阅读说明：本技术 一种带缓冲装置和背压装置的柱塞计量泵 (Plunger metering pump with buffer device and back pressure device ) 是由 刘羽彤 刘胜利 于 2020-06-17 设计创作，主要内容包括：本发明涉及计量泵技术领域,具体是一种带缓冲装置和背压装置的柱塞计量泵,包括：一泵头,所述泵头中心设有介质流道、贯穿所述泵头顶部的阀组孔；安装在所述泵头上的缓冲装置,所述缓冲装置与所述介质流道接通,用于平滑介质管路脉动,实现介质流道内介质的缓冲；背压装置,所述背压装置安装在所述缓冲装置设有的泵出口处,用于增加泵出口处介质的压力；以及柱塞组件,所述泵头远离所述缓冲装置的一侧设有通孔接通所述阀组孔与柱塞组件,所述柱塞组件往复运动改变泵腔容积,实现吸液、排液。本发明的有益效果是：结构紧凑,安装方便,消除脉冲效果优良,还能避免出现虹吸现象。(The invention relates to the technical field of metering pumps, in particular to a plunger metering pump with a buffer device and a back pressure device, which comprises: the center of the pump head is provided with a medium flow passage and a valve group hole penetrating through the top of the pump head; the buffer device is arranged on the pump head, is communicated with the medium flow passage and is used for smoothing pulsation of the medium pipeline and realizing buffering of a medium in the medium flow passage; the back pressure device is arranged at a pump outlet arranged on the buffer device and is used for increasing the pressure of a medium at the pump outlet; and one side of the pump head, which is far away from the buffer device, is provided with a through hole for communicating the valve group hole with the plunger assembly, and the plunger assembly reciprocates to change the volume of the pump cavity and realize liquid suction and liquid discharge. The invention has the beneficial effects that: compact structure, simple to operate, it is good to eliminate the pulse effect, can also avoid appearing the siphon phenomenon.)

1. A plunger metering pump with a buffering device and a back pressure device is characterized by comprising:

the center of the pump head is provided with a medium flow passage and a valve group hole penetrating through the top of the pump head;

the buffer device is arranged on the pump head, is communicated with the medium flow passage and is used for smoothing pulsation of the medium pipeline and realizing buffering of a medium in the medium flow passage;

the back pressure device is arranged at a pump outlet arranged on the buffer device and is used for increasing the pressure of a medium at the pump outlet;

the pump head is far away from one side of buffer is equipped with the through-hole switch-on valve block hole and plunger subassembly, plunger subassembly reciprocating motion changes the pump chamber volume, realizes imbibition, flowing back.

2. The plunger metering pump with the buffering device and the back pressure device as claimed in claim 1, wherein a pump inlet is arranged on the pump head, and the pump inlet is communicated with the medium flow passage and the medium pipeline.

3. The plunger metering pump with the buffering device and the backpressure device as claimed in claim 1, further comprising a valve group, wherein the valve group comprises a pressing cap, an upper valve group and a lower valve group, the upper valve group and the lower valve group are mounted in the valve group hole, the pressing cap is used for pressing the upper valve group and the lower valve group tightly, and the plunger assembly reciprocates to change the volume of the pump cavity to realize the alternate opening and closing of the upper valve group and the lower valve group.

4. The plunger metering pump with the buffering device and the backpressure device as claimed in claim 3, wherein the upper valve set comprises an upper valve seat, an upper valve ball, an upper valve limiting sleeve and an upper overflowing sleeve which are sequentially arranged from the through hole side, and the lower valve set comprises a lower overflowing sleeve, a lower valve limiting sleeve, a lower valve ball and a lower valve seat which are sequentially arranged from the through hole side; the lower overflowing sleeve is communicated with the plunger assembly, and the upper overflowing sleeve is communicated with the buffering device.

5. The plunger metering pump with the cushioning device and the back pressure device of claim 3, wherein the valve block further comprises a plurality of sealing gaskets disposed between the components of the valve block.

