CN220185346U - Plunger valve for multi-head plunger pump - Google Patents

Abstract

The utility model discloses a plunger valve for a multi-head plunger pump, which comprises a valve body and a plunger arranged in the valve body, wherein a buffer structure is arranged at the joint of the plunger and the valve body, and when a channel of the valve body is opened or closed, fluid flows through and acts on the buffer structure so as to limit the fluid to impact the joint of the valve body at the plunger at the moment of opening and closing. The fluid acts directly on the cushioning structure or the fluid acts on the cushioning structure to slow down. The buffer structure is arranged at the joint of the plunger through the valve body, when the channel of the valve body is opened or closed, fluid flows through and acts on the buffer structure to limit the fluid to impact the connecting position of the valve body at the plunger at the moment of opening and closing, so that the service life of the plunger valve is prolonged.

Description

Plunger valve for multi-head plunger pump

Technical Field

The utility model relates to the technical field of valves, in particular to a plunger valve for a multi-head plunger pump.

Background

The existing plunger valve generally comprises a valve body, a valve rod, a plunger, a sealing ring and other parts. The valve rod drives the plunger to reciprocate up and down to finish the opening and closing functions of the valve. The plunger and the sealing ring are in interference fit in the valve, and the sealing performance is guaranteed by the sealing ring.

However, when the existing plunger valve is opened and closed, the flow velocity of fluid is large at the moment of opening or closing, which can cause impact on the wall surface of the valve cavity, particularly the blocking position (or connecting position) of the plunger and the valve cavity, for example, in a plunger pump for lubrication, the plunger valve used in the plunger valve is generally continuously opened and closed through the reciprocating action of a valve rod, so that the impact on the valve cavity is frequent, the service life is reduced, and the plunger valve needs to be frequently overhauled and replaced after a period of use.

Disclosure of Invention

The utility model aims to provide a plunger valve for a multi-head plunger pump with long service life.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the plunger valve for the multi-head plunger pump comprises a valve body and a plunger arranged in the valve body, wherein a buffer structure is arranged at the joint of the plunger and the valve body, and when a channel of the valve body is opened or closed, fluid flows through and acts on the buffer structure so as to reduce the impact of the fluid on the joint of the plunger and the valve body at the opening and closing moment.

Preferably, the fluid acts directly on the cushioning structure, or the fluid acts on the cushioning structure to slow down.

As a scheme of a preferable buffer structure, the inner cavity of the valve body is subjected to smooth transition treatment at the closed position of the plunger and forms a concave fillet to form the buffer structure, and fluid acts on the concave fillet at the opening and closing moment of the plunger to increase the acting area of the fluid at the opening and closing moment and change the flowing direction of the fluid.

As another preferable scheme of the buffer structure, a reserved groove is arranged in the closed position of the plunger in the inner cavity of the valve body, an annular sealing ring is assembled in the reserved groove to form the buffer structure, and fluid acts on the annular sealing ring at the opening and closing moment of the plunger.

Preferably, the inner side of the annular sealing ring is provided with a convex surface, and the convex surface is suitable for increasing the thickness of the annular sealing ring and increasing the acting area of fluid and the annular sealing ring; the reservation groove and the annular sealing ring respectively comprise a limit groove and a limit bulge, and the annular sealing ring is limited in the reservation groove through the cooperation of the limit groove and the limit bulge.

Further preferably, the valve body includes an upper portion and a lower portion, the pre-groove is formed on two bottom surfaces corresponding to the upper portion and the lower portion, and the annular sealing ring is clamped when the upper portion and the lower portion are fixedly installed, so that the valve body formed by assembly is closed at the joint.

Preferably, the plunger comprises a plunger body and a conical plunger head, a sealing ring is arranged at the joint of the plunger head and the plunger body, a conical portion is formed in an inner cavity of the valve body corresponding to the plunger head, the outer diameter of the plunger head is smaller than the inner diameter of the conical portion, and the outer diameter of the sealing ring is between the inner diameter of the top surface and the inner diameter of the bottom surface of the conical portion.

Further preferably, the plunger head is provided with a flow retarding assembly adapted to interfere with fluid flow when the plunger opens the fluid passageway so that the fluid is retarded when opened and closed.

Specifically, the slow flow component comprises a buffer groove formed in the plunger head along the conical surface direction of the plunger head, limiting rods are fixedly arranged at two ends of the buffer groove, slow flow plates are sleeved on the limiting rods, one ends of the slow flow plates extend out of the buffer groove, and when the plunger is opened and closed, fluid acts on the slow flow plates at the position of the plunger head, so that the fluid is resisted and decelerated during opening and closing.

