JPS58221078A - Pressure operated valve - Google Patents

Abstract

PURPOSE:To perform stable pressure operation, by a snap function in which a diaphragm laminated member is allowed to close or open a flow of fluid instantaneously when pressure reaches a preset level. CONSTITUTION:If a pressure of fluid in the side of a valve chamber 2 is increased higher than the pressure of fluid in a pressure chamber 3 to reach a level above the elasticity provided to a diaphragm laminated member having a preset snap function, said diaphragm laminated member is instantaneously inverted to the internal surface of a flange 13. Accordingly, a spherical valve body 4 provided to the center part of a diaphrabm 5 is detached from a concaved valve seat face 8, in consequence fluid flows from an outflow bypass passage 15 to an outflow pipe 11, and stable pressrue operation can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure-operated valve, and more particularly to a pressure-operated valve for controlling a fluid by opening and closing a flow path when a set pressure is reached using a pressure difference in the fluid. be.

Conventionally, to control the opening and closing of these fluids, a solenoid valve was used, or a bellows-type sensing part was used, and a valve seat and a valve body were provided.
The valve consists of a spring, etc. that biases the convexity, and a special means is provided to switch the force difference △PX, the bellows pressure receiving area S, and the setting elasticity of the adjustment spring force F, so that the valve lift is linear K.
f, and as a result, the flow rate characteristics also became similar, making it impossible to open and close the fluid instantly with a good response at the set pressure, especially in refrigerant control of air conditioners, etc. There is a strong demand for the development of an energy-saving operating valve that is compact, has high performance (responsiveness), and does not use electricity, and eliminates the above-mentioned problems.

In view of the demands of the times, the present invention does not require complicated structures such as springs and bellows, and instantly when the pressure difference between the fluid pressure and atmospheric pressure or the return side pressure of the compressor (hereinafter referred to as the set pressure difference) is reached. It is an object of the present invention to provide a pressure-operated valve which is designed to open and close a fluid flow path, has an extremely simple structure, is inexpensive, and has high quality.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a pressure-operated valve according to the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of the present invention. Figure 1 shows a so-called normally closed pressure-operated valve that normally closes the flow passage and instantly releases the flow passage when a set pressure difference is reached.The valve body consisting of the valve casing [phase] and flange 0 snaps together. It is divided into a valve chamber (■) and a pressure chamber (■) by a metal diaphragm (■) that has operating functions.

The metal diaphragm ■ is press-molded in a concave shape on the lower surface of the center, and when it surrounds a part of the spherical valve body ■, it is curved as a whole to give it a snap action characteristic. ■The reversal can be easily performed. Incidentally, it is convenient to make the diaphragm have a predetermined snap characteristic by laminating a large number of thin stainless steel plates.

The spherical valve element (2) is made of a steel ball with excellent corrosion resistance and abrasion resistance, and is inserted into a concave portion provided on the lower surface of the center of the diaphragm (2) and connected by resistance welding or the like.

The valve seat (■), which is located below the spherical valve body (■), has an outflow passage (■) in its center, a recessed valve seat surface (■) in its upper part, and a concave valve seat (■) in the lower part of the outflow passage (■). Outflow pipe■
An outflow detour 0 is formed which communicates with the.

The valve casing [phase] is press-formed into a cylindrical shape so that it can surround the valve seat (1) below, and holes are provided so that the inflow pipe [phase] and the outflow pipe (2) can be press-fitted therein. A valve seat (2), an inflow pipe [phase], and an outflow pipe (2) are each fixed to the casing 0 by brazing.

Further, a pressure introduction pipe [phase] for connecting the pressure chamber (1) to the atmosphere or to the return side circuit of the compressor is fixed to the flange 0 with brazing. In this way, the valve body (2) is uniformly welded over the entire circumference, including the flange 0, the diaphragm (2), and the outer circumference K of the valve casing O.

