KR100665350B1 - Directional selecting valve - Google Patents

Abstract

A directional change valve having a rotary spool is provided to reduce the friction resistance of fluid passing each port and the water hammer phenomenon by forming penetrations communicating each port into a straight line shape. A directional change valve having a rotary spool comprises a case having a connection port formed in parallel on one surface and the other surface; and a spool(30) rotatably installed in the case, formed with penetrations(34a,34b) of which inlet and outlet are corresponded to the connection port, and a communication unit mounted in parallel on the periphery, and installed to change the communication of the connection ports by rotating at predetermined degree. The communication unit is composed of a first ripple groove(32a) extending with predetermined depth from one surface of the part meeting at right angles to the inlet and the outlet of one penetration to the opposite surface of the part meeting at right angles to the inlet and the outlet of the other penetration, and a second ripple groove(32b) extending with predetermined depth from the opposite surface of the part meeting at right angles to the inlet and the outlet of one penetration to one surface of the part meeting at right angles to the inlet and the outlet of the other penetration.

Description

Spool Rotary Directional Valve {Directional selecting valve}

1 is a block diagram showing the concept of a general direction switching valve.

2a and 2b is a schematic view showing the concept of a rotary type direction switching valve.

3a and 3b is a schematic view showing a spool type directional valve concept.

Figure 4 is a perspective view of the spool rotary directional valve in accordance with the present invention.

5a and 5b is a perspective view showing a spool of the spool rotary directional valve according to the present invention.

6a and 6b are cross-sectional views showing the connection of each port in accordance with the rotation of the spool in FIG.

 7 is a perspective view showing a spool according to another embodiment of the present invention.

8a and 8b are cross-sectional views showing the connection of each port as the spool rotates.

<Description of the symbols for the main parts of the drawings>

20: spool rotational direction switching valve 22: case

24: Connection port 30,30-1: Spool

32a, 32b: corrugated groove 34a, 34b: through hole

32a-1,32b-1: Straight groove

The present invention relates to a spool rotary directional valve, and more particularly, a spool having low frictional resistance of a fluid to improve durability, a water hammer is alleviated, and a simple structure, thereby reducing cost and reducing productivity due to parts reduction. It relates to a rotary directional valve.

In general, in the case of a pneumatic device or a hydraulic device, air and fluid are sent to a pump and sent to a cylinder or a motor so that the operation is performed. To reverse the piston rod of the cylinder or reverse operation, both sides of the piston It is necessary to repeat the inflow and outflow of air and fluid at the.

As such, it is necessary to be able to freely flow air and fluid from the pump to the right or left side, and the role is the directional valve 10 shown in FIG.

The directional valve is divided into a rotary type that rotates the rotor around the shaft and a spool type that closes or opens an open port in the cylinder by sliding the shaft in a spool direction by inserting a failure shaped part called a spool into the cylinder.

2 and 3 are for illustrating the concept of the rotary type direction switching valve 10-1 and the spool type direction switching valve 10-2, and the rotary type direction switching valve 10-1 is 2; Although applied to a port or four port, there is a drawback that operation becomes difficult when the pressure oil from the pump becomes a high pressure. Recently, when a large capacity is required at a high pressure, the utilization thereof gradually decreases.

In addition, the spool type directional valve 10-2 is applied to all of two ports, three ports, and four ports, and is also used for a reduction valve.

However, the rotary type directional valve and the spool type directional valve as described above, the fluid flows in a curved shape in accordance with the change of direction, the friction resistance is large, water hammer (Water hammer) is large, of course, therein Due to the complexity of the flow path, the production is difficult, and the production processability is not good, such as manufacturing and assembling parts by part.

Therefore, the present invention has been devised in view of the above problems, and the friction resistance of the fluid is improved, durability is improved, water hammer is alleviated, as well as the structure is simple, the cost reduction and the improvement of the processing productivity due to parts reduction The purpose is to provide a spool rotary directional valve.

