JP2008111473A - Temperature sensitive valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature sensitive valve for surely preventing the malfunction of a valve element. <P>SOLUTION: The temperature sensitive valve comprises a body 1 having flow-in port 1a and a flow-out port 1b for fluid, a valve seat member 4 having a valve port 41a, the valve element 51 to be moved up and down to open/close the valve port 41a, a temperature sensitive driver 7 for driving the valve element 51 to be closed in response to the temperature of the fluid, and a resetting spring 9 for applying elastic force to the valve element 51 to be opened against the driving force of the temperature sensitive driver 7. The valve seat member 4 has a body 41 having the valve port 41a, a guide portion 42 having an introduction hole 42a for introducing the fluid into the valve port 41a and a guide hole 42b for guiding the valve element 51 and protruding upward from an upper face 41b of the body 41. The resetting spring 9 is externally fitted to the guide portion 42, and its lower end 9b abuts on the upper face 41b of the body 41. On the root of the outer periphery of the guide portion 42, an inclined portion 42c is formed wider toward the lower side. The lower end of the inclined portion 42c corresponds to an inner diameter edge 9ba of the lower end 9b of the resetting spring 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a temperature sensing valve mainly used for a temperature control trap of a steam pipe, and more particularly to an improvement of a temperature sensing valve capable of preventing steam leakage during a valve closing operation.

  2. Description of the Related Art Conventionally, a temperature sensitive valve closes a valve opening of a valve seat member with a valve body by compressing or extending a return spring in the axial direction by deformation of a temperature sensitive driving body that senses the temperature of a fluid such as steam (for example) Closed) or opened (opened).

The valve seat member has a main body having the valve port, and a guide portion protruding upward from the upper surface of the main body, and the guide port is fitted with the introduction port for introducing fluid into the valve port and the valve body. A guide hole for guiding them together is provided. The return spring is externally fitted to the guide portion, and is disposed concentrically with the guide portion and radially outward of the outer peripheral surface thereof (see Patent Document 1).
JP-A-2005-147222

  In the case of the temperature sensing valve having the above-described configuration, since there is a gap between the return spring and the guide portion, the return spring is offset in the radial direction, particularly during the valve closing operation due to compression of the return spring. The center of action of the spring force of the return spring is displaced in the radial direction, causing the valve body that is linked to this to tilt and cause poor seating on the valve seat member, resulting in malfunction of the temperature sensing valve. And steam leaks from the valve port.

  Therefore, the position of the return spring is regulated by providing a recess in the upper surface of the valve seat member where the lower end of the return spring comes into contact, and inserting the lower end of the return spring into the recess. However, since there is a radial gap between the recess and the lower end of the return spring due to the machining of the recess, the center of the return spring is reliably prevented. It is not possible.

  Then, an object of this invention is to provide the temperature sensing valve which can prevent reliably the seating defect of the valve body to a valve seat member.

  In order to achieve the above object, an air cleaner for an engine according to the present invention opens and closes the valve opening by moving in a vertical direction a body having a fluid inlet and outlet, a valve seat member having a valve opening, and the like. A valve body, a temperature-sensitive drive body that drives the valve body in a valve closing direction according to the temperature of the fluid, and an elastic force in the valve opening direction against the driving force of the temperature-sensitive drive body. A return spring to be added, wherein the valve seat member has a main body having the valve port, an introduction hole for introducing fluid into the valve port, and a guide hole for fitting and guiding the valve body. The return spring is located concentrically with the guide portion and radially outward of the outer peripheral surface thereof, and the lower end of the return spring is disposed on the valve seat. Abuts the upper surface of the main body of the member, and spreads downward at the base of the outer periphery of the guide portion Oblique portion is formed, the lower end of the inclined portion is consistent with the inner diameter edge of the lower end of the return spring.

  According to this configuration, when the return spring is operated and compressed by the deformation of the temperature-sensitive drive body when the valve is closed, the inner diameter edge of the lower end of the return spring that is in contact with the upper surface of the valve body is a guide. Since it coincides with the lower end of the downwardly widening inclined portion formed at the base portion of the portion, misalignment of the return spring is prevented at the lower end of the inclined portion. As a result, the action center line of the spring force of the return spring can be prevented from shifting in the radial direction, so that the valve body that operates in conjunction with the return spring is not inclined, and the seating performance of the valve body is improved. The operation of the temperature sensing valve is stabilized.

  In the present invention, the outer peripheral surface of the inclined portion is preferably a conical surface. The conical surface is easy to process. Furthermore, the inclination angle of the conical surface with respect to the upper surface of the valve body is preferably 50 to 70 °. When the inclination angle is less than 50 °, the possibility that the return spring rides on the inclined portion increases, and when the inclination angle exceeds 70 °, a certain gap is formed between the guide portion and the return spring. This makes it difficult for the return spring to come into contact with the guide portion and to cause a local imbalance of the spring force.

