JP2006078140A - Thermal expansion valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal expansion valve capable of accurately sensing refrigerant temperature of an evaporator outlet. <P>SOLUTION: In the thermal expansion valve 1, a heat transfer passage between a port 3 into which a high-temperature refrigerant is introduced and a power element 16 is provided with a waste hole 31 and a screw hole 32, thus the waste hole 31 and the screw hole 32 suppress the temperature of the high temperature refrigerant flowing through the port 3 from transferring to the power element. As a result, the power element 16 can accurately sense the temperature of the refrigerant flowing through a second passage 8 closer than a first passage 7, namely the refrigerant temperature of the evaporator outlet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a temperature-type expansion valve that controls the opening degree of a valve unit based on the temperature of an evaporator outlet, squeezes and expands refrigerant flowing in from a condenser side, and supplies the expanded refrigerant to an evaporator.

  Generally, a refrigeration cycle of an air conditioner for an automobile includes a compressor that compresses a circulating refrigerant, a condenser that condenses the compressed refrigerant, a receiver that stores the refrigerant in the refrigeration cycle and separates the condensed refrigerant into gas and liquid. An expansion valve that squeezes and expands the separated liquid refrigerant, and an evaporator that evaporates the refrigerant expanded by the expansion valve.

  Among these, for example, a temperature type expansion valve that senses the temperature and pressure of the refrigerant at the evaporator outlet and controls the flow rate of the refrigerant sent to the evaporator is used as the expansion valve. The temperature type expansion valve includes a body in which a first passage for allowing refrigerant to pass from the receiver to the evaporator and a second passage for allowing refrigerant returned from the evaporator to pass to the compressor are formed. A valve portion for adjusting the flow rate of the refrigerant is provided in the middle of the first passage of the body, and the temperature and pressure of the refrigerant flowing through the second passage are provided at the end on the second passage side. A power element that senses and controls the opening of the valve portion via a drive shaft is provided (see, for example, Patent Document 1).

  By the way, in order to appropriately control the refrigerant flow rate in such a temperature type expansion valve, it is necessary to accurately sense the refrigerant temperature at the evaporator outlet by the power element. That is, for example, if the temperature expansion valve is placed in an environment that is greatly affected by the temperature of the external atmosphere, such as a high-temperature part of the engine room, the power element senses the temperature of the external atmosphere, and the refrigerant temperature at the evaporator outlet Cannot be detected accurately. As a result, it becomes easy to cause hunting in which the valve portion repeats opening and closing regardless of control.

Therefore, in the temperature type expansion valve described in Patent Document 1, the partition between the power element and the second passage in the body is eliminated so that the power element can easily sense the temperature of the evaporator outlet, and the second passage and the power are removed. The distance from the element is minimized so that the temperature of the refrigerant flowing through the second passage is easily transmitted to the power element. At the same time, the height of the temperature type expansion valve is shortened, which meets the demand for downsizing of the temperature type expansion valve. In this temperature type expansion valve, the dimension between the shafts of the first passage and the second passage is further shortened as much as possible, and the entire temperature type expansion valve is miniaturized.
JP 2000-304382 A

However, if such a miniaturization is advanced in the temperature type expansion valve, there arises a problem that a temperature-sensitive error of the power element is generated due to another factor.
That is, in the temperature type expansion valve, the high-temperature and high-pressure liquid refrigerant that has flowed into the first passage from the receiver is supplied to the evaporator at a low temperature and a low pressure by being squeezed and expanded at the valve portion. The liquid refrigerant partially vaporized at this time evaporates by the evaporator, cools the passenger compartment, and returns to the second passage. For this reason, the refrigerant temperature on the inlet side of the first passage is considerably higher than the refrigerant temperature of the second passage. On the other hand, an aluminum material that is generally lightweight and excellent in workability is used for the body of the temperature type expansion valve. Since this aluminum material has high thermal conductivity, the high-temperature refrigerant temperature is immediately transmitted to the power element through the body. For this reason, when the distance between the first passage and the second passage, that is, the first passage and the power element, is shortened in order to reduce the size of the temperature type expansion valve, the power element is moved to the inlet side of the first passage. Thus, the refrigerant temperature in the second passage that should be sensed cannot be accurately sensed. As a result, a temperature-sensitive error of the power element occurs and hunting is likely to occur.

