JP6901161B2 - Flow control valve - Google Patents

Description

The present invention relates to a flow rate adjusting valve including a valve body provided with a valve chamber and a valve port (orifice) and a valve body that changes the flow rate of a fluid flowing through the valve port according to a lift amount, and particularly. The present invention relates to a flow rate adjusting valve suitable for adjusting a refrigerant flow rate in a heat pump type heating / cooling system or the like.

The relationship between the valve opening (lift amount) and the flow rate in the flow rate adjusting valve, that is, the linear characteristic and the equal percent characteristic are well known as the flow rate characteristics. The linear characteristic refers to a characteristic in which the rate of change of the flow rate with respect to a change in the valve opening is constant, and the equal percentage characteristic refers to a characteristic in which the rate of change of the valve opening is proportional to the flow rate.

FIG. 5 shows a main part of an example of a flow rate regulating valve in which an equal percent characteristic can be obtained. The flow rate adjusting valve 1'in the illustrated example is used to adjust the flow rate of the refrigerant in a heat pump type heating / cooling system or the like, and has a valve chamber 6, a valve seat 8 made of an inverted conical base surface, and a valve port made of a cylindrical surface. A valve body 5 provided with 15 and a valve body 20 that changes the flow rate of the fluid flowing through the valve port 15 according to the amount of lift from the valve seat 8 are provided, and the valve body 20 is described in, for example, Patent Document 1. As described above, a valve shaft provided with a male screw, a guide stem provided with a female screw, a screw feed type elevating drive mechanism including a stepping motor, and the like, are moved up and down so as to be brought into contact with and separated from the valve seat 8.

The valve body 20 has a contact surface portion 22 that comes into contact with the valve seat 8 and an elliptical curved surface portion 23 that is connected to the lower side of the contact surface portion 22 and is connected to the lower side to obtain an equal percent characteristic as a flow rate characteristic. The curved surface portion 23 has a shape similar to the lower half of the egg, and the outer peripheral surface thereof is gradually bent from the upper end 23a to the lower end 23b (the curvature is large).

In the flow control valve 1'in which such an equal percent characteristic is obtained, when the refrigerant flow direction is from the valve chamber 6 to the valve port 15, as shown by the thick arrow in FIG. 5, the refrigerant is the curved surface portion 23. However, when passing through the valve port 15, sudden pressure fluctuations and refrigerant separation phenomena are likely to occur, and along with this, vortices and cavitation are likely to occur and grow, and there is a problem that relatively loud noise is generated.

It should be noted that providing the elliptical curved surface portion 23 on the valve body 20 in order to obtain the equal percent characteristic as described above has problems in terms of processing cost, cost effectiveness, etc., and is therefore shown in FIG. , A flow control valve 1'' has been developed so that characteristics close to the equal percent characteristics can be obtained. In the flow rate adjusting valve 1'' of the illustrated example, the valve chamber forming member 6A is fixed, and the valve port 17 is composed of a first valve port 17A formed of a short cylindrical surface and a second valve port 17B formed of a conical base surface. The flow rate of the fluid flowing through the valve port 17 according to the lift amount from the valve seat 8 and the valve body 5 to which the pipe joint 14 to which the conduit is connected is connected to the lower outer periphery of the second valve port 17B. It includes a valve body 30 to be changed.

The valve body 30 has a seating surface portion 32 seated on the valve seat 8 and a curved surface portion 33 connected to the lower side of the seating surface portion 32 to obtain a characteristic similar to an equal percent characteristic as a flow rate characteristic. The curved surface portion 33 has a plurality of stages (here, 5 stages) in which the control angle (intersection angle between the central axis O of the valve body 30 and the line parallel to the line) is gradually increased as it approaches the tip so as to imitate an elliptical sphere. The first control angle θ1 of the conical tapered surface portion 33A of the uppermost stage is usually set to 3 ° <θ1 <15 ° (here, 5 °), and the lowermost conical tapered surface portion 33A to 33E is provided. The conical tapered surface portion 33E is a conical surface with a sharp point.

On the other hand, in Patent Document 2, in a flow rate adjusting valve in which a normal linear characteristic can be obtained, the dimensional shape of the valve port is specified, and as described above, the pressure fluctuation and the refrigerant peeling when passing through the valve port are specified. A device that suppresses noise generated due to a phenomenon or the like is disclosed.

