CN115727154A

CN115727154A - Scale-proof thermostatic valve core

Info

Publication number: CN115727154A
Application number: CN202110990816.3A
Authority: CN
Inventors: 卢文荣; 张汉斌; 石瑞发
Original assignee: Pengwei Xiamen Industry Co ltd
Current assignee: Pengwei Xiamen Industry Co ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2023-03-03
Also published as: GB2612419A; GB202212424D0

Abstract

A scale-proof thermostatic valve core comprises a valve core shell, wherein the valve core shell is provided with an inner cavity, and the valve core shell is provided with a cold water inlet C, a hot water inlet H and a mixed water outlet M; the temperature adjusting component is used for adjusting and controlling the temperature of mixed water; the constant temperature component is used for keeping the temperature of mixed water constant, and at least comprises a thermosensitive element, a movable sleeve and a transmission component for realizing transmission connection between the thermosensitive element and the movable sleeve, wherein the movable sleeve can slide up and down along with the contraction and expansion of the thermosensitive element so as to adjust the opening degrees of the cold water inlet C and the hot water inlet H and further adjust the flow rate of cold water flowing from the cold water inlet C and/or hot water flowing from the hot water inlet H; this design utilizes reasonable design to make at the working process of whole thermostatic cartridge, water can not flow through reset spring, also can not have the contact with overload spring. Thereby effectively preventing the water scale from gathering on the return spring, and the water flow resistance is small, the water flow is stable. And due to the arrangement of the overload spring, the invention has the function of preventing the thermosensitive element from being damaged due to overload in the using process.

Description

Scale-proof thermostatic valve core

Technical Field

The invention relates to bathroom equipment, in particular to a scale-proof thermostatic valve core.

Background

In the sanitary and bathroom industry, thermostatic valve elements are widely used in water heaters and faucets. The thermostatic valve core mainly utilizes the principle of expansion with heat and contraction with cold, when the temperature of hot water or cold water changes suddenly or the water pressure changes suddenly, the thermostatic valve core can sense the temperature change of mixed water through a thermostatic element in the thermostatic valve core and expand or contract along with the temperature change of the mixed water, so that the opening degrees of a hot water inlet and a cold water inlet are changed, and the temperature of the mixed water tends to be constant finally. The thermostatic valve core is also provided with a temperature adjusting component for adjusting the set temperature, such as the patent document disclosed by CN208417615U, and the rotary motion is converted into the linear motion by utilizing the screw rod transmission principle to push the thermostatic element to move. However, when the thermostatic valve core is used for a long time, due to long-term water passing, scale can be accumulated inside the thermostatic valve core, for example, scale can be accumulated at the screw thread of the screw rod on the temperature adjusting component and can be adhered to the return spring, so that the adjusting precision of the thermostatic valve core is affected, and in a severe case, the thermostatic valve core can lose the temperature adjusting capability and the thermostatic capability.

CN205578780U discloses a thermostatic valve core for preventing water from entering a thread in a temperature adjusting component, CN211976071U also discloses a thermostatic valve core for achieving water prevention of the temperature adjusting component, and CN201281166Y discloses an anti-blocking thermostatic valve core. However, water flow in these prior art flows through the return spring, which not only causes large resistance and water flow disorder, but also causes scale to adhere to the return spring easily under long-term use, which affects the adjustment accuracy of the thermostatic valve cartridge, and even may make the thermostatic valve cartridge unusable under the conditions of poor water quality or long idle time.

In view of the above, the present inventors have made extensive studies on the above-mentioned drawbacks of the prior art, and have made this invention.

Disclosure of Invention

A first object of the present invention is to provide a thermostatic cartridge that prevents the accumulation of scale, in particular on a return spring.

The invention also provides a thermostatic valve core which has small water flow resistance, stable water flow and smooth water flow.

A third object of the present invention is to provide a thermostatic cartridge which can prevent a thermosensitive element from being damaged due to overload during use.

In order to realize the purpose, the following scheme is specifically adopted:

a scale resistant thermostatic cartridge comprising:

a cartridge housing having an inner cavity, the cartridge housing having a cold water inlet C, a hot water inlet H, and a mixed water outlet M;

the temperature adjusting component is used for adjusting and controlling the temperature of mixed water;

the constant temperature component is used for keeping the temperature of the mixed water constant, the constant temperature component at least comprises a thermosensitive element, a movable sleeve and a transmission component for realizing transmission connection between the thermosensitive element and the movable sleeve, the movable sleeve can slide up and down along with the contraction and expansion of the thermosensitive element, so that the opening degrees of the cold water inlet C and the hot water inlet H are adjusted, and the inflow flow of cold water from the cold water inlet C and/or the inflow flow of hot water from the hot water inlet H are adjusted;

the movable sleeve is provided with an outer cylinder and an inner cylinder, the transmission assembly comprises a connecting cylinder, the outer cylinder of the movable sleeve is abutted against the wall surface between the cold water inlet C and the hot water inlet H, the inner cylinder of the movable sleeve is fixedly sealed and sleeved on the periphery of the connecting cylinder, the outer surface of the inner cylinder is abutted against the valve core shell in a sealing manner, at least part of the thermosensitive element is fixedly sealed in the connecting cylinder and abutted against the temperature regulating assembly in the connecting cylinder, so that a water-stop part mainly formed by mutually sealing the thermosensitive element, the connecting cylinder, the movable sleeve and the valve core shell is formed, the water-stop part divides the inner cavity of the valve core shell into a water outlet inner cavity and a water-stop inner cavity, the water outlet inner cavity is used for water to pass through, and the water-stop inner cavity is mutually isolated from water;

the valve core is characterized by further comprising at least one reset spring, wherein the reset spring is arranged in the water-proof inner cavity in a compressed state, one end of the reset spring abuts against the transmission assembly, and the other end of the reset spring abuts against the valve core shell, so that the connecting cylinder of the transmission assembly drives the thermosensitive element to always abut against the temperature adjusting assembly.