  The present invention has been made in view of these points, and an object of the present invention is to provide a temperature type expansion valve that can accurately sense the refrigerant temperature at the evaporator outlet.

  In the present invention, in order to solve the above-described problem, the refrigerant is provided in the refrigeration cycle and operates, and the refrigerant flowing in from the condenser side is squeezed and expanded by passing through the internal valve portion to be supplied to the evaporator, and returns from the evaporator. And a first port for introducing refrigerant from the condenser side in a temperature type expansion valve that senses the pressure and temperature of the refrigerant and controls the opening of the valve unit and leads the refrigerant to the compressor side; A first passage that communicates with the first port and passes through the valve portion, and a second port for leading the refrigerant that has passed through the valve portion to the evaporator, and returned from the evaporator. A third port for introducing a refrigerant, a second passage communicating with the third port to constitute a second passage, and a fourth port for leading the refrigerant to the compressor side A body having a shaft, and provided in the body on a side opposite to the first passage with respect to the second passage, sensing a temperature and a pressure of a refrigerant flowing through the second passage, and a shaft A power element that controls an opening degree of the valve portion disposed in the first passage through the first passage and controls a flow rate of the refrigerant flowing from the first port to the second port. A thermal expansion characterized in that a gap is formed at least partially between the first passage and the second passage for blocking heat conduction from the first port to the power element. A valve is provided.

  In such a temperature type expansion valve, since heat conduction is cut off in the void portion of the body, the temperature of the high-temperature refrigerant flowing through the first port is suppressed from being transmitted to the power element. The power element accurately senses the temperature of the refrigerant flowing in the second passage closer to the first passage.

  According to the temperature type expansion valve of the present invention, since the temperature of the high-temperature refrigerant flowing through the first port is suppressed from being transmitted to the power element by the gap formed in the body, the refrigerant temperature in the second passage, that is, the evaporator The refrigerant temperature at the outlet can be accurately detected.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
First, a first embodiment of the present invention will be described. In this embodiment, the temperature type expansion valve of the present invention is embodied as a temperature type expansion valve applied to a refrigeration cycle of an automotive air conditioner. FIG. 1 is a central view showing the structure of the temperature type expansion valve. It is a longitudinal cross-sectional view. FIG. 2 is an explanatory view showing the structure of the temperature type expansion valve. FIG. 2A is a side view of the temperature type expansion valve. FIG. It is.

  As shown in FIG. 1, a thermal expansion valve 1 has a port 3 (first first) for receiving a high-temperature and high-pressure liquid refrigerant from a receiver (capacitor side) on a side portion of a substantially prismatic body 2 formed of an aluminum material. Port), a port 4 (second port) for supplying low-temperature and low-pressure refrigerant throttled and expanded by the temperature type expansion valve 1 to the evaporator, and a port 5 (third port) for receiving the refrigerant evaporated from the evaporator And a port 6 (fourth port) for returning the refrigerant that has passed through the temperature type expansion valve 1 to the compressor. The first passage 7 is constituted by the port 3 and the port 4 and the refrigerant passage connecting them, and the second passage 8 is constituted by the port 5, the port 6 and the refrigerant passage connecting them.

  A valve seat 9 is formed integrally with the body 2 in a portion of the first passage 7 communicating from the port 3 to the port 4, and a valve hole 9 a is defined by the inner peripheral edge of the valve seat 9. On the upstream side of the valve seat 9, a ball-shaped valve body 10 constituting the valve portion is disposed. In addition, a communication hole 11 is formed at the lower end of the body 2 so as to be substantially orthogonal to the first passage 7 and communicate with the outside. An adjustment screw 12 is screwed to seal the communication hole 11. Has been. A circular groove-shaped spring receiving portion 13 is formed on the front end surface of the adjusting screw 12. The spring receiving portion 13 is interposed between the valve body 10 and seats the valve body 10 on the valve seat 9. One end of the compression coil spring 14 biased in the direction is accommodated and supported. The load of the compression coil spring 14 can be adjusted by adjusting the screwing amount of the adjustment screw 12 into the body 2. That is, the adjustment screw 12 functions as an adjustment mechanism that can adjust the elastic force of the compression coil spring 14 by adjusting the position in the communication hole 11. Further, an O-ring 15 is interposed between the adjustment screw 12 and the body 2 to prevent the internal refrigerant from leaking outside through the communication hole 11.

