CN219317157U - Hydraulic diaphragm metering pump with double-function valve group and internal circulation pressure protection mechanism - Google Patents

Abstract

The utility model discloses a hydraulic diaphragm metering pump with a double-function valve group and an internal circulation pressure protection mechanism, which is characterized by also comprising a double-function valve group and an oil supplementing valve which are arranged on a cylinder body; the dual-function valve group comprises a pressure relief valve arranged on the cylinder body and a blow-down valve arranged in the pressure relief valve; the cylinder body is provided with an emptying channel communicated with the pump head, the double-function valve group and the oil pool and an oil supplementing channel communicated with the pump head, the oil supplementing valve and the oil pool. According to the utility model, the centering block is arranged at the upper end of the spring, when the overpressure phenomenon occurs in the hydraulic cavity in the pump head, the valve core of the pressure relief valve can timely jump to release hydraulic oil, when the pressure is recovered to be normal, the valve core is driven to timely reset through the reset force of the spring, and meanwhile, the centering block and the position of the spring are centered through the arrangement and the matching of the conical end on the centering block and the conical hole on the pressure regulating column, so that the valve core can be timely and accurately reset when the spring drives the valve core to reset, and the sensitivity and the reliability of the pressure relief valve are ensured.

Description

Hydraulic diaphragm metering pump with double-function valve group and internal circulation pressure protection mechanism

Technical Field

The utility model relates to a hydraulic diaphragm metering pump technology, in particular to a hydraulic diaphragm metering pump with a double-function valve group and an internal circulation pressure protection mechanism.

Background

The hydraulic diaphragm metering pump separates the medium from the plunger through the diaphragm, and the reciprocating plunger deflects the diaphragm by means of hydraulic oil, so that the purpose of conveying the medium is achieved; in order to prolong the service life of the diaphragm of the hydraulic diaphragm metering pump, a pressure protection mechanism must be arranged on a hydraulic system of a hydraulic end;

the following forms exist in the prior art:

1. the pressure protection mechanism of the pump adopts an external circulation mode, and when the hydraulic oil in the hydraulic cavity of the hydraulic diaphragm metering pump is overpressured or emptied, the hydraulic oil is discharged to a hydraulic oil pool of the pump through an oil discharge pipe of a pressure maintaining valve group arranged above the hydraulic cylinder body; however, the technology has the defect that when the pressure maintaining valve group suddenly jumps due to overpressure of the hydraulic system, hydraulic oil can be instantaneously discharged out of the pressure maintaining valve group, and an oil discharge pipe can fall off due to impact, so that the hydraulic oil leaks to splash; in addition, the joint between the oil drain pipe and the pressure maintaining valve bank is easy to generate the leakage phenomenon of hydraulic oil;

2. in the prior art, a valve ball of an exhaust valve positioned in a pump pressure protection system moves up and down in a valve cover limiting cavity, but because the valve ball is small in size and light in weight, the valve cannot be closed in place in hydraulic oil with higher viscosity, and the return quantity of the hydraulic oil can be increased and the volume coefficient of the pump can be reduced due to the fact that the valve ball cannot return in time;

3. in the prior art, a pressure relief valve of a pump pressure protection system adopts a spring direct-pressure structure, but as a spring and a valve core do not adopt a positioning technology, the two ends of a common spring cannot be completely guaranteed to be parallel, and the positions of the spring are easy to deviate in the use process, so that when the valve core is jumped due to overpressure of a hydraulic cavity, the valve core is difficult to reset, the sealing surface of the valve is closed untight, and the pump efficiency is influenced;

4. in the prior art, a filter is not arranged at the inlet of an oil supplementing valve of a pump pressure protection system, so that impurities are easy to enter a hydraulic system along with hydraulic oil, and once the impurities enter the hydraulic system, the sealing performance of a relief valve, a pressure relief valve and the oil supplementing valve can be influenced; for this purpose, a hydraulic diaphragm metering pump with a double-function valve block and an internal circulation pressure protection mechanism is proposed.

Disclosure of Invention

The utility model aims to solve the problems and provides a hydraulic diaphragm metering pump with a double-function valve group and an internal circulation pressure protection mechanism.