6. The plunger metering pump with the buffering device and the backpressure device as claimed in claim 1, wherein the buffering device comprises a pulse damper, the pulse damper comprises an upper damper valve body, a diaphragm and a lower damper valve body, the upper damper valve body and the lower damper valve body are connected through a bolt, and the diaphragm is arranged between the upper damper valve body and the lower damper valve body to form a medium cavity and a gas cavity.

7. The plunger metering pump with the buffering device and the backpressure device as claimed in claim 6, wherein the damper gauge stand is mounted on the upper valve body of the damper, a pressure gauge and an inflation valve are arranged on the damper gauge stand, and the pressure gauge and the inflation valve are communicated with the gas cavity.

8. The plunger metering pump with the buffering device and the backpressure device as claimed in claim 1, wherein the plunger assembly comprises a plunger, a packing gland nut, a packing seal and a packing chamber, the packing chamber is mounted on the pump head, the plunger is arranged in a pump chamber provided in the packing chamber, the packing seal for sealing the pump chamber is arranged between the pump chamber and the outer circumference of the plunger, and the packing gland nut is mounted at one end of the packing chamber far away from the pump head and used for pressing the packing seal.

9. The plunger metering pump with the buffering device and the back pressure device as claimed in claim 8, further comprising a connecting box body and a crankcase, wherein the pump head is connected with the crankcase through the connecting box body, and a crosshead of the crankcase is connected with the plunger.

10. The plunger metering pump of claim 1, characterized in that, backpressure device includes backpressure valve disk seat, backpressure valve pressure regulating disk seat and backpressure valve spring, backpressure valve pressure regulating disk seat threaded mounting on the pump mouth, backpressure valve disk seat passes through backpressure valve spring coupling backpressure valve pressure regulating disk seat to with the counter bore bottom butt that the pump mouth was equipped with, backpressure valve pressure regulating disk seat is used for supporting backpressure valve spring still is used for adjusting backpressure valve spring's elasticity.

Technical Field

The invention relates to the technical field of metering pumps, in particular to a plunger metering pump with a buffering device and a back pressure device.

Background

The pulse damper and the back pressure valve are accessories which are necessary to be equipped for the metering pump, the pulse damper belongs to one of energy accumulators, and the pulse damper can smooth pipeline pulsation through the change of the volume of the air chamber, and can be used for eliminating pipeline vibration, reducing pressure pulsation, reducing flow floating and protecting downstream instruments and equipment; back Pressure (Back Pressure), which refers to the Pressure at the Back end, is commonly used to describe the Pressure against which the fluid exiting the system is subjected at the outlet or secondary side, which is opposite to the direction of flow; the back pressure valve is installed on the outlet pipeline of the metering pump, so that the outlet resistance of the pump is increased, the outlet pressure of the pump is increased, and the outlet pressure of the metering pump is higher than the inlet pressure of the metering pump, thereby eliminating siphon.

The pulse damper and the backpressure valve on the market at present have the defects that: the pulse damper and the back pressure valve are independently arranged on an outlet pipeline of the metering pump, the size is large, the requirement on the installation position is met, and the installation is complicated; some users mount the pulse damper at will, which causes the pulse damper to be far away from the outlet of the metering pump, and violates the principle that the closer the pulse damper is mounted to the outlet of the metering pump, the better the pulse damper is, thereby greatly reducing the effect of eliminating the pulse; the air type pulse damper can eliminate pulses, but the volume of the air type pulse damper is larger than that of the diaphragm type pulse damper, and the pulse eliminating effect is poor.

Disclosure of Invention

The present invention is directed to a plunger metering pump with a buffer device and a back pressure device to solve the problems of the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

a plunger metering pump with a cushioning device and a back pressure device, comprising: the center of the pump head is provided with a medium flow passage and a valve group hole penetrating through the top of the pump head; the buffer device is arranged on the pump head, is communicated with the medium flow passage and is used for smoothing pulsation of the medium pipeline and realizing buffering of a medium in the medium flow passage; the back pressure device is arranged at a pump outlet arranged on the buffer device and is used for increasing the pressure of a medium at the pump outlet; and one side of the pump head, which is far away from the buffer device, is provided with a through hole for communicating the valve group hole with the plunger assembly, and the plunger assembly reciprocates to change the volume of the pump cavity and realize liquid suction and liquid discharge.

