JP5436628B2 - Four-way valve - Google Patents

Description

  The present invention relates to a four-way valve that is preferably used, for example, as a cooling / heating switching valve in a refrigerant circuit of a heat pump air conditioner.

As a conventional four-way valve, a sliding contact surface of at least a valve seat of a switching valve in a switching valve is formed of a self-lubricating resin, and a remaining portion excluding the sliding contact surface of the slide valve is a thermosetting resin, an ester group or an amino group. There is one formed of a crystalline thermoplastic resin having no group (for example, see Patent Document 1).
Further, the port C and the body of the three-way switching valve for switching the port B to communicate with the port A to which the high temperature / high pressure refrigerant is introduced or the port D to which the low temperature / low pressure refrigerant is derived are communicated with the port A or the port D. The three-way switching valve body is separated from each other, the common ports A and D are connected by pipes, the passage through which the refrigerant of each body flows is surrounded by a heat insulating sleeve and a heat insulating plug, and the plug constituting the valve body is thermally conductive Some are made of a material having low properties (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 11-201297 (first page, FIG. 2) Japanese Patent Laying-Open No. 2003-254453 (first page, FIG. 1)

  In the four-way valve exemplified in Patent Document 1, the high-temperature and high-pressure refrigerant from the compressor outlet and the low-temperature and low-pressure refrigerant returning to the compressor inlet flow close to each other, and heat loss due to heat leakage occurs between them. If heat loss occurs, in the heating mode, the heating capacity will be reduced, and the compressor inlet refrigerant gas will be overheated, which will also reduce the compressor efficiency. It was. Further, in the four-way valve exemplified in Patent Document 2, the heat loss inside can be suppressed, but the structure is such that a plug made of a material having low thermal conductivity such as resin is provided in the body. There were problems such as increasing the number and complexity of the structure.

  The present invention has been made to solve the above-described problems of the prior art, and as a result of the inventors conducting extensive research and analysis on the heat loss of the four-way valve, the high-temperature refrigerant is discharged from the inlet channel. When the air flows into the chamber and flows out from the outlet flow path, the surface flow velocity near the wall surface increases due to the collision or contraction of the refrigerant flow at the opening, and the temperature boundary layer becomes thin and heat transfer is reduced. The degree of promotion is several to ten times that of the developed pipe flow. Similarly, heat transfer is promoted in the outlet channel of the low-temperature refrigerant. The main factor is the promotion of heat transfer, and the knowledge that heat loss of high-temperature refrigerant and low-temperature refrigerant occurs intensively between the outlet channels provided in the valve chamber or valve seat, especially in the vicinity of the opening. Completed the invention, with a simple structure and low heat loss due to heat leakage Ku, and its object is to provide a four-way valve which can improve the energy efficiency of the air conditioner.

The four-way valve according to the present invention includes a housing member having a valve chamber, a valve seat having a seat surface provided in the valve chamber, and openings adjacent to each other in the seat surface of the valve seat. The first flow path, the second flow path, and the third flow path that are drawn out of the valve chamber through the valve chamber, and open toward the valve chamber of the housing member to allow a high-temperature fluid to flow in. The fourth flow path is provided so as to move with respect to the seat surface portion of the valve seat, and the high-temperature fluid that has flowed in from the fourth flow path is allowed to flow out to the first flow path. When the low-temperature fluid flowing in from the third flow path is caused to flow out to the second flow path, and the high-temperature fluid flowing from the fourth flow path is allowed to flow out to the third flow path, the first flow A valve body that switches the flow path so that the low-temperature fluid flowing in from the flow path flows out to the second flow path, Refrigerant inside the Kiben body be one rectifying plate is provided which is formed to U-turn, the second flow path and the third flow path, the flow path toward the valve chamber The cross-sectional area is gradually widened .
The four-way valve according to the present invention includes a housing member having a valve chamber, a valve seat having a seat surface portion provided in the valve chamber, and openings adjacent to each other in the seat surface portion of the valve seat. The first flow path, the second flow path, and the third flow path that pass through the valve seat and are drawn out of the valve chamber, and the high-temperature fluid that opens toward the valve chamber of the housing member. A fourth flow path to be introduced and a seat surface portion of the valve seat that is provided so as to move, and when the high-temperature fluid that has flowed in from the fourth flow path is caused to flow out to the first flow path When the low-temperature fluid flowing in from the third flow path is caused to flow out to the second flow path, and the high-temperature fluid flowing from the fourth flow path is flowed out to the third flow path, the above-mentioned A valve body for switching the flow path so that the low-temperature fluid flowing in from the first flow path flows out into the second flow path. Further, a rectifying plate formed so that the refrigerant makes a U-turn is provided inside the valve body, and the first channel has a channel cross-sectional area gradually toward the valve chamber. It is something that has been spread.