Furthermore, the valve core shell is provided with a bearing part in an inward extending mode and used for abutting against one end of the reset spring, the inner surface of the bearing part is in sealing abutting contact with the inner cylinder of the movable sleeve, and the bearing part, the inner cylinder of the movable sleeve, the connecting cylinder and the thermosensitive element form a water insulation part which divides the inner cavity of the valve core shell into a water insulation inner cavity and a water drainage inner cavity.

The temperature adjusting assembly is provided with a pushing piece, the transmission assembly mainly comprises a connecting cylinder, a spring fixing seat and a transmission piece, wherein the pushing piece is used for abutting against the thermosensitive element, the connecting cylinder is fixedly sleeved on the periphery of the thermosensitive element in a sealing manner, the upper portion of the connecting cylinder is fixedly connected with the spring fixing seat, the movable sleeve is sleeved below the spring fixing seat and on the periphery of the connecting cylinder in a sealing manner, the lower end of the spring fixing seat abuts against one end of the reset spring, the transmission piece is arranged between the spring fixing seat and the movable sleeve, one end of the transmission piece abuts against the spring fixing seat, the other end of the transmission piece abuts against the movable sleeve, a convex edge is arranged at the bottom of the connecting cylinder in an outward extending manner, and the convex edge is located below an inner cylinder of the movable sleeve and used for pushing up with the movable sleeve.

Furthermore, the temperature adjusting assembly is provided with a pushing piece, the transmission assembly mainly comprises a connecting cylinder, a spring fixing seat and a transmission piece, wherein the pushing piece is used for abutting against the thermosensitive element, the connecting cylinder is fixedly and hermetically sleeved on the periphery of the thermosensitive element, the upper part of the connecting cylinder is fixedly connected with the spring fixing seat, the movable sleeve is hermetically sleeved on the periphery of the connecting cylinder below the spring fixing seat, the lower end of the spring fixing seat abuts against one end of the reset spring, the transmission piece is arranged between the spring fixing seat and the movable sleeve, one end of the transmission piece is fixed with the spring fixing seat, and the other end of the transmission piece is fixed with the movable sleeve.

Furthermore, the transmission part is an overload spring, so that when the movable sleeve cannot move downwards any more, the overload spring can provide a compression stroke for the spring fixing seat to continuously move downwards, and the thermosensitive element cannot be damaged due to the fact that the movable sleeve cannot continuously move downwards.

Further, the valve core shell comprises a valve core upper seat, a valve core shell and a valve core base, wherein an external thread is arranged on the upper portion of the valve core shell and is fixedly connected with a corresponding internal thread of the valve core upper seat in a threaded manner, and an internal thread is arranged on the lower portion of the valve core shell and is fixedly connected with a corresponding external thread of the valve core base in a threaded manner.

Furthermore, at least one fourth sealing ring is arranged at the fixed connection position between the valve core shell and the valve core upper seat, and at least one sealing element is arranged at the fixed connection position between the valve core shell and the valve core base.

Furthermore, the sealing element is a sealing gasket, the sealing gasket can seal the fixed connection position between the valve core shell and the valve core base, and the upper end surface of the sealing gasket can be abutted against the movable sleeve.

Further, the movable sleeve comprises an outer cylinder and an inner cylinder, the outer cylinder is connected with the inner cylinder through a plurality of ribs, and the lower edge of the inner cylinder is higher than that of the outer cylinder.

Further, a cold water inlet C and a hot water inlet H are arranged on the outer wall of the valve core shell and are used for respectively supplying cold water and hot water to flow in, a bearing part is arranged in the valve core shell in an inward extending mode and comprises a cylinder, and the cylinder is tightly abutted to the inner cylinder of the movable sleeve.

Furthermore, the bottom of connecting cylinder outwards extends and sets up the protruding edge of round, in order with the movable sleeve upwards promotes, a connecting cylinder upper portion processing external screw thread with the interior screw-thread fit spiro union of spring fixing base, the inside of connecting cylinder set up an internal thread with the screw-thread fit spiro union of heat-sensitive element periphery to make heat-sensitive element, connecting cylinder and spring fixing base three reciprocal anchorage.

Furthermore, the lower end face of the spring fixing seat extends downwards to form an extension cylinder, the extension cylinder divides the lower end face of the spring fixing seat into two parts, the inner lower end face of the inner ring abuts against one end of the overload spring, and the outer lower end face of the outer ring abuts against one end of the reset spring.

The temperature adjusting assembly mainly comprises a clamping ring, a temperature adjusting screw rod and an urging piece, wherein an external thread is processed at the lower part of the temperature adjusting screw rod, the external thread is matched with an internal thread at the upper part of the urging piece to form a liftable screw rod transmission structure, a clamping edge is arranged at the middle part of the temperature adjusting screw rod, the upper part of the temperature adjusting screw rod extends out of an inner cavity of the upper valve core seat until the clamping edge is clamped with the upper valve core seat, the clamping ring is arranged at the upper part of the temperature adjusting screw rod, and finally, under the combined action of the clamping edge and the clamping ring, the temperature adjusting screw rod is rotatably fixed on the upper valve core seat.

Furthermore, the pushing piece is a sliding sleeve, the upper part of the sliding sleeve is provided with internal threads which are in transmission fit with the external threads of the temperature adjusting screw rod, the periphery of the upper part of the sliding sleeve is provided with a plurality of anti-rotation columns which are clamped with a plurality of clamping grooves arranged in the upper seat of the valve core so as to prevent the sliding sleeve from rotating, the lower part of the sliding sleeve is provided with a connecting rod which is arranged in an inner cavity of the connecting cylinder in a penetrating way, and the bottom end face of the connecting rod is abutted against the upper end face of the thermosensitive element.