  Further, a power element 16 that functions as a temperature sensing portion is provided in contact with the upper end portion of the body 2. The power element 16 includes an upper housing 17 and a lower housing 18 made of stainless steel, a diaphragm 19 made of a flexible metal thin plate arranged so as to partition a space surrounded by these, and a lower surface of the diaphragm 19. And the disk 20 arranged on the disk. In the temperature sensitive room sealed by the upper housing 17 and the diaphragm 19, the same refrigerant as that used in the refrigeration cycle is enclosed. A communication hole 21 is formed at the upper end of the body 2 so as to be substantially orthogonal to the second passage 8 communicating from the port 5 to the port 6 and communicating with the outside. The element 16 is screwed. An O-ring 22 is interposed between the power element 16 and the body 2 to prevent the internal refrigerant from leaking outside through the communication hole 21. The pressure and temperature of the refrigerant passing through the second passage 8 are transmitted to the lower surface of the diaphragm 19 through the communication hole 21 and the hole or slit provided in the disk 20.

  A shaft 23 that transmits the displacement of the diaphragm 19 to the valve body 10 is disposed below the disk 20. The shaft 23 is inserted through a through hole 24 formed in the body 2. The through-hole 24 has a large-diameter portion 24a at the upper portion and a small-diameter portion 24b at the lower portion, and the upper opening end of the large-diameter portion 24a is formed in a tapered chamfered shape. An O-ring 25 that completely seals between the shaft 23 and the through-hole 24 is disposed in the large-diameter portion 24 a of the through-hole 24, and is configured to completely prevent the refrigerant bypass leak in the through-hole 24. Yes.

  The upper part of the shaft 23 is held by a holder 26 disposed across the second passage 8. The lower end portion of the holder 26 is fitted into the large diameter portion 24 a of the through hole 24, and the lower end surface thereof restricts the movement of the O-ring 25 toward the upper opening end of the through hole 24. The lower end portion of the shaft 23 passes through the small diameter portion 24b and reaches the valve hole 9a. The upper end portion of the shaft 23 is in contact with the lower surface of the disk 20, but the contact surface of the disk 20 is inclined with respect to a plane perpendicular to the axis of the shaft 23. As a result, the movement of the diaphragm 19 in the axial direction applies a load in the axial direction to the shaft 23 as well as a lateral load. As a result, when the movement of the diaphragm 19 is transmitted to the shaft 23, a lateral load component acts on the shaft 23, and the operation of the shaft 23 does not react sensitively even if there is a pressure fluctuation in the high-pressure refrigerant flowing in the fluid passage of the port 3. In this way, vibration in the longitudinal direction of the shaft 23 is suppressed.

  Further, in the temperature type expansion valve 1, the dimension from the center line of the shaft 23 of the body 2 to the side surface on which the port 3 and the port 6 are provided is slightly lengthened, so that the hole on the port 6 side (the end of the pipe not shown) The portion to be inserted is arranged so as to approach the upper surface of the body 2 while being shifted outward so as not to interfere with the mounting hole of the power element 16. Further, the hole on the port 5 side is also configured to be as close to the upper surface of the body 2 as possible. Thereby, size reduction in the height direction of the temperature type expansion valve 1 is realized.

  As shown in FIG. 2, a heat shielding waste hole 31 and a screw hole 32 are provided so as to open on the side surface of the body 2 on the side where the ports 3 and 6 are opened (that is, the engine room side). The discard hole 31 is formed by drilling with a drill, and the screw hole 32 is formed with a thread portion 32a having a predetermined depth using a tap after drilling with the drill. In addition, in the same figure (B), illustration of the shaft 23 and the holder 26 which were penetrated by the through-hole 24 is abbreviate | omitted (the same also applies to the following corresponding figures).

  The discard hole 31 and the screw hole 32 are formed so as to extend substantially parallel to the second passage 8 between the port 3 and the port 6, and are respectively disposed from both ends in the width direction of the body 2. . That is, the discard hole 31 and the screw hole 32 are provided on a straight line connecting the thin portion 2 a in the vicinity of the second passage 8 in the body 2 and the center portion of the port 3.