According to the present invention, the rectifying plate formed so that the refrigerant makes a U-turn is provided inside the valve body , and further, the separation of the refrigerant flow is suppressed , so that the surface flow velocity near the wall surface is reduced. Without increasing, heat transfer promotion is suppressed, heat transfer is effectively blocked, and heat loss is reduced. For this reason, when used in an air conditioner, the cooling / heating capacity is improved, and further, overheating of the low-temperature refrigerant flowing into the compressor is prevented, the compressor efficiency is improved, and the energy saving performance of the air conditioner is improved.

Sectional drawing which shows notionally the principal part of the four-way valve by Embodiment 1 of this invention. Sectional drawing which shows the modification of the four-way valve shown in FIG. The principal part sectional drawing which shows the other modification of the four-way valve shown in FIG. Sectional drawing which shows the further another modification of the four-way valve shown in FIG. Sectional drawing which shows notionally the principal part of the four-way valve by Embodiment 2 of this invention. Sectional drawing which shows notionally the principal part of the four-way valve by Embodiment 3 of this invention. Sectional drawing which shows notionally the principal part of the four-way valve by Embodiment 4 of this invention. The principal part sectional drawing which shows the modification of the four-way valve shown in FIG. Sectional drawing which shows notionally the principal part of the four-way valve by Embodiment 5 of this invention. Sectional drawing which shows notionally the principal part of the four-way valve by Embodiment 6 of this invention.

Embodiment 1 FIG.
1 to 4 are views for conceptually explaining the main part of a four-way valve according to Embodiment 1 of the present invention. FIG. 1 (a) is a cross-sectional view, and FIG. 1 (b) is a cross-sectional view of FIG. 2 is a cross-sectional view taken along line Ib-Ib, FIG. 2 shows a modification of the four-way valve in FIG. 1, FIG. 2A is a cross-sectional view, and FIG. 2B is IIb-IIb in FIG. FIG. 3 is a cross-sectional view of the main part showing another modification of the four-way valve in FIG. 1, and FIG. 4 is a cross-sectional view showing still another modification of the four-way valve in FIG. In FIG. 1, a four-way valve 10 includes a housing member 5 having both ends of a substantially cylindrical shape having a valve chamber 51, a valve seat 6 having a seat surface portion 61 provided in the valve chamber 51, and the valve Each has an opening 1a, 2a, 3a that is linearly arranged on the seat surface portion 61 of the seat 6 and that is adjacent to each other. A first flow path 1, a second flow path 2, and a third flow path 3, and a pipe-shaped fourth flow path 4 opened to the valve chamber 51 and drawn out of the valve chamber 5; And a valve body 7 provided to slide with respect to the seat surface portion 61 of the valve seat 6.

  In the first embodiment, the valve body 7 is configured using a material having low thermal conductivity such as a resin material. The valve body 7 is configured to move (slide) in the left-right direction in FIG. 1A while being in close contact with the seat surface portion 61 to switch the flow path. Since the known prior art can be used without any particular limitation and is not directly related to the gist of the present invention, the illustration is omitted.

