Cold and hot water mixing device

Abstract

The present invention provides a hot and cold water mixing device which can reduce sliding resistance when a valve body slides relative to a valve housing while maintaining performance capable of cutting off communication between a cold water side gap and a hot water side gap between the valve body and the valve housing. The present invention is a hot and cold water mixing device provided with: a valve body capable of adjusting the inflow amount of cold water from a cold water-side flow path and the inflow amount of hot water from a hot water-side flow path by movement in the axial direction; a valve housing covering the outer peripheral side of the valve body; and an annular cold / hot water partition member disposed between the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing and partitioning the gap between the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing into a cold water-side gap communicating with the cold water-side flow path and a hot water-side gap communicating with the hot water-side flow path. When a pressure difference is generated between the cold water side gap and the hot water side gap, the cold water and hot water separating member is tightly attached to the side wall of the groove part and the outer circumferential surface of the valve body, and is not tightly attached to the inner circumferential surface of the valve shell at the same time.

Description

Technical Field

[0001] The present invention relates to a cold and hot water mixing device. Background Art

[0002] The following cold and hot water mixing device is known. It includes: a cold water side flow path that supplies cold water from a cold water supply source; a hot water side flow path that supplies hot water from a hot water supply source; and a valve body that is cylindrical and configured to be movable in the axial direction. By the movement in the axial direction, the inflow amount of cold water from the cold water side flow path and the inflow amount of hot water from the hot water side flow path can be adjusted.

[0003] Refer to Figure 5 , the outer peripheral side of the valve body 130 is covered by a valve housing 140. On the inner peripheral surface of the valve housing 140, a groove portion 145 for accommodating an O-ring 150 is formed. An elastically deformable O-ring 150 is accommodated in the groove portion 145. The O-ring 150 separates the gap between the outer peripheral surface of the valve body 130 and the inner peripheral surface of the valve housing 140 into a cold water side gap 151 communicating with the cold water side flow path and a hot water side gap 152 communicating with the hot water side flow path.

[0004] Moreover, in a state where there is a pressure difference between the cold water side gap 151 and the hot water side gap 152, as Figure 6 shown, the O-ring 150 is in contact with the side wall of the groove portion 145 on one side while being in contact with both the outer peripheral surface of the valve body 130 and the inner peripheral surface of the valve housing 140. Thus, the communication between the cold water side gap 151 and the hot water side gap 152 is surely cut off (refer to Figure 3 and Figure 4 of Patent Document 1).

[0005] Patent Document Patent Document 1: Japanese Patent No. 6591934 Gazette Summary of the Invention

[0006] However, in the state of the O-ring 150 as Figure 6 shown, it has a sufficient effect for the purpose of cutting off the communication. On the other hand, for example, when the valve body 130 slides relative to the valve housing 140 for a temperature adjustment operation, there is a disadvantage of high sliding resistance.

[0007] The present invention is made based on the above knowledge. The object of the present invention is to provide a cold and hot water mixing device that maintains the performance of cutting off the communication between the cold water side gap and the hot water side gap between the valve body and the valve housing, and at the same time can reduce the sliding resistance when the valve body slides relative to the valve housing.

[0008] The present invention relates to a cold and hot water mixing device, characterized by comprising: a cold water side flow path for supplying cold water from a cold water supply source; a hot water side flow path for supplying hot water from a hot water supply source; a valve body, which is cylindrical and configured to be movable in the axial direction, and by moving in the axial direction, the inflow rate of cold water from the cold water side flow path and the inflow rate of hot water from the hot water side flow path can be adjusted; a valve housing covering the outer peripheral side of the valve body; and an annular cold and hot water separating member disposed between the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing for separating the gap therebetween into a cold water side gap communicating with the cold water side flow path and a hot water side gap communicating with the hot water side flow path. On at least one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing, there is provided a groove portion for accommodating the cold and hot water separating member. In a state where there is a pressure difference between the cold water side gap and the hot water side gap, the cold and hot water separating member is in close contact with the side wall of the groove portion, and at the same time, it is only in close contact with one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing, and is not in close contact with the other of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing.

