JP4576076B2 - Expansion valve with integrated solenoid valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic valve-integrated expansion valve, and is suitable for use in, for example, a vehicle air conditioner in which a refrigeration cycle is provided on the front side and rear side of a vehicle interior.
[0002]
[Prior art]
Conventionally, as this kind of solenoid valve-integrated expansion valve, for example, those described in JP-A-10-73345 and JP-A-11-182983 are known.
These solenoid valve-integrated expansion valves include a throttle channel that decompresses and expands the high-pressure side refrigerant, a valve body that adjusts the opening of the throttle channel, a valve body operating mechanism that displaces the valve body, and a throttle channel. And an outlet refrigerant flow path for supplying the decompressed and expanded refrigerant to the evaporator, the outlet refrigerant flow path is opened and closed by the valve body of the solenoid valve, and when the valve body of the solenoid valve is closed, the solenoid valve Based on the refrigerant pressure between the valve element and the throttle channel, the diaphragm element that operates the valve element closes the valve element in the throttle channel.
[0003]
[Problems to be solved by the invention]
However, in the conventional solenoid valve-integrated expansion valve, when the solenoid valve is closed, the high-pressure side refrigerant is introduced to the lower side of the diaphragm constituting the diaphragm operating mechanism, so that the high-pressure side pressure of the refrigeration cycle acts. The diaphragm operating mechanism requires high strength. For this reason, the diaphragm is made of a high pressure resistant stainless steel, or the thickness of the housing of the diaphragm operating mechanism is increased.
Therefore, the conventional solenoid valve-integrated expansion valve has a problem of high cost and large size.
[0004]
The present invention has been made in view of such problems, and an object of the present invention is to provide an electromagnetic valve integrated expansion valve that does not introduce high-pressure refrigerant into the diaphragm operating mechanism when the electromagnetic valve is closed. It is to be.
[0005]
[Means for Solving the Problems]
To achieve the above object, the solenoid valve integral expansion valve according to the present invention includes a valve body, is formed in the valve body, an inlet refrigerant flow path that the high-pressure side refrigerant is introduced, formed in the valve body A valve chamber into which the refrigerant introduced from the inlet refrigerant channel flows, and an orifice member that is slidably provided in the valve chamber and forms a throttle channel that decompresses and expands the refrigerant that has flowed into the valve chamber ; , disposed on the downstream side of the orifice member, a spring for biasing said orifice member on the upstream side, is disposed on the upstream side of the orifice member, a valve body for adjusting the opening degree of the throttle channel, A valve body actuating mechanism that is provided in the valve body and displaces the valve body; an outlet refrigerant flow path that is formed in the valve body and that supplies the refrigerant decompressed and expanded in the throttle flow path to the evaporator; and The outlet refrigerant flow is integrated with the valve body. And an electromagnetic valve for opening and closing the, when opening the solenoid valve, the orifice member by the pressure of the high-pressure side refrigerant moves to the downstream side against the spring force of the spring forming the throttle channel, When the electromagnetic valve is closed , the orifice member is moved so as to contact the valve body by the spring force of the spring to close the throttle passage.
[0006]
The solenoid valve-integrated expansion valve according to the present invention is characterized in that the orifice member includes an O-ring that seals between the orifice member and the inner wall of the valve chamber .
[0007]
Furthermore, the solenoid valve-integrated expansion valve according to the present invention is characterized in that the orifice member has a minute passage communicating the upstream side and the downstream side of the orifice member .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view of a solenoid valve-integrated expansion valve according to an embodiment of the present invention cut along a plane including a refrigerant passage, FIG. 2 is a cross-sectional view corresponding to the right side of FIG. ) And FIG. 3B are enlarged views of the main part of FIG.
An expansion valve integrated with an electromagnetic valve denoted as a whole by reference numeral 1 has a substantially prismatic valve body 10. The lower part of the valve body 10 has an inlet refrigerant passage 12 to which high-pressure refrigerant from the compressor side of the refrigeration cycle is supplied. The inlet refrigerant passage 12 communicates with a valve chamber 14 formed inside the valve body 10. Is done. A ball-shaped valve body 40 is supported in the valve chamber 14 by a spring 32 via a support member 34.
