JPH04106582U - Filter and control valve using it - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of filter parts, simplify manufacturing, reduce manufacturing costs, and simplify installation work. [Structure] A bottomed cylindrical filter consisting of a drop-preventing ring part 1A coaxially press-fitted into a pilot exhaust port 4 of a control valve 2 and a breathable bottom part 1B for the filter. The air permeable bottom portion 1B is integrated by integral resin molding.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a filter and a control valve using the filter, and particularly to a pilot type method. Effective when applied to the filter installed on the directional control valve and this pilot exhaust port. related to technology.

0002

[Conventional technology]

For example, pilot-type directional control valves are known as control valves; For directional control valves such as A filter may be provided at the lot exhaust port.

0003 This filter is a drop-off prevention ring that is coaxially press-fitted into the pilot exhaust port. It consists of a ring part and a breathable bottom part for the filter, and the former ring part is made of aluminum. The breathable bottom of the latter is made of rubber and manufactured by cutting. It is made of stainless steel and is manufactured into a net shape by press punching.

0004 Therefore, this filter has two parts, a ring part and a breathable bottom part, which are separate from each other. It is said that the structure consists of

[0005]

[Problem that the idea aims to solve]

By the way, conventional filters of this type have separate ring parts and ventilation parts, as mentioned above. Since the structure consists of two parts, the bottom part and the bottom part, the number of parts increases and the manufacturing cost is reduced. This has hindered the reduction of costs.

[0006] Also, when installing the filter into the pilot exhaust port, the ventilated bottom After this work, insert the ring part into the exhaust port. It requires press-fitting and holding by mechanical or equipment means. Ease of installation into the control valve is hindered.

[0007] The purpose of this invention is to reduce the number of parts, facilitate manufacturing, reduce manufacturing costs, and A filter that can facilitate loading work, and a control valve using the filter Our goal is to provide the following.

[0008] The foregoing and other objects and novel features of the present invention are detailed in the description and appendices of this specification. This will become clear from the accompanying drawings.

[0009]

[Means to solve the problem]

Among the devices disclosed in this application, a brief overview of typical ones is as follows. ,It is as follows.

0010 In other words, the structure of the filter of the present invention is that the filter is coaxial with the pilot exhaust port of the control valve. It consists of a ring part that is press-fitted to prevent it from falling off, and a breathable bottom part for the filter. The filter has a cylindrical bottom shape, and the ring portion and the breathable bottom portion are integrally molded with resin. Therefore, it has an integrated structure.

[0011] In this case, the ring portion is separated by a slit extending along its axial direction. The structure can be such that it is split and an elastic deformation force is applied in the radial direction.

0012 In addition, the structure of the control valve of the present invention is such that the filter having the above structure is connected to the pilot exhaust port. This is a structure that is installed at the seat.

[0013]

[Effect]

According to the filter of the present invention having the structure described above, the ring part and the breathable bottom part are made of resin. Because they are integrated by body molding, the ring part and the breathable bottom part are separate parts. Compared to conventional filter structures, the number of parts is reduced, manufacturing is easier, and manufacturing costs are reduced. This makes it easier to integrate into control valves, and also allows for easier installation of various product types. It is possible to change colors by different colors and facilitate parts management.

[0014] In this case, the ring portion is separated by a slit extending along its axial direction. If the structure is split and subjected to elastic deformation force in the radial direction, the elastic deformation force This makes it easier to press fit into the pilot exhaust port during assembly and makes it easier to press fit into the pilot exhaust port after press fit. It is possible to ensure that the gas is held in the exhaust port.

[0015] Further, according to the control valve having the above-described structure, the filter having the above-described structure is used as a pilot valve. Since it is provided at the exhaust port, it is possible to obtain the above-mentioned effects of the filter. I can do that.

[0016]

【Example】

Figure 1 is a plan view showing a filter that is an embodiment of the present invention, and Figure 2 is a plan view of the filter. Cross-sectional view, Figure 3 is a cross-sectional view showing the filter installed in the pilot valve part. , FIG. 4 is a sectional view showing a control valve using the filter.

