Cold and hot water mixing device and shower

Abstract

The cold and hot water mixing device comprises a valve body, a valve element shaft unit, a first valve element part and a second valve element part, the first valve element part is provided with a first water inlet, the first water inlet is communicated with a first water inlet channel of the valve body, and the second valve element part is provided with a second water inlet and a mixed water outlet. The second water inlet is communicated with a second water inlet channel of the valve body, the mixed water outlet is communicated with a mixed water outlet of the valve body, the valve element shaft unit movably penetrates through the first valve element part and the second valve element part in sequence, the peripheral face of the valve element shaft unit is provided with a blocking inclined face, and a driving mechanism is arranged to drive the valve element shaft unit to move back and forth. The first water inlet and / or the second water inlet are / is plugged by the plugging inclined surface in a matched mode, so that the water inlet amount of cold water and hot water is adjusted, mixing and temperature adjusting of the cold water and the hot water are achieved, sliding friction force can be reduced or eliminated, the probability that the valve element shaft unit is stuck is reduced or the valve element shaft unit is prevented from being stuck, and therefore stable and reliable use of the device is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of bathrooms, in particular to a hot and cold water mixing device and a shower. Background Art

[0002] Hot and cold water mixing devices are widely used in the bathroom industry, specifically in hot and cold water faucets or smart bathtubs, etc., and can mix cold and hot water in a certain proportion in the hot and cold water mixing device to achieve the set water temperature.

[0003] The existing hot and cold water mixing device generally adjusts the mixing ratio of cold and hot water through the movement of the valve core shaft, so as to achieve the purpose of controlling the water temperature. However, the existing valve core shaft sleeve is provided with a rubber sealing ring, and is abutted and arranged in parallel with the outer shape of the valve core inner cavity, that is, the rubber sealing ring on the valve core shaft and the inner wall of the valve core inner cavity are interference fit to form a sliding mode of surface friction. When the motor drives the valve core shaft to reciprocate in the valve core inner cavity, the rubber sealing ring and the inner wall of the valve core inner cavity form a large sliding friction force. If the sliding friction force is greater than the driving force of the motor, the motor cannot drive the valve core shaft to continue to reciprocate, that is, the valve core shaft is prone to get stuck, and the water temperature cannot be adjusted or the hot and cold water mixing function fails. Utility Model Content

[0004] To this end, in order to solve the above-mentioned problem, the utility model provides a hot and cold water mixing device and a shower, which can reduce or eliminate sliding friction by avoiding surface friction, thereby reducing the probability of the valve core shaft unit being stuck or preventing the valve core shaft unit from being stuck, thereby ensuring stable and reliable use of the cold and hot water mixing function.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] The utility model provides a hot and cold water mixing device, comprising a valve body, the valve body having a first water inlet channel, a second water inlet channel and a mixed water outlet, and also comprising a valve core shaft unit and a valve core unit that match each other; the valve core unit comprises a first valve core part and a second valve core part arranged in the valve body; the first valve core part has a first water inlet, the first water inlet is connected to the first water inlet channel; the second valve core part has a second water inlet and a mixed water outlet that are connected; the second water inlet is connected to the second water inlet channel, the mixed water outlet is connected to the mixed water outlet; the valve The core shaft unit is movably arranged to pass through the first valve core part and the second valve core part in sequence, and the mixed water outlet and the inner cavity of the first valve core part are connectable; the outer peripheral surface of the valve core shaft unit has a blocking slope, and is equipped with a driving mechanism to drive the valve core shaft unit to move back and forth within the valve body, so that the blocking slope cooperates with the first water inlet to block the first water inlet, so as to adjust the water inlet amount of the first water inlet; and / or, the blocking slope cooperates with the second water inlet to block the second water inlet, so as to adjust the water inlet amount of the second water inlet, so as to form a cold and hot mixed water setting.

