JPS6332478Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention adjusts the amplitude of fluid pulsation in a reciprocating pump attached to a power device, such as a power sprayer, and maintains the fluid pressure adjustment constant. Regarding the possible pulsation absorbing device for a reciprocating pump, in detail, it smoothes the pulsation of the fluid without adding an air chamber to the power equipment, maintains the pressure constant, and when the pressure rises abnormally, it can be applied to the low pressure side. The present invention relates to a pulsation absorbing device for a reciprocating pump that discharges fluid and prevents damage to pumps, hoses, etc., and that has a simple structure and can be downsized.

[Conventional technology]

(i) Conventionally, for example, in a power spray machine equipped with a reciprocating pump, which has been widely used, an air chamber is attached to the outside of the discharge valve to smooth out pulsations when the fluid discharged from the pump flows. By adjusting and maintaining the pressure of the fluid discharged from the pump at a predetermined value using a pressure regulating valve set separately from the air chamber, damage to equipment including the power sprayer is prevented.

(ii) Also, as a means for absorbing the pulsation, for example, a hydraulic path is connected to a cylinder equipped with a plunger,
A device has been proposed in which a cylinder type device containing a piston and a spring is connected to this hydraulic path. (See Utility Model Publication No. 56-93501 for an example.) [Problem to be solved by the invention] In the type (i) of the conventional technology mentioned above, incidental members such as air chambers, pressure regulating valves, etc. Since a large number of pumps are required, the configuration of the pump as a whole is forced to be complicated and diverse, which increases the risk of malfunctions.Furthermore, the cost of facilities soars and the size of the pump becomes larger. It's hard to avoid the fact that it doesn't exist. Furthermore, the type (ii) has the problem that it is not possible to adjust the pulsations occurring in the hydraulic path communicating with the cylinder.

This idea was created with an eye on the problems mentioned above, and its purpose was to smooth out pulsations without adding an air chamber, which was considered essential in the past, and to prevent abnormal pressure rises. The present invention aims to provide a pump pulsation absorbing device that can prevent damage to valves, hoses, etc. by discharging the fluid to the low pressure side.

[Means to solve the problem]

This invention is a pump pulsation absorbing device consisting of a valve seat and a valve with a pressure-sensitive member attached to one end. It is fixed to the inner peripheral edge of the hollow part formed between the discharge port and the valve seat, and the front edge of the cylinder is brought into contact with the rear edge of the valve seat via the spacing piece and the packing. The valve, which is fitted into the inner circumferential edge of the base frame and is seated on the valve seat, is integrally formed with a contact portion at the front end and a bulge at the rear end, and on the side of the bulge, a piston fitting that slides into contact with the inner circumferential edge of the cylinder; a clamping body having a substantially U-shaped cross section into which the piston fitting is fitted;
A U-shaped cross section is screwed into the inner circumferential edge of the clamping body so as to be movable and retractable, is inserted through the valve, and has an adjustable space between the front end inner wall and the front edge of the bulge. A pressure sensitive member consisting of an inductor, a coil spring stretched between the rear end of the bulge and the inner wall of the rear end of the clamping body, and resiliently biasing the valve toward the valve seat, is free. An adjustment screw that can move forward and backward is screwed into the rear end of the lid body that is fitted and screwed to the rear of the base frame, and a spring that comes into contact with the front end of the adjustment screw and is fitted inside the rear of the lid body. A coil spring is stretched between the seat and the rear end of the clamping body of the pressure-sensitive member, and the coil spring always springs and biases the pressure-sensitive member toward the spacing member. The front end of the pressing rod, whose rear end is fitted into a recess formed in the front end of the abutment part of the valve, is attached to a rotating shaft that is rotatably passed through and stands upright on a holding piece fixed to the front of the base frame. It is designed to come into contact with the outer periphery of a fixed cam, and has the functions of an air chamber and a safety valve, and also allows for miniaturization.