  As a result, the temperature of the high-temperature refrigerant in the port 3 partially blocks the heat transfer path that reaches the power element 16 via the thin-walled portion 2a, so that the power element 16 is affected by the temperature of the high-temperature refrigerant. Suppressed. Note that a fixing plate (not shown) for connecting each pipe connected to the compressor and the receiver is attached to the temperature type expansion valve 1, and a bolt for fixing this fixing plate is screwed into the screw hole 32. . For this reason, when the bolt is fastened, the screw hole 32 is partially blocked. However, the bolt is generally made of a steel material, and its thermal conductivity is considerably smaller than that of the aluminum material forming the body 2, so that the temperature transmission suppressing effect is exhibited at that portion. Moreover, since the space | gap 32b is formed in the front end side of a volt | bolt, the heat insulation effect is exhibited in the part.

  Returning to FIG. 1, in the temperature type expansion valve 1 configured as described above, the power element 16 senses the pressure and temperature of the refrigerant returning from the evaporator and passing through the second passage 8, and the temperature of the refrigerant is When the pressure is high or the pressure is low, the valve body 10 is pushed in the valve opening direction via the shaft 23 to increase the lift amount from the valve seat 9, and conversely when the temperature is low or the pressure is high, the valve body The valve opening is controlled by moving the valve 10 in the valve closing direction to reduce the lift amount from the valve seat 9. On the other hand, the liquid refrigerant supplied from the receiver flows into the space where the valve body 10 is located through the port 3, and is squeezed and expanded by passing through the valve portion in which the valve opening degree is controlled, and becomes a low-temperature / low-pressure refrigerant. Become. The refrigerant exits from the port 4 and is supplied to the evaporator, where it exchanges heat with the air in the passenger compartment and returns to the port 5 of the temperature expansion valve 1. At this time, the temperature type expansion valve 1 controls the flow rate of the refrigerant supplied to the evaporator so that the refrigerant at the outlet of the evaporator has a predetermined degree of superheat, so that the refrigerant is completely evaporated from the evaporator to the compressor. Returned.

  As described above, according to the temperature type expansion valve 1, the waste hole 31 and the screw hole 32 are disposed in the heat transfer path between the port 3 into which the high-temperature refrigerant is introduced and the power element 16. The temperature of the high-temperature refrigerant flowing through the port 3 is suppressed from being transmitted to the power element through the body 2. As a result, the power element 16 can accurately sense the temperature of the refrigerant flowing in the second passage 8 that is closer to the first passage 7, that is, the refrigerant temperature at the evaporator outlet. It is possible to appropriately and stably control the flow rate of the refrigerant flowing through the.

  In particular, in the temperature type expansion valve 1 of the present embodiment, the distance between the port 3 and the power element 16 is shortened in order to reduce the body 2 in the height direction. Further, as the distance from the center line of the shaft 23 to the side surface on which the ports 3 and 6 are provided becomes longer, the cross section (heat conduction surface) between the first passage 7 and the second passage 8 becomes larger. ing. For this reason, when the influence of the heat conduction from the port 3 is increased, the heat conduction can be greatly reduced by the heat shielding structure composed of the discard hole 31 and the screw hole 32 (gap). In this respect, the effect of the present invention can be exhibited particularly remarkably. Conversely, by adopting this heat shield structure, further miniaturization of the temperature type expansion valve can be expected.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The temperature type expansion valve according to the present embodiment is the same as the configuration of the first embodiment except that the heat shield structure in the body is different, and thus the same components are denoted by the same reference numerals. Therefore, the description is omitted. FIG. 3 is an explanatory view showing the structure of the thermal expansion valve according to the present embodiment, (A) is a side view of the thermal expansion valve, and (B) is a BB arrow of (A). FIG.

  As shown in FIG. 3A, in the temperature type expansion valve 201, a pair of parallel heat-dissipating holes 231 passing through the body 202 between the first passage 7 and the second passage 8 are provided. 232 is provided. These discard holes are formed by drilling with a drill at a height position slightly away from the second passage 8 than the gap portion of the first embodiment.

  Thereby, the temperature of the high-temperature refrigerant in the port 3 partially blocks the heat transfer path that reaches the power element 16 via the thin-walled portion 2a and suppresses the power element 16 from being affected by the temperature of the high-temperature refrigerant. is doing.