The present invention for achieving the above object, the connection port is formed side by side on any one side, and a case in which the connection port is formed side by side on the opposite side opposite; As the case is rotatably installed in the case, through-holes corresponding to the inlet and the outlet are formed in the connection ports, and communication means for converting the communication of the connection ports as they are rotated at an angle are parallel to the outer surface. Comprising a spool formed, the communication means, the opposite surface of the portion of the through-hole inlet and outlet from one side of the 90-degree angle from the other side of the portion to form a 90-degree angle from the inlet and outlet A first waveform groove extending to a predetermined depth and from one side of a portion that forms a 90-degree angle from the other through-hole inlet and outlet from an opposite surface of a portion that forms a 90-degree angle from the one through-hole inlet and outlet It is characterized in that the second waveform groove extending to a predetermined depth.

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In addition, the present invention is a case in which the connection port is formed side by side on one side, the connection port is formed side by side on the opposite side opposite; As the case is rotatably installed in the case, through-holes corresponding to the inlet and the outlet are formed in the connection ports, and communication means for converting the communication of the connection ports as they are rotated at an angle are parallel to the outer surface. It comprises a formed spool, wherein the communication means, from one side of the portion of the through-hole inlet and outlet 90 degrees to one side of the portion of the through-hole inlet and outlet 90 degrees And a first straight groove extending to a predetermined depth and a second straight groove formed to correspond to an opposite surface facing the first straight groove.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a perspective view of the directional valve according to the present invention, Figures 5a and 5b is a perspective view of the rotatable spool in Figure 4, Figures 6a and 6b is connected to each port in accordance with the rotation of the spool in Figure 4 It is sectional drawing shown.

As shown, through-hole port 24 is formed on both sides side by side on one side, the case 22 is formed on both sides of the opposing opposite side formed with side-by-side port 24, The case 22 is provided with a rotatable spool 30.

One side of the case 22 is opened for the spool 30 to be fitted, and the cover 23 for shielding the spool 30 in the fitted state is detached by the bolt 25. .

The spool 30 is preferably to be rotated by the drive of the motor according to the electrical control signal, but is not limited to the rotation method.

In the spool 30, first and second through holes 34a and 34b are formed in a straight line in the middle thereof.

That is, the through holes 34a and 34b are formed to correspond to the respective ports 24 having through-holes formed to face one surface of the case 22 and the opposite surface thereof, and the through holes 34a and 34b. When the inlet and the outlet of the shells coincide with the respective ports 24 of the case 22, the respective ports formed on opposite sides of each other communicate in a linear direction.

In other words, when the inlets of the through holes 34a and 34b of the spool 30 are in contact with each other, the P port and the R port formed on one surface of the case 22 are formed on the opposite side of the case 22. The ports A and B are in contact with the outlets of the through holes 34a and 34b of the spool 30 so that the P and A ports communicate with each other, and the R and B ports communicate with each other.

Therefore, the fluid flows between the P port and the A port, and the fluid flows freely between the R port and the B port.

At this time, the through holes 34a and 34b of the spool 30 are formed in a straight line. The fluid passing between the P port and the A port and between the R port and the B port flows in a straight line without any frictional resistance. This results in less load, significantly reduced water hammer and ultimately improved functionality of the fluid apparatus.

Meanwhile, an angle of about 90 degrees from an inlet and an outlet of the second through hole 34b along an outer surface is formed from one surface of a portion of the spool 30 that forms an angle of about 90 degrees from the inlet and the outlet of the first through hole 34a. A first waveform groove 32a of a predetermined depth is formed over the opposite surface portion.

In addition, an angle of about 90 degrees from the inlet and the outlet of the second through hole 34b along the outer surface from the opposite surface of the portion of the spool 30 that forms an angle of about 90 degrees from the inlet and the outlet of the first through hole 34a. The second waveform groove 32b of a predetermined depth is formed over one surface portion forming the surface.

Therefore, as shown in FIG. 6A, in the state where the inlet and the outlet of the first through hole 34a and the second through hole 34b of the spool coincide with the respective ports of the case 22, according to the electrical control signal. When the spool is rotated at an angle of 90 degrees, the front and rear ends of the first waveform groove 32a and the second waveform groove 32b coincide with the ports of the case 22.

At this time, when the front end of the first waveform groove 32a coincides with the P port of the case 22, the rear end thereof coincides with the port B of the case, and the front end of the second waveform groove 32b is When it matches with the R port, the rear end of the case 22 coincides with the A port of the case 22, so that they are in communication with each other.

