JPH057597B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centralized lubrication system that distributes and supplies liquids such as lubricants and viscous bodies (hereinafter simply referred to as fluids), in which each distribution valve is used to apply an alternating action in the direction of fluid flow, such as a pump. The present invention relates to a progressively advancing type annular single-pipe distribution valve for use in a distribution system that is arranged in series at a suitable location in an annular piping system based on a device that operates as a base point.

The centralized lubrication or lubrication (hereinafter simply referred to as lubrication) device for a progressive annular single-pipe system is designed to prevent the entire system from malfunctioning if one of the multiple or numerous distributing valves installed malfunctions. Since the pump stops operating, it is extremely reliable in that malfunction can be easily detected at a specific location (for example, around the pump unit) without using indirect means. In addition, the entire system has a small number of component parts and can be produced at low cost, and the fluid supplied to the piping system of the system, including the inside of the distribution valve, can undergo 100% metabolism and has no stagnant parts such as grease. Therefore, the distribution valve does not malfunction due to the deterioration and deterioration of fats and oils caused by long-term stagnation of grease, etc. The distribution valve of this system is superior to other metered discharge type distribution valves. , it is basically compact because the volume per distribution port is small, and the discharge pressure can be easily selected over a wide range of generally 3 to 70 kg/cm ² by simply adjusting the supply pressure at the oil supply source. Since the distribution valves are arranged in series using a single annular pipe, the unit cost of installation is low, and the biggest advantage is that they have a unique function that is classified as a metering type, that is, a volumetric type. This has the advantage that the discharge amount is always constant.

However, in the conventional annular single-pipe system distribution device, the configuration related to the flow path of the circuit that communicates between the plunger chambers of the distribution valve used is such that at least the opening of the plunger chamber is As a result, there is a drawback that pressure loss is significant during the process in which fluid flows through the flow path of the distribution valve. Due to this drawback, the distribution device of this system cannot be used for distribution to multiple locations because there is a practical danger in arranging a large number of distribution valves in one piping system. There are some difficulties.

The object of the present invention is to provide an excellent distribution valve that has less pressure loss, which is the only drawback in the above-mentioned annular single pipe system, and to provide a distribution valve for the system that can distribute to a large number of locations.

Furthermore, the present invention aims to stabilize the function and downsize the three-port, two-way pilot valve mechanism, which is provided as a passage switching means for the main passage necessary to provide the above-mentioned excellent distribution valve.

A feature of the present invention is that a plurality of unit distributing valves each consisting of plunger chambers 4, 3 whose longitudinal ends are closed and skewer-shaped plungers 7, 6 having one or two small-diameter portions in the longitudinal center thereof are provided. , a pair of main pipe connection ports for arranging the main pipes P in series in an annular single pipe type are arranged along the longitudinal direction of the plunger,
Flow passages 16 and 16' that open at positions adjacent to the pair of main pipe connection ports are provided and are led to the first stage plunger chamber 4, and the flow passages are connected to the plunger chamber 4 that holds the plungers 7 and 6. , 4 or 4, 3 includes a section passage extending so as to communicate the midsection of the plunger chamber in the pre-operation stage with the end of the plunger chamber in the post-operation stage, and the section passage is used for the operation of the plunger in the former stage. By alternately supplying fluid under pressure from the pair of main pipe connection ports, the plungers 7 and 6 receive the pressure of the supplied fluid that alternately flows in opposite directions. Each discharge hole 17 is provided with a reciprocating motion by sequential operation, and is opened into the section passage and each plunger chamber by a surface perpendicular to the axis of a different diameter portion formed in a small diameter portion midway along the length of the plunger. The downstream plunger chamber 4 is pressurized as the downstream plunger operates through a discharge hole that communicates with the downstream plunger chamber through the section passage. In a single pipe loop type progressive distributing valve, in which the fluid held at one end of the valve body 1 is forced to be discharged by the plungers 7 and 6 (see Fig. 1), the main pipe connection of the valve body 1 is A hole is bored centering around the hole, a sleeve 21 is fitted into the hole, and a valve seat 5 is screwed onto both sides of the sleeve and provided on the inner end surface.
1, an annular groove 24 is provided at a position of appropriate dimensions from the valve seat, and a through hole 25 is provided between the annular groove and the passages 11, 11' in the axial center of the annular groove, which also serves as a connection nipple. A pair of valve members 22, a pair of valve elements 52 disposed to engage with each of the valve seats 51, and a pair of valve elements 52 provided between the valve elements to press each of the valve elements to the valve seats. compression spring 53
and three openings 2 configured in parallel with the sleeve 21.
a spool-type pilot valve in the direction; and an inflow passage 13 that opens at the longitudinal center of the valve chamber 3 of the pilot valve and opens at an intermediate position between the pair of valve elements 52.
and annular grooves 24 of each of the pair of valve members 22.
A pair of guide holes 15, 15' that communicate between the independent chamber formed by the valve chamber 3 and the valve chamber 3, and between the inner surface of the hole into which the sleeve 21 is fitted in the guide hole portion and the outer peripheral surface of the sleeve. A pair of branch chambers 26 with a gap formed between them, and a pair of flow passages 16, 16 provided from a predetermined position of the branch chambers 26 toward the end of the plunger chamber 4 of the unit distributing valve in the first stage of operation. ′
and a plunger 7 of the unit distribution valve equipped with the fluid supplied from the main pipe connection port,
7' and 7'', the valve spool 6 of the pilot valve is operated in the same manner as the unit distributing valve to open the inflow passage 13 and one of the inlet holes 15, and the valve element 52 is opened. The fluid that flows in by pushing it open in the direction of
From the inflow passage 13 to the valve chamber 3 and the guide holes 15 and 1
5' and the main passage 11, 1 on the exit side.
The main pipe passage leading to the main pipe 1' is configured to allow flow in one direction, and each distribution valve disposed next by the main pipe contains fluid that does not pass through the circuit inside the distribution valve.
In other words, the present invention relates to the structure of an annular single-pipe distribution valve characterized in that a direct fluid with little pressure reduction is supplied from a supply source.

