JP2021188537A - Reciprocation piston pump - Google Patents

Abstract

To make flows of used liquids smoothly and efficiently flow from through-holes of a water absorption valve seat at the seat separation of a water absorption valve, to alleviate an impact at the seating of the water absorption valve, to prevent the generation of a pulsation at the seat separation of the water absorption valve, and to reduce noise.SOLUTION: A plurality of through-holes 27 separated from one another at equal intervals along a peripheral direction, and making fore-and-aft positions in an axial line direction communicate with each other are formed at a water absorption valve seat 22b, and a recessed groove 28 for circularly connecting front ends of the though-holes 27 in the axial line direction is formed. By this constitution, used liquids flowing out of the plurality of through-holes 27 at the seat separation of a water absorption valve 21 are aggregated once into a ring shape by the recessed groove 28 which connects the though-holes 27 in the peripheral direction, and made to abut on the water absorption valve 21, and the water absorption valve 21 is seat-separated by a uniform force. Since the used liquid stays in the recessed groove 28 at the seating of the water absorption valve 21, the water absorption valve seat can alleviate an impact as a cushion substitute. Also, a water film is prevented from being cut at the seating of the water absorption valve 21 by the recessed groove 28, a vacuum phenomenon between the water absorption valve 21 and the water absorption valve seat 22b is alleviated, and a pasting phenomenon is thereby suppressed.SELECTED DRAWING: Figure 4

Description

The present invention relates to a reciprocating piston pump.

Conventionally, as a reciprocating piston pump in which a piston reciprocates in a cylinder, the one described in Patent Document 1 below is known. In the reciprocating piston pump described in Patent Document 1, a piston rod is connected to a crank shaft pivotally supported by a crank case, and a cylindrical piston packing (reciprocating in a cylinder) is attached to the tip of the piston rod. The piston) is connected, and the piston packing is provided with a packing that is in sliding contact with the cylinder in an annular shape on the outer peripheral side thereof.

In the piston packing, a plurality of through holes penetrating the front and rear in the axial direction are formed on the inner peripheral side of the packing along the circumferential direction, and a water absorption valve seat is formed at the end facing the front side in the axial direction. ing. At the tip of the piston rod, a cylindrical water absorption valve (valve body) is arranged so as to be movable in the axial direction on the front side in the axial direction from the piston packing, and a cylindrical stopper is placed on the front side in the axial direction from the water absorption valve. It is fixed, and a spring that presses the water absorption valve so as to sit (seat) on the water absorption valve seat is arranged between the stopper and the water absorption valve.

Then, during the water absorption process of the reciprocating piston pump, the piston rod moves backward in the axial direction, the water absorption valve separates from the water absorption valve seat against the pressing force of the spring, and the liquid used from the water absorption port is discharged. It flows forward from the piston packing in the axial direction through the through hole and the gap between the water absorption valve and the water absorption valve seat.

When switching to the discharge process, the piston rod moves forward in the axial direction, and the water absorption valve sits on the water absorption valve seat and closes the through hole. Then, the working liquid located in front of the piston packing in the axial direction is pressurized, the discharge valve arranged in front of the stopper in the axial direction is opened, and the working liquid is discharged from the discharge port to the outside through the discharge valve. It has become like.

Jitsukaisho 61-181881

Here, in the reciprocating piston pump, when the water absorption valve leaves the water absorption valve seat during the water absorption process, the flow of the liquid used from the through hole of the water absorption valve seat can be smoothly and efficiently flowed. It is desired. Further, it is required to alleviate the impact when the water absorption valve sits on the water absorption valve seat during the discharge process. In addition, when the water absorption valve is seated on the water absorption valve seat during the discharge process, the water film is cut by the contact between the flat surfaces, so that a vacuum phenomenon occurs between the water absorption valve and the water absorption valve seat and the sticking phenomenon occurs. This occurs, and when the water absorption valve leaves the water absorption valve seat during the water absorption process, pulsation occurs and noise increases.

The present invention has been made to solve such a problem, and when the water absorption valve is released, the flow of the working liquid from the through hole of the water absorption valve seat can be smoothly and efficiently flowed. Further, it is an object of the present invention to provide a reciprocating piston pump capable of alleviating the impact when the water absorption valve is seated, preventing the occurrence of pulsation when the water absorption valve leaves the seat, and reducing noise. do.