Japanese Unexamined Patent Publication No. 2012-172839 Japanese Patent No. 5696093

However, in the flow rate adjusting valve described in Patent Document 2, since it is necessary to set the valve port length to be considerably long, there is a problem that the pressure loss becomes large and it is difficult to obtain an appropriate refrigerant flow rate. Since the size and shape of the mouth are matched to the valve body for linear characteristics, even if it is applied to the flow rate control valve having the above-mentioned equal percent characteristics and characteristics similar to it, a sufficient noise reduction effect cannot be obtained. ..

The present invention has been made in view of the above circumstances, and an object of the present invention is to be able to effectively reduce noise generated due to pressure fluctuation and refrigerant peeling phenomenon when passing through a valve port, and to reduce pressure loss. The purpose of the present invention is to provide a flow rate adjusting valve that can reduce the amount of noise.

In order to achieve the above object, the flow rate adjusting valve according to the present invention basically has a valve body provided with a valve chamber and a valve port, and a flow rate characteristic equal to or similar to that of the valve body. It is provided with a valve body having a curved surface portion which is designed to change the flow rate of the fluid flowing through the valve port according to the lift amount, and the curvature or control angle of the curved surface portion is continuously or stepwise increased as it approaches the tip. In the flow rate adjusting valve, the diameter of the valve opening is gradually increased in three or more steps as the distance from the valve chamber is increased, and the first valve opening portion having a diameter of D1 and the second valve opening of D2 are sequentially increased from the valve chamber side. A valve port portion and a third valve port portion of D3 are provided, and 1.08 <(D2 / D1) <1.37 and 1.08 <(D3 / D2) <1.43. It is characterized by that.

In a preferred embodiment, the diameter of the fourth valve opening on the side of the valve chamber from the third valve opening or the inner diameter of the pipe joint connected to the third valve opening is D4, and (D2 / D1) <(D3). / D2) <(D4 / D3).

In another preferred embodiment, a truncated cone-shaped tapered surface portion is formed between the valve openings.

In another preferred embodiment, the valve port length of the second valve port portion is L2, and the length from one end of the second valve port portion to the other end of the third valve port portion is L4, and 1.0 <( L2 / D1) <2.0 and 2.3 <(L4 / D1) <4.0.

The curved surface portion of the valve body is preferably an elliptical spherical surface portion, a multi-stage conical tapered surface portion whose control angle is gradually increased as it approaches the tip, or an elliptical spherical surface portion and one or a plurality of conical tapered surface portions. It is composed of a combination of.

In the flow rate adjusting valve according to the present invention, the diameter of the valve port is gradually increased in three or more steps from the valve chamber side to the lower end side, so that the refrigerant pressure gradually recovers when passing through the valve port, and pressure fluctuation is suppressed. Rectification is achieved. Further, by setting (D2 / D1) and (D3 / D2) within a specific range, the generation / growth of vortices and cavitation due to pressure fluctuation and refrigerant separation phenomenon can be suppressed. Further, by setting (D2 / D1) <(D3 / D2) <(D4 / D3), the flow becomes smoother. Therefore, for example, in a flow rate adjusting valve having an equal percent characteristic and a characteristic similar thereto, noise The level can be lowered considerably.

Further, by setting (L2 / D1) and (L4 / D1) to a specific range, the valve opening length L2 is the one described in Patent Document 2 and the flow rate adjustment having the equal percent characteristic shown in FIG. Since it is shorter than the valve 1', the pressure loss is small and an appropriate refrigerant flow rate can be obtained.