Preferably, the slow flow assembly further comprises a third spring sleeved outside the limiting rod, the slow flow plate is fixedly connected with the third spring, and the slow flow plate is located in the middle of the buffer groove in an initial state.

Compared with the prior art, the utility model has the beneficial effects that:

the buffer structure is arranged at the joint of the plunger through the valve body, when the channel of the valve body is opened or closed, fluid flows through and acts on the buffer structure to limit the fluid to impact the connecting position of the valve body at the plunger at the moment of opening and closing, so that the service life of the plunger valve is prolonged.

Drawings

Fig. 1 is a schematic view of the overall structure of the present utility model.

Fig. 2 is a schematic cross-sectional view of the present utility model.

Fig. 3 is a schematic view of a valve body in a buffer configuration.

Fig. 4 is a schematic cross-sectional view of the valve body based on fig. 3 (hole sites are not shown due to angle problems).

FIG. 5 is a schematic cross-sectional view of the valve body of FIG. 4 with the addition of a convex surface.

FIG. 6 is a schematic view of a partially cut-away structure of the valve body with the addition of a slow flow mechanism.

Fig. 7 is a perspective view of the plunger in the state of fig. 6.

In the figure: 1. a valve body; 2. a first set of holes; 3. a second set of holes; 4. a first spring; 5. a valve stem connection portion; 6. a valve cone; 7. a second spring; 8. a plunger; 81. a plunger body; 9. a water outlet; 10. a seal ring; 11. an action part; 12. a water inlet; 13. a valve stem; 14. reserving a groove; 15. concave fillets; 16. a fixed mounting part; 17. an annular seal ring; 171. a convex surface; 18. a slow flow component; 181. a limit rod; 182. a third spring; 184. and a slow flow plate.

Detailed Description

The present utility model will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.

In the description of the present utility model, it should be noted that, for the azimuth words such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present utility model that the device or element referred to must have a specific azimuth configuration and operation.

It should be noted that the terms "first," "second," and the like in the description and in the claims are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

The terms "comprises" and "comprising," along with any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Examples:

referring to fig. 1-7, the present embodiment provides a plunger 8 valve for a multi-head plunger 8 pump, which comprises a valve body 1, wherein a valve rod 13, a plunger 8 and a valve cone 6 are arranged in the valve body 1, wherein the outer end of the valve rod 13 is a valve rod connecting part 5, and is connected with a driving part through the valve rod connecting part 5, the driving part enables the valve rod 13 to reciprocate in an inner cavity of the valve body 1, and the valve rod 13 acts on the plunger 8, so that the plunger 8 is regulated through the valve rod 13. In this embodiment, the plunger 8 comprises a tapered plunger head 81 as shown in fig. 2, and the valve cavity of the valve body 1 is shown in fig. 2 or fig. 4 (wherein the cutting directions of fig. 4 and fig. 2 are different, and therefore the water outlet 9 and the water inlet 12 are not shown), the middle part of the valve cavity is tapered, the valve cavity of this part is matched with the tapered plunger head 81, thus a tapered fluid channel is formed, this channel is blocked by the O-ring 10, an annular groove is formed above the plunger head 81 of the plunger 8 for mounting the O-ring 10, the outer diameter of the O-ring 10 is smaller than the inner diameter of the top surface of the tapered part in the valve cavity, but larger than the inner diameter of the bottom surface of the tapered part, and thus the tapered part of the valve cavity is necessarily pressed and sealed when the plunger 8 moves downwards, and the fluid channel is opened when moving upwards. How the plunger 8 moves up and down is common knowledge in the art, and thus will not be described in detail. In this embodiment, preferably, a first spring 4 is disposed between the top of the plunger 8 and the bottom of the valve cone 6, the first spring 4 seals the plunger 8 tightly against the conical portion of the valve cavity in an initial state, when the valve rod 13 moves up, the acting portion 11 of the valve rod pushes the plunger 8 open to open the fluid channel, and when the valve rod 13 moves down, the first spring 4 resets to seal the fluid channel by the plunger 8. The plunger valve has a first hole group (lower) 2 and a second hole group 3 (upper), in the description of this embodiment, the first hole group 2 is a water outlet 9, the second hole group 3 is a water inlet, and the first hole group 2 and the second hole group 3 include a plurality of holes, which is suitable for a multi-head plunger pump.

