JP4944862B2 - Differential pressure regulator - Google Patents

Description

  The present invention relates to a differential pressure control valve.

  2. Description of the Related Art Conventionally, a differential pressure regulating valve described in Patent Document 1 below is known as a pressure regulating valve that adjusts the pressure of an in-use liquid. FIG. 3 shows a basic configuration of a conventional differential pressure regulating valve including the differential pressure regulating valve described in Patent Document 1.

  As shown in FIG. 3, the pressure regulating valve 300 includes a body 50 including a pressure regulating chamber 51 having an inlet 51 a, an outlet 51 b, and a remaining liquid port 51 c, and the remaining liquid port 51 c is a pressure regulating chamber 51. A piston 53 extending in the vertical direction by a cylindrical hole of a cylindrical valve seat 52 fixed to the cylinder and movable in the vertical direction in the figure and having a cylindrical shape is urged downward as indicated by an arrow by an urging means (not shown). Thus, the lower part enters the pressure regulating chamber 51 and is seated on the valve seat 52 from above. The piston 53 constitutes the upper part of the inner wall surface of the pressure regulating chamber 51 and is guided by the piston guide 54 through which the piston 53 is inserted during separation / seating. An O-ring 55 for sealing the space between the piston 53 and the piston guide 54 together with the backup ring 56 is accommodated in an O-ring groove 53 a provided around the outer peripheral surface of the piston 53.

According to such a pressure regulating valve 300, when the hydraulic pressure of the working liquid in the pressure regulating chamber 51 is equal to or lower than the set pressure, the piston 53 is seated on the valve seat 52 by the biasing force of the biasing means, and the remaining liquid port. While the flow path on the 51c side is closed, when the hydraulic pressure of the liquid used exceeds the set pressure, the piston 53 is lifted away from the valve seat 52 to open the flow path on the residual liquid port 51c side. A part of the liquid is returned through the excess liquid port 51c.
Japanese Patent No. 3913055

  Here, in the pressure regulating valve 300, the differential pressure is determined by the seat surface outer diameter D of the valve seat 52 and the piston 53, and the outer diameter of the O-ring 55 between the piston 53 and the piston guide 54. And the projected cross-sectional area ratio. Accordingly, if the pressure regulating valve 300 is a low pressure type that is applied to a low pressure use liquid, the pressure regulating valve 300 can be applied to a high pressure use liquid with the number of parts to be changed as small as possible. It is necessary to use an O-ring and a backup ring having a small outer diameter, a piston having a smaller outer diameter and a piston guide having a smaller inner diameter in the case of the low pressure type in accordance with the change of the O-ring.

  However, although the number of changed parts is reduced as much as possible in this way, there is a demand for cost reduction by further reducing the number of changed parts.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a differential pressure regulating valve capable of adjusting the pressure over a wide range from low pressure to high pressure at a low cost.

  The differential pressure regulating valve (100, 200) according to the present invention includes a pressure regulating chamber (1) for adjusting the pressure of the inflowing working liquid and a remaining liquid for discharging the working liquid in the pressure regulating chamber (1). When a part of the valve seat (2) forming the mouth (1c) enters the pressure regulating chamber (1) and the pressure of the working liquid is lower than the set pressure, the seat is seated on the valve seat (2) and flows When the pressure of the liquid used exceeds the set pressure while the passage is closed, the piston (3) that separates from the valve seat (2) and opens the flow path and the piston (3) are passed through and the piston ( 3) O-rings (6, 16) are provided between the piston (3) and the piston (3) to guide the movement at the time of separation / seating and to seal the space between the piston (3) and the moving piston. In the differential pressure control valve comprising the piston guide (4) provided, either the piston (3) or the piston guide (4) is O A plurality of O-ring grooves (3a, 3b) for accommodating the ring (6, 16) are provided at a plurality of different diameter positions, and an O-ring (6, 16) is provided in any one of these O-ring grooves (3a, 3b). It is characterized by being arranged.

  According to such a differential pressure regulating valve (100, 200), the piston (3), a part of which enters the pressure regulating chamber (1) for adjusting the pressure of the inflowing working liquid, or the piston ( 3) The piston (3) is separated from / seated with respect to the valve seat (2) which is passed and forms a surplus liquid port (1c) for discharging the used liquid in the pressure regulating chamber (1). A plurality of O-ring grooves (3a, 3b) are provided at different diameter positions in any one of the piston guides (4) for guiding the O-rings (6, 6b). 16), when applied to a low-pressure working liquid, a large-diameter O-ring (6) is disposed in the large-diameter O-ring groove (3a), thereby reducing the differential pressure for low pressure. Can be set, and when applied to a high-pressure working fluid, a small-diameter O-ring ( 6) can be set to set the differential pressure for high pressure. Thus, the differential pressure can be set optimally by simply changing the O-rings (6, 16). The pressure valve (100, 200) can be provided at a low cost.