  Between the first flow path 1 and the second flow path 2 and between the second flow path 2 and the third flow path 3 on the lower surface portion of the valve seat 6 in the figure, these flow paths A slit-like or groove-like cut 8 is formed as a thermal resistance portion that suppresses heat transfer between the vicinity of the openings. The first, second, third, and fourth flow paths 1, 2, 3, and 4 are all shown in an indoor heat exchanger, a compressor inlet, an outdoor heat exchanger, And a refrigerant circuit of the heat pump air conditioner, respectively, and a solid line arrow RH indicates a flow of a high temperature refrigerant as a fluid, and a broken line arrow RC indicates a flow of a low temperature refrigerant as a fluid. In the position shown in FIG. 1A, the valve body 7 communicates the fourth flow path 4 and the first flow path 1 while the second flow path 2 and the third flow path 3. The valve chamber 51 is divided into two channels, a channel through which the high-temperature refrigerant RH flows and a channel through which the low-temperature refrigerant RC flows. In this case, a refrigerant circuit configuration in the heating mode is formed. Note that the same reference numerals denote the same or corresponding parts throughout the drawings.

  Next, the operation of the first embodiment configured as shown in FIG. 1 will be described. The high-temperature refrigerant RH discharged from the compressor outlet (not shown) flows into the valve chamber 51 from the fourth channel 4 and is sent to the indoor heat exchanger through the first channel 1. The low-temperature refrigerant RC returned via the outdoor heat exchanger connected in series via the expansion valve (not shown) with respect to the heat exchanger flows into the valve body 7 from the third flow path 3. Then, it makes a U-turn in the valve body 7 and is circulated so as to flow out to the outside from the second flow path 2 and return to the compressor inlet, and the operation in the heating mode is performed. On the other hand, in a state where the valve body 7 is in close contact with the seat surface portion 61, the valve body 7 is slid leftward in FIG. 1A, and the first flow path 1, the second flow path 2, and the third flow path 3 By switching the fourth flow path 4 to a flow path that communicates with each other, the high-temperature refrigerant RH is sent from the fourth flow path 4 to the outdoor heat exchanger through the third flow path 3, and from the indoor heat exchanger. Is switched to the refrigerant circuit configuration in the cooling mode in which the low-temperature refrigerant RC returns from the first flow path 1 to the compressor inlet through the second flow path 2.

  Since the high-temperature refrigerant RH and the low-temperature refrigerant RC flow in the four-way valve 10 in this manner, heat loss due to heat leakage occurs between the two refrigerants. Here, a more detailed analysis of the heat loss of the four-way valve is as follows. That is, in the case of the heating mode, since the high-temperature refrigerant RH flowing in from the fourth flow path 4 becomes a jet and collides with the opening 1a of the first flow path 1 serving as the outlet flow path, and flows out, First, the surface flow velocity near the wall surface 1b is increased by the collision or contraction of the refrigerant flow at the opening 1a of the first flow path 1 and the wall surface 1b immediately after the outflow in the vicinity thereof, and the temperature boundary layer becomes thin and heat transfer Is promoted.

  On the other hand, since the low-temperature refrigerant RC flowing in from the third flow path 3 makes a U-turn in the valve body 7 and flows out from the second flow path 2, the flow is separated before flowing out of the second flow path 2. The surface flow velocity near the flow path wall surface 2b near the opening 2a is increased toward the outer peripheral side, and heat transfer is similarly promoted. These heat transfer enhancement levels range from several times to ten times as much as those of the developed pipe flow. For this reason, the heat loss of the high-temperature refrigerant and the low-temperature refrigerant is mainly caused by this heat transfer promotion, between the first flow path 1 and the second flow path 2, that is, the outlet flow path of the high-temperature refrigerant and the low-temperature refrigerant. Are concentrated in the vicinity of the openings 1a and 2a. In the case of the cooling mode, for the same reason, heat loss is concentrated in the vicinity of the openings 2 a and 3 a between the second flow path 2 and the third flow path 3.

  In the first embodiment, heat is transferred between the first flow path 1 and the second flow path 2, that is, between the first and second flow paths 1 and 2 which are main paths of heat loss. Since the slit-like cut 8 formed in the crossing direction is provided, the thin portion of the valve seat 6 by the cut 8 constitutes a heat resistance portion in the heat transfer direction, and the heat transfer is effectively blocked. As a result, heat loss in the four-way valve 10 is reduced, and the air conditioning capability is improved. Furthermore, since the compressor inlet refrigerant gas can be prevented from being overheated, the compressor efficiency is also improved, and the energy saving performance of the air conditioner is greatly improved. Further, since the effect can be obtained with a relatively simple structure in which the slit-like cut 8 is provided in the main path of heat loss, there is an effect that the cost is not increased.

