical seal (4) is a single-end mechanical seal.

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