JP2014152850A - Electromagnetic valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a control valve having a throttle expansion function and a cutoff function in a compact manner and provide the control valve at a low price.SOLUTION: An electromagnetic valve 12 according to one embodiment includes: a body 20 having an internal passage for passing a refrigerant; a main valve hole 36 provided at a middle portion of the internal passage; a solenoid 16 which is attached to the body 20 and forms a valve chamber 26 between itself and the main valve body 36; a main valve element 40 which is disposed at the valve chamber 26 and comes in contact with or separates from the main valve hole 36 according to a driving force of the solenoid 16 thereby opening and closing the internal passage; and an orifice member 82 which is integrally provided with the body 20 so as to form a part of the internal passage and is used for expanding the refrigerant by throttling.

Description

  The present invention relates to a solenoid valve that controls the flow of fluid.

  The refrigeration cycle of an automotive air conditioner generally includes a compressor that compresses the circulating refrigerant, a condenser that condenses the compressed refrigerant, a receiver that separates the condensed refrigerant into gas and liquid, and the separated liquid refrigerant is squeezed and expanded. There are provided an expansion device that delivers the fuel in a mist form, and an evaporator that evaporates the mist-like refrigerant and uses the latent heat of evaporation to cool the air in the passenger compartment. As the expansion device, for example, the temperature and pressure of the refrigerant at the outlet of the evaporator is sensed to control the flow rate of the refrigerant sent to the evaporator so that the refrigerant derived from the evaporator has an appropriate degree of superheat. A temperature expansion valve is used.

  By the way, in a vehicle using a battery as main power, such as an electric vehicle, temperature management is required to maintain the normal state of the battery. Therefore, it is considered to incorporate a battery cooling device by branching the refrigeration cycle. That is, the first evaporator for air conditioning and the second evaporator for cooling the battery are connected in parallel to enable heat exchange. In that case, an expansion device is provided on the upstream side of each evaporator. However, depending on the driving situation of the vehicle and the external environment, a situation where one of the evaporators should be preferentially functioned is also assumed. On the other hand, there is a case where one evaporator does not need to function, and in that case, it is preferable to avoid unnecessary energy consumption. In this regard, for example, it is conceivable to apply the configuration of the dual air conditioner described in Patent Document 1. The cited document discloses a configuration in which a solenoid valve is provided for each of the two-stage temperature expansion valves and the solenoid valve is opened only when cooling is necessary.

JP 7-151259 A

  However, the configuration in which the expansion valve and the electromagnetic valve are provided is large, even when they are connected by piping, as well as being unitized as described in the cited document, and space problems are likely to occur. In addition, the weight increases and the cost also increases.

  An object of the present invention is to provide a control valve having a throttle expansion function and a shut-off function in a compact manner and to provide a low cost.

  In order to solve the above problems, an electromagnetic valve according to an aspect of the present invention includes a body having an internal passage for allowing refrigerant to pass through, a valve hole provided in the middle of the internal passage, a valve hole attached to the body, A solenoid that forms a valve chamber between the valve body, a valve body that is disposed in the valve chamber and that opens and closes the internal passage according to the driving force of the solenoid, and forms a part of the internal passage And an orifice that is provided integrally with the body and squeezes and expands the refrigerant.

  According to this aspect, since the orifice is integrally provided in the body of the solenoid valve, the configuration can be realized more compactly and at a lower cost than the construction in which the solenoid valve and the expansion valve are assembled together. Since it is an orifice, it is difficult to realize highly accurate throttle expansion like a temperature expansion valve, but it is sufficient if it is an application that only needs to cool an object, such as a battery cooling device. The function can be demonstrated.

  According to the present invention, a control valve having a throttle expansion function and a cutoff function can be configured in a compact manner and can be provided at low cost.

