JP4829611B2 - Expansion valve - Google Patents

Description

  The present invention relates to an expansion valve used in a car air conditioner (a refrigeration cycle thereof), and more particularly to a temperature type expansion valve provided with a temperature-sensitive diaphragm device.

  Examples of this type of expansion valve include a fluid inlet, a valve chamber having a valve port (valve seat) with which the valve body contacts and separates, and a valve body (consisting of a ball and its support member). A spring chamber in which a valve-closing spring is urged in the closing direction, and a fluid outlet, and a valve body having a recess on the upper surface thereof, and a valve body attached to cover the recess of the valve body. A temperature-sensitive diaphragm device, and the diaphragm and the valve body are configured to open and close according to the behavior of the diaphragm of the temperature-sensitive diaphragm device (pressure change caused by temperature change of the enclosed gas). Three operating rods are arranged between them, and a guide insertion hole into which the three operating rods are slidably inserted is formed between the recess in the valve body and the spring chamber. is there.

JP-A-7-146033

  In the above-described expansion valve, three operating rods are loosely inserted into the guide insertion holes, respectively, and the three operating rods, the diaphragm, and the valve closing spring cooperate to drive the valve body to open and close. Therefore, there has been a problem that undesired vibration or abnormal noise occurs in the valve body or the like.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to open and close the valve body in cooperation with three operating rods, a diaphragm and a valve closing spring. Thus, an object of the present invention is to provide an expansion valve that can effectively suppress the occurrence of unwanted vibration and abnormal noise.

  In order to achieve the above object, the expansion valve according to the present invention basically includes a valve body provided with a valve chamber having a valve port with which the valve body contacts and separates, and the valve body for opening and closing the valve body. A temperature-sensitive diaphragm device attached to the main body, and a slidable arrangement between the diaphragm and the valve body in the valve main body in order to transmit the behavior of the diaphragm of the temperature-sensitive diaphragm device to the valve body. And three actuating bars.

In order to press the three operating rods radially outward, one ring-shaped spring member is arranged so as to be inscribed in the operating rods.

In a more specific and preferred embodiment, a fluid inlet, a valve chamber having a valve opening for contacting and separating the valve body, a spring chamber in which a valve closing spring for biasing the valve body in a closing direction is disposed, and a fluid outlet are provided. And a valve body provided with a recess on the upper surface side thereof, a temperature-sensitive diaphragm device attached so as to cover the recess of the valve body, and the valve according to the behavior of the diaphragm of the temperature-sensitive diaphragm device Three actuating rods disposed between the diaphragm and the valve body to open and close the body, and the three actuating members between the recess and the spring chamber in the valve body. Guide insertion holes into which the rods are slidably inserted are formed, and one ring-shaped spring member is inscribed in the three operating rods so as to be inscribed radially in order to press the three operating rods outward in the radial direction. Is distributed.

In a preferred embodiment, the three actuating bars are arranged at equal angular intervals on the same circumference.
In another preferred embodiment, the valve body includes a ball and a support member, and lower ends of the three operating rods are brought into contact with the support member.

  The ring-shaped spring member is preferably placed on the support member, and more preferably, a stepped surface portion and a small-diameter portion are formed at lower ends of the three operating rods, and the ring-shaped spring member is supported by the support member. It is clamped between the member and the stepped surface portion.

  In another preferred embodiment, the upper ends of the three operating rods are projected into the recess, and the ring-shaped spring member is disposed on the bottom surface of the recess.

  In another preferred embodiment, in order to limit the maximum lift amount of the valve body, a movable stopper abutting on the diaphragm is slidably disposed in the recess, and the movable stoppers are arranged on the three operating rods. The end face is brought into contact.

  Moreover, as said ring-shaped spring member, Preferably, a C-shaped ring spring, a mainspring spring, or a coil spring is used.

  In the expansion valve according to the present invention, since the ring-shaped spring member is arranged so as to be inscribed in the three operating rods, the three operating rods are pressed radially outward by the ring-shaped spring member, The pressing force increases the frictional force between the operating rod and the guide insertion hole. Therefore, since the sliding resistance of the operating rod increases, undesired vibrations and abnormal noises such as a valve body can be suppressed.

  Hereinafter, embodiments of an expansion valve of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a first embodiment of an expansion valve according to the present invention.
The illustrated expansion valve 1 includes a valve main body 10 made of brass or the like and a temperature-sensitive diaphragm device 30. The valve body 10 has a valve chamber 14 having a valve port (valve seat) 13 with which a valve body 15 composed of a fluid inlet (joint) 12, a ball 15 a and its support member 16 contacts and separates, and a valve body 15 in a closing direction. A spring chamber 17 in which an energizing valve closing spring 25 is arranged and a fluid outlet (joint) 18 are provided, and at the upper part thereof, a stepped recess 24 having a circular cross section of the upper surface opening is provided. In order to limit the maximum lift amount of the valve body 15, a disc-shaped movable stopper 27 is slidably inserted so as to contact a diaphragm 33 described later.

