Pump body with self-suction function

Abstract

The utility model discloses a pump body with a self-suction function, and relates to the technical field of water pumps, the pump body comprises a pump shell, a multi-stage impeller mechanism is arranged in the pump shell, a rotating shaft on the multi-stage impeller mechanism is driven by a motor, and a water inlet hole, a main water return hole and a water inlet of the multi-stage impeller mechanism are communicated through a water inlet cavity; the device further comprises a check valve mechanism and a water return valve mechanism. The check valve mechanism comprises a check valve seat, the check valve seat is in spiral connection with the water inlet hole, a movable check valve element is arranged on the check valve seat, a check valve elastic piece, a check valve nut and a check valve sealing gasket are arranged on the check valve element, the check valve nut is in spiral connection with the check valve element, one end of the check valve elastic piece abuts against the check valve nut, and the other end of the check valve elastic piece abuts against the check valve sealing gasket. The other end of the spring abuts against the check valve seat; and the water inlet is respectively communicated with the water outlet hole and the auxiliary water return hole through the water outlet cavity. The check valve mechanism is convenient to disassemble and assemble; and a better self-suction operation effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, and particularly to a pump body with a self-priming function. Background Art

[0002] At present, the check valve mechanisms of the self-priming pump bodies sold by the applicant on the market often get damaged. Since these check valve mechanisms are fixedly installed on the pump body, it is very time-consuming and laborious for technicians to disassemble and assemble them during after-sales service. At the same time, during the process of technological research and development by technicians, it is also found that there is still room for further improvement in the self-priming effect of the pump body. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a pump body with a self-priming function, so as to overcome the defects that the disassembly and assembly of the check valve mechanism of the pump body in the prior art are time-consuming and laborious and the self-priming effect is relatively unsatisfactory.

[0004] To solve the above technical problem, the pump body with a self-priming function of the utility model, the pump body includes a pump shell having a water inlet hole, a water outlet hole, and a main water return hole. A multi-stage impeller mechanism is arranged in the pump shell, and the rotating shaft on the multi-stage impeller mechanism is driven by a motor. The water inlet hole, the main water return hole, and the water inlet of the multi-stage impeller mechanism are communicated through a water inlet cavity. It also includes a check valve mechanism and a water return valve mechanism. The check valve mechanism includes a check valve seat, which is screwed to the water inlet hole. A movable check valve core is arranged on the check valve seat. A check valve elastic member, a check valve nut, and a check valve gasket are arranged on the check valve core. The check valve nut is screwed to the check valve core. One end of the check valve elastic member abuts against the check valve nut, and the other end abuts against the check valve seat. The water return valve mechanism includes a drain plug, a water return valve body with a sealing ring, and a water return valve elastic member. The drain plug is screwed to the first hole of the main water return hole. One end of the water return valve elastic member is connected to the second hole of the main water return hole, and the other end is connected to the water return valve body. The water return valve body is used to open or close the tapered hole of the main water return hole. The water inlet is communicated with the water outlet hole and the secondary water return hole respectively through a water outlet cavity.

[0005] Wherein, a circle of water distribution holes is arranged at the bottom of the annular shell of the multi-stage impeller mechanism. The water inlet is communicated with the water distribution holes, and the water distribution holes are communicated with the water outlet hole and the secondary water return hole respectively through a water outlet cavity.

[0006] Wherein, the check valve seat is an annular body with a plurality of fan-shaped water holes. The outer circle of the annular body has an external thread, and the external thread is in spiral fit with the internal thread on the water inlet hole.

[0007] Among them, the check valve spool is in the shape of a mushroom head. The main rod of the mushroom head passes through the middle of the check valve seat, and the check valve gasket provided on the left side of the mushroom head dome is blocked on the right side of the annular body under the influence of the tension of the check valve elastic member.

[0008] Among them, the outer diameters of both the check valve gasket and the mushroom head dome are smaller than the outer diameter of the annular body.

[0009] Among them, the outer diameters of both the check valve gasket and the mushroom head dome are larger than the inner diameter of the annular body.

[0010] Among them, the check valve elastic member is a spring.

[0011] Among them, the return water valve elastic member is a spring.