It is a figure which shows typically schematic structure of the refrigerating cycle of a vehicle. It is sectional drawing showing the specific structure of the solenoid valve which concerns on 1st Embodiment. It is the A section enlarged view of FIG. It is a figure showing the state which assembled | attached the solenoid valve to the attachment housing of an evaporator. It is a figure showing the state which assembled | attached the solenoid valve to the attachment housing of an evaporator. It is a figure showing the structure of the connection member. It is sectional drawing showing the structure of the solenoid valve which concerns on 2nd Embodiment. It is sectional drawing showing the structure of the solenoid valve which concerns on 3rd Embodiment. It is sectional drawing showing the structure of the solenoid valve which concerns on 4th Embodiment. It is sectional drawing showing the structure of the solenoid valve which concerns on 5th Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for the sake of convenience, the positional relationship between the structures may be expressed based on the illustrated state.
[First Embodiment]
In this embodiment, the electromagnetic valve of the present invention is embodied as an expansion device that cools a vehicle-mounted battery of a hybrid vehicle or an electric vehicle. FIG. 1 is a diagram schematically illustrating a schematic configuration of a refrigeration cycle of a vehicle.

  The refrigeration cycle 1 is configured by connecting in parallel a first refrigerant circulation circuit for air-conditioning a vehicle interior and a second refrigerant circulation circuit for cooling an in-vehicle battery. Specifically, the compressor 2, the condenser 4, and the receiver 6 are provided in the common refrigerant circulation passage, the first expansion device 7 and the first evaporator 8 are provided in one of the branched individual refrigerant circulation passages, and the other. A second expansion device 9 and a second evaporator 10 are provided. The first evaporator 8 is an evaporator for air conditioning, and the second evaporator 10 is an evaporator for battery cooling.

  The high-temperature and high-pressure refrigerant compressed by the compressor 2 is sent to the condenser 4 for heat exchange with the air outside the passenger compartment and condensed. The condensed refrigerant is gas-liquid separated by the receiver 6, and the liquid refrigerant is sent to at least one of the first expansion device 7 and the second expansion device 9. The first expansion device 7 squeezes and expands the introduced liquid refrigerant to form a low-temperature and low-pressure gas-liquid two-phase refrigerant, and sends it to the first evaporator 8. The first evaporator 8 evaporates the refrigerant sent from the first expansion device 7 by exchanging heat with the air in the passenger compartment, and returns the evaporated gas refrigerant to the compressor 2. At this time, the first expansion device 7 detects the refrigerant temperature at the outlet of the first evaporator 8 and controls the flow rate of the refrigerant sent to the first evaporator 8 so that the refrigerant at the outlet has a predetermined degree of superheat. The first expansion device 7 is assembled with an unillustrated expansion valve (temperature-type expansion valve) and a shut-off valve (electromagnetic valve) that allows or blocks the flow of refrigerant on the downstream side of the valve portion of the expansion valve. Configured as a composite valve. Regarding the specific configuration, for example, the configuration of Japanese Patent Application No. 2012-120152 (unpublished) can be adopted, and the description thereof is omitted.

  Similarly, the second expansion device 9 squeezes and expands the introduced liquid refrigerant to form a low-temperature, low-pressure gas-liquid two-phase refrigerant and sends it to the second evaporator 10. The second evaporator 10 evaporates the refrigerant sent from the second expansion device 9 by exchanging heat with the battery, and returns the evaporated gas refrigerant to the compressor 2. The second expansion device 9 does not include a temperature type expansion valve as will be described later, and is a solenoid valve assembled with a fixed orifice. Therefore, the second expansion device 9 autonomously adjusts the flow rate of the refrigerant sent to the second evaporator 10. There is nothing.

  In the present embodiment, when only the air conditioner is functioning, the electromagnetic valve of the first expansion device 7 is opened, and the electromagnetic valve of the second expansion device 9 is closed. Conversely, when only the battery cooling device is to function, the electromagnetic valve of the first expansion device 7 is closed and the electromagnetic valve of the second expansion device 9 is opened.

  Next, a specific configuration of the electromagnetic valve of the present embodiment will be described. The second expansion device 9 of the present embodiment is configured as a so-called pilot-actuated electromagnetic valve. FIG. 2 is a cross-sectional view illustrating a specific configuration of the electromagnetic valve 12 according to the first embodiment. The electromagnetic valve 12 is configured by assembling a valve body 14 and a solenoid 16. The valve body 14 has a stepped cylindrical body 20, and a solenoid 16 is assembled so as to seal the upper end opening of the body 20.

