JPH0720457Y2 - Electric ball valve with switching and flow rate adjustment functions - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention belongs to a three-way opening / closing valve that selectively flows one of two types of fluid, and when switching, two liquids do not mix, Further, the present invention relates to an electrically operated ball valve capable of adjusting the flow rate of each fluid and having a function of simultaneously sealing two liquids.

[Conventional technology]

A three-way port L-port ball valve is used to select and switch between two types of fluid, and a two-way flow rate control valve is used to control the flow rate of the fluid. Conventionally, two units, a three-way switching valve and a two-way control valve, were required to simultaneously perform switching and flow rate adjustment, as shown in FIG.

Recently, as a cooling and heating equipment for buildings, a method has been adopted in which refrigerant and hot soot are supplied to each room, and a fan coil unit in each room performs heating and cooling, and the temperature inside the room is controlled by the fan coil unit in each room. This is very uneconomical because the main and branch pipes that supply the medium must always be filled with the maximum necessary amount for all rooms.
In addition, since each room in the building has a temperature difference over time depending on the direction of the room (window direction), if the flow rate of the branch pipe can be controlled, the medium usage of the entire building will be controlled collectively. It is expected that the diameter of the main pipe can be reduced.

In building facilities, there is a tendency to adopt a batch management type automatic control using a computer, and the valves are also changing to a remote control type (electrically operated type), but as in this example, there are two switching valves and a control valve. In order to drive, at least two electric operating machines are required, which also causes an increase in piping cost.

[Problems to be solved by the invention]

As described above, in the conventional technique, two or more valves, that is, an electric switching valve and an electric flow control valve, are required. Therefore, as the piping cost increases, each electric actuator is operated in order to move the two electric valves individually. However, it has a drawback that it requires electrical wiring to be complicated.

Further, in the conventional flow rate control valve, as shown in Table 2 to be described later, the valve opening degree and the flow rate are not in a proportional relationship, so that it is not easy to adjust the flow rate.

[Means for solving problems]

In view of the above problems, the present invention has a switching valve and a control valve that have both functions in one valve, switches two kinds of fluids, controls the flow rate, and seals each fluid without mixing at the time of switching. It is intended to provide an electrically operated valve having a function of stopping.

In the present invention, an outlet is provided in the downward direction of the two-way ball valve, the flow path of the ball valve body is L-shaped, and the ball valve body is 0 ° to 180 °.
° It aims to solve the problem by paying attention to the fact that three functions of switching, sealing and control can be obtained by rotating it continuously.

[Action]

A piping diagram when the present invention is implemented is shown in FIG. Further, as shown in FIGS. 1 and 2, the refrigerant is introduced from the flow path (5) of the valve body, and the heat medium is introduced from the flow path (6) of the valve body, so that the rotation angle of the ball valve body by the electric operating device is changed. When the flow path (5) of the valve body is set as the starting point, the functions shown in Table 1 can be obtained.

In general, a 90 ° open / close two-way flow control ball valve with a circular port has the characteristic that the valve opening and the flow rate are not directly proportional (when the pressure difference is constant), as shown in FIG. For this reason, known two-way control ball valves are available on the market with various designs such as the shape of the inlet or outlet of the ball valve body, such as the ginkgo leaf shape and seed mouth shape shown in FIG. However, in the present invention, the ball valve body has 18
Since it rotates 0 ° and requires control of the fluid in two directions, it is necessary to make the shape of the flow passage when the fluid enters the ball valve element symmetrical. The rhombus in the direction of rotation of the ball valve element improves the flow rate characteristics.
As shown in FIG. 7, a characteristic close to direct proportionality is obtained at an opening of ° to 80 °.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view showing an embodiment of the present invention, and FIG. 2 is a side view thereof.

A two-way ball valve having valve seats (11) and (12) at two side portions is further provided with a flow path (7) of the valve body at the lower part in the longitudinal direction of the valve body, and these valve seats (11) and (12) are provided. ), A spherical body provided with a valve body L-shaped flow passage (2) for communicating either one of the flow passages (5) and (6) of the valve main body with the flow passage (7) of the valve main body. The ball valve body (3) was attached. The ball valve body (3) is connected to the electric operating device (8) via a stem (1) provided on the vertical axis coaxial with the flow path (7) of the valve body, and is connected around the vertical axis. It is rotatable. The flow path (5) of the valve body of the valve body L-shaped flow path (2) of the ball valve body (3),
The opening shape facing (6) was formed in a long rhombus shape in the rotating direction of the ball valve body (3).

The ball valve body (3) of the present invention starts from a position where the valve body L-shaped flow passage (2) coincides with the flow passage (5) of the valve body, and one signal (0 to 180 °) continuous ( For example, the opening angle of the valve when rotated in proportion to the instrumentation signal current DC4 to 20mA) and the flow rate flowing through the valve at that time are measured, and the result is 100 when the valve opening is 0 °. 0% as a percentage → 90 °
The flow rate at each valve opening is expressed as a relative value and shown in Table 2 as an example of the present invention. The flow rate when the valve opening is 90 ° → 180 ° is the same value as in Table 2 when the valve opening is 90 ° → 0 °.

On the other hand, the results of measuring the valve opening and the flow rate in the same manner as above using a conventional two-way ball valve having a circular port inlet and outlet is also shown in Table 2 as a conventional example.