〔Example〕

This invention will be explained below using examples with reference to the drawings. A base frame provided with a suction port 1 that communicates with a high-pressure pipe line of a cleaning device (none of which is shown) that can discharge liquid in a storage tank from a cleaning nozzle with an opening/closing knob via a reciprocating pump driven by a prime mover. 2 (the left side is the front and the right side is the rear in Figure 1). The cylinder 4, whose rear end abuts the front end of the lid 3, is fitted into the inner peripheral edge of the base frame 2, while the exhaust port 15 bored in front of the inlet 1 and the inlet A valve seat b having a substantially T-shaped cross section is fixed to the inner peripheral edge of a hollow portion h formed between the valve seat b and the valve seat b, and
The front edge of the cylinder 4 is brought into contact with the front edge of the cylinder 4 via the spacing piece d and the gasket P, and the valve 10 seated on the valve seat b has an abutment part C at the front end and a bulging part e at the rear end. The bulging portion e is loosely fitted to the inner circumferential edge of a guide member 7 in a pressure sensitive member S, which will be described later, so that it can be hooked and taken along. Further, the piston packing 5 that slides on the inner peripheral edge of the cylinder 4 is fitted into a recess of a clamping body 6 having a substantially U-shaped cross section, and a female thread carved in the inner peripheral edge of this clamping body 6 has a cross section is screwed into the U-shaped inductor 7 through a male thread carved on its outer periphery so that it can move forward and backward, and the bulge e of the valve 10 is fitted into the inner periphery of this inductor 7. An adjustable space i is formed between the bulge e and the inside of the front end of the inductor 7, and the intermediate part of the valve 10 is movably penetrated into the front end of the inductor 7, and the rear edge of the bulge e. A coil spring n is stretched in a space a between the inner wall of the rear end of the clamping body 6, and the valve 10 is always urged and biased toward the valve seat b. The member consisting of the piston packing 5, the clamping body 6, the induction body 7, and the coil spring n is referred to as a pressure-sensitive member S. An adjustment screw 8 is screwed into the wall W at the rear end of the lid 3 so as to be movable back and forth, and a spring seat 9 is abutted against the front end of the adjustment screw 8 and is fitted into the rear inside of the lid 3.
A coil spring f is stretched between the pressure-sensitive member S and the rear end of the clamping body 6, and the coil spring f constantly springs and biases the pressure-sensitive member S toward the spacing member d. At the same time, the press rod 11 is inserted into the recess j formed at the front end of the abutting portion C of the valve 10.
The rear end of the press rod 11 is inserted into the center of the support 12 fixed to the front inner peripheral edge of the base frame 2. The front end of the cam 13 can be contacted with the outer peripheral edge g of the cam 13 fixed to the rotation shaft 14, and the rotation shaft 14 can be freely rotated on the holding piece 17 screwed onto the front of the base frame 2. A handle or a connecting rod (both not shown) is attached to the upper threaded part K, and when the pressure of the fluid flowing in from the suction port 1 rises abnormally, the rotating shaft 14 is automatically or manually inserted. can be rotated in the direction of the arrow y.
In addition, a delivery pipe 16 such as a hose is connected to the discharge port 15.
It is possible to connect and transport the liquid to the desired location. Note that the area behind the contact part C of the valve 10 is referred to as the high pressure side, and the area in front of it is referred to as the low pressure side. A pressure-sensitive member S, a valve 10, a pressing rod 11, and a cam 13 are arranged on an axis XX in the longitudinal direction of the housing V.

In the figure, r is a "0" ring and t is a seal.

[Effect]

Since this device has the above-mentioned configuration, for example, when the opening/closing knob of the cleaning nozzle is opened and a certain amount of liquid is ejected from the cleaning nozzle using a reciprocating pump, the air flow from the suction port 1 of the device to the hollow portion h Suppose that liquid flows into the chamber at an operating pressure P _N. Now, the spring constant of the spring f is K, the free length is L ₀ , the length inside the casing V is lb, the amount of contraction due to the forward movement of the adjustment screw 8 is α, and the amount of play of the pressure sensitive member S ( Blank space i
(distance along the longitudinal direction in Ps (For convenience, this pressure is referred to as instantaneous pressure.) The pressure when the front edge of the bulging part e of the valve 10 contacts the inner wall of the front end of the inductor 7 (l≒0) is P′, and the pressure of the pressure sensitive member S is P′. The pressure when the clamping body 6 contacts the spacing piece d is Pd, and the pressure amplitude during pulsation is △
P, and if the pressing force of the coil spring f is Fs, then
The following relationships hold between the respective pressures and pressing forces.