Since the fluid is easy to generate the water hammer effect when the plunger 8 is opened and closed, the plunger 8 valve for the plunger 8 pump is usually used in a reciprocating motion, the use frequency is high, so that the impact caused by the opening and closing of the water flow has a large impact effect on the inner wall of the valve body 1, particularly the wall surface where the plunger 8 is located, and the service life of the valve body 1 can be influenced by the impact effect after long time, in this embodiment, the valve body 1 is provided with a buffer structure (mainly at the joint of the plunger head 81) at the joint of the plunger 8, and when the channel of the valve body 1 is opened or closed, the fluid flows through and acts on the buffer structure to reduce the impact of the fluid on the joint of the valve body 1 at the plunger 8 at the opening and closing moment so as to improve the service life of the plunger valve.

Two preferred modes of cushioning for the cushioning structure are provided below: the fluid directly acts on the buffer structure, namely the buffer structure replaces part of the wall surface of the valve body 1 to receive the impact of the fluid; or the fluid is decelerated after acting on the buffer structure, thereby reducing the loss, and the specific structure of the two preferred buffer structures is described below.

In one of them, referring to fig. 2, the inner cavity of the valve body 1 is smoothly transited at the closing position of the plunger 8 and forms a concave fillet 15 to form a buffer structure, fluid acts on the concave fillet 15 at the opening and closing moment of the plunger 8 to increase the acting area of the fluid at the opening and closing moment and change the flowing direction of the fluid, as shown in fig. 2, the concave fillet 15 is arranged at the top of the conical part of the valve cavity, for example, when the plunger 8 moves upwards from the state of fig. 2, the instantaneous water flow enters from the water inlet 12 at the bottom and is discharged from the water outlet 9 at the top, the flow velocity is large when the plunger passes through the conical part at the opening moment, the fluid impacts the inner wall of the valve body 1 at the top of the conical part, and the fluid impacts with a larger contact area when the concave fillet 15 is arranged, and is guided through the concave fillet 15 and then discharged through the water outlet 9, and the impact action of the fluid is weakened when the valve is opened and closed after the guiding process.

In another buffering structure of the embodiment, a reserved groove 14 is arranged in the inner cavity of the valve body 1 at the closed position of the plunger 8, an annular sealing ring 17 is assembled in the reserved groove 14 to form the buffering structure, and fluid acts on the annular sealing ring 17 at the opening and closing moment of the plunger 8. When the plunger 8 is opened and closed, fluid can impact the annular sealing ring 17, the annular sealing ring 17 is low in cost, rubber materials can be selected, the wear resistance and impact resistance are good, even if the annular sealing ring 17 is damaged, the problem can be solved by only replacing the sealing ring, so that the service life of the valve body 1 is prolonged better, as shown in fig. 3-5, under the buffer structure, the valve body 1 is preferably split, and of course, the valve body is also split and is easy to assemble and disassemble.

The inner side of the annular sealing ring 17 is provided with a drawing 171, and the drawing 171 is suitable for increasing the thickness of the annular sealing ring 17 and increasing the acting area of fluid and the annular sealing ring 17, so that the service life of the annular sealing ring 17 can be prolonged; the reserved groove 14 and the annular sealing ring 17 respectively comprise a limit groove and a limit bulge, the annular sealing ring 17 is limited in the reserved groove 14 through the cooperation of the limit groove and the limit bulge, as shown in fig. 5, the cross section of the annular sealing ring 17 in fig. 5 is in a T shape, the limit bulge is obvious, the inner wall of the valve body 1 is provided with the limit groove, and the annular sealing ring 17 is installed through the limit function, so that the stability is ensured.

In this embodiment, the valve body 1 includes an upper portion and a lower portion, and the reserved grooves 14 are formed on two bottom surfaces corresponding to the upper portion and the lower portion, and the annular seal ring 17 is clamped when the upper portion and the lower portion are fixedly installed, so that the valve body 1 formed by assembly is closed at the joint; when the annular sealing ring 17 is installed and disassembled, the upper part and the lower part are only required to be opened, the annular sealing ring 17 is extracted and replaced by a new one; the upper and lower parts are mounted with reference to fig. 5, and the upper and lower parts are provided with the fixed mounting parts 16, and the fixed mounting parts 16 of the upper and lower parts are fastened by screws, and the ring-shaped sealing ring 17 can simultaneously ensure tightness after mounting.

As shown in fig. 6 and 7, the plunger head 81 is provided with a flow retarding assembly 18, and the flow retarding assembly 18 is adapted to interfere with the flow of fluid when the plunger 8 opens the fluid passage, so that the fluid is retarded when opening and closing.