Furthermore, at least one first sealing ring is arranged at the fixed connection position between the thermosensitive element and the connecting cylinder, at least one second sealing ring is arranged at the abutting position between the connecting cylinder and the movable sleeve, and at least one third sealing ring is arranged at the tight abutting position between the inner cylinder of the movable sleeve and the cylinder of the valve core shell.

This patent utilizes reasonable structural design, sets up reset spring and overload spring outside the water route, and isolated with rivers, guarantees at the working process of whole thermostatic cartridge, and reset spring can not flowed through to water, also can not have the contact with overload spring. Thereby effectively preventing the water scale from gathering on the return spring, and the water flow resistance is small, the water flow is stable. And due to the arrangement of the overload spring, the invention has the function of preventing the thermosensitive element from being damaged due to overload in the using process.

Drawings

The detailed description, given as a non-limiting example, better explains what the invention includes and can be implemented, and moreover, refers to the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

FIG. 2 is an exploded view of an embodiment of the present invention;

FIG. 3 is a cross-sectional view of key components of an embodiment of the present invention;

FIG. 4-1 is a schematic perspective view of a valve cartridge upper seat of an embodiment of the present invention;

FIG. 4-2 is a perspective cross-sectional view of a valve cartridge upper seat of an embodiment of the present invention;

FIG. 5-1 is a perspective view of a cartridge housing of an embodiment of the present invention;

FIG. 5-2 is a perspective cross-sectional view of a cartridge housing of an embodiment of the present invention;

FIG. 6-1 is a schematic perspective view of a valve cartridge base according to an embodiment of the present invention;

6-2 are perspective cross-sectional views of a cartridge base of an embodiment of the present invention;

FIG. 7 is a perspective view of a temperature adjustment screw according to an embodiment of the present invention;

FIG. 8 is a schematic perspective view of a pusher member of an embodiment of the present invention;

FIG. 9 is a perspective view of a thermistor according to an embodiment of the present invention;

FIG. 10-1 is a perspective view of a connector barrel of an embodiment of the present invention;

FIG. 10-2 is a perspective cross-sectional view of a connector barrel of an embodiment of the present invention;

FIG. 11-1 is a perspective view of a spring holder according to an embodiment of the present invention;

FIG. 11-2 is a perspective cross-sectional view of a spring retainer according to an embodiment of the present invention;

FIG. 12-1 is a perspective view of a holster according to an embodiment of the present invention;

FIG. 12-2 is a perspective cross-sectional view of a slipcase of an embodiment of the present invention;

fig. 13 is a cross-sectional view of an embodiment of the present invention in an overload condition.

Detailed Description

The invention is described in detail below with reference to the figures and the specific embodiments.

It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.

The terms of orientation, up, down, left, right, top, bottom, and the like referred to or may be referred to in this specification, are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.

As shown in fig. 1 and 2, for convenience of description, the present invention is divided into four parts: the temperature adjusting component 1 is used for adjusting the temperature of the mixed water to a set temperature; the constant temperature component 2 is used for keeping the temperature of the mixed water constant at a set temperature; the valve core shell 3 is used for providing a cold water inlet channel, a hot water inlet channel, a mixed water outlet channel, an inner cavity for water flow to pass through and installation spaces for the temperature adjusting component 1 and the constant temperature component 2; a return spring 25 which effects an upward displacement of the thermostatic assembly 2.

Wherein, case shell 3 has hollow inner chamber, and temperature regulating component 1 and the inside of case shell 3 is at least partly arranged to thermostatic assembly 2, and temperature regulating component 1 sets up above thermostatic assembly 2 to heat-sensitive element 22 with thermostatic assembly 2 leans on.

The return spring 25 is mounted on the thermostatic assembly 2 at one end in a compressed state and on the spool housing 3 at the other end, so that the thermostatic assembly 2 is always kept in a state of abutting against the temperature adjusting assembly 2.

The valve core shell 3 is provided with a cold water inlet C for inflow of cold water, a hot water inlet H for inflow of hot water, a mixed water outlet M for outflow of mixed water, and an opening for extending a knob part of the temperature adjusting assembly 1, in one embodiment of the invention, the opening provides an upper part of a temperature adjusting screw rod 12 of the temperature adjusting assembly 1 to extend out, and at least one sealing piece is arranged at the matching part of the temperature adjusting screw rod 12 and the valve core shell 3, so that the opening is sealed.

The thermostatic assembly 2 comprises a heat-sensitive element 22, a movable sleeve 27 and a transmission assembly 20 capable of realizing transmission connection between the heat-sensitive element 22 and the movable sleeve 27, wherein the heat-sensitive element 22 is a paraffin-based heat-sensitive element disclosed in the patent No. CN101523322A or a heat-sensitive element based on a shape memory alloy. The movable sleeve 27 slides along with the thermal element 22 expanding with heat and contracting with cold, and the movable sleeve 27 can slidably control the opening degree of the cold water inlet C and the hot water inlet H, and further control the inflow of cold water from the cold water inlet C and/or the inflow flow of hot water from the hot water inlet H, specifically, the movable sleeve 27, the cold water inlet C and the hot water inlet H cooperate to form a cold water gap C1 and a hot water gap H1 as shown in fig. 1, the size of the cold water gap C1 and the size of the hot water gap H1 correspond to the opening degree of the cold water inlet and the opening degree of the hot water inlet H, when the movable sleeve 27 is at the middle position, the cold water gap C1 and the hot water gap H1 are both in a communicated state, and as the movable sleeve 27 moves upwards, the cold water gap C1 gradually becomes smaller, and when the movable sleeve 27 moves upwards to the blocked position, the cold water gap C1 is closed, and the passage of inflow cold water is blocked; also, as the movable sleeve 27 moves downward, the hot water gap H1 becomes gradually smaller, and when the movable sleeve 27 moves downward to a stopped position, the hot water gap H1 is closed, blocking the passage of the inflow hot water.

