JPH0747949B2 - Pump pressure vibration damping device and pump device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump pressure vibration damping device for damping pressure vibration such as pulsating pressure of a pump and a pump device including the same, and more particularly, to a compact pump and pump. The present invention relates to a possible pressure vibration damping device for a pump and a pump device including the same.

[Conventional technology]

In a conventional pressure vibration damping device (eg, Japanese Utility Model Laid-Open No. 63-96287) that buffers pressure vibration such as pulsating discharge pressure of the pump, air is enclosed in the housing and the lower connection port of the housing is discharged from the pump. The discharge liquid of the pump is introduced to the lower part of the housing by connecting to the outlet, and the vibration of the discharge pressure of the pump is absorbed by the elastic volume change of the enclosed air in the housing. Since this pressure vibration damping device is manufactured separately from the pump and is connected to the pump, there is a drawback in that the overall size is large.

Therefore, in JP-A-55-66675, a lid is joined to a pump casing serving as an outer wall of a pump, and recesses are formed in the pump casing and the lid so as to face each other, and each of them is a liquid. It is used as a pressure chamber and an air chamber.
Since this pressure vibration damping device is integrated with the pump, there is an advantage that the entire pump device is very compact. Further, in the pump device disclosed in JP-A-55-66675, a pressure control valve such as an unload valve is provided separately from the hydraulic chamber as a recess on the outer surface of the pump casing, and is connected to the pump discharge portion. It is connected.

[Problems to be Solved by the Invention]

In the pump device of JP-A-55-66675, the pressure vibration damping device is integrated with the pump, but the pressure control valve such as the unload valve is arranged separately from the pressure vibration damping device and the pump. Since it is connected to the pump, the overall size is still large and the piping is complicated.

An object of the invention of claim 1 is to overcome the above-mentioned problems and to provide a pressure vibration damping device integrated with a pump and a pressure control valve.

An object of the invention of claim 2 is to reduce the height of the entire pump device including the pressure vibration damping device of claim 1.

[Means for Solving the Problems]

The present invention will be described using the reference numerals of the drawings corresponding to the embodiments.

The pressure vibration damping device for a pump according to claim 1 has the following (a)-
It has the component (e).

(A) Pump casing (16) as outer wall of pump (12) (b) Pressure control valve (1) for controlling discharge pressure of pump (12)
A body (40) which is an element of 4) and is joined to the pump casing (16) (c) A gas chamber (which is formed as a recess at the joint of the pump casing (16) with this body (40) and which is filled with gas ( 70) (d) A pressure adjusting chamber (50) for the discharge part (38) in the pump casing (16) and the pressure control valve (14), which is formed as a recess in the joint part of the body (40) with the pump casing (16). A diaphragm (74) for partitioning between the hydraulic chamber (72) (e) communicating with the (e) gas chamber (70) and the hydraulic chamber (72). The pump device according to claim 2 is the pressure vibration for pump according to claim 1. Includes shock absorber. The pressure control valve (14) is connected to the pump (12) so as to be flat in a direction parallel to the joint surface between the pump casing (16) and the body (40).

[Action]

In the invention of claim 1, the liquid discharged from the pump (12) is
It enters into the pressure control valve (14) from the discharge part (38) of the pump (12), and the pressure control chamber (50) and the hydraulic chamber (72) of the pressure control valve (14).
Be led to. The hydraulic pressure in the hydraulic chamber (72) vibrates along with the pressure vibration in the discharge part (38), and the pump casing (16)
The enclosed gas in the gas chamber (70) of the
The volume is elastically changed by receiving the pressure vibration of the hydraulic chamber (72) via 4). As a result, the volume of the hydraulic chamber (72) changes according to the pressure vibration of the discharge part (38) of the pump (12).
Increase and decrease, and the pressure oscillation of the discharge pressure of the pump (12) is buffered.

