KR101173207B1 - Flow path switch control device - Google Patents

Abstract

Disclosed herein are flow path control devices for use in control systems such as HVAC, cooling systems and the like. In the prior art, since the pressure at the top of the piston drops to the pressure at the outlet immediately at the moment the pilot valve is opened, a large pressure difference is formed between the upper and lower surfaces of the piston to drive the piston for movement. This results in a strong impact between the piston stop member and the piston. Therefore, the life of the product and the operational stability of the system will be affected. The flow path control device of the present invention includes a valve device and a pressure balancing control circuit arranged between the fluid inlet, the fluid outlet, the fluid inlet and the fluid outlet. In order to reduce the pressure change in the fluid passing through the pressure balancing control circuit when the flow path control device is opened / closed, an adjustment device is provided in the pressure balancing control circuit, which is provided during the opening and closing of the valve. Smoothness can be prevented, thus preventing the problem of strong vibration and noise generated at the moment when the solenoid valve is operated under a large pressure difference.

Description

Euro switch control device {FLOW PATH SWITCH CONTROL DEVICE}

The present invention is incorporated herein by reference on the basis of claim of priority, the Chinese patent application No.200910208966.3 filed on November 1, 2009 under the name "Flow Path Switch Control Device".

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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of fluid control, and more particularly, to switching devices in control systems such as HVAC (heating, ventilating, and air conditioning), cooling systems, and more, and more particularly to flow switching control suitable for high volume and high pressure environments. Relates to a device.

Solenoid switches are often used in temperature control and regulation systems such as HVAC, cooling systems, and the like. The basic principle of a solenoid switch is that the movement of the iron core up or down to open and close the solenoid valves in an air conditioning system is controlled by the current in which the pipeline system controls the on / off of the medium. It is controlled by the electromagnetic force generated by the coil. As an individual's housing area grows and buildings, such as shopping malls, increase, the demand for large-capacity air conditioning units increases. In such large capacity air conditioning units, it is required that the solenoid switch is also large capacity and must be large diameter. Conventional direct operated solenoid valves cannot meet such operating conditions because of the limited diameter of the valve. Usually, pilot operated solenoid valves are used in place of direct operated solenoid valves. However, since the pressure at the top of the piston drops to the pressure at the outlet immediately at the moment the pilot valve is opened, there is a large pressure difference between the upper and lower surfaces of the piston to drive the piston for movement. Which results in a strong impact between the piston stopping member and the piston. The impact is stronger at valves with large pressure differentials and large valve diameters. Therefore, there is a problem that the start up of the large-capacity pilot solenoid valve in the prior art is not stable.

Thus, a large diameter pilot solenoid switch is disclosed in Applicant's Chinese patent CN2753926Y published on January 25, 2006. Referring to FIG. 4, the solenoid switch includes a coil 1 and a main valve 7 connected to the upper and lower portions of the sleeve 3, respectively. The plug 2 is arranged in the sleeve 3. Two valve ports are provided in the main valve 7, namely the pilot valve port 8 and the main valve port 14 in communication with the pilot valve port 8. A pilot valve chamber 16, a plug 2, a spring 5 and an iron core 4 surrounded by the sleeve 3 are formed above the pilot valve port 8. Steel balls 6 are arranged on the iron core 4. The main valve chamber 13 is formed close to the main valve port 14. The piston 10 is provided in the main valve chamber 13. The piston 10 is fitted with an end cover 11 fixed to the end of the main valve. The return spring 12 is provided between the piston 10 and the end cover 11. The axes of the piston 10 and the iron core 4 are perpendicular to each other. A sealing plug 9 made of a polymer material is provided on the piston 10. The surface of the sealing plug on the main valve port side is a flat surface. The main valve chamber 13 and the pilot valve chamber 16 communicate with each other via through holes 15. There is no boss inside the piston 10. The boss is provided on the end cover 11.

In the above solenoid valve setting, a boss is provided on the end cover 11 or inside the piston 10 to prevent direct impact between the piston 10 and the end surface of the end cover 11. However, since the pressure difference on the opposite side of the piston 10 changes immediately at the moment of activation of the valve, such a setting cannot solve the shock problem thoroughly, which affects the valve life and the operational stability of the system.