  The solenoid valve 12 is attached to a mounting housing of a second evaporator (not shown). For this reason, the outer diameter of the body 20 is gradually reduced downward so that the body 20 can be easily attached to the accommodation hole provided in the mounting housing. The body 20 is provided with an introduction port 22 for introducing the refrigerant from the upstream side, a lead-out port 24 for leading the refrigerant to the downstream side (that is, the second evaporator side), and an internal passage that connects these ports. .

  A valve chamber 26 is defined between the body 20 and the solenoid 16. The valve chamber 26 is formed in the middle of the internal passage, and connects the upstream introduction passage 28 and the downstream outlet passage 30. The introduction passage 28 communicates the introduction port 22 and the valve chamber 26, and the lead-out passage 30 communicates the valve chamber 26 and the lead-out port 24. In the present embodiment, as illustrated, the lead-out passage 30 extends along the axis of the body 20. The introduction passage 28 extends in parallel with the lead-out passage 30 at a position radially outward from the axis of the body 20. That is, both the introduction port 22 and the outlet port 24 are open toward the lower side of the body 20 (on the side opposite to the solenoid 16). O-rings 32 and 34 for sealing are fitted on the outer peripheral surfaces of the central portion and the lower end portion of the body 20 in the axial direction. The introduction port 22 is located between the O-ring 32 and the O-ring 34.

  The outlet passage 30 communicates with the valve chamber 26 via the main valve hole 36. A main valve seat 38 is formed at the upstream opening end of the main valve hole 36. In the valve chamber 26, a stepped columnar main valve body 40 is disposed. The main valve is opened and closed when the main valve body 40 is attached to and detached from the main valve seat 38. A stepped cylindrical guide portion 42 extends from the solenoid 16 side toward the valve chamber 26, and the main valve body 40 is inserted into the guide portion 42. The guide part 42 is connected to the body 20 via an O-ring 43 for sealing.

  The main valve body 40 and the guide portion 42 are disposed coaxially (on the same axis) as the main valve hole 36. The main valve body 40 defines a back pressure chamber 44 between the main valve body 40 and the guide portion 42. The outer peripheral surface of the main valve body 40 is slidably supported on the inner peripheral surface of the guide portion 42, and operates stably in the axial direction (opening / closing direction of the main valve). A small-diameter pilot valve hole 45 penetrating the center of the main valve body 40 in the axial direction is provided. A spring 46 (functioning as an “urging member”) that biases the main valve body 40 in the valve opening direction is interposed between the lower end portion of the guide portion 42 and the main valve body 40.

  On the other hand, the solenoid 16 includes a sleeve 48, a core 50 fixed so as to seal the upper end opening of the sleeve 48, a plunger 52 disposed opposite to the core 50 in the sleeve 48, and the sleeve 48 and the core 50. It includes a bobbin 56 fitted by extrapolation and an electromagnetic coil 58 wound around the bobbin 56. The plunger 52 is disposed between the core 50 and the main valve body 40. A pair of end members 60 are provided so as to sandwich the electromagnetic coil 58 vertically. The end member 60 also functions as a yoke that constitutes a magnetic circuit. A current-carrying harness 62 is drawn out from the end member 60. The solenoid 16 is connected to the body 20 via a seal ring 66. A connecting member 68 for fixing the body 20 to the mounting housing is provided between the body 20 and the solenoid 16.

  The sleeve 48 has a stepped cylindrical shape, and the lower half of the sleeve 48 is enlarged in diameter and is connected to the guide portion 42. The core 50 has a stepped columnar shape, and the lower end of the core 50 is fitted to the upper end of the sleeve 48 to seal the upper end opening of the sleeve 48. The plunger 52 has a bottomed cylindrical shape, and is provided with a communication passage 70 that communicates inside and outside at the side. The space between the plunger 52 and the core 50 communicates with the back pressure chamber 44 through the communication passage 70 and a communication groove (not shown) formed on the outer peripheral surface of the plunger 52.