Next, the operating state when the pressure-operated valve of the present invention is used in a refrigeration circuit will be explained using the circuit diagram of the refrigeration cycle in Fig. 8. 0 indicates the compressor, and the pipe line from the discharge high pressure side @ It passes through the condenser [phase], connects to the pressure-operated valve ■ (inflow pipe [phase] - outflow pipe @) of the present invention, the cavity free tube [phase] and the evaporator [phase], and connects it to the I! The check valve 0 is connected to the suction low pressure side [phase] of the compressor [phase] via the pipe @ from the pipe 0. Further, the pressure introduction pipe [phase] provided in the pressure-operated valve of the present invention is connected to the low pressure side of the pipe line @.

Therefore, when compressor 0 operates and the pressure difference between the inflow pipe [phase] and the pressure introduction pipe [phase] led from the low pressure side pipe [phase] reaches the valve opening setting pressure, the pressure operated valve (■) of the present invention operates, The flow path is opened, the cavity free tube [phase] and the refrigerant flow, and a constant refrigeration cycle is started. However, when the indoor temperature reaches a certain level, the compressor [phase]
When the pressure on the discharge high-pressure side O begins to decrease, the busy check valve 0 is activated at the same time, and the pressure in the pipeline [phase] increases, and the pressure in the inflow pipe [phase] of the pressure-operated valve ■ of the present invention increases. and pressure inlet pipe [
When the differential pressure between [phase] reaches the valve closing set pressure, the pressure-operated valve ■ is closed, check valve 0, pipe [phase], compressor [phase], pipe [phase], and condenser. Each [phase] pressure is balanced at a constant set pressure.゛Then, when the indoor temperature rises and the thermo switch is turned on, the compressor [phase] operates, the pressure on the high-pressure piping side of the pipeline [stock] increases, and the pressure on the low-pressure side of the pipeline [phase] begins to decrease again. When the differential pressure reaches the valve-opening set pressure, the pressure-operated valve (2) of the present invention is opened, and the refrigeration cycle enters a normal operating state.

In other words, when restarting, the compressor [phase] pressure can be set at a certain high pressure state and then the operating sequence can be started, making it possible to operate the refrigeration cycle efficiently.

Next, the operation of the normally closed type pressure operated valve according to the present invention will be explained.

When the fluid pressure on the valve chamber ■ side becomes higher than the fluid pressure in the pressure chamber ■ and exceeds the elasticity of the diaphragm laminated body with the set snap function, the diaphragm laminated body with the set snap function will close to the inner surface of the flange 0. Therefore, the spherical valve body ■ installed at the center of the diaphragm ■ separates from the recessed valve seat surface ■ formed on the upper surface of the flow path ■, so the fluid passes through the flow path ■ and exits from the outflow detour qΦ. K flows into the outflow pipe 0.

At this time, the laminated body of the diaphragm ■ is reversed until it comes into contact with the inner surface of the flange O, but this reversal rate is less than a complete reversal. ■It is set to snap to the side.

In addition, the set pressure of jin can be adjusted by changing the number of thin plate diaphragms ■.

Conversely, when the fluid pressure on the valve chamber (2) side decreases and reaches the set pressure, the stacked body of the diaphragm (2) is reversed again by the snap function and returns to its original state (DK). The spherical valve body (2) closes the recessed valve seat surface (2) formed on the upper surface of the flow path (2) and instantly stops the flow of fluid.

Next, the one shown in Figure 2 has a flow path open all the time.
This is a so-called normally-closed pressure-operated valve that instantly closes the flow path when the set pressure difference is reached.The main components are exactly the same as the normally-closed pressure-operated valve, but the curved shape of the stacked body of the diaphragm■ with a snap function is Compared to a normally closed pressure-operated valve, it is reversed, and the spherical valve body ■ installed in the center of the diaphragm ■ is assembled so that the four-part valve seat surface ■ formed on the top surface of the valve seat ■ is always open. It is being

Therefore, when the fluid pressure on the pressure chamber ■ side reaches a set pressure higher than the fluid pressure on the valve chamber ■ side, the stacked body of the diaphragm ■ is reversed by the snap function.