The reciprocating piston pump (100) according to the present invention has a piston rod (7) whose rear end side in the axial direction is connected to the drive unit (9) and reciprocates in the cylinder (3), and a piston rod (cylindrical). It is held in an annular shape on the outer peripheral side of the water absorption valve seat (22b) and the water absorption valve seat (22b) having a plurality of through holes (27) that are fitted and fixed to 7) and communicate with each other in the axial direction. A piston packing (22) having a packing (22a) made of an elastic body that is in sliding contact with the inner peripheral surface of the cylinder (3) and a cylindrical shape are externally attached to the piston rod (7) so as to be movable in the axial direction. A water absorption valve (21) and a water absorption valve (21) that are located on the front side in the axial direction of the water absorption valve seat (22b) and open and close the through hole (27) by being seated / seated with respect to the water absorption valve seat (22b). A reciprocating piston pump (100) provided with a pressing means (23) for pressing the water absorption valve seat (22b) so as to be seated, and the through hole (27) of the water absorption valve seat (22b) is in the circumferential direction. A recessed groove (28) recessed rearward in the axial direction is provided at the front end in the axial direction of the plurality of through holes (27) on the front end in the axial direction of the water absorption valve seat (22b). It is characterized by being provided in an annular shape so as to be connected.

According to such a reciprocating piston pump (100), in the water absorption valve seat (22b), a plurality of water absorption valve seats (22b) are arranged at equal intervals along the circumferential direction and are provided with through holes (27) that communicate with each other in the axial direction. Since the concave groove (28) connecting the axial front ends of these plurality of through holes (27) in an annular shape is provided on the axial front surface, the water absorption valve (21) is separated from the water absorption valve seat (22b). At that time, the liquid used from the plurality of through holes (27) of the water absorption valve seat (22b) is once collected in a ring shape by the concave groove (28) connecting the through holes (27) in the circumferential direction. The water absorption valve (21) can be separated from the water absorption valve (21) with a uniform force by hitting the water absorption valve (21), so that the flow of the working liquid is smooth and the working liquid is efficiently flowed. Further, since the water absorption valve (21) can be separated from the seat with a uniform force in this way, the water absorption valve (21) is prevented from tilting. Further, when the water absorption valve (21) is seated on the water absorption valve seat (22b), the liquid used stays in the recessed groove (28) connecting the front end of the through hole (27) of the water absorption valve seat (22b) in the circumferential direction. Because it is used, it acts as a cushion and cushions the impact. Further, the concave groove (28) provided on the front surface of the water absorption valve seat (22b) in the axial direction prevents the water absorption valve (21) from cutting the water film when seated on the water absorption valve seat (22b). The vacuum phenomenon between the water absorption valve (21) and the water absorption valve seat (22b) is alleviated and the sticking phenomenon is suppressed. As a result, when the water absorption valve (21) is separated from the water absorption valve seat (22b), the generation of pulsation is prevented and the noise is reduced.

Here, as a configuration that effectively exerts the above-mentioned action, specifically, a configuration in which the through hole (27) is an elongated hole forming an arc shape in the axial direction can be mentioned. According to this configuration, the above-mentioned effect is further enhanced as compared with the circular hole.

As described above, according to the present invention, when the water absorption valve is released from the seat, the flow of the working liquid from the through hole of the water absorption valve seat can be smoothly and efficiently flowed, and the water absorption valve can be prevented from tilting. It is possible to provide a reciprocating piston pump capable of alleviating the impact when the water absorption valve is seated, preventing the occurrence of pulsation when the water absorption valve is released from the seat, and reducing noise.

It is a vertical sectional view which shows the reciprocating piston pump which concerns on embodiment of this invention. It is a vertical sectional view which shows the piston packing in FIG. It is a front view of the piston packing in FIG. 1. It is operation | movement explanatory drawing of the main part at the time of a water absorption process of a reciprocating piston pump. It is operation | movement explanatory drawing of the main part at the time of the discharge process of a reciprocating piston pump.

Hereinafter, a preferred embodiment of the reciprocating piston pump according to the present invention will be described with reference to the accompanying drawings. 1 is a vertical sectional view showing a reciprocating piston pump according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of a piston packing, FIG. 3 is a front view of the piston packing, and FIG. 4 is a reciprocating piston pump. FIG. 5 is an operation explanatory diagram of the main part in the water absorption process, and FIG. 5 is an operation explanatory diagram of the main part in the discharge process of the reciprocating piston.