The technical problem to be solved by the present invention is to control and monitor the pressure change in the fluid passing through the valve device by improving the setting of a conventional large diameter solenoid switch in a cooling system. More specifically, while opening the valve, the fluid flow region in the pressure balancing control circuit increases slowly as the pressure difference between the opposite sides of the valve body gradually increases. Therefore, the opening of the valve is smooth without strong shocks and vibrations, thus preventing the problems of strong vibrations and noises occurring at the moment when the solenoid valve is operated under high pressure difference. For this purpose, the present invention provides a flow path switch control device.

The flow switch control device includes a fluid inlet, a fluid outlet, a valve device and a pressure balancing control circuit arranged between the fluid inlet and the fluid outlet, the pressure when the flow switch control device is opened / closed The adjusting device is provided in the pressure balancing control circuit to reduce the pressure change in the fluid passing through the balancing control circuit.

More specifically, the regulating device reduces the pressure change in the fluid in the circuit by changing the flow region of the fluid.

More specifically, the adjusting device of the flow path switch control device is driven by the pulse signal.

Furthermore, pressure balancing holes are further provided in the pressure balancing control circuit. It may be two or more pressure balancing holes. Moreover, the flow path control device also includes a casing which houses the valve device and the adjustment device. A connecting passage through which the valve device communicates with the adjustment device is provided in the casing.

Moreover, the valve device and the adjusting device pass through the connecting pipe.

The flow path control device of the present invention is provided with an adjustment device in the pressure balancing control circuit. The regulating device is activated and driven by an external pulse signal to change the flow area of the fluid in the pressure balancing control circuit and to gradually release the fluid pressure in the pressure balancing control circuit. The flow path switch control device closes the flow path in the completely closed area. The flow switch control device gradually increases the flow rate to allow the main valve to open or slowly decreases to close the main valve in the flow change region. The flow path control device maintains a stable opening of the main valve in the fully open area. In this way, it is soft during the opening and closing of the valve, thus preventing the problem of strong vibration and noise occurring at the moment when the solenoid valve is operated under a large pressure difference.

1 is a detailed structural diagram of a preferred flow switch control device according to the present invention;
2 is a detailed structural diagram of another preferred flow switch control device according to the present invention;
3 is a circuit diagram of a valve opening feature in a flow path using the flow path switch control device above; And
4 is a structural diagram of a typical flow path switch control device in the prior art.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the opening process of the flow path control device will be described in detail with reference to the drawings and embodiments below.

1 is a structural diagram of a specific flow path switch control apparatus according to the present invention.

As shown in FIG. 1, the flow path switch control device 100 includes a casing 106 formed entirely of a metallic material. The valve device 103 and the adjusting device 105 are sealedly mounted on the casing 106. An inlet chamber 111 and an outlet chamber 121 are formed in the casing 106. An inlet connecting pipe 112 communicates with the inlet chamber 111 by seal welding, and an outlet connecting pipe 122 communicates with the discharge chamber 121 by seal welding. In this way, a main valve circuit is formed in which the fluid inlet 101, the suction chamber 111, the valve arrangement 103, the outlet chamber 121, and the fluid outlet 102 are in turn constituted. The pressure balancing control circuit 104 is provided in the flow path switch control device 100. The regulating device 105 is arranged in the control circuit to adjust and reduce the pressure change as the fluid passes through the pressure balancing control circuit 104 by the change in the flow region of the fluid.

The valve device 103 is arranged entirely in the first receiving chamber 161 of the casing 106. The valve device 103 mainly includes a valve body 131 and a support member 132. The valve body 131 is slidable within the first accommodating chamber 161 and divides the balancing chamber 137 closed from the first accommodating chamber 161. The support member 132 is welded on the casing 16 and seals the first receiving chamber 161. The first receiving chamber 161 communicates with the suction chamber 111 via a pressure balancing hole 134 mechanized in the valve body 131. The balancing hole has a diameter in the range from 0.3 to 1.5 mm, preferably from 0.5 to 1 mm. The inner cross sectional area of the balancing hole 134 may be set to the flow area S3 of the balancing hole 134. In this embodiment, only one balancing hole 134 is mechanized in the valve body 131. Certainly, the balancing hole 134 can also be symmetrically mechanized in the valve body 131. The seal member 135 made of a nonmetal material is mounted to the leading end of the valve body 131. The spring 133 is arranged between the valve body 131 and the support member 132 to drive the seal member 135 of the valve body 131 with respect to the first valve port 163 of the casing 106. The flow path area of the fluid flowing between the seal member 135 of the valve body 131 and the first valve port 163 of the casing 106 may be set to S1. The flow path between the suction chamber 111 and the discharge chamber 121 is blocked when the seal member 135 seals the first valve port 163.

