CN217682234U - Pressure relief valve assembly for automatic pressure relief device in pump cavity of plunger pump - Google Patents

Abstract

A pressure release valve assembly for an automatic pressure relief device in a pump cavity of a plunger pump comprises a pressure relief cam arranged on an input shaft through a one-way bearing, a pressure relief valve core arranged on one side of the pressure relief cam and in contact with the pressure relief cam, a valve core spring sleeved on the pressure relief valve core, a valve inner top core arranged on one side of the pressure relief valve core and in contact with the pressure relief valve core, and a valve body, wherein a conducting strip is arranged on the end face, far away from the pressure relief cam, of one side of the valve inner top core, and a contact and the conducting strip arranged in the valve body form a mechanical switch for triggering a signal. This scheme has simple and convenient feasible, good reliability's advantage, and applicable plunger pump oil feeding system in any conventionality.

Description

Pressure relief valve assembly for automatic pressure relief device in pump cavity of plunger pump

Technical Field

The utility model relates to an oil pump release technical field specifically is an automatic relief valve subassembly for pressure relief device in plunger pump chamber.

Background

At present, the grease centralized lubrication technology is mainly applied to the fields of large vehicles, engineering machinery, wind power generation, industrial production and the like. In the lubricating process, the plunger pump supplies oil and pressurizes to the pipeline continuously when working, the oil pressure of the pipeline can be controlled by the preset pressure of the overflow valve, when the pressure exceeds the preset pressure, the grease can return to the oil tank through the overflow valve, the preset pressure is still kept in the pipeline, and in order to thoroughly unload the load, an unloading mechanism is required to completely unload the oil pressure pipeline. The conventional unloading mechanism is completed by an electromagnetic valve, and program-controlled pressure relief is carried out by the electromagnetic valve by opening a bypass serially connected with a pilot electromagnetic valve. When the electromagnetic valve is used for releasing pressure of the grease pump, the problem that the grease around the electromagnetic valve core is diluted and flows away more easily due to the fact that the electromagnetic valve core heats in operation, and some solidified substances are stuck on the valve core over time to cause incomplete pressure releasing of the electromagnetic valve is generally solved.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an automatic release valve assembly for device in plunger pump chamber.

The utility model adopts the technical proposal that: a pressure release valve assembly for an automatic pressure relief device in a pump cavity of a plunger pump comprises a pressure relief cam arranged on an input shaft through a one-way bearing, a pressure relief valve core arranged on one side of the pressure relief cam and in contact with the pressure relief cam, a valve core spring sleeved on the pressure relief valve core, a valve inner top core arranged on one side of the pressure relief valve core and in contact with the pressure relief valve core, and a valve body, wherein a conducting strip is arranged on the end face, far away from the pressure relief cam, of one side of the valve inner top core, and a contact and the conducting strip arranged in the valve body form a mechanical switch for triggering a signal.

Preferably, the conducting strip is embedded in an installation groove at the end part of the top core in the valve.

Preferably, the valve inner top core is further sleeved with a top core spring, when the controller closes the pressure relief pipeline, the valve inner top core automatically resets under the action of the top core spring, the conducting strip is separated from the contact, and the mechanical switch outputs a closing signal.

As a preferable scheme, a sealing sleeve is further sleeved on the valve inner ejecting core, one end of the sealing sleeve abuts against one side face of the ejecting core spring, when the valve core spring drives the pressure relief valve core to reset, the valve inner ejecting core automatically resets under the action of the ejecting core spring, and the sealing sleeve synchronously moves along with the valve inner ejecting core and closes a channel of the oil supply pipeline for discharging oil to the pressure relief valve core.

Preferably, a wiring terminal is further arranged outside the valve body, and an output signal of the mechanical switch is led out through the wiring terminal.

The utility model has the advantages that:

this scheme is through the structural design of innovation, has optimized relief valve assembly's structural component, and concrete structure is: the pressure relief valve assembly is internally provided with a mechanical switch which is composed of a conducting strip and a contact and used for triggering a signal, the time of sending a signal by the mechanical switch is synchronous with the time of starting pressure relief of the pressure relief valve assembly, meanwhile, in order to better realize the control process, the conducting strip is arranged at the end part of a top core in the valve, when a pressure relief cam drives a pressure relief valve core to act, the pressure relief valve core drives the top core in the valve to move, and the conducting strip is enabled to act synchronously and is communicated with the contact, a top core spring is further sleeved on the top core in the valve, when a controller closes a pressure relief pipeline, the top core in the valve automatically resets under the action of the top core spring, the conducting strip is separated from the contact, a closing signal is led out through a wiring terminal, secondly, in order to better close the pressure relief channel, a sealing sleeve is further sleeved on the top core in the valve, one end of the sealing sleeve is tightly propped against one side surface of the top core spring, when the pressure relief valve core spring drives the pressure relief valve core to reset, the top core in the valve automatically resets under the action of the top core spring, the sealing sleeve synchronously moves along with the top core in the valve and closes an oil supply channel of the pressure relief valve core, and the pressure relief valve core in the pressure relief valve, and the pressure relief valve assembly has the advantage of good reliability.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

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

fig. 2 is a schematic structural diagram of the present invention in an implementation state.