〔Example〕

 Hereinafter, the present invention will be described with reference to the embodiments of the drawings.

1 and 2 are vertical sectional views of the pump device 10 as seen from the front side and the right side, respectively, and FIGS. 5 and 6 are a front view and a left side view of the pump device 10, respectively.
Mainly in FIGS. 1 and 2, the pump device 10 includes a lower double-acting pump 12 and an unload valve 14 coupled to the upper side of the double-acting pump 12. The double-acting pump 12 has a pump casing 16 as an outer wall, a drive shaft 18 extends horizontally in the center of the pump casing 16, and an eccentric cam 20 is integrally and rotatably attached to an end portion of the drive shaft 18 for driving. It rotates with the rotation of the shaft 18. The piston bodies 22 are respectively arranged on both sides of the eccentric cam 20 in the horizontal direction perpendicular to the axial direction of the drive shaft 18, partition the pump chamber 24 on the tip end side, and slidably contact the seal 26 on the base end side. There is. The connecting member 27 is coupled to the base end portions of both piston bodies 22 on both sides, is fitted to the eccentric cam 20, and is reciprocally displaced in the axial direction of the piston body 22 as the eccentric cam 20 rotates, Both piston bodies
Move 22 back and forth. The suction passage 28 and the discharge-side communication passage 30 are formed in the lower and upper portions of the pump casing 16 in parallel with the reciprocating direction of the piston body 22, and the suction port 32 is the suction passage.
Connect to the center of 28. The suction valves 34 are respectively arranged at both ends of the suction passage 28, and allow a one-way flow of liquid from the suction passage 28 to the pump chamber 24. The discharge valves 36 are respectively arranged at both ends of the discharge side communication passage 30, and allow a one-way liquid flow from the pump chamber 24 to the discharge side communication passage 30. Discharge passage 38
Rises from one end of the discharge-side communication passage 30 upward. The body 40 of the unload valve 14 is the pump casing.
It is joined to the upper surface of 16 and the pump casing by bolt 45
Fastened to 16. The input passage 42 is formed in the body 40 and is connected at its lower end to the discharge passage 38 of the pump casing 16. The O-ring 44 is fitted in the annular groove of the connecting portion between the discharge passage 38 and the input passage 42 and prevents liquid leakage from the connecting portion.

The operation of the piston body 22 will be described. As the drive shaft 18 rotates, the eccentric cam 20 rotates and the piston body 22 reciprocates to increase or decrease the volume of the pump chamber 24. Since the left and right piston bodies 22 are alternately pressed toward the pump chamber 24 by the eccentric cam 20, the suction stroke and the discharge stroke of the left and right pump chambers 24 are opposite to each other. In this way, the liquid flows to the left and right pump chambers.
24 through discharge valve 36 discharge side communication passage 30 and discharge passage 38
Are alternately discharged.

FIG. 3 is a horizontal sectional view of the unload valve 14. The unload valve 14 includes a discharge port 46 to which an end of a hose connected to a gun nozzle (not shown) is attached, and a return port 48 to which an end of a hose that returns excess liquid to the tank is attached. The pressure adjusting chamber 50 is formed in the center of the body 40, and guides the liquid from the discharge passage 38 of the double-acting pump 12 via the input passage 42. valve seat
52 is disposed on the return port 48 side of the pressure adjusting chamber 50, and the ball 54
Is disposed in the pressure adjusting chamber 50 and is freely seated on the valve seat 52. The valve rod 56 projects into the pressure adjusting chamber 50 and holds the ball 54 at one end. The check valve 58 has a pressure adjusting chamber 50 and a discharge port.
It is arranged between the pressure adjusting chamber 50 and the discharge port 46 and allows the liquid to flow in one direction from the pressure adjusting chamber 50 to the discharge port 46. The communication passage 60 communicates the discharge port 46 side of the check valve 58 with the ball 54 side of the piston part 62 of the valve rod 56, and applies the hydraulic pressure of the discharge port 46 side of the check valve 58 to the piston part 62. The handle 66 penetrates the pressure adjusting screw 64 and
It is in contact with 62. The compression coil spring 68 is fitted on the handle 66, and is compressed between the pressure adjusting screw 64 and the flange portion of the handle 66, and the valve rod 56 is moved toward the ball 54 through the flange portion of the handle 66. I am biased. The preload of the compression coil spring 68 is adjusted by adjusting the screwing amount of the pressure adjusting screw 64.