[0009]
Furthermore, a disc-shaped orifice member 15 having a predetermined thickness, which is formed so that the valve seat 15 ′ is disposed to face the valve body 40, is provided. The orifice member 15 is formed in a substantially disk shape having a predetermined thickness using, for example, a stainless material, and forms a throttle channel 19 with the valve body 40 and has a center hole 17. Furthermore, an O-ring 16 for sealing is attached to the orifice member 15 in the thickness direction, and is provided so as to be slidable in contact with the inner wall 14 ′ of the valve chamber 14. Reference numeral 18 denotes a spring disposed on the downstream side of the orifice member 15. That is, the spring 18 is disposed in the large-diameter portion 13 formed coaxially with the inner hole 11 through which the temperature sensing rod 80 penetrating the center hole 17 and having the lower end abutting the valve body 40 is slidably fitted. Between the step portion 13 ′ extending in the radial direction of the large diameter portion 13 and the orifice member 15, the orifice member 15 is supported, and the valve seat 15 ′ of the orifice member 15 is closed so as to contact the valve body 40. Acts as a valve spring force.
[0010]
A nut member 30 is screwed into the opening of the valve chamber 14 and sealed. By screwing the nut member 30, the spring 32 is preloaded and supports the valve body 40 via the support member 34 with a predetermined spring force. A seal member 36 is attached to the nut member 30 to seal the valve chamber 14.
The refrigerant in the valve chamber 14 is decompressed and expanded through the throttle passage 19 between the valve body 40 and the valve seat 15 ′ and flows out to the outlet refrigerant passage 20. The refrigerant from the outlet refrigerant flow path 20 is sent out to an evaporator (not shown) through the outlet hole 22.
[0011]
The refrigerant returned from the evaporator passes through a passage 50 provided in the upper part of the valve body 10 and is returned to a compressor (not shown). The refrigerant in the passage 50 is sent through the gap 52 toward the power element 60 that is a diaphragm operating mechanism that serves as a valve operating mechanism that drives a valve attached to the upper portion of the valve body 10.
The power element 60 has a housing 62 that is attached to the valve body 10 with a screw portion 64. Further, the diaphragm 70 is sandwiched and welded between the casing members 621 and 622 constituting the housing 62, and the upper chamber 72 a and the lower chamber 72 b are partitioned by the diaphragm 70. A working fluid is sealed in the upper chamber 72a, and the plug 66 is sealed.
[0012]
The diaphragm 70 is supported by a stopper 74. The stopper 74 is formed integrally with or separately from the temperature sensing rod 80 that drives the valve body 40. In FIG. 1 and FIG. 2, it is formed as a separate body, and its tip is fitted to the stopper 74. The temperature sensing rod 80 has a function of transmitting the temperature of the refrigerant flowing in the passage 50 to the power element 60.
[0013]
Thus, the temperature sensing rod 80 is slidably fitted into a stepped inner hole 11 formed in the valve body 10, and the lower end of the temperature sensing rod 80 passes through the center hole 17 of the orifice member 15 to the valve body 40. It abuts and urges the valve body 40 in a direction away from the valve seat 15 ′. Further, the temperature sensing rod 80 has a small diameter portion 82 formed in the lower portion thereof, and prevents communication between the outlet refrigerant passage 20 and the passage 50 in the bottomed small diameter portion 81 formed coaxially with the inner hole 11. An O-ring 86 is provided as a sealing member.
[0014]
Since the expansion valve 1 is configured as described above, the temperature sensing rod 80 is driven by the operating position of the diaphragm 70 set in accordance with the pressure and temperature of the refrigerant that flows out of the evaporator and passes through the passage 50. Thus, the gap of the throttle channel 19 between the valve body 40 and the valve seat 15 ′ is adjusted.
[0015]
Therefore, when the heat load of the evaporator is large, the gap between the valve body 40 and the valve seat 15 is large, and a large amount of refrigerant is supplied to the evaporator. Conversely, when the heat load is small, the flow rate of the refrigerant is small. .
[0016]
As shown in FIG. 2, the electromagnetic valve 100 is attached to the side surface of the valve body 10.