Therefore, as shown in FIG. 6B, the B port located on the diagonal line between the P port and the R port and the A port communicate with each other, thereby changing the flow direction of the fluid.

That is, it is possible to change the flow direction of each fluid in accordance with the 90 degree angle rotation of the spool 30.

On the other hand, Figure 7 shows a spool according to another embodiment of the present invention, Figures 8a and 8b is a cross-sectional view showing the connection of each port as the spool rotates.

In the description of the present embodiment, the same parts as in the previous embodiment will be described with the same reference numerals, and repeated description thereof will be omitted.

In the present embodiment, the first and second portions of the spool 30-1 and the first through hole 34a-1 and the second through hole 34b-1 are formed at about 90 degrees with respect to the inlet and the outlet. A straight groove 32a-1 is formed, and a second straight groove 32b-1 is formed on the opposite surface opposite to the first straight groove 32a-1.

Therefore, when the P port and the A port of the case 22 are to communicate with each other, and the B port and the R port are to communicate with each other, as shown in FIG. 8A, the spool 30 is rotated by an electrical control signal to transmit the first through. The front and rear ends of the ball 34a-1 and the second through hole 34b-1 may be matched to the respective ports of the case 22, respectively.

Then, the P port and the A port communicate with each other through the first through hole 34a-1, and the B port and the R port communicate with each other through the second through hole 34b-1, so that the fluid flows in a straight direction without frictional resistance. It can be easily flowed.

Thus, the water hammer phenomenon due to the flow of the fluid is also significantly relieved to improve the function of the fluid device.

On the other hand, when the flow direction of the fluid is to be changed by changing the communication of each port, that is, when the P port and the B port are communicated, and the A and R ports are connected to the fluid flow direction, As shown in FIG. 8B, the spool 30 may be rotated at an angle of 90 degrees according to an electrical control signal.

Then, both ends of the first straight groove 32a-1 correspond to and communicate with the P port and the B port, respectively, and both ends of the second straight groove 32b-1 communicate with the A port and the R port, respectively. In other words, the flow direction of the fluid can be changed.

In this case, the first linear groove 32a-1 may be in communication with the A port and the R port according to the rotational direction of the spool 30, so that the second linear groove 32b-1 is connected with the P port. Of course, it can also be connected to the B port.

For reference, the present invention has been described as an example of a direction change valve for changing the direction of the fluid, but the spool rotary direction change valve according to the present invention, as well as the heat pump conversion valve in the refrigeration cycle, to all direction change valves Of course, it is possible to apply.

As described above, according to the spool rotary directional valve of the present invention, since the through-holes for communicating the ports are made in a straight line, the frictional resistance is reduced to the fluid passing through each port, which significantly reduces the water hammer phenomenon. In addition, the durability is improved, as well as the structure is very simple, there is a very useful effect that the production is easy and the manufacturing cost is reduced.

Claims (3)

A case in which connection ports are formed side by side on one side, and a connection port is formed side by side on the opposite opposite surface; As the case is rotatably installed in the case, through-holes corresponding to the inlet and the outlet are formed in the connection ports, and communication means for converting the communication of the connection ports as they are rotated at an angle are parallel to the outer surface. Including the formed spool, The communication means may be formed by extending a predetermined depth from one surface of a portion that forms a 90 degree angle from the one through-hole inlet and outlet to an opposite surface of the portion that forms a 90 degree angle from the other through-hole inlet and outlet. Corrugated groove, A second waveform groove extending at a predetermined depth from an opposite surface of a portion that forms a 90 degree angle from the one through hole inlet and an outlet to one surface of a portion that forms a 90 degree angle from the other through hole inlet and outlet; Spool rotary directional valve. delete A case in which connection ports are formed side by side on one side, and a connection port is formed side by side on the opposite opposite surface; As the case is rotatably installed in the case, through-holes corresponding to the inlet and the outlet are formed in the connection ports, and communication means for converting the communication of the connection ports as they are rotated at an angle are parallel to the outer surface. Including the formed spool, The communication means is a first straight line extending to a predetermined depth from one surface of the portion of the through-hole inlet and outlet at a 90 degree angle from one surface of the other through-hole inlet and outlet at a 90 degree angle And a second straight groove formed to correspond to the groove and the opposite surface opposite to the first straight groove.

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