  Also in this embodiment, the same effect as in the first embodiment can be obtained by the heat shielding effect by the discard hole, but since all the gaps are configured by the discard hole, the heat conduction is completely performed in that portion. The heat shielding effect is increased at the point where it is interrupted. The above-mentioned discard hole can also be used as an insertion hole through which a fixing screw for fixing the pipe connection fixing plate and the temperature type expansion valve 201 (not shown) is inserted. Demonstrate the heat effect greatly.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. The temperature type expansion valve according to the present embodiment is the same as the configuration of the first embodiment except that the heat shield structure in the body is different, and thus the same components are denoted by the same reference numerals. Therefore, the description is omitted. FIG. 4 is a central longitudinal sectional view showing the structure of the temperature type expansion valve. FIG. 5 is an explanatory view showing the structure of the temperature type expansion valve according to the present embodiment, (A) is a side view of the temperature type expansion valve, and (B) is a C- It is C arrow sectional drawing.

  As shown in FIGS. 4 and 5, in the thermal expansion valve 301, three heat shielding throwing holes 331, 332 and 333 are arranged in parallel between the first passage 7 and the second passage 8. ing. These throwing holes are arranged in parallel to each other, and the throwing holes 331 and 333 are provided through the body 302 in the vicinity of both ends in the width direction of the body 302, and the central throwing hole 332 is an insertion portion of the shaft 23. It extends to the front of the through hole 24.

Also in the present embodiment, the same effect as in the first and second embodiments can be obtained by the heat shielding effect by the discard hole, but since the number of the discard holes is large, the heat shield effect is exhibited more greatly.
[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. The temperature type expansion valve according to the present embodiment is the same as the configuration of the first embodiment except that the heat shield structure in the body is different, and thus the same components are denoted by the same reference numerals. Therefore, the description is omitted. FIG. 6 is a central longitudinal sectional view showing the structure of this temperature type expansion valve. FIG. 7 is an explanatory view showing the structure of the thermal expansion valve according to the present embodiment, (A) is a side view of the thermal expansion valve, and (B) is a D- It is D arrow sectional drawing.

  As shown in FIGS. 6 and 7, in the temperature type expansion valve 401, a pair of heat shielding slits 431 and 432 and a screw hole 433 are arranged between the first passage 7 and the second passage 8. It is installed. The slits 431 and 432 are groove portions having a predetermined depth (about 1/3 of the width of the body 402 in the present embodiment) opened at both end surfaces in the width direction of the body 402, and the ports 3 and 6 are opened. Both the surface and the surface where the ports 4 and 5 open are open. These slits 431 and 432 are formed at the same time when the body 402 is formed by extrusion of an aluminum material. The screw hole 433 has the same shape as the screw hole 32 of the first embodiment, and extends to the front of the through hole 24.

  Also in the present embodiment, the same effect as that of the third embodiment can be obtained by the heat shielding effect by the slits 431 and 432 and the screw hole 433 (gap). In addition, since the slits 431 and 432 are formed at the same time as the extrusion of the body 402, post-processing (cutting) is not necessary, material costs can be reduced, and processing time can be shortened.

  In this embodiment, the slits 431 and 432 are formed by extrusion. However, the slits 431 and 432 may be formed by cutting using a tool such as an end mill. Further, the screw hole 433 may be changed to a discard hole (a hole in which no screw portion is formed).

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described. The temperature type expansion valve according to the present embodiment is the same as the configuration of the first embodiment except that the heat shield structure in the body is different, and thus the same components are denoted by the same reference numerals. Therefore, the description is omitted. FIG. 8 is a central longitudinal sectional view showing the structure of this temperature type expansion valve. Moreover, FIG. 9 is explanatory drawing showing the structure of the temperature type expansion valve which concerns on this Embodiment, (A) is one side view of the temperature type expansion valve, (B) is E- of (A). It is E arrow sectional drawing.

  As shown in FIGS. 8 and 9, the thermal expansion valve 501 is provided with a heat shielding slit 531 that bisects the body 502 in the vicinity of the port 6 between the port 3 and the port 6. A screw hole 532 is provided slightly below the center in the width direction. The ends of the slit 531 and the screw hole 532 reach the front of the through hole 24. Since the slit 531 has a small width (about 1/4 of the screw hole 532 in this embodiment), the slit 531 is formed by cutting using a cutter.

