CN216518442U

CN216518442U - Pump head of plunger pump

Info

Publication number: CN216518442U
Application number: CN202123177205.1U
Authority: CN
Inventors: 陈亨俭
Original assignee: Taizhou Mingyu Electromechanical Co ltd
Current assignee: Taizhou Mingyu Electromechanical Co ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-05-13
Anticipated expiration: 2031-12-16

Abstract

The utility model relates to a pump head of a plunger pump, which comprises a crankcase and a cylinder body; the crankshaft is connected with each plunger through a split type connecting rod, so that when the crankshaft rotates, the crankshaft can drive each plunger to reciprocate in the mounting hole through the split type connecting rod; the cylinder body is detachably and hermetically connected with the crankcase, a plurality of water inlet and outlet channels which are correspondingly communicated with the mounting holes one by one are arranged on the cylinder body, and a water inlet and outlet valve is arranged at an inlet and an outlet of each water inlet and outlet channel; the split connecting rod can be disassembled to allow the crankshaft to be disengaged. This application has the advantage that increases plunger life, reduces the plunger installation degree of difficulty.

Description

Pump head of plunger pump

Technical Field

The utility model relates to the technical field of plunger pumps, in particular to a pump head of a plunger pump.

Background

Plunger pumps are an important device of hydraulic systems. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity so as to absorb and press oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like, and is widely applied to occasions with high pressure, large flow and flow needing regulation, such as hydraulic machines, engineering machinery and ships. The plunger pump is an important device of the hydraulic system. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity so as to absorb and press oil.

The existing crankshaft plunger pump drives a crankshaft to rotate through a motor, so that a plunger is driven to reciprocate in a cylinder body. However, at present, a crankshaft of the crankshaft plunger pump is not usually connected with a plunger, the plunger rebounds through a spring, and the service life of the spring is sharply reduced along with the continuous use of the plunger pump, so that the service life of the crankshaft plunger pump is short.

Therefore, a pump head for a plunger pump that can significantly increase the service life of the plunger pump is desired.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems in the prior art and provides a pump head of a plunger pump.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: a plunger pump head comprises a crankcase and a cylinder block; the crankshaft is connected with each plunger through a split type connecting rod, so that when the crankshaft rotates, the crankshaft can drive each plunger to reciprocate in the mounting hole through the split type connecting rod; the cylinder body is detachably and hermetically connected with the crankcase, a plurality of water inlet and outlet channels which are in one-to-one correspondence communication with the mounting holes are arranged on the cylinder body, and a water inlet and outlet valve is arranged at an inlet and an outlet of each water inlet and outlet channel; the split connecting rod is detachable so as to disconnect the crankshaft.

The working principle and the beneficial effects are as follows: 1. compared with the prior art, the split type connecting rod is adopted to replace a traditional spring, so that the problem that the service life of the plunger pump is reduced due to the reduction of the service life of the spring is solved;

2. compared with the prior art, split type connecting rod is selected for use in this application, because it can dismantle separately, compares the assembly that the integral type connecting rod can adapt to bigger stroke, bigger eccentric wheel radius and more powerful bent axle, and the compatibility is better.

Furthermore, each split type connecting rod comprises a first connecting rod and a second connecting rod detachably connected with the first connecting rod, inner rings of the first connecting rod and the second connecting rod are mutually spliced to form a complete circle, so that the first connecting rod and the second connecting rod can be matched with the outer contour of a circular shaft part of the crankshaft, and the circular shaft part is positioned between two adjacent eccentric wheels of the crankshaft. This setting is through installing first connecting rod and second connecting rod between two eccentric wheels of bent axle, so through the bent axle of compatible different stroke, different eccentric wheel radius and different power, as long as with the inner circle matching of axle shaft part design with first second connecting rod can, can change moreover, this is that current integral type connecting rod can't accomplish.

Further, the second connecting rod is rotatably connected with the plunger pump through a connecting rod pin. The plunger pump can be conveniently connected by the arrangement, and the structure is simple.