The features of the present invention will become clear from the following description based on specific examples of the drawings and one embodiment.

According to the basic structure shown in FIG. 1, this distribution valve has a symmetrical structure centering on the display line C (up and down in the figure). The main pipe P connects the distributing valves or between the distributing valves and the pump unit, and communicates with the passages 11 and 11' in the distributing valves. Said passage 11,1
1' is in a cutoff state in the central part of the distribution valve of the present invention by each internal valve which is functionally equipped and will be described later. A spool-type pilot valve is constructed parallel to the passage at the blocked portion of the passage. Check valves 5 and 5' having a function of blocking outward fluid flow are arranged inside the passage. In the center of the valve chamber 3 of the pilot valve, there is an inflow passage 13 provided along the indication line.
is open, and the inflow passage 13 communicates with a bypass passage 14 at an intermediate position between the check valves. With respect to this inflow passage 13, passages 11 and 11' are provided on the outside of the check valve, a through hole 25, an annular groove 24, a branch chamber 26, and a guide hole 1.
5 and 15' are formed. Three unit distribution valves are arranged in parallel with the pilot valve. This unit distribution valve is provided with a plunger chamber 4, 4', 4'' which is closed on both sides, and in this plunger chamber there are slidable plungers 7, 7', 7 having one or two small diameter portions in the midsection. ”. The plunger chamber 4 before and after the operation order,
4 or 4, 3, the plunger is opened at a position communicating with the end of the plunger chamber away from the pressure-receiving end face of the plunger at the final stage of operation of the plunger in the previous stage, and the plunger is operated in the opposite direction. In some cases, a section passage hole that acts as a part of the flow passage 16 provided under the basic condition that it opens in the middle of the plunger chamber corresponding to the small diameter part of the middle of the plunger at the end of the operation of the plunger is inserted into the latter stage of the plunger. The side in the operating direction of the plunger 7 that communicates with two opposing flow circuits that are configured to open at one end of the chamber and is operated by the pressure of the supply fluid that acts on the plunger chamber at the post-operation stage. The fluid pressurized at the end face of the plunger chamber flows backward through the flow passage opened at the end of the plunger chamber on the pressurizing side, and engages with the same small diameter part through the central small diameter part of the preceding plunger. It has a pair of main pipe connection ports to be fed under pressure from the discharge hole 17 and to be arranged in series in the main pipe P system of the annular single pipe, and fluid and viscous material are alternately supplied from the pair of main pipe connection ports. By pressurizing the plungers 7 and 6 of the plurality of unit distributing valves, the plungers 7 and 6 of the plurality of unit distributing valves are given reciprocating motion by sequentially advancing operation, and are supplied to the predetermined discharge hole 17 through the small diameter part in the middle of the longitudinal direction of the plungers. It is designed to pump more fluid.

The following description will be made based on the embodiments shown in FIGS. 2 to 8.

A bored hole is provided in the valve body 1 with the center of the main pipe at the main pipe connection portion as the axis. A sleeve 21 is fitted into this hole. A pair of valve members 22, which also serve as connection nipples, are screwed onto both sides of this sleeve. This valve member 22 has a valve seat 51 formed on its inner end surface, and an annular groove 24 at a position of an appropriate size from the valve seat. Incidentally, the peripheral surfaces on both sides of the annular groove 24 of this valve member cooperate with the inner surface of the sleeve to block passage of fluid, and the annular groove and the passages 11, 11' provided in the shaft center part are connected to each other.
A through hole 25 is provided between the two.