[0009] According to the present invention, in a state where there is a pressure difference between the cold water side gap and the hot water side gap, the annular cold and hot water separating member is in close contact with the side wall of the groove portion, and at the same time, it is only in close contact with one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing, thereby maintaining the performance of being able to cut off the communication between the cold water side gap and the hot water side gap. Moreover, at the same time, the annular cold and hot water separating member is not in close contact with the other of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing (in the case of the present application for invention, the state of abutting to the extent that no sliding resistance is generated is included in the present invention), and the sliding resistance when the valve body slides relative to the valve housing can be reduced.

[0010] In addition, it is preferable that, in a state where there is a pressure difference between the cold water side gap and the hot water side gap, the cold and hot water separating member is separated from the other of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing.

[0011] At this time, the sliding resistance when the valve body slides relative to the valve housing can be reduced more clearly and surely.

[0012] In addition, it is preferable that the groove portion is provided only on one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing. In a state where there is a pressure difference between the cold water side gap and the hot water side gap, the cold and hot water separating member is only in close contact with the one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing where the groove portion is not provided, and is not in close contact with the one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing where the groove portion is provided.

[0013] The form in which the groove portion is provided only on one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing can not only suppress the cost for forming the groove portion, but also, compared with the case of providing it on both sides, does not require alignment of the grooves on both sides, improving the assemblability.

[0014] In particular, it is preferable that the groove portion is provided only on the inner peripheral surface of the valve housing, and in a state where a pressure difference is generated between the cold water side gap and the hot water side gap, the cold and hot water separating member abuts only against the outer peripheral surface of the valve body and does not abut against the inner peripheral surface of the valve housing.

[0015] Based on the knowledge of the inventors of the present invention, when adopting this form, the annular cold and hot water separating member (usually formed of an elastic member or an elastomeric member (e.g., O-ring)) is installed in a state stretched more than its natural length and abuts against the outer peripheral surface of the valve body by its own elastic force. On the contrary, if it is to abut against the inner peripheral surface of the valve housing, it is necessary to insert it in a state where its outer diameter is more contracted than its natural length. At this time, the possibility of the annular cold and hot water separating member contracting in a skewed state increases, and it is difficult to abut over the entire circumference, deteriorating the communication cut-off performance.

[0016] Moreover, it is preferable that in the groove portion, in the atmosphere open state where the cold and hot water separating member is housed and the stop valve is closed (a state where no pressure difference is generated between the cold water side gap and the hot water side gap), there is an axial gap in the axial direction, and the axial gap is smaller than the moving stroke of the valve body.

[0017] Due to the existence of the axial gap, when the annular cold and hot water separating member bears a pressure difference, it can move sufficiently and rapidly, and the communication cut-off performance can be rapidly exhibited. On the other hand, if the axial gap is too large (if it is more than the moving stroke of the valve body), the state where the annular cold and hot water separating member does not abut against any side wall of the groove portion becomes longer, so it is difficult to effectively exhibit the communication cut-off performance.

[0018] Moreover, it is preferable that in the groove portion, in the atmosphere open state where the cold and hot water separating member is housed and the stop valve is closed (a state where no pressure difference is generated between the cold water side gap and the hot water side gap), there is a radial gap in the direction perpendicular to the axial direction, and the radial gap is smaller than the axial gap.

[0019] Due to the existence of the radial gap, when the annular cold and hot water separating member bears a pressure difference, it can move and deform sufficiently and rapidly, and the communication cut-off performance can be rapidly exhibited. On the other hand, if the radial gap is too large (if it is more than the axial gap), the pressure difference between both sides of the sealing material is released through the radial gap, and the annular cold and hot water separating member cannot effectively bear the pressure difference.

[0020] Moreover, preferably, the axial clearance is smaller than the radial clearance between the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing on the outer side in the axial direction of the groove portion.

[0021] If the axial clearance is of this size, the annular cold and hot water separation member can sufficiently and rapidly withstand the pressure difference and can effectively exhibit the communication cut-off performance.

