JP6046076B2 - Valve body for flow path switching valve - Google Patents

Description

  The present invention relates to a valve element built in a flow path switching valve (such as a four-way switching valve) used in a refrigeration cycle such as an air conditioner.

  Conventionally, there is a slide type flow path switching valve as a flow path switching valve provided in a refrigeration cycle. In this valve switching valve, the saddle-like recess of the valve body is opposed to the valve seat in the valve chamber communicated with the high-pressure side pipe of the refrigeration cycle, the valve body is moved, and the low-pressure of the valve seat is moved by the saddle-like recess. The refrigerant and the one switching port are communicated, and the other switching port is communicated with the high-pressure side piping via the valve chamber to switch the refrigerant flow.

  The saddle-like concave portion of the valve body is a low-pressure side flow path, and the valve body is improved to improve the flow rate on the low-pressure side. As a valve body for this type of flow path switching valve, for example, Japanese Utility Model Publication No. 62-162469 (Patent Document 1), Japanese Patent Application Laid-Open No. 2012-193855 (Patent Document 2), and Japanese Patent No. 5175144 (Patent Document 3). ) And Chinese Utility Model Publication No. 20963922 (Patent Document 4).

  FIG. 10 is a view showing a valve body for the conventional flow path switching valve. The thing of patent document 1 makes the flow path 21A of the low voltage | pressure side of the valve body (slide valve) 21 into the pipe shape, as shown to FIG. 10 (A). The thing of patent document 2 provides the rectification | straightening board 22 in the flow path 21A of the low voltage | pressure side of the valve body 21, as shown to FIG. 10 (B). As shown in FIG. 10 (C), Patent Document 3 discloses that a flange 23a is provided at both ends of the auxiliary pin 23 provided in the flow path 21A on the low pressure side of the valve body 21, and the diameter of the pin itself of the auxiliary pin 23 is provided. Is a narrowed version. The thing of patent document 4 makes the shape of the auxiliary | assistant pin 24 provided in the flow path 21A of the low pressure side of the valve body 21 into the semicircle cross section as shown in FIG.10 (D).

Japanese Utility Model Publication No. 62-162469 JP 2012-193855 A Japanese Patent No. 5175144 China Utility Model Publication No. 20963392 Specification

  In the valve body in patent document 1, when manufacturing a valve body by shaping | molding, there exists a problem that it is difficult to form a pipe shape by integral molding. Further, when another part is provided to form a pipe, there is a problem that the number of parts increases and the number of assembling steps increases.

  In the valve body in Patent Document 2, when the valve body is manufactured by molding, there is a problem similar to Patent Document 1 that it is difficult to form the current plate by integral molding. There is a problem that the number of assembly steps increases as the number of parts increases.

  In the valve body in Patent Document 3, a dedicated auxiliary pin is required for each type of valve body, and there is a problem that the number of parts increases and the number of assembly steps increases. The technique of Patent Document 3 is to improve the strength of the valve body with an auxiliary pin, but the flow rate is also improved by reducing the diameter of the pin of the auxiliary pin itself.

  In the valve body in Patent Document 4, the shape of the auxiliary pin of the valve body is complicated, and the position of the auxiliary pin affects the flow rate, so that it is necessary to perform position management with high accuracy.

  The present invention has been made to solve the above-described problems, and has improved the shape of the bowl-shaped recess that constitutes the flow path on the low pressure side of the valve body of the flow path switching valve, thereby increasing the number of assembly steps. Another object of the present invention is to improve the flow rate (Cv value) on the low pressure side without causing an increase in cost due to an increase in the number of parts.