In order to facilitate the installation and the disassembly, in an embodiment of the present invention, as shown in fig. 1, 4, 5, and 6, the valve core housing 3 is divided into three parts and fixedly connected together, and a sealing member is disposed at each of the fixed joints of the three parts to seal the joints of the three parts. Specifically, the valve core shell 3 includes a valve core upper seat 31, a valve core shell 32 and a valve core base 33, wherein an external thread is arranged on the upper portion of the valve core shell 32 and fixed with a corresponding internal thread of the valve core upper seat 31 in a threaded manner, and an internal thread is arranged on the lower portion of the valve core shell 32 and fixed with a corresponding external thread of the valve core base 33 in a threaded manner. More preferably, at least one fourth sealing ring 44 is disposed at the threaded fixed connection between the upper seat 31 and the housing 32, and at least one sealing member 28 is disposed at the fixed connection between the housing 32 and the base 33, so that the fixed connection has good waterproof performance. Preferably, the sealing member 28 is a sealing gasket, which not only seals the fixed connection between the valve core housing 32 and the valve core base 33 from water, but also can abut against the movable sleeve 27 at the upper end surface thereof.

The temperature regulating assembly 1 will be further explained below.

The temperature adjusting component 1 mainly realizes the setting of the temperature of mixed water, and the common principle in the technical field is to convert the rotary motion into the linear motion by utilizing the screw rod transmission principle so as to drive the constant temperature component 2 to move. In patent No. CN208417615UCN205578780U, CN211976071U, CN201281166Y, various temperature adjusting components and their installation and matching methods are disclosed, wherein the temperature adjusting components disclosed in the first three patents can prevent water from entering the screw thread matching position of the temperature adjusting component 1, and the temperature adjusting components disclosed in the first three patents can be preferably adopted in the present invention.

More preferably, in a preferred embodiment of the present invention, as shown in fig. 1, 2, 4-1, 4-2, 7, 8, the temperature adjusting assembly 1 is mainly composed of a snap ring 11, a temperature adjusting screw 12 and a pushing member 13. The lower part of the temperature adjusting screw rod 12 is provided with external threads, the external threads are matched with the internal threads on the upper part of the pushing piece 13 to form a liftable screw rod transmission structure, the middle part of the temperature adjusting screw rod 12 is provided with a clamping edge 121, the upper part of the temperature adjusting screw rod 12 extends out of the inner cavity of the upper valve core seat 31 until the clamping edge 121 is clamped with the upper valve core seat 31, the upper part of the temperature adjusting screw rod 12 is provided with a clamping ring 11, and finally, under the combined action of the clamping edge 121 and the clamping ring 11, the temperature adjusting screw rod 12 can be rotatably fixed on the upper valve core seat 31.

The pushing piece 13 is a sliding sleeve, the upper portion of the sliding sleeve 13 is provided with an internal thread which is in transmission fit with the external thread of the temperature adjusting screw rod 12, the preferred thread adopts a rectangular thread which is more suitable for transmission, the periphery of the sliding sleeve 13 is provided with a plurality of anti-rotation posts 131, meanwhile, the inner surface of the valve core upper seat 31 is provided with corresponding clamping grooves 311, and the anti-rotation posts 131 are correspondingly clamped with the clamping grooves 311, so that the sliding sleeve 13 is prevented from rotating. It should be noted that the height of the locking slot 311 is greater than the height of the rotation preventing post 131 to provide a space for the sliding sleeve 13 to move up and down. The lower part of the sliding sleeve 13 is a connecting rod 132, which connecting rod 132 is in abutting engagement with the thermostatic assembly 2. In another embodiment, the sliding sleeve 13 and the connecting rod 132 are designed separately and then fixedly connected together.

The thermostatic assembly 2 and the return spring 25 will be further described below.

The thermostat unit 2 is a unit for maintaining the temperature of the mixed water at a set temperature after the temperature regulating unit 1 sets a desired mixed water temperature. In an embodiment of the present invention, referring to fig. 1 to 13, the thermostatic assembly 2 includes a thermal element 22, a movable sleeve 27, and a transmission assembly 20 for realizing transmission connection between the thermal element 22 and the movable sleeve 27, specifically, the movable sleeve 27 has an outer cylinder 271 and an inner cylinder 272, the transmission assembly 20 includes a connecting cylinder 23, a spring fixing seat 24, and a transmission member 26, wherein the thermal element 22 is disposed below the pushing member 13 and abuts against the pushing member 13 in the connecting cylinder 23, the connecting cylinder 23 is fixedly and hermetically sleeved on the outer periphery of the thermal element 22, and the upper portion of the connecting cylinder 23 is fixedly connected to the spring fixing seat 24, so that the thermal element 22, the connecting cylinder 23, and the spring fixing seat 24 are fixed to each other. The movable sleeve 27 is hermetically sleeved on the periphery of the connecting cylinder 23 below the spring fixing seat 24, the transmission member 26 is sleeved on the periphery of the connecting cylinder 23 between the spring fixing seat 24 and the movable sleeve 27, the connecting cylinder 23 is hermetically abutted against the inner cylinder 272 of the movable sleeve 27, a bearing part 321 is extended in the valve core shell 3, and the bearing part 321 is hermetically abutted against the outer surface of the inner cylinder 272, so that a water stop part 351 which is mainly formed by mutually sealing the thermosensitive element 22, the connecting cylinder 23, the inner cylinder 272 of the movable sleeve 27 and the bearing part 321 of the valve core shell 32 is formed. Since the cold water inlet C and the hot water inlet H are both provided below the water insulating portion 351, the water insulating portion 351 divides the inner cavity of the valve body case 3 into two parts, the water insulating inner cavity 35 located above the water insulating portion 351 and the water passage inner cavity 34 located below the water insulating portion 351. Water enters the water-passing inner cavity 34 through the cold water inlet C and/or the hot water inlet H, and then leaves through the mixed water outlet M, in addition, because the matching position of the temperature-adjusting screw rod 12 and the valve core shell 3 is provided with at least one sealing piece, an opening at the upper end of the valve core shell 3 is sealed, and the water-resisting inner cavity 35 is isolated from water.