  A thin pilot valve body 76 is integrally provided at the lower end central portion of the plunger 52. The pilot valve body 76 has a tapered shape with a lower portion whose diameter decreases downward. The pilot valve body 76 extends to the back pressure chamber 44 and contacts and separates from the pilot valve hole 45 to open and close the pilot valve. A spring receiver 78 made of an elastic body (for example, rubber) is provided at the center of the lower surface of the core 50, and a spring 80 that biases the pilot valve body 76 in the valve closing direction between the spring receiver 78 and the plunger 52. (Acting as a “biasing member”) is interposed. In this embodiment, the spring 80 is set to have a larger spring load than the spring 46.

  An orifice member 82 is provided at the end of the introduction passage 28 on the valve chamber 26 side. The orifice member 82 is provided integrally with the body 20 so as to form a part of the internal passage, and functions as a fixed orifice (an orifice whose cross section of the throttle passage does not change according to the flow of the refrigerant) for constricting and expanding the refrigerant. To do. The orifice member 82 is inserted from the upper end opening of the body 20 before assembling the solenoid 16 to the body 20 and assembled to the opening end of the introduction passage 28.

  FIG. 3 is an enlarged view of a portion A in FIG. (A) shows the open state of the main valve, and (B) shows the closed state of the main valve. As shown in FIG. 3A, the main valve body 40 has a valve member 86 made of a cylindrical elastic body (for example, polytetrafluoroethylene (PTFE) or rubber) fixed to the inside of a cylindrical main body 84. When the valve member 86 is attached to or detached from the main valve seat 38, the main valve is opened and closed. The pilot valve hole 45 penetrates along the axis of the valve member 86. A pilot valve seat 88 is formed at the end of the pilot valve hole 45 on the back pressure chamber 44 side.

  A small-diameter orifice 90 (functioning as a “leak passage”) that communicates the inside and outside of the back pressure chamber 44 is formed near the periphery of the main body 84. Further, a shielding wall 92 that extends outward in the radial direction in a flange shape is provided at the lower end of the main body 84. A concave portion 94 is provided between the sliding portion of the main valve body 40 with the guide portion 42 and the shielding wall 92. The concave portion 94 forms a gap S between the concave portion 94 and the sliding surface of the guide portion 42 when the main valve shown in FIG. The shielding wall 92 and the concave portion 94 prevent or suppress foreign matters in the refrigerant from biting into the sliding portion between the main valve body 40 and the guide portion 42.

  That is, even when foreign matter such as metal powder contained in the refrigerant goes around the shielding wall 92 and adheres to the recess 94 when the main valve shown in FIG. In the process of relative displacement with respect to 42, the gap S is accommodated in the gap S, and it is possible to prevent or suppress a situation in which the foreign matter bites into both sliding portions. In other words, the concave portion 94 is provided in the main valve body 40 on the movable side, and even if the main valve body 40 is drawn inward of the guide portion 42 by the valve opening operation, the attached foreign matter is difficult to contact the sliding surface. It is said. As a result, it is possible to prevent or suppress the malfunction of the valve portion due to the biting of foreign matter.

  A mounting hole 100 is formed in the upper portion of the introduction passage 28 so as to gradually increase in diameter toward the valve chamber 26 side. On the other hand, the orifice member 82 is formed of a stepped cylindrical small piece, and has a flange portion 102 extending radially outward at an upper end portion thereof, and the diameter thereof is gradually reduced downward. The orifice member 82 is inserted into the attachment hole 100 from the lower end side, and the upper portion (lower than the flange portion 102) is press-fitted into the attachment hole 100. When the flange portion 102 is locked to the opening end of the mounting hole 100, the amount of press-fitting is regulated. The orifice member 82 has a throttle passage 104 therein. As shown in FIG. 3A, the liquid refrigerant introduced into the introduction passage 28 is swelled and expanded in the process of passing through the restriction passage 104 and introduced into the valve chamber 26.

  Returning to FIG. 2, in the solenoid valve 12 configured as described above, no attractive force acts between the core 50 and the plunger 52 when the solenoid 16 is off (non-energized state). Therefore, the pilot valve body 76 is biased by the biasing force of the spring 80, and the pilot valve body 76 is seated on the pilot valve seat 88 and the pilot valve is closed as shown in FIG. At this time, since the refrigerant in the introduction passage 28 is introduced into the back pressure chamber 44 through the orifice 90, a differential pressure in the valve closing direction acts on the main valve body 40. As a result, the main valve maintains a closed state.