The spherical valve body ■ closed the recessed valve seat surface ■ formed on the upper surface of the flow path ■, and flowed from the inflow pipe [phase] through the valve chamber ■, from the flow path ■ to the outflow detour 0, and the outflow pipe ■. Stops fluid instantly. Conversely, the fluid pressure on the valve chamber ■ side.

When the fluid pressure becomes higher than the fluid pressure in the pressure chamber (2) and reaches the set pressure, the stacked body of the diaphragm (2) is reversed again by the snap function and returns to its original state, opening the flow path (2) and allowing fluid to flow. The relationship between these fluid pressures and flow rates is shown in Figures 4 and 6. Figure 4 shows the relationship between the differential pressure △ in a normally closed pressure operated valve.
This is a diagram showing the relationship between P (valve chamber pressure - pressure chamber pressure) and flow fjkQ. In other words, when the differential pressure △P approaches the valve opening setting pressure, the fluid of 1 starts flowing at the 21 points immediately before it, and P,
When the point is reached, the laminated body of the diaphragm (2) is reversed by the snap function and the flow path (2) is fully opened, so the flow rate increases instantly and reaches the 28 point. Further, when the differential pressure ΔP decreases and reaches the 24th point, the stack of diaphragms (2) is reversed again and the flow passage (2) is blocked, so that the flow rate is instantaneously stopped. Figure 5 shows the relationship between differential pressure △P (pressure chamber pressure Kerr valve chamber pressure) and flow rate Q in a normally closed pressure-operated valve, and has completely opposite characteristics to the case shown in Figure 4 above. It is something.

As mentioned above, the pressure-operated valve according to the present invention has a very simple structure and has a diaphragm stack with a snap function that instantly closes or opens the fluid flow when the set pressure is reached, resulting in stable and high quality. This product is of high practical value and meets the demands of the times for energy saving, provided at a low price.

[Brief explanation of drawings]

Figures 1 and 2 are longitudinal side views showing each embodiment of the pressure-operated valve according to the present invention, Figure 8 is a circuit diagram of a refrigeration cycle, and Figures 4 and 6 represent the relationship between operating pressure and flow rate. In the graphs, FIG. 4 shows the characteristics of a normally closed type pressure operated valve, and FIG. 5 shows the characteristics of a normally pot type pressure operated valve. ■・・・Valve body ■・・Valve chamber ■・・Pressure chamber ■・・Spherical valve body ■・・Diaphragm ■・・・・
Valve seat ■...Flow path ■...-Recessed valve seat surface 0.
-Inflow pipe■・-i Small pipe 0・-Valve casing 0・-
Flange [Phase]...Pressure introduction pipe [Phase]...Detour for outflow Patent applicant: Taiheiyo Kogyo Co., Ltd.

Claims (1)

[Claims] l) Valve chamber ■ and pressure chamber ■ are partitioned by a metal diaphragm ■ having a snap-action function inside the valve body ■ consisting of a valve casing O and seven flange [phases], and the diaphragm ■ A spherical valve body ■ is welded and fixed to the lower surface of the center of the
On the side of the valve chamber (■), a valve seat (■) formed with a concave valve seat surface (■), a flow path (■), and an outflow detour 0 is provided so as to be located below the spherical valve body (■), ■ and outflow bypass [phase]
Each side has an inflow pipe [phase] and an outflow pipe ■, while the pressure chamber ■ side has a pressure introduction pipe [phase] that is open to the atmosphere or connected to a compressor bypass circuit, etc.
A pressure-operated valve characterized in that the valve is operated by the pressure difference between the pressure chamber (1) and the h-chamber (2). 2) The pressure-operated valve according to claim 1, wherein the diaphragm (2) is a laminate of thin stainless steel plates.