Wherein, a return spring 25 is arranged between the spring fixing seat 24 and the bearing part 321, one end of the return spring 25 in a compressed state is installed on the spring fixing seat 24, and the other end is installed on the bearing part 321, so that the thermosensitive element 22 mutually fixed with the spring fixing seat 24 is always abutted against the bottom end face of the connecting rod 132. Thereby reset spring 25 is in water proof inner chamber 35 for reset spring 25 does not contact each other with the water, thereby reset spring 25 can not the adhesion incrustation scale, and then prevents that constant temperature valve core from adjusting the precision and descending because of reset spring 25 adhesion incrustation scale, the condition that even can't use. In addition, because the water flow does not need to pass through the return spring 25, the resistance met by the water flow is reduced, the water flow is more stable, and the water can smoothly pass through the thermostatic valve core.

It should be noted that when the movable sleeve 27 of the thermostatic assembly 2 has been moved down to the blocked position, the hot water inlet is cut off, but if the thermal element 22 continues to expand by heat (when the hot and cold water inlet fails or is abnormal) or the hot water is cut off, the temperature-adjusting screw 12 continues to be rotated to push the slider 13 down against the thermal element 22 (improper operation), such as the above condition is called an overload condition. In the case of an overload, since the movable sleeve 27 cannot move downward and the heat-sensitive element 22 tends to move downward, the heat-sensitive element 22 is easily damaged, especially at the position where the heat-sensitive element 22 is fixedly connected to the connecting cylinder 23, because the heat-sensitive element 22 is more fragile than other parts.

The cooperation between the thermal element 22 and the components of the thermostatic assembly 2 does not generally damage the thermal element 22 in normal operating conditions, but in the case of an overload of the thermostatic assembly 2, protection in the case of an overload of the thermostatic assembly 2 needs to be considered.

In a preferred embodiment, referring to fig. 1, 2, 10-1, 10-2 and 13, the driving member 26 is an overload spring, which is disposed around the connecting cylinder 23 and has an upper end and a lower end abutting against the spring fixing seat 24 and the movable sleeve 27, respectively, and when the movable sleeve 24 can no longer move downward, the overload spring can provide a compression stroke for the spring fixing seat 24 to continue to move downward, so that the thermal sensitive element 22 is not damaged by the fact that the movable sleeve 24 can not continue to move downward. In addition, because the overload spring is abutted between the spring fixing seat 24 and the movable sleeve 27, in this case, the overload spring can only transmit the downward force of the spring fixing seat 24 to the movable sleeve 27 and can not transmit the upward force of the spring fixing seat 24 to the movable sleeve 27, so that a circle of convex edge 231 is arranged at the lower part of the connecting cylinder 23 and extends towards the periphery, the convex edge 231 is arranged below the movable sleeve 27, and when the overload spring can not transmit the upward force of the spring fixing seat 24 to the movable sleeve 27, the upward force of the convex edge 231 is transmitted to the movable sleeve 27, and the movable sleeve 27 moves upwards. Thus, the overload protection of the thermosensitive element 22 is realized on the premise of keeping the transmission fit of the thermosensitive element 22 and the movable sleeve 27. Moreover, the overload spring 26 is also arranged in the water-resisting inner cavity 35, so that the overload spring 26 does not disturb water flow and scale is not accumulated.

In another embodiment, the transmission member 26 is a cylinder, and the upper end and the lower end of the transmission member are fixedly connected, for example welded, to the spring fixing seat 24 and the movable sleeve 27, respectively, and at this time, the heat sensitive element 22, the connecting cylinder 23, the spring fixing seat 24 and the movable sleeve 27 are fixedly connected to each other as a whole, so that the overload protection function of the heat sensitive element 22 described in the previous embodiment is not provided. Preferably, however, the tempering assembly 1 employs a tempering assembly as disclosed in patent No. CN 208417615U: the lower part of the sliding part is a cylinder, an inverted T-shaped spring rod piece is arranged in the cylinder, a spring is sleeved on the inverted T-shaped spring rod piece, and a groove is formed in the lower end face of the inverted T-shaped spring rod piece and is matched and abutted with the thermosensitive element 22 of the thermostatic component 2. With the temperature regulating assembly 1 described above, the spring of the temperature regulating assembly 1 can provide a compression stroke for the temperature regulating assembly 2 to move upward when the movable sleeve 27 moves down to the blocked position, and thus the temperature sensitive element 22 can be prevented from being damaged due to overload.

Specific available structural forms of the movable sleeve 27, the valve core housing 32, the connecting cylinder 23 and the spring fixing seat 24 are respectively given below.