[0012] Compared with the prior art, the beneficial effect of the present utility model is that the check valve mechanism is fixed on the water inlet hole of the pump body in the form of a thread, with a simple structure and convenient disassembly and assembly; the water inlet cavity and the water outlet cavity are communicated through the secondary return water hole, and the water inlet cavity and the water outlet cavity are connected or closed through the return water valve mechanism, finally achieving a better self-priming operation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a three-dimensional structural schematic diagram of the pump body of the present utility model;

[0014] Figure 2 is a three-dimensional sectional structural schematic diagram of the pump body of the present utility model;

[0015] Figure 3 is a sectional plane structural schematic diagram of the pump body of the present utility model;

[0016] Figure 4 is Figure 3 an enlarged structural schematic diagram of part A in

[0017] Figure 5 is Figure 3 an enlarged structural schematic diagram of part B in

[0018] Figure 6 is a first partial sectional three-dimensional structural schematic diagram of the pump body of the present utility model;

[0019] Figure 7 is a second partial sectional three-dimensional structural schematic diagram of the pump body of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0021] The pump body of this embodiment is as shown in Figures 1 to 7As shown in the figure, the pump body includes a pump housing 4 having a water inlet hole 1, a water outlet hole 2, and a main return water hole 3, and further includes a check valve mechanism 5 and a return water valve mechanism 6. A multi-stage impeller mechanism 7 is provided inside the pump housing. The multi-stage impeller mechanism includes an annular housing 8, a rotating shaft 9, and an impeller 10. The rotating shaft on the multi-stage impeller mechanism is driven by a motor. The water inlet hole, the main return water hole, and the water inlet 11 of the multi-stage impeller mechanism are connected and communicated through a water inlet cavity 12. A circle of water distribution holes 13 are provided at the bottom of the annular housing of the multi-stage impeller mechanism. The water distribution holes are respectively connected and communicated with the water outlet hole and the secondary return water hole 15 through a water outlet cavity 14.

[0022] In this embodiment, the check valve mechanism includes a check valve seat 16. The check valve seat is an annular body 18 having a plurality of fan-shaped water holes 17. The outer circle of the annular body has an external thread 19, and the external thread is in spiral fit with the internal thread 20 on the water inlet hole. A movable check valve core 21 is provided on the check valve seat. A check valve elastic member 22 (the check valve elastic member in this embodiment is a spring), a check valve nut 23, and a check valve gasket 24 are provided on the check valve core. The check valve core is in the shape of a mushroom head. The main rod 25 of the mushroom head penetrates through the middle of the check valve seat. The check valve gasket provided on the right side of the mushroom head dome 26 is blocked on the left side of the annular body under the influence of the pulling force of the check valve elastic member. The outer diameters of the check valve gasket and the mushroom head dome are both smaller than the outer diameter of the annular body. The outer diameters of the check valve gasket and the mushroom head dome are both larger than the inner diameter of the annular body. The check valve nut is in spiral connection with the check valve core. One end of the check valve elastic member abuts against the check valve nut, and the other end abuts against the check valve seat.

[0023] In this embodiment, the return water valve mechanism includes a drain plug 27 with a screw hole, a return water valve body 29 with a sealing ring 28, and a return water valve elastic member 30 (the return water valve elastic member in this embodiment is a spring). The drain plug is in spiral connection with the first hole 31 of the main return water hole. One end of the return water valve elastic member is connected to the second hole 32 of the main return water hole, and the other end is connected to the return water valve body. The return water valve body is used to open or close the tapered hole 34 of the main return water hole.

[0024] When the pump body in this embodiment is not working, the pressures in the water inlet cavity and the water outlet cavity are the same. Under the action of the pulling force of the check valve elastic member, the check valve core, the check valve gasket and the check valve seat are fitted and sealed to prevent the liquid in the water inlet cavity from flowing out of the water inlet hole. Moreover, at this time, due to the influence of the increase in liquid pressure, the return water valve body will not block the tapered hole of the main return water hole, so that the liquid in the water inlet cavity and the water outlet cavity is communicated.