[0022] In addition, preferably, the radial clearance is smaller than the moving stroke.

[0023] Thus, the amount of cold water passing through the cold water side clearance is liable to be smaller than the amount of cold water flowing into the valve body from the cold water side flow path, and the amount of hot water passing through the hot water side clearance is liable to be smaller than the amount of hot water flowing into the valve body from the hot water side flow path. That is, even when the communication cut-off performance of the annular cold and hot water separation member is lost for some reason, the degree of hindrance to the temperature adjustment function can be reduced by using the cold water passing through the cold water side clearance and / or the hot water passing through the hot water side clearance.

[0024] According to the present invention, in a state where a pressure difference is generated between the cold water side clearance and the hot water side clearance, while being in close contact with the side wall of the groove portion, it is in close contact with one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing, thereby maintaining the performance of being able to cut off the communication between the cold water side clearance and the hot water side clearance. Moreover, at the same time, it is not in close contact with the other of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing, and thus the sliding resistance when the valve body slides relative to the valve housing can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic perspective view of a cold and hot water mixing device according to an embodiment of the present invention. Figure 2 is Figure 1 a cross-sectional view of the cold and hot water mixing device. Figure 3 is Figure 2 an enlarged view of the main part. Figure 4 is Figure 3 an enlarged view of the periphery of the O-ring. Figure 5 is a schematic view of the periphery of a conventional O-ring. Figure 6 is a schematic view showing a state where a conventional O-ring withstands a pressure difference. REFERENCE SIGNS 1 - Cold water supply tap; 2 - Hot water supply tap; 3 - Water discharge port; 4 - Temperature adjustment handle; 4s - Rotation shaft; 5 - Flow rate adjustment handle; 10 - Cold water side flow path; 20 - Hot water side flow path; 30 - Valve body; 31 - Central axis; 32 - Threaded portion; 33 - Stainless steel helical spring; 34 - SMA helical spring; 40 - Valve housing; 45 - Groove portion; 50 - O-ring; 51 - Cold water side clearance; 52 - Hot water side clearance; 100 - Cold and hot water mixing device; 130 - Valve body; 140 - Valve housing; 145 - Groove portion; 150 - O-ring; 151 - Cold water side clearance; 152 - Hot water side clearance; AC - Axial direction clearance; RC - Radial clearance; G - Radial interval. Detailed implementation mode

[0026] Structure Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1 It is a schematic perspective view of a cold and hot water mixing device 100 according to an embodiment of the present invention.

[0027] As Figure 1 shown, the cold and hot water mixing device 100 of the present embodiment is connected, for example, to a cold water supply tap 1 (an example of a cold water supply source) and a hot water supply tap 2 (an example of a hot water supply source) provided on the wall of a bathroom or the like. A water discharge port 3 is provided in the center, a temperature adjustment handle 4 is provided on the left side, and a flow rate adjustment handle 5 is provided on the right side. In addition, although not shown in the drawings, the cold and hot water mixing device 100 of the present embodiment is also connected to a shower head.

[0028] The user rotates the temperature adjustment handle 4, whereby the discharged water temperature can be adjusted to a desired temperature. In addition, the user rotates the flow rate adjustment handle 5, whereby the discharged water volume can be adjusted to a desired volume, and the shower head / faucet can be switched.

[0029] Figure 2 Is Figure 1 A cross-sectional view of the cold and hot water mixing device 100, Figure 3 Is Figure 2 An enlarged view of the main part of Figure 4 Is Figure 3 An enlarged view of the O-ring periphery of

[0030] As Figures 2 to 4 shown, the cold and hot water mixing device 100 of the present embodiment includes: a cold water side flow path 10 for supplying cold water from the cold water supply tap 1; and a hot water side flow path 20 for supplying hot water from the hot water supply tap 2. A substantially cylindrical valve body 30 is arranged to be movable in the axial direction.