Fig. 12-1 and 12-2 show an exemplary specific structure of the movable sleeve 27, wherein the movable sleeve 27 includes an outer cylinder 271 and an inner cylinder 272, the inner cylinder 272 and the outer cylinder 271 are connected by a plurality of ribs 273, a lower edge of the inner cylinder 272 is higher than a lower edge of the outer cylinder 272, an upper edge of the inner cylinder 272 is higher than an upper edge of the outer cylinder 271, an upper end surface of the inner cylinder 272 is provided with one end of the overload spring 26, the inner cylinder 272 is hermetically sleeved on an outer periphery of the connecting cylinder 23, and a lower edge of the inner cylinder 272 is located above a convex edge 231 of the connecting cylinder 23. Under the normal working condition of the thermostatic valve core, especially when the movable sleeve 27 needs to be moved upwards, the convex edge 231 of the connecting cylinder 23 is abutted against the lower end surface of the inner cylinder 272, and under the overload condition of the thermostatic valve core, the convex edge 231 of the connecting cylinder 23 is separated from the lower edge of the inner cylinder 272 and is not abutted against the lower edge. The inner surface of the inner tube 272 abuts against the outer periphery of the connecting tube 23, and the bearing portion 321 of the spool housing 32 includes a cylinder 3211, and the cylinder 3211 is fitted over the outer surface of the inner tube 272. At least one second sealing ring 42 is arranged at the abutting position of the inner cylinder 272 and the connecting cylinder 23, and at least one third sealing ring 43 is arranged at the abutting position of the inner cylinder 272 and the cylinder 3211, so that the three are in sealing abutting.

The outer surface of the outer cylinder 271 of the movable sleeve 27 slidably abuts against the outer wall 323 of the valve core housing 32, thereby slidably controlling the opening degrees of the cold water inlet C and the hot water inlet H up and down, when the outer cylinder 271 is located at the intermediate position between the cold water inlet C and the hot water inlet H, the cold water inlet C and the hot water inlet H are both in a communicated state, and a cold water gap C1 and a hot water gap H1 are formed at the cold water inlet C and the hot water inlet H, respectively for cold water inflow and hot water inflow. In addition, a groove is arranged on the periphery of the outer cylinder 271 for providing a space for arranging the sealing ring.

Fig. 5-1 and 5-2 show an exemplary specific structure of the valve core housing 32, in which the valve core housing 32 includes an outer wall 323 and a bearing portion 321, in which the bearing portion 321 includes a cylinder 3211 and a supporting portion 3212 connecting the outer wall 323 and the cylinder 3211, a cold water inlet C and a hot water inlet H are opened on the outer wall 323 of the valve core housing 32, the hot water inlet H is disposed below the cold water inlet C, and the supporting portion 3212 is disposed above the cold water inlet C. The cylinder 3211 is used to seal the outer surface of the inner cylinder 272 of the sleeve 27, and the supporting portion 3212 abuts against one end of the return spring 25 to support the return spring.

Fig. 10-1 and 10-2 show an exemplary structure of the connecting cylinder 23, in which a bottom of the connecting cylinder 23 extends outwards to form a circular flange 231, the flange 231 is used for pushing the movable sleeve 27 upwards, an external thread is formed on an upper portion of the connecting cylinder 23 to be in threaded engagement with an internal thread of the spring holder 24, and an internal thread is formed on an inner portion of the connecting cylinder 23 to be in threaded engagement with a thread on an outer periphery of the heat-sensitive element 22, so that the heat-sensitive element 22, the connecting cylinder 32 and the spring holder 24 are fixed to each other. At least one first sealing ring 41 is arranged at the fixed connection position of the thermosensitive element 22 and the connecting cylinder 23 so as to seal the fixed connection position between the thermosensitive element and the connecting cylinder.

Fig. 11-1 and 11-2 show an exemplary specific structure of the spring fixing seat 24, in which an extension tube 241 is extended downward from the lower end surface of the spring fixing seat 24, the extension tube 241 divides the lower end surface of the spring fixing seat 24 into two parts, wherein an inner lower end surface 242 of the inner ring abuts against one end of the overload spring 26, and an outer lower end surface 243 of the outer ring abuts against one end of the return spring 25. An internal thread is processed on the inner surface of the spring fixing seat 24 and is fixed with an external thread on the upper part of the connecting cylinder 23 in a threaded manner. In addition, when the spring fixing seat 24 is needed to help the thermostatic assembly 2 to perform positioning in the left-right direction, the spring fixing seat 24 may be made larger, so that the spring fixing seat 24 abuts against the valve core housing 32.

It is understood that the components fixedly connected together are designed as one body, such as the connecting cylinder 23 and the fixed spring seat 24, and the design still falls into the protection scope of the present invention.

The operation of a preferred embodiment of the present invention will be described below.

Firstly, the temperature adjusting assembly 1 is adjusted to a set temperature, then, water flow enters the water flowing inner cavity 34 of the thermostatic valve core from the cold water inlet C and/or the hot water inlet H, and hot water and cold water are mixed into mixed water in the water flowing inner cavity 34. When the temperature of the hot and/or cold water is abruptly changed or the water pressure is abruptly changed, the temperature of the mixed water is changed, and then the thermo-sensitive element 22 is expanded or contracted accordingly. When the temperature of the mixed water is too high, the thermosensitive element 22 expands, and the upper end surface of the thermosensitive element abuts against the connecting rod 132 of the temperature adjusting assembly 1, so that the connecting cylinder 23 and the spring fixing seat 24 are driven to move downwards, the return spring 25 is compressed, the movable sleeve 27 is driven to move downwards by the overload spring 26, the opening degree of the hot water inlet H is reduced, and the opening degree of the cold water inlet C is increased. After the hot water inlet H is completely closed, if the movable sleeve 27 cannot move downwards due to improper operation and/or abnormal water inlet, and the heat-sensitive element 22 tends to move downwards, the overload spring 26 can provide a compression stroke for the spring fixing seat 24 to continue to move downwards, thereby avoiding the possibility of damage to the heat-sensitive element 22. When the temperature of the mixed water is too low, the thermosensitive element 22 shrinks, and the return spring 25 is always in a compressed state, so that the return spring 25 provides a return force to push the spring fixing seat 24, and the movable sleeve 27 is pushed upwards by the convex edge 231 of the connecting cylinder 23, so that the opening degree of the hot water inlet H is increased, and the opening degree of the cold water inlet C is reduced.