A valve body for a flow path switching valve according to claim 1 is a valve having a bowl-shaped recess facing a valve seat in which a low pressure port and two switching ports are formed in a valve chamber communicating with a high pressure side pipe of a refrigeration cycle. Body,
The valve port diameter of the low pressure port and the switching port is D (mm),
The pitch between the low-pressure port and the switching port is P (mm),
L (mm) is the length of the recess in the moving direction of the bowl-shaped recess.
The width of the concave portion in the direction perpendicular to the moving direction of the bowl-shaped concave portion is W (mm),
The height of the bowl-shaped recess is H (mm),
When
8mm ≦ D ≦ 12mm ... (1)
1.3 ≦ P / D ≦ 1.7 (2)
1.00 ≦ L / (P + D) ≦ 1.06 (3)
1.05 ≦ W / D ≦ 1.15 (4)
The filling,
0.99 ≦ H / D ≦ 1.39 (5)
It is characterized by being.

The valve body for a flow path switching valve according to claim 2 is the valve body for a flow path switching valve according to claim 1,
1.00 ≦ H / D ≦ 1.10 (5.1)
Or
1.11 ≦ H / D ≦ 1.21 (5.2)
Or
1.24 ≦ H / D ≦ 1.34 (5.3)
It is characterized by being.

  According to the valve body for the flow path switching valve of the first aspect, by setting 0.99 ≦ H / D ≦ 1.39 under the conditions (1) to (4), the flow rate on the low pressure side (Cv Value) can be effectively improved.

  According to the valve body for the flow path switching valve according to claim 2, 1.00 ≦ H / D ≦ 1.10 or 1.11 ≦ H / D ≦ under the conditions (1) to (4). By setting 1.21 or 1.24 ≦ H / D ≦ 1.34 (5.3), the flow rate (Cv value) on the low pressure side can be further effectively improved.

It is a figure which shows the flow-path switching valve which concerns on embodiment of this invention. It is a figure explaining the reference | standard flow volume model used for verification of embodiment. It is a figure explaining the relationship between R dimension of the lower surface opening part of the bowl-shaped recessed part of the valve body of embodiment, and recessed part length. It is a figure which shows the recessed part length (L) of the bowl-shaped recessed part of the valve body of embodiment. It is a figure which shows the change of Cv value with respect to the change of the recessed part length (L) in embodiment. It is a figure which shows the recessed part width (W) of the bowl-shaped recessed part of the valve body of embodiment. It is a figure which shows the change of Cv value with respect to the change of the recessed part width | variety (W) in embodiment. It is a figure which shows the recessed part height (H) of the bowl-shaped recessed part of the valve body of embodiment. It is a figure which shows the change of Cv value with respect to the change of the recessed part height (H) in embodiment. It is a figure which shows an example of the conventional valve body.

  Next, an embodiment of the present invention will be described. FIG. 1 is a view showing a flow path switching valve according to an embodiment. The flow path switching valve according to the embodiment is a four-way switching valve, and a pilot valve (not shown) is connected to the flow path switching valve by a capillary (pipe). The valve housing of the flow path switching valve is composed of a cylindrical cylindrical portion 11 and cap portions 12a and 12b at both ends thereof, and two pistons 14a and 14b connected to each other by a connecting member 13 are accommodated therein. Yes. Thereby, the inside of the valve housing is partitioned into a main valve chamber 11A at the center and two sub valve chambers 11B and 11C on both sides.

  A valve seat 15 is disposed at an intermediate portion in the main valve chamber 11A, and a valve body 10 according to an embodiment that slides in the axis X direction of the valve housing is disposed on the valve seat 15. The valve seat 15 is formed with an E port 15a, an S port 15b, and a C port 15c as "valve ports" arranged in a straight line in the axis X direction of the valve housing. The E port 15a, the S port 15b, An E joint pipe 16a, an S joint pipe 16b, and a C joint pipe 16c are attached to the C port 15c, respectively. Further, a D joint pipe 16d is attached at a position facing the valve seat 15 in the middle part of the valve housing. The E port 15a and the C port 15c are “switching ports”, and the S port 15b is a “low pressure port”.