As a further scheme of the invention: the pump head is provided with a pump inlet, and the pump inlet is communicated with the medium flow channel and the medium pipeline.

As a still further scheme of the invention: still include the valves, the valves is including pressing the cap, going up valves and valves down, it is downthehole at the valves to go up valves and valves down, it is used for compressing tightly to press the cap go up valves and valves down, plunger subassembly reciprocating motion changes the pump chamber volume and realizes the switching in turn of going up valves and valves down.

As a still further scheme of the invention: the upper valve group comprises an upper valve seat, an upper valve ball, an upper valve limiting sleeve and an upper overflowing sleeve which are sequentially arranged from the through hole side, and the lower valve group comprises a lower overflowing sleeve, a lower valve limiting sleeve, a lower valve ball and a lower valve seat which are sequentially arranged from the through hole side; the lower overflowing sleeve is communicated with the plunger assembly, and the upper overflowing sleeve is communicated with the buffering device.

As a still further scheme of the invention: the valve group also comprises a plurality of sealing gaskets which are arranged among all the parts of the valve group.

As a still further scheme of the invention: the buffer device comprises a pulse damper, the pulse damper comprises an upper damper valve body, a diaphragm and a lower damper valve body, the upper damper valve body is connected with the lower damper valve body through bolts, and the diaphragm is arranged between the upper damper valve body and the lower damper valve body to form a medium cavity and a gas cavity.

As a still further scheme of the invention: the gas cavity is communicated with the gas cavity, and the damper upper valve body is provided with a damper gauge stand which is provided with a pressure gauge and an inflation valve.

As a still further scheme of the invention: the plunger assembly comprises a plunger, a packing gland nut, a packing seal and a packing chamber, the packing chamber is installed on the pump head, the plunger is arranged in a pump cavity formed in the packing chamber and used for sealing the pump cavity, the packing seal is arranged between the pump cavity and the outer circumference of the plunger, and the packing gland nut is installed at one end, far away from the pump head, of the packing chamber and used for compressing the packing seal.

As a still further scheme of the invention: still including connecting box and crankcase, the pump head passes through connect the crankcase of box, the cross head of crankcase with the plunger is connected.

As a still further scheme of the invention: the backpressure device includes back pressure valve disk seat, back pressure valve pressure regulating disk seat and back pressure valve spring, back pressure valve pressure regulating disk seat screw thread is installed on the pump export, the back pressure valve disk seat passes through back pressure valve spring coupling back pressure valve pressure regulating disk seat, and with the counter bore bottom butt that the pump export was equipped with, the external diameter of back pressure valve disk seat is less than the internal diameter of counter bore, the center of back pressure valve pressure regulating disk seat is equipped with the through-hole, back pressure valve pressure regulating disk seat is used for supporting back pressure valve spring still is used for adjusting back pressure valve spring's elasticity.

Compared with the prior art, the invention has the beneficial effects that: compact structure, simple to operate, it is good to eliminate the pulse effect, can also avoid appearing the siphon phenomenon.

Drawings

Fig. 1 is a schematic view of a plunger metering pump with a buffer device and a back pressure device.