[0031] The valve body 30 is connected and fixed to the central shaft 31. On the other hand, the central shaft 31 is supported by the rotary shaft 4s of the temperature control handle 4 through the threaded portion 32. Thus, with the rotation operation of the temperature control handle 4 (i.e., the rotary shaft 4s), the support surface of the stainless steel helical spring 33 moves in the axial direction, and the valve body 30 moves in the axial direction ( Figure 2 and Figure 3 the left and right directions) due to the spring force of the stainless steel helical spring 33. In the valve body 30, due to this movement, the inflow rate of cold water from the cold water side flow path 10 and the inflow rate of hot water from the hot water side flow path 20 change, thereby achieving temperature control.

[0032] In addition, in order to stabilize the temperature control, a force is applied to the central shaft 31 and the valve body 30 from the left side to the right side through the stainless steel helical spring 33, and at the same time, a force is applied from the right side to the left side through the shape memory alloy (SMA) helical spring 34 (when at a high temperature, the elongation force becomes stronger). Thus, if the temperature of the mixed water decreases, the SMA helical spring 34 contracts, and the valve body 30 moves to the right side. Therefore, at this time, the inflow rate of hot water from the hot water side flow path 20 increases. On the contrary, if the temperature of the mixed water increases, the SMA helical spring 34 elongates, and the valve body 30 moves to the left side. Therefore, at this time, the inflow rate of cold water from the cold water side flow path 10 increases.

[0033] The outer peripheral side of the valve body 30 is covered by the valve housing 40. In the present embodiment, on the inner peripheral surface of the valve housing 40 (in other embodiments, instead of or additionally, a groove portion may be provided on the outer peripheral surface of the valve body 30), a groove portion 45 for accommodating the O-ring 50 (an example of an annular cold and hot water separating member) is formed. The groove portion 45 accommodates the O-ring 50 made of rubber or resin that can be elastically deformed. The O-ring 50 separates the gap between the outer peripheral surface of the valve body 30 and the inner peripheral surface of the valve housing 40 into a cold water side gap 51 communicating with the cold water side flow path 10 and a hot water side gap 52 communicating with the hot water side flow path 20.

[0034] Moreover, in a state where there is a pressure difference between the cold water side gap 51 and the hot water side gap 52, the O-ring 50 is pressed against the side wall (on any one side in the axial direction) of the groove portion 45 and at the same time is pressed against the outer peripheral surface of the valve body 30 (an example of one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing), thereby cutting off the communication between the cold water side gap 51 and the hot water side gap 52.

[0035] In addition, at the same time, in a state where there is a pressure difference between the cold water side gap 51 and the hot water side gap 52, the O-ring 50 is not pressed against the inner peripheral surface (the surface facing the inner peripheral side) of the groove portion 45 of the valve housing 40 (an example of the other of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing). Thus, the sliding resistance when the valve body 30 slides relative to the valve housing 40 is reduced.

[0036] In the case of this embodiment, in a state where a pressure difference is generated between the cold water side gap 51 and the hot water side gap 52, the O-ring 50 maintains a state of being separated from the inner peripheral surface (the surface facing the inner peripheral side) of the groove portion 45 of the valve housing 40.

[0037] If a detailed dimensional example is described, in the groove portion 45, in a state where the O-ring 50 is accommodated and the water stop plug is closed in the atmosphere open state (a state where no pressure difference is generated between the cold water side gap 51 and the hot water side gap 52, and thus the O-ring 50 is not deformed), there is an axial gap AC in the axial direction. For example, this axial gap AC is 0.2 mm to 1 mm, which is smaller than the moving stroke of the valve body 30 based on the operation of the temperature adjustment handle 4 (for example, 0.5 mm to 2 mm), and is also smaller than the radial interval G (for example, 0.3 mm to 1.5 mm) between the outer peripheral surface of the valve body 30 outside the groove portion 45 (in the region where there is no groove portion 45) and the inner peripheral surface of the valve housing 40 (moreover, the radial interval G is smaller than the moving stroke of the valve body 30).

