JP2000346494A - Temperature type expansion valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a member of a temperature type expansion valve equipped with a refrigerating cycle such as an air conditioner or the like. SOLUTION: The temperature type expansion valve 100 comprises a valve chamber 122 communicating with a high-pressure refrigerant inlet 120 in a body 110 made of an aluminum alloy. In this case, a refrigerant controlled for its flow rate by a valve disc 190 is supplied from a first passage 130 to an evaporator side. The refrigerant returned from the evaporator is directed toward a compressor side through a second passage 140. A diaphragm 160 in a power element 150 drives a rod-like valve disc driving member 180 in response to a pressure and a temperature of the refrigerant. A rubber member 220 for sealing a hole 181 of the body 110 is integrally baked and connected to a recess 182 of the member 180.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature type expansion valve for a refrigerant used in a refrigeration cycle of an air conditioner, a refrigeration system or the like.

[0002]

2. Description of the Related Art FIG. 5 is a longitudinal sectional view showing a state in which a box type expansion valve which has been widely used in the past is arranged in a refrigeration cycle of an air conditioner of an automobile or the like. In FIG. 5, an expansion valve 10 has a prismatic valve body 30 made of, for example, aluminum, a condenser 5 and an evaporator 8 in a refrigeration cycle 11.
Passage 32 through which the refrigerant flows toward the compressor 4 and second passage 3 through which the refrigerant flows from the evaporator 8 to the compressor 4
4 are formed on the valve body 30 so as to be vertically separated from each other. Further, an orifice 32a and a valve chamber 35 provided in the first passage 32, and a spherical valve body 32 disposed upstream of the passage 32 for controlling the amount of refrigerant passing through the orifice 32a.
b and the valve element 32b in the direction of the orifice 32a.
c has an adjusting screw 39 for the spring 32d which presses through the c. The adjusting screw 39 is screwed from the lower end face of the valve body 30 into a mounting hole 30a communicating with the valve chamber 35 of the first passage 32 so as to be able to advance and retreat. An O-ring 39a is mounted on the adjusting screw 39, and the valve body 30 And the airtight state is secured. The adjusting screw 39 and the pressing spring 32d make the valve body 32b
Of the orifice 32a with respect to the orifice 32a is adjusted.

[0003] Reference numeral 321 denotes an inlet port through which the refrigerant sent out from the receiver 6 and flowing toward the evaporator 8 flows, and the valve chamber 35 is continuous with the inlet port 321.
322 is an outlet port for the refrigerant flowing into the evaporator 8. A driving force is applied to the valve body 30 in accordance with the outlet temperature of the evaporator 8 to the valve body 32b, and the orifice 32
A hole 37 having a smaller diameter for opening and closing a, and a hole 38 having a larger diameter than the hole 37 are formed coaxially with the orifice 32 a through the second passage 34, and are provided at the upper end of the valve body 30. A screw hole 361 to which the power element portion 36 serving as a heat sensitive portion is fixed is formed.

The power element section 36 is provided with a stainless steel diaphragm 36a and an upper pressure working chamber 36b which is provided in close contact with each other with the diaphragm 36a therebetween by welding and forms two airtight temperature sensing chambers above and below the diaphragm. Upper cover 3 which constitutes each lower pressure working chamber 36c
6d, a lower cover 36h, and a sealing tube 36i for sealing a predetermined refrigerant serving as a diaphragm driving fluid in the upper pressure working chamber 36b. The lower cover 36h is screwed into the screw hole 361 via the packing 40. Lower pressure working chamber 36c
Is connected to the second passage 34 via a pressure equalizing hole 36e formed concentrically with the center line of the orifice 32a. Refrigerant vapor from the evaporator 8 flows through the second passage 34, and the passage 34 serves as a passage for a gas-phase refrigerant, and the pressure of the refrigerant vapor is applied to the lower pressure working chamber 36c via the equalizing hole 36e. . In addition, 342 is an inlet port into which the refrigerant sent from the evaporator 8 enters, and 341 is an outlet port as an outlet of the refrigerant sent to the compressor 4.