[0007] Furthermore, the outer circumferential surface of the valve core shaft unit has a first sealing slope and a second sealing slope that match each other; the valve core shaft unit includes a valve core shaft and a sealing sleeve, the valve core shaft has a sealing end located in the first valve core part, the outer circumferential surface of the sealing end has the first sealing slope, the inner cavity wall of the first valve core part is provided with a first sealing slope that matches the first sealing slope, and the inner side mouth of the first water inlet is located on the first sealing slope; the sealing sleeve is arranged on the other end of the valve core shaft away from the sealing end, and is located in the second valve core part, the outer circumferential surface of the sealing sleeve has the second sealing slope, and the inner cavity wall of the second valve core part is provided with a second sealing slope that matches the second sealing slope surface, and the inner mouth of the second water inlet is located on the second sealing slope; a first sealing area is provided on the side of the first sealing slope facing away from the sealing sleeve, the first sealing area and the inner mouth of the first water inlet are matched to achieve the blocking of the first water inlet, and the first sealing slope is located in other areas outside the first sealing area and a gap is set with the inner cavity wall of the first valve core; a second sealing area is provided on the side of the second sealing slope facing away from the sealing end, the second sealing area and the inner mouth of the second water inlet are matched to achieve the blocking of the second water inlet, and the second sealing slope is located in other areas outside the second sealing area and a gap is set with the inner cavity wall of the second valve core.

[0008] Furthermore, the blocking sleeve is a metal sleeve.

[0009] Furthermore, the metal sleeve is a hollow cone.

[0010] Furthermore, the inner cavity wall of the second valve core portion is provided with a clearance groove that cooperates with the sealing sleeve.

[0011] Furthermore, the outer peripheral surface of the second valve core portion and the inner wall of the valve body are sealed to form a water mixing chamber, and a plurality of ribs for mixing water are arranged in the water mixing chamber; the water mixing chamber is respectively communicated with the second water inlet and the water mixing outlet.

[0012] Furthermore, the driving mechanism includes a motor and a motor seat, the motor seat is fixedly mounted on the valve body to form a sealing fit, and one end of the motor seat close to the valve body abuts against the first valve core portion; the motor is mounted on the motor seat, and its drive shaft passes through the motor seat and is fixedly connected to the valve core shaft unit.

[0013] Furthermore, the first valve core portion and the second valve core portion are both independent valve cores, and the first valve core portion and the second valve core portion are arranged in a straight line with a spacing therebetween. The second valve core portion has a water flow hole and an abutment boss on one end facing the first valve core portion, and the water flow hole is connected to the mixed water outlet. The abutment boss is inserted into the inner wall of the valve body to form a limiting setting; an end cover is provided on the other end of the second valve core portion away from the first valve core portion.

[0014] Furthermore, the first valve core part and the second valve core part are integrally connected valve cores, and the second valve core part has a water flow channel connected to the first water inlet and the mixed water outlet respectively; the first valve core part and the second valve core part form a sealing fit with the inner wall of the valve body respectively.

[0015] The utility model also provides a shower, which at least comprises the above-mentioned hot and cold water mixing device.

[0016] The technical solution provided by the utility model has the following beneficial effects:

[0017] By providing a blocking slope on the outer circumferential surface of the valve core shaft unit and the driving mechanism driving the valve core shaft unit to move back and forth within the valve body, the blocking slope can cooperate with the first water inlet to block the first water inlet, that is, adjust the distance between the blocking slope and the mouth of the first water inlet to adjust the water inlet volume of the first water inlet, and / or the blocking slope cooperates with the second water inlet to block the second water inlet, that is, adjust the distance between the blocking slope and the mouth of the second water inlet to adjust the water inlet volume of the second water inlet. Compared with the surface friction in the prior art, the utility model can reduce or eliminate the sliding friction by avoiding surface friction, so as to reduce the probability of the valve core shaft unit being stuck or prevent the valve core shaft unit from being stuck, thereby ensuring the stable and reliable use of the cold and hot water mixing functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure shows a cross-sectional view of the hot and cold water mixing device in the first embodiment with the valve core shaft at the leftmost extreme end;

[0019] Figure 2 Shown Figure 1 A magnified schematic diagram of area A in the middle;

[0020] Figure 3 Shown is a schematic diagram of the second valve core portion in the first embodiment;

[0021] Figure 4 The figure shows the appearance of the second valve core part in the first embodiment;

[0022] Figure 5 Shown is a schematic diagram of the first valve core portion in the first embodiment;

[0023] Figure 6 The figure shows a cross-sectional view of the hot and cold water mixing device in the first embodiment with the valve core shaft at the rightmost limit end;

[0024] Figure 7 The figure shows the appearance of the hot and cold water mixing device in the first embodiment;

[0025] Figure 8 Shown is an exploded view of the hot and cold water mixing device in Example 1. DETAILED DESCRIPTION

[0026] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0027] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0028] Embodiment 1

