JP2009036280A - Pilot type flow control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pilot type flow control valve capable of easily regulating a flow rate according to use, low in manufacturing cost and requiring no inventory management. <P>SOLUTION: The pilot type flow control valve 1 has a pilot valve element 56 driven for open and close by an actuator 47 and a main valve element 2 contacted with and separated from a main valve seat 45 responsively to the pilot valve element and is provided with a stopper 3 for regulating a spaced distance between the main valve element and the main valve seat in opening of the main valve element. The stopper is a cylindrical member which is interposed between the main valve element and the pilot valve element and comprises screw portions 3a, 3b screwed with the main valve element and a contact portion 3c contacting with the pilot valve element and can vary a screwed length of the screw portions of the cylindrical member with the main valve element and regulate the spaced distance between the main valve element and the main valve seat. The stopper may be a bar-like member to be pressed into a hole 12a perforated in the main valve element 12 and the spaced distance between the main valve element and the main valve seat may be regulated by varying an insertion depth of the bar-like member into the hole. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pilot-type flow control valve, and more particularly to a pilot-type flow control valve that opens and closes a pilot valve body by an actuator and opens and closes a main valve body in response to the pilot valve body.

  Conventionally, as a pilot type flow control valve used in a refrigeration cycle of a cooling device or the like, a pilot type solenoid valve 40 as shown in FIG. 4 is disclosed in Patent Document 1 or the like. The pilot-type solenoid valve 40 includes a valve body 41 including a main valve chamber 44 having a main valve seat (valve port) 45, an inlet joint (inlet) 42 connected to the main valve chamber 44, and a main valve seat 45. An outlet joint (outlet) 43 connected below the main valve body 46, a main valve body 46 that is slidably inserted into the valve main body 41, contacts and separates from the main valve seat 45, and an electromagnetic actuator 47.

  The electromagnetic actuator 47 includes a coil 49 for energization excitation, a housing 48 disposed so as to cover the outer periphery of the coil 49, and an upper inner peripheral side of the coil 49, and is fixed to the housing 48 by a bolt 52. A cylindrical suction element 50 and a plunger 53 disposed opposite to the suction element 50. A holding hole 54 is provided at the lower end of the plunger 53, and a spherical pilot valve body 56 is accommodated in the holding hole 54 with a part of the lower surface thereof exposed, and is fixed by caulking (caulking portion 54a). . A vertical hole (spring chamber) 53a and a horizontal hole (equal pressure equalization hole) 53b are formed in the upper portion of the plunger 53, and a valve closing spring 51 made of a coil spring is inserted and locked in the vertical hole 53a.

  The plunger 53 is slidably inserted into the guide pipe 59, and the upper portion of the guide pipe 59 is disposed between the coil 49 and the suction element 50. The guide pipe 59 includes a small-diameter portion 59a into which the plunger 53 is slidably inserted, a large-diameter portion 59b into which the main valve body 46 is slidably inserted, and a valve body forming portion having a larger diameter than the large-diameter portion 59b. 59c, and a stepped portion between the small-diameter portion 59a and the large-diameter portion 59b includes a stopper having a flat stopper surface portion 59d and concave portions 59e (three places at intervals of 120 °) having a concave cross section above. Form.

  The main valve body 46 is formed in a short cylindrical body made of fluororesin or brass, and a pilot passage 57 that is opened and closed by the pilot valve body 56 is formed so as to penetrate the central portion. Further, the upper portion of the main valve body 46 is provided with a protruding portion 46 b that forms a back pressure chamber 58 and an upper end surface portion 46 a that abuts against a stopper surface portion 59 d of the guide pipe 59. The main valve chamber 44 is fitted with a valve opening spring 55 made of a coil spring that urges the main valve body 46 in the valve opening direction.

  A back pressure chamber 58 is formed between the plunger 53 and the main valve body 46. When the main valve body 46 is closed, the fluid introduced into the main valve chamber 44 from the inlet joint 42 Between the outer peripheral surface of the valve body 46 and the inner peripheral surface of the valve body 41 (between the sliding surfaces), it is introduced into the back pressure chamber 58, and from this back pressure chamber 58, the outer peripheral surface of the plunger 53, the guide The gap space 60 formed between the lower end surface of the suction element 50 and the upper surface of the plunger 53 passes through the inner peripheral surface of the pipe 59 (between the sliding surfaces), the horizontal hole 53b, and the vertical hole 53a. Led.