The cross-sectional view of the main part which shows the main part in one Embodiment of the flow rate control valve which concerns on this invention. (A) A list showing the measured value data of the verification valves Nos. 1 to 4 in which some of the specifications and specifications have been changed, and (B) Verification conditions A to 4 for confirming and proving the operation and effect of the present invention. A list showing G. (A) A graph showing the measured values of verification valves Nos. 1 to 4 for each of the verification conditions A to G, with the diameter ratio: D2 / D1 on the horizontal axis and the noise level [dB] on the vertical axis. B) The graph showing the measured values of the verification valves Nos. 1 to 4 for each of the verification conditions A to G, with the diameter ratio: D3 / D2 on the horizontal axis and the noise level [dB] on the vertical axis. (A) A list showing the measured value data of the verification valve Nos. 5 to 8 in which some of the specifications and specifications have been changed, (B) Verification condition H, for confirming and demonstrating the operation and effect of the present invention. List showing I, (C) The valve opening length ratio: L4 / D1 is taken on the horizontal axis, the sound pressure level [dB] is taken on the vertical axis, and the measured values of the verification valves Nos. 5 to 8 are the verification conditions. The graph which shows for each H and I. A partial cross-sectional view showing a main part of an example of a flow control valve in which equal percent characteristics are obtained. (A) A partial cross-sectional view when the valve is closed and (B) a partial cross-sectional view when the valve is opened, showing a main part of an example of a flow rate adjusting valve in which characteristics close to the equal percent characteristic can be obtained.

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

FIG. 1 is a cross-sectional view of a main part showing a main part in one embodiment of the flow rate adjusting valve according to the present invention. In addition, in FIG. 1, a common reference numeral is attached to a portion corresponding to each portion of the conventional flow rate adjusting valve 1 ″ shown in FIG. 6 described above.

The flow rate adjusting valve 1 of the illustrated embodiment is the same as the conventional flow rate adjusting valve 1'' shown in FIG. 6 described above, so that a characteristic close to the equal percent characteristic can be obtained, and the valve chamber forming member. 6A is fixed, and the flow rate of the fluid flowing through the valve port 10 according to the lift amount from the valve seat 8 and the valve body 5 provided with the valve port 10 (details will be described later), which is a feature of the present invention, is increased. It includes a valve body 30 to be changed. The valve body 30 has the same configuration as the conventional flow rate adjusting valve 1'' shown in FIG. 6, and has a seating surface portion 32 seated on the valve seat 8 and an equal percent characteristic as a flow rate characteristic connected to the lower side of the seating surface portion 32. It has a curved surface portion 33 for obtaining a characteristic similar to. The curved surface portion 33 has a plurality of stages (here, 5 stages) in which the control angle (intersection angle between the central axis O of the valve body 30 and the line parallel to the line) is gradually increased as it approaches the tip so as to imitate an elliptical sphere. The first control angle θ1 of the uppermost conical tapered surface 33A is set to 3 ° <θ1 <15 ° (here, 5 °), and the lowermost conical taper The surface portion 33E is a conical surface with a sharp point.

The valve port 10 that opens into the valve chamber 6 has a cylindrical first valve port portion 11 having a diameter of D1, a cylindrical second valve port portion 12 having a diameter of D2, and a cylindrical valve port portion 12 having a diameter of D2, in order from the valve chamber 6 side. A pipe joint 14 having an inner diameter of D4, which has a cylindrical third valve opening portion 13 having a diameter of D3 and a conduit is connected to the lower outer circumference of the third valve opening portion 13, is connected. Here, D1 <D2 <D3 <D4, and the valve port 10 is gradually increased in three stages as its diameter increases away from the valve chamber 6.

Here, in the present embodiment, (caliber ratio: D2 / D1) <(caliber ratio: D3 / D2) <(caliber ratio: D4 / D3), and (D2 / D1) and (D3 / D2). Is set within a specific range, that is, 1.08 <(D2 / D1) <1.37 and 1.05 <(D3 / D2) <1.43, respectively, based on prototype experiments and the like. There is.

Further, a truncated cone-shaped tapered surface portion 16 having a taper angle of θu is formed between (the stepped portion) between the first valve opening portion 11 and the second valve opening portion 12, and the second valve opening portion 12 and the third valve opening portion 12 and the third. A truncated cone-shaped tapered surface portion 18 having a taper angle of θv is formed between the valve port portion 13 and the valve port portion 13.

Further, the valve port length of the first valve port portion 11 (the length in the central axis O direction) is L1, the valve port length of the second valve port portion 12 is L2, and the valve port length of the third valve port portion 13 is L3. The length from the upper end of the second valve opening portion 12 to the lower end of the third valve opening portion 13 is L4, and (valve opening length ratio: L2 / D1) and (valve opening length ratio: L4 / D1) are respectively. Based on a prototype experiment or the like, it is set within a specific range, that is, 1.0 <(L2 / D1) <2.0 and 2.3 <(L4 / D1) <4.0.

