CN210637557U - Exhaust valve assembly for automatic exhaust valve and diaphragm pump - Google Patents

Abstract

The utility model discloses an automatic exhaust valve, which comprises a valve body provided with an automatic exhaust channel; the self-exhaust channel in the valve body comprises a reducing channel and a bypass channel; a valve core is arranged in the big end, and a gas storage gap is reserved between the valve core and the inner wall of the big end; a return spring is arranged in the small end; when the return spring is in a compressed state, the valve core is pressed against the small end, so that the self-exhaust channel is closed and the inlet end is opened, and gas can flow into the gas storage gap; when the reset spring is in an extension state, the valve core can be pressed on the inlet end of the valve body, and an overflowing gap is formed between the valve core and the small end, so that the inlet end is closed, the self-exhaust channel is opened, and gas in the gas storage gap is exhausted through the overflowing gap and the bypass channel. Also discloses an exhaust valve assembly for the diaphragm pump, which adopts the design of separating micro exhaust from a large amount of exhaust, and the micro exhaust is automatically carried out through an automatic exhaust valve. The utility model provides an easy technical problem who takes place to leak and block up.

Description

Exhaust valve assembly for automatic exhaust valve and diaphragm pump

Technical Field

The utility model relates to a diaphragm pump technical field especially relates to a discharge valve assembly for diaphragm pump.

Background

The diaphragm pump separates the fluid to be transported from the piston member by means of a membrane, so that the piston member is not in contact with the transport medium. One side of the diaphragm is provided with a hydraulic oil cavity, and the other side of the diaphragm is provided with a conveying cavity. The diaphragm pump drives the diaphragm to reciprocate through the reciprocating motion of the piston on the hydraulic oil cavity side, so that an inlet valve and a discharge valve on the hydraulic end on the other side of the diaphragm are driven to be alternately opened and closed, reciprocating liquid inlet and discharge are realized, and medium conveying is realized. An exhaust valve is arranged on a hydraulic oil cavity of the diaphragm pump, and when gas appears in the hydraulic oil cavity, the gas can be exhausted through the exhaust valve. During normal work, gas can be generated in the hydraulic oil cavity, abnormal sound and vibration of the pump are caused when the gas is serious, and therefore the gas needs to be exhausted to ensure the normal operation of the pump; when in a commissioning state, a large amount of venting or oil drainage is required.

Referring to fig. 1, the conventional exhaust valve has the following defects that two passages, i.e., a large-hole passage 1a and a small-gap passage 1b, are respectively provided for a large amount of exhaust and a small amount of exhaust: 1) the valve is in threaded connection with the pump head hydraulic cylinder, so that the sealing reliability is poor and the leakage is easy to occur; 2) the positions of an oil pipe and a large hole and a small hole are corresponded by rotating the adjusting screw rod 1c, an O-shaped sealing ring is adopted between the adjusting screw rod 1c and the valve body, and the O-shaped sealing ring is easy to damage after being rotated for many times, so that leakage occurs; 3) the micro-exhaust adopts clearance control, has high processing requirement, has larger difference of processing clearance, and the clearance is easy to block when the oil is not clean, thereby influencing the use effect.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the technology, the invention provides an automatic exhaust valve which solves the technical problem that in the prior art, leakage is easy to occur due to the fact that a sealing ring is damaged due to repeated adjustment. An exhaust valve assembly for a diaphragm pump solves the technical problems of easy leakage and blockage in the prior art.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: an automatic exhaust valve comprises a valve body provided with an automatic exhaust channel; the self-exhaust channel in the valve body comprises a reducing channel and a bypass channel; the big end of the reducing channel is used as the inlet end of the valve body, and the bypass channel is used as the outlet end of the valve body; a valve core is arranged in the big end, and a gas storage gap is reserved between the valve core and the inner wall of the big end; the small end of the reducing channel is communicated with the bypass channel, and a return spring is arranged in the small end; when the return spring is in a compressed state, the valve core can be pressed against the small end, so that the self-exhaust channel is closed and the inlet end is opened, and gas can flow into the gas storage gap; when the reset spring is in an extension state, the valve core can be pressed on the inlet end of the valve body, and an overflowing gap is formed between the valve core and the small end, so that the inlet end is closed, the self-exhaust channel is opened, and gas in the gas storage gap is exhausted through the overflowing gap and the bypass channel.

An exhaust valve assembly for a diaphragm pump comprises a valve seat used for connecting a hydraulic oil cavity of the diaphragm pump, wherein an air inlet channel, a large-displacement channel and a micro-displacement channel which are communicated with each other are arranged in the valve seat; the outlet end of the micro-displacement channel is connected with the automatic exhaust valve; the inlet end of the self-exhaust channel of the automatic exhaust valve is butted with the micro-displacement channel, so that the automatic exhaust valve can automatically exhaust according to the change of air pressure in the valve seat; the outlet end of the automatic exhaust valve is connected with a micro-displacement oil pipe; the outlet end of the large-displacement channel is connected with a stop valve, and the outlet end of the stop valve is respectively communicated with the micro-displacement oil pipe and the large-displacement oil pipe through a tee joint.