For the instantaneous pressure Ps, (A-Av)Ps>Fs = K (L ₀ -lb)≒Kl+Kα...(1) For the pressure P', AP'=Fs...(2) Equations (1), (2) From Ps＞P′ For pressure Pd, APd=(P′−△P)=Fs−Kl =K(L ₀ −lb)+Kα =K(L ₀ −lb+α) ……(3) From the above, pressure and The relationship with the displacement of the coil spring f is illustrated in FIG. 3.

The pulsation absorber according to this invention has a working pressure P _N
is particularly effective when the pressure is greater than or equal to the pressure Pd and less than the pressure P'.When the operating pressure P _N of the liquid currently ejected from the cleaning nozzle is set in the range of Pd≦P _N <Pd+△P, this operating pressure P _N can be determined by the shape of the cleaning nozzle and the amount of liquid fed by the metering pump. In addition, the pressure amplitude △P becomes △P=P'-Pd=Kl/A from Fig. 3, and the absorbable pressure amplitude △P is proportional to the amount of play l, so this amount of play l can be changed. By screwing the derivative 7 to the clamping body 6 so that it can move forward and backward,
The pressure amplitude ΔP can be selected in advance. For example, when the amount of play is l ₁ , the relationship between the displacement of the pressure-sensitive member S and the pressure amplitude (for convenience, △P ₁ ) is shown by a broken line in Fig. 3, and △P ₁ = K/A- l becomes ₁ .

In FIG. 1, the adjustment screw 8 is set at a desired position with respect to the wall W at the rear end of the lid 3, and the elastic force of the coil spring f is set to a specified value via the spring seat 9. For example, the pressure member S is pressed and held at the position shown by the solid line in FIG. and closes the passage to the low-pressure side, so the pressure-sensitive member S is pushed backward via the inductor 7 against the elastic force of the coil spring f, and moves to a position balanced with the elastic force of the coil spring f. Therefore, the hollow portion h formed between the contact portion C and the guide member 7 is automatically expanded, and the pulsation of the fluid is made uniform.

Further, when the fluid pressure increases abnormally and exceeds the pressure Ps, the pressure sensitive member S presses the coil spring f further than in the above case and moves backward, so that the front end of the induction body 7 of the pressure sensitive member S Since the wall touches the stationary bulge e and presses it backward,
The stationary valve 10 is forcibly pulled backwards.
Because of this, the contact part C separates from the valve seat b, and the fluid under high pressure in the hollow part h flows to the low pressure side via the valve seat b, and flows out from the discharge port 15 while the pressure decreases. This automatically lowers the pressure of the fluid under high pressure that has flowed into the hollow portion h. Therefore, it is easy to understand that it has the functions of both a conventional air chamber and a safety valve.

〔effect〕

According to this invention, the cavity in the pressure sensitive member can be adjusted along the valve sliding direction, so when the amount of displacement is less than the amount of play, as described above, the fluid flows into the hollow part through the suction port. It is capable of smoothing and absorbing pulsations during the flow of water, and has the same function as the air chamber, which was traditionally considered essential for reciprocating pumps driven by a prime mover. When the pressure exceeds the amount of pressure, the pressure-sensitive member and the valve are integrally connected via the bulge at the rear end of the valve, press the coil spring in the pressure-sensitive member, and move to the rear of the base frame. By removing the valve from the valve seat, the high-pressure fluid in the hollow part flows out to the discharge port, and it functions as a safety valve against unexpected pressure increases. It is possible to omit the conduit associated with this, which solves the problem of complicating the configuration and increasing the size, making it possible to simplify the configuration and downsize the form, and it is determined by the specifications of the reciprocating pump. Depending on the pressure amplitude to be applied, the length of the cavity is
Since the screwing position of the derivative with respect to the holding body can be adjusted by setting the appropriate setting, it is possible to effectively absorb pulsation that is suitable for the usage conditions of the reciprocating pump, and the user can use it with peace of mind. The rotation of the cam fixed to the shaft contributes to reducing the load on the prime mover at the beginning of operation when the reciprocating pump starts operating.
When there is an abnormal pressure rise in the fluid flowing into the hollow part, the rotation axis is set on the low pressure side in front of the base frame to resolve the abnormal pressure rise by pressing the pressure rod backward to open the valve. Because of this, it can be easily rotated without facing much resistance to rotation.
Moreover, there is no risk of damaging various components. Furthermore, if the valve, which is inserted through the pressure-sensitive member by the coil spring of the pressure-sensitive member, is always seated on the valve seat fixed in front of the base frame, there is a risk that the valve may unexpectedly detach from the valve seat. In addition, the coil spring tensioned between the spring seat on the inside rear of the lid and the rear end of the clamping body is moved forward and backward by an adjustment screw screwed into the rear end of the lid that is screwed to the rear of the base frame. By adjusting the tension, it is possible to easily adjust the pressing force of the pressure-sensitive member on one side of the spacer and set the opening pressure of the high-pressure fluid as a safety valve.

