CN212454782U - Small-flow miniature three-cylinder plunger pump - Google Patents

Abstract

A small-flow miniature three-cylinder plunger pump comprises a pump body, wherein a water inlet pipeline and a water outlet pipeline are arranged in the pump body, and the water outlet pipeline is externally connected with a water outlet joint. The scheme has the advantages of compact structure, sensitive unloading stop motion, good pressure maintaining performance and low requirement on the starting performance of the motor.

Description

Small-flow miniature three-cylinder plunger pump

Technical Field

The utility model relates to a miniature triplex plunger pump of low discharge belongs to water pump technical field, among the mainly used cleaning equipment.

Background

The overflow structure of the existing small-flow three-cylinder plunger pump for the cleaning machine mainly comprises a check valve, a valve sleeve, a valve core, a push rod, a microswitch and other components arranged in a cylinder body. When the spray gun of the cleaning machine is closed, the pressure in the pump rises, the valve sleeve overflows and unloads, the valve core pushes the push rod to move, the push rod pushes the contact on the micro switch to break a circuit, and the machine stops working when power is off. The disadvantages are that: firstly, an overflow unloading channel is formed by a gap between a valve sleeve and a valve core, and if the gap is too small, the valve core is easy to be blocked; if the clearance is too large, the pressure is relieved too fast, so that the internal pressure is insufficient, the valve core cannot be pushed to move downwards, and the power failure and shutdown cannot be caused; secondly, the pressure at the front end of the check valve cannot be quickly released, so that poor sealing of the check valve is easily caused; and thirdly, because the pressure at the front end of the check valve can not be quickly released, a little pressure exists in the pump in a short time, and the requirement on the starting performance of the motor is high.

Disclosure of Invention

The utility model aims at overcoming the shortcoming of prior art, providing a compact structure, the off-load is shut down the action sensitive, and the pressurize performance is good, requires a low miniature triplex plunger pump of low discharge to the startability of motor.

The utility model relates to a miniature three jar plunger pumps of low discharge's technical scheme is: the water pump is characterized in that a check valve is arranged in the water outlet pipeline, a spring is arranged at the outer end of the check valve and is propped against the water outlet connector, an overflow valve is arranged in the water inlet pipeline, an overflow nut is arranged at the head of the overflow valve, a micro switch shell is arranged on the outer wall of the pump body, a push rod and a micro switch are arranged in the micro switch shell, one end of the push rod is matched with a contact of the micro switch, and one end of the push rod is matched with a valve core of the overflow valve.

The utility model discloses a miniature triplex plunger pump of low discharge, after the spray gun was closed, pump internal pressure rose, and overflow valve overflow off-load, water under high pressure off-load to water intake pipe (low pressure region), in the off-load in-process, the case in the overflow valve promoted the push rod motion, and the push rod promotes the contact open circuit on the micro-gap switch again, and the machine outage stop work. At the moment, high-pressure water which is not unloaded in the water outlet pipeline flows into the water inlet pipeline through the overflow valve through the check valve with the pressure limiting function, and a certain water pressure is reserved in the water outlet pipeline because the check valve has the pressure limiting function, and the water pressure can normally maintain the overflow valve in an open state, so that the machine is maintained in a power-off shutdown state. The scheme has the advantages of compact structure, sensitive unloading stop motion, good pressure maintaining performance and low requirement on the starting performance of the motor.

Drawings

Fig. 1 is a schematic structural view of a small-flow miniature three-cylinder plunger pump of the present invention.

Detailed Description

The utility model relates to a miniature three jar plunger pumps of low discharge, as shown in figure 1, including the pump body 1, set up water intake pipe 2 and outlet pipe way 3 in the pump body, the external water connectors 5 that goes out of outlet pipe way, outlet pipe way 3 in set up check valve 6, the outer end of check valve sets up spring 7, spring 7 pushes up on water connectors 6, water intake pipe 2 in set up overflow valve 8, the head of overflow valve sets up overflow nut 9, set up micro-gap switch casing 10 at the outer wall of the pump body 1, set up push rod 11 and micro-gap switch 12 in the micro-gap switch casing 10, one end of push rod 11 cooperatees with micro-gap switch 12's contact 13, one end of push rod 11 cooperatees with case (15) of overflow valve (8). When the spray gun is closed, the pressure in the pump rises, the overflow valve 8 overflows and unloads, high-pressure water is unloaded to the water inlet pipeline 2 (low-pressure area), in the unloading process, the valve core 15 in the overflow valve 8 pushes the push rod 11 to move, the push rod 11 pushes the contact 13 on the microswitch 12 to break a circuit, and the machine stops working when power is cut off. At the moment, high-pressure water which is not unloaded in the water outlet pipeline flows into the water inlet pipeline 2 through the overflow valve 8 through the check valve 6 with the pressure limiting function, and a certain water pressure is reserved in the water outlet pipeline because the check valve 6 with the pressure limiting function, and the water pressure can normally maintain the overflow valve 8 in an open state, so that the machine is maintained in a power-off shutdown state. The scheme has the advantages of compact structure, sensitive unloading stop motion, good pressure maintaining performance and low requirement on the starting performance of the motor.

Claims (1)

1. A small-flow miniature three-cylinder plunger pump comprises a pump body (1), wherein a water inlet pipeline (2) and a water outlet pipeline (3) are arranged in the pump body, the water outlet pipeline is externally connected with a water outlet joint (5), and is characterized in that a check valve (6) is arranged in the water outlet pipeline (3), a spring (7) is arranged at the outer end of the check valve, the spring (7) abuts against the water outlet joint (5), an overflow valve (8) is arranged in the water inlet pipeline (2), an overflow nut (9) is arranged at the head of the overflow valve, a microswitch shell (10) is arranged on the outer wall of the pump body (1), a push rod (11) and a microswitch (12) are arranged in the microswitch shell (10), one end of the push rod (11) is matched with a contact (13) of the microswitch (12), and one end of the push rod (11) is matched with a valve core (15).

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