In order to achieve the purpose, the utility model provides a hydraulic diaphragm metering pump with a double-function valve group and an internal circulation pressure protection mechanism, which comprises a hydraulic end, a pump head positioned at the hydraulic end and a hydraulic cylinder arranged at one side of the pump head, wherein the hydraulic cylinder comprises a cylinder body, a connecting body arranged at one side of the cylinder body and an oil pool arranged in the connecting body; the hydraulic cylinder is characterized by also comprising a double-function valve group and an oil supplementing valve which are arranged on the cylinder body; the dual-function valve group comprises a pressure relief valve arranged on the cylinder body and a blow-down valve arranged in the pressure relief valve; the cylinder body is provided with an emptying channel communicated with the pump head, the double-function valve group and the oil pool, and an oil supplementing channel and an oil return channel communicated with the pump head, the oil supplementing valve and the oil pool.

Further preferably, a plunger which is in sliding connection with the cylinder body is arranged in the hydraulic cylinder, and one end of the plunger is connected with a connecting rod; a packing and a packing bushing are arranged between the plunger and the cylinder body, and a packing gland for arranging the packing and the packing bushing between the cylinder body and the plunger is also arranged on the cylinder body.

Further preferably, the pressure release valve comprises a valve body arranged on the cylinder body, a valve seat arranged in the valve body, one end of the valve seat is in fit and seal with the cylinder body, a valve core movably arranged in the valve body, a pressure regulating column arranged on the valve body in a sliding manner, and an adjusting sleeve and a locking nut which are arranged on the valve body; the vent valve is arranged on the valve core; and the valve seat, the valve core and the valve body are provided with reflow holes communicated with the emptying channel.

Further preferably, a centering block and a spring are also arranged between the pressure regulating column and the valve core; the center of one end of the centering block matched with the pressure regulating column is provided with a conical head, and the pressure regulating column is provided with a conical hole matched with the conical head.

Further preferably, a steel ball is arranged at the center of the top of the pressure regulating column, and the pressure regulating column is in contact connection with the regulating sleeve through the steel ball.

Further preferably, the blow-off valve comprises a valve sleeve arranged on the valve core, a push rod movably arranged in the valve sleeve, a valve ball arranged at one end of the push rod and positioned in the valve sleeve, and a weight ball arranged at the other end of the push rod; the ejector rod is in clearance fit with the valve sleeve, and the valve sleeve is also provided with a passage port matched with the valve ball.

Further preferably, the oil supplementing valve comprises a shell mounted on the cylinder body and a one-way valve mounted on the cylinder body and positioned in the shell; and the one-way valve is also provided with a filter, and the oil supplementing channel is communicated with the shell.

According to the utility model, the centering block is arranged at the upper end of the spring, when an overpressure phenomenon occurs in the hydraulic cavity in the pump head, the valve core of the pressure relief valve can timely jump to release hydraulic oil, when the pressure is recovered to be normal, the valve core is driven to reset timely through the reset force of the spring, and meanwhile, the centering block and the position of the spring are centered through the arrangement and the matching of the conical end on the centering block and the conical hole on the pressure regulating column, so that the valve core can be timely and accurately reset when the spring drives the valve core to reset, the sensitivity and the reliability of the pressure relief valve are ensured, the pressure protection effect is truly realized, and the defects that the valve core in the prior art is relatively delayed in jump, the reset accuracy is poor, and the pressure protection effect is affected are overcome;

the ejector rod is arranged on the valve ball of the emptying valve, and the counterweight ball is arranged on the ejector rod, so that the valve ball can fall down and reset in time in the hydraulic oil with higher viscosity by the gravity of the counterweight ball, the reflux quantity of the hydraulic oil is reduced, the function of improving the volume coefficient of the pump can be achieved, and the problems that the valve ball of the emptying valve is slow in resetting speed and not easy to reset, excessive reflux of the hydraulic oil is caused, and the volume coefficient of the pump is influenced in the prior art are solved;

through installing the filter in the check valve import department of moisturizing valve, before the oil in the oil pool is mended in the pump head through moisturizing valve and moisturizing passageway, avoid the impurity in the hydraulic oil to get into and influence the sealing performance of moisturizing valve, relief valve and relief valve.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of a dual function valve block according to the present utility model;

FIG. 3 is a schematic view of a partial structure of a dual function valve block of the present utility model;

FIG. 4 is a schematic diagram of the structure of the oil replenishing valve in the utility model;

fig. 5 is a schematic view of the structure of the present utility model in use.

Legend description: 1. a hydraulic end; 2. a pump head; 3. a hydraulic cylinder; 31. a cylinder; 311. a vent passage; 312. an oil supplementing channel; 313. an oil return passage; 32. a coupling body; 33. an oil pool; 34. a plunger; 35. a connecting rod; 36. packing; 37. a filler sleeve; 38. a packing gland; 4. a dual function valve block; 41. a pressure release valve; 411. a valve body; 412. a valve seat; 413. a valve core; 414. a pressure regulating column; 415. an adjusting sleeve; 416. a lock nut; 417. a reflow hole; 418. a centering block; 419. a spring; 420. a conical head; 421. conical holes; 422. a valve sleeve; 423. a push rod; 425. a valve ball; 426. a weight ball; 427. a passage opening; 428. a steel ball; 42. a blow-off valve; 5. an oil supplementing valve; 51. a housing; 52. a one-way valve; 53. and (3) a filter.