The electromagnetic valve 100 includes a casing 110 and an attachment member 140 connected to the casing 110, and the attachment member 140 is attached to a bottomed opening 26 formed in the valve body 10 via a screw portion. The bottomed opening 26 communicates with the valve chamber 14 via the large diameter portion 13.
[0017]
Therefore, the refrigerant supplied to the valve chamber 14 is also introduced into the bottomed opening 26 via the large diameter portion 13, and a passage is formed that flows into the outlet refrigerant flow path 20 when the solenoid valve 100 is opened. The
[0018]
The solenoid valve 100 has a coil 120 in a casing 110 and is supplied with power via a cord 122. A cylinder 124 is disposed at the center of the casing 110, and a plunger 130 is slidably inserted. A stopper 132 is fixed to the outside of the cylinder 124 with screws 136. The stopper 132 always urges the plunger 130 in a direction away from the stopper 132 via the spring 134.
A pilot valve body 150 is slidably disposed at the tip of the plunger 130. The pilot valve body 150 has a valve hole 152 at the center.
[0019]
A pipe-like conduit 28 is provided at the center of the bottomed opening 26. A passage 27 having an inner diameter of the conduit 28 communicates the bottomed opening 26 and the outlet refrigerant flow path 20 of the valve body 10.
The pilot valve body 150 is normally pressed by the plunger 130, and the valve hole 152 of the pilot valve body 150 is closed by the tip of the plunger 130. The refrigerant of the bottomed opening 26 is introduced into the back pressure chamber 160 outside the pilot valve body 150, and the pilot valve body 150 is pressed against the opening of the conduit 28 by the back pressure, so that the passage 27. Close.
[0020]
In the solenoid valve 100 configured as described above, when the coil 120 of the solenoid valve 100 is energized, the plunger 130 is pulled back to the stopper 132 side by the magnetic force of the coil 120. When the tip of the plunger 130 is separated from the valve hole 152 of the pilot valve body 150, the valve hole 152 is opened, and the refrigerant in the back pressure chamber 160 passes through the valve hole 152 and is introduced into the passage 27 of the conduit 28. Is reduced. As a result, the pilot valve body 150 is separated from the tip of the conduit 28, the electromagnetic valve 100 is opened, and the refrigerant in the bottomed opening 26 flows toward the outlet refrigerant flow path 20 side.
[0021]
That is, high-pressure refrigerant is supplied from the inlet refrigerant flow path 12 to the valve chamber 14, and the orifice member 15 is slid by being pushed downstream of the high-pressure refrigerant, that is, upward, as shown in FIG. The spring 18 is pushed upward, a throttle channel 19 is formed between the valve body 40 and the valve seat 15 ', and the high-pressure refrigerant is adiabatically expanded. As a result, the refrigerant flows into the bottomed opening 26 through the large-diameter portion 13 and flows to the outlet refrigerant flow path 20 side through the passage 27.
[0022]
On the contrary, the power supply to the coil 120 is cut off, the tip of the plunger 130 is seated in the valve hole 152 of the valve body 150 by the spring force of the spring 134, and the valve hole 152 is closed. Then, the refrigerant in the large-diameter portion 13 is introduced into the back pressure chamber 160 through the bottomed opening 26. Therefore, the tip of the plunger 130 is seated on the valve hole 152 to close the valve hole 152, and the valve body 150 is seated on the end face of the conduit 28 to close the passage 27. Thereby, the solenoid valve 20 returns to the closed state.
[0023]
As a result, as shown in FIG. 3B, the flow of the high-pressure refrigerant supplied to the valve chamber 14 disappears, and the pressure in the valve chamber 14 and the pressure in the large-diameter portion 13 are equalized, resulting in a large pressure. The spring force of the spring 18 disposed in the diameter portion 13 becomes a valve closing spring force, and the orifice member 15 is pushed and slid downward, so that the valve seat 15 ′ of the orifice member 15 contacts the ball-shaped valve body 40. Then, the ball-shaped valve body 40 is seated on the valve seat 15 ′, the valve body 40 is closed, and the throttle channel 19 is closed.