During the entire operation of the thermostatic cartridge, water does not flow through the return spring 25 and does not come into contact with the overload spring 26. Thereby effectively preventing the water scale from gathering on the return spring 25, and the water flow resistance is small and the water flow is stable. And the overload spring 26 is arranged, so that the invention has the function of preventing the thermosensitive element 22 from being damaged due to overload during use.

It should be understood that all of the above preferred embodiments are exemplary and not restrictive, and that various modifications and changes in the specific embodiments described above may be made by those skilled in the art without departing from the spirit of the invention.

Claims

1. The utility model provides a scale prevention thermostatic cartridge which characterized in that includes:

the water mixing valve comprises a valve core shell (3), wherein the valve core shell (3) is provided with an inner cavity, and the valve core shell (3) is provided with a cold water inlet C, a hot water inlet H and a mixed water outlet M;

the temperature adjusting component (1), the temperature adjusting component (1) is used for adjusting and controlling the temperature of mixed water;

the constant temperature component (2) is used for keeping the temperature of mixed water constant, the constant temperature component (2) at least comprises a thermosensitive element (22), a movable sleeve (27) and a transmission component (20) for realizing transmission connection between the thermosensitive element (22) and the movable sleeve (27), and the movable sleeve (27) can slide up and down along with the contraction and expansion of the thermosensitive element (22) so as to adjust the opening degrees of the cold water inlet C and the hot water inlet H and further adjust the inflow flow of cold water from the cold water inlet C and/or the inflow flow of hot water from the hot water inlet H;

the movable sleeve (27) is provided with an outer cylinder (271) and an inner cylinder (272), the transmission assembly (20) comprises a connecting cylinder (23), the outer cylinder (271) of the movable sleeve (27) abuts against the wall surface between the cold water inlet C and the hot water inlet H, the inner cylinder (272) of the movable sleeve (27) is fixedly sealed and hermetically sleeved on the periphery of the connecting cylinder (23), the outer surface of the inner cylinder (272) abuts against the valve core shell (3) in a sealing manner, the thermosensitive element (22) is at least partially fixed in the connecting cylinder (23) in a sealing manner, and abuts against the temperature regulating assembly (1) in the connecting cylinder (23), so that a waterproof part (351) mainly formed by the thermosensitive element (22), the connecting cylinder (23), the movable sleeve (27) and the valve core shell (3) in a sealing manner is formed, the waterproof part (351) is used for separating the inner cavity of the valve core shell (3) into a water outlet inner cavity (34) and a water outlet inner cavity (35), wherein the water outlet inner cavity (34) is used for supplying water and the water outlet inner cavity (35) is isolated from the water outlet cavity;

the temperature control valve further comprises at least one reset spring (25), wherein the reset spring (25) is arranged in the water-resisting inner cavity (35) in a compression state, one end of the reset spring (25) abuts against the transmission assembly (20), and the other end of the reset spring (25) abuts against the valve core shell (3), so that the connecting cylinder (23) of the transmission assembly (20) drives the thermosensitive element (22) to always abut against the temperature regulating assembly (1).

2. The anti-scale thermostatic cartridge of claim 1, wherein: the valve core shell (3) is provided with a bearing part (321) extending inwards and used for abutting against one end of the return spring (25), the inner surface of the bearing part (321) is in sealing abutting contact with the inner cylinder (272) of the movable sleeve (27), and the bearing part (321), the inner cylinder (272) of the movable sleeve (27), the connecting cylinder (23) and the thermosensitive element (22) form a water-stop part (351) which divides the inner cavity of the valve core shell (3) into a water-stop inner cavity (35) and a water-flowing inner cavity (34).

3. The anti-scale thermostatic cartridge of claim 2, wherein: the temperature adjusting assembly (1) is provided with a pushing piece (13), the transmission assembly (20) mainly comprises a connecting cylinder (23), a spring fixing seat (24) and a transmission piece (26), wherein the pushing piece (13) is used for abutting against the thermosensitive element (22), the connecting cylinder (23) is fixedly sleeved on the periphery of the thermosensitive element (22) in a sealing manner, the upper part of the connecting cylinder (23) is fixedly connected with the spring fixing seat (24), the movable sleeve (27) is sleeved on the periphery of the connecting cylinder (23) below the spring fixing seat (24), the lower end of the spring fixing seat (24) abuts against one end of the reset spring (25), the transmission piece (26) is arranged between the spring fixing seat (24) and the movable sleeve (27), one end of the transmission piece (26) abuts against the spring fixing seat (24), the other end of the transmission piece abuts against the movable sleeve (27), the bottom of the connecting cylinder (23) extends outwards to form a protruding edge (231), and the protruding edge (231) is located below an inner cylinder (272) of the movable sleeve (27) and is used for pushing upwards.

4. The anti-scale thermostatic cartridge of claim 2, wherein: the temperature adjusting assembly (1) is provided with a pushing piece (13), the transmission assembly (20) mainly comprises a connecting cylinder (23), a spring fixing seat (24) and a transmission piece (26), wherein the pushing piece (13) is used for abutting against the thermosensitive element (22), the connecting cylinder (23) is fixedly sleeved on the periphery of the thermosensitive element (22) in a sealing manner, the upper part of the connecting cylinder (23) is fixedly connected with the spring fixing seat (24), the movable sleeve (27) is sleeved on the periphery of the connecting cylinder (23) below the spring fixing seat (24), the lower end of the spring fixing seat (24) abuts against one end of the reset spring (25), the transmission piece (26) is arranged between the spring fixing seat (24) and the movable sleeve (27), one end of the transmission piece (26) is fixed with the spring fixing seat (24), and the other end of the transmission piece is fixed with the movable sleeve (27).