[0029] Reference Figures 1 to 6 As shown, the first embodiment provides a hot and cold water mixing device for mixing cold water and hot water in a certain proportion to adjust the water temperature. The hot and cold water mixing device includes a valve body 1, the valve body 1 has a first water inlet channel 11, a second water inlet channel 12 and a mixed water outlet 13, and also includes a valve core shaft unit 2 and a valve core unit that match each other. The valve core unit includes a valve body 1 disposed in the valve body 1 as shown in FIG. Figure 5 The first valve core portion 31 shown in FIG. Figure 3 and Figure 4The second valve core part 32 is shown, and the first valve core part 31 and the second valve core part 32 are respectively sealed with the inner wall of the valve body 1 through the sealing ring 5, the first valve core part 31 has a first water inlet 311, the first water inlet 311 is connected to the first water inlet channel 11, the second valve core part 32 has a second water inlet 321 and a mixed water outlet 322 connected to each other, the second water inlet 321 is connected to the second water inlet channel 12, the mixed water outlet 322 is connected to the mixed water outlet 13, the valve core shaft unit 2 It is movably arranged to pass through the first valve core part 31 and the second valve core part 32 in sequence, and the mixed water outlet 322 and the inner cavity of the first valve core part 31 are connectable, that is, when the valve core shaft unit 2 moves to the rightmost limit end, the opening of the inner cavity of the first valve core part 31 is blocked by the valve core shaft unit 2, and the mixed water outlet 322 and the inner cavity of the first valve core part 31 are not connected; when the valve core shaft unit 2 leaves the rightmost limit end, the mixed water outlet 322 and the inner cavity of the first valve core part 31 are connected.

[0030] The outer peripheral surface of the valve core shaft unit 2 has a matching first sealing slope 211 and a second sealing slope 221, and is equipped with a driving mechanism 4 to drive the valve core shaft unit 2 to move back and forth in the valve body 1, so that the first sealing slope 211 cooperates with the first water inlet 311 to block the first water inlet 311 to adjust the water inlet amount of the first water inlet 311, and the second sealing slope 221 cooperates with the second water inlet 321 to block the second water inlet 321 to adjust the water inlet amount of the second water inlet 321, thereby forming a cold and hot mixed water setting.

[0031] In this embodiment, the first valve core portion 31 and the second valve core portion 32 are both independent valve cores, and the first valve core portion 31 and the second valve core portion 32 are arranged in a straight line with a left-right spacing. The second valve core portion 32 has a water flow hole 326 and an abutment boss 327 toward the left end of the first valve core portion 31, and the water flow hole 326 is connected to the mixed water outlet 322. The abutment boss 327 is inserted into the inner wall of the valve body 1 to form a limiting setting. The right end of the second valve core portion 32 away from the first valve core portion 31 is provided with an end cover 6 to seal the right end of the second valve core portion 32.

[0032] like Figure 6 As shown, the driving mechanism 4 includes a motor 41 and a motor seat 42. The motor seat 42 is fixedly assembled on the valve body 1 and forms a sealing fit, and the motor seat 42 abuts against the first valve core portion 31 near the right end of the valve body 1. The motor 41 is assembled on the motor seat 42, and its driving shaft passes through the motor seat 42 and is fixedly connected to the valve core shaft 21 of the valve core shaft unit 2.

[0033] The first valve core portion 31 and the second valve core portion 32 are arranged on the left and right sides of the valve body 1 , and the first water inlet channel 11 is connected to hot water, and the second water inlet channel 12 is connected to cold water.

[0034] The specific motor 41 is a stepper motor, and the stepper motor controls its driving shaft to move left and right, so as to drive the valve core shaft unit 2 to move left and right accordingly.

[0035] By setting the outer peripheral surface of the valve core shaft unit 2 to a matching first blocking slope 211 and a second blocking slope 221 and a driving mechanism 4 to drive the valve core shaft unit 2 to move back and forth in the valve body 1, the first blocking slope 211 can be used to block the first water inlet 311, that is, to adjust the distance between the first blocking slope 211 and the mouth of the first water inlet 311 to adjust the water inlet amount of the first water inlet 311, and the second blocking slope 221 can be used to block the second water inlet 321, that is, to adjust the distance between the second blocking slope 221 and the mouth of the second water inlet 321 to adjust the water inlet amount of the second water inlet 321. Compared with the surface friction of the prior art, this embodiment can eliminate sliding friction by avoiding surface friction to prevent the valve core shaft unit 2 from being stuck, thereby ensuring the stable and reliable use of the cold and hot water mixing functions.