[0017] The filter 1 of this embodiment is applied to a pilot-type directional control valve 2 operated by electromagnetic operation. As shown in Figures 3 and 4, the pilot exhaust of the block-shaped pilot valve part 3 is Built into port 4.

[0018] The filter 1 is a drop-preventing lip that is coaxially press-fitted into the pilot exhaust port 4. It is formed into a bottomed cylindrical shape consisting of a cooling part 1A and a breathable bottom part 1B for filtering. The ring portion 1A and the breathable bottom portion 1B are integrated by integral resin molding.

[0019] As shown in FIGS. 1 and 2, the ring portion 1A has a plurality of rings extending along its axial direction. It is divided by slit 1C and elastic deformation force is applied in the radial direction, and the elastic deformation force is applied to the Due to its shape, it is easier to press fit into the pilot exhaust port 4 during assembly. This is intended to improve the holding force for the pilot exhaust port 4 later.

[0020] In addition, the breathable bottom part 1B is formed in a mesh shape such as a square or a circle, and serves as a filter. All functionality has been planned.

[0021] In the filter 1 having such a structure, the ring portion 1A resists the elastic deformation force. is reduced in diameter and coaxially pushed into the pilot exhaust port 4, and then the pilot The breathable bottom part 1B faces the step part 4A of the exhaust port 4, and the ring part 1A It is expanded due to the deformation force and is pressed against the inner wall surface of the pilot exhaust port 4 and incorporated. It is rare.

[0022] On the other hand, the directional control valve 2 includes an end cover 5, a valve body part 6, and a pilot valve part 3. and the solenoid section 7 are coaxially connected.

[0023] An input port 8, a discharge port 9, and an output port 10 are provided on the outer peripheral surface of the valve body 6. Many have been established.

[0024] A shaft hole 11 is formed in the valve body 6 along its axial direction, and the inside of this shaft hole 11 is Valve seats 12 and 13 are provided around the circumferential surface at a predetermined interval along the axial direction. Ru.

[0025] A main shaft 14 is provided in the shaft hole 11 so as to be freely displaceable along the axial direction. 14 has large diameter portions 14A and 14B that approach and separate from the valve seats 12 and 13, respectively, located in the axial direction. They are formed at regular intervals.

[0026] Pistons 15 and 16 are in contact with both end surfaces of the main shaft 14, respectively. The cylinders 15 and 16 are the working fluid chamber 17 in the end cover 5 and the working fluid chamber 17 in the pilot valve part 3. They are accommodated in the dynamic fluid chamber 18 so as to be freely displaceable along their respective axial directions.

[0027] The piston 15 has a smaller pressure receiving area than the piston 16. The right side fluid chamber 17A of the working fluid chamber 17 partitioned by the It communicates with the outside through pores.

[0028] On the other hand, the left side fluid chamber 18A of the working fluid chamber 18 partitioned by the piston 16 is communicated with the outside through the flow path 19 and the pilot exhaust port 4.

[0029] Further, the right side fluid chamber 18B of the working fluid chamber 18 is connected to the flow path 20 and the pilot exhaust port. The flow path 20 is connected to the flapper 21 in the right fluid chamber 18B. It is designed to be opened and closed by. Note that the flapper 21 has a spring 22 is biased toward the right side in FIG.

[0030] A pilot chamber 23 is provided at the joint portion between the pilot valve portion 3 and the solenoid portion 7. is formed, and the pilot chamber 23 and the right fluid chamber 18B have a through hole between them. They are communicated through holes 24.

[0031] Further, the pilot chamber 23 communicates with the input port 8 via the pilot flow path 25. Similarly, the left side fluid chamber 17B of the working fluid chamber 17 is also connected to the pilot flow path 2. 5 to an input port 8.

[0032] Furthermore, a plunger 26 is disposed in the pilot chamber 23 and is displaceable along its axial direction. is inserted into the plunger 26, and the pilot valve body embedded in the left end face of the plunger 26 The pilot flow path 25 is opened and closed.