  According to the present invention, the inner diameter of the lower end portion of the return spring that is in contact with the upper surface of the valve body matches the lower end of the downwardly widening inclined portion formed at the root portion of the guide portion of the valve body, Centering of the return spring is prevented at the lower end of the inclined portion, whereby the seating property of the valve body is improved and the operation of the temperature sensitive valve is stabilized.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a temperature sensitive valve according to an embodiment of the present invention. The temperature sensing valve shown in FIG. 1 includes a body 1 having an inlet 1a and an outlet 1b for a fluid such as steam on both the left and right sides, and a cover 2 that is detachably screwed to an upper opening of the body 1. And a cap 3 that covers the upper portion of the cover 2. The cover 2 closes the upper opening of the valve chamber 15 provided inside the body 1.

  Inside the body 1, there is a valve seat member 4 screwed to the bottom of the valve chamber 15, and is fitted to the valve seat member 4 and supported so as to be movable in the vertical direction (axial direction). A valve stem 5 having a valve body 51 is disposed. The upper end side of the valve stem 5 is supported by an adjustment bolt 6, and this adjustment bolt 6 is screwed to a screw hole 20 of the cover 2 and fixed by a lock nut 21, and the O-ring 6 a is connected to the cover 2. It is sealed by. By adjusting the movement of the adjusting bolt 6 in the vertical direction, the height position of a temperature-sensitive driving body 7 to be described later in the body 1 can be adjusted as appropriate, and the spring reaction force of the return spring 9 can be adjusted. The valve seat member 4 includes a main body 41 having a valve port 41a, and a guide portion 42 that protrudes upward from the upper surface of the main body 41 and is integrally formed. The guide portion 42 is provided with a plurality of introduction holes 42a arranged in the circumferential direction for introducing fluid into the valve port 41a and a guide hole 42b for fitting and guiding the valve body 51. The valve port 41 is opened or closed by the valve body 51 at the lower end thereof by the vertical movement of the valve rod 5.

  A temperature-sensitive drive body 7 that drives the valve body 51 up and down according to the temperature of the fluid is disposed in the valve stem 5 so as to be vertically movable, located in the valve chamber 15 and below the adjustment bolt 6. ing. The temperature-sensitive drive body 7 is composed of a bimetal laminate in which a plurality of bimetals are laminated, and the upper end portion is in contact with the lower end surface of the adjustment bolt 6. Further, a spring receiving member 8 is attached to the lower side of the temperature sensitive driving body 7, and a return coil spring 9 is interposed between the spring receiving member 8 and the main body 41 of the valve seat member 4. Here, as the bimetal laminated body constituting the temperature-sensitive drive body 7, for example, a set of two sheets is set so that a high expansion member such as Cu is located on the outside side and a low expansion member such as Ni is located on the inside side. A driving body receiving member in which a plurality of sets, each of which is a set of two sheets, are fitted into the valve stem 5 and the lower end portion of the temperature sensitive driving body 7 is attached to the upper surface of the spring receiving member 8 shown in FIG. 16 is supported on the upper surface. In a space 17 between the spring receiving member 8 and the driving body receiving member 16, a collar 18 fixed to the valve stem 5 is accommodated.

  The fluid inlet 1a and the valve chamber 15 shown in FIG. 1 communicate with each other via the introduction side communication hole 10, and the fluid outlet 1b and the valve chamber 15 communicate with each other and extend downward from the valve port 41a. The passage 11 and the communication passage 11 communicate with each other via a lead-out side communication hole 12 that branches from the middle to the side.

  As shown in FIG. 2, the return spring 9 is externally fitted to the guide portion 42, that is, concentrically with the guide portion 42 and located radially outward of the outer peripheral surface 42d, and the upper end portion 9a is The lower end 9 b of the return spring 9 is in contact with the horizontal upper surface 41 b of the main body 41. An inclined portion 42c that is downwardly diverging downward is formed at the base portion of the outer periphery of the guide portion 42. It matches. The outer peripheral surface of the inclined portion 42c is a conical surface concentric with the guide portion 42, that is, concentric with the valve body 51, and an inclination angle θ of the conical surface with respect to the upper surface 41b is 60 °. Thus, manufacture becomes easy by making the outer peripheral surface of the inclined part 42c into the conical surface. The inclination angle θ of the conical surface with respect to the upper surface 41b is preferably 50 to 70 °. When the inclination angle is less than 50 °, the possibility that the return spring rides on the inclined portion increases, and when the inclination angle exceeds 70 °, a certain gap is formed between the guide portion and the return spring. This makes it difficult for the return spring to come into contact with the guide portion and to cause a local imbalance of the spring force.

