CN220727213U - Axial flow type check valve for pump and multi-stage submersible pump thereof - Google Patents

Abstract

The utility model relates to the technical field of submersible pumps, and discloses an axial-flow check valve for a pump and a multistage submersible pump thereof, which comprises the following components: the valve comprises a check valve body, a valve cover, a valve rod, a stop pin and a check ring; the check valve body is provided with a first channel extending along the central axis, the valve rod penetrates through the first channel and is in sliding connection with the check valve body, and the valve cover is fixedly connected to the lower end of the valve rod and can move up and down relative to the check ring; the check valve body is provided with a second channel along the radial direction, one end of the second channel is communicated with the first channel, the stop pin penetrates through the second channel, an elastic component is connected between the stop pin and the check valve body and is used for driving the stop pin to move towards the direction of the first channel; the outer peripheral wall of the valve rod is provided with a stop groove matched with the stop pin, and the stop groove is positioned at one end of the valve rod far away from the valve cover. The utility model has the function of limiting the least unfavorable axial downward movement of the valve cover, and can fully ensure the operation safety of the pump rotor component and the submersible motor.

Description

Axial flow type check valve for pump and multi-stage submersible pump thereof

Technical Field

The utility model relates to the technical field of submersible pumps, in particular to an axial flow type check valve for a pump and a multistage submersible pump thereof.

Background

The multi-stage submersible pump is used as a general machine and is widely applied in various industrial fields, such as fields of underground petroleum lifting, sea water lifting auxiliary drilling of an ocean platform, sea filling, land making, vacuum preloading and precipitation, sea facility and island fire control, remote water delivery of hydraulic engineering, civil underground water lifting and drinking, agricultural reservoir river drainage and irrigation, garden sprinkling irrigation, hot spring bathing, urban, subway, mine, industrial and mining enterprise water supply and drainage and the like.

When the submersible pump is stopped in operation, liquid in the water outlet pipe network arranged on the check valve body can flow back into the pump to form a water hammer in the pipe network, and the geometric installation height of the pipe network, the inner diameter of the pipe network and the pressure of the liquid in the pipe network determine the water hammer force. Because of the requirements of application conditions, the impeller of the submersible pump can be installed to reach forty stages to enable the pump to obtain very high pressure lift, and the high pressure is combined with large geometric installation height and large pipe network inner diameter to cause exponential increase of water hammer force, and the water hammer force can reach tens of tons.

In the prior art, due to the defect of the check valve design, the check valve body is easy to erode and wear in the use process to fail and discard; particularly, after the pump is used for a long time and started and stopped for a plurality of times, the impact abrasion of the water hammer force can lead the size of the check ring arranged on the check valve body to be increased and the size of the check valve cover to be reduced. When the size of the check ring is larger than the limit size of the check valve cover or the size of the check valve cover is smaller than the limit size of the wear-resistant check ring, the axial downward movement size of the check valve cover exceeds a limit value, so that the check valve cover axially moves downward to exceed a value to impact the main shaft of the pump, the impeller and the submersible motor of the pump are damaged, and when serious, safety accidents are caused by falling and breakage of the submersible motor, the guide vanes and the main shaft, so that the safe and reliable operation and the service life of the multistage submersible pump are seriously reduced.

Disclosure of Invention

The purpose of the utility model is that: an axial-flow check valve with locking function for pump and its multi-stage submersible pump are disclosed.

In order to achieve the above object, the present utility model provides an axial flow check valve for a pump, comprising: the valve comprises a check valve body, a valve cover, a valve rod, a stop pin and a check ring; the upper end and the lower end of the check valve body are respectively provided with a water outlet and a water inlet, the water outlet is communicated with the water inlet, the check ring is annularly arranged at the water inlet, a first channel extending along the central axis of the check valve body is arranged on the check valve body, the valve rod penetrates through the first channel and is in sliding connection with the check valve body, and the valve cover is fixedly connected to the lower end of the valve rod and can move up and down relative to the check ring; when the valve cover moves to be abutted with the check ring, the water inlet is closed, and when the valve cover moves to be far away from the check ring, the water inlet is opened;

the check valve body is provided with a second channel along the radial direction, one end of the second channel is communicated with the first channel, the stop pin penetrates through the second channel, an elastic component is connected between the stop pin and the check valve body, and the elastic component is used for driving the stop pin to move towards the direction of the first channel; and a stop groove matched with the stop pin is formed in the peripheral wall of the valve rod, and the stop groove is positioned at one end of the valve rod, which is far away from the valve cover.