The reciprocating piston pump of the present embodiment is used for equipment such as a power atomizer, and various liquids are used as the liquid used for the reciprocating piston pump depending on the application. ..

As shown in FIG. 1, the reciprocating piston pump 100 is roughly provided with a crankcase 1, a water absorption side manifold 2, a cylinder pipe (cylinder) 3, and a discharge side manifold 4 connected in this order from the right side to the left side in the drawing. ing. Inside the crank case 1, the crank shaft 5 pivotally supported by the crank case 1, the connecting rod 6 rotatably connected to the crank shaft 5, and the rear end portion of the piston rod 7 rotatably connected to the connecting rod 6 are connected. A piston pin 8 or the like is arranged, and a drive unit 9 for reciprocating the piston rod 7 is configured by the crank shaft 5, the connecting rod 6, the piston pin 8 or the like. The piston rod 7 is reciprocally arranged inside the crankcase 1 to the cylinder pipe 3.

1 and 5 show a state in which the piston rod 7 is located at the top dead center in the discharge process in which the piston rod 7 moves forward in the axial direction due to the rotation of the crank shaft 5, and FIG. 4 shows the piston rod 7 located in the rearward in the axial direction. It shows the state of being located at the bottom dead center in the moving water absorption process.

The crankcase 1 is filled with lubricating oil, and the position where the piston rod 7 passes is slidably contacted with the piston rod 7 to prevent the lubricating oil in the crankcase 1 from leaking to the water absorption side manifold 2. An oil seal 10 for the purpose is arranged. Further, a seal packing 11 is provided in the water absorption side manifold 2 for sliding contact with the piston rod 7 and preventing leakage of the working liquid on the water absorption side manifold 2 side to the oil seal 10 side. The water absorption side manifold 2 is provided with a water absorption port 15 for sucking the working liquid into the inside.

A discharge valve 17 is provided at the tip of the discharge side manifold 4 in front of the cylinder pipe 3 to open and close the flow path and discharge the liquid to be used to the discharge port 16 by opening. The discharge side manifold 4 is provided with a pressure regulating valve 18 for adjusting the pressure of the discharged working liquid, and is provided with an air chamber 19 for cushioning the pulsation of the discharged working liquid.

Further, in the cylinder pipe 3, the piston rod 7 reciprocates in the axial direction together with the piston rod 7, and the liquid used is absorbed from the water suction port 15 toward the discharge valve 17 during the water absorption step in which the piston rod 7 moves rearward in the axial direction. A water absorption valve mechanism 20 is provided that is opened and closed so as to pressurize the liquid used on the discharge valve 17 side during the discharge process in which the piston rod 7 moves forward in the axial direction.

As shown in FIGS. 4 and 5, the water absorption valve mechanism 20 has a water absorption valve 21, a packing 22a slidably in contact with the inner peripheral surface of the cylinder pipe 3, a piston packing 22 having a water absorption valve seat 22b, and a water absorption valve 21. It mainly includes a spring 23 as a pressing means for pressing the seat 22b so as to be seated, and further includes a collar 24, a washer 25, and a hexagon nut 26.

The water absorption valve 21 is a disk having a through hole for passing the collar 24 in the center, and is arranged on the front side in the axial direction from the piston packing 22. The collar 24 is a cylinder provided with a through hole for passing the piston rod 7 in the center, and the outer peripheral surface of the rear end portion in the axial direction is reduced in diameter. A water absorption valve 21 is extrapolated to the reduced diameter portion 29 so as to be movable in the axial direction.

As shown in FIG. 2, the water absorption valve seat 22b constituting the piston packing 22 is configured such that the water absorption valve 21 is seated / seated, and has a through hole in the center for passing the piston rod 7 and has a substantially cylindrical shape. The water absorption valve 21 and the collar 24 are arranged on the rear side in the axial direction (see FIGS. 4 and 5). As shown in FIGS. 2 and 3, the water absorption valve seat 22b is provided with a plurality of through holes 27 communicating in the front-rear direction in the axial direction at equal intervals along the circumferential direction. Here, the through holes 27 are elongated holes forming an arc shape with the axis as the center in the axial direction, and four holes are provided. A concave groove 28 recessed rearward in the axial direction is provided in an annular shape on the front surface of the water absorption valve seat 22b in the axial direction. The front end in the axial direction is arranged.