  In the present embodiment, since the direct heat transfer path between the port 3 and the power element 16 is completely blocked by the slit 531, a large heat shielding effect can be expected. In this case, the temperature of the high-temperature refrigerant in the port 3 may be transmitted to the power element 16 through the port 4 and the port 5 side, bypassing the slit 531. However, since the portion on the port 4 side of the body 502 is cooled by the low-temperature refrigerant, it is cooled when passing through it, and it is considered that there is almost no influence on the power element 16.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described. The thermal expansion valve according to the present embodiment is the same as the configuration of the fifth embodiment except that the structure of the slit formed in the body is slightly different. A description thereof will be omitted, for example. FIG. 10 is an explanatory view showing the structure of the temperature type expansion valve according to the present embodiment, (A) is a side view of the temperature type expansion valve, and (B) is an FF arrow of (A). FIG.

  As shown in FIG. 10, the slit 631 of the temperature type expansion valve 601 has a configuration in which both end portions in the width direction of the slit 531 of the fifth embodiment are further extended to the port 4 side. Thereby, it is possible to more reliably prevent the temperature of the high-temperature refrigerant in the port 3 from being transmitted to the power element 16 through the port 4 and the port 5 side of the body 602.

[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described. Note that the temperature type expansion valve according to the present embodiment is the same as the configuration of the fifth embodiment except that the heat shield structure in the body is slightly different. Therefore, the same components are denoted by the same reference numerals. The description thereof will be omitted. FIG. 11 is an explanatory view showing the structure of the temperature type expansion valve according to the present embodiment, (A) is a side view of the temperature type expansion valve, and (B) is a GG arrow of (A). FIG.

  As shown in FIG. 11, the body 702 of the temperature type expansion valve 701 is provided with a pair of parallel discard holes 732 and 733 which are drilled from the side surface on the side where the ports 4 and 5 are opened. These throwing holes 732 and 733 are disposed at substantially the same height as the slit 531 from both ends of the body 702 in the width direction. Thereby, it is possible to more reliably prevent the temperature of the high-temperature refrigerant in the port 3 from being transmitted to the power element 16 through the port 4 and the port 5 side of the body 702.

[Eighth Embodiment]
Next, an eighth embodiment of the present invention will be described. The thermal expansion valve according to the present embodiment is the same as the configuration of the fifth embodiment except that the structure of the slit formed in the body is slightly different. A description thereof will be omitted, for example. FIG. 12 is a central longitudinal sectional view showing the structure of the temperature type expansion valve. Moreover, FIG. 13 is explanatory drawing showing the structure of the temperature type expansion valve which concerns on this Embodiment, (A) is one side view of the temperature type expansion valve, (B) is H- of (A). It is H arrow sectional drawing.

  As shown in FIGS. 12 and 13, the slit 831 of the temperature type expansion valve 801 is further provided so as to further expand the area of the slit 531 of the fifth embodiment and surround the vicinity of the through hole 24 in the body 802. ing. Thereby, the heat transfer path from the port 3 is almost certainly cut off, and the temperature of the high-temperature refrigerant can be almost certainly prevented from being transmitted to the power element 16.

[Ninth Embodiment]
Next, a ninth embodiment of the present invention will be described. The thermal expansion valve according to the present embodiment is the same as the configuration of the fifth embodiment except that the structure of the slit formed in the body is slightly different. A description thereof will be omitted, for example. FIG. 14 is an explanatory view showing the structure of the thermal expansion valve according to the present embodiment, (A) is a side view of the thermal expansion valve, and (B) is an II arrow of (A). FIG.

  As shown in FIG. 14, the temperature type expansion valve 901 includes a slit 932 that opens on the opposite side of the body 902 from the slit 531. Thereby, the heat transfer area from the port 3 is reduced, and the temperature of the high-temperature refrigerant can be more reliably prevented from being transmitted to the power element 16.

[Tenth embodiment]
Next, a tenth embodiment of the present invention will be described. The temperature type expansion valve according to the present embodiment is the same as the configuration of the first and second embodiments except that the heat shielding structure in the body is different. A description thereof will be omitted, for example. FIG. 15 is a central longitudinal sectional view showing the structure of the temperature type expansion valve. FIG. 16 is an explanatory view showing the structure of the temperature type expansion valve according to the present embodiment, (A) is a side view of the temperature type expansion valve, and (B) is a J- It is J arrow sectional drawing.