  The valve body 10 is fitted in the center of the connecting member 13, and the valve body 10 is held with a slight play in the axis X direction with respect to the connecting member 13. Then, a state in which the sub valve chamber 11B is depressurized and a state in which the sub valve chamber 11C is depressurized are switched by a pilot valve switching operation (not shown). Thereby, the valve body 10 moves on the valve seat 15 in the direction of the axis X in conjunction with the pistons 14a and 14b and the connecting member 13.

  The valve body 10 is formed by injection-molding synthetic resin, and has a substantially semi-elliptical bowl-shaped recess 10A inside. A reinforcing pin 101 is passed through the opening of the bowl-shaped recess 10A. The valve body 10 communicates the S port 15b and the E port 15a with a hook-shaped recess 10A at the left end position in FIG. At this time, the C port 15c communicates with the D joint pipe 16d via the main valve chamber 11A. Thereby, as shown by the arrow in FIG. 1, a high pressure side flow path and a low pressure side flow path are formed. In addition, although the example of FIG. 1 has shown the time of air_conditionaing | cooling operation, when valve body 10 will be in the edge part position of the right side of FIG.

  As described above, when the refrigeration cycle is in operation, the inside of the main valve chamber 11A becomes high pressure by the high-pressure refrigerant, and the inside of the bowl-shaped recess 10A of the valve body 10 becomes low pressure by the low-pressure refrigerant. The present invention improves the flow rate (Cv value) of the fluid flowing through the bowl-shaped recess 10A. Next, the shape of the bowl-shaped recess 10A of the valve body 10 of the embodiment will be described.

  First, the dimension that is particularly effective for improving the flow rate in the bowl-shaped recess 10A is the length of the bowl-shaped recess 10A in the axis X direction (the movement direction of the valve body 10) shown in FIG. ) ”)), The width of the hook-shaped recess 10A in the direction orthogonal to the axis X shown in FIG. 6 (hereinafter referred to as“ recess width (W) ”), and the height of the hook-shaped recess 10A shown in FIG. , “Recess height (H)”). In any parameter, the valve port diameter (D) of the E port 15a, S port 15b, and C port 15c, and the pitch in the axis X direction of the E port 15a, S port 15b, and C port 15c (center axis of each port) There is an optimal ratio (ratio) with respect to the inter-port pitch (P) (see FIG. 4), which is the distance between the ports, and the improvement effect decreases if the ratio falls below or exceeds this ratio.

  The flow rate change (change in Cv value) when the ratio of the valve port diameter (D) or the pitch between ports (P) is changed in each parameter will be described below. The effect of improving the Cv value is that the valve port diameter (D) is in the range of φ8 mm to 12 mm, and the ratio (P / D) between the port pitch (P) and the valve port diameter (D) is 1.3 to 1.7. It was confirmed in the range.

  Here, although the verification result about a recessed part length, a recessed part width | variety, and a recessed part height is demonstrated, the reference | standard flow volume model of Cv value improvement used for this verification, and R of the lower surface opening part of the bowl-shaped recessed part 10A of the valve body 10 are demonstrated. The dimensions are as follows.

[Standard flow rate model]
The Cv value of the verification result was calculated by setting the verification result of the Cv value of the reference flow rate model shown in FIG. 2 as “Cv value = 1”. As shown in FIG. 2, the reference flow rate model includes a valve port diameter (D), a pitch between ports (P), a recess length (L), a recess width (W), a recess height (H), and a bowl-shaped recess As the R dimension (R) of the bottom opening,
L = D + P
W = D
H = D
R = D / 2
The conditions are as follows.

[R dimension of the lower surface opening of the bowl-shaped recess 10A]
As shown in FIG. 3, when R dimension = recess width (W) / 2 and the recess length (L) and the recess width (W) are changed, the following is performed. When the recess length (L) was changed, the recess width (W) was fixed, so that only the recess length (L) was changed without changing the R dimension. When the recess width (W) was changed, the R dimension was also changed according to the recess width (W) each time the recess width (W) was changed.