The packing 22a constituting the piston packing 22 is formed in an annular shape from an elastic body such as rubber, and is pushed into an annular groove provided on the outer periphery of the water absorption valve seat 22b to be accommodated and held.

Then, as shown in FIGS. 4 and 5, from the tip end side of the piston rod 7, the piston packing 22, the collar 24 to which the water absorption valve 21 is externally inserted into the reduced diameter portion 29, and the washer 25 are fitted in this order. A spring 23 is interposed between the water absorption valve 21 and the washer 25, and the hexagon nut 26 is screwed and tightened into the male screw 30 formed at the tip of the piston rod 7 to absorb water from the piston packing 22. The axial rear end surface of the valve seat 22b is abutted against the expanded step portion 31 of the piston rod 7, and these piston packing 22, the collar 24, and the washer 25 are placed between the step portion 31 and the hexagon nut 26. It is pinched and fixed.

In this state, the water absorption valve 21 is pressed by the spring 23 interposed between the water absorption valve 21 and the washer 25, and is seated on the water absorption valve seat 22b during the discharge process shown in FIGS. 1 and 5 to pass through the hole. 27 and the recessed groove 28 are closed.

In such a reciprocating piston pump 100, when the crank shaft 5 is rotationally driven, the piston rod 7 reciprocates in the cylinder pipe 3 and moves from the top dead center to the bottom dead center (see FIG. 4). The discharge process (see FIG. 5) of moving from the dead center to the top dead center is repeated.

Here, when the discharge process is switched to the water absorption process, the piston rod 7 moves rearward in the axial direction, and as shown in FIG. 4, the water absorption valve 21 is separated from the water absorption valve seat 22b against the pressing force of the spring 23. Then, a gap is created between the water absorption valve 21 and the water absorption valve seat 22b (the water absorption valve 21 of the water absorption valve mechanism 20 is opened), the through hole 27 is opened, and the liquid used from the water absorption port 15 is indicated by an arrow. As shown by the flow of, water is absorbed forward in the axial direction of the piston packing 22 through the through hole 27 and the recessed groove 28.

In this way, when the water absorption valve 21 is separated from the water absorption valve seat 22b, the working liquid that comes out from the plurality of through holes 27 of the water absorption valve seat 22b connects the through holes 27 in the circumferential direction. Since the water absorption valve 21 is once gathered in a ring shape by 28 and hits the water absorption valve 21, the water absorption valve 21 can be separated from the seat with a uniform force, and the flow of the working liquid can be smoothed and the working liquid can flow efficiently. (Water absorption efficiency can be improved). Further, since the water absorption valve 21 can be separated from the seat with a uniform force in this way, it is possible to prevent the water absorption valve 21 from tilting.

Further, since the through hole 27 is an elongated hole having an arc shape in the axial direction, the above-mentioned action / effect can be further enhanced as compared with the circular hole.

On the other hand, when the water absorption process is shifted to the discharge process, the piston rod 7 moves forward in the axial direction, and as shown in FIG. 5, the water absorption valve 21 is seated on the water absorption valve seat 22b by the pressing force of the spring 23, and the water absorption valve 21 The through hole 27 and the recessed groove 28 are closed (the water absorption valve 21 of the water absorption valve mechanism 20 is closed), and the through hole 27 is closed.

At this time, since the liquid used stays in the recessed groove 28 connecting the front end of the through hole 27 of the water absorption valve seat 22b in the circumferential direction, it can serve as a cushion and alleviate the impact.

Further, the recessed groove 28 provided on the front surface of the water absorption valve seat 22b prevents the water absorption valve 21 from cutting the water film when seated on the water absorption valve seat 22b (surface contact is reduced). .. Therefore, the vacuum phenomenon between the water absorption valve 21 and the water absorption valve seat 22b is alleviated, and the sticking phenomenon of the water absorption valve 21 to the water absorption valve seat 22b is suppressed.

Further, in synchronization with the movement of the piston rod 7 forward in the axial direction, the packing 22a moves forward while sliding in contact with the inner peripheral surface of the cylinder pipe 3, so that water pressure is generated, and the water absorption valve 21 absorbs water with a stronger pressing force. It is pressed against the valve seat 22b, the sealing property is enhanced, and the flow of the working liquid is surely blocked.