Detailed Description

The hydraulic diaphragm metering pump with the double-function valve group and the internal circulation pressure protection mechanism according to the utility model is further described below with reference to the accompanying drawings.

Referring to fig. 1-5, a hydraulic diaphragm metering pump with a dual-function valve group and an internal circulation pressure protection mechanism comprises a hydraulic end 1, a pump head 2 positioned at the hydraulic end 1 and a hydraulic cylinder 3 arranged on one side of the pump head 2, wherein the hydraulic cylinder 3 comprises a cylinder body 31, a connecting body 32 arranged on one side of the cylinder body 31 and an oil pool 33 arranged in the connecting body 32; the hydraulic cylinder is characterized by also comprising a double-function valve group 4 and an oil supplementing valve 5 which are arranged on the cylinder body 31; the dual function valve block 4 includes a relief valve 41 mounted on the cylinder 31, and a blow-off valve 42 mounted in the relief valve 41; the cylinder body 31 is provided with a vent channel 311 which is communicated with the pump head 2, the double-function valve group 4 and the oil tank 33, and an oil supplementing channel 312 and an oil return channel 313 which are communicated with the pump head 2, the oil supplementing valve 5 and the oil tank 33;

through setting up the blowdown passageway 311, oil return passageway 312 and oil compensating passageway 312 inside cylinder body 31, form the inner loop in pneumatic cylinder 3, need not external oil pipe, avoid oil pipe probably to drop because of receiving the impact of hydraulic oil, cause hydraulic oil to leak to splashing outward, avoid oil pipe junction to produce the phenomenon that hydraulic oil seepage leaked simultaneously to form the inner loop pressure protection.

Further, a plunger 34 slidably connected with the cylinder body 31 is installed in the hydraulic cylinder 3, and one end of the plunger 34 is connected with a connecting rod 35; a packing 36 and a packing bushing 37 are arranged between the plunger 34 and the cylinder 31, and a packing gland 38 for installing the packing 36 and the packing bushing 37 between the cylinder 31 and the plunger 34 is also arranged on the cylinder 31; the plunger 34 is driven by the connecting rod 35 to reciprocate back and forth in the cylinder 31; by the provision of the packing 36 and packing 37, a sealing effect is provided between the plunger 34 and the cylinder 31.

Further, the relief valve 41 comprises a valve body 411 mounted on the cylinder 31, a valve seat 412 mounted in the valve body 411 and having one end sealed against the cylinder 31, a valve core 413 movably mounted in the valve body 411, a pressure regulating column 414 slidably mounted on the valve body 411, a regulating sleeve 415 mounted on the valve body 411, and a locking nut 416; the vent valve 42 is mounted on the valve spool 413; the valve seat 412, the valve core 413 and the valve body 411 are provided with a backflow hole 417 communicated with the vent channel 311; the pressure value of opening the relief valve 41 is adjusted by adjusting the position of the adjusting sleeve 415 on the valve body 411 to adjust the position of the pressure adjusting column in the valve body 411 and the pressing force to the spring 419; by means of the locking nut 416, the adjusting sleeve 415 is arranged to be locked and mounted on the valve body 411.

Further, a centering block 418 and a spring 419 are also installed between the pressure regulating column 414 and the valve spool 413; a conical head 420 is arranged in the center of one end of the centering block 418 matched with the pressure regulating column 414, and a conical hole 421 matched with the conical head 420 is arranged on the pressure regulating column 414;

through setting up centering piece 418 in the spring 419 upper end, when the superpressure phenomenon appears in the hydraulic pressure chamber in pump head 2, the case of relief valve 41 can take off in time, release hydraulic oil, when pressure resumes normal time, drive case 413 in time to reset through the restoring force of spring 419, simultaneously through setting up and the cooperation of conical port 421 on centering piece 418 upper cone end 420 and pressure regulating post 414, play the centering effect to the position of centering piece 418 and spring 419, thereby can in time accurate the reset when spring 419 drives the case 413 to reset, the sensitivity and the reliability of relief valve 41 have been guaranteed, really play the pressure protection effect.