  On the other hand, when the solenoid 16 is turned on (energized state), a suction force acts between the core 50 and the plunger 52, so that the pilot valve body 76 is in a pilot valve seat 88 as shown in FIG. And the pilot valve opens. As a result, the refrigerant in the back pressure chamber 44 is led out to the lead-out passage 30 through the pilot valve hole 45, and the pressure in the back pressure chamber 44 is reduced. Here, since the passage section of the orifice 90 is smaller than the passage section of the pilot valve hole 45, a differential pressure in the valve opening direction temporarily acts on the main valve body 40. The main valve body 40 is pushed up by the force of the differential pressure and the biasing force of the spring 46, and the main valve is quickly opened. At this time, the liquid refrigerant having the pressure Pin introduced into the outlet port 24 from the upstream side is squeezed and expanded in the process of passing through the throttle passage 104 of the orifice member 82 to become a mist-like gas-liquid two-phase refrigerant. Then, the refrigerant becomes pressure Pout through the valve chamber 26 and the main valve hole 36, is led out to the lead-out passage 30, and is supplied to the second evaporator on the downstream side.

  4 and 5 are views showing a state in which the electromagnetic valve 12 is assembled to the attachment housing of the evaporator. 4 is a sectional view thereof, and FIG. 5 is a plan view thereof. FIG. 6 is a diagram illustrating the configuration of the connection member 68. (A) is the top view, (B) is AA arrow sectional drawing of (A), (C) is a perspective view.

  As shown in FIG. 4, the mounting housing 110 is provided with a first port 112 to which a pipe extending from the receiver 6 side is connected and a second port 114 to be connected to the inlet of the second evaporator. An accommodation hole 116 is formed so as to communicate with the middle of the refrigerant passage connecting the first port 112 and the second port 114. The accommodation hole 116 has a stepped circular hole shape whose inner diameter is gradually reduced toward the connection point with the refrigerant passage.

  The solenoid valve 12 is inserted into the accommodation hole 116 from the front end side (the side opposite to the solenoid 16) of the body 20. As shown also in FIG. 5, the connection member 68 is fastened to the mounting housing 110 by one bolt 118, whereby the electromagnetic valve 12 is fixed to the mounting housing 110. Since the O-rings 32 and 34 are interposed between the body 20 and the accommodation hole 116, the sealing performance between the electromagnetic valve 12 and the mounting housing 110 is ensured. As shown in FIG. 6, the connection member 68 is made of a plate material having an oval shape in plan view, and has an insertion hole 120 for inserting the upper part of the body 20 and an insertion hole 122 for inserting the bolt 118. The connection member 68 locks the end surface of the body 20 and prevents the body 20 from falling out of the accommodation hole 116.

  The liquid refrigerant introduced into the first port 112 is guided to the introduction passage 28 of the electromagnetic valve 12. The gas-liquid two-phase refrigerant that has passed through the orifice member 82 and the main valve is introduced into the inlet of the second evaporator via the outlet passage 30 and the second port 114.

  As described above, according to the present embodiment, since the second expansion device 9 is configured with a simple configuration in which the orifice member 82 is integrally provided on the body 20 of the electromagnetic valve 12, the electromagnetic valve and the expansion valve are integrated. This can be realized more compactly and at a lower cost than the structure assembled in the housing. Since the orifice member 82 is a fixed orifice, it is difficult to realize highly accurate throttle expansion like the temperature expansion valve of the first expansion device 7, but a battery cooling device like the second expansion device 9. When used as, it can fully exhibit its function. In addition, since the orifice member 82 is separately manufactured and assembled to the body 20, if a plurality of types of orifice members 82 having the same outer shape and different size of the throttle passage 104 are manufactured, the electromagnetic valve 12 is manufactured. Thus, the refrigerant flow rate (tonnage) can be appropriately adjusted. That is, cost reduction can be achieved by sharing parts in the electromagnetic valve 12. In this embodiment, since the orifice member 82 is disposed upstream of the main valve, the main valve is disposed in the gas-liquid two-phase space. For this reason, it becomes possible to prevent or suppress the occurrence of so-called water hammers arranged in the liquid phase space.