  Here, as a configuration that effectively exhibits the above action, specifically, the piston (3) has a step on its outer peripheral surface, and the piston guide (4) has a step on its inner peripheral surface. The inner peripheral surface faces the outer peripheral surface of the piston (3) with a predetermined fitting tolerance, and the O-ring grooves (3a, 3b) are formed by a step of either the piston (3) or the piston guide (4). The structure provided in a different diameter position is mentioned.

  As described above, according to the present invention, it is possible to provide a differential pressure control valve capable of adjusting pressure over a wide range at a low cost.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a differential pressure control valve according to the invention will be described with reference to the accompanying drawings. In the present specification, terms such as “upper” and “lower” are based on the state shown in the drawings and are for convenience.

  FIG. 1 is a longitudinal sectional view showing a differential pressure control valve according to an embodiment of the present invention, which is a longitudinal sectional view when applied to a low-pressure use liquid, and FIG. 2 is a longitudinal sectional view when applied to a high-pressure use liquid. The differential pressure regulating valve of the present embodiment is used for, for example, a power sprayer or a washing machine that sprays a use liquid such as agricultural chemicals, and is attached to a discharge side of a pump that discharges the use liquid. This is for adjusting the pressure of the working liquid discharged from the pump.

  First, a differential pressure regulating valve 100 of a low pressure type applied to a low pressure use liquid will be described with reference to FIG. In the differential pressure control valve 100, an inlet 1a is formed on one side, and an outlet 1b is formed on a side opposite to the inlet 1a. Between the inlet 1a and the outlet 1b, the inlet 1a is formed. A body 10 having a remaining liquid port 1c formed in the lower part is provided. The inflow port 1a, the outflow port 1b, and the surplus liquid port 1c communicate with each other via a pressure regulating chamber 1 formed in the body 10. For example, the inflow port 1a is a discharge port of a pump, and the outflow port 1b is an injection nozzle. In addition, the excess liquid port 1c is connected to a tank to which a pump is connected via a pipe or the like.

  A valve seat 2 configured in a cylindrical shape and having an axial line in the vertical direction is inserted from the pressure regulating chamber 1 side on the side of the residual liquid outlet 1c of the pressure regulating chamber 1, and an annular O on the outer peripheral surface of the valve seat 2 The O-ring 5 mounted in the ring groove is pressed against the inner peripheral surface of the body 10 facing the O-ring 5 so that the valve seat 2 is mounted in a fluid-tight manner on the body 10 and the cylindrical hole of the valve seat 2 It is set as the structure which forms the upper part of the remaining liquid port 1c continuing below.

  With respect to the valve seat 2, the piston 3 is configured to be seated from above in the pressure regulating chamber 1. The piston 3 is formed in a stepped columnar shape having an axis in the vertical direction and is arranged coaxially with the valve seat 2, and a seat surface 3 s as a lower end surface is seated on a seat surface 2 s as an upper end surface of the valve seat 2. To do.

  The piston 3 has a step on the outer peripheral surface, the upper side is a large outer diameter portion 3x, the lower side is a small outer diameter portion 3y, and an O-ring is formed on the outer peripheral surface of the large outer diameter portion 3x and the small outer diameter portion 3y. Annular O-ring grooves 3a and 3b are provided around each other. That is, the piston 3 has a plurality of O-ring grooves at different diameter positions.

  Here, the O-ring groove 3a is selected to set a differential pressure for low pressure, and a large-diameter O-ring 6 and a backup ring 7 are mounted in the O-ring groove 3a.

  The body 10 is formed with a through hole 10a having a circular cross section that communicates with the pressure regulating chamber 1 and extends in the vertical direction. A stepped cylindrical shape having an axial line in the vertical direction is formed on the inner peripheral surface of the through hole 10a. A piston guide 4 configured and arranged coaxially with the piston 3 is inserted.

  The piston guide 4 has a step on the inner peripheral surface, and the upper side is a large inner diameter portion 4x and the lower side is a small inner diameter portion 4y.

  Then, the O-ring 8 mounted in the annular O-ring groove on the outer peripheral surface of the piston guide 4 is in pressure contact with the inner peripheral surface of the body 10 opposed thereto, so that the piston guide 4 is liquid-tight to the body 10. It is installed.