In the flow rate adjusting valve according to the present invention having such a configuration, the diameter of the valve port 10 is gradually increased in three steps as the distance from the valve chamber 6 increases, so that the refrigerant pressure gradually recovers when passing through the valve port. , Pressure fluctuation is suppressed and rectification is achieved. Further, by setting (D2 / D1) and (D3 / D2) within a specific range, the generation / growth of vortices and cavitation due to pressure fluctuation and refrigerant separation phenomenon can be surely suppressed. Further, by setting (D2 / D1) <(D3 / D2) <(D4 / D3), the flow becomes smoother. Therefore, the noise level in the flow rate adjusting valve having the equal percent characteristic and the characteristic similar to it. Can be made considerably lower.

Further, by setting (L2 / D1) and (L4 / D1) to a specific range, the flow rate at which L2 (or L1) is described in Patent Document 2 or has the equal percent characteristic shown in FIG. Since it is shorter than the regulating valve 1', the pressure loss is small and an appropriate refrigerant flow rate can be obtained.

[Verification test and results to verify the appropriate range of diameter ratio and valve opening length ratio]
In order to confirm and prove the above-mentioned effects, the present inventors have changed some of the specifications and specifications as shown in the list of FIGS. 2 (A) and 4 (A). Caliber ratio << (D2 / D1), (D3 / D2) >> verification valves Nos. 1 to 4, and valve opening length ratio << (L4 / D1) >> verification valves Nos. 5 to 8 are prepared. A verification test was conducted under the conditions A to G shown in 2 (B) and the conditions H and I shown in FIG. 4 (B). Diameter ratio << (D2 / D1), (D3 / D2) >> The test results of the verification valves Nos. 1 to 4 are shown in FIGS. 3 (A) and 3 (B), and the valve opening length ratio << (L4 / D1). >> The test results of the verification valves Nos. 5 to 8 are shown in FIG. 4 (C).

In FIG. 3A, the horizontal axis is the diameter ratio: D2 / D1, the vertical axis is the noise level [dB], and the measured values of the verification valves Nos. 1 to 4 are used as the verification conditions A to G. In the graph shown for each, FIG. 3B, the horizontal axis is the diameter ratio: D3 / D2, and the vertical axis is the noise level [dB], and the measured values of the verification valves Nos. 1 to 4 are verified. In the graphs shown for each of the conditions A to G, FIG. 4 (C) shows the valve opening length ratio: L4 / D1 on the horizontal axis and the sound pressure level [dB] on the vertical axis, and the verification valve No. 5 It is a graph which showed the measured value of ~ 8 for each verification condition H, I.

Further, in the graphs of FIGS. 3 (A), 3 (B) and 4 (C), the level 0 (reference) is the flow rate regulating valve 1 having a characteristic similar to the conventional equal percent characteristic shown in FIG. 6 described above. '' (Hereinafter referred to as the conventional product) noise level and sound pressure level are shown.

From the graph of FIG. 3 (A), the noise level is lower than that of the conventional product when the diameter ratio: (D2 / D1) is 1.05 to 1.45 (nearly the entire range shown in the figure), and in particular, the valve No. The noise reduction effect per valve No. 2 is large at .3, but (D2 / D1) is 1.08 (caliber ratio of valve No. 4) to 1.37 (≈ (1.31 + 1.42) / 2, It was confirmed that the noise can be considerably reduced as compared with the conventional product if it is within the range (diameter ratio between valve No. 2 and valve No. 1).

From the graph of FIG. 3 (B), the noise level is lower than that of the conventional product when the diameter ratio: (D3 / D2) is 1.00 to 1.50 (almost the entire range shown in the figure), and in particular, the valve No. Although the noise reduction effect per .3 and valve No. 2 is large, (D3 / D2) is 1.08 to 1.43 (≈ (1.35 + 1.50) / 2, valve No. 3 and valve No. 4). It was confirmed that the noise can be reduced considerably compared to the conventional product if it is within the range of the diameter ratio in the middle of the above.