Furthermore, the connecting rod and the connecting rod pin and the plunger and the connecting rod pin are in clearance fit, and the connecting rod pin is limited through a limit boss on the inner side of the crankcase. The arrangement enables lubricating oil to form a lubricating oil film in the gap more easily, so that abrasion among fittings under high stress is reduced, and the condition that the crankcase is damaged due to the fact that the connecting rod pin moves left and right can be effectively prevented as long as the connecting rod pin is tightly jacked in the hole of the plunger through a common set screw.

Further, each split type connecting rod corresponds to one round shaft part, and the width of each split type connecting rod is equal to or approximately equal to the length of the corresponding round shaft part.

The arrangement enables the split connecting rod to bear larger force in the operation process by widening the split connecting rod.

Furthermore, an oil guide groove communicated with the position of the connecting rod pin is formed in the second connecting rod.

This setting leads the oil groove and can offset because of the connecting rod widens thereby the degree of difficulty that forms the lubricating oil film between split type connecting rod and the bent axle.

Further, the plunger includes plunger seat, ceramic pipe and locking screw, the locking screw passes the ceramic pipe inside with plunger seat spiro union, the ceramic pipe with be equipped with the copper gasket between the plunger seat, the locking screw with be equipped with the sealing washer between the locking screw, just the external diameter of copper gasket is greater than the ceramic pipe with the external diameter of plunger seat.

This setting provides a simple structure and long service life's plunger, and this plunger can keep and mounting hole between sliding connection through the copper gasket, so both can reduce area of contact, improves the smooth and easy degree of plunger motion, can also protect ceramic pipe to be difficult to the pipe explosion because ceramic pipe can not with the mounting hole inner wall contact.

Furthermore, a water guide groove is formed in the copper gasket. When the sealing ring between the locking screw and the ceramic tube is damaged under the pressure of high-pressure water, the high-pressure water pressure leaked into the ceramic tube through the damaged sealing ring can be discharged through the water chute, so that the ceramic tube is prevented from being burst by the high pressure existing on the inner side of the ceramic tube.

Further, a cylindrical roller bearing is arranged between the crankshaft and the mounting through hole. Compare traditional deep groove ball bearing, adopt cylindrical roller bearing to bear higher rated load to make this pump head output higher pressure.

Further, the crankcase and the cylinder body are fixed through a connecting piece.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is an enlarged view of A in FIG. 2;

FIG. 4 is an exploded view of the plunger;

fig. 5 is a cross-sectional view of the crankcase.

In the figure, 1, crankcase; 2. a cylinder body; 3. a left cover; 4. a right cover; 5. a rear cover; 6. a water inlet and outlet valve; 7. a split type connecting rod; 8. a crankshaft; 9. a plunger; 10. a link pin; 11. mounting a through hole; 12. mounting holes; 13. a cylindrical roller bearing; 71. a first link; 72. a second link; 81. a round shaft portion; 82. an eccentric wheel; 721. an oil guide groove; 91. a plunger seat; 92. a ceramic tube; 93. locking screws; 94. a seal ring; 95. a copper gasket; 911. a water chute.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above terms should not be construed as limiting the present invention.

As shown in fig. 1-2, the pump head of the plunger pump comprises a crankcase 1 and a cylinder body 2, the cylinder body 2 is in sealing connection with the crankcase 1 through a screw and an O-shaped ring, a plurality of water inlet and outlet channels communicated with a mounting hole 12 in a one-to-one correspondence are formed in the cylinder body 2, a water inlet and outlet valve 6 is arranged at an inlet and an outlet of each water inlet and outlet channel, a left cover 3, a right cover 4, a rear cover 5 and the like are further arranged on the crankcase 1, an oil window can be arranged on one cover, so that the internal oil quantity of the crankcase 1 can be conveniently observed, an oil filling port can be further arranged at the top of the crankcase 1, oil can be conveniently filled, specifically, see fig. 2, other oil seals, the O-shaped ring, the screw and the like are not repeated, and the mounting mode is the prior art in the field. Other parts are also shown in fig. 2, and are all in conventional arrangement, which is not an important technical solution of the present application, and therefore, the details thereof are not described.