Compared with the prior art, the utility model has the advantages of include:

1. the valve core of the automatic exhaust valve can compress the return spring under the action of higher internal pressure, so that gas can flow into the gas storage gap, and the self-exhaust channel is in a closed state at the moment, so that a large amount of oil can not be discharged in the liquid discharging process of the diaphragm pump; when the internal pressure borne by the valve core is reduced, the reset spring is extended and reset due to elastic potential energy, and when the reset spring is in an extended state, the valve core can be pressed on the inlet end of the valve body and an overflowing gap is formed between the valve core and the small end, so that the inlet end is closed and the self-exhaust channel is opened, and gas in the gas storage gap is exhausted through the overflowing gap and the bypass channel; thus, automatic venting is achieved.

2. The automatic exhaust channel of the automatic exhaust valve is not required to be provided with a sealing ring, so that the phenomenon of leakage caused by the damage of the sealing ring is avoided. Compared with the small-gap exhaust in the prior art, the self-exhaust channel is not easy to block, and the space of the exhaust channel is larger.

3. Because can be under the internal pressure change automatic exhaust (the passageway has gas to exhaust, does not have gas oil extraction), just adapted to the working process of diaphragm pump: the diaphragm pump flowing back process leads to interior pressure to rise, and the diaphragm pump imbibition process leads to interior pressure to descend, consequently, just can be fine satisfy the trace exhaust demand in the normal working process of diaphragm pump.

4. The diaphragm pump mostly uses micro-exhaust, and only a few cases need to perform large-amount exhaust. The exhaust valve assembly for the diaphragm pump adopts the design of separating the micro exhaust from a large amount of exhaust, and the micro exhaust is automatically carried out through the automatic exhaust valve without manual regulation and control; when switching to a large amount of exhaust states, open the stop valve can to the stop valve is external, and the operation is very simple directly perceived. However, in the prior art, both a small amount of exhaust gas and a large amount of exhaust gas are integrated inside, and when the exhaust state is switched, visibility is poor, and the requirement on the experience level of an operator is high.

Drawings

FIG. 1 is a prior art exhaust valve for a built-in integrated pump;

FIG. 2 is a vent valve assembly for a diaphragm pump according to the present embodiment;

fig. 3 is a partially enlarged view of the automatic exhaust valve of fig. 2.

Detailed Description

Referring to fig. 2, a vent valve assembly for a diaphragm pump comprises a valve seat 2 for connecting a hydraulic oil chamber of the diaphragm pump, wherein an air inlet channel 201, a large displacement channel 203 and a micro displacement channel 202 which are communicated with each other are arranged in the valve seat 2; the outlet end of the micro-displacement channel 202 is connected with an automatic exhaust valve 1; the inlet end of the self-exhaust channel of the automatic exhaust valve 1 is butted with the micro-displacement channel 202, so that the automatic exhaust valve 1 can automatically exhaust according to the change of the pressure in the valve seat 2; the outlet end of the automatic exhaust valve 1 is connected with a micro-displacement oil pipe 5; the outlet end of the large discharge channel 203 is connected with a stop valve, and the outlet end of the stop valve is respectively communicated with the micro-discharge oil pipe 5 and the large discharge oil pipe 6 through a tee joint 4.

And (3) under the normal working state of the diaphragm pump (the stop valve is kept closed): the pressure in the valve seat 2 is increased in the liquid discharging process of the diaphragm pump, the valve core can compress the return spring under the internal pressure higher than the external atmospheric pressure, so that gas can flow into the gas storage gap, and a large amount of oil can not be discharged in the liquid discharging process of the diaphragm pump because the self-exhaust channel is in a closed state; when the internal pressure of the valve core is lower than a certain degree, the reset spring is extended and reset due to elastic potential energy, and when the reset spring is in an extended state, the valve core can be pressed on the inlet end of the valve body and an overflowing gap is formed between the valve core and the small end, so that the inlet end is closed and the self-exhausting channel is opened, and gas in the gas storage gap is exhausted through the overflowing gap and the bypass channel; thus, automatic air exhaust under the change of air pressure is realized.