  In the pilot type electromagnetic valve 40 having the above configuration, when the coil 49 is energized, the plunger 53 is attracted and attracted to the attractor 50, and the pilot valve body 56 moves in the valve opening direction (upward). As a result, the pilot passage 57 is opened, and the fluid in the back pressure chamber 58 is discharged to the outlet joint 43 through the pilot passage 57 all at once. For this reason, the back pressure chamber 58 is decompressed, and the main valve body 46 is lifted by the urging force of the valve opening spring 55 to open. The main valve body 46 rises until the upper end surface portion 46a abuts against the stopper surface portion 59d, and stops in contact with the stopper surface portion 59d.

JP 2007-92825 A

  In the above-described conventional pilot type solenoid valve 40 shown in FIG. 4, it is necessary to change the flow rate of the fluid flowing through the pilot type solenoid valve 40 when the main valve body 46 is opened, depending on the application or the like. Plural kinds of main valve seats 45 having a diameter D are prepared, and a pilot-type solenoid valve 40 provided with a desired main valve seat 45 is manufactured as necessary. That is, as shown in FIG. 5 (a), the opening diameter of the main valve seat 45 is set to D1 or adjusted to a smaller fluid flow rate as shown in FIG. 5 (a). As described above, the flow rate of the fluid introduced from the inlet joint 42 and discharged to the outlet joint 43 through the main valve chamber 44 is adjusted using the main valve seat 45 having the opening diameter D2 smaller than the opening diameter D1.

  As described above, conventionally, since it is necessary to prepare the main valve seat 45 having a different opening diameter D for each required flow rate, the manufacturing cost of the pilot-type solenoid valve 40 is increased, and the inventory management of parts is troublesome. There was a problem that it took.

  Therefore, the present invention has been made in view of the above-mentioned conventional problems, and can easily adjust the flow rate according to the application, etc., has a low manufacturing cost, and has little labor for inventory management of parts. An object of the present invention is to provide a mold flow control valve.

  To achieve the above object, the present invention provides a pilot-type flow control valve that opens and closes a pilot valve body by an actuator and moves the main valve body to and away from the main valve seat in response to the pilot valve body. A stopper is provided for adjusting a separation distance between the main valve body and the main valve seat when the main valve body is opened.

  According to the present invention, the distance between the main valve body and the main valve seat can be adjusted by the stopper, so that the flow rate can be easily adjusted according to the use etc. Since it is not necessary to prepare a main valve seat having a different opening diameter for each flow rate, the manufacturing cost can be reduced and the labor for inventory management of parts can be reduced.

  In the pilot type flow control valve, the stopper is interposed between the main valve body and the pilot valve body, and is a cylindrical member having a threaded portion that is screwed into the main valve body, By changing the screwing length of the threaded portion of the thread-shaped member with the main valve body, the separation distance between the main valve body and the main valve seat can be adjusted.

  In the pilot type flow control valve, the stopper is interposed between the main valve body and the pilot valve body, and is a member that is press-fitted into a hole formed in the main valve body. The spacing between the main valve body and the main valve seat can be adjusted by changing the insertion depth of the member into the hole formed in the main valve body.

  As described above, according to the present invention, it is possible to provide a pilot-type flow control valve that can easily adjust the flow rate, has low manufacturing costs, and requires less labor for inventory management of parts.

  Next, an embodiment in which the present invention is applied to a pilot type solenoid valve will be described with reference to the drawings.

  The pilot type solenoid valve according to the present invention has a configuration as shown in FIG. The two pilot-type solenoid valves 1 and 1 'shown in the figure have basically the same configuration, and (a) adjusts the flow rate when the main valve body 2 is opened to a small flow rate, (B) shows the state which adjusted the flow volume at the time of valve opening of the main valve body 2 to the large flow volume. The basic configuration of the pilot type solenoid valve 1, 1 'is the same as that of the conventional pilot type solenoid valve 40 shown in FIG. 4, and therefore the same components as those of the pilot type solenoid valve 40 shown in FIG. Detailed description will be omitted. 1 also includes a coil 49, a bolt 52, and the like constituting the electromagnetic actuator 47 shown in FIG. 4, but these are not shown.