Further, the elastic component comprises a push rod, the push rod penetrates through the second channel and is located at one side, far away from the first channel, of the stop pin, a spring is connected between the push rod and the second channel, and the spring is used for driving the push rod to move towards the direction of the first channel.

Further, a screw hole is formed in the peripheral wall of the check valve body, one end, far away from the first channel, of the second channel is communicated to the periphery of the check valve body through the screw hole, and a first stud and a first retaining ring are installed at the screw hole.

Further, the elastic component comprises a plurality of stop pins, a plurality of elastic components and a plurality of second channels, and the stop groove is an annular groove.

Further, the device also comprises a screw, a second stud and a second retaining ring; the center shaft of valve gap has been seted up the connecting hole, connecting hole bottom end ring is equipped with the retaining groove, the valve rod from last down penetrate the connecting hole and pass through the connecting hole with valve gap threaded connection, the screw hole has been seted up to the bottom of valve rod, the screw from down upwards pass the connecting hole, and pass through the screw hole with the valve rod is connected, the second double-screw bolt from down upwards penetrate the connecting hole with the screw connection, the second retaining ring install in retaining groove department and with second double-screw bolt butt.

Further, a reflux concave disc is arranged at the top of the valve rod.

Further, the check valve body is internally provided with a guide rib extending along the axial direction and the radial direction, and the second channel penetrates through the guide rib.

The utility model also provides a multistage submersible pump, which comprises a final stage guide vane, a main shaft and the axial flow type check valve for the pump, wherein the main shaft is rotationally arranged on the central axis of the final stage guide vane, the check valve body is fixedly connected with the top end of the final stage guide vane, and the valve cover is arranged towards the main shaft.

Further, a balance disc is arranged at one end of the main shaft, which is close to the valve cover, and a balance cavity is formed in one side, which is far away from the valve cover, of the balance disc.

Further, in the axial direction of the spindle, a maximum distance between the balance disc and the valve cover is Imm, a minimum distance between the second channel and the valve cover is Jmm, and a minimum distance between the stop groove and the valve cover is Kmm, which satisfies: i > K-J.

Compared with the prior art, the axial flow type check valve for the pump and the multi-stage submersible pump thereof have the beneficial effects that:

the axial flow type check valve for the pump and the multistage submersible pump thereof are provided with the stop groove on the valve rod, and the check valve body is provided with the stop pin. When the pump is used for a long time, the size of the check ring on the check valve body can be increased and the size of the valve cover can be reduced due to impact abrasion, and the check ring can not clamp the valve cover well, so that the valve cover has an excessive downward movement condition; when the valve rod moves downwards in the application and the stop groove on the valve rod moves to the position where the first channel is intersected with the second channel, the stop pin enters the stop groove through the elastic component to limit the valve rod and the valve cover to move downwards, so that the impact on the main shaft is avoided, and the use safety of the multi-stage submersible pump is improved.

Drawings

FIG. 1 is a cross-sectional view of an axial flow check valve for a pump according to an embodiment of the present utility model;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

FIG. 3 is an enlarged schematic view at B in FIG. 1;

FIG. 4 is an enlarged schematic view at C in FIG. 1;

FIG. 5 is a cross-sectional view of a check valve body of an axial flow check valve for a pump according to an embodiment of the present utility model;

FIG. 6 is a cross-sectional view of a valve stem of an axial flow check valve for a pump according to an embodiment of the present utility model;

FIG. 7 is a cross-sectional view of a valve cover of an axial flow check valve for a pump according to an embodiment of the present utility model;

FIG. 8 is a cross-sectional view of a multi-stage submersible pump according to an embodiment of the utility model;

FIG. 9 is an enlarged schematic view at D in FIG. 8;

FIG. 10 is a cross-sectional view of a final stage impeller of a multi-stage submersible pump in accordance with an embodiment of the utility model.

In the figure, 41, the spindle; 45. a balancing disk; 451. a balancing chamber;

611. a last stage impeller; 65. a balance hole;

711. a last stage vane;

91. a check valve body; 911. a first channel; 912. a second channel; 913. a water outlet; 914. a water inlet; 915. a screw hole; 92. a check ring; 93. a stop pin; 94. a valve stem; 941. a stop groove; 942. a reflow concave plate; 943. screw holes; 95. a valve cover; 951. a connection hole; 952. a retaining groove; 96. an elastic component; 961. a push rod; 962. a spring; 971. a first stud; 972. a first stop ring; 973. a screw; 974. a second stud; 975. a second stop ring; 98. and a flow guiding rib.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the present utility model are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "connected," "fixed," and the like are used in the present utility model in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; the mechanical connection can be realized, and the welding connection can be realized; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The terms "first", "second", etc. are used in the present utility model to describe various information, but the information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the utility model.