  It should be noted that the slit-like cut 8 as the heat resistance portion is formed in the outer periphery of the first flow path 1 and the second flow path 2 as shown in the modification example of FIG. 2 and the other modification example of FIG. A bag-like air layer formed by a cut 81 (FIG. 2) formed of an annular recess concentrically with the cross-sectional shape of the flow path, or formed by folding the tip of the pipe material constituting the flow path outward. 82 (FIG. 3) may be used. In the case of the annular cut 81 (FIG. 2), it is possible to prevent the heat from the flow path from diffusing and spreading in the valve body 7 and the valve seat 6, so that the heat transfer between the flow paths is further suppressed, and the air conditioning capability And the energy saving performance of the air conditioner is improved. Similarly, in the case of the bag-shaped air layer 82, heat transfer between the flow paths is further suppressed, and heat diffusion due to heat conduction in the valve seat 6 or the valve chamber 51 can be suppressed, so that heat loss is further reduced. Further reduction.

  These cuts 8 and 81 may be provided on the seat surface 61 side of the valve seat 6, and furthermore, as shown in still another modified example of FIG. 4, heat is alternately applied to both the inner and outer surfaces of the valve seat 6. You may provide the cut | interruption 83 as a resistance part. In this case, compared with the case where the cut 8 is provided on one side as shown in FIG. 1, the strength of the bending is improved and the reliability of the strength is increased when compared with the same cut width (slit width). In comparison, since the cut width (slit width) can be increased, heat transfer between the flow paths can be further reduced.

  In the example shown in FIGS. 1 to 4, the heat resistance portion provided in the vicinity of the opening of the flow path is provided with straight slit-like cuts 8 and 83, an annular cut 81, a bag-like air layer 82, etc. However, even if the heat resistance portion is made of a material having a low thermal conductivity, such as stainless steel, ceramic, hard resin, etc., the same heat shielding effect can be obtained. Furthermore, in the first embodiment, an example in which three flow paths are connected to the valve seat 6 is shown, but it is needless to say that the number of flow paths and the valve type provided in the valve seat 6 are not particularly limited. The same heat shielding effect can be obtained regardless of the number or form. The housing member 5 forming the valve chamber 51 is also configured by using the material having the low thermal conductivity exemplified above, so that the heat loss is further reduced, and by using a material having high strength, the thickness is reduced. A further heat loss reduction effect can be obtained.

Embodiment 2. FIG.
FIGS. 5A and 5B are views for conceptually explaining the main part of a four-way valve according to Embodiment 2 of the present invention. FIG. 5A is a cross-sectional view, and FIG. 5B is Vb− in FIG. It is arrow sectional drawing in the Vb line. In the figure, reference numeral 50 is formed integrally with the valve seat 6, and a seat surface portion 61 having an arcuate cross section of the valve seat 6 is formed at the lower part of the inner peripheral surface constituting the valve chamber 51, so that the entire structure is thin. It is a housing member having a substantially cylindrical shape and closed at both ends. The valve body 7 has a curved surface corresponding to the shape of the seat surface portion 61 of the valve seat 6, and the opening 2 a of the second flow path 2 protrudes into the valve chamber 51 from the seat surface portion 61. The valve body 7 has a function of stopping rotation. Reference numeral 84 denotes a heat resistance portion made of a thin material formed by the valve seat 6 (which is also the housing member 50). Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  In the second embodiment configured as described above, since the valve seat 6 is formed of a thin material integrally with the housing member 50, the valve seat 6 serves as an outlet channel for the high-temperature refrigerant RH. The first channel 1 and the vicinity of the openings 1a and 2a of the second channel 2 serving as the outlet channel for the low-temperature refrigerant RC, or the third channel 3 serving as the outlet channel for the high-temperature refrigerant RH and the low-temperature refrigerant during cooling. The slit-like break in the first embodiment is formed by forming the heat resistance portion 84 between the flow passages in the vicinity of the openings 3a and 2a of the second flow passage 2 serving as the outlet flow passage of the RC to suppress heat transfer. The same effect as that of the heat resistance portion 82 made of 8, 81, 83 or a bag-like air layer can be obtained.