Further, the lower pressure working chamber 36c has a large-diameter dish-shaped top portion 37g in contact with the center of the lower surface of the diaphragm 36a, and the large-diameter hole 38 penetrates through the second passage 34. And slidably disposed therein, to transmit the refrigerant outlet temperature of the evaporator 8 to the lower pressure operating chamber 36c, and also to transmit the refrigerant pressure to the upper pressure operating chamber 36b and the lower pressure operating chamber 36c.
The aluminum temperature sensing rod 3 that slides in the large diameter 38 to provide a driving force in accordance with the displacement of the diaphragm 36a due to the pressure difference
6f and a smaller diameter than the temperature sensing rod 36f which is slidably disposed in the small diameter hole 37 and presses the valve body 32b against the elastic force of the urging means 32d according to the displacement of the temperature sensing rod 36f. Of the temperature sensing rod 36f.
7g contacts the lower surface of the diaphragm 36a as a receiving portion of the diaphragm 36a, the lower end of the temperature sensing rod 36f contacts the upper end of the operating rod 37f, and the lower end of the operating rod 37f is
b, and the valve element driving member is constituted by the temperature sensing rod 36f and the operating rod 37f.

Therefore, the orifice 32 of the first passage 32 is inserted into the pressure equalizing hole 36e from the lower surface of the diaphragm 36a.
The valve element driving member extending to a is concentrically arranged. The portion 37e of the operating rod 37f is formed thinner than the inner diameter of the orifice 32a, passes through the inside of the orifice 32a, and the refrigerant passes through the inside of the orifice 32a. Further, the temperature sensing rod 36f has an O as a sealing member for ensuring airtightness between the first passage 32 and the second passage 34.
A ring 36g is provided.

A known diaphragm driving fluid is filled in the pressure operating chamber 36b above the pressure operating housing 36d, and a second passage 34 is provided in the diaphragm driving fluid.
And the valve drive member and the diaphragm 32a exposed to the pressure equalizing hole 36e communicating with the second passage 34,
The heat of the refrigerant from the refrigerant outlet of the evaporator 8 flowing through the second passage 34 is transmitted.

[0008] The diaphragm driving fluid in the upper pressure working chamber 36b gasifies in response to the transferred heat, and applies pressure to the upper surface of the diaphragm 36a. The diaphragm 36a is displaced up and down due to the difference between the pressure of the diaphragm driving gas applied to the upper surface and the pressure applied to the lower surface of the diaphragm 36a. The change of the center of the diaphragm 36a in the vertical direction is controlled by the valve element
b to move the valve body 32b toward or away from the valve seat of the orifice 32a. As a result, the flow rate of the refrigerant is controlled.

That is, since the temperature of the low-pressure gas-phase refrigerant sent from the outlet side of the evaporator 8, that is, from the evaporator, is transmitted to the upper pressure working chamber 36b, the pressure of the upper pressure working chamber 36b changes according to the temperature. Evaporator 8
Outlet temperature rises. That is, when the heat load of the evaporator increases, the pressure of the upper pressure working chamber 86b increases,
Accordingly, the temperature sensing rod 36f, that is, the valve body driving member is driven downward to lower the valve body 32b, so that the orifice 32a
The degree of opening increases. Thus, the supply amount of the refrigerant to the evaporator 8 increases, and the temperature of the evaporator 8 decreases. Conversely, the temperature of the refrigerant that can be sent out from the evaporator 8 decreases. That is, when the heat load of the evaporator decreases, the valve element 32b is driven in the opposite direction to the above, the opening degree of the orifice 32a decreases, the supply amount of the refrigerant to the evaporator decreases, and the temperature of the evaporator 8 increases. .

In such a conventional thermal expansion valve, the temperature sensing rod 36f is a member having a relatively large diameter, and the member and the operating rod constitute a valve body driving member. Thus, there is a conventional thermal expansion valve in which the valve element driving member is formed of a small-diameter rod member. A conventional thermal expansion valve using this rod member is shown in FIG. The operation of the expansion valve shown in FIG. 6 is the same as that of the expansion valve shown in FIG. 5, the same reference numerals as those in FIG. 5 indicate the same or equivalent parts, and FIG.
6g is different. That is, a large-diameter hole 38 is provided between the first passage 32 and the second passage 34, and the small-diameter rod-shaped rod member 316 is slidably inserted into the hole 38.
Transmits the operation of the diaphragm 36a to the valve body 32b.