A pair of valve elements 52 are arranged to engage with each of the valve seats 51, and a compression spring 53 is provided between the valve elements and presses each of the valve elements against the valve seat. This constitutes a check valve.

The three-port, two-way spool type pilot valve constructed in parallel with the sleeve 21 is constructed as follows.

The valve chamber 3 of the pilot valve has an inflow passage 13 that opens in the longitudinal center thereof and opens at an intermediate position between the pair of valve elements 52, and the pair of valve members 22.
A pair of guide holes 15, 1 that communicate between the independent chambers formed by the respective annular grooves 24 and the valve chamber 3.
5' is provided.

In the guide holes 15 and 15', a pair of branch chambers 26 are formed by forming a gap between the inner surface of the hole into which the sleeve 21 is fitted and the outer peripheral surface of the sleeve.
Two flow passages 16, 16' are provided extending from a predetermined position of the branch chamber 26 toward the end of the plunger chamber 4 of the unit distribution valve of the first stage of operation. That is, it is configured such that the fluid supplied from the main pipe connection port is guided to the plunger chamber 7 of the unit distribution valve via one of the set branch chambers 26 of the pair of branch chambers 26. There is.

The present invention provides an inflow passage 13 of a three-port, two-way spool-type pilot valve mechanism equipped as a switching means for the main passage of a distribution valve, with a pair of valve members and a valve seat formed inside the valve member. By using a check valve composed of a valve element, it is possible to install it in the longitudinal center of the pilot valve.
In addition to being able to share one short compression spring as a spring that imparts elasticity to at least one pair of valve elements, it is also possible to provide the aforementioned three-port, two-way pilot valve mechanism;
We were able to provide a small and excellent distribution valve structure that can be installed even in narrow spaces such as machines.

The structure of the unit distribution valve in the embodiment is such that the diameter of the plunger 7 used is changed and the plunger is used as a means for forming necessary holes such as passages in the plunger chamber 4 at right angles to the axis of the valve chamber. A structure is shown in which the chamber is formed in a sleeve and the unit distribution valve is constructed as a part inside the sleeve so that it can be replaced. The sleeve of this structure is simply a means for adjusting the circumference of the plunger and the plunger chambers 4, 3, and a screwing means for a nipple that closes both ends of the plunger chamber, and is provided with other means that meet these requirements. In this case, it is not an essential requirement for implementing the present invention.

Since the present invention has the above configuration, it operates as follows.

When fluid is supplied from the main pipe connection port to the passage 11 or 11', a part of the supplied fluid flows from the through hole 25 on the outer periphery of the valve member 22, which also serves as a connection nipple, to the annular groove 24 and the guide holes 15, 15'. , and is pumped into the flow passages 16, 16' via a branch chamber 26 formed between the sleeve and the inner surface of the hole. Then, it is further supplied toward the plunger chamber of the aforementioned unit distribution valve. In each plunger chamber 4, 4', 4'', a slidable plunger 7, 7', 7'' is operated in sequence. As the plunger operates, the discharge hole 17 and the section passage 16 opening into the plunger chamber are automatically and sequentially opened and closed, and the fluid flow advances. In addition, the plunger chambers 4 and 3 on the opposite side where the supply fluid of each plunger acts
A compression action occurs at the end of the plunger as the plunger operates, and the fluid in the chamber is discharged through the discharge hole 17 which is selectively opened in response to the aforementioned opening/closing function of the plunger.
Discharge more.

The fluid that travels through the circuit inside the valve as the plunger operates is supplied to the valve chamber 3 of the pilot valve in the same way as the unit distribution valve at its final stage, and operates the valve spool 6. Due to the operation of this valve spool 6, the fluid guided to the small diameter portion of the spool 7'' at the previous stage is discharged from the discharge port 17 at the final stage. This action pushes the valve element 52 inwardly open and directs the fluid in the inflow passage from the inflow passage 13 to the valve chamber 3,
Then, a flow path in a predetermined direction of the main pipe passage leading to the main passage 11, 11' via the guide holes 15, 15', the branch chambers 26, 26', and the through hole 25 is opened. Due to this action, the supply fluid in the main pipe flows toward the distribution valve or other backflow control device, etc. disposed at the next stage after the above action is completed. In addition, if the fluid in the circuit flows backward, a fluid action will occur in the passage described above, and a reverse movement will occur in each plunger and spool.

Since the present invention provides the above configuration and effects,
The following effects can be obtained.