In addition, when setting the pressure of this device, please note that the operating pressure
When P _N is between pressures Pd and P' (see Figure 3)
As described above, when the pressure is above P' or when the amount of play l=0, it has the function of a pressure regulating valve attached to a conventional reciprocating pump.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a longitudinal sectional front view, Fig. 2 is a side view of the support, and Fig. 3 shows the relationship between the coil spring and valve inside the lid, and the pressure applied to the pressure-sensitive member. This is a diagram showing the relationship. 1... Suction port, 2... Base frame, 3... Lid, 4...
...Cylinder, 5...Piston seal, 6...
Clamping body, 7... Inductor, 8... Adjustment screw, 9...
Spring seat, 10...Valve, 11...Press rod, 13...
Cam, 14... Rotating shaft, 15... Discharge port, 17...
...Holding piece, P...Packing, S...Pressure sensitive member, i
...Vacancy, b...Valve seat, d...Space retaining piece, f,
n...Coil spring, g...Outer edge of cam,
h...Hollow part, j...Concavity.

Claims (1)

[Scope of utility model registration request] In a pump pulsation absorbing device composed of a valve seat and a valve having a pressure-sensitive member attached to one end, the valve seat b has a suction port 1 provided in the base frame 2 and a valve located in front of the suction port 1. It is fixed to the inner peripheral edge of the hollow part h formed between the disposed discharge port 15 and the front edge of the cylinder 4 is brought into contact with the rear edge of the valve seat b via the spacing piece d and the packing P. and fit the cylinder 4 to the inner peripheral edge of the base frame 2, while the valve seat b
The valve 10 is integrally formed with a contact portion C at the front end and a bulge e at the rear end, and has a piston packing 5 on the side of the bulge e that slides into contact with the inner peripheral edge of the cylinder 4. , a clamping body 6 having a substantially U-shaped cross section into which the piston packing 5 is fitted, and a clamping body 6 that is screwed into the inner circumferential edge of the clamping body 6 so as to be movable back and forth, and is inserted through the valve 10, and is connected to the inner wall of the front end and the bulge. A guide body 7 having a U-shaped cross section with an adjustable space i formed between the front edge of the portion e and a rear end of the bulging portion e and the inner wall of the rear end of the clamping body 6. is provided, and the valve 10 is placed on the valve seat b.
A pressure-sensitive member S consisting of a coil spring n that springs and urges the side is loosely fitted, and an adjustment screw 8 that can move forward and backward is screwed into the rear end of the lid 3 that is screwed to the rear of the base frame 2. A coil spring f is stretched between a spring seat 9 that is in contact with the front end of the adjustment screw 8 and fitted into the rear inside of the lid 3 and the rear end of the clamping body 6 of the pressure sensitive member S. The coil spring f always springs and biases the pressure sensitive member S toward the spacer holding piece d, and the pressure sensitive member S is pushed into the recess j formed at the front end of the abutting portion C of the valve 10. The front end of the pressing rod 11 whose rear end is inserted comes into contact with the outer circumferential edge g of the cam 13 fixed to a rotating shaft 14 that rotatably penetrates and stands upright through a holding piece 17 fixed in front of the base frame 2. A pulsation absorbing device for a reciprocating pump.