Specifically, the flow-retarding component 18 includes a buffer slot formed by the plunger head 81 along the conical surface direction thereof, the two ends of the buffer slot are fixedly provided with a stop lever 181, the stop lever 181 is sleeved with a flow-retarding plate 184, one end of the flow-retarding plate 184 extends out of the buffer slot, when the plunger 8 is opened and closed, fluid acts on the flow-retarding plate 184 at the position of the plunger head 81, so that the fluid is resisted and decelerated during opening and closing, and when the plunger 8 is opened and closed, because a part of the flow-retarding plate 184 is in a conical channel formed by the plunger head 81 and the valve cavity, during opening, the fluid acts on the flow-retarding plate 184, the flow-retarding plate 184 can correspondingly slide on the stop lever 181, thereby blocking the fluid, so that the opening or closing moment is blocked, and the speed of the larger fluid is reduced, thereby reducing the impact. Therefore, the slow flow component 18 can work normally and has a better impact reduction effect under the two buffer structures provided by the embodiment.

In order to increase the slow flow effect of the slow flow assembly 18, the slow flow assembly 18 further comprises a third spring 183 sleeved outside the limiting rod 181, the slow flow plate 184 is fixedly connected with the third spring 183, the slow flow plate 184 is located in the middle of the buffer groove in an initial state, when the plunger 8 is opened or closed, fluid acts on the slow flow plate 184, the slow flow plate 184 compresses or stretches the spring, deformation of the spring is a means for buffering fluid impact during opening and closing, and therefore the impact resistance can be effectively increased.

The foregoing has outlined the basic principles, features, and advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. The plunger valve for the multi-head plunger pump comprises a valve body and a plunger arranged in the valve body, and is characterized in that a buffer structure is arranged at the joint of the plunger and is acted by fluid when the fluid flows through a channel of the valve body when the channel of the valve body is opened or closed, so that the impact of the fluid on the joint of the plunger and the valve body is reduced.

2. A plunger valve for a multi-headed plunger pump as set forth in claim 1 wherein said passageway of said valve body is opened or closed by fluid either directly acting on said buffer structure or by fluid decelerating after passing through said buffer structure.

3. A plug valve for a multi-headed plunger pump as set forth in claim 2 wherein said interior cavity of said valve body is smoothly transition treated and formed with concave rounded corners at said closed position of said plunger to form said cushioning structure, fluid acting on said concave rounded corners at said opening and closing instants of said plunger to increase the opening and closing instant fluid area and change the direction of fluid flow.

4. A plug valve for a multi-headed plunger pump as set forth in claim 2 wherein said interior cavity of said valve body defines a recess in said closed position of said plunger, said recess being fitted with an annular seal to form said buffer structure, fluid acting upon said annular seal at the instant of opening and closing said plunger.

5. The plug valve for a multi-headed plunger pump as set forth in claim 4, wherein said annular seal ring has a convex surface on its inner side, said convex surface being adapted to increase the thickness of said annular seal ring and to increase the area of fluid interaction with said annular seal ring; the reservation groove and the annular sealing ring respectively comprise a limit groove and a limit bulge, and the annular sealing ring is limited in the reservation groove through the cooperation of the limit groove and the limit bulge.

6. The plunger valve for a multi-head plunger pump according to claim 5, wherein said valve body comprises an upper portion and a lower portion, said pre-groove is formed on two bottom surfaces corresponding to said upper portion and said lower portion, said upper portion and said lower portion being fixedly mounted so as to clamp said annular seal ring, so that said valve body formed by assembly is closed at a joint.

7. A plunger valve for a multi-head plunger pump according to any one of claims 1 to 6, wherein said plunger comprises a plunger body and a tapered plunger head, a sealing ring is provided at the junction of said plunger head and said plunger body, a tapered portion is formed in the inner cavity of said valve body corresponding to said plunger head, the outer diameter of said plunger head is smaller than the inner diameter of said tapered portion, and the outer diameter of said sealing ring is between the inner diameter of the top surface and the inner diameter of the bottom surface of said tapered portion.

8. A plunger valve for a multi-headed plunger pump as set forth in claim 7 wherein said plunger head is provided with a flow retarding assembly adapted to interfere with fluid flow when said plunger opens the fluid passageway so that the fluid is retarded upon opening and closing.

9. The plunger valve for a multi-head plunger pump according to claim 8, wherein the flow slowing assembly comprises a buffer groove formed in the plunger head along the conical surface direction of the plunger head, limiting rods are fixedly arranged at two ends of the buffer groove, flow slowing plates are sleeved on the limiting rods, one ends of the flow slowing plates extend out of the buffer groove, and when the plunger is opened and closed, fluid acts on the flow slowing plates at the position of the plunger head, so that the fluid is resisted and decelerated during opening and closing.

10. The plunger valve for a multi-head plunger pump according to claim 9, wherein the slow flow assembly further comprises a third spring sleeved outside the limiting rod, the slow flow plate is fixedly connected with the third spring, and the slow flow plate is located in the middle of the buffer groove in an initial state.