[0033] The plunger 26 is biased toward the left side in FIG. 4 by a plunger spring 27. There is.

[0034] Further, the plunger 26 is inserted through a plunger pin 28 passing through the through hole 24. and is linked to the flapper 21.

[0035] The solenoid section 7 includes a coil 29A wound around a bobbin 29, and a coil 29A wound around a bobbin 29. The fixed core 30 is inserted halfway into the hole and fixed.

[0036] In such a structure, when demagnetizing the coil 29A, as shown in FIG. uni, the plunger 26 is transferred from the fixed core 30 to the biasing force of the plunger spring 27. Therefore, they are separated and the pilot flow path 25 is closed, and on the other hand, the plunger pin 28 is When the flapper 21 is pushed away and the flow path 20 is opened, the right fluid chamber 1 The fluid pressure in 8B is exhausted to the outside through the flow path 20 and the pilot exhaust port 4. . Then, the increased fluid pressure in the left fluid chamber 17B acts on the piston 15. As a result, the main shaft 14 is displaced to the right in the figure.

[0037] On the other hand, when the coil 29A is energized, the plunger 26 is activated by its plunger spring. The pilot is attracted to the fixed core 30 side against the biasing force of the pin 27. The flow path 25 is opened, and the flapper 21 closes the flow path due to the biasing force of the spring 22. Close 20.

[0038] The main shaft 14 is connected to the fluid pressure in the right side fluid chamber 18B of the working fluid chamber 18, that is, the input From port 8 through pilot flow path 25, pilot chamber 23, through hole 24 to the right side Due to the action of the fluid pressure flowing into the fluid chamber 18B on the piston 16, the left side in FIG. is displaced.

[0039] This displacement of the piston 16 to the left causes the fluid pressure in the left fluid chamber 18A to increase in the flow path 19. , is exhausted to the outside through the pilot exhaust port 4, but the coil 29A is demagnetized. When the piston 16 is displaced to the right, external air flows into the flow path 19 and the pilot. It flows into the interior through the exhaust port 4.

[0040] Next, the operation of this embodiment will be explained.

[0041] First, in the state shown in FIG. 4 when the solenoid section 7 is not energized, the left fluid Due to the action of the fluid pressure in the chamber 17B on the piston 15, the main shaft 14 moves to the right side in the figure. This displacement of the main shaft 14 connects the output port 10 and the discharge port 9. It is.

[0042] Next, when the solenoid part 7 is energized, the fluid pressure in the right fluid chamber 18B reaches a peak. Due to the action on the stone 16, the main shaft 14, which had been displaced to the right in Fig. 4, has moved to the left in the same figure. side, the flow path is switched, and input port 8 and output port 10 are connected. It will be done.

[0043] With this displacement of the main shaft 14 to the left, the fluid in the left fluid chamber 18A flows into the flow path 19. , is exhausted to the outside through the pilot exhaust port 4.

[0044] Next, when the solenoid section 7 is de-energized, the flow inside the left fluid chamber 17B is Due to the action of body pressure on the piston 15, the main shaft 14 is displaced to the right in FIG. The flow path is switched by the displacement of the main shaft 14, and the output port 10 and the discharge port 9 are connected. Connected.

[0045] As the main shaft 14 is displaced to the right, the fluid in the right fluid chamber 18B is transferred to the flow path 20. , is exhausted to the outside through the pilot exhaust port 4.

[0046] The control valve of this embodiment is operated in this way, and its pilot exhaust port Since the filter 1 is built into the port 4, external dust such as inside the directional control valve 2, etc. This prevents intrusion into the air, and also produces a sound silencing effect.

[0047] In this case, in the filter 1 of this embodiment, the ring portion 1A and the breathable bottom portion 1B are Since the ring part 1A and the breathable bottom part 1B are integrated by integral molding, the ring part 1A and the breathable bottom part 1B are Compared to separate filter structures, the number of parts is reduced, manufacturing is easier, and manufacturing is easier. It is possible to reduce costs and simplify installation work. In addition, various products It is possible to change colors by format and facilitate parts management.