  First, the configuration of the pilot type solenoid valve according to the present invention will be described with reference to the pilot type solenoid valve 1 of FIG. This pilot-type solenoid valve 1 is also used in a refrigeration cycle of a cooling device or the like, and is driven to open and close a pilot valve body 56 by an electromagnetic actuator (not shown). The valve body 2 is brought into contact with and separated from the main valve seat 45.

  The pilot solenoid valve 1 is characterized by a main valve body 2 and a stopper 3 screwed into the main valve body 2 as shown in FIG. The main valve body 2 includes a male screw portion 2b and a female screw portion 2c in a concave portion 2a having a circular shape in plan view on the upper surface. On the other hand, the stopper 3 is formed in a cylindrical shape, and includes an external thread portion 3a that is threadedly engaged with the internal thread portion 2c of the main valve body 2 on the outer peripheral surface, and an internal thread that is threadably engaged with the external thread portion 2b of the main valve body 2 on the inner peripheral surface. The unit 3b is provided. As shown in FIG. 1A, the top portion 3 c of the stopper 3 abuts against the stopper surface portion 59 d of the guide pipe 59 to form a back pressure chamber 58.

  Next, the operation of the pilot type electromagnetic valve 1 will be described with reference to FIG.

  As in the case of the pilot-type solenoid valve 40 shown in FIG. 4, when the main valve body 2 is closed, the fluid introduced from the inlet joint 42 into the main valve chamber 44 is the outer periphery of the main valve body 2. Between the surface and the inner peripheral surface of the valve body 41 (between the sliding surfaces), and is introduced into the back pressure chamber 58. From the back pressure chamber 58, the outer peripheral surface of the plunger 53 and the inner peripheral surface of the guide pipe 59 (Between the sliding surfaces), through the horizontal hole 53b and the vertical hole 53a, it is also guided to a gap space 60 (see FIG. 4) formed between the lower end surface of the suction element 50 and the upper surface of the plunger 53. It is burned.

  Next, when a coil (not shown) of the electromagnetic actuator is energized, the plunger 53 is attracted and attracted to the attractor 50, and the pilot valve body 56 moves in the valve opening direction (upward). As a result, the pilot passage 57 is opened, and the fluid in the back pressure chamber 58 is discharged to the outlet joint 43 through the pilot passage 57 all at once. For this reason, the back pressure chamber 58 is decompressed, and the main valve body 2 is raised by the urging force of the valve opening spring 55 to open. The main valve body 2 rises until the top portion 3c of the stopper 3 screwed with the main valve body 2 comes into contact with the stopper surface portion 59d of the guide pipe 59, and stops in contact with the stopper surface portion 59d. In this state, the fluid introduced from the inlet joint 42 passes through the main valve chamber 44, and the opening 5 between the lower end surface 2d of the main valve body 2 and the main valve seat 45 (FIG. 1 (a ) Passes through the grid-like hatching) and is discharged to the outlet joint 43.

  Next, the procedure for adjusting the flow rate of the pilot-type solenoid valve 1 (1 ') will be described with reference to FIGS. 1 (a) and 1 (b) in comparison.

  In FIG. 1A, the protrusion length L of the stopper 3 (the distance between the top 3c of the stopper 3 and the upper surface 2e of the main valve body 2) is set to L1. The protruding length L1 can be set by adjusting the threaded lengths of the male screw portion 2b and the female screw portion 2c of the main valve body 2 shown in FIG. 2, and the female screw portion 3b and the male screw portion 3a of the stopper 3. it can. As a result, a relatively narrow opening 5 can be formed.

  Here, in order to increase the flow rate, the threaded lengths of the male thread 2b and female thread 2c of the main valve body 2 and the female thread 3b and male thread 3a of the stopper 3 in FIG. 2 are increased. That is, as shown in FIG. 1B, the stopper 3 is tightened so as to be further screwed into the main valve body 2 to shorten the protruding length L of the stopper 3 to L2. Thereby, when the main valve body 2 is opened, the opening area of the opening 6 (hatching in a lattice shape in FIG. 1B) between the lower end surface 2d of the main valve body 2 and the main valve seat 45 is reduced. It is larger than the opening 5 and can flow a larger amount of fluid than the pilot-type solenoid valve 1 of FIG.

