JPS58191377A - Flow path selector valve - Google Patents

Abstract

PURPOSE:To decrease a time of electric current conduction in a solenoid part and save energy, by holding a valve shaft of a solenoid driven selector valve suitable for a room cooler or the like through screw action. CONSTITUTION:An internal thread part 10 is provided to a passage 9 extending through the axial direction in a housing 8, and an external thread part 14 of a valve shaft 13 is rotatably fitted to the part 10. A rotor 19 in a stepping motor part 7 is integrally formed with the shaft 13, and the rotor 19 is rotated to laterally move the shaft 13, then a valve can be selected. In case of holding the shaft 13 to a prescribed position, the shaft 13 is held by screw action, and continuous conduction of an electric current is not necessary for a stator 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-way switching valve mainly used as a bypass valve (2) for cold water, etc. in an air-conditioning system with equal pressure.

Conventionally, in a cooling circuit using a fan coil unit ■ as shown in Figure 1, when cooling is no longer needed in a certain room, the blower N rotation of the fan coil unit ■ is stopped for a long period of time, and air conditioning in other rooms is stopped. If water continues to flow without stopping the circulation pump ■ for cooling, heat loss will increase and the fan coil unit (2) will become overcooled.
There was a time when moisture in the indoor air was bound to the surface of the Fan Coil Units (2) and wet the floor.

In order to solve these problems (4), conventionally, an electromagnetically driven three-way valve is used as a bypass valve (■), and when the operation switch that operates the blower of the fan coil unit (■) is stopped, the fan coil unit (■) heats up. Replacement - The method used was to stop the water supply to ■ and bypass it to water cooling M■, but when switching to either one, K had to be constantly energized during that time, resulting in wasted energy consumption. Moreover, the electromagnetically driven three-way valve has the disadvantage of being expensive.

In view of the above-mentioned drawbacks, the present invention provides a flow path switching valve that is labor-saving, energy-saving, and requires only energization during switching, and is also inexpensive.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 and 8-. Note that the arrows in the figure indicate the flow of fluid.

As shown in FIG. 2, the present invention is comprised of a valve body part (2) and a motor part (2). To explain in detail the structure of each part of the motor part (■) using a Stitching Tanabata, in the valve body part (■), there is a female thread part in the oil passage (■) that penetrates axially into the housing (■). At the same time, the passage 1) has at least two V connection ports (O) facing the female threaded part [phase] K of the valve stem Q, and the male threaded part [phase] of the valve stem Q.
It is combined with rotating GIJ Noh. Furthermore, in addition to the above-mentioned passageway (1), a communication hole (@) is provided in the axial direction inside the housing (2), which introduces the fluid from the west of the pipe connection port from the first chamber (@) to the second chamber (0). It also functions to alleviate the thrust generated from the fluid pressure difference between the first chamber @ and the second chamber [phase] and reduce the required driving force of the valve shaft @.

On the other hand, in the stepping motor section ■, the valve shaft @ and the rotor shaft are integrally formed, and the valve body section of the valve shaft O is
A threaded portion (phase) is provided at the gs end, and the opposite shaft is supported by a bearing ring. Further, a stator beam is provided on the outer periphery of the motor housing @ in correspondence with the four trochanters.

Since the flow path switching valve according to the present invention is configured as described above, by applying a pulse current to the stator [phase], the valve shaft 0 formed integrally with the rotating shaft rotates, and further,
It also moves in the axial direction due to the screw action between the female threaded part [phase] of the passage (2) and the male thread FiLn of the valve stem 0. As a result, the valve stem @ in the passage ■ of the housing ■ section moves to the left or right while rotating due to the forward and reverse rotation of the rotor shaft, and the male threaded part [phase] of square-0 moves to the piping connection port @. Since either one of the [phases] is occluded, the flow path can be switched. In other words, change the flow path from the state shown in Fig. 2 to the state shown in Fig. 3, or
The reverse pressure can be switched from the state shown in Fig. S to the state shown in Fig. 2 [IK].

In addition, the switching position in this case is that the number of pulses of current applied to stator 0 is set between pipe connection port @ 0, passage ■, and valve stem 0.
You can set it in advance from the screw bifuchi of . For example, as shown in Figure 2, the axial movement distance L required for switching is
=80 Kagome, screw is metric thread, screw bifuchi 0.5 thin,
If the stepping motor's stepping angle is 7.5°/pulse pulse speed is 7201160' 1.0 pps, the required energization time is - "PX 80
, ,.

÷720 = 4 seconds.

In other words, move the valve stem 80 degrees to the right from the bottom of Figure 2 and switch to the state shown in Figure 8. Fix the valve stem 0 so that it rotates in the direction of the hour hand when viewed from the side of the valve body. It is sufficient to energize the stator O for 4 seconds, and conversely, to switch from the state shown in FIG. 8 to the state shown in FIG. 2, it is sufficient to energize the stator K for 4 seconds so that it rotates in the counterclockwise direction.

By the way, regarding the fluid sealing property of the screw K, according to the inventor's experiments, when the metric fine screw M5, H, 0.5 mm, JIS class 1, the number of fitting screw threads is 40, water leakage is The pressure difference between the inlet and water outlet is 1o.
The pressure difference was 0°18117cm in Kg/d, and 0.018j/in in IKg/j, which was a so-called small leakage and was not a problem for dormitory use.