A temperature sensing portion 318 having a temperature sensing mechanism has a temperature sensing rod 361f and a diaphragm 36a in contact with its surface.
Large-diameter stopper portion 3 serving as a receiving portion for diaphragm 36a
12 and a large diameter portion 314 in which one end surface abuts against the back surface of the stopper portion 312 and the center portion of the other end surface is formed in a projection 315 and is slidably inserted into the lower pressure working chamber 36c.
One end face is fitted inside the protruding portion 315 of the large diameter portion 314, and the other end face is in contact with the valve body 32b via a portion 371f corresponding to an operating rod, and is a continuous rod member 316. Consists of The temperature sensing rod 361f constituting the rod member 316 is exposed in the second passage, and heat from the refrigerant vapor is transmitted.

The rod-shaped member, that is, the rod member 316, which is the temperature sensing rod 361f, is driven across the passage 34 in accordance with the displacement of the diaphragm 36a of the power element 36 so as to be able to advance and retreat. Passage 321
A clearance (gap) communicating between the rod portion 3 and the passage 34 is formed.
An O-ring 40 is disposed in the large-diameter hole 38 so that the O-ring exists between the two passages, and the O-ring 40 is elongated by the coil spring 32 d and the refrigerant pressure in the passage 321. A push nut 41 as a detent nut is in contact with the O-ring 40 and is disposed in the large-diameter hole 38 so as not to move by receiving a force acting in the direction (the direction in which the power element portion 36 exists). Is attached to the rod part 316.

In the conventional temperature type expansion valve shown in FIGS. 5 and 6, it is a matter of course that the diaphragm driving fluid may be sealed using a plug instead of the sealing tube 36i.

[0014]

In the above-mentioned conventional thermal expansion valve, the airtightness between the first passage through which the refrigerant flows toward the evaporator and the second passage through which the refrigerant flows from the evaporator to the compressor is ensured. An O-ring or an O-ring and a retaining ring are used as a sealing member for the sealing. For this reason, in the temperature type expansion valve in FIG. 5, it is necessary to attach an O-ring which is a separate seal member to the valve element driving member, and the O-ring is troublesome to attach. In addition, there is a problem that the valve body driving member must be incorporated in the valve body, which requires an assembling man-hour.
In the temperature type expansion valve, there is a problem that a plurality of parts such as an O-ring and a snap ring are required, parts costs are required, the number of assembling steps is greatly increased, and assembling costs are also increased.

The present invention has been made in order to solve such a problem. It is an object of the present invention to simplify the assembling, greatly reduce the number of assembling steps, and reduce the assembling cost. It is to provide a greatly reduced temperature type expansion valve.

[0016]

In order to achieve the above object,
In the motor-operated valve according to the present invention, the first passage through which the refrigerant flowing toward the evaporator passes and the second passage through which the refrigerant flowing from the evaporator toward the compressor passes are formed in the valve body, and the refrigerant in the second passage is formed. A temperature type expansion valve for controlling a flow rate of refrigerant flowing into the evaporator by driving a valve element in the valve body by a valve element driving member in accordance with the temperature of the first element and sealing between the first and second passages. It is characterized in that a seal member is provided in advance on a sliding portion of the valve element driving member or the valve element driving member in the valve body.

[0017] An electric valve according to the present invention comprises a valve body having a first passage through which a refrigerant flows toward an evaporator and a second passage through which a refrigerant flows from the evaporator to a compressor; and a power supply provided in the valve body. A rod-shaped member that drives a valve body that controls a valve opening degree by displacement of a diaphragm in an element portion, and a seal member that seals between the passages is provided in advance in the rod-shaped member. Features.

Further, in a preferred specific embodiment of the motor-operated valve according to the present invention, the seal member provided on the rod-shaped member is a rubber material fixed by baking.

The motor-operated valve according to the present invention includes a valve body having a first passage through which a liquid refrigerant flows toward an evaporator, a second passage through which a gas-phase refrigerant flows from the evaporator to a compressor, and the first valve. An orifice provided in the passage, a valve body for adjusting the amount of refrigerant passing through the orifice, a power element provided on the valve body having a diaphragm that senses and displaces the temperature of the gas-phase refrigerant, And a rod-shaped member having a temperature-sensitive rod function for driving the valve body by displacement of the diaphragm, wherein the rod-shaped member is slidably inserted into a hole existing between the first and second passages. In addition to the above, a seal member is provided in advance on the inner surface of the hole.

