Constant water pressure mechanical device and water heater

Abstract

The utility model discloses a constant water pressure mechanical device and a water heater. The constant water pressure mechanical device comprises a shell, and a water inlet and a water outlet are formed in the two ends of the shell respectively. The balloon is arranged in the shell and located between the water inlet and the water outlet, and a water flow channel is formed between the outer wall of the balloon and the inner wall of the shell; the tensile elastic telescopic piece is arranged in the shell and comprises a guide rod part and a movable rod part, the guide rod part is connected with one end of the balloon and fixed in the shell, the movable rod part is connected with the other end of the balloon, and the movable rod part can telescopically move in the axis direction of the shell relative to the guide rod part; the flow blocking structure is fixed to the movable rod part, and the flow blocking structure drives the movable rod part to move in the direction away from the guide rod part under the impact effect of water flow so as to drive the balloon to be lengthened and deformed. According to the invention, adaptive pressure regulation can be carried out according to the condition of inlet water flow, the outlet water pressure is ensured and stabilized, the water use experience of a user is improved, the regulation is simpler, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a constant water pressure mechanical device and a water heater. Background Art

[0002] More and more citizens are choosing to live in commercial housing estates, and the number of floors and households in newly developed buildings is increasing. However, some problems have arisen, such as reduced water flow during peak water use periods in some residential areas and occasional insufficient water pressure on high floors.

[0003] When purchasing a gas water heater, some users do not fully consider the water pressure in the community, and the gas water heater they purchase does not have a water pump component, which results in either excessive water pressure, causing discomfort when the water impacts the skin, or too little water pressure, making it impossible to use the water heater properly. Although some users consider the water pressure issue, the gas water heater with a water pump component is too expensive, so they can only choose a gas water heater without a water pump component.

[0004] After purchasing a gas water heater without a water pump assembly, in order to solve the problem of insufficient water pressure, the pressure-boosting shower and water outlet joint are obtained by gradually reducing the cross-sectional area of ​​the water flow. The disadvantage of this method is that it cannot adjust the pressure adaptively according to the size of the water flow in the water inlet pipe, and can only be in a pressurized state. This results in water rushing to the skin when the water flow is large, causing discomfort and poor user experience.

[0005] In view of the above-mentioned shortcomings, it is necessary to design a constant water pressure mechanical device and a water heater. Utility Model Content

[0006] Therefore, the technical problem to be solved by the present invention is that it is impossible to perform adaptive pressure adjustment according to the size of the water flow in the water inlet pipe, thereby providing a constant water pressure mechanical device and a water heater.

[0007] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0008] A constant water pressure mechanical device, comprising:

[0009] A shell body, wherein a containing cavity is provided therein, and a water inlet and a water outlet are respectively provided at two ends of the shell body, and the water inlet and the water outlet are respectively connected to the containing cavity;

[0010] An elastically deformable balloon is disposed in the shell and between the water inlet and the water outlet, and a water flow channel is formed between the outer wall of the balloon and the inner wall of the shell;

[0011] A stretchable elastic telescopic member is arranged in the shell, and comprises a guide rod portion and a movable rod portion, wherein the guide rod portion is connected to one end of the balloon and fixed to the shell, and the movable rod portion is connected to the other end of the balloon, and the movable rod portion can be telescopically moved relative to the guide rod portion along the axial direction of the shell;

[0012] The flow blocking structure is fixed on the movable rod and is located downstream of the balloon. Under the impact of water flow, the flow blocking structure drives the movable rod to move in a direction away from the guide rod, so as to drive the balloon to stretch and deform.

[0013] Since the balloon is elastically deformable, the guide rod is connected to one end of the balloon and fixed in the shell, and the movable rod is connected to the other end of the balloon, the movable rod can be telescopically moved relative to the guide rod along the axial direction of the shell, and the flow blocking structure is located downstream of the balloon and fixed on the movable rod. Therefore, when the impact force of the water flow on the flow blocking structure becomes greater, the flow blocking structure will move downstream, causing the movable rod to move downstream as a whole, thereby pulling the matching balloon to stretch and deform downstream, causing the size of the balloon in the radial direction of the shell to become smaller. Correspondingly, the size of the water flow channel in the radial direction of the shell becomes larger, thereby reducing the water pressure of the water outlet pipe, thereby preventing the water flow from rushing towards the human body and causing discomfort. Specifically, the greater the impact force of the water flow on the flow blocking structure, the greater the flow blocking structure moves downward through the movable rod. The greater the distance the balloon is pulled, the