[0048] In particular, the manufacturing cost was reduced to 1/6 of the conventional one, according to the inventor's prototype. did.

[0049] Further, in the filter 1 of this embodiment, the ring portion 1A extends along its axial direction. Since it is divided by slit 1C and elastic deformation force is applied in the radial direction, Due to its elastic deformation force, the capacity for press fitting into the pilot exhaust port 4 during assembly is reduced. Efforts are made to ensure ease of use and to prevent the pilot from slipping out from the pilot exhaust port 4 after press-fitting. can be done.

[0050] In particular, regarding the ease of press-fitting into the pilot exhaust port 4, conventional filters Press-fitting into the pilot exhaust port 4 of No. 1 was supposed to be a mechanical and equipment work, but this In the embodiment, manual press-fitting was possible.

[0051] Although the present invention has been specifically explained above based on examples, the present invention is limited to the above-mentioned examples. This is not a fixed specification, and various changes can be made without departing from the gist thereof.

[0052] For example, in the embodiment, the slit 1C is provided in the ring portion 1A. However, the filter 1 of the present invention has a slit 1C. It is also possible to have a structure without any.

[0053] Further, when slits 1C are provided, the number thereof is arbitrary.

[0054]

[Effect of the idea]

Among the devices disclosed in this application, the effects obtained by typical ones are briefly explained. A simple explanation is as follows.

[0055] (1) According to the filter of the present invention, the ring part and the breathable bottom part are integrally molded with resin. Since the ring part and the breathable bottom part are separate parts, the filter is integrated. Compared to the main body structure, the number of parts is reduced, manufacturing is easier, manufacturing cost is reduced, and control valves are It is possible to simplify the integration work into the This makes it possible to change colors and simplify parts management.

[0056] (2) In the above case, the ring portion is formed into a slit extending along its axial direction. Therefore, if the structure is divided into parts and subjected to elastic deformation force in the radial direction, the elastic deformation force Due to the deformation force, it is easier to press into the pilot exhaust port during installation and the pressure is reduced. It is possible to ensure that the exhaust port is held in the exhaust port after entering the exhaust port.

[0057] (3) According to the control valve of the present invention, the filter having the above structure is installed at the pilot exhaust port. Since the filter is installed at the Ru.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a filter that is an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the filter.

FIG. 3 is a sectional view showing a state in which the filter is assembled into a pilot valve section.

FIG. 4 is a sectional view showing a control valve using the filter.

[Explanation of symbols]

1 filter 1A ring part 1B Breathable bottom 1C slit 2 directional control valve 3 Pilot valve part 4 Pilot exhaust port 4A Stepped section 5 End cover 6 Valve body part 7 Solenoid section 8 Input port 9 Exhaust port 10 Output port 11 Shaft hole 12 Valve seat 13 Valve seat 14 Main shaft 14A large diameter part 14B Large diameter part 15 Piston 16 Piston 17 Working fluid chamber 17A Right side fluid chamber 17B Left side fluid chamber 18 Working fluid chamber 18A Left side fluid chamber 18B Right side fluid chamber 19 Flow path 20 Flow path 21 Flapper 22 Spring 23 Pilot room 24 Through hole 25 Pilot flow path 26 Plunger 27 Plunger spring 28 plunger pin 29 Bobbin 29A coil 30 Fixed core

Claims (3)

[Scope of utility model registration request] 1. A bottomed cylindrical filter consisting of a fall-preventing ring part coaxially press-fitted into a pilot exhaust port of a control valve and an air permeable bottom part for the filter, wherein the ring part and the air permeable bottom part A filter characterized in that a bottom part is integrated with the bottom part by integral resin molding. 2. The filter according to claim 1, wherein the ring portion is divided by slits extending along its axial direction to apply elastic deformation force in the radial direction. 3. A control valve characterized in that the filter according to claim 1 or 2 is provided at a pilot exhaust port.