  FIG. 4 is a diagram showing the recess length (L), and FIG. 5 is a diagram showing a change in the Cv value (Cv value ratio = 1 of the reference flow rate model) with respect to the change in the recess length (L). As shown in FIG. 5, when the recess length (L) is smaller than the inter-port pitch (P) + valve port diameter (D), a part of the valve body 10 blocks the flow path, so the Cv value is It tends to decrease. In addition, when the recess length (L) is excessively larger than the inter-port pitch (P) + the valve port diameter (D), the fluid does not smoothly flow into the valve port, so the Cv value tends to decrease. When the ratio of the recess length (L) / [port pitch (P) + valve port diameter (D)] (hereinafter referred to as “length ratio”) is 1.00 to 1.06, the Cv value Was found to be optimal.

  FIG. 6 is a diagram illustrating the recess width (W), and FIG. 7 is a diagram illustrating a change in the Cv value (Cv value ratio = 1 of the reference flow rate model) with respect to the change in the recess width (W). As shown in FIG. 7, since the fluid does not smoothly flow into the valve port unless the recess width (W) is within a predetermined range with respect to the valve port diameter (D), the Cv value tends to decrease. It has been found that the Cv value is optimal when the ratio of the recess width (W) / valve port diameter (D) (hereinafter referred to as “width ratio”) is 1.05 to 1.15.

  FIG. 8 is a diagram showing the recess height (H), and FIG. 9 is a diagram showing a change in the Cv value (reference flow model Cv value ratio = 1) with respect to the change in the recess height (H). FIG. 9 shows the upper and lower limits of the optimum value with the length ratio of 1.00 to 1.06 shown in FIG. 5 and the optimum value with the width ratio of 1.05 to 1.15 shown in FIG. In this range, the case where the recess height (H) is changed is shown. In FIG. 9, the minimum length ratio value “1.00” and the minimum width ratio value “1.05”, the maximum length ratio value “1.06”, and the maximum width ratio value “1. Only the results of verification for 15 ″ are shown.

  Each curve shown in FIG. 9 corresponds to the following conditions. The curve whose peak is indicated by “□” is the case where the valve port diameter (D) = φ8 mm and the length ratio and the width ratio are the maximum values. The curve with the peak indicated by “x” is when the valve port diameter (D) = φ8 mm and the length ratio and width ratio are minimum values, or the valve port diameter (D) = φ12 mm and the length ratio and width ratio are maximum values. It is. The curve with only the peak indicated by “◇” is when the valve port diameter (D) = φ9 mm and the length ratio and the width ratio are the maximum values. The curve with only the peak indicated by “♦” is the case where the valve port diameter (D) = φ9 mm and the length ratio and the width ratio are minimum values. A curve in which only the peak is indicated by “◯” is the case where the valve port diameter (D) = φ11 mm and the length ratio and the width ratio are the maximum values. A curve in which only the peak is indicated by “●” is the case where the valve port diameter (D) = φ11 mm and the length ratio and the width ratio are minimum values. The curve whose peak is indicated by “Δ” is the case where the valve port diameter (D) = φ12 mm and the length ratio and the width ratio are minimum values.

  FIG. 9 illustrates a combination of the length ratio and the width ratio for each valve port diameter in which the length ratio and the width ratio are both maximum values, and the length ratio and the width ratio are both minimum values. ing. However, as a result of verifying the combination that the length ratio is the minimum value and the width ratio is the maximum value, the length ratio is the maximum value and the width ratio is the minimum value, or the combination that the length ratio and the width ratio are both intermediate values, Even in this case, it has been found that the combination of the maximum value and the combination of the minimum value shown in the figure are both within the range in which the Cv value can be improved.