As shown in fig. 1, 2 and 5, an axial flow check valve for a pump according to a preferred embodiment of the present utility model includes: a check valve body 91, a valve cap 95, a valve rod 94, a stopper pin 93 and a check ring 92; the upper end and the lower end of the check valve body 91 are respectively provided with a water outlet 913 and a water inlet 914, the water outlet 913 is communicated with the water inlet 914, the check ring 92 is annularly arranged at the water inlet 914, the check valve body 91 is provided with a first channel 911 extending along the central axis thereof, the valve rod 94 is arranged in the first channel 911 in a penetrating way and is in sliding connection with the check valve body 91, and the valve cover 95 is fixedly connected with the lower end of the valve rod 94 and can move up and down relative to the check ring 92; when the valve cover 95 moves to abut against the check ring 92, the water inlet 914 is closed, and when the valve cover 95 moves away from the check ring 92, the water inlet 914 is opened;

the check valve body 91 is provided with a second channel 912 along the radial direction, one end of the second channel 912 is communicated with the first channel 911, the stop pin 93 is arranged in the second channel 912 in a penetrating manner, an elastic component 96 is connected between the stop pin 93 and the check valve body 91, and the elastic component 96 is used for driving the stop pin 93 to move towards the direction of the first channel 911; the outer peripheral wall of the valve rod 94 is provided with a stop groove 941 matched with the stop pin 93, and the stop groove 941 is positioned at one end of the valve rod 94 away from the valve cover 95.

The valve rod 94 is provided with a stopper groove 941, and the check valve body 91 is provided with a stopper pin 93, and the stopper pin 93 has a movement tendency to move from the second passage 912 toward the first passage 911 on the valve rod 94 by the elastic member 96. When the pump is used for a long time, the check ring 92 on the check valve body 91 becomes large in size due to impact abrasion, the valve cover 95 becomes small in size, the check ring 92 cannot clamp the valve cover 95, and there is a case where the valve cover 95 excessively moves down. When the valve rod 94 moves downwards in the application, so that the stop groove 941 on the valve rod 94 moves to the position of the second channel 912, the stop pin 93 enters the stop groove 941 through the elastic component 96 to limit the valve rod 94 and the valve cover 95 to move downwards, thereby avoiding impacting the main shaft 41 and improving the use safety of the multi-stage submersible pump.

In some improvements of the present application, the elastic assembly 96 includes a push rod 961, where the push rod 961 is disposed through the second channel 912 and is located on a side of the stop pin 93 away from the first channel 911, a spring 962 is connected between the push rod 961 and the second channel 912, and the spring 962 is used to drive the push rod 961 to move toward the first channel 911.

In a normal state, one end of the stopper pin 93 in the second passage 912 abuts against the valve stem 94, the other end abuts against the spring 962, one end of the plunger 961 abuts against the peripheral wall of the check valve body 91, and the other end abuts against the spring 962 to compress the spring 962 together with the stopper pin 93. When the valve cap 95 moves the valve stem 94 downward so that the check groove is flush with the second channel 912, the stop pin 93 moves toward the check groove under the action of the spring 962, seizing the main valve stem 94 to prevent further downward movement of the valve stem 94.

As shown in fig. 3, in some modifications of the present application, a screw hole 915 is formed in the outer peripheral wall of the check valve body 91, one end of the second channel 912, which is far away from the first channel 911, is connected to the outer periphery of the check valve body 91 through the screw hole 915, and a first stud 971 and a first retaining ring 972 are installed at the screw hole 915. The spring 962 and the plunger 961 can be installed in the second channel 912 through the screw hole 915, and then the first stud 971 and the first retaining ring 972 are used to close the screw hole 915, so as to ensure the connection fastening.

In some modifications of the present application, including a plurality of the stop pins 93, a plurality of the elastic members 96, and a plurality of the second channels 912, the stop groove 941 is an annular groove. The plurality of stop pins 93 are annularly arranged on the periphery of the valve rod 94, and simultaneously move the main clamping annular stop groove 941 towards the center of the valve rod 94 during clamping, so that the valve rod 94 is prevented from moving downwards, and firm clamping is ensured.

