CN212360910U - Equal proportion accurate flow regulating pressure regulating valve - Google Patents

Abstract

An equal proportion accurate flow regulating pressure regulating valve comprises a valve body, a spherical opening and closing piece, a valve rod, a valve cover and a valve rod sealing mechanism, wherein the cross section of a medium passing hole is in a water drop shape with one large end and one small end; the shapes of the respective portions of the linear strips constituting the sectional shape of the medium passing hole are adjusted by routine experiments so that the medium passing hole conforms to the condition that the variation relationship of the flow rate of the medium passing through the medium and the angle of the rotary valve rod is linear or nearly linear. The utility model has the advantages that: the lower part of the valve rod is provided with the conical rod, the conical rod is tightly contacted with the conical hole of the valve body by utilizing the pressure of the pressure spring, the sealing state can be kept for a long time, and the service life is prolonged; the section of the through hole on the spherical opening and closing part of the ball valve is in a shape with one large end and one small end, the rotating angle and the flow change relation are basically changed linearly when the flow is regulated, and the metering accuracy is improved.

Description

Equal proportion accurate flow regulating pressure regulating valve

Technical Field

The utility model relates to an accurate air-vent valve that flows of accent of equal proportion, mainly used need the accurate pipe-line system who adjusts flow, like the flow control of heat supply pipeline.

Background

The valves of the heat supply pipeline in the prior art generally adopt ball valves, and the valves have two problems, namely, the sealing of the valve rod adopts packing, and the sealing effect is poor after the valve rod is used for a long time; secondly, the spherical opening and closing piece of the ball valve is provided with a circular through hole, and the relationship between the rotating angle and the flow change is suddenly changed and not linearly changed when the flow is regulated, so that the metering is inaccurate.

Disclosure of Invention

The utility model aims at providing an accurate accent of equal proportion flows air-vent valve to solve the above-mentioned problem that prior art exists.

The technical scheme of the utility model is that: an equal proportion accurate flow regulating pressure regulating valve comprises a valve body, a spherical opening and closing piece, a valve rod, a valve cover and a valve rod sealing mechanism, wherein an inlet and an outlet are respectively arranged at two ends of the valve body; the lower end of the valve rod is connected with the spherical opening and closing piece, a valve rod sealing mechanism is arranged between the valve rod and a valve rod hole at the top end of the valve body, and the valve rod sealing mechanism is fastened through a valve cover; the shapes of the partial lines forming the cross-sectional shape of the medium passing hole are adjusted through routine experiments, so that the medium passing hole is in accordance with the linear or nearly linear change relationship between the flow rate of the liquid medium and the angle of the rotating valve rod under the premise that the pressure of the passing liquid medium is constant.

The utility model has the advantages that: the lower part of the valve rod is provided with the conical rod, the conical rod is tightly contacted with the conical hole of the valve body by utilizing the pressure of the pressure spring, the sealing state can be kept for a long time, and the service life is prolonged; the section of the through hole on the spherical opening and closing part of the ball valve is in a shape with one large end and one small end, the rotating angle and the flow change relation are basically changed linearly when the flow is regulated, and the metering accuracy is improved.

Drawings

Fig. 1 is a schematic cross-sectional view of the overall structure of an embodiment of the present invention;

fig. 2 is a left side view of the spherical closure of fig. 1.

Detailed Description

Referring to fig. 1 and 2, the utility model relates to an equal-proportion accurate flow regulating valve, which comprises a valve body 1, a spherical opening and closing part 2, a valve rod 3, a valve cover 4 and a valve rod sealing mechanism, wherein, an inlet 11 and an outlet 12 are respectively arranged at the two ends of the valve body 1, the spherical opening and closing part 2 is arranged in a cavity at the middle part of the valve body, and a medium passing hole 21 is arranged on the spherical opening and closing part 2; the lower end of the valve rod 3 is connected with the spherical opening and closing piece 2, a valve rod sealing mechanism is arranged between the valve rod 3 and a valve rod hole at the top end of the valve body 1, and the valve rod sealing mechanism is fastened through a valve cover 4. The shape of the individual wire strips forming the cross-sectional shape of the medium passing hole 21 is adjusted by routine experimentation to conform to the substantially linear relationship between the flow rate of the (mainly liquid, e.g. water) medium passing and the angle of rotation of the valve stem 3.

The structure of the valve rod sealing mechanism is as follows: a conical rod 32 is arranged at the lower part of the valve rod 3, and a valve rod hole of the valve body 1 is a conical hole matched with the conical rod 32; a sealing ring 6 is arranged between the conical rod 32 and the valve rod hole of the valve body 1; a flange 31 is arranged on the upper surface of the conical rod 32, a pressure spring 5 is arranged on the valve rod 3 on the flange 31, and the upper surface of the pressure spring 5 is fastened by the valve cover 4; a non-circular cylinder 33 (such as an isosceles triangle or a square) is provided at the bottom end of the valve stem 3, and a non-circular blind hole 22 slidably engaged with the cylinder 33 is provided at the top end of the spherical shutter 2. The cooperation of the non-circular cylinder 33 and the non-circular blind hole 22 can drive the spherical opening and closing member 2 and move up and down, thereby providing space and conditions for the downward movement of the valve rod 3. Because the conical rod 32 is matched with the conical hole of the valve body 1, the downward pressure is applied to the valve rod 3 through the pressure spring 5, so that the conical rod 32 is kept in close contact with the conical hole of the valve body 1, and the sealing performance of the valve rod sealing mechanism can be kept even under the condition that the sealing ring 6 is abraded or the elasticity weakening is reduced after long-term use.

Claims (2)

1. An equal-proportion accurate flow regulating and pressure regulating valve comprises a valve body (1), a spherical opening and closing piece (2), a valve rod (3), a valve cover (4) and a valve rod sealing mechanism, wherein an inlet (11) and an outlet (12) are respectively arranged at two ends of the valve body (1), the spherical opening and closing piece (2) is arranged in a cavity in the middle of the valve body, and a medium through hole (21) is formed in the spherical opening and closing piece (2); the lower end of the valve rod (3) is connected with the spherical opening and closing piece (2), a valve rod sealing mechanism is arranged between the valve rod (3) and a valve rod hole at the top end of the valve body (1), and the valve rod sealing mechanism is fastened through a valve cover (4), and the valve rod sealing mechanism is characterized in that the cross section of the medium through hole (21) is a transverse long round hole, and one end of the transverse long hole is small in width and the other end of the transverse long hole is large; the shapes of the partial lines forming the cross section of the medium passing hole (21) are adjusted through routine experiments, so that the medium passing hole (21) is in accordance with the change relation between the flow rate of the liquid medium and the angle of the rotating valve rod (3) which is linear or nearly linear under the premise that the pressure of the passing liquid medium is constant.

2. The proportional precision flow regulating pressure regulating valve according to claim 1, wherein said valve stem sealing mechanism is configured to: a conical rod (32) is arranged at the lower part of the valve rod (3), and a valve rod hole of the valve body (1) is a conical hole matched with the conical rod (32); a sealing ring (6) is arranged between the conical rod (32) and the valve rod hole of the valve body (1); a flange (31) is arranged on the conical rod (32), a pressure spring (5) is arranged on the valve rod (3) on the flange (31), and the upper surface of the pressure spring (5) is fastened by the valve cover (4); the bottom end of the valve rod (3) is provided with a non-circular cylinder (33), and the top end of the spherical opening and closing piece (2) is provided with a non-circular blind hole (22) which is in sliding fit with the cylinder (33).

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