Embodiment 3 FIG.
6 is a sectional view conceptually showing a main part of a four-way valve according to Embodiment 3 of the present invention. In the figure, reference numeral 85 denotes a coating layer as a thermal resistance portion provided on the flow path wall surface in the vicinity of the openings 1a and 2a between the first flow path 1 and the second flow path 2. For the coating layer 85, for example, a material having a low thermal conductivity of around 0.1 W / mK, such as a resin material, can be preferably used, and the film thickness is about 0.1 to 1 mm. In the third embodiment, the thermal resistance portion is formed by a coating layer having a low thermal conductivity instead of the slit-like cut, and the other configuration is the same as that of the first embodiment, and the description thereof is omitted. To do.

  In the third embodiment configured as described above, as in the first embodiment, for example, in the heating mode, it is between the first flow path 1 and the second flow path 2, that is, the refrigerant outlet flow path. Heat transfer enhancement on the flow path wall surfaces near the openings 1a and 2a is a major factor of heat loss. Since the coating layer 85 having low thermal conductivity is applied to this portion, the coating layer 85 is a heat insulating layer. Thus, heat transfer between the adjacent first and second flow paths 1 and 2 is effectively cut off, heat loss in the four-way valve 10 can be greatly reduced, and the energy saving performance of the air conditioner is greatly improved. To do. In addition, since the heat insulating layer can be provided by a relatively simple method, the structure can be simplified. In FIG. 6, the coating layer 85 is applied to a part of the channel wall surface in the vicinity of the openings 1 a and 2 a between the first channel 1 and the second channel 2. However, it may be provided all around the inner peripheral surface in the vicinity of the openings 1a and 2a of the flow path, and if a coating layer is also provided in the vicinity of the opening 3a of the third flow path 3, Even in the mode, the effect of reducing heat loss can be obtained.

Embodiment 4 FIG.
7 and 8 conceptually illustrate the main part of a four-way valve according to Embodiment 4 of the present invention. FIG. 7 (a) is a cross-sectional view and FIG. 7 (b) shows details of the vicinity of the opening. FIG. 8 is an enlarged view and FIG. 8 is a cross-sectional view of the main part showing a modified example (a) of the four-way valve of FIG. In FIG. 7, reference numeral 9 denotes a gas retention layer forming member formed in a tapered funnel shape for forming a gas retention layer 86 as a heat resistance portion. Alternatively, the lower portion of the figure having a small diameter is press-fitted and fixed to the opening 1a or 2a of the second flow path 2 and the flow path is separated from the flow path wall surface in the first flow path 1 or the second flow path 2. Opened on the center side.

  In the fourth embodiment, instead of the coating layer shown in FIG. 6, a gas retention layer 86 in which a gas (refrigerant gas) stays is provided at the above-mentioned site. Since the thermal conductivity of the gas is low, the same heat shielding effect as that of the coating layer can be obtained. In addition, as shown in the modified example of FIG. 8A, the gas retention layer 86 may be configured by a tip bag tube formed by folding the tube end portion inward. Further, as shown in another modification of FIG. 8B, the outer diameter is smaller than that of the pipe inside the pipe (outer pipe) constituting the first flow path 1 (second flow path). A similar effect can be obtained by using a double pipe in which the inner pipe 1c (2c) of the inner pipe is installed with a gap and the gap between the inner pipe 1c (2c) and the outer pipe is used as a gas retention layer 86. .

  In addition, in FIG.8 (b), although the holding | maintenance part of the inner tube | pipe 1c (2c) is not shown, the holding means of this inner tube | pipe 1c (2c) is not specifically limited, For example, only by the lower end part of a figure The upper end on the side of the opening 1a (2a) may be free as shown in FIG. 8B. Further, the gas retention layer 86 may or may not be opened in the valve chamber. Even if the upper end opens to the valve chamber as shown in FIG. 8 (b), the gap between the outer pipe and the pipe is narrow, making it difficult for the refrigerant to flow. be able to. Furthermore, it goes without saying that the gas retention layer 86 may be provided in the opening 3 a of the third flow path 3. As described above, the gas retention layer 86 has a heat insulating effect because it has a lower thermal conductivity than a material such as copper constituting the first to third flow paths 1 to 3, and is a relatively simple method. Since a heat insulating layer can be provided, the structure can be simplified.