[0036] Of course, in other embodiments, the number of the blocking slope of the valve core shaft unit 2 can also be one, corresponding to the first water inlet 311 or the second water inlet 321, and a rubber sealing ring of the prior art is correspondingly provided to block the other water inlet. In this way, the probability of the valve core shaft unit being stuck can be reduced, and the stable and reliable use of the cold and hot water mixing functions can be improved to a certain extent.

[0037] In another preferred embodiment, Figure 6 As shown, the valve core shaft unit 2 includes a valve core shaft 21 and a sealing sleeve, the valve core shaft 21 has a sealing end located in the first valve core part 31, the outer peripheral surface of the sealing end has a first sealing slope 211, the inner cavity wall of the first valve core part 31 is provided with a first sealing slope matching the first sealing slope 211, and the inner side mouth of the first water inlet 311 is located on the first sealing slope, the sealing sleeve is arranged on the other end of the valve core shaft 21 away from the sealing end, and is located in the second valve core part 32, the outer peripheral surface of the sealing sleeve has a second sealing slope 221, the inner cavity wall of the second valve core part 32 is provided with a second sealing slope matching the second sealing slope 221, and the inner side mouth of the second water inlet 321 is located on the second sealing slope.

[0038] A first sealing area is provided on the left side of the first blocking slope 211 away from the blocking sleeve, and the first sealing area coincides with the inner opening of the first water inlet 311 to achieve blocking of the first water inlet 311 .

[0039] The first blocking slope 211 is located in other areas outside the first sealing area and is provided with a gap with the inner cavity wall of the first valve core portion 31 to avoid direct contact and eliminate sliding friction.

[0040] A second sealing area is provided on the right side of the second blocking slope 221 away from the sealing end, and the second sealing area is matched with the inner opening of the second water inlet 321 to block the second water inlet 321 to avoid direct contact and eliminate sliding friction.

[0041] In a specific implementation, the blocking sleeve is a copper sleeve 22, which can also be a metal sleeve such as a stainless steel sleeve or an alloy sleeve, and is a hollow cone, which is tapered by the copper sleeve 22 to form a second blocking slope 221 of the copper sleeve 22. At this time, the extension direction of the first blocking slope 211 and the corresponding extension direction of the second blocking slope 221 are respectively as follows: Figure 6 shown.

[0042] The inner cavity wall of the second valve core portion 32 is provided with a clearance groove 323 that matches the blocking sleeve, so as to facilitate the copper sleeve 22 to be fixedly installed in the second valve core portion 32 .

[0043] When the sealing end of the valve core shaft 21 moves to Figure 1 When the leftmost extreme end is shown (i.e., the first sealing area of ​​the first blocking slope 211 is away from the mouth of the first water inlet 311, and the second sealing area of ​​the second blocking slope 221 completely covers the mouth of the second water inlet 321), the second water inlet 321 connected to the cold water is completely blocked and closed, and the first water inlet 311 connected to the hot water is completely opened. At this time, only hot water flows through the inner cavity of the first valve core part 31, the mixed water outlet 322 of the second valve core part 32 and the mixed water outlet 13 of the valve body 1 in sequence, so as to realize the outflow of hot water from the valve body 1.

[0044] When the valve core shaft 21 moves to Figure 6 When the rightmost extreme end is shown (i.e., the first sealing area of ​​the first blocking slope 211 completely covers the mouth of the first water inlet 311, and the second sealing area of ​​the second blocking slope 221 is away from the mouth of the second water inlet 321), the second water inlet 321 connected to the cold water is completely opened, and the first water inlet 311 connected to the hot water is completely blocked and closed. At this time, only cold water flows through the mixed water outlet 322 of the second valve core part 32 and the mixed water outlet 13 of the valve body 1 in turn, so as to realize the outflow of cold water from the valve body 1.

[0045] When the valve core shaft 21 moves to the middle position between the leftmost limit end and the rightmost limit end, half of the hot water flows in from the first water inlet 311 and half of the cold water flows in from the second water inlet 321, so that the cold and hot water flowing out of the valve body 1 are mixed to form mixed water with a suitable water temperature.

[0046] Of course, in other embodiments, the valve core shaft 21 and the sealing sleeve may be made of the same material and formed into a valve core shaft unit 2 by integral molding.

[0047] Further preferably, the outer peripheral surface of the second valve core portion 32 and the inner wall of the valve body 1 are sealed to form a seal as follows: Figure 6 The water mixing chamber 324 shown is provided with a plurality of ribs 325 for mixing water, so as to achieve full mixing of cold and hot water.