The fluid supplied from the main pipe P of the connection is passed through the passage 1
1, 11', the check valve 5 is opened, the fluid passes through the bypass passage 14, is forced into the inflow passage 13, is guided by the small diameter portion of the spool in the valve chamber 3 of the pilot valve, and is supplied to the guide holes 15, 15'. from the branch chamber 26 and the annular groove 24 of the valve member 22 to the passages 11', 1
1 toward the main pipe P of the external piping.
As is clear from this action, the fluid in the main pipe P that does not pass through the small-diameter flow path inside the distribution valve is supplied to the distribution valve installed next to the distribution valve. Since the pressure loss due to resistance etc. is extremely small, it is possible to arrange a significantly large number of such distribution valves in a unified system using piping connections similar to the specific example (Fig. 1), and to distribute fluids such as oil supply to a large number of oil supply points. The effect is remarkable.

Further, the use of the valve member 22 and the sleeve 21, and the provision of a pair of check valves facing outward and the use of a single compression spring 53 for both check valves, make the spool-type pilot In addition to making it possible to use a double-crested spool in the valve, there is no waste in the dimensions of various parts of the structure of related parts, and the dimensions of the distribution valve in the width direction (up and down in Figure 4) can be made extremely compact. Therefore, the effect that it can be placed in a narrow space such as a machine is enormous.

[Brief explanation of the drawing]

Fig. 1 is a simplified structural diagram of the present invention, Fig. 2 is a plan view showing an embodiment of the invention, Fig. 3 is a side view of Fig. 1, and Fig. 4 is shown along line 4-4 of Fig. 3. 5 is a sectional view taken along line 5-5, FIG. 6 is a sectional view taken along line 6-6, and FIG. 7 is a sectional view taken along line 7-7.
FIG. 8 is a sectional view taken along line 8-8. 1... Valve body, 3... Valve chamber, 4, 4', 4''...
...Plunger chamber, 5,5'...Check valve, 6...
Pilot (valve) spool, 7, 7', 7''...plunger, 11, 11'...passage, 13...inflow passage, 14, 14'...bypass passage, 15,
15'...Guiding hole, 16, 16'...Flow passage (section passage), 17...Discharge hole, 21...Sleeve, 22
... Valve member, 23 ... Seal action surface, 24 ... Annular groove, 25 ... Through hole, 26 ... Branch chamber, 51 ... Valve seat, 52 ... Valve element, 53 ... Compression spring, P ... ...In charge.

Claims (1)

[Scope of Claims] 1. A plurality of unit distributing valves each consisting of plunger chambers 4, 3 with both ends closed and skewer-shaped plungers 7, 6 having one or two small diameter portions in the longitudinal center thereof. A single pipe loop type progressive distributing valve (see Fig. 1) has a basic structure consisting of a hole bored in the main pipe connection part of the valve body 1, a sleeve 21 fitted into this hole, and a sleeve 21 fitted into the hole. A valve seat 51 is formed on the inner end surface of the sleeve, and an annular groove 24 is provided at a position of appropriate dimensions from the valve seat.
11', a pair of valve members 22 which also serve as connection nipples and have a through hole 25 between them, a pair of valve elements 52 disposed to engage with each of the valve seats 51, and A three-mouth, two-way spool type having a compression spring 53 provided between the valve elements and pressing each of the valve elements against the valve seat, and a spool configured in parallel with the sleeve 21 and serving as a discharge plunger. A pilot valve, an inflow passage 13 that opens at the longitudinal center position of the valve chamber 3 of the pilot valve and an intermediate position between the pair of valve elements 52, and each ring of the pair of valve members 22. A pair of guide holes 15, 15' that communicate between the independent chamber formed by the groove 24 and the valve chamber 3, and the inner surface of the hole into which the sleeve 21 is fitted in the guide hole portion and the outer peripheral surface of the sleeve. A pair of branch chambers 26 with a gap formed therebetween, and a plunger chamber 4 of a first-stage unit distribution valve that operates from a predetermined position of the branch chambers 26.
A pair of flow passages 16, 1 provided toward the ends of
6', and after the fluid supplied from the main pipe connection port operates the plungers 7, 7', 7'' of one or more equipped unit distribution valves, the same unit distribution valves are operated at the final stage. The valve spool 6 of the pilot valve is actuated, the valve spool 6 opens the inflow passage 13 and the guide hole 15, and the valve element 52 is pushed open inward to direct the inflowing fluid from the inflow passage 13 to the valve. Room 3,
and is configured to allow unidirectional flow of the main pipe passageway guided to the main passageways 11, 11' via the guide holes 15, 15' and the branch chambers 26, 26'.
A structure of an annular single-pipe distribution valve characterized by being equipped with a main pipe passage switching mechanism.