From the graph of FIG. 4 (C), the sound pressure level is equal to or lower than that of the conventional product when the valve opening length ratio: (L4 / D1) is 2000 to 4.00 (almost the entire range shown in the figure). In particular, the noise reduction effect per valve No. 6 is large, but (L4 / D1) is 2.30 (larger than the valve opening length ratio of valve No. 5) to 4.00 (valve No. 8). It was confirmed that the noise reduction effect can be obtained as compared with the conventional product (for example, the sound pressure level is 2 dB or more lower than the standard under the condition I) if it is within the range of the valve port length ratio).

Although not shown, if the valve opening length ratio: (L2 / D1) is within the range of 1.0 to 2.0, the sound pressure level is equal to or lower than that of the conventional product, and the conventional product. It has also been confirmed that a more noise reduction effect can be obtained.

In the above-described embodiment, the case where the present invention is applied to the flow rate regulating valve 1 having a characteristic similar to the equal percent characteristic has been described, but the present invention is not limited to this, and the present invention is shown in FIG. It can be applied not only to the flow rate adjusting valve 1'having the equal percent characteristic as described above, but also to the flow rate adjusting valve having the linear characteristic described in Patent Documents 1, 2 and the like.

Further, in the above embodiment, the curved surface portion of the valve body is composed of a plurality of conical tapered surface portions in which the control angle is gradually increased toward the tip side, but the present invention is not limited to this, and FIG. The elliptical spherical surface portion as shown, or the lower end portion (elliptical spherical crown portion) of the elliptical spherical surface portion may be cut off, or further, by combining the elliptical spherical surface portion with one or more conical tapered surface portions or the like. It may be configured.

Further, in the above-described embodiment, the pipe joint 14 having an inner diameter of D4 is connected to the third valve opening portion 13, but the fourth valve having a diameter of D4 is connected to the valve chamber side of the third valve opening portion 13. Needless to say, even if the mouth is formed, the same action and effect as described above can be obtained.

1 Flow control valve 5 Valve body 6 Valve chamber 10 Valve port 11 1st valve port 12 2nd valve port 13 3rd valve port 14 Pipe joint 30 Valve body 33 Curved surface part D1 Diameter of 1st valve port D2 No. 2 Valve port diameter D3 Third valve port diameter D4 Pipe joint inner diameter L1 First valve port length L2 Second valve port length L3 Third valve port length L4 2nd and 3rd valve opening length

Claims (5)

A valve body provided with a valve chamber and a valve opening, and a curved surface portion designed to obtain equal percent characteristics or similar characteristics as the flow rate characteristics and change the flow rate of the fluid flowing through the valve opening according to the lift amount. A flow rate adjusting valve comprising a valve body having a valve body, and the curvature or control angle of the curved surface portion is continuously or stepwise increased as it approaches the tip.
The diameter of the valve opening is gradually increased in three or more steps as the distance from the valve chamber increases.
From the valve chamber side, a first valve opening portion having a diameter of D1, a second valve opening portion having a diameter of D2, and a third valve opening portion having a diameter of D3 are provided, and 1.08 <(D2 / D1) <1. A flow rate adjusting valve characterized in that 37 and 1.08 <(D3 / D2) <1.43. (D2 / D1) <(D3 / D2) < The flow rate adjusting valve according to claim 1, wherein the flow rate adjusting valve is (D4 / D3). The flow rate adjusting valve according to claim 1 or 2, wherein a truncated cone-shaped tapered surface portion is formed between the valve openings. The valve port length of the second valve port is L2, and the length from one end of the second valve port to the other end of the third valve port is L4, and 1.0 <(L2 / D1) <2. The flow rate adjusting valve according to any one of claims 1 to 3, wherein the flow rate adjusting valve is .0 and 2.3 <(L4 / D1) <4.0. The curved surface portion of the valve body is formed by an elliptical spherical portion, a multi-stage conical tapered surface portion whose control angle is gradually increased as it approaches the tip, or a combination of the elliptical spherical surface portion and one or more conical tapered surface portions. The flow rate adjusting valve according to any one of claims 1 to 4, wherein the flow rate adjusting valve is configured.

Images