[Second Embodiment]
The solenoid valve of the present embodiment is different from the first embodiment in the arrangement of fixed orifices. For this reason, below, it demonstrates centering on difference with 1st Embodiment. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals. FIG. 7 is a cross-sectional view illustrating a configuration of an electromagnetic valve according to the second embodiment.

  The electromagnetic valve 212 is configured by assembling the valve main body 214 and the solenoid 16. A connection portion 268 is integrally formed with the body 220 of the valve body 214. The connection part 268 has substantially the same outer shape as the connection member 68 of the first embodiment. In particular, the orifice member 282 is assembled not in the introduction passage 28 but in the outlet passage 30. That is, the mounting hole 100 is provided immediately below the main valve hole 36, and the orifice member 282 is assembled so as to be inserted through the mounting hole 100. A locking portion 230 that protrudes inward in the radial direction is provided at the upper portion of the outlet passage 30, and the orifice member 282 is prevented from dropping downward by the locking portion 230. The orifice member 282 has a cylindrical shape, and a throttle passage 104 is formed along the axis thereof.

  With such a configuration, the liquid refrigerant flowing through the introduction passage 28 is introduced into the valve chamber 26 as it is. When the main valve is opened, the liquid refrigerant passing through the main valve is squeezed and expanded in the process of passing through the throttle passage 104 to become a mist-like gas-liquid two-phase refrigerant, and is led out to the second evaporator via the lead-out passage 30. The

  Also in the present embodiment, the second expansion device 9 is configured with a simple configuration in which the orifice member 282 is integrally provided on the body 220 of the electromagnetic valve 212. Since the orifice member 282 is disposed on the downstream side of the main valve, a differential pressure toward the inside of the outlet passage 30 acts on the orifice member 282, and the differential pressure causes the orifice member 282 toward the valve chamber 26 side. Is prevented from falling off. For this reason, the press-fitting allowance of the orifice member 282 can be made smaller or omitted than in the first embodiment, and the work of attaching the orifice member 282 to the body 220 is facilitated. Further, since the main valve is arranged in the liquid phase space, there is an advantage that the pressure loss of the refrigerant can be suppressed as compared with the case where the main valve is arranged in the gas phase or the gas-liquid two phase space.

[Third Embodiment]
The solenoid valve of this embodiment is different from the first and second embodiments in the arrangement of fixed orifices. For this reason, below, it demonstrates focusing on the difference with 1st, 2nd embodiment. In the figure, components that are substantially the same as those in the first and second embodiments are denoted by the same reference numerals. FIG. 8 is a cross-sectional view illustrating a configuration of a solenoid valve according to the third embodiment.

  The electromagnetic valve 312 is configured by assembling a valve body 314 and a solenoid 16. The body 320 of the valve body 314 is provided with a mounting hole 100 at the lower end of the outlet passage 30 (the end opposite to the main valve hole 36). The orifice member 282 is press-fitted into the mounting hole 100 from below (that is, the side opposite to the valve chamber 26).

  With such a configuration, the liquid refrigerant flowing through the introduction passage 28 is introduced into the valve chamber 26 as it is. When the main valve is opened, the liquid refrigerant passing through the main valve is squeezed and expanded in the process of passing through the throttle passage 104 to become a mist-like gas-liquid two-phase refrigerant, and is led to the second evaporator via the outlet port 24. The

  Also in the present embodiment, the second expansion device 9 is configured with a simple configuration in which the orifice member 282 is integrally provided on the body 320 of the electromagnetic valve 312. Since the main valve is arranged in the liquid phase space, there is an advantage that the pressure loss of the refrigerant can be suppressed as compared with the case where the main valve is arranged in the gas phase or the gas-liquid two phase space.