From Table 2, in the ball valve of the present invention, there is no noticeable change in the flow rate when the opening degree is 0 to 40 °, and the flow rate decreases at a substantially constant rate when the opening degree is 40 to 80 °. That is, the flow rate characteristic as shown in FIG. 7 is obtained. Therefore, the ball valve of the present invention has an opening of 40 to 80 ° and 100 to 140.
It can be seen that the flow rate can be easily adjusted at °.

On the other hand, in the case of the conventional example, the change of the flow rate at each opening is not uniform, and it is understood that the flow rate is difficult to adjust as compared with the example of the present invention.

As described above, according to the ball valve of the present invention, the functions of selective switching, control and sealing of fluid can be obtained as shown in Table 1 above. Since the valve opening and the flow rate are not exactly proportional to each other in the present invention, the flow rate characteristic of the valve may be obtained in advance by experiments or the like, and the flow rate proportional to the signal may be obtained using the angular range that is approximately proportional.

[Effect of device]

As described above, the valve of the present invention mainly contributes to the reduction of the piping initial cost and the energy saving of the heating and cooling system of the building equipment, is highly maintainable, and the reliability is increased.
There are many industrial advantages.

Further, according to the present invention, the three-way electric switching valve and the electric flow rate control valve, which were conventionally required for two units, can be combined into one unit, so that piping in a narrow space is possible, and a valve for easily adjusting the flow rate is provided. Has the effect obtained. In addition, the trouble that is likely to occur in the motor-operated valve can be halved, which is a great effect.

The effects of the present invention can be summarized as follows: ● Reduction of piping initial cost ● Easy adjustment of flow rate ● Reduction of piping space ● Reduction of electric wiring, simplification of electric wiring system ● Reduction of troubles ● Reduction of piping joints Reduction of leakage due to ● Reduction of maintenance time In this invention, the cooling and heating system in the building equipment was explained as an example. However, the flow passage (7) of the valve body is used for one kind of fluid inlet,
It is also possible to use the flow paths (5) and (6) of the valve body as outlets to form a branch control system, which is considered to be an effective idea having many applications.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is an external view showing the shape of a flow path of a ball valve element of a known two-way flow control ball valve. , FIG. 4 is a piping diagram showing an example of use of the present invention, FIG. 5 is a piping diagram showing a conventional piping system, FIG. 6 is a flow characteristic diagram of a conventional ball valve with a two-way circular port, and FIG. FIG. 4 is a flow rate characteristic diagram of the valve of the present invention. 1 ... Stem 2 ... Valve body L-shaped flow path 3 ... Ball valve body 4 ... One end of L-shaped flow path 5 ... Flow path of valve body 6 ... Flow path of valve body 7 ... Valve Flow path of main body 8 ...... Electric actuator 9 ...... Valve main body 10 ...... Lid 11 ...... Valve seat 12 ...... Valve seat 13 ...... Ginkgo leaf type flow path 14 ...... Seed mouth type flow path 15 ...... Switching, Flow control ball valve 16 …… Fan coil unit 17 …… Switching ball valve 18 …… Control valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hidenori Fujisawa 8-21-1, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Shinichi Aida 8-21, Ginza, Chuo-ku, Tokyo No. 1 Takenaka Corporation Tokyo Main Store (72) Inventor Toshiro Kadota 8-21-1, Ginza, Chuo-ku, Tokyo Stockholder Takenaka Corporation Tokyo Main Store (72) Inventor Fukui Yasuo Chuo-ku, Tokyo Ginza 8-21-1, Takenaka Corporation Tokyo Main Store (72) Inventor Toshiyuki Ogawa 5-1190, Kogishi Dori, Suwa City, Nagano Toyo Valve Co., Ltd. Suwa Plant (72) Inventor Takashi Koiwai Nagano 5-11-90, Kogishi-dori, Suwa-shi, Japan Toyo Valve Co., Ltd. Suwa factory (72) Inventor Susumu Fukushima 4-2-8, Kanda Surugadai, Chiyoda-ku, Tokyo Takasago Heat Gaku Kogyo Co., Ltd., Tokyo Head Office (56) References: Showa 55-119464 (JP, U) Showa 51-91830 (JP, U) Showa 49-97826 (JP, U) Special public Showa 41- 1271 (JP, B1)

Claims (2)

[Scope of utility model registration request] 1. In an electrically operated switching ball valve having a three-way port, each of the three-way ports is located below the axis of the stem (1).
A valve body is formed by the flow passage (7) of the valve body at one place and the flow passages (5) and (6) of the valve body at two places on the center line orthogonal to the axis of the stem (1). The flow path (7) of the valve body in which the opening at one end side of the flow path of the ball valve body (3) having the valve body L-shaped flow path (2) in the main body is provided on the axis of the stem (1). The ball valve body (3) is rotatably installed with respect to the axis of the stem (1) so that the flow passages (5), (6) and (7) of the valve body are formed in a circular shape. The opening of the valve body L-shaped flow path (2) on the other end side facing the flow paths (5) and (6) of the valve body is a rhombus elongated in the rotational direction of the ball valve body (3). The lengthwise dimension is the flow path of the valve body (5)
A spherical switching flow control valve, which is formed to have an inner diameter of (6) or less to enable fluid switching operation and flow rate adjustment. 2. The valve according to claim 1, wherein the fluid can be switched, sealed, and the flow rate can be adjusted by an electric signal.