Detailed Description

The present invention will now be described in detail by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

It should be noted that: unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of the words "a," "an," or "the" and similar referents in the specification and claims of the present application does not imply a limitation of quantity, but rather indicates the presence of at least one. The word "comprise" or "comprises", and the like, indicates that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, but does not exclude other elements or items having the same function.

The detailed structure and working process of the scheme are described in the following with reference to the attached drawings 1-2:

as shown in fig. 1, the pressure relief valve assembly 5 includes a pressure relief cam 23 disposed on an input shaft through a one-way bearing, a pressure relief valve core 51 disposed on one side of the pressure relief cam 23 and contacting with the pressure relief cam 23, a valve core spring 53 sleeved on the pressure relief valve core 51, a valve inner core 54 disposed on one side of the pressure relief valve core and contacting with the pressure relief valve core, and a valve body 52, wherein a conductive sheet 57 is disposed on an end surface of the valve inner core 54 on one side away from the pressure relief cam 23, a contact 56 disposed in the valve body 52 and the conductive sheet 57 form a mechanical switch for triggering a signal, the mechanical switch outputs a conducting or closing signal to a controller, and the controller outputs different control commands according to conditions;

in this embodiment, the valve inner core 54 is further sleeved with a core spring 55, and when the controller closes the pressure relief pipeline, the valve inner core 54 automatically resets under the action of the core spring 55; when the high dead point of the pressure relief cam 23 contacts with the pressure relief valve core 51, the valve core pressure relief oil hole 511 coincides with the oil return hole 521 on the valve body, at this time, the pressure relief oil hole 511 is connected with the oil supply pipeline 12 through an oil passage formed in the pressure relief valve core 51, the oil passage starts to relieve pressure, and at this time, the conducting strip 57 conducts the contact 56. The conduction signal is led out through the wiring terminal 531 and transmitted to the controller;

when pressure relief is not needed, the pressure relief cam 23 rotates reversely for a half circle, the low dead center of the pressure relief cam is contacted with the pressure relief valve core 51, and under the action of the valve core spring 53, the valve core spring 53 drives the pressure relief valve core 51 to move left, so that the pressure relief oil hole 511 is closed. At the same time, the valve inner top core 54 closes the oil discharging passage from the oil supply line 12 to the pressure relief valve core 511 under the action of the top core spring 55. At the same time as the conductive tab 57 disengages the contact 56. The close signal is led out through the wiring terminal 531 and transmitted to the controller.

In this embodiment, the valve inner top core 54 is further sleeved with a sealing sleeve 58, one end of the sealing sleeve 58 is tightly pressed against one side surface of the top core spring 55, when the valve core spring drives the pressure relief valve core to reset, the valve inner top core automatically resets under the action of the top core spring, and the sealing sleeve 58 synchronously moves along with the valve inner top core 54 and closes a passage of the oil supply pipeline to discharge oil to the pressure relief valve core.

As shown in fig. 2, the structure of the present invention in the practical implementation state is schematically shown,

the pump mainly comprises a pump shell 1, a power input assembly 2, a plunger assembly 3, an overflow valve assembly 4, a pressure relief valve assembly 5, an oil pressure sensor 6 and a controller connected with the oil pressure sensor; the pump shell 1 is provided with a cavity for storing lubricating grease, the grease in the portable oil box is pressed into the pump cavity through an oil guide pipe and a pressure oil disc assembly, the power input assembly 2 provides power to pump the grease in the pump cavity into an oil supply pipeline 12 through a plunger assembly 3, the overflow valve assembly 4, the pressure relief valve assembly 5 and the oil pressure sensor 6 are sequentially arranged on the oil supply pipeline 12, and the signal output end of the oil pressure sensor 6 is connected with a controller;

the power input assembly 2 includes a driving motor, an input shaft, a plunger cam arranged on the input shaft and rotating synchronously with the input shaft, and a pressure relief cam arranged on the input shaft through a one-way bearing, and it is described that: the parts of a driving motor are not shown in the attached drawings, the connection mode of the driving motor and an input shaft is an existing mature structure and is not described one by one, a power input shaft drives a plunger valve core in a plunger assembly to reciprocate through a coaxial plunger cam of the power input shaft, grease is continuously pumped into an oil supply pipeline 12, when a preset value of an oil pressure sensor 6 is reached, the oil pressure sensor 6 transmits a signal to a controller, the controller performs pressure maintaining countdown, the pressure maintaining function is to ensure that the grease is fully transmitted to all lubricating points in the oil supply pipeline 12, and the pressure maintaining time is set according to the actual condition of the total length of the pipeline;