[Fourth Embodiment]
The solenoid valve of this embodiment is different from the first to third embodiments in that it is not a pilot operated type but a direct acting type by a solenoid. For this reason, it demonstrates centering on difference with 1st-3rd embodiment. In addition, in the figure, the same code | symbol is attached | subjected about the component substantially the same as 1st-3rd embodiment. FIG. 9 is a cross-sectional view illustrating a configuration of an electromagnetic valve according to the fourth embodiment.

  The electromagnetic valve 412 is configured by assembling a valve body 414 and a solenoid 416. The body 420 of the valve body 414 is provided with a mounting hole 100 at the upper end of the outlet passage 30 (the end on the valve chamber 26 side). An orifice member 482 is attached to the attachment hole 100.

  The main valve body 440 is integrally provided at the lower end central portion of the plunger 452. The main valve body 440 is small like the pilot valve body 76 of the first embodiment and has a tapered shape with a diameter decreasing toward the tip. On the other hand, the throttle passage 104 of the orifice member 482 also serves as the main valve hole 36. A flange portion 490 extending outward in the radial direction is provided in the upper half portion of the orifice member 482, and the flange portion 490 is locked to the body 420. The spring 46 as in the first embodiment is not provided between the guide portion 442 and the main valve body 440.

  With such a configuration, the liquid refrigerant flowing through the introduction passage 28 is introduced into the valve chamber 26 as it is. When the main valve is opened, the liquid refrigerant in the valve chamber 26 is throttled and expanded in the process of passing through the main valve hole 36 (throttle passage 104) to become a mist-like gas-liquid two-phase refrigerant. To the second evaporator.

  Also in this embodiment, the second expansion device 9 is configured with a simple configuration in which the orifice member 482 is integrally provided on the body 420 of the electromagnetic valve 412. Moreover, since it does not have a pilot valve, it becomes a simpler structure than the electromagnetic valve of 1st-3rd embodiment. Further, since the main valve is arranged in the liquid phase space, there is an advantage that the pressure loss of the refrigerant can be suppressed as compared with the case where the main valve is arranged in the gas phase or the gas-liquid two phase space.

[Fifth Embodiment]
The solenoid valve of the present embodiment is different from the first to fourth embodiments in that a fixed orifice is formed integrally with the body. For this reason, it demonstrates centering on difference with 1st-4th embodiment. In addition, in the same figure, the same code | symbol is attached | subjected about the component substantially the same as 1st-4th embodiment. FIG. 10 is a cross-sectional view illustrating a configuration of an electromagnetic valve according to the fifth embodiment.

  The electromagnetic valve 512 is configured by assembling a valve body 514 and a solenoid 16. The body 520 of the valve main body 514 is provided with an orifice 582 at the lower end of the introduction passage 28 (the end opposite to the valve chamber 26). That is, in the first to fourth embodiments, the configuration in which the orifice member is separately manufactured and assembled to the body is shown, but in the present embodiment, the fixed orifice (throttle passage 104) is integrally formed with the body 520. In the present embodiment, due to the structure of the body 20, the introduction passage 28 in which the orifice portion 582 is provided is drilled from the valve chamber 26 side. For this reason, for the convenience of processing, the throttle passage 104 is formed at the end opposite to the valve chamber 26.

  With this configuration, the gas-liquid two-phase refrigerant that has been squeezed and expanded in the orifice portion 582 is introduced into the valve chamber 26 through the introduction passage 28. When the main valve is opened, the refrigerant is led to the second evaporator through the main valve hole 36, the lead-out passage 30, and the lead-out port 24.

  Also in the present embodiment, the second expansion device 9 is configured with a simple configuration in which the orifice portion 582 is integrally provided in the body 520 of the electromagnetic valve 512. In addition, since the orifice portion 582 is formed at the same time as the body 520 is formed, the number of parts can be reduced and costs can be reduced as compared with the case where the orifice member is separately manufactured.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the technical idea of the present invention. Nor.

  In the above embodiment, the solenoid valve is a normally closed valve that is closed when the solenoid is not energized, but is configured as a normally open valve that opens when the solenoid is de-energized and closes the main valve when energized. May be. Even in such a case, the second expansion device is configured with a simple configuration in which the orifice member is integrally provided in the body of the electromagnetic valve.