As can be easily understood from the above explanation, in addition to exhibiting the same function as a conventional electromagnetically driven three-way valve, a simple metric thread provides fluid sealing, and a stepping rotor and metric thread move the valve shaft [phase]. Since it has a simple structure that allows the user to perform the following steps, it is possible to solve the problems of the conventional method.

That is, (1) when holding the valve stem O in a predetermined position,
Since the valve stem 0 is held by the screw action, the stator [phase]
There is no need to continuously energize the valve, and (2) the communication hole @ is provided, so the thrust required for switching the flow path is alleviated, and the required driving force is almost entirely between the valve shaft O, the bearing [Co., Ltd.], the male L9, and the screw. Passage■
(a) The simple structure makes it low cost, and (4) JIS seals are used for fluid seals.
It uses a simple metric screw with a processing accuracy of class 1, so there is no need to use auxiliary sealing materials such as packing or seal rings, and it also requires particularly high processing accuracy, so fluid resistance must be considered. There are almost no structural materials that are similar to YJ, and if the material of the valve stem is stainless steel and the material of the housing is brass, etc., the range of applicable fluids will be widened.
It has features such as being highly durable and therefore easy to guarantee quality.

Figures 4 and 5 show the implementation of the present invention, which is a structure and flow path switching valve for a four-way switching valve used for switching the refrigerant circuit of a heat pump type cooling cycle. , passage ■KFi Another pipe connection port is provided at the intermediate position 1 of the three three-way valve switching valve connection ports @O, and the valve stem 0 has a male threaded portion a, [with]' is [IiJ direction' connection port O.
There are two separated by a distance of .

This four-way switching valve Fi operates in the same way as the three-way switching valve of the Stephbing Tanabata drive system as shown in Figure 4.
Then, the fluid is the piping connection port [phase] - @ - [phase] -〇 - [phase]
The flow is as follows, and at the bottom of Fig. 5, the pipe connection port [phase] -〇-〇-
The order in which the fluid flows to the pipe connection port O@l can be reversed. Note that the arrows in Figures 4 and 6 indicate the flow of refrigerant, but 97! -Arrow FiJi
In the liIth part, the broken line arrow indicates a low pressure part, and parts with the same reference numerals as in FIG. 2 have the same functions.

As can be easily understood from the above explanation, the present invention is applicable not only to three-way switching but also to multi-directional switching such as two-way, four-way, etc. At this time, the valve stem 0) is faced to each other by the screw action, so that the fluid flow direction f! r! #No special effort is required to hold the W in the desired direction.

Since the housing rc has 4 through holes), the required force is 11 rugi type, which requires just a little more force than the frictional resistance of the bearing and threaded part, and the motor part It is composed only of the passage (9) with a threaded part [phase] and the valve stem 0 with a male threaded part, and the structure is very simple, so the structure is simple, inexpensive, highly reliable, and the general body ifI has a large enclosure. It has the features of 1Iiiil for industrial ladle use.
It is a great thing that value works.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of a cooling circuit, FIG. 2.1 is a vertical cross-sectional view of a three-way switching valve of the present invention, and FIG. 4.6 is a vertical cross-sectional view of a four-way switching valve of the present invention. ■=Bypass valve ■=Fan coil unit ■=Circulation pump ■=Heat exchanger 0=Water cooler ■=Valve body ■
= Motor part ■ = Housing ■ = Connection [Phase] =
Female thread part @0 God [stock] = Piping connection port 0 = Valve shaft [stock]
= Male thread (2) = Communication hole @ = 1st compartment = 2nd
Muro God = Rotor [Stock] = Shaft Retention = Seven-tahousing [Phase] = Stator Patent issuer Taiheiyo Kogyo Co., Ltd. No. 31" Figure 4 O 5 Prison procedure amendment (method) % formula % 1 Width making/front, j: Mochi 714 (#i 57-74134 2 BuC Ming, name of the devised horn/flow path switching valve: 3 Relationship between the person who wears the sleeve 1F and the outside) Special d'1, applicant for utility model registration 〒・(
(・111''i, 100 Kutoku-cho, Yagaki City, Gisu Prefecture (11
57111 July 911 (From It ji,'fJ
ll 57 (July 2711) 5 The drawing to be corrected will be clearly drawn using ahiro + EL. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A valve shaft O is fixed at the center of the rotor of the motor, and a threaded portion [with] is provided in a part of the valve shaft, and the threaded portion is axially penetrated into the valve body portion ■. Passage l with screw [phase] (also known as the passage ■0 Arrangement of two or more communicating ports I connection port (b) @
and a communication hole 0 for guiding fluid to the right end of the passage (2), rotatably fitting the male threaded part [phase] of the valve shaft O into the female threaded part [phase] of the passage (2), By applying current to the stator [phase] K of Seven-Yugure■, the nine-valve shaft 0, which is formed integrally with the rotor, is moved in the axial direction, and the male threaded part [phase] connects either one of the self-registered pipe connection ports. A flow path switching valve that switches the flow path by blocking the flow path.