[0024]
Therefore, in order to bring the valve body 40 into a closed state, the valve closing spring force of the spring 18 that supports the orifice member 15 is obtained without introducing high-pressure refrigerant into the power element 60 that is a diaphragm operating mechanism that drives the valve body. Therefore, it is not necessary to configure the power element 60 with high strength.
[0025]
4 (A) and 4 (B) are cross-sectional views showing the main parts of another embodiment of the solenoid valve-integrated expansion valve according to the present invention, and FIG. 3 (A) and FIG. 3 (B), respectively. ), The orifice member 15 is provided with a bleed port 15 ″ in the axial direction thereof.
[0026]
4A and 4B, the solenoid valve 100 shown in FIG. 4B is closed, and the pressure in the valve chamber 14 and the pressure in the large-diameter portion 13 are reduced. When the pressure is equalized, it is provided in order to quickly perform the pressure equalization, and the high-pressure refrigerant flows into the large-diameter portion 13 from the valve chamber 14 through the bleed port 15 ″, and the pressure equalization is performed quickly. Accordingly, the downward sliding of the orifice member 15 in the embodiment of FIG. 4B is performed more quickly than in the embodiment of FIG. Thus, the transition to the valve closing state is performed quickly. Furthermore, the bleed port 15 '' is a minute through hole that does not adversely affect the adjustment of the refrigerant flow rate when the electromagnetic valve 100 shown in FIG. 4A is opened.
[0027]
In the above embodiment, the case where the orifice member 15 includes the O-ring 16 has been described. However, in the present invention, the O-ring 16 is omitted, and the inner wall 14 ′ of the valve chamber 14, the orifice member 15, and the like. Of course, they may be brought into direct contact with each other.
[0028]
【The invention's effect】
According to the solenoid valve-integrated expansion valve of the present invention, since the high-pressure refrigerant is not introduced into the diaphragm operating mechanism that drives the valve body, it is not necessary to increase the strength of the diaphragm operating mechanism, and the cost is reduced. An expansion valve integrated with a solenoid valve is obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of an expansion valve integrated with a solenoid valve of the present invention.
FIG. 2 is a right sectional view of FIG.
FIG. 3 is an enlarged view of a main part of FIG.
FIG. 4 is an enlarged view of a main part showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Expansion valve 2 Valve body 12 Inlet refrigerant path 14 Valve chamber 15 Orifice member 15 'Valve seat 15''Bleed port 18 Spring 20 Outlet refrigerant path 40 Ball-shaped valve body 60 Power element 62 Housing 70 Diaphragm 74 Stopper 80 Temperature sensing rod 100 Solenoid valve 110 Casing 120 Coil 130 Plunger 150 Pilot valve body

Claims (3)

A valve body, an inlet refrigerant passage formed in the valve body and into which the high-pressure refrigerant is introduced, a valve chamber formed in the valve body and into which the refrigerant introduced from the inlet refrigerant passage flows; slidably mounted to the valve chamber, and an orifice member that forms a throttle channel for decompressing and expanding the refrigerant flowing into the valve chamber, is disposed on the downstream side of the orifice member, the orifice member on the upstream side a spring for biasing is arranged on the upstream side of the orifice member, a valve body for adjusting the opening degree of the throttle channel is provided in the valve body, a valve element operating mechanism for displacing the valve body, An outlet refrigerant channel that is formed in the valve body and supplies the refrigerant decompressed and expanded in the throttle channel to the evaporator, and an electromagnetic valve that is integrated with the valve body and opens and closes the outlet refrigerant channel It equipped with a door,
When the solenoid valve is opened, the orifice member moves downstream against the spring force of the spring due to the pressure of the high-pressure side refrigerant to form the throttle channel, and when the solenoid valve is closed , An expansion valve integrated with a solenoid valve, wherein an orifice member is moved so as to contact the valve body by a spring force of the spring to close the throttle passage. 2. The solenoid valve-integrated expansion valve according to claim 1, wherein the orifice member includes an O-ring that seals between the orifice member and an inner wall of the valve chamber . The solenoid valve-integrated expansion valve according to claim 1 or 2, wherein the orifice member has a minute passage communicating the upstream side and the downstream side of the orifice member .

Images