[0048] The mixing water chamber 324 is respectively connected to the second water inlet 321 and the mixing water outlet 322, so that both cold water and hot water can flow into the mixing water chamber 324, so as to achieve full and uniform mixing of cold and hot water, adjust the water temperature, and then flow out from the mixing water outlet 13 of the valve body 1 to ensure the user experience.

[0049] like Figure 7 and Figure 8 As shown, the installation method of this specific embodiment is as follows:

[0050] Step 1: Align the drive shaft of the motor 41 with the inner shaft hole of the motor seat 42 and insert it, and align the corresponding screw holes at the same time. Then, fix the motor 41 on the motor seat 42 by screwing or other threaded means, and then fix the internal thread at the left end of the valve core shaft 21 with the external thread of the drive shaft of the motor 41.

[0051] Step 2: The sealing ring 5 is sleeved into the groove on the outer peripheral surface of the right end of the first valve core part 31, and then installed in the inner cavity of the valve body 1 to achieve sealing fit.

[0052] Step three: install the second valve core part 32 in the right inner cavity of the valve body 1, and the outer peripheral surface of the second valve core part 32 located in the mixing water cavity 324 is provided with a second water outlet 328, the second water outlet 328 is connected to the second water inlet 321, and the second water outlet 328 is arranged toward the mixing water cavity 324. At the same time, the abutting boss 327 of the second valve core part 32 is inserted into the inner wall of the valve body 1 to realize the limiting function.

[0053] Step 4: The left end of the valve body 1 and the motor seat 42 are sealed by the sealing ring 5, and then the motor 41 is installed. The valve core shaft 21 passes through the inner cavity of the first valve core part 31, and the drive mechanism 4 and the valve body 1 are fixed by screw connection.

[0054] Step 5: Insert the end of the copper sleeve 22 with a smaller outer diameter toward the inner cavity of the second valve core part 32, and at the same time align the axial hole of the copper sleeve 22 and sleeve it on the right end of the valve core shaft 21, and then install the nut 7 on the external thread on the right end of the valve core shaft 21 to cooperate with the limiting and fixing of the copper sleeve 22, and then install the clamping part of the end cover 6 on the right end of the second valve core part 32 to achieve a sealing fit between the end cover 6 and the second valve core part 32.

[0055] The valve body 1 includes a valve body 14 , a tail cover 15 and two water inlet connectors 16 . The tail cover 15 is screwed onto the right end of the valve body 14 and sealed by a sealing ring 5 to form the valve body 1 . At this time, the tail cover 15 is provided with a mixed water outlet 13 .

[0056] Step 6: Fix the two water inlet connectors 16 to the two water inlets on the lower side of the valve body 14 by screwing, so as to form the corresponding first water inlet channel 11 and second water inlet channel 12, thus completing the installation of the entire hot and cold water mixing device.

[0057] Embodiment 2

[0058] Embodiment 2 provides a cold and hot water mixing device. The structure of embodiment 2 is substantially the same as that of embodiment 1, except that the first valve core portion and the second valve core portion are integrally connected valve cores, and the second valve core portion has a water flow channel respectively connected to the first water inlet and the mixing water outlet, thereby achieving stable and reliable mixing of cold and hot water.

[0059] Of course, the first valve core part and the second valve core part can be integrally formed by integral injection molding, or can be assembled into a whole by screw connection or plug connection.

[0060] Embodiment 3

[0061] Embodiment 3 provides a shower device, which at least includes the hot and cold water mixing device of embodiment 1 or embodiment 2.

[0062] By providing a blocking slope on the outer circumferential surface of the valve core shaft unit and the driving mechanism driving the valve core shaft unit to move back and forth within the valve body, the blocking slope can cooperate with the first water inlet to block the first water inlet, that is, adjust the distance between the blocking slope and the mouth of the first water inlet to adjust the water inlet volume of the first water inlet, and / or the blocking slope cooperates with the second water inlet to block the second water inlet, that is, adjust the distance between the blocking slope and the mouth of the second water inlet to adjust the water inlet volume of the second water inlet. Compared with the surface friction in the prior art, the utility model can reduce or eliminate the sliding friction by avoiding surface friction, so as to reduce the probability of the valve core shaft unit being stuck or prevent the valve core shaft unit from being stuck, thereby ensuring the stable and reliable use of the cold and hot water mixing functions.