  As shown in FIGS. 15 and 16, in the body 1002 of the temperature type expansion valve 1001, a ring-shaped counterbore 1033 is formed around the port 3 on the side surface where the port 3 and the port 6 are opened. In addition, a heat shield structure is formed together with the discard holes 231 and 232 provided between the spot facing portion 1033 and the second passage 8. The spot facing portion 1033 has a depth similar to a hole on the port 3 side (a portion into which a tip of a pipe (not shown) is inserted). Thereby, the main heat transfer path from the port 3 is blocked, and the temperature of the high-temperature refrigerant can be prevented from being transmitted to the power element 16.

[Eleventh embodiment]
Next, an eleventh embodiment of the present invention will be described. The temperature type expansion valve according to the present embodiment is the same as the configuration of the first embodiment except that the heat shield structure in the body is different, and thus the same components are denoted by the same reference numerals. Therefore, the description is omitted. FIG. 17 is a central longitudinal sectional view showing the structure of this temperature type expansion valve. FIG. 18 is an explanatory view showing the structure of the thermal expansion valve according to the present embodiment, (A) is a side view of the thermal expansion valve, and (B) is a K- of (A). It is K arrow sectional drawing.

  As shown in FIGS. 17 and 18, the body 1102 of the temperature type expansion valve 1101 has a pair of disposal holes 1131 and 1132 so as to penetrate the side surface orthogonal to the side surface on which the port 3 and the port 6 are opened. Is provided. Further, a screw hole 1133 for fastening a fixing screw is provided at a position near the port 6 on the side surface on the side where the port 3 and the port 6 are opened. Thereby, the main heat transfer path from the port 3 is partially blocked, and the temperature of the high-temperature refrigerant can be prevented from being transmitted to the power element 16.

[Twelfth embodiment]
Next, a twelfth embodiment of the present invention will be described. The temperature type expansion valve according to the present embodiment is the same as the configuration of the first embodiment except that the heat shield structure in the body is different, and thus the same components are denoted by the same reference numerals. Therefore, the description is omitted. FIG. 19 is a central longitudinal sectional view showing the structure of this temperature type expansion valve. FIG. 20 is an explanatory view showing the structure of the temperature type expansion valve according to the present embodiment, (A) is a side view of the temperature type expansion valve, and (B) is an L- It is L arrow directional cross-sectional view.

  As shown in FIGS. 19 and 20, the body 1202 of the thermal expansion valve 1201 has a wide groove 1231 on the side surface on the side where the port 3 and the port 6 are opened so as to penetrate the side surface orthogonal thereto. Provided below the port 3 is a notch 1232 that is notched to the vicinity of the communication hole 11. Further, on the side surface on the side where the ports 3 and 6 are opened, screw holes 1233 for fastening screws for fixing at positions where they are mutually diagonally above the port 3 and diagonally above the port 6, respectively. 1234 is provided.

  The groove 1231 is formed at a position slightly deeper than the hole on the port 3 side. Thereby, the main heat transfer path from the port 3 is blocked, and the temperature of the high-temperature refrigerant can be prevented from being transmitted to the power element 16. The groove 1231 and the notch 1232 are formed simultaneously when the body 1202 is extruded.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and changes and modifications can be made within the spirit of the present invention. Not too long.

  For example, in each of the embodiments described above, a configuration in which a hole or a groove is provided in the vertical direction in the height direction between the first passage and the second passage of the body is shown. Further, at least one of the groove portions may be provided in a plurality of stages.

  Further, in each of the above embodiments, there is a form in which there may be inclusions such as bolts in the gap part, but from the viewpoint of the heat shielding effect, there is a form having a gap part without inclusions. Good.