  In the fifth embodiment, the orifice portion is provided at the lower end portion of the introduction passage 28, but may be provided at the upper end portion of the introduction passage 28. That is, when the passage in which the fixed orifice is provided is formed from the side opposite to the valve chamber, a throttle passage may be formed at the end of the passage on the valve chamber side. Further, the orifice portion may be integrally formed with respect to the outlet passage 30. Furthermore, although the throttle passage is formed so as to penetrate in the axial direction of the body in the above-described embodiment, it may be configured to penetrate in a direction (radial direction or the like) intersecting the body.

  In the above embodiment, as shown in FIG. 1, the gas-liquid separation is performed by the receiver 6 provided on the upstream side of each expansion device. Alternatively, an accumulator may be provided on the upstream side of the compressor 2 instead. Good. The accumulator is a device that separates and stores the refrigerant sent from each evaporator, and has a liquid phase part and a gas phase part. For this reason, even if liquid refrigerant more than expected is derived from the upstream side, the liquid refrigerant can be stored in the liquid phase part, and the refrigerant in the gas phase part can be derived to the compressor 2.

  In addition, this invention is not limited to the said embodiment and modification, A component can be deform | transformed and embodied in the range which does not deviate from a summary. Various inventions may be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments and modifications. Moreover, you may delete some components from all the components shown by the said embodiment and modification.

  DESCRIPTION OF SYMBOLS 1 Refrigeration cycle, 2 Compressor, 4 Condenser, 6 Receiver, 7 1st expansion device, 8 1st evaporator, 9 2nd expansion device, 10 2nd evaporator, 12 Solenoid valve, 14 Valve body, 16 Solenoid, 20 Body, 22 Inlet port, 24 Outlet port, 26 Valve chamber, 28 Inlet passage, 30 Outlet passage, 36 Main valve hole, 40 Main valve body, 45 Pilot valve hole, 50 Core, 52 Plunger, 68 Connecting member, 76 Pilot valve body, 82 Orifice member, 100 mounting hole, 104 throttle passage, 110 mounting housing, 116 receiving hole, 212 solenoid valve, 220 body, 282 Orifice member, 312 solenoid valve, 320 body, 412 solenoid valve, 420 body, 440 main valve body, 48 2 Orifice member, 520 body, 582 Orifice part.

Claims (9)

A body having an internal passage for passing refrigerant;
A valve hole provided in the middle of the internal passage;
A solenoid attached to the body and forming a valve chamber with the valve hole;
A valve body that is disposed in the valve chamber and opens and closes the internal passage in contact with and away from the valve hole according to the driving force of the solenoid;
An orifice provided integrally with the body so as to form a part of the internal passage, and squeezing and expanding the refrigerant;
A solenoid valve comprising:   The solenoid valve according to claim 1, wherein the valve chamber is defined by assembling the solenoid so as to seal one end opening of the body.   The outer diameter of the body has a shape that decreases toward the side opposite to the solenoid so that the body can be inserted into the mounting hole to be attached from the side opposite to the solenoid. 2. The solenoid valve according to 2.   The solenoid valve according to claim 2 or 3, wherein the orifice is made of an orifice member having a throttle passage therein and is assembled to a mounting hole formed in the body. The mounting hole forms a part of the internal passage and is provided to open to the valve chamber,
5. The solenoid valve according to claim 4, wherein the orifice member is inserted from one end opening of the body before the body and the solenoid are assembled, and is attached to the attachment hole.   The electromagnetic valve according to claim 5, wherein the attachment hole is provided on the upstream side of the valve chamber in the internal passage. The mounting hole is provided on the downstream side of the valve chamber in the internal passage;
The electromagnetic valve according to claim 5, wherein the throttle passage and the valve hole are provided integrally.   The electromagnetic valve according to claim 3, wherein the body is fixed to the attachment target via a separate connection member so that the body does not fall out of the accommodation hole.   By opening the valve body, the refrigerant introduced from the upstream side of the refrigeration cycle is expanded through the orifice and supplied to the evaporator, while the valve body is closed. The electromagnetic valve according to any one of claims 1 to 8, wherein an internal passage is shut off and supply of the refrigerant to the evaporator is stopped.

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