Further, a steel ball 428 is installed at the center of the top of the pressure regulating column 414, and the pressure regulating column 414 is in contact connection with the regulating sleeve 415 through the steel ball 428; through installing steel ball 428 at pressure regulating column 414 top central part to make adjusting sleeve 415 when pressure regulating column 414 forms the extrusion downwards, through steel ball 428 single-point contact, replace originally adjusting sleeve 415 and pressure regulating column 414 face and face contact, thereby reduce the frictional force when adjusting sleeve 415 adjusts, simultaneously set up steel ball 428 at central part, thereby make the compressive point be in central part, make pressure regulating column 414 can reciprocate vertically, avoid the slope of force and lead to pressure regulating column 414 slope to produce friction with valve body 411 inner wall, even block.

Further, the blow-off valve 42 comprises a valve sleeve 422 mounted on the valve core 413, a push rod 423 movably mounted in the valve sleeve 422, a valve ball 425 mounted at one end of the push rod 423 and positioned in the valve sleeve 422, and a weight ball 426 mounted at the other end of the push rod 423; the ejector rod 423 is in clearance fit with the valve sleeve 422, and a passage opening 427 matched with the valve ball 425 is also formed in the valve sleeve 422;

through set up ejector pin 423 on the valve ball 425 of blow-down valve 42, install counter weight ball 426 on ejector pin 423 to make valve ball 425 in the higher hydraulic oil of viscosity in time drop through the gravity of counter weight ball 426 reset, reduce the reflux volume of hydraulic oil, can play the volume coefficient effect of improvement pump.

Further, the oil replenishing valve 5 includes a housing 51 mounted on the cylinder 31 and a check valve 52 mounted on the cylinder 31 and located in the housing 51; the check valve 52 is also provided with a filter 53, and the oil supplementing channel 312 is communicated with the shell 51;

by installing the filter 53 at the inlet of the check valve 52 of the oil supplementing valve 5, when the oil in the oil pool 33 is supplemented into the pump head 2 through the oil supplementing valve 5 and the oil supplementing channel 312, the hydraulic oil is filtered, so that the sealing performance of the oil supplementing valve 5, the vent valve 42 and the pressure relief valve 41 is prevented from being influenced by the entry of impurities in the hydraulic oil.

The application process of the utility model comprises the following steps: when the overpressure phenomenon is generated in the cylinder 31 and the pump head 2, the hydraulic oil pushes the valve core 413 to act upwards under the pressure action, the seal between the valve seat 412 and the valve core 413 is opened, the vent channel 311 is opened, the hydraulic oil flows into the valve body 411 and flows back to the oil tank 33 along the vent channel 311 after flowing into the vent channel 311 through the backflow hole 417 on the valve body 411, until the valve core 413 is accurately reset under the action of the centering block 418 and the spring 419 after the pressure is recovered to be normal, and one pressure protection action is completed;

when the driving mechanism of the metering pump drives the connecting rod 35 to act, and the connecting rod 35 drives the plunger 34 to move forwards, the plunger 34 pushes the diaphragm of the pump head 2 to flex forwards through hydraulic oil, meanwhile, a small amount of hydraulic oil flows into the backflow hole 417 and the backflow channel 313 of the valve core 413 of the pressure relief valve 41 through the vent channel 311, and a small amount of hydraulic oil with air pushes the valve ball 425 to move upwards to enter the inner cavity of the valve sleeve; when the plunger 34 moves backward, as the pressure in the cylinder 31 and the pump head 2 decreases, in addition to the diaphragm being deflected backward, the valve ball 425 no longer receives pressure and falls down by the weight of the ejector pin 423 and the counterweight ball 426, and the valve ball 425 seals the return hole 417 in the valve spool 413, at which time a small amount of hydraulic oil, possibly with air, remains in the valve housing 422; when the plunger 34 moves forward again, a small amount of hydraulic oil with air in the valve sleeve 422 is discharged from the upper end of the valve sleeve 422 along the gap between the ejector rod 423 and the valve sleeve 422 into the cavity of the valve body 411, and flows back into the oil pool 33 through the backflow hole 417 on the valve body 411 and the vent channel 311 and the backflow channel 312 on the cylinder 31; with the continuous reciprocating motion of the plunger 34, the air possibly generated in the hydraulic oil can be continuously discharged out of the cylinder 31 and the pump head 2, so that the air resistance phenomenon can be avoided;

when hydraulic oil in the cylinder 31 and the pump head 2 is low due to the lack of hydraulic oil for various reasons, negative pressure is formed, the one-way valve 52 in the oil supplementing valve 5 is opened through the negative pressure, so that oil in the oil tank 33 enters the cylinder 31 and the pump head 2 for supplementing oil after being filtered by the filter 53, and the one-way valve 52 is closed until the hydraulic pressure in the cylinder 31 and the pump head 2 is recovered to be normal, and the oil supplementing is stopped;

it should be noted that, the frequency of the pressure release and oil replenishment is low, and the hydraulic oil possibly containing oil air is discharged once for every reciprocation of the plunger 34.