5. A scale resistant thermostatic cartridge as set forth in claim 3,

the method is characterized in that: the transmission member (26) is an overload spring, so that when the movable sleeve (24) cannot move downwards any more, the overload spring can provide a compression stroke for the spring fixing seat (24) to continuously move downwards, and the thermosensitive element (22) cannot be damaged due to the fact that the movable sleeve (24) cannot continuously move downwards.

6. The anti-scaling thermostatic cartridge of claim 1, wherein: the valve core shell (3) comprises a valve core upper seat (31), a valve core shell (32) and a valve core base (33), wherein the upper part of the valve core shell (32) is provided with an external thread which is fixed with a corresponding internal thread of the valve core upper seat (31) in a threaded manner, and the lower part of the valve core shell (32) is provided with an internal thread which is fixed with a corresponding external thread of the valve core base (33) in a threaded manner.

7. The anti-scale thermostatic cartridge of claim 6, wherein: at least one fourth sealing ring (44) is arranged at the fixed connection position between the valve core shell (32) and the valve core upper seat (31), and at least one sealing element (28) is arranged at the fixed connection position between the valve core shell (32) and the valve core base (33).

8. The anti-scale thermostatic cartridge of claim 7, wherein: the sealing element (28) is a sealing gasket which can seal a fixed connection part between the valve core shell (32) and the valve core base and the upper end surface of the sealing gasket can abut against the movable sleeve (27).

9. A scale-resistant thermostatic cartridge as claimed in any one of claims 1 to 8 wherein: the movable sleeve (27) comprises an outer cylinder (271) and an inner cylinder (272), the outer cylinder (271) and the inner cylinder (272) are connected through a plurality of ribs (273), and the lower edge of the inner cylinder (271) is higher than that of the outer cylinder (272).

10. The anti-scale thermostatic cartridge of claim 9, wherein: the outer wall (323) of the valve core shell (32) is provided with a cold water inlet C and a hot water inlet H which are used for cold water and hot water to flow in respectively, the valve core shell (32) extends inwards to be provided with a bearing part (321), the bearing part (321) comprises a cylinder (3211), and the cylinder (3211) is tightly abutted against the inner cylinder (272) of the movable sleeve (27).

11. The anti-scale thermostatic cartridge of claim 9, wherein: the bottom of the connecting cylinder (23) extends outwards to form a circle of convex edge (231) so as to enable the movable sleeve (27) to be pushed upwards, an external thread is processed on the upper portion of the connecting cylinder (23) and is matched and screwed with an internal thread of the spring fixing seat (24), an internal thread is arranged inside the connecting cylinder (23) and is matched and screwed with a thread on the periphery of the thermosensitive element (22), and therefore the thermosensitive element (22), the connecting cylinder (32) and the spring fixing seat (24) are fixed mutually.

12. The anti-scale thermostatic cartridge of claim 9, wherein: the lower end face of the spring fixing seat (24) extends downwards to form an extending cylinder (241), the lower end face of the spring fixing seat (24) is divided into two parts by the extending cylinder (241), wherein the inner lower end face (242) positioned at the inner ring abuts against one end of the overload spring (26), and the outer lower end face (243) positioned at the outer ring abuts against one end of the reset spring (25).

13. A scale resistant thermostatic cartridge as claimed in any one of claims 1 to 8 and 9 to 10 wherein: the temperature adjusting assembly (1) mainly comprises a clamping ring (11), an adjusting Wen Sigan (12) and an actuating part (13), wherein an external thread is processed on the lower portion of the temperature adjusting screw rod (12) and is matched with the internal thread on the upper portion of the actuating part (13) to form a liftable screw rod transmission structure, a clamping edge (121) is arranged in the middle of the temperature adjusting screw rod (12), the upper portion of the temperature adjusting screw rod (12) extends out of an inner cavity of the valve core upper seat (31) until the clamping edge (121) is clamped with the valve core upper seat (31), the clamping ring (11) is installed on the upper portion of the temperature adjusting screw rod (12), and finally under the combined action of the clamping edge (121) and the clamping ring (11), the temperature adjusting screw rod (12) can be rotatably fixed on the valve core upper seat (31).

14. The anti-fouling thermostatic cartridge of claim 13, wherein: the pushing piece (13) is a sliding sleeve, the upper part of the sliding sleeve is provided with internal threads which are in transmission fit with the external threads of the temperature adjusting screw rod (12), the periphery of the upper part of the sliding sleeve is provided with a plurality of anti-rotation columns (131) which are clamped with a plurality of clamping grooves (311) arranged in the valve core upper seat (31) to prevent the sliding sleeve from rotating, the lower part of the sliding sleeve is provided with a connecting rod 132 which penetrates through the inner cavity of the connecting cylinder (23), and the bottom end face of the connecting rod 132 is abutted against the upper end face of the thermosensitive element (22).

15. A scale resistant thermostatic cartridge according to any one of claims 1-8, 10-12, 12-14 wherein: at least one first sealing ring (41) is arranged at the fixed connection position between the thermosensitive element (22) and the connecting cylinder (23), at least one second sealing ring (42) is arranged at the abutting position between the connecting cylinder (23) and the movable sleeve (27), and at least one third sealing ring (43) is arranged at the tight abutting position between the inner cylinder (272) of the movable sleeve (27) and the cylinder (322) of the valve core shell (32).