Embodiment 5 FIG.
FIG. 9 is a sectional view conceptually showing a main part of a four-way valve according to Embodiment 5 of the present invention. In the drawing, a baffle plate 11 that collides with a high-temperature refrigerant that is a fluid flowing in from the fourth flow path 4 and diffuses into the valve chamber 51 is not shown in the valve chamber 51 with respect to the housing member 5. A rectifying plate 12 that is fixedly provided by a fixing means and is smoothly bent along the flow direction of the refrigerant is fixed to the inside of the valve body 7 by a fixing means not shown in the figure. Is provided. Further, the corners R of the openings 2 a and 3 a between the second flow path 2 and the third flow path 3 are formed in a curved R shape, and the flow path is directed toward the valve chamber 51. The cross-sectional area is gradually widened.

  In the fifth embodiment configured as described above, for example, in the heating mode, in the vicinity between the opening 1a of the first channel 1 serving as the outlet channel and the opening 2a of the second channel 2 In this case, the main factor of heat loss is that heat transfer is promoted by drifting and contracting due to collision of the refrigerant flow, bending, reduction of the flow path area, etc., and increase of the surface flow velocity near the flow path wall surface. This prevents the refrigerant from directly colliding with the opening 1 a of the first flow path 1. Further, when the low-temperature refrigerant flowing in from the third flow path 3 makes a U-turn in the valve body 7 and flows out into the second flow path 2, the corners of the openings 3 a and 2 a are rounded toward the valve chamber 51. Since the flow passage area gradually increases, flow separation is suppressed, and further, the flow is rectified by the rectifying effect of the rectifying plate 12 in the valve body 7, so that the surface flow velocity near the wall surface increases. There is no suppression of heat transfer.

  As described above, according to the fifth embodiment, the first flow path 1 that is the outlet flow path, or the opening 1a of the third flow path 3 or the surface flow velocity in the vicinity of 3a does not increase, and the heat transfer is performed. Promotion is suppressed, heat transfer is effectively blocked, and heat loss is reduced. For this reason, the air conditioning capability is improved, and further, overheating of the low-temperature refrigerant flowing into the compressor is prevented, the compressor efficiency is also improved, and the energy saving performance of the air conditioner is greatly improved. Needless to say, the rectifying plate 12 provided inside the valve body 7 moves together with the valve body 7 when the valve body 7 is slid to the left in the figure during the cooling operation. Moreover, in order to suppress the heat transfer during the cooling operation, it is desirable that the opening 1a of the first flow path 1 has an R shape. Further, even if any one of the baffle plate 11 and the baffle plate 12 is provided alone, a corresponding effect can be obtained. Further, providing the valve seat 6 with a heat resistance portion composed of a cut, an air layer, a thin material, a gas retention layer, a coating layer, or the like shown in the first to fourth embodiments can be expected to further increase the effect.

Embodiment 6 FIG.
FIG. 10 is a sectional view conceptually showing a main part of a four-way valve according to Embodiment 6 of the present invention. In the figure, the valve body 7 has a double structure comprising an inner valve body 7 having the same shape as that of the first embodiment and a rectifying member 71 arranged on the outer side thereof. The upper surface is open, and a passage for guiding the high-temperature refrigerant flowing from the fourth flow path 4 to the first flow path 1 (heating operation) or the third flow path 3 (cooling operation) is formed. Yes.

  In the sixth embodiment configured as described above, similarly to the fifth embodiment, for example, in the heating mode, the rectifying member 71 is provided extending in the vicinity of the opening 4a, whereby the refrigerant is supplied to the valve chamber 51. The first flow path that serves as an outlet flow path is prevented because it directly collides with the inner wall and the opening 1a of the first flow path 1 and the flow is rectified in the passage formed by the outer rectifying member 71. Heat transfer promotion is suppressed without increasing the surface flow velocity near the wall surface in the vicinity of the opening 1a. Further, when the valve body 7 slides on the seat surface portion 61 in the left direction in the drawing and enters the cooling mode, naturally, the flow straightening member 71 is also moved to the left side. 7 passes between the outer peripheral part of 7 and the rectifying member 71 and is guided to the third flow path 3, the same effect of suppressing heat transfer as in the heating mode is obtained. In this way, heat transfer is effectively cut off, heat loss is reduced, air conditioning capacity is improved, and overheating of the low-temperature refrigerant flowing into the compressor is prevented, so that the compressor efficiency is improved and air conditioning is improved. The energy saving performance of the device is greatly improved.