Then, the liquid used in front of the piston packing 22 is moved forward in the axial direction of the piston packing 22 to open the discharge valve 17 and is discharged to the outside from the discharge port 16 as shown by the flow of the arrow.

After that, the discharge process is switched to the water absorption process, the piston rod 7 moves rearward in the axial direction, and as shown in FIG. 4, the water absorption valve 21 separates from the water absorption valve seat 22b, but as described above, it is recessed. Since the groove 28 suppresses the phenomenon of the water absorption valve 21 sticking to the water absorption valve seat 22b, it is possible to prevent the occurrence of pulsation when the water absorption valve 21 leaves the water absorption valve seat 22b and to reduce noise. be able to.

The main actions / effects of the present embodiment have been described above, but according to the present embodiment, the following actions / effects are also exhibited.

That is, since the flow of the working liquid flows in one direction, the water absorption efficiency is high and the energy saving of the reciprocating piston pump itself can be achieved. Further, since the flow of the working liquid can be brought close to a straight line, the flow of the working liquid becomes smooth and the water absorption efficiency can be further improved.

Further, since the piston packing 22 moves in synchronization with the movement of the piston rod 7, pulsation can be prevented and stable performance can be exhibited.

Further, since the movable water absorption valve 21 opens and closes the water absorption valve 21 by taking off / seating with respect to the fixed water absorption valve seat 22b, and the weight of the water absorption valve 21 is smaller than that of the water absorption valve seat 22b. The impact force when opening and closing the water absorption valve 21 can be reduced, and noise can be reduced. Further, by forming the water absorption valve 21 from the resin, a large low noise effect can be obtained.

Further, since the water absorption valve 21 is forcibly opened and closed according to the movement of the piston rod 7, the water absorption valve 21 can be opened and closed reliably with little loss.

Further, unlike the forced valve type piston pump described in Japanese Patent Application Laid-Open No. 2014-224469, the water absorption valve does not have a configuration in which the water absorption valve comes into contact with the stopper and the water absorption valve seat, respectively, when the water absorption valve is opened and closed. Since the number of contacts is once when the water absorption valve seat 22b is seated, noise reduction can be achieved.

Although the present invention has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the packing 22a is particularly preferable as rubber. Any elastic body may be used.

Further, although the water absorption valve 21 is pressed by the spring 23 to be seated on the water absorption valve seat 22b, a pressing means other than the spring 23 may be used.

Further, in the above embodiment, an example in which the reciprocating piston pump 100 is applied to the power atomizer is described as particularly preferable, but the fine mist cooling or the fine mist cooling in which the cavitation generation due to fresh water and the noise due to the striking sound are anxious. The same can be applied to other reciprocating piston pumps such as reciprocating piston pumps for mist.

3 ... Cylinder pipe (cylinder), 7 ... Piston rod, 21 ... Water absorption valve, 22 ... Piston packing, 22a ... Packing, 22b ... Water absorption valve seat, 23 ... Spring (pressing means), 27 ... Through hole, 28 ... Concave Groove, 100 ... Reciprocating piston pump.

Claims (2)

The piston rod (7), whose rear end side in the axial direction is connected to the drive unit (9) and reciprocates in the cylinder (3),
A water absorption valve seat (22b) and a water absorption valve seat (22b) having a cylindrical shape, fitted to the piston rod (7), fixed, and having a plurality of through holes (27) communicating in the front-rear direction in the axial direction along the circumferential direction. A piston packing (22) provided with a packing (22a) made of an elastic body held in an annular shape on the outer peripheral side of the cylinder (3) and slidably in contact with the inner peripheral surface of the cylinder (3).
It has a cylindrical shape and is extrapolated to the piston rod (7) so as to be movable in the axial direction. A water absorption valve (21) that opens and closes the through hole (27) by
A reciprocating piston pump (100) comprising a pressing means (23) for pressing the water absorption valve (21) so as to be seated on the water absorption valve seat (22b).
The through holes (27) of the water absorption valve seat (22b) are spaced apart at equal intervals along the circumferential direction.
On the front surface of the water absorption valve seat (22b) in the axial direction, a concave groove (28) recessed rearward in the axial direction is provided in an annular shape so as to connect the plurality of through holes (27). A featured reciprocating piston pump (100). The reciprocating piston pump (100) according to claim 1, wherein the through hole (27) is an elongated hole having an arc shape in an axial direction.

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