As described above, the temperature type expansion valve according to the present invention is provided with the sealing member in advance in the rod-shaped member serving as the temperature sensing portion or the valve body in which the rod-shaped member slides. Can be reduced, and a seal between passages that can reduce the assembly cost can be realized. Furthermore, the passage surface formed in the valve body can be sealed using a minimum number of parts.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a thermal expansion valve according to an embodiment of the present invention. FIG. 1 is a sectional view of the thermal expansion valve of the present invention, and FIG. 2 is a right side view of FIG. The thermal expansion valve according to the present embodiment, which is generally denoted by reference numeral 100, has a substantially prismatic valve body 110, and its operation is the same as that of the conventional expansion valve shown in FIG. The valve body 110 is manufactured by subjecting a material obtained by, for example, hollow extrusion molding of an aluminum alloy to machining.

A high-pressure refrigerant inlet 120 formed in the valve body into which the high-pressure refrigerant flows from a receiver (not shown) is connected to a valve chamber 122 through a small-diameter hole 121. Valve room 12
2 is connected to the first refrigerant passage 130 through the orifice 126.
Is communicated to. In the valve chamber 122, a ball-shaped valve element 1 is provided.
90 are provided. The valve body 190 is supported by a support member 202, and the support member 202 urges the valve body 190 toward a valve seat of the orifice 126 via a spring 200. The spring 200 is supported by a nut member 204 that seals the valve chamber 122.

The refrigerant flowing out of the first refrigerant passage 130 is supplied to an evaporator (not shown) and exchanges heat with the outside air. The refrigerant returned from the evaporator flows through a second refrigerant passage 140 provided in the valve body 110 to a circuit of a compressor and a condenser (not shown) constituting the refrigerant system.

The valve element driving member 180 penetrating through the second refrigerant passage 140 in the diameter direction is a rod member, that is, a small-diameter rod-shaped member, and the upper end portion thereof has a power element portion 15.
Stopper 17 serving as a receiving portion of diaphragm 160 inside 0
Locked to zero. The lower end of the valve drive member 180 is the valve 1
90, and urges the valve body 190 in a direction away from the valve seat of the orifice 126.

A power element 150 is fixed to the upper part of the valve element 110 using a screw 156. A diaphragm 160 is sandwiched in the power element 150, an upper pressure space 152, which is a chamber above the diaphragm 160, is filled with a working gas, and a stopper 170 is provided in a lower pressure space 153, which is a lower chamber. It is slidably disposed and sealed by a sealing member 154 that is a plug.

The pressure of the refrigerant flowing through the second refrigerant passage 140 is received by the lower surface of the stopper 170, and the temperature of the refrigerant is transmitted through the valve driving member 180 and the stopper 170 to the upper pressure space 152 of the power element 150. Transmitted to the side. The opening of the valve element 190 between the valve seat 126 and the stopper 170 is adjusted via the stopper 170 and the valve element driving member 180 in accordance with the operation of the diaphragm 160 which receives the gas pressure in the upper pressure space 152, and the necessary degree is adjusted. An amount of refrigerant is supplied to the evaporator. In FIG. 2, reference numeral 114 denotes an outer side surface with a reduced width dimension.

Thus, the valve element driving member 1 which is a rod-shaped member
80 slides in the valve body 110, but the first refrigerant passage 1
In order to prevent the communication between the second coolant passage 140 and the second coolant passage 140, the seal member is arranged in the large-diameter hole 181 formed between the first and second passages formed in the valve body 110. As shown in FIG. 3, a rubber member 220 such as NBR (acrylonitrile / butadiene rubber) or HNBR (hydrogenated acrylonitrile / butadiene rubber) is mounted on the outer surface of the member 180 in advance as shown in FIG. This rubber material 220 is used as the valve body driving member 180.
For example, it is baked on a stainless steel material with a diameter of 2.4 mm,
It is previously installed on the valve body driving member 180. That is, a concave portion 182 provided at a depth of, for example, 0.05 mm is formed in the valve body driving member 180, and the concave portion 182 is formed.
To fix the rubber material 220 with an adhesive, or fix the rubber material by pressing without using an adhesive,
By using the upper mold and the lower mold, for example, 175 ° C. to 18
At a temperature of 0 ° C., the rubber material is baked and firmly mounted.