In the drawings: 1-plunger, 2-connecting box body, 3-packing gland nut, 4-packing seal, 5-packing chamber, 6-upper valve seat, 7-upper valve ball, 8-upper valve limiting sleeve, 9-upper overflowing sleeve, 10-pressing cap, 11-pump head clamping nut, 12-pump inlet, 13-lower valve seat, 14-lower valve ball, 15-sealing gasket, 16-lower valve limiting sleeve, 17-lower overflowing sleeve, 18-pump head, 19-backpressure valve seat, 20-damper lower valve body, 21-backpressure valve regulating valve seat, 22-backpressure valve spring, 23-pump outlet, 24-damper upper valve body, 25-damper gauge seat, 26-pressure gauge, 27-inflation valve, 28-diaphragm and 29-bolt.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

Referring to fig. 1, in an embodiment of the present invention, a plunger metering pump with a buffering device and a back pressure device includes: the pump head 18 is provided with a medium flow passage and a valve group hole penetrating through the top of the pump head 18 in the center; the buffer device is arranged on the pump head, is communicated with the medium flow passage and is used for smoothing pulsation of the medium pipeline and realizing buffering of a medium in the medium flow passage; the back pressure device is arranged at the pump outlet 23 of the buffer device and is used for increasing the pressure of a medium at the pump outlet 23; and one side of the pump head 18, which is far away from the buffer device, is provided with a through hole which is communicated with the valve group hole and the plunger assembly, and the plunger assembly reciprocates to change the volume of the pump cavity so as to realize liquid suction and liquid discharge.

Specifically, the medium enters the medium channel to reach the valve group hole and then flows to the buffer device, the pressure of the medium pushes the buffer device to smooth the medium pipeline to pulsate, so that the medium in the medium channel is buffered, and then the pulsed medium is eliminated and flows to the back pressure device at the pump outlet 23; if the pressure of the medium is larger than the set value of the back pressure device, the back pressure device opens the pump outlet 23, and the medium flows out of the pump outlet 23; if the pressure of the medium is less than the set value of the back pressure means, the back pressure means cannot open the pump outlet 23. The medium is blocked until its pressure is greater than the set value of the back pressure means. Through the arrangement of the back pressure device, the phenomenon of siphonage caused by the fact that the pressure of the pump outlet 23 is smaller than that of the pump inlet when the medium flows out of the pump outlet 23 is avoided. The buffer device smoothes medium pipeline pulsation, realizes the buffering of media in a medium flow channel, protects other parts and instruments of the medium pipeline where the plunger metering pump with the buffer device and the back pressure device is located, and has better buffering effect because the buffer device is directly connected with the pump head.

Further, the damping means comprises a pulse damper in communication with the media flow path in the pump head 18 for smoothing out media line pulsations.

Referring to fig. 1, in the embodiment of the present invention, a pump inlet 12 is disposed on the pump head 18, and the pump inlet 12 is connected to a medium flow passage and a medium pipeline.

In particular, the pump inlet 12 is connected to a medium line, and a medium flows from the medium line through the pump inlet 12 into the medium channel.

Referring to fig. 1, in the embodiment of the present invention, the valve assembly further includes a pressing cap 10, an upper valve assembly and a lower valve assembly, the upper valve assembly and the lower valve assembly are installed in the valve assembly hole, the pressing cap 10 is used for pressing the upper valve assembly and the lower valve assembly, and the plunger assembly reciprocates to change the volume of the pump cavity to realize the alternate opening and closing of the upper valve assembly and the lower valve assembly.

Specifically, the lower valve group and the upper valve group are sequentially installed in the valve group hole and are pressed tightly by a pressing cap 10. And a flow passing cavity is arranged between the upper valve group and the lower valve group and is communicated with the plunger assembly through a through hole. The upper valve group and the lower valve group are alternately opened under the change of the volumes of the overflowing cavity and the pump cavity, so that the medium in the overflowing cavity is sent out in stages, the pressure of the sent medium pushes the pulse damper, the pulsation of a medium pipeline is smoothed, the buffering of the medium in a medium flow channel is realized, and other parts and instruments on the medium pipeline are protected. When the valve group is mounted or dismounted, the valve group can be quickly and conveniently taken out or put in the valve group hole, and the workload of mounting or dismounting is reduced.