in the pressure maintaining time, if the pressure in the oil supply pipeline 12 is over-pressure, that is, the pressure in the oil supply pipeline 12 exceeds the preset pressure value of the overflow valve assembly 4, the grease in the oil supply pipeline 12 will push the overflow valve assembly 4 open, and flow back into the pump housing 1 through the oil return hole on the overflow valve assembly 4;

after the pressure-holding countdown is finished, the controller gives a reversal signal to the driving motor, the input shaft reverses half a circle, the pressure relief cam 23 fixed on the input shaft pushes the pressure relief valve core 51 of the pressure relief valve assembly 5 to move in the rotating process, at the moment, the high dead point of the pressure relief cam 23 on the pressure relief assembly 5 is contacted with the pressure relief valve core 51, the pressure relief valve core 51 is jacked to a pressure relief position, at the moment, a pressure relief hole 511 on a pressure relief valve body 52 on the pressure relief valve core 51 is aligned with an oil return hole 521 on the pressure relief valve body 52, the pressure relief action is started, meanwhile, a mechanical switch 53 on the pressure relief assembly is switched on, a signal for starting pressure relief is sent to the controller through a lead led out by a wiring terminal 531, and the controller starts to perform pause countdown;

in the pressure relief process, grease in the oil supply pipeline 12 returns to the pump shell 1 through the middle pressure relief hole 511 of the pressure relief valve core 51 and the oil return hole 521 of the pressure relief valve body in sequence, and at the moment, the oil supply pipeline 12 realizes complete pressure relief. Even though the plunger assembly 4 pumps oil to the oil supply line 12 during this process, the pressure relief line is open and therefore does not pressurize the line. After the pause countdown is finished, the controller starts to send out an oil pumping command, firstly, the pressure relief pipeline is closed, and the actions are as follows: firstly, giving a signal of a reverse half-turn to the driving motor, rotating the input shaft to enable the low dead point of the pressure relief cam 23 to contact the pressure relief valve core 51, and at the moment, disengaging a pressure relief hole 511 on the pressure relief valve core from an oil return hole 521 of the pressure relief valve body, and closing the pipeline; after the pressure relief pipeline is closed, a signal for positive rotation of the motor is sent, and oil is continuously pumped into the oil supply pipeline 12.

In the embodiment, because the pressure relief cam 23 is connected with the power input shaft by adopting the one-way bearing, the structure realizes that the driving motor can not drive the pressure relief cam 23 to rotate when the driving motor rotates forwards to drive the plunger cam to act.

It should be noted that, although the present invention has been described with reference to the above embodiments, the present invention may have other embodiments. Various modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention, and it is intended that all such modifications and changes fall within the scope of the appended claims and their equivalents.

Claims (5)

1. The utility model provides an automatic release device relief valve subassembly in plunger pump chamber which characterized in that: the pressure relief valve comprises a pressure relief cam arranged on an input shaft through a one-way bearing, a pressure relief valve core arranged on one side of the pressure relief cam and in contact with the pressure relief cam, a valve core spring sleeved on the pressure relief valve core, an inner valve core arranged on one side of the pressure relief valve core and in contact with the pressure relief valve core, and a valve body, wherein a conducting strip is arranged on the end face of one side of the inner valve core, which is far away from the pressure relief cam, and a contact arranged in the valve body and the conducting strip form a mechanical switch for triggering a signal.

2. The pressure relief valve assembly for an automatic pressure relief device in a pump chamber of a plunger pump of claim 1, wherein: the conducting strip is embedded in an installation groove at the end part of the top core in the valve.

3. A pressure relief valve assembly for an automatic pressure relief device in a pump chamber of a plunger pump according to claim 1 or 2, wherein: the valve inner ejection core is also sleeved with an ejection core spring, when the controller closes the pressure relief pipeline, the valve inner ejection core automatically resets under the action of the ejection core spring, the conducting strip is separated from the contact, and the mechanical switch outputs a closing signal.

4. A pressure relief valve assembly for an automatic pressure relief device in a pump chamber of a plunger pump according to claim 3, wherein: the valve inner ejection core is further sleeved with a sealing sleeve, one end of the sealing sleeve abuts against one side face of the ejection core spring, when the valve core spring drives the pressure relief valve core to reset, the valve inner ejection core automatically resets under the action of the ejection core spring, and the sealing sleeve synchronously moves along with the valve inner ejection core and closes a channel of the oil supply pipeline for oil relief of the pressure relief valve core.

5. The pressure relief valve assembly for an automatic pressure relief device in a pump chamber of a plunger pump according to claim 1, wherein: and a binding post is also arranged outside the valve body, and an output signal of the mechanical switch is led out through the binding post.

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