It is a center longitudinal cross-sectional view showing the structure of the temperature type expansion valve of 1st Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 1st Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 2nd Embodiment. It is a center longitudinal cross-sectional view showing the structure of the temperature type expansion valve of 3rd Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 3rd Embodiment. It is a center longitudinal cross-sectional view showing the structure of the temperature type expansion valve of 4th Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 4th Embodiment. It is a center longitudinal cross-sectional view showing the structure of the temperature type expansion valve of 5th Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 5th Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 6th Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 7th Embodiment. It is a center longitudinal cross-sectional view showing the structure of the temperature type expansion valve of 8th Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 8th Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 9th Embodiment. It is a center longitudinal cross-sectional view showing the structure of the temperature type expansion valve of 10th Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 10th Embodiment. It is a center longitudinal cross-sectional view showing the structure of the temperature type expansion valve of 11th Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 11th Embodiment. It is a center longitudinal cross-sectional view showing the structure of the temperature type expansion valve of 12th Embodiment. It is explanatory drawing showing the structure of the temperature type expansion valve of 12th Embodiment.

Explanation of symbols

1,201,301,401,501,601,701,801,901,1001,1101,1201 Thermal expansion valve 2,202,302,402,502,602,702,802,902,1002,1102,1202 Body 2a Thin portion 3, 4, 5, 6 Port 7 First passage 8 Second passage 9 Valve seat 9a Valve hole 10 Valve body 16 Power element 19 Diaphragm 20 Disc 21 Communication hole 23 Shaft 24 Through hole 26 Holder 31 231, 232, 331, 332, 333, 732, 733, 1131, 1132 Throw hole 32, 433, 532, 1133, 1233, 1234 Screw hole 431, 432, 531, 631, 831, 932 Slit 1033 Spot facing

Claims (11)

Provided and operated in the refrigeration cycle, the refrigerant flowing in from the condenser side is expanded by being passed through the internal valve portion and supplied to the evaporator, and the pressure and temperature of the refrigerant returned from the evaporator are sensed to detect the refrigerant In the temperature type expansion valve that controls the opening of the valve part and leads the refrigerant to the compressor side,
A first port for introducing refrigerant from the condenser side and a first passage communicating with the first port and passing through the valve portion are configured, and the refrigerant that has passed through the valve portion is passed to the evaporator. A second port for deriving, a third port for introducing the refrigerant returned from the evaporator, and a second passage communicating with the third port, and deriving the refrigerant to the compressor side A body having a fourth port for
In the body, the first passage is provided on a side opposite to the first passage with respect to the second passage, senses the temperature and pressure of the refrigerant flowing through the second passage, and passes through the shaft. A power element that controls an opening degree of the valve portion disposed in the first port and controls a flow rate of the refrigerant flowing from the first port to the second port;
With
A gap portion for blocking heat conduction from the first port to the power element is formed at least partially between the first passage and the second passage in the body. A temperature expansion valve.   The gap portion includes one or a plurality of holes formed so as to extend substantially parallel to the second passage between the first port and the fourth port of the body. The temperature type expansion valve according to claim 1.   The temperature type expansion valve according to claim 2, wherein the hole is provided through the body. The body is made of aluminum material,
The temperature type expansion valve according to claim 2, wherein at least one of the hole portions also serves as an insertion hole through which a fixing screw is inserted.   The gap portion is composed of one or a plurality of holes or grooves formed so as to extend between the first port and the fourth port of the body, and has a thin wall near the second passage in the body. The temperature type expansion valve according to claim 1, wherein the temperature type expansion valve is provided at a position where a heat transfer path connecting a portion and the first port is partially blocked.   The said gap | interval part consists of a hole provided in the vicinity of the said 2nd channel | path, and was provided on the straight line which connects the center part of the said 1st channel | path, and the said thin part. The temperature type expansion valve as described.   The gap portion is formed of a pair of groove portions extending substantially parallel to the second passage on both sides in the width direction of the body, and the groove portions are integrally formed when the body is extruded. 1. The temperature type expansion valve according to 1.   2. The temperature type expansion valve according to claim 1, wherein the gap portion comprises a slit having a predetermined depth that bisects the body at least between the first port and the fourth port.   The slit is provided so as to surround the vicinity of the insertion portion of the shaft at a predetermined cross-sectional position between the first passage and the second passage in the body. The temperature type expansion valve according to claim 8. The slit is provided so as to cross between the first port and the fourth port in the body;
9. The temperature type expansion valve according to claim 8, wherein one or a plurality of holes opening on the opposite side of the slit are provided between the second port and the third port of the body. . 2. The temperature type expansion valve according to claim 1, wherein the gap portion includes a groove portion provided to surround the first port on a side surface of the body where the first port opens.

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