  On the upper side of the piston guide 4, a cylindrical spring cylinder 9 having an axis in the vertical direction is arranged coaxially with the piston 3, and the spring cylinder 9 is screwed onto the upper part of the through hole 10 a. The piston guide 4 is pressed downward and fixed to the body 10.

  In this state, the piston 3 is inserted into the piston guide 4, and the outer peripheral surfaces of the large outer diameter portion 3 x and the small outer diameter portion 3 y of the piston 3 are the inner periphery of the large inner diameter portion 4 x and the small inner diameter portion 4 y of the piston guide 4. The O-rings 6 that face each other with a predetermined fitting tolerance and are mounted in the O-ring groove 3a on the outer peripheral surface of the large outer diameter portion 3x of the piston 3 are in pressure contact with the inner peripheral surface of the large inner diameter portion 4x of the piston guide 4. As a result, the piston 3 is guided so as to be slidable in the axial direction.

  In the differential pressure control valve 100, projection is performed by the outer diameter of the seat surfaces 2 s and 3 s of the valve seat 2 and the piston 3 and the outer diameter of the O-ring 6 between the piston 3 and the piston guide 4. The differential pressure for low pressure is determined by the cross-sectional area ratio. That is, the differential pressure for low pressure is determined by mounting the O-ring 6 in the O-ring groove 3a.

  The rear end of the piston 3 is connected to a spring receiver 11 arranged coaxially with the piston 3, and the spring receiver 11 is compressed into a cylindrical hole of the spring cylinder 9 and stacked in a vertical direction. It is biased in the axial direction by a spring (biasing means) 12. As a result, the piston 3 is biased in the direction in which the piston 3 is seated on the valve seat 2 via the spring receiver 11, and the residual liquid port 1c is closed. The biasing means is not limited to a disc spring, and for example, a compression coil spring or the like may be used.

  A pressure adjusting cap 13 is screwed onto the upper portion of the spring cylinder 9, and is arranged between the pressure adjusting cap 13 and the spring receiver 11 by adjusting a vertical screwing position of the pressure adjusting cap 13. The initial loads of the plurality of disc springs 12 are adjusted.

  According to the differential pressure regulating valve 100 configured in this way, in the state shown in FIG. 1, when the pump is started and the low-pressure working liquid is supplied from the tank and flows into the pressure regulating chamber 1 through the inlet 1a, When the pressure of the liquid is equal to or lower than the set pressure for the low pressure, the flow path on the side of the residual liquid port 1c is closed while the piston 3 is seated on the valve seat 2, and the liquid used is the outlet 1b of the pressure regulating chamber 1. When the pressure of the liquid used exceeds the set pressure for low pressure, the piston 3 is lifted away from the valve seat 2 and the flow path on the side of the excess liquid port 1c is opened. It flows out as a surplus liquid through a surplus liquid port 1c from a gap with the valve seat 2, and is returned to the tank via a pipe or the like. When the pressure of the used liquid becomes equal to or lower than the set pressure, the piston 3 is seated on the valve seat 2 and the flow path on the side of the excess liquid port 1c is closed.

  In the case where such a differential pressure regulating valve 100 is a high pressure type differential pressure regulating valve 200 that is applied to a high-pressure liquid, the large-diameter O-ring 6 and the backup ring 7 are removed from the large-diameter O-ring groove 3a. As shown in FIG. 2, an O-ring 16 and a backup ring 17 having a smaller diameter than those of the rings 6 and 7 may be mounted in the small-diameter O-ring groove 3b.

  In such a differential pressure regulating valve 200, the outer diameter of the O-ring 16 between the piston 3 and the piston guide 4 is made smaller than that of the O-ring 6 of the differential pressure regulating valve 100. The projected cross-sectional area ratio for the low pressure is changed without changing the parts to determine the differential pressure for the high pressure, and a high pressure type differential pressure regulating valve is obtained. Therefore, the piston 3 is separated from / seated with respect to the valve seat 2 based on the determined differential pressure for high pressure.

  Here, the piston 3 is provided with a plurality of O-ring grooves for accommodating the O-rings 6 and 16 at positions having different diameters, and an O-ring and a backup ring are arranged in any one of these O-ring grooves 3a and 3b. The differential pressure type pressure regulating valve that can be applied to both high pressure and low pressure is provided, but the piston guide 4 is provided with O-ring grooves at a plurality of different diameter positions, and any one of these O-ring grooves has an O-ring groove. A ring and a backup ring may be provided so that they can be applied to both high pressure and low pressure.