[0025] When the pump body starts to start the self-priming operation, before the pump body starts, it is necessary to fill the pump body with water until the water overflows from the water filling port (if there is water in the pump body, there is no need to fill it again). Due to the function of the check valve mechanism, the water in the pump body will not flow out from the water inlet hole. When the pump body starts, under the action of the multi-stage impeller mechanism, the liquid in the pump body flows from the water inlet cavity to the water outlet cavity, the pressure in the water inlet cavity decreases, the check valve spool moves to the right under the action of force, and the gas in the inlet pipe enters the water inlet cavity. Since the water inlet cavity sucks in gas, the pressure of the liquid in the water outlet cavity is insufficient. Coupled with the elastic force of the return valve elastic part pushing the return valve body away from the conical hole, at this time, the return valve body will not block the conical hole of the main return hole, and the liquid in the water outlet cavity flows into the water inlet cavity from the auxiliary return hole to form a gas-liquid mixture at the water inlet of the multi-stage impeller mechanism and then enters the water outlet cavity through the impeller action. In the water outlet cavity, the gas-liquid separation occurs under the action of gravity, the gas is discharged from the water outlet hole, and the liquid flows into the water inlet cavity through the auxiliary return hole to form a cycle until the gas in the inlet pipe is sucked out completely.

[0026] After the gas in the inlet pipe is sucked out completely, the pump body starts to work normally. At this time, the liquid pressure in the water outlet cavity is greater than the liquid pressure in the water inlet cavity. Affected by the liquid pressure in the water outlet cavity, the return valve body blocks the conical hole of the main return hole, and the return valve body mechanism closes, that is, the water outlet cavity and the water inlet cavity are separated.

[0027] In this embodiment, the check valve mechanism is fixed on the water inlet hole of the pump body in the form of a thread, with a simple structure and convenient disassembly and assembly; the water inlet cavity and the water outlet cavity are connected through the auxiliary return hole, and the connection or separation of the water inlet cavity and the water outlet cavity is realized through the return valve mechanism, and finally a better self-priming operation effect is achieved.

[0028] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A pump body with a self-priming function, the pump body includes a pump housing having a water inlet hole, a water outlet hole, and a main water return hole, a multi-stage impeller mechanism is provided in the pump housing, the rotating shaft on the multi-stage impeller mechanism is driven by a motor, and the water inlet hole, the main water return hole, and the water inlet of the multi-stage impeller mechanism are connected through a water inlet cavity; It is characterized in that: It also includes a check valve mechanism and a water return valve mechanism; the check valve mechanism includes a check valve seat, which is screwed to the water inlet hole, a movable check valve core is provided on the check valve seat, a check valve elastic member, a check valve nut, and a check valve gasket are provided on the check valve core, the check valve nut is screwed to the check valve core, one end of the check valve elastic member abuts against the check valve nut, and the other end abuts against the check valve seat; The water return valve mechanism includes a drain plug, a water return valve body with a sealing ring, and a water return valve elastic member. The drain plug is screwed to the first orifice of the main water return hole. One end of the water return valve elastic member is connected to the second orifice of the main water return hole, and the other end is connected to the water return valve body. The water return valve body is used to open or close the tapered hole of the main water return hole; The water inlet is connected to the water outlet hole and the auxiliary water return hole respectively through a water outlet cavity.

2. The pump body with self-priming function according to claim 1, characterized in that: A circle of water distribution holes is provided at the bottom of the annular housing of the multi-stage impeller mechanism. The water inlet is connected to the water distribution holes, and the water distribution holes are connected to the water outlet hole and the auxiliary water return hole respectively through a water outlet cavity.

3. The pump body with self-priming function according to claim 1 or 2, characterized in that: The check valve seat is an annular body with a number of fan-shaped water holes. The outer circle of the annular body has an external thread, and the external thread is helically engaged with the internal thread on the water inlet hole.

4. The pump body with self-priming function according to claim 3, characterized in that: The check valve core is in the shape of a mushroom head. The main rod of the mushroom head passes through the middle of the check valve seat. The check valve gasket provided on the left side of the mushroom head dome is blocked on the right side of the annular body under the influence of the pulling force of the check valve elastic member.

5. The pump body with self-priming function according to claim 4, characterized in that: The outer diameters of the check valve gasket and the mushroom head dome are both smaller than the outer diameter of the annular body.

6. The pump body with self-priming function according to claim 5, characterized in that: The outer diameters of the check valve gasket and the mushroom head dome are both larger than the inner diameter of the annular body.

7. The pump body with self-priming function according to claim 1 or 2, characterized in that: The check valve elastic member is a spring.

8. The pump body with self-priming function according to claim 1 or 2, characterized in that: The water return valve elastic member is a spring.

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