The scope of protection of the present utility model is not limited to the above embodiments and variations thereof. Conventional modifications and substitutions by those skilled in the art based on the content of the present embodiment fall within the protection scope of the present utility model.

Claims (7)

1. The hydraulic diaphragm metering pump with the double-function valve group and the internal circulation pressure protection mechanism comprises a hydraulic end (1), a pump head (2) positioned at the hydraulic end (1) and a hydraulic cylinder (3) arranged on one side of the pump head (2), wherein the hydraulic cylinder (3) comprises a cylinder body (31), a connecting body (32) arranged on one side of the cylinder body (31) and an oil pool (33) arranged in the connecting body (32); the hydraulic cylinder is characterized by also comprising a double-function valve group (4) and an oil supplementing valve (5) which are arranged on the cylinder body (31); the dual-function valve group (4) comprises a pressure relief valve (41) arranged on the cylinder body (31) and a blow-down valve (42) arranged in the pressure relief valve (41); the cylinder body (31) is provided with an emptying channel (311) communicated with the pump head (2), the double-function valve group (4) and the oil tank (33), and an oil supplementing channel (312) and an oil return channel (313) communicated with the pump head (2), the oil supplementing valve (5) and the oil tank (33).

2. The hydraulic diaphragm metering pump with dual function valve set and internal circulation pressure protection mechanism of claim 1, wherein: a plunger (34) which is in sliding connection with the cylinder body (31) is arranged in the hydraulic cylinder (3), and one end of the plunger (34) is connected with a connecting rod (35); a packing (36) and a packing bushing (37) are arranged between the plunger (34) and the cylinder (31), and a packing gland (38) for installing the packing (36) and the packing bushing (37) between the cylinder (31) and the plunger (34) is also arranged on the cylinder (31).

3. The hydraulic diaphragm metering pump with dual function valve set and internal circulation pressure protection mechanism of claim 1, wherein: the pressure release valve (41) comprises a valve body (411) arranged on the cylinder body (31), a valve seat (412) arranged in the valve body (411) and one end of which is in fit and seal with the cylinder body (31), a valve core (413) movably arranged in the valve body (411), a pressure regulating column (414) arranged on the valve body (411) in a sliding manner, an adjusting sleeve (415) arranged on the valve body (411) and a locking nut (416); the vent valve (42) is arranged on the valve core (413); and the valve seat (412), the valve core (413) and the valve body (411) are provided with backflow holes (417) communicated with the emptying channel (311).

4. A hydraulic diaphragm metering pump having a dual function valve block and an internal circulation pressure protection mechanism as claimed in claim 3, wherein: a centering block (418) and a spring (419) are also arranged between the pressure regulating column (414) and the valve core (413); the center of one end of the centering block (418) matched with the pressure regulating column (414) is provided with a conical head (420), and the pressure regulating column (414) is provided with a conical hole (421) matched with the conical head (420).

5. The hydraulic diaphragm metering pump with dual function valve set and internal circulation pressure protection mechanism of claim 4, wherein: a steel ball (428) is arranged at the center of the top of the pressure regulating column (414), and the pressure regulating column (414) is connected with the regulating sleeve (415) in a contact manner through the steel ball (428).

6. A hydraulic diaphragm metering pump having a dual function valve block and an internal circulation pressure protection mechanism as claimed in claim 3, wherein: the emptying valve (42) comprises a valve sleeve (422) arranged on the valve core (413), a push rod (423) movably arranged in the valve sleeve (422), a valve ball (425) arranged at one end of the push rod (423) and positioned in the valve sleeve (422), and a counterweight ball (426) arranged at the other end of the push rod (423); the ejector rod (423) is in clearance fit with the valve sleeve (422), and a passage port (427) matched with the valve ball (425) is further formed in the valve sleeve (422).

7. The hydraulic diaphragm metering pump with dual function valve set and internal circulation pressure protection mechanism of claim 1, wherein: the oil supplementing valve (5) comprises a shell (51) arranged on the cylinder body (31) and a one-way valve (52) arranged on the cylinder body (31) and positioned in the shell (51); a filter (53) is further arranged on the one-way valve (52), and the oil supplementing channel (312) is communicated with the shell (51).

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