Pump body with self-suction function

Abstract

The invention 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 invention relates to the technical field of water pumps, in particular to a pump body with a self-priming function. Background Art

[0002] At present, the self-priming pump bodies promoted by the applicant on the market often have damage to the check valve mechanism. 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 technical research and development, the technicians also found that the self-priming effect of the pump body has room for further improvement. Summary of the invention

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

[0004] In order to solve the above technical problems, a pump body with a self-priming function is provided in the present invention, wherein the pump body comprises a pump casing having a water inlet hole, a water outlet hole and a main return water hole, a multi-stage impeller mechanism is arranged in the pump casing, a 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 of the multi-stage impeller mechanism are connected through a water inlet cavity; the check valve mechanism also comprises a check valve mechanism and a return water valve mechanism; the check valve mechanism comprises a check valve seat, the check valve seat is spirally connected 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 core are arranged on the check valve elastic member, a check valve elastic member Return valve nut, check valve sealing gasket, the check valve nut is spirally connected to the check valve core, one end of the check valve elastic member abuts on the check valve nut, and the other end abuts on the check valve seat; the return valve mechanism includes a drain plug, a return valve body with a sealing ring, and a return valve elastic member, the drain plug is spirally connected to the first orifice of the main return water hole, one end of the return valve elastic member is connected to the second orifice of the main return water hole, and the other end is connected to the return valve body, and the return valve body is used to open or close the tapered hole of the main return water hole; the water inlet is respectively connected to the water outlet hole and the auxiliary return water hole through the water outlet cavity.

[0005] Among them, a circle of water diversion holes is provided at the bottom of the annular shell of the multi-stage impeller mechanism, the water inlet is connected with the water diversion holes, and the water diversion holes are respectively connected with the water outlet hole and the auxiliary return water hole through the water outlet cavity.

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

[0007] The check valve core is in the shape of a mushroom head, the main stem of the mushroom head is inserted into the middle of the check valve seat, and the check valve sealing gasket provided on the left side of the mushroom head dome is blocked on the right side of the annular body under the tension of the check valve elastic part.

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

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

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

[0011] Wherein, the elastic member of the water return valve is a spring.

[0012] Compared with the prior art, the beneficial effect of the present invention is that the check valve mechanism is fixed to the water inlet hole of the pump body by means of threads, with a simple structure and easy disassembly and assembly; the water inlet cavity and the water outlet cavity are connected through the auxiliary return water hole, and the water inlet cavity and the water outlet cavity are connected or closed through the return water valve mechanism, thereby achieving a better self-priming operation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the pump body of the present invention;

[0014] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the pump body of the present invention;

[0015] Figure 3 It is a schematic diagram of the cross-sectional plan structure of the pump body of the present invention;

[0016] Figure 4 yes Figure 3 The enlarged structural diagram of the middle A part;

[0017] Figure 5 yes Figure 3 A schematic diagram of the enlarged structure of the middle B part;

[0018] Figure 6 It is a schematic diagram of a first partial cross-sectional three-dimensional structure of the pump body of the present invention;

[0019] Figure 7 It is a second partial cross-sectional stereoscopic structural schematic diagram of the pump body of the present invention. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

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

[0022] The check valve mechanism of this embodiment includes a check valve seat 16, which is an annular body 18 with a plurality of fan-shaped water holes 17. The outer periphery of the annular body has an external thread 19, which is spirally matched with the internal thread 20 on the water inlet hole. The check valve seat is provided with a movable check valve core 21, and the check valve core is provided with 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 sealing gasket 24. The check valve core is in the shape of a mushroom head, and the main rod 25 of the mushroom head is inserted into the middle of the check valve seat. The check valve sealing gasket provided on the right side of the mushroom head dome 26 is blocked on the left side of the annular body by the tension of the check valve elastic member. The outer diameters of the check valve sealing gasket and the mushroom head dome are both smaller than the outer diameter of the annular body. The outer diameters of the check valve sealing gasket and the mushroom head dome are both larger than the inner diameter of the annular body. The check valve nut is spirally connected 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.

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

[0024] When the pump body of the present embodiment is not working, the pressure in the water inlet cavity is the same as that in the water outlet cavity, and the check valve core, the check valve sealing gasket and the check valve seat are sealed together under the pulling force of the check valve elastic member to prevent the liquid in the water inlet cavity from flowing out of the water inlet hole; moreover, at this time, the return valve body is affected by the increased liquid pressure, and the return valve body will not be blocked on the tapered hole of the main return hole, thereby allowing the liquid in the water inlet cavity to communicate with the liquid in the water outlet cavity.

[0025] When the pump body starts to start self-priming work, water must be poured into the pump body until the water filling port overflows before the pump body starts (if there is water in the pump body, there is no need to fill it with water). Due to the action of the check valve mechanism, the water in the pump body will not flow out from the water inlet hole. The pump body starts, and 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, and the check valve core moves to the right under the action of force, and the gas in the water 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, and the elastic force of the elastic part of the return valve pushes the return valve body away from the tapered hole. At this time, the return valve body will not be blocked on the tapered 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, forms a gas-liquid mixture at the water inlet of the multi-stage impeller mechanism, and then enters the water outlet cavity through the action of the impeller. In the water outlet cavity, the gas and liquid are separated under the action of gravity, and the gas is discharged from the water outlet hole. The liquid flows into the water inlet cavity through the auxiliary return hole to form a cycle until the gas in the water inlet pipe is completely absorbed.

[0026] After the air in the water inlet pipe is completely sucked out, 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. The return valve body is pushed by the liquid pressure in the water outlet cavity to block the tapered hole of the main return hole, and the return valve body mechanism is closed, that is, the water outlet cavity and the water inlet cavity are separated.

[0027] The check valve mechanism of this embodiment is fixed to the water inlet hole of the pump body by means of threads, and has a simple structure and is easy to assemble and disassemble. The water inlet cavity is connected to the water outlet cavity through the auxiliary return hole, and the water inlet cavity and the water outlet cavity are connected or separated by the return valve mechanism to ultimately achieve a better self-priming operation effect.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

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

2. The pump body with self-priming function according to claim 1, characterized in that: The bottom of the annular shell of the multi-stage impeller mechanism is provided with a circle of water diversion holes, the water inlet is connected with the water diversion holes, and the water diversion holes are respectively connected with the water outlet hole and the auxiliary water return hole through the 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 plurality of fan-shaped water holes. The outer circle of the annular body has an external thread, and the external thread is spirally matched with the internal thread on the water inlet hole.

4. The pump body with self-priming function according to claim 3 is characterized in that: The check valve core is in the shape of a mushroom head, the main rod of the mushroom head is inserted into the middle of the check valve seat, and the check valve sealing gasket arranged on the left side of the mushroom head dome is blocked on the right side of the annular body under 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 sealing 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 sealing 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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