Referring to fig. 1, in the embodiment of the present invention, the upper valve set includes an upper valve seat 6, an upper valve ball 7, an upper valve limiting sleeve 8, and an upper flow sleeve 9, which are sequentially disposed from the through hole side, and the lower valve set includes a lower flow sleeve 17, a lower valve limiting sleeve 16, a lower valve ball 14, and a lower valve seat 13, which are sequentially disposed from the through hole side; the lower overflowing sleeve 17 is communicated with the through hole, and the upper overflowing sleeve is communicated with the buffer device.

Specifically, the lower valve group is tightly connected with the upper valve group and is tightly pressed by the pressing cap 10; the plunger assembly moves away from the pump head 18, the volume of a pump cavity is increased, the pressure on the lower valve ball 14 and the upper valve ball 7 is reduced, the medium fed from the pump inlet 12 pushes the lower valve ball 14 away, and meanwhile, the upper valve ball 7 is tightly sealed on the upper valve seat 6, passes through the lower valve seat 13 and the lower valve limiting sleeve 16 and enters the lower flow passage sleeve 17 and the plunger assembly; and the plunger assembly returns to move towards the direction close to the pump head 18, the volume of a pump cavity is reduced, the pressure on the lower valve ball 14 and the upper valve ball 7 is increased, so that the lower valve ball 14 blocks the lower valve seat 13, the upper valve ball 7 opens the upper valve seat 6, and the media in the lower overflowing sleeve 17 and the plunger assembly pass through the upper valve seat 6 to flow into the upper overflowing sleeve 9 and then enter the pulse damper. During the reciprocating motion of the plunger assembly, the lower valve ball 14 and the upper valve ball 7 alternately open the lower valve seat 13 and the upper valve seat 6 respectively; realize liquid suction and liquid discharge. The lower valve limiting sleeve 16 functions to limit the lower valve ball 14 and the upper valve limiting sleeve 8 functions to limit the upper valve ball 7.

Referring to fig. 1, in a preferred embodiment of the present invention, the valve block further includes a sealing gasket 15, and a plurality of sealing gaskets 15 are disposed between each component of the valve block.

Specifically, the sealing gasket 15 is arranged between each component of the valve group, plays a role in sealing, prevents a medium from leaking between each component of the valve group, and improves the metering precision. Protect each part not corroded, improve its life, practiced thrift the cost.

Referring to fig. 1, in the embodiment of the present invention, the buffering device includes a pulse damper, the pulse damper includes an upper damper valve body 24, a diaphragm 28, and a lower damper valve body 20, the upper damper valve body 24 and the lower damper valve body 20 are connected by a bolt, and the diaphragm 28 is disposed between the upper damper valve body 24 and the lower damper valve body 20 to form a medium chamber and a gas chamber.

Specifically, the diaphragm 28 is disposed between the damper upper valve body 24 and the damper lower valve body 20 to form a medium chamber and a gas chamber, and the medium in the medium chamber and the gas in the gas chamber perform kinetic energy conversion, in the process, pulses carried by the medium are absorbed.

Referring to fig. 1, in the embodiment of the present invention, a damper gauge seat 25 is installed on the upper valve body of the damper, a pressure gauge 26 and an inflation valve 27 are installed on the damper gauge seat 25, and both the pressure gauge 26 and the inflation valve 27 are connected to the gas chamber.

When the medium flows to the lower valve body 20 of the damper from the upper overflowing sleeve 9, the gas in the medium cavity and the gas cavity completes kinetic energy conversion, pulses carried by the medium are eliminated, and the medium flows to the back pressure device after the pulses are eliminated. The pressure gauge 26 is used for detecting the air pressure in the air cavity, and the air is supplemented through the inflation valve 27, so that the stable and efficient operation of the pulse damper is ensured.

Referring to fig. 1, in the embodiment of the present invention, the plunger assembly includes a plunger 1, a packing gland nut 3, a packing seal 4, and a packing chamber 5, the packing chamber 5 is installed on the pump head 18, the plunger 1 is disposed in a pump chamber provided in the packing chamber 5, the packing seal 4 for sealing the pump chamber is disposed between the pump chamber and an outer circumference of the plunger, and the packing gland nut 3 is installed at an end of the packing chamber 5 away from the pump head 18, and is used for compressing the packing seal 4.