As described above, since the sealing member 220 is mounted on the valve body driving member 180 in advance, by incorporating the valve body driving member 180 into the large-diameter hole 181 formed in the valve body 110, Inevitably, the seal between the first and second passages is realized, so that the expansion valve 100 can be assembled, the number of assembly steps can be reduced, and the parts cost and the assembly cost can be reduced.

In the above description, a case has been described in which the sealing member is provided in advance in the valve body driving member, which is the temperature sensing part. However, the present invention is not limited to this, and the sliding of the valve body driving member in the valve body is performed. The present invention can also be applied to a case where a sealing material is provided in advance in a portion.

FIG. 4 is a cross-sectional view showing another embodiment of the present invention in that case. FIG. 4 is different from FIG. 3 only in the configuration in which the sealing material is mounted, and the other basic configuration and operation are the same. Since they are the same, in FIG.
Valve body 110, large diameter hole 18 formed in valve body 110
Only 1 'and the sealing material 230 are shown.

In the figure, the above-mentioned rubber material is previously provided as a sealing material 230 in a concave groove formed on the inner surface of the large-diameter hole 181 ', and the sealing material 230 is mounted in the large-diameter hole 181'. In this state, the valve member driving member 180 ', which is a temperature sensing portion, is incorporated into the valve body 110, so that the sealing member 230 is attached to the outer surface of the valve member driving member 180'. The expansion valve that achieves the seal between the two passages can be assembled. Therefore, since the sealing member is provided in advance on the sliding portion of the valve body driving member formed in the valve body, the number of assembly steps and the assembly cost can be reduced.

[0032]

As described above, according to the present invention, the temperature expansion valve is assembled with the sealing member provided in advance on the valve driving member or the sliding portion of the valve driving member, which is the temperature sensing portion. Can reduce the number of assembly steps,
Assembly cost can be reduced. In addition, the seal between the passages in the valve body can be realized with the minimum number of parts, and the number of assembling steps can be reduced, so that a significant reduction in assembling cost can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of an expansion valve according to the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is an explanatory diagram of a main part.

FIG. 4 is an explanatory diagram of a main part.

FIG. 5 is a cross-sectional view of a conventional expansion valve.

FIG. 6 is a sectional view of a conventional expansion valve.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 expansion valve 110 valve main body 120 high-pressure refrigerant inlet 130 first refrigerant passage 140 second refrigerant passage 150 power element 160 diaphragm 180 valve body driving member 181 hole 190 valve body 220 rubber material

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor: Kondo Yano 7-17-24, Todoroki, Setagaya-ku, Tokyo F-term inside Fuji Machine Co., Ltd. 3H052 AA01 BA26 CD01 EA01 EA04 EA11 3H057 AA04 BB38 CC06 DD04 EE03 FA22 FC05 HH02 HH18

Claims (4)

[Claims] A first passage through which a refrigerant flowing toward an evaporator passes and a second passage through which a refrigerant flowing from the evaporator toward a compressor passes are formed in a valve body. Accordingly, in a temperature-type expansion valve that controls a flow rate of refrigerant flowing into the evaporator by driving a valve element in the valve body by a valve element driving member, a seal member that seals between the first and second passages is provided. A temperature-type expansion valve, which is provided in advance in a sliding portion of the valve body driving member or the valve body driving member in the valve body. 2. A valve body having a first passage through which a refrigerant flows toward an evaporator and a second passage through which a refrigerant flows from the evaporator toward a compressor, and a displacement of a diaphragm in a power element portion provided in the valve body. A temperature-type expansion valve comprising a rod-shaped member for driving a valve body for controlling a valve opening, wherein a seal member for sealing between the passages is provided in advance in the rod-shaped member. 3. The thermal expansion valve according to claim 1, wherein the sealing member provided on the rod-shaped member is a rubber material fixed by baking. 4. A first passage through which a liquid refrigerant flows toward an evaporator.
And a valve body having a second passage through which a gas-phase refrigerant flowing from the evaporator to the compressor passes; an orifice provided in the first passage; and a valve body for adjusting the amount of refrigerant passing through the orifice; A power element provided on the valve body having a diaphragm that senses and displaces the temperature of the gas-phase refrigerant, and a rod-shaped member having a temperature sensing rod function for driving the valve body by displacement of the diaphragm. In the expanded valve, the rod-shaped member is a first member.
A temperature type expansion valve, which is slidably disposed in a hole existing between the first and second passages and a seal member is provided in advance on an inner surface of the hole.