In the unload valve 14, the input passage 42 in the body 40
Etc., discharge port 46 and return port 48, and handle 66
Etc. are set so as to be in the same plane, and as a result, the unload valve 14 has a flat shape. And
The unloading valve 14 is coupled to the upper part of the double-acting pump 12 so that the thickness direction thereof is the height direction of the pump device 10, and thus the overall height of the pump device 10 is significantly reduced. .

The operation of the unload valve 14 will be described. When the gun nozzle connected to the discharge port 46 is in the open state,
The hydraulic pressure at 46 is sufficiently low that the check valve 58 is open. As a result, the liquid pressure-fed from the discharge passage 38 of the double-acting pump 12 to the pressure regulating chamber 50 via the input passage 42 is supplied from the pressure regulating chamber 50 to the gun nozzle via the check valve 58 and the discharge port 46, and the gun nozzle More spouted. On the other hand, when the gun nozzle is closed, the hydraulic pressure of the discharge port 46 rises, the check valve 58 is closed, and the pressure regulating chamber 50 and the discharge port 46 are disconnected. Further, the high pressure on the side of the discharge port 46 is transmitted to the piston portion 62 via the communication passage 60, and the valve rod 56 resists the compression coil spring 68 to handle.
The ball 54 moves away from the valve rod 56 toward the 66 side. As a result, the liquid that is pressure-fed from the double-acting pump 12 to the pressure adjusting chamber 50 via the discharge passage 38 and the input passage 42 is returned from the pressure adjusting chamber 50 to the return port.
After being returned to a predetermined tank via 48, the load of the double-acting pump 12 becomes almost zero. When the handle 66 is pulled outward against the compression coil spring 68, the valve rod 56 moves to the handle 66 side, the ball 54 separates from the valve seat 52, and the liquid in the pressure adjusting chamber 50 is guided to the return port 48. The double-acting pump 12 is forcibly placed in the unload state.

Returning to FIG. 1 and FIG. 2, at the joint surface between the pump casing 16 of the double-acting pump 12 and the body 40 of the unload valve 14, a pressurized air chamber 70 and a hydraulic chamber 72 are provided so as to face each other.
Are formed as bowl-shaped recesses and are separated from each other by a diaphragm 74. The air charging port 76 (FIG. 2) is provided on the side surface of the pump casing 16 and communicates with the pressurized air chamber 70. The pressurized air is supplied to the pressurized air chamber 70 through the air sealing port 76 and is sealed therein. The mixer 78 is
It is connected to the discharge port 46 and is used when mixing different kinds of liquid with the liquid discharged from the pressure regulating chamber 50 of the unload valve 14.

FIG. 4 is a vertical sectional view of the body 40 in the vicinity of the hydraulic chamber 72. The pressure regulation chamber 50 is located above the hydraulic pressure chamber 72, and
Communicates with the pressure regulation chamber 50 via a plurality of communication passages 80.

The operation of the pressurized air chamber 70 and the hydraulic chamber 72 will be described.