As shown in fig. 5, in particular, a mounting through hole 11 for mounting the crankshaft 8 and a plurality of mounting holes 12 for mounting the plungers 9 are formed in the crankcase 1, and the crankshaft 8 is connected with each plunger 9 through a split type connecting rod 7, so that when the crankshaft 8 rotates, the crankshaft 8 can drive each plunger 9 to reciprocate in the mounting hole 12 through the split type connecting rod 7; and the crankcase 1 is also provided with a fuel filling hole.

As shown in fig. 3, each split connecting rod 7 includes a first connecting rod 71 and a second connecting rod 72 fixed to the first connecting rod 71 by screws, inner rings of the first connecting rod 71 and the second connecting rod 72 are spliced together to form a complete circle so as to be able to fit the outer contour of a circular shaft portion 81 of a crankshaft 8, the circular shaft portion 81 is located between eccentric wheels 82 of two adjacent crankshafts 8, each split connecting rod 7 corresponds to one circular shaft portion 81, the width of each split connecting rod 7 is equal to or nearly equal to the length of the corresponding circular shaft portion 81, two adjacent eccentric wheels 82 of a crankshaft 8 are connected by the circular shaft portion 81, but all the circular shaft portions 81 are not necessarily in the same straight line, so that the plunger 9 can be driven to reciprocate in the mounting hole 12. Therefore, by installing the first connecting rod 71 and the second connecting rod 72 between the two eccentric wheels 82 of the crankshaft 8, the crankshaft 8 with different strokes, different eccentric wheel 82 radiuses and different forces can be replaced by designing the circular shaft part 81 to be matched with the inner ring of the first connecting rod and the second connecting rod, which cannot be realized by the existing integrated connecting rod, because the integrated connecting rod cannot be detached unless the crankshaft 8 is split, the precision of the crankshaft 8 cannot be controlled, and the crankshaft 8 is difficult to process.

Preferably, the second link 72 is rotatably connected to the plunger 9 pump by the link pin 10, and the plunger 9 pump and the link pin 10 and the plunger 9 and the link pin 10 are in clearance fit. Therefore, lubricating oil can form a lubricating oil film in the clearance more easily, abrasion among fittings under high stress is reduced, and the condition that the crank case 1 is damaged due to the fact that the connecting rod pin 10 moves left and right can be effectively prevented as long as the connecting rod pin 10 is tightly pressed in the hole of the plunger 9 through a common set screw, and the condition that the connecting rod pin 10 drives left and right can also be reduced through the inner wall space of the crank case 1. The connecting rod pin 10 is a common round-head pin, so that the friction damage to the inner wall of the crankcase 1 can be further reduced.

In the present embodiment, in order to offset the difficulty of forming a lubricating oil film between the split type connecting rod 7 and the crankshaft 8 due to the widening of the split type connecting rod 7, the second connecting rod 72 is provided with an oil guide groove 721 communicated with the position of the connecting rod pin 10.

As shown in fig. 4, in this embodiment, the plunger 9 includes a plunger seat 91, a ceramic tube 92 and a locking screw 93, the locking screw 93 passes through the inside of the ceramic tube 92 and is screwed with the plunger seat 91, a copper gasket 95 is provided between the ceramic tube 92 and the plunger seat 91, a sealing ring 94 is provided between the locking screw 93 and the locking screw 93, and the outer diameter of the copper gasket 95 is larger than the outer diameters of the ceramic tube 92 and the plunger seat 91, the plunger 9 can keep sliding connection with the mounting hole 12 through the copper gasket 95, so that the contact area can be reduced, the smooth degree of the movement of the plunger 9 is improved, and it can be ensured that the ceramic tube 92 is not easy to burst because the ceramic tube 92 does not contact with the inner wall of the mounting hole 12.