Specifically, the packing chamber 5 is separately machined and mounted on the pump head by bolts 29. The plunger 1, the packing seal 4 and the packing gland nut 3 are sequentially installed, the reciprocating motion of the plunger 1 pushes a medium in the pump cavity to penetrate through the through hole, and the circulation of liquid suction and liquid discharge is realized by matching with the alternate opening and closing of the upper valve group and the lower valve group.

Referring to fig. 1, the present embodiment further includes a connecting box 2 and a crankcase, the pump head 18 is connected to the crankcase through the connecting box 2, and a crosshead of the crankcase is connected to the plunger 1.

Specifically, one end of the connecting box body 2 is mounted on the packing chamber 5 through a pump head clamping nut 11, and the other end is connected with the crankcase. And a crosshead of the crankcase is connected with the plunger 1 to drive the plunger 1 to reciprocate.

Referring to fig. 1, in the embodiment of the present invention, the backpressure device includes a backpressure valve seat 19, a backpressure valve pressure regulating valve seat 21, and a backpressure valve spring 22, the backpressure valve pressure regulating valve seat 21 is installed on the pump outlet 23 in a threaded manner, the backpressure valve seat 19 is connected to the backpressure valve pressure regulating valve seat 21 through the backpressure valve spring 22, and is abutted to the bottom of a counter bore provided in the pump outlet 23, the outer diameter of the backpressure valve seat 19 is smaller than the diameter of the counter bore, a through hole is provided in the center of the backpressure valve pressure regulating valve seat 21, and the backpressure valve pressure regulating valve seat 21 is used for supporting the backpressure valve spring 22 and also is used for regulating the elastic force of the backpressure valve spring 22.

Concretely, follow the medium flow that the medium chamber was discharged extremely back pressure valve disk seat 19, it is right as it back pressure valve disk seat 19's pressure is less than back pressure valve spring 22 that back pressure valve pressure regulating valve disk seat 21 supported is right during back pressure valve disk seat 19's pressure, back pressure valve disk seat 19 with the counter bore bottom butt that pump outlet 23 was equipped with is stopped up pump outlet 23, the unable outflow of medium continues the gathering, and it is right until it is right back pressure valve disk seat 19's pressure is greater than back pressure valve spring 22 is right during back pressure valve disk seat 19's pressure, pump outlet 23 is pushed open by the medium, and the medium flows out, after the medium flows out back pressure valve disk seat 19 continues to be stopped up pump outlet 23 has avoided pump outlet 23 takes place the siphon phenomenon. The pressure of the backpressure valve spring 22 on the backpressure valve seat 19 is changed by adjusting the backpressure valve pressure-regulating valve seat 21, and the application scene is wide.

The working principle of the invention is as follows: the medium enters the medium flow channel to reach the valve group hole and then flows to the buffering device, the pressure of the medium pushes the buffering device to smooth the medium pipeline to pulsate, the buffering of the medium in the medium flow channel is realized, and then the pulsed medium flow is eliminated and flows to the back pressure device at the pump outlet 23; if the pressure of the medium is larger than the set value of the back pressure device, the back pressure device opens the pump outlet 23, and the medium flows out of the pump outlet 23; if the pressure of the medium is less than the set value of the back pressure means, the back pressure means cannot open the pump outlet 23. The medium is blocked until its pressure is greater than the set value of the back pressure means. Through the arrangement of the back pressure device, the phenomenon of siphonage caused by the fact that the pressure of the pump outlet 23 is smaller than that of the pump inlet when the medium flows out of the pump outlet 23 is avoided.

It should be noted that the pressure gauge and the inflation valve used in the present invention are prior art applications, and those skilled in the art can implement the intended functions according to the related description, or implement the technical features required to be accomplished by similar techniques, and will not be described in detail herein.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.