  In the description of the above embodiment, the openings of the three flow paths are linearly arranged in the seat surface portion 61 of the valve seat 6 provided in the valve chamber 51 so that a high-temperature fluid flows into the valve chamber 51. The four-way valve of the type in which the valve body 7 is slidably brought into sliding contact with the seat surface portion 61 has been described as an example, but it is needless to say that the method and the example are not particularly limited thereto. Further, for example, the valve seat 6 shown in FIG. 10 is easily combined with the invention shown in each embodiment, such as providing a cut shown in FIG. 1, and when a plurality of inventions are combined, The heat insulation effect can be further enhanced. Furthermore, although the cuts 8 and 83 have been described in the example provided in the slit shape, the shape is not limited to the slit shape, and the same effect is expected even in the case of, for example, a V-shaped or U-shaped groove. it can.

  DESCRIPTION OF SYMBOLS 1 1st flow path, 1a opening part, 1b Wall surface, 1c inner pipe, 2 2nd flow path, 2a opening part, 2c inner pipe, 3 3rd flow path, 3a opening part, 4 4th flow path , 4a opening, 5, 50 housing member, 51 valve chamber, 6 valve seat, 61 seat surface portion, 7 valve body, 71 rectifying member, 8 heat resistance portion (cut), 81 heat resistance portion (annular cut), 82 Thermal resistance part (air layer), 83 Thermal resistance part (cut), 84 Thermal resistance part (thin material), 85 Thermal resistance part (coating layer), 86 Thermal resistance part (gas retention layer), 9 Gas retention layer forming member 10 Four-way valve, 11 Baffle plate, 12 Rectifier plate, RC fluid (low temperature refrigerant), RH fluid (high temperature refrigerant).

Claims (3)

A housing member having a valve chamber; a valve seat having a seat surface provided in the valve chamber; and an opening adjacent to the seat surface portion of the valve seat. A first flow path, a second flow path, and a third flow path that are drawn out; a fourth flow path that opens toward the valve chamber of the housing member and allows high-temperature fluid to flow; and It is provided so as to move with respect to the seat surface portion of the valve seat, and flows in from the third channel when the high-temperature fluid flowing in from the fourth channel flows out into the first channel. The low temperature fluid that flows out from the first channel when the low temperature fluid flows out into the second channel and the high temperature fluid that flows in from the fourth channel flows into the third channel. And a valve body that switches the flow path so that the fluid flows out to the second flow path, and the refrigerant is U inside the valve body. Be one rectifying plate formed to over down is provided, it said second flow path and the third flow path is a flow path cross-sectional area toward the valve chamber is expanded gradually four-way valve, characterized in that there. A housing member having a valve chamber; a valve seat having a seat surface provided in the valve chamber; and an opening adjacent to the seat surface portion of the valve seat. A first flow path, a second flow path, and a third flow path that are drawn out; a fourth flow path that opens toward the valve chamber of the housing member and allows high-temperature fluid to flow; and It is provided so as to move with respect to the seat surface portion of the valve seat, and flows in from the third channel when the high-temperature fluid flowing in from the fourth channel flows out into the first channel. The low temperature fluid that flows out from the first channel when the low temperature fluid flows out into the second channel and the high temperature fluid that flows in from the fourth channel flows into the third channel. And a valve body that switches the flow path so that the fluid flows out to the second flow path, and the refrigerant is U inside the valve body. Be one rectifying plate formed to over emissions is provided, the first flow path, a four-way, characterized in that the flow passage cross-sectional area toward the valve chamber is gradually widened valve. The four-way valve according to claim 1 or 2 , wherein the current plate is bent smoothly.

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