  FIG. 3 shows the relationship between the protruding length L of the stopper 3 and the fluid flow rate when the main valve body 2 is opened. Thus, it can be seen that the flow rate decreases as the protrusion length L of the stopper 3 increases.

  As described above, according to the pilot type electromagnetic valve 1 (1 ′), the flow rate when the main valve body 2 is opened can be adjusted by changing the protrusion length L of the stopper 3. The flow rate can be easily adjusted according to the application. Further, as the main valve seat 45, one having a constant opening diameter D can be used in common, and there is no need to prepare a main valve seat 45 having a different opening diameter D for each necessary flow rate as in the prior art. Also, inventory management of parts becomes easy.

  In the above embodiment, as shown in FIG. 2 (a), the stopper 3 is a cylindrical member that is screwed with the main valve body 2. However, as shown in FIG. )), And press-fitted into the plurality of holes 12a drilled in the upper surface of the main valve body 12, the press-fitting condition of the stopper 4, that is, the insertion depth of the stopper 4 into the hole 12a, The protruding length L of the stopper 4 (the distance between the upper end surface portion 4a of the stopper 4 and the upper surface 12b of the main valve body 12) was set. Thereby, when the main valve body 12 is opened, the upper end surface portion 4a of the stopper 4 comes into contact with the stopper surface portion 59d (see FIG. 1), and the flow rate at the time of opening of the main valve body 12 corresponding to the protruding length L is obtained. Can do.

  In the above embodiment, the case where the present invention is applied to an electromagnetic valve using an actuator having a plunger and an attractor as an actuator has been described. However, the present invention is also applied to an electric valve using an electric motor as an actuator. can do.

1 is a partially omitted cross-sectional view showing a pilot type solenoid valve according to an embodiment of the present invention. It is a partially broken perspective view which shows the main valve body and stopper of the pilot type solenoid valve which are one embodiment of this invention. It is a graph which shows the relationship between the protrusion length of the stopper of the pilot type solenoid valve which is one embodiment of this invention, and flow volume. It is a whole sectional view showing an example of the conventional pilot type solenoid valve. It is a partially omitted cross-sectional view for explaining the flow rate adjustment procedure of a conventional pilot type solenoid valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pilot type solenoid valve 1 'Pilot type solenoid valve 2 Main valve body 2a Recessed part 2b Male thread part 2c Female thread part 2d Lower end surface 2e Upper surface 3 Stopper (cylindrical shape)
3a Male thread part 3b Female thread part 3c Top part 4 Stopper (bar shape)
4a Upper end surface portion 5 Opening portion 6 Opening portion 12 Main valve body 12a Hole portion 12b Upper surface 40 Pilot type solenoid valve 41 Valve body 42 Inlet joint 43 Outlet joint 44 Main valve chamber 45 Main valve seat 46 Main valve body 50 Suction element 51 Closed valve Spring 53 Plunger 53a Vertical hole 53b Horizontal hole 54 Holding hole 54a Caulking portion 55 Valve opening spring 56 Pilot valve body 57 Pilot passage 58 Back pressure chamber 59 Guide pipe 59a Small diameter portion 59b Large diameter portion 59c Valve body forming portion 59d Stopper surface portion 59e Recess 60 Gap space

Claims (3)

A pilot-type flow control valve that opens and closes a pilot valve body by an actuator and moves the main valve body to and from the main valve seat in response to the pilot valve body,
A pilot-type flow control valve comprising a stopper for adjusting a separation distance between the main valve body and the main valve seat when the main valve body is opened.   The stopper is a cylindrical member that is interposed between the main valve body and the pilot valve body and includes a screw portion that is screwed into the main valve body, and the main member of the screw portion of the cylindrical member. The pilot-type flow control valve according to claim 1, wherein a spacing distance between the main valve body and the main valve seat is adjusted by changing a screwing length with the valve body.   The stopper is a member that is interposed between the main valve body and the pilot valve body, and is press-fitted into a hole formed in the main valve body. The stopper is formed in the main valve body. The pilot-type flow control valve according to claim 1, wherein a distance between the main valve body and the main valve seat is adjusted by changing an insertion depth into the provided hole.

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