In the double-acting pump 12, the discharge of the liquid from each pump chamber 24 is intermittent, so the discharge pressure in the discharge passage 38 pulsates. This pulsating hydraulic pressure is applied to the input passage 42, the pressure adjusting chamber 50 and the communication passage.
The hydraulic pressure in the hydraulic chamber 72 is transmitted to the hydraulic chamber 72 via 80.
It vibrates with the hydraulic pressure vibration in the discharge passage 38 and the pressure adjusting chamber 50. The enclosed pressurized air in the pressurized air chamber 70 receives the pressure vibration of the hydraulic chamber 72 via the diaphragm 74 and elastically changes its volume. As a result, the volume of the hydraulic chamber 72 increases or decreases according to the vibration of the discharge pressure of the double-acting pump 12, and the pressure vibration of the pressure adjusting chamber 50 is buffered.

In the illustrated embodiment, the unload valve 14 is integrated with the double-acting pump 12, but instead of the unload valve 14, another pressure control valve such as a pressure regulating valve is integrated with the double-acting pump 12, It is also possible to provide the hydraulic chamber 72 in the body of the pressure control valve.

〔The invention's effect〕

In the invention of claim 1, the pressure control valve such as the unload valve is
The body is joined to the pump casing as the outer wall of the pump to be integrated with the pump, and the pressure vibration damper is a confronting concave formed at the joint between the pump casing of the pump and the body of the pressure control valve. It has a gas chamber and a hydraulic chamber. Therefore, the space of the pressure vibration damping device is reduced, and the pressure vibration damping device for the pump can be downsized.

According to the invention of claim 2, in the pump device in which the pressure control valve is integrated with the pump, and the pressure vibration damping device is provided by utilizing the recess of the joint portion between the pump and the pressure control valve, , Are arranged so as to be flat in the direction parallel to the joint surface of the joint portion with the pump. Therefore, the height of the pump device can be significantly reduced.

[Brief description of drawings]

The drawings relate to an embodiment of the present invention, and FIGS. 1 and 2 are vertical cross-sectional views of the pump device as viewed from the front side and the right side, respectively. FIG. 3 is a horizontal cross-sectional view of the unload valve, and FIG. Vertical sectional views of the body in the vicinity of the hydraulic chamber, FIG. 5 and FIG. 6 are a front view and a left side view of the pump device, respectively. 10 …… Pump device, 12 …… Double-acting pump (pump), 14…
… Unload valve (pressure control valve), 16 …… Pump casing, 38 …… Discharge passage (Discharge part), 40 …… Body, 50 ……
Pressure control chamber, 70 ... Pressurized air chamber (gas chamber), 72 ... Liquid pressure chamber,
74 ... diaphragm.

Claims (2)

[Claims] 1. A pump casing (16) as an outer wall of a pump (12) and a pressure control valve (14) for controlling a discharge pressure of the pump (12), which is an element of the pump casing (1).
A body (40) joined to the body (6), a gas chamber (70) formed as a recess at a joint portion of the pump casing (16) with the body (40) for containing gas, and the pump casing (16). ) Is formed as a recess at the joint part of the body (40) with the discharge part (3) in the pump casing (16).
8) and a fluid pressure chamber (72) communicating with the pressure regulation chamber (50) of the pressure control valve (14), the gas chamber (70) and the fluid pressure chamber (7).
A pressure vibration damping device for a pump, characterized in that it has a diaphragm (74) for partitioning it from 2). 2. A pressure vibration damping device for a pump comprises a pump (1
A pump casing (16) as an outer wall of 2), a body (40) which is an element of a pressure control valve (14) for controlling the discharge pressure of the pump (12) and which is joined to the pump casing (16), A joint between the body (40) of the pump casing (16) and a gas chamber (70) formed as a recess in the joint of the pump casing (16) with the body (40) and filled with gas. And a gas chamber (70), which is formed as a recess in the pump casing (16) and communicates with the discharge part (38) in the pump casing (16) and the pressure control chamber (50) of the pressure control valve (14). ) And a diaphragm (74) for partitioning between the hydraulic chamber (72) and the pressure control valve (14) with respect to the joint surface between the pump casing (16) and the body (40). Characterized by being connected to the pump (12) so as to be flat in a parallel direction. Pump device.