  As described above, in the present embodiment, the piston 3 that partially enters the pressure adjusting chamber 1 for adjusting the pressure of the inflowing working liquid, or the piston 3 is passed and the pressure adjusting chamber 1 A plurality of O-ring grooves have different diameter positions in either one of the piston guides 4 that guide the separation / seat of the piston 3 with respect to the valve seat 2 that forms the surplus liquid port 1c for discharging the used liquid. Since the O-ring is disposed in any one of these O-ring grooves 3a and 3b, a large-diameter O-ring is formed in the large-diameter O-ring groove 3a when applied to a low-pressure use liquid. By disposing the ring 6, a differential pressure for low pressure can be set. When applied to a high-pressure use liquid, a differential pressure for high pressure can be obtained by disposing a small-diameter O-ring 16 in the small-diameter O-ring groove 3 b. The differential pressure can be set optimally by simply changing the O-ring. It can, therefore, can provide a wide range of pressure adjustable differential pressure regulating valve 100, 200 at a low cost. In addition, since only the O-ring and the backup ring need to be changed in this way, it is possible to share parts in the differential pressure regulating valves 100 and 200 having different pressure settings.

  Further, according to the present embodiment, only the O-ring and the backup ring are attached, so that the pressure selected and desired by the user can be set.

  Note that even if one O-ring groove is damaged due to, for example, pressure vibration, the product life can be extended by using another O-ring groove.

  As described above, the present invention has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, an O-ring and a backup ring are particularly preferable. Although the application to the differential pressure control valve is described, the present invention can also be applied to a differential pressure control valve without a backup ring.

  In the above embodiment, the O-ring groove is provided at two different diameter positions. However, the O-ring groove is provided at three or more different diameter positions, and the O-ring is disposed in any of these three or more O-ring grooves. It is also possible to set three or more stages of pressure.

  Further, in the above embodiment, the piston guide 4 and the body 10 are separate parts, but a part of the body may also serve as the piston guide.

  In the present invention, for example, as in the pressure regulating valve described in Japanese Patent Application Laid-Open No. 2001-59579, the pressure regulating chamber has an inlet and a remaining liquid port (outlet). It can also be applied to a pressure control valve that is closed by the pressure control chamber and has a bag-like space. In short, when the pressure of the liquid used is lower than the set pressure, the piston is seated on the valve seat and the flow path On the other hand, when the pressure of the liquid used exceeds the set pressure, the present invention can be applied to a differential pressure regulating valve in which the piston is separated from the valve seat and the flow path is opened.

It is a longitudinal cross-sectional view which shows the differential pressure type pressure regulation valve which concerns on one Embodiment of this invention, and is a longitudinal cross-sectional view at the time of applying to a low pressure use liquid. It is a longitudinal cross-sectional view which shows the differential pressure type pressure regulating valve which concerns on one Embodiment of this invention, and is a longitudinal cross-sectional view at the time of applying to a high pressure use liquid. It is a longitudinal cross-sectional view which shows the basic composition of the differential pressure type pressure regulating valve which concerns on a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pressure regulation chamber, 1c ... Remaining liquid port, 2 ... Valve seat, 3 ... Piston, 3a, 3b ... O-ring groove, 4 ... Piston guide, 6, 16 ... O-ring, 100, 200 ... Differential pressure type pressure regulation valve.

Claims (2)

A pressure regulating chamber (1) for adjusting the pressure of the inflowing working liquid, and a valve seat (2) forming a residual liquid port (1c) for discharging the working liquid in the pressure regulating chamber (1); When a part of the pressure adjusting chamber (1) enters the pressure regulating chamber (1) and the pressure of the working liquid is equal to or lower than a set pressure, the seat is seated on the valve seat (2) and the flow path is closed. When the pressure of the piston (3) exceeds the set pressure, the piston (3) that separates from the valve seat (2) and opens the flow path, and the piston (3) are passed through, A piston in which an O-ring (6, 16) is provided between the piston (3) for guiding the movement at the time of sitting and sealing the fluid tightly with the moving piston (3). A differential pressure regulating valve having a guide (4),
Either one of the piston (3) or the piston guide (4) includes a plurality of O-ring grooves (3a, 3b) for accommodating the O-rings (6, 16) at positions having different diameters, and these The differential pressure regulating valve (100, 200), wherein the O-ring (6, 16) is disposed in any of the O-ring grooves (3a, 3b). The piston (3) has a step on its outer peripheral surface,
The piston guide (4) has a step on its inner peripheral surface, and the inner peripheral surface faces the outer peripheral surface of the piston (3) with a predetermined fitting tolerance,
The difference according to claim 1, wherein the O-ring grooves (3a, 3b) are provided at different diameter positions due to the step of either the piston (3) or the piston guide (4). Pressure regulating valve (100, 200).

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