The structure of the automatic exhaust valve 1 is shown in figure 3, and comprises a valve body provided with a self-exhaust channel; the self-exhaust channel in the valve body comprises a reducing channel 101 and a bypass channel 102; the big end of the reducing channel 101 is used as the inlet end of the valve body, and the bypass channel 102 is used as the outlet end of the valve body; a valve core 104 is arranged in the big end, and a gas storage gap is reserved between the valve core 104 and the inner wall of the big end; the small end of the reducing channel 101 is communicated with the bypass channel 102, and a return spring 103 is arranged in the small end; when the return spring 103 is in a compressed state, the valve core 104 is pressed against the small end, so that the self-exhaust channel is closed and the inlet end is opened, and gas can flow into the gas storage gap; when the return spring 103 is in an extended state, the valve core 104 can be pressed against the inlet end of the valve body, and an overflow gap is formed between the valve core and the small end, so that the inlet end is closed and the self-exhaust channel is opened, and gas in the gas storage gap is exhausted through the overflow gap and the bypass channel 102.

In order to simplify the structure, facilitate the installation and improve the leakproofness: the valve body of the automatic exhaust valve is assembled on the valve seat, a port communicated with the large end of the reducing channel is arranged in the valve body of the automatic exhaust valve, and the outlet end of the micro-displacement channel 202 is clamped in the port; bolt connecting holes (only bolt axes are shown in 3) are circumferentially distributed on the valve body of the automatic exhaust valve, so that the automatic exhaust valve and the valve seat 2 can be connected to the diaphragm pump body through bolts. The automatic exhaust valve is sealed with the outlet end of the micro-displacement channel 202 by a sealing ring 105.

The valve core in the automatic exhaust valve 1 and the one-way valve structure can adopt a valve ball, a valve column or a valve cone.

The intake passage 201, the large displacement passage 203, and the micro displacement passage 202 are disposed at the lower portion, the middle portion, and the upper portion of the valve seat 2, respectively. Therefore, the automatic exhaust valve 1 and the valve seat 2 are both in the vertical direction, so that the automatic exhaust valve 1 and the return spring in the one-way valve structure can be reset more quickly under the action of gravity of the valve core, and the risk of resetting failure caused by the elasticity weakening of the return spring can be reduced.

Claims (6)

1. An automatic exhaust valve which is characterized in that: comprises a valve body provided with a self-exhaust channel; the self-exhaust channel in the valve body comprises a reducing channel and a bypass channel; the big end of the reducing channel is used as the inlet end of the valve body, and the bypass channel is used as the outlet end of the valve body; a valve core is arranged in the big end, and a gas storage gap is reserved between the valve core and the inner wall of the big end; the small end of the reducing channel is communicated with the bypass channel, and a return spring is arranged in the small end; when the return spring is in a compressed state, the valve core can be pressed against the small end, so that the self-exhaust channel is closed and the inlet end is opened, and gas can flow into the gas storage gap; when the reset spring is in an extension state, the valve core can be pressed on the inlet end of the valve body, and an overflowing gap is formed between the valve core and the small end, so that the inlet end is closed, the self-exhaust channel is opened, and gas in the gas storage gap is exhausted through the overflowing gap and the bypass channel.

2. The automatic exhaust valve according to claim 1 wherein: the valve core is a valve ball, a valve column or a valve cone.

3. The utility model provides a discharge valve assembly for diaphragm pump which characterized in that: the diaphragm pump comprises a valve seat used for connecting a hydraulic oil cavity of a diaphragm pump, wherein an air inlet channel, a large-displacement channel and a micro-displacement channel which are communicated with each other are arranged in the valve seat; the outlet end of the micro-displacement channel is connected with the automatic exhaust valve as claimed in claim 1; the inlet end of a self-exhaust channel of the automatic exhaust valve is butted with the micro-displacement channel, so that the automatic exhaust valve can automatically exhaust according to the change of the pressure in the valve seat; the outlet end of the automatic exhaust valve is connected with a micro-displacement oil pipe; the outlet end of the large-displacement channel is connected with a stop valve, and the outlet end of the stop valve is respectively communicated with the micro-displacement oil pipe and the large-displacement oil pipe through a tee joint.

4. The vent valve assembly for a diaphragm pump of claim 3, wherein: the valve body of the automatic exhaust valve is assembled on the valve seat; a valve body of the automatic exhaust valve is internally provided with a connector communicated with the large end of the reducing channel, and the outlet end of the micro-displacement channel is clamped in the connector; bolt connecting holes are circumferentially distributed on the valve body of the automatic exhaust valve, so that the automatic exhaust valve and the valve seat can be connected to the diaphragm pump body through bolts.

5. The vent valve assembly for a diaphragm pump of claim 4, wherein: and a sealing element is arranged between the valve body and the valve seat.

6. The vent valve assembly for a diaphragm pump of claim 3, wherein: the air inlet channel, the large-displacement channel and the micro-displacement channel are respectively arranged at the lower part, the middle part and the upper part of the valve body.

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