Preferably, the copper gasket 95 is provided with a water guiding groove 911, so that the ceramic tube 92 is protected from bursting when the sealing ring 94 is broken. When the sealing ring 94 between the locking screw 93 and the ceramic tube 92 is damaged under the pressure of the high-pressure water, the water guide channel 911 can discharge the high-pressure water pressure leaking into the ceramic tube 92 through the damaged sealing ring 94, so as to prevent the ceramic tube 92 from bursting due to the high pressure existing inside the ceramic tube 92.

In the present embodiment, a cylindrical roller bearing 13 is provided between the crankshaft 8 and the mounting through hole 11, the cylindrical roller bearing 13 is used for mounting the motor shaft, and the model of the cylindrical roller bearing 13 is preferably NJ 2206E. Compare traditional deep groove ball bearing, adopt cylindrical roller bearing 13 can bear higher rated load to make this pump head output higher pressure.

The present invention is not described in detail in the prior art, and therefore, the present invention is not described in detail.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Although the terms of the crank case 1, the cylinder block 2, the left cover 3, the right cover 4, the rear cover 5, the water inlet/outlet valve 6, the split type connecting rod 7, the crankshaft 8, the plunger 9, the connecting rod pin 10, the mounting through hole 11, the mounting hole 12, the cylindrical roller bearing 13, the first connecting rod 71, the second connecting rod 72, the circular shaft portion 81, the eccentric 82, the oil guide groove 721, the plunger seat 91, the ceramic tube 92, the locking screw 93, the seal ring 94, the copper gasket 95, the water guide groove 911, etc. are used more frequently herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present application, fall within the protection scope of the present invention.

Claims

1. A pump head of a plunger pump is characterized by comprising a crankcase and a cylinder body; the crankshaft is connected with each plunger through a split type connecting rod, so that when the crankshaft rotates, the crankshaft can drive each plunger to reciprocate in the mounting hole through the split type connecting rod; the cylinder body is detachably and hermetically connected with the crankcase, a plurality of water inlet and outlet channels which are in one-to-one correspondence communication with the mounting holes are arranged on the cylinder body, and a water inlet and outlet valve is arranged at an inlet and an outlet of each water inlet and outlet channel; the split connecting rod is detachable so as to disconnect the crankshaft.

2. A plunger pump head as claimed in claim 1, wherein each of the split connecting rods comprises a first connecting rod and a second connecting rod detachably connected to the first connecting rod, the inner rings of the first and second connecting rods are spliced together to form a complete circle so as to fit the outer contour of the circular shaft portion of the crankshaft, and the circular shaft portion is located between the eccentrics of two adjacent crankshafts.

3. A plunger pump head as claimed in claim 2, wherein the second link is rotationally connected to the plunger pump by a link pin.

4. A plunger pump head as claimed in claim 3, wherein the connecting rod and the connecting rod pin and the plunger and the connecting rod pin are in clearance fit, and the connecting rod pin is retained by a retaining boss on the inside of the crankcase.

5. A plunger pump head as claimed in claim 4, wherein each of the split connecting rods corresponds to a respective one of the circular shaft portions, and the width of each of the split connecting rods is equal to or approximately equal to the length of the corresponding circular shaft portion.

6. A plunger pump head as claimed in claim 5, wherein the second link has oil-guiding grooves communicating with the location of the link pin.

7. A plunger pump head as claimed in claim 1, wherein the plunger comprises a plunger seat, a ceramic tube and a locking screw, the locking screw passes through the inside of the ceramic tube and is screwed with the plunger seat, a copper gasket is arranged between the ceramic tube and the plunger seat, a sealing ring is arranged between the locking screw and the locking screw, and the outer diameter of the copper gasket is larger than the outer diameters of the ceramic tube and the plunger seat.

8. A plunger pump head as claimed in claim 7, wherein the copper shim is provided with a water chute.

9. A plunger pump head as claimed in any one of claims 1 to 8, wherein a cylindrical roller bearing is provided between the crankshaft and the mounting through-hole.

10. A plunger pump head as claimed in any one of claims 1 to 8, wherein the crankcase and cylinder block are secured by a connector.