[0038] Moreover, in the groove portion 45, in a state where the O-ring 50 is accommodated and the water stop plug is closed in the atmosphere open state (a state where no pressure difference is generated between the cold water side gap 51 and the hot water side gap 52, and thus the O-ring 50 is not deformed), there is a radial gap RC in a direction perpendicular to the axial direction. For example, this radial gap RC is 0 mm to 0.5 mm, which is smaller than the axial gap AC.

[0039] Regarding the dimensions of the O-ring 50, for example, an outer diameter of about 10 to 50 mm, an inner diameter of about 9 to 49 mm, and a height (cross-sectional diameter) of about 1 to 3 mm can be adopted.

[0040] In addition, this embodiment is configured such that the amount of cold water that can pass through the cold water side gap 51 is less than the amount of cold water flowing into the valve body 30 from the cold water side flow path 10, and the amount of hot water that can pass through the hot water side gap 52 is less than the amount of hot water flowing into the valve body 30 from the hot water side flow path 20.

[0041] Function and Effect According to the cold and hot water mixing device 100 of the above-described embodiment, in a state where a pressure difference is generated between the cold water side gap 51 and the hot water side gap 52, the O-ring 50 is in close contact with the side wall of the groove portion 45 and at the same time in close contact with the outer peripheral surface of the valve body 30. Thereby, the performance of being able to cut off the communication between the cold water side gap 51 and the hot water side gap 52 is maintained. Moreover, at the same time, since the O-ring 50 is not in close contact with the inner peripheral surface (the surface facing the inner peripheral side) of the groove portion 45 of the valve housing 40, the sliding resistance when the valve body 30 slides relative to the valve housing 40 is reduced.

[0042] In addition, in the cold and hot water mixing device 100 according to the present embodiment, in a state where a pressure difference is generated between the cold water side gap 51 and the hot water side gap 52, the O-ring 50 leaves the inner peripheral surface of the groove portion 45 of the valve housing 40. As a result, when the valve body 30 slides relative to the valve housing 40, the sliding resistance is more clearly and surely reduced.

[0043] In addition, in the cold and hot water mixing device 100 according to the present embodiment, the groove portion 45 is provided only on the inner peripheral surface of the valve housing 40 and not on the outer peripheral surface of the valve body 30. In this way, according to the form in which the groove portion is provided only on one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing, not only can the cost for forming the groove portion be suppressed, but also compared with the case where it is provided on both sides, it is not necessary to align the grooves on both sides, and the assemblability is improved.

[0044] In particular, based on the knowledge of the inventor of the present invention, as in the cold and hot water mixing device 100 of the present embodiment, when the groove portion 45 is provided only on the inner peripheral surface of the valve housing 40, the O-ring 50 is installed in a state of being stretched more than its natural length and adheres to the outer peripheral surface of the valve body by its own elastic force, and the communication cut-off performance is excellent. (On the contrary, if it adheres to the inner peripheral surface of the valve housing 40, it is necessary to insert it in a state where its outer diameter is more contracted than its natural length, and the possibility that the annular cold and hot water separating member contracts in a skewed state increases, and it is difficult to adhere over the entire circumference, and the communication cut-off performance deteriorates.)

[0045] In addition, in the cold and hot water mixing device 100 according to the present embodiment, in the groove portion 45, in a state where the O-ring 50 is housed and the water stop plug is closed in the air-open state (a state where no pressure difference is generated between the cold water side gap 51 and the hot water side gap 52, and thus the O-ring 50 is not deformed), there is an axial gap AC in the axial direction, and this axial gap AC is smaller than the moving stroke of the valve body 30. Due to the existence of such an axial gap AC, the O-ring 50 can sufficiently and quickly withstand the pressure difference and can effectively exhibit the communication cut-off performance.

[0046] In addition, in the cold and hot water mixing device 100 according to the present embodiment, in the groove portion 45, in a state where the O-ring 50 is housed and the water stop plug is closed in the air-open state (a state where no pressure difference is generated between the cold water side gap 51 and the hot water side gap 52, and thus the O-ring 50 is not deformed), there is a radial gap RC in the direction perpendicular to the axial direction, and this radial gap RC is smaller than the axial gap AC. Even due to the existence of such a radial gap RC, the O-ring 50 can sufficiently and quickly withstand the pressure difference and can effectively exhibit the communication cut-off performance.