  A female thread portion 19 is provided between the spring chamber 17 of the valve body and the fluid outlet 18, and a nut 26 with a hexagonal hole 26 a for adjusting the set load of the valve closing spring 25 is screwed into the female thread portion 19. Yes.

  The support member 16 of the valve body 15 includes a valve rod 16a having a spherical seat for receiving a ball 15a at the upper end portion, and a support body 16b with a hook-like portion 16c into which the valve rod 16a is press-fitted and fixed. The valve closing spring 25 is mounted between the hook-shaped portion 16c and the adjusting nut 26.

  On the other hand, the temperature sensing diaphragm device 30 is configured such that the diaphragm 33 disposed so as to cover the concave portion 24 and the outer peripheral edge of the diaphragm 33 can be clamped and fixed to the upper surface portion of the valve body 10. And a lid member 32 having a hemispherical convex portion. The outer peripheral edge of the lid member 32 is caulked and fixed by a caulking portion 34 provided at the upper end portion of the valve body 10, and a solder layer 36 is formed on the upper surface portion of the lid member 32 including the caulking fixing portion. ing. The solder layer 36 is formed by heating the valve body 10 or the lid member 32 and melting the solder material in a state where a solder material (lead-free solder or the like) is placed on the upper surface of the lid member 32 (accordingly, therefore). The upper surface of the solder layer 36 is a horizontal flat surface). By this solder layer 36, the outside (atmosphere) and the inside of the valve body 10 and the diaphragm device 30 are sealed off.

  In addition, a temperature sensitive room (diaphragm chamber) 35 that is a sealed space is defined between the lid member 32 and the diaphragm 33, and one end of a capillary tube 37 is inserted into the temperature sensitive room 35. For example, a temperature sensing cylinder is connected to the other end (not shown) of the capillary tube 37, and for example, the temperature of the refrigerant on the evaporator outlet side is sensed by this temperature sensing cylinder. A predetermined gas (for example, carbon dioxide) is enclosed in the temperature sensing chamber 35 (and the temperature sensing cylinder), and the diaphragm 33 swings up and down due to a pressure change caused by a temperature change of the sealed gas, and the behavior of the diaphragm 33 is changed. It is transmitted to the valve body 15 through the movable stopper 27 and the three operating rods 20.

  That is, in order to open and close the valve body 15 in accordance with the behavior of the diaphragm 33 of the temperature sensing diaphragm device 30 (pressure change caused by temperature change of the enclosed gas), the diaphragm 33 (the movable stopper 27 contacting the diaphragm 33) The three operating rods 20, 20, 20 are arranged between the valve body 15 and the valve body 15 (the support member 16).

  Specifically, the guide insertion holes 21 into which the three actuating rods 20, 20, 20 are slidably inserted between the recess 24 and the spring chamber 17 in the valve body 10 are equiangular on the same circumference. It is formed at intervals. The upper end portions of the three operating rods 20, 20, 20 are projected into the recess 24, and the upper end surfaces thereof are brought into contact with the movable stopper 24, so that the three operating rods 20, 20, 20 The lower end surface is brought into contact with the upper surface of the hook-shaped portion 16 c of the support member 16.

  Therefore, as shown in the figure, when the pressure in the greenhouse 25 increases from the closed state in which the valve body 15 (ball 15a) is in contact with the valve port (valve seat) 13, the urging force of the valve closing spring 25 is resisted. As a result, the diaphragm 33 is swung downward, and the movable stopper 27 and the three actuating rods 20, 20, 20 are pushed down. As a result, the valve body 15 (support member 16) is pushed down (lifted downward) and opened. I speak. Here, the maximum lift amount of the valve body 15 is limited by the movable stopper 27 (outward downward convex portion of the outer periphery thereof) contacting the stepped surface portion 24 a of the concave portion 24. When the pressure in the temperature sensing chamber 35 decreases (temperature decreases) from this open state, the urging force of the valve closing spring 25 raises the valve body 15, the three operating rods 20, 20, 20 and the movable stopper 27. In addition, the lift amount (opening degree) of the valve body 15 is reduced.

In addition to the above configuration, in the present embodiment, one ring-shaped spring member is inscribed in the three operating rods 20, 20, 20 so as to be inscribed in the radial direction so as to press the three operating rods 20, 20, 20 outward. A C-shaped ring spring 40 is disposed. Specifically, as shown in FIG. 2, a stepped surface portion (stepped portion) 20b and a small diameter portion 20a are formed at the lower ends of the three operating rods 20, 20, 20, and the C-shaped ring spring 40 is The support member 16 is sandwiched between the flange-shaped portion 16c and the stepped surface portion 20b.

  In the expansion valve 1 of the present embodiment configured as described above, the three operating rods 20, 20, 20, the diaphragm 33, and the valve closing spring 25 cooperate to drive the valve body 15 to open and close. The C-shaped ring spring 40 is disposed so as to be inscribed in the three operating rods 20, 20, 20. Therefore, the three operating rods 20, 20, 20 is pressed radially outward, and the pressing force increases the frictional force between the operating rods 20, 20, 20 and the guide insertion hole 21. Therefore, since the sliding resistance of the operating rods 20, 20, and 20 increases, undesired vibrations and abnormal sounds of the valve body 15 and the like can be suppressed.