The adjusting device 105 is mounted in the second receiving chamber 162 of the casing 106 by seal welding. The adjusting device 105 mainly comprises an adjusting rod 151, a magnetic rotor 152, a coil 153 and a signal lead wire 107. The adjusting rod 151 is coupled with the magnetic rotor 152 by a transmission pair of nuts 154 and screw rods 155. The adjusting rod 151 extends deep into the second receiving chamber 162. Accordingly, the pressure balancing control circuit 104 composed of the first accommodating chamber 161, the pressure balancing hole 134, the balancing chamber 137, the connection passage 141, and the second accommodating chamber 162 includes a valve body ( Between the 103 and the adjusting device 105. The flow path area of the fluid flowing between the adjusting rod 151 and the second valve port 164 may be set to the flow path area S2 of the pressure balancing control circuit 104.

When a certain amount of pulse signal is input from the signal lead wire 107. The magnetic rotor 152 is rotated at a certain angle under the action of the coil 153. Then driven by a transmission pair of nuts 154 and screw rods 155, the adjustment rod 151 changes the flow path area S2 of the pressure balancing control circuit 104 and thus changes the pressure change in the fluid. To control, it moves upwards or downwards by a particular variation in the second receiving chamber 162.

The valve opening features in the flow path of the flow path switch control device above are shown in FIG. 3. Assume that the pressure in the suction chamber 111 is F1, the pressure in the balancing chamber 137 chamber is F2, the pressure in the spring 133 adjacent to the valve body 131 is F3, and ΔF = F1-F2. .

When the flow path control device 100 is in the closed state (A0 position), the pressure balancing control circuit 104 is closed, and the suction chamber 111 and the balancing chamber 137 are in a pressure balanced state. That is, ΔF = F1-F2 = 0, and the valve body 131 is adjacent to the first valve port 163 under the force of the spring 133.

When the flow path control device is started from the closed state by inputting a certain amount of pulse signal, the adjusting device 151 moves slowly away from the second valve port 164 of the casing 106 and thus the pressure balancing control circuit ( The flow path area S2 of 104 increases gradually. When this process proceeds to the A1 position, S2 is equal to the flow path area S3 of the pressure balancing hole 134. After S2> S3, the pressure F2 in the pressure balancing control circuit 104 begins to decrease (i.e., F1> F2), so that a pressure difference occurs between the suction chamber 111 and the balancing chamber 137. If this process proceeds to the A2 position, then F1 = F2 + F3. After F1> F2 + F3, the valve body 131 begins to move away from the first valve port 163 so that the valve device 131 opens until it is fully open in a stable state (ie, A3 state). . Thereafter, the flow rate of the valve device becomes stable (ie, A4 state). The valve opening process described above proceeds smoothly. Therefore, the valve body 131 can move suddenly or protect the support member 132 from impact.

2 is a structural diagram of another specific flow path switch control device according to the present invention.

As shown in FIG. 2, the flow path control device 100 ′ is different from the first embodiment, and includes a valve device housing 136 formed entirely of a metallic material. An inlet chamber 111 and an outlet chamber 121 are formed in the valve device housing 136. An inlet connecting pipe 112 communicates with the inlet chamber 111 by seal welding, and an outlet connecting pipe 122 communicates with the discharge chamber 121 by seal welding. In this way, a main valve circuit is formed in which the fluid inlet 101, the suction chamber 111, the valve arrangement 103, the outlet chamber 121, and the fluid outlet 102 are in turn constituted. The pressure balancing control circuit 104 is provided in the flow path switch control device 100 ′. The regulating device 105 is arranged in the control circuit so that the fluid adjusts and reduces the pressure change through the pressure balancing control circuit 104 by the change in the flow region of the fluid.

The valve device 103 is arranged entirely in the first receiving chamber 161 of the valve device housing 136. The valve device 103 mainly includes a valve body 131 and a support member 132. The valve body 131 is slidable within the first accommodating chamber 161 and divides the balancing chamber 137 closed from the first accommodating chamber 161. The support member 132 is welded onto the valve device housing 136 and seals the first receiving chamber 161. The first receiving chamber 161 communicates with the suction chamber 111 via a pressure balancing hole 134 mechanized in the valve body 131. The seal member 135 is mounted to the leading end of the valve body 131. The spring 133 seals 135 of the valve body 131 with respect to the first valve port 163 of the valve device housing 136 to block the flow path between the suction chamber 111 and the discharge chamber 121. It is arranged between the valve body 131 and the support member 132 for urging the pressure.