[0047] In addition, in the cold and hot water mixing device 100 according to the present embodiment, the axial direction clearance AC is smaller than the radial interval G between the outer peripheral surface of the valve body 30 and the inner peripheral surface of the valve housing 40 on the outside of the groove portion 45. Due to the existence of the axial direction clearance AC having such a feature, the O-ring 50 can sufficiently and rapidly withstand the pressure difference, and the communication cut-off performance can be effectively exerted.

[0048] In addition, in the cold and hot water mixing device 100 according to the present embodiment, the radial interval G is smaller than the moving stroke of the valve body 30. The amount of cold water that can pass through the cold water side clearance 51 is less than the amount of cold water flowing into the valve body 30 from the cold water side flow path 10, and the amount of hot water that can pass through the hot water side clearance 52 is less than the amount of hot water flowing into the valve body from the hot water side flow path 20. Thus, even when the communication cut-off performance of the O-ring 50 is lost for some reason, the degree of hindrance to the temperature adjustment function can be reduced by using the cold water passing through the cold water side clearance 51 and / or the hot water passing through the hot water side clearance 52.

Claims

1. A hot and cold water mixing device, characterized in that: It is equipped with: a cold water side flow path for supplying cold water from a cold water supply source; A hot water side flow path for supplying hot water from a hot water supply source; The valve body is cylindrical and is configured to be movable in the axial direction, and the inflow amount of cold water from the cold water side flow path and the inflow amount of hot water from the hot water side flow path can be adjusted by the movement in the axial direction; A valve housing covering the outer peripheral side of the valve body; and an annular cold and hot water separation member, arranged between the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing, for separating the gap between the two into a cold water side gap connected to the cold water side flow path and a hot water side gap connected to the hot water side flow path, A groove for accommodating the hot and cold water separating member is provided on at least one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing. When a pressure difference is generated between the cold water side gap and the hot water side gap, the cold and hot water separating member is tightly attached to the side wall of the groove portion, and is only tightly attached to one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve shell, and is not tightly attached to the other of the outer peripheral surface of the valve body and the inner peripheral surface of the valve shell.

2. The hot and cold water mixing device according to claim 1, characterized in that: The cold and hot water partitioning member is separated from the other of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing in a state where a pressure difference is generated between the cold water side gap and the hot water side gap.

3. The hot and cold water mixing device according to claim 2, characterized in that: The groove is provided on only one of the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing. When a pressure difference is generated between the cold water side gap and the hot water side gap, the cold and hot water separating member is only tightly attached to the side of the outer circumferential surface of the valve body and the inner circumferential surface of the valve shell where the groove portion is not provided, and is not tightly attached to the outer circumferential surface of the valve body and the inner circumferential surface of the valve shell where the groove portion is provided.

4. The hot and cold water mixing device according to claim 3, characterized in that: The groove is provided only on the inner peripheral surface of the valve housing. In a state where a pressure difference is generated between the cold water side gap and the hot water side gap, the cold and hot water partitioning member is in close contact only with the outer peripheral surface of the valve body, and is not in close contact with the inner peripheral surface of the valve housing.

5. The hot and cold water mixing device according to claim 4, characterized in that: In the groove portion, when the hot and cold water separating member is housed and the water stopper is closed and open to the atmosphere, there is an axial gap in the axial direction. The axial clearance is smaller than the moving stroke of the valve body.

6. The hot and cold water mixing device according to claim 5, characterized in that: In the groove portion, when the hot and cold water separating member is housed and the water stopper is closed and open to the atmosphere, a radial gap exists in a direction perpendicular to the axial direction. The radial gap is smaller than the axial gap.

7. The hot and cold water mixing device according to claim 6, characterized in that: The axial direction gap is smaller than a radial distance between the outer peripheral surface of the valve body and the inner peripheral surface of the valve housing in the outer side of the groove portion.

8. The hot and cold water mixing device according to claim 7, characterized in that: The radial spacing is smaller than the movement stroke.

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