  As shown in FIG. 9, as the overall tendency, as the recess height (H) is increased, the Cv value tends to gradually increase while repeating increase and decrease periodically. It was also found that the ratio of the recess height (H) / valve port diameter (D) (hereinafter referred to as “height ratio”) was 0.99 or more, and the Cv value ratio was always higher than “1”. It was found that the Cv value ratio may be less than “1” in the range where the height ratio indicated by hatching is less than 0.99. It was found that the improvement effect of the Cv value was small in the range where the height ratio indicated by the oblique lines in the figure exceeded 1.39. In addition, in the range exceeding 1.39, since it leads to the increase in the usage-amount of the material of the valve body 10, and the enlargement of a flow-path switching valve, it is not effective.

in this way,
0.99 ≦ H / D ≦ 1.39
If the condition is satisfied, the effect of improving the Cv value is high.

  Furthermore, this height ratio is in the range of 0.99 to 1.39, the height ratio is in the range of 1.00 to 1.10, the height ratio is in the range of 1.11 to 1.21, and the height ratio In the range of 1.24 to 1.34, Cv value peaks appear, and it can be seen that the Cv value can be improved particularly effectively.

in this way,
1.00 ≦ H / D ≦ 1.10 (5.1)
Or
1.11 ≦ H / D ≦ 1.21 (5.2)
Or
1.24 ≦ H / D ≦ 1.34 (5.3)
If this condition is satisfied, the effect of improving the Cv value is even higher.

  A range E1 of the height ratio shown in FIG. 9 is a range where the valve port diameter (D) = φ8 to 9 mm and the optimum height ratio is 1.00 to 1.06. The height ratio range E2 is a range in which the valve port diameter (D) = φ8 to 9 mm and the optimum height ratio is 1.11 to 1.17. The height ratio range E3 is a range in which the valve port diameter (D) = φ8 to 9 mm and the optimum height ratio is 1.24 to 1.30. The height ratio range E4 is a range in which the valve port diameter (D) = φ11 to 12 mm and the optimum height ratio is 1.03 to 1.10. The height ratio range E5 is a range in which the valve port diameter (D) = φ11 to 12 mm and the optimum height ratio is 1.14 to 1.21. The height ratio range E6 is a range in which the valve port diameter (D) = φ11 to 12 mm and the optimum height ratio is 1.27 to 1.34.

  In addition, when considering the balance between the main body size of the flow path switching valve and the flow rate, the range of the height ratio of 1.24 to 1.34 is the optimal dimension, but when it cannot be adopted in consideration of other components, The Cv value can be effectively improved by setting the height ratio in the range of 1.11 to 1.21 or the height ratio in the range of 1.00 to 1.10.

10 Valve body 10A A bowl-shaped recess 15 Valve seat 15a E port 15b S port 15c C port X Axis

Claims (2)

A valve body having a bowl-shaped recess facing a valve seat in which a low pressure port and two switching ports are formed in a valve chamber communicated with a high pressure side pipe of a refrigeration cycle,
The valve port diameter of the low pressure port and the switching port is D (mm),
The pitch between the low-pressure port and the switching port is P (mm),
L (mm) is the length of the recess in the moving direction of the bowl-shaped recess.
The width of the concave portion in the direction perpendicular to the moving direction of the bowl-shaped concave portion is W (mm),
The height of the bowl-shaped recess is H (mm),
When
8mm ≦ D ≦ 12mm ... (1)
1.3 ≦ P / D ≦ 1.7 (2)
1.00 ≦ L / (P + D) ≦ 1.06 (3)
1.05 ≦ W / D ≦ 1.15 (4)
The filling,
0.99 ≦ H / D ≦ 1.39 (5)
A valve element for a flow path switching valve. A valve element for a flow path switching valve according to claim 1,
1.00 ≦ H / D ≦ 1.10 (5.1)
Or
1.11 ≦ H / D ≦ 1.21 (5.2)
Or
1.24 ≦ H / D ≦ 1.34 (5.3)
A valve element for a flow path switching valve.

Images