  As shown in FIG. 2, the valve body 51 has a tip cone angle α as small as about 48 to 55 °, and when the valve is closed, the tip 51a penetrates the valve port 41a and protrudes below the valve port 41a. So long. As a result, scales such as rust, dust and scale adhering to the valve port 41a can be scraped off by the valve body 51.

  Next, the operation when the temperature sensitive valve according to the above configuration is used as a steam trap will be described with reference to FIG. When the steam flowing in the body 1 from the inflow port 1a or the fluid mixed with steam and condensate has a predetermined temperature or more, as shown in FIG. 2, each thermal expansion element (each bimetal group) of the temperature-sensitive driver 7 is It expands and deforms into a curved shape in the vertical direction (axial direction). Due to the deformation of the temperature-sensitive driving body 7, the driving body receiving member 16 and the spring receiving member 8 move downward, and the return spring 9 is compressed in the axial direction. As the driving body receiving member 16 moves downward, the collar 18 is pushed down by the driving body receiving member 16, so that the valve stem 5 is lowered in the axial direction and slides in the guide hole 42 b of the guide portion 42. However, the valve body 51 of the valve stem 5 is pressed against the valve port 41a to close the valve port 41a, and the valve is closed.

  During the valve closing operation, when the valve opening 41a is closed by the valve body 51, the lower end portion 9b of the return spring 9 is strongly pressed against the upper surface 41b of the main body 41. Since the inner diameter edge 9ba matches the downwardly inclined portion 42c formed at the base of the outer periphery of the guide portion 42, deviation in the radial direction, that is, misalignment is prevented. That is, since the physical center line of the return spring 9 coincides with the center line of the valve body 51, the center line of the spring force of the return spring 9 is also not misaligned. As a result, the return spring 9 does not come into contact with the outer peripheral surface 42d of the guide portion 42 and the local uniformity of the spring force is not impaired. As a result, the valve body 51 is not inclined, the seating property is improved, and the operation of the temperature sensing valve is stabilized.

  When the amount of condensate flowing into the body 1 increases and the temperature of the fluid in the body 1 falls below a predetermined temperature, the amount of deformation in the vertical direction of the temperature-sensitive drive body 7 decreases, and the return coil spring 9 Extends, and the spring receiving member 8 moves upward. By moving the spring receiving member 8 upward, the collar 18 is pushed up by the spring receiving member 8, so that the valve stem 5 rises in the axial direction, and the valve body 51 that has blocked the valve opening moves upward from the valve opening 41 a. The valve port 41a is opened after being separated. Thereby, the condensate is discharged from the discharge port 1b through the valve port 41a and the outlet side communication hole 12 from the introduction hole 42a of the guide portion 42 shown in FIG.

  The present invention is not limited to the temperature control trap described in the above embodiment, and is also applicable to other temperature sensitive valves such as a temperature control valve that detects the temperature of the fluid and controls the opening of the valve. it can.

It is a longitudinal cross-sectional view which shows the temperature sensing valve concerning one Embodiment of this invention. It is a longitudinal cross-sectional view of the principal part of a temperature sensing valve. It is side surface sectional drawing which expands and shows the arrangement | positioning state of the lower end part of a return spring, and a guide part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body 1a Inlet 1b Outlet 4 Valve seat member 7 Temperature sensitive drive body 9 Returning spring 9b Lower end part 9ba Inner diameter edge 41 Main body 41a Valve port 41b Upper surface 42 Guide part 42a Introduction hole 42b Guide hole 42c Inclined part 51 Valve body θ Inclination angle

Claims (3)

A body having a fluid inlet and outlet;
A valve seat member having a valve opening;
A valve body that moves up and down to open and close the valve opening;
A temperature-sensitive driving body that drives the valve body in a valve closing direction according to the temperature of the fluid; and
A return spring for applying an elastic force in the valve opening direction to the valve body against the driving force of the temperature-sensitive drive body,
The valve seat member has a main body having the valve port, an introduction hole for introducing fluid into the valve port, and a guide hole for fitting and guiding the valve body to project upward from the upper surface of the main body. And
The return spring is concentrically with the guide portion and located radially outward of the outer peripheral surface thereof,
The lower end of the return spring is in contact with the upper surface of the main body of the valve seat member,
An inclined part is formed at the base part of the outer periphery of the guide part downwardly spreading downward,
A temperature-sensitive valve in which a lower end of the inclined portion coincides with an inner diameter edge of a lower end portion of the return spring.   The temperature sensitive valve according to claim 1, wherein an outer peripheral surface of the inclined portion is a conical surface.   The temperature-sensitive valve according to claim 2, wherein an inclination angle of the conical surface with respect to the upper surface is 50 to 70 °.

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