As shown in fig. 4 and 7, in some modifications of the present application, a screw 973, a second stud 974, and a second stop 975 are further included; the center shaft of the valve cover 95 is provided with a connecting hole 951, the bottom end of the connecting hole 951 is provided with a retaining groove 952 in a ring, the valve rod 94 penetrates into the connecting hole 951 from top to bottom and is in threaded connection with the valve cover 95 through the connecting hole 951, the bottom end of the valve rod 94 is provided with a screw hole 943, the screw 973 penetrates through the connecting hole 951 from bottom to top and is connected with the valve rod 94 through the screw hole 943, the second stud 974 penetrates into the connecting hole 951 from bottom to top and is connected with the screw 973, and the second retaining ring 975 is installed at the position of the retaining groove 952 and is in butt joint with the second stud 974. This structure facilitates the installation between the valve cap 95 and the valve stem 94 and ensures that the connection is secured against falling off.

In some modifications of the present application, as shown in fig. 6, a reflux concave disc 942 is provided at the top of the valve rod 94. The return concave 942 is used to collect the return fluid when the water hammer is applied, so that the valve rod 94 drives the valve cover 95 to move axially downwards rapidly to achieve the effect of back flow check.

In some modifications of the present application, the check valve body 91 is provided with a flow guiding rib 98 extending in an axial direction and a radial direction, and the second channel 912 is disposed through the flow guiding rib 98. Specifically, the plurality of flow guiding ribs 98 are provided, and the second channels 912 are respectively provided on each flow guiding rib 98.

As shown in fig. 8, the embodiment of the utility model further provides a multi-stage submersible pump, which comprises a last-stage guide vane 711, a main shaft 41 and the axial-flow check valve for the pump, wherein the main shaft 41 is rotatably arranged on the central axis of the last-stage guide vane 711, the check valve body 91 is fixedly connected with the top end of the last-stage guide vane 711, and the valve cover 95 is arranged towards the main shaft 41.

As shown in fig. 9 and 10, in some modifications of the present application, a balancing disc 45 is disposed at an end of the main shaft 41 near the valve cover 95, and a balancing chamber 451 is disposed at a side of the balancing disc 45 far from the valve cover 95. Since the residual axial force generated by each impeller of the pump during operation acts on the submersible motor through the main shaft 41, the pump can damage the thrust bearing of the submersible motor during long-term operation. Therefore, the balance chamber 451 is arranged, and the balance hole 65 is formed in the impeller, so that after the axial force generated by the impeller of the pump during operation is balanced through the balance hole 65, the balance chamber 451 for balancing the axial force arranged on the main shaft 41 can completely balance the residual axial force, thereby improving the safe operation and the service life of the multi-stage submersible pump.

In some improvements of the present application, in the axial direction of the main shaft 41, the maximum distance between the balance disc 45 and the valve cover 95 is I, the minimum distance between the second channel 912 and the valve cover 95 is J, and the minimum distance between the retaining groove 941 and the valve cover 95 is K, so that: i > K-J. It is ensured that the valve cap 95 moves the valve rod 94 downwards until it hits the main shaft 41, and is blocked by the engagement of the stop pin 93 with the stop groove 941.

The installation process of the utility model is as follows:

the valve rod 94 is arranged in a connecting hole 951 on the valve cover 95 through threads arranged at the lower end of the valve rod 94, a screw 973 penetrates through the lower end of the connecting hole 951 and then is arranged in a screw hole 943 arranged on the valve rod 94 to further fix the valve cover 95 and the valve rod 94 together, a second stud 974 penetrates through the lower end of the connecting hole 951 upwards, the screw 973 is pressed after the screw is connected with the valve cover 95 through threads on the peripheral wall of the connecting hole 951, and a second retaining ring 975 is arranged in a retaining groove 952 at the lower end of the connecting hole 951 and then is matched with the second stud 974 to ensure that the screw 973 cannot loosen and withdraw to ensure firm and stable connection between the valve cover 95 and the valve rod 94. The valve rod 94 is installed in a first channel 911 arranged on the check valve body 91, the hub end surface arranged on the valve cover 95 is matched with the hole cover positioning surface arranged on the check valve body 91, the stop pin 93 is installed in a second channel 912 arranged on the check valve body 91 and matched with the valve rod 94, the spring 962 is installed in the second channel 912 arranged on the check valve body 91 and matched with the stop pin 93, the ejector rod 961 is installed in the second channel 912 arranged on the check valve body 91 and matched with the spring 962, the first stud 971 is installed in a screw hole 915 arranged on the check valve body 91 and matched with the ejector rod 961, the outer end of the screw hole 915 arranged on the check valve body 91 and matched with the first stud 971 ensure that the first stud 971 cannot loose and withdraw to enable the ejector rod 961, the spring 962 and the stop pin 93 to fall off; the check ring 92 is mounted on the last stage guide vane 711, and the check valve body 91 is mounted on the check ring 92, so that the mounting groove at the water inlet 914 of the check valve body 91 is matched with the check ring 92 and then fixed on the last stage guide vane 711.