  FIG. 3 is a longitudinal sectional view of a second embodiment of the expansion valve according to the present invention. The expansion valve 2 of the illustrated second embodiment has basically the same configuration as the expansion valve 1 of the first embodiment (the parts corresponding to the respective parts of the expansion valve 1 of the first embodiment or the same functional parts) The same reference numerals are given and their repeated explanation is omitted), and the arrangement site of the C-shaped ring spring 40 is different from that of the first embodiment.

  That is, in the present embodiment, as shown in FIG. 4, the C-shaped ring spring 40 is configured so that the three actuating rods 20, 20, 20 are pressed radially outward to press the three actuating rods 20, 20, 20. 20, 20 is arranged below the movable stopper 27 on the bottom surface 24 b of the concave portion 24 so as to be inscribed in the inside.

  Further, with the change in the arrangement position of the C-shaped ring spring 40, the movable stopper 27 is formed in a reverse tray shape in order to secure the arrangement space of the C-shaped ring spring 40.

Even under such a configuration, substantially the same effect as the first embodiment can be obtained.
In both of the above-described embodiments, the C-shaped ring spring 40 is used as the ring-shaped spring member, but a spring or a coil spring may be used instead.

The longitudinal cross-sectional view which shows 1st Embodiment of the expansion valve which concerns on this invention. The perspective view which shows the principal part (peripheral part of a ring-shaped spring member) of the expansion valve shown by FIG. The longitudinal cross-sectional view which shows 2nd Embodiment of the expansion valve which concerns on this invention. The perspective view which shows the principal part (peripheral part of a ring-shaped spring member) of the expansion valve shown by FIG.

Explanation of symbols

1, 2 ... Expansion valve 10 ... Valve body 13 ... Valve (valve seat)
DESCRIPTION OF SYMBOLS 14 ... Valve chamber 15 ... Valve body 15a ... Ball | bowl 16 ... Supporting member 16c ... Rod-shaped part 20 ... Actuating rod 20a ... Small diameter part 20b ... Step surface part 21 ... Guide insertion hole 24 ... Recessed part 24b ... Bottom part 26 ... Adjustment nut 27 ... Movable stopper 30 ... Temperature-sensing diaphragm device 32 ... Lid member 33 ... Diaphragm 35 ... Greenhouse 40 ... C-shaped ring spring (ring-shaped spring member)

Claims (9)

A valve body provided with a valve chamber having a valve port for contacting and separating the valve body, a temperature-sensing diaphragm device attached to the valve body to open and close the valve body, and a diaphragm of the temperature-sensing diaphragm device An expansion valve comprising three actuating rods slidably disposed between the diaphragm and the valve body in the valve body in order to transmit the behavior of the valve body to the valve body,
An expansion valve characterized in that one ring-shaped spring member is disposed so as to be inscribed in the three actuating rods so as to press the three actuating rods radially outward. There are provided a fluid inlet, a valve chamber having a valve port for contacting and separating the valve body, a spring chamber in which a valve closing spring for biasing the valve body in a closing direction is disposed, and a fluid outlet, and a recess is provided on the upper surface side thereof. In order to open and close the valve body according to the behavior of the diaphragm of the valve body provided, the temperature sensing diaphragm device attached so as to cover the concave portion of the valve body, and the temperature sensing diaphragm device, An expansion valve comprising three operating rods disposed between the diaphragm and the valve body,
Guide insertion holes into which the three operating rods are slidably inserted are formed between the concave portion and the spring chamber in the valve body, and the three operating rods are radially outward. An expansion valve characterized in that one ring-shaped spring member is arranged so as to be inscribed in the operating rods for pressing.   The expansion valve according to claim 1 or 2, wherein the three operating rods are arranged at equal angular intervals on the same circumference. The valve body is formed of a ball and the supporting member, any one of claims 1 to 3, characterized in that the lower end of said three actuating bar is brought into contact with the said support member The expansion valve described.   The expansion valve according to claim 4, wherein the ring-shaped spring member is placed on the support member.   6. The expansion according to claim 5, wherein a step surface portion and a small diameter portion are formed at lower ends of the three operating rods, and the ring-shaped spring member is sandwiched between the support member and the step surface portion. valve. 3. The expansion valve according to claim 2 , wherein upper ends of the three operating rods are protruded into the recess, and the ring-shaped spring member is disposed on a bottom surface of the recess. In order to limit the maximum lift amount of the valve body, a movable stopper that comes into contact with the diaphragm is slidably disposed in the recess, and the upper end surfaces of the three operating rods are brought into contact with the movable stopper. The expansion valve according to claim 2 or 7 , wherein the expansion valve is provided.   The expansion valve according to any one of claims 1 to 8, wherein a C-shaped ring spring, a spring, or a coil spring is used as the ring-shaped spring member.

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