[0063] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A hot and cold water mixing device, comprising a valve body, wherein the valve body has a first water inlet channel, a second water inlet channel and a mixed water outlet, characterized in that: Also included are a matching valve core shaft unit and a valve core unit; The valve core unit includes a first valve core portion and a second valve core portion disposed within the valve body; The first valve core part has a first water inlet, which is connected to the first water inlet channel; the second valve core part has a second water inlet and a mixed water outlet which are connected to each other; the second water inlet is connected to the second water inlet channel, and the mixed water outlet is connected to the mixed water outlet; The valve core shaft unit is movably disposed through the first valve core portion and the second valve core portion in sequence, and the mixed water outlet and the inner cavity of the first valve core portion are communicatively disposed; The outer peripheral surface of the valve core shaft unit has a blocking slope, and is equipped with a driving mechanism to drive the valve core shaft unit to move back and forth in the valve body, so that the blocking slope cooperates with the first water inlet to block the first water inlet, so as to adjust the water inlet amount of the first water inlet; And / or, the blocking slope cooperates with the second water inlet to block the second water inlet to adjust the water inlet volume of the second water inlet to form a hot and cold water mixing setting.

2. The hot and cold water mixing device according to claim 1, characterized in that: The outer circumferential surface of the valve core shaft unit has a first blocking slope and a second blocking slope that match each other; the valve core shaft unit includes a valve core shaft and a blocking sleeve, the valve core shaft has a sealing end located in the first valve core part, the outer circumferential surface of the sealing end has the first blocking slope, the inner cavity wall of the first valve core part is provided with a first sealing slope that matches the first blocking slope, and the inner side mouth of the first water inlet is located on the first sealing slope; the blocking sleeve is arranged on the other end of the valve core shaft away from the sealing end, and is located in the second valve core part, the outer circumferential surface of the blocking sleeve has the second blocking slope, and the inner cavity wall of the second valve core part is provided with a second sealing slope that matches the second blocking slope, And the inner mouth of the second water inlet is located on the second sealing slope; a first sealing area is provided on the side of the first sealing slope facing away from the sealing sleeve, the first sealing area and the inner mouth of the first water inlet are matched to achieve the blocking of the first water inlet, and the first sealing slope is located at other areas outside the first sealing area and a gap is set with the inner cavity wall of the first valve core; a second sealing area is provided on the side of the second sealing slope facing away from the sealing end, the second sealing area and the inner mouth of the second water inlet are matched to achieve the blocking of the second water inlet, and the second sealing slope is located at other areas outside the second sealing area and a gap is set with the inner cavity wall of the second valve core.

3. The hot and cold water mixing device according to claim 2, characterized in that: The blocking sleeve is a metal sleeve.

4. The hot and cold water mixing device according to claim 3, characterized in that: The metal sleeve is a hollow cone.

5. The hot and cold water mixing device according to claim 2, characterized in that: The inner cavity wall of the second valve core portion is provided with a clearance groove matching the blocking sleeve.

6. The hot and cold water mixing device according to any one of claims 1 to 5, characterized in that: The outer peripheral surface of the second valve core part and the inner wall of the valve body are sealed to form a water mixing chamber, and a plurality of ribs for mixing water are arranged in the water mixing chamber; the water mixing chamber is communicated with the second water inlet and the water mixing outlet respectively; the first valve core part and the second valve core part are respectively sealed with the inner wall of the valve body.

7. The hot and cold water mixing device according to any one of claims 1 to 5, characterized in that: The driving mechanism includes a motor and a motor seat, wherein the motor seat is fixedly mounted on the valve body to form a sealing fit, and one end of the motor seat close to the valve body abuts against the first valve core portion; the motor is mounted on the motor seat, and its driving shaft passes through the motor seat and is fixedly connected to the valve core shaft unit.

8. The hot and cold water mixing device according to any one of claims 1 to 5, characterized in that: The first valve core portion and the second valve core portion are both independent valve cores, and the first valve core portion and the second valve core portion are arranged in a straight line with a spacing therebetween. The second valve core portion has a water flow hole and an abutment boss on one end facing the first valve core portion, and the water flow hole is connected to the mixed water outlet. The abutment boss is inserted into the inner wall of the valve body to form a limiting setting; an end cover is provided on the other end of the second valve core portion away from the first valve core portion.

9. The hot and cold water mixing device according to any one of claims 1 to 5, characterized in that: The first valve core part and the second valve core part are integrally connected valve cores, and the second valve core part has a water flow channel connected to the first water inlet and the mixed water outlet respectively.

10. A shower, characterized in that: At least comprises the hot and cold water mixing device as described in any one of claims 1-9.

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