In summary, the embodiment of the utility model provides an axial flow type check valve for a pump and a multi-stage submersible pump thereof, which have the function of limiting the least favorable axial downward movement of a valve cover 95, and can fully ensure the operation safety of a pump rotor component and a submersible motor; and the ability to fully balance the residual axial force ensures that the rotor component and the submersible motor are safe to operate without being subjected to any axial force.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims (10)

1. An axial flow check valve for a pump, comprising: the valve comprises a check valve body, a valve cover, a valve rod, a stop pin and a check ring; the upper end and the lower end of the check valve body are respectively provided with a water outlet and a water inlet, the water outlet is communicated with the water inlet, the check ring is annularly arranged at the water inlet, a first channel extending along the central axis of the check valve body is arranged on the check valve body, the valve rod penetrates through the first channel and is in sliding connection with the check valve body, and the valve cover is fixedly connected to the lower end of the valve rod and can move up and down relative to the check ring; when the valve cover moves to be abutted with the check ring, the water inlet is closed, and when the valve cover moves to be far away from the check ring, the water inlet is opened;

the check valve body is provided with a second channel along the radial direction, one end of the second channel is communicated with the first channel, the stop pin penetrates through the second channel, an elastic component is connected between the stop pin and the check valve body, and the elastic component is used for driving the stop pin to move towards the direction of the first channel; and a stop groove matched with the stop pin is formed in the peripheral wall of the valve rod, and the stop groove is positioned at one end of the valve rod, which is far away from the valve cover.

2. The axial flow check valve for a pump of claim 1, wherein the elastic assembly comprises a push rod penetrating through the second passage at a side of the stopper pin away from the first passage, and a spring is connected between the push rod and the second passage, and the spring is used for driving the push rod to move towards the direction of the first passage.

3. The axial flow check valve for pump of claim 2, wherein a screw hole is formed in the outer peripheral wall of the check valve body, one end of the second channel, which is far away from the first channel, is communicated to the outer periphery of the check valve body through the screw hole, and a first stud and a first retaining ring are installed at the screw hole.

4. The axial flow check valve for a pump of claim 1, comprising a plurality of said stopper pins, a plurality of said elastic members, and a plurality of said second passages, said stopper groove being an annular groove.

5. The axial flow check valve for a pump of claim 1, further comprising a screw, a second stud, a second check ring; the center shaft of valve gap has been seted up the connecting hole, connecting hole bottom end ring is equipped with the retaining groove, the valve rod from last down penetrate the connecting hole and pass through the connecting hole with valve gap threaded connection, the screw hole has been seted up to the bottom of valve rod, the screw from down upwards pass the connecting hole, and pass through the screw hole with the valve rod is connected, the second double-screw bolt from down upwards penetrate the connecting hole with the screw connection, the second retaining ring install in retaining groove department and with second double-screw bolt butt.

6. The axial flow check valve for a pump of claim 1, wherein the top of the valve stem is provided with a back flow recessed disc.

7. The axial flow check valve for pump as recited in claim 1, wherein said check valve body has axially and radially extending ribs therein, said second passage passing through said ribs.

8. A multistage submersible pump, characterized by comprising a last stage guide vane, a main shaft and the axial flow type check valve for pump according to any one of claims 1-7, wherein the main shaft is rotationally arranged on the central axis of the last stage guide vane, the check valve body is fixedly connected with the top end of the last stage guide vane, and the valve cover is arranged towards the main shaft.

9. The multi-stage submersible pump of claim 8, wherein a balance disc is provided at an end of the main shaft adjacent to the valve cover, and a balance chamber is provided at a side of the balance disc remote from the valve cover.

10. The multi-stage submersible pump of claim 9, wherein in the axial direction of the spindle, a maximum distance between the balance disc and the valve cover is Imm, a minimum distance between the second passage and the valve cover is Jmm, and a minimum distance between the stopper groove and the valve cover is Kmm, satisfying: i > K-J.