The adjusting device 105 is connected to the valve device housing 136 and the outlet pipe 122, respectively, via connecting pipes 108, 109. The adjusting device 105 mainly includes an adjusting rod 151, a magnetic rotor 152, a coil 153, and a signal lead wire 107. The adjusting rod 151 is coupled with the magnetic rotor 152 by a transmission pair of nuts 154 and screw rod 155. The adjusting rod 151 extends deep into the second receiving chamber 162. When a certain amount of pulse signal is input from the signal lead wire 107. The magnetic rotor 152 is rotated at a certain angle under the action of the coil 153. It is then driven by the transmission pair of nut 154 and screw rod 155, which transfer rod 151 in the fluid by varying the flow passage area in pressure balancing control device 104 as described by regulating rod 151. Move upwards or downwards by certain variations in the second receiving chamber 162, such as in cooperation with the second valve port 164 to control the pressure change.

The valve opening features in the flow path of the flow path switch control device above are actually the same as that of the first embodiment and will not be repeated here.

The above description is only intended to further explain the technical solution of the present invention, in which specific embodiments, functions, and resulting effects during the opening process of the flow path control device are described in detail. Similarly, with this configuration, the same function and effect will also be achieved during the closing process of the flow path switch control device. Some modifications and variations can be made by those skilled in the art without departing from the spirit of the invention. It should be noted that such variations and modifications are also within the protection scope of the present invention.

1: coil
2: plug
3: sleeve
4: iron core
5: spring
6: steel ball
7: main valve
8: pilot valve port
9: sealing plug
10: piston
11: end cover
12: return cover
13: main valve chamber
14: main valve port
15: through hole
16: pilot valve chamber
100, 100 ': Euro switch control unit
101: fluid inlet
102: fluid outlet
103: valve device
105: adjusting device
106 casing
107: signal lead wires
108,109: connecting pipe
111: suction chamber
112: inlet connection pipe
121: discharge chamber
122: outlet connection pipe
131: Valve Body
132 support member
133: spring
134: pressure balancing hole
135: thread member
136: Valve Unit Housing
137: balancing chamber
141: connecting passage
151: adjustment rod
152: magnetic rotor
153: coil
154 nuts
155 screw rod
156: adjuster housing
161: first receiving chamber
162: second receiving chamber
163: first valve port
164: second valve port

Claims (10)

A fluid inlet 101, a fluid outlet 102, a valve arrangement 103 arranged between the fluid inlet 101 and the fluid outlet 102, a pressure balancing control circuit 104 and a casing 106. ,
The valve device 103 includes a valve body 131 and a support member 132, and is disposed in the first receiving chamber 161 of the casing 106,
The valve body 131 is slidable in the first accommodating chamber 161 and divides the balancing chamber 137 closed from the first accommodating chamber 161.
An adjusting device 105 is provided in the second receiving chamber 162 of the casing 106,
The pressure balancing control circuit 104 is formed between the first accommodating chamber 161 and the second accommodating chamber 162,
The adjustment device (105) is provided to reduce the pressure change of the fluid passing through the pressure balancing control circuit (104) when the flow switch control device is opened / closed.
The method of claim 1,
And said regulating device (105) reduces the pressure change in the fluid in said pressure balancing control circuit (104) by varying the flow region of the fluid in said flow path.
The method of claim 1,
The adjustment device (105) is driven by a pulse signal.
The method of claim 2,
And a pressure balancing hole (134) is provided in said pressure balancing control circuit (104).
The method of claim 4, wherein
2 or more of the pressure balancing holes (134) are provided.
The method of claim 4, wherein
The pressure balancing hole (134) is a flow switch control device, characterized in that having a diameter in the range of 0.5 to 1.0mm.
The method according to claim 6,
The pressure balancing hole (134) is a flow switch control device, characterized in that having a diameter in the range of 0.5 to 1.0mm.
The method according to any one of claims 1 to 7,
A flow path control device, characterized in that a connection passage (141) for connecting the valve device (103) with the adjustment device (105) is provided in the casing (106).
8. The method according to any one of claims 2 to 7,
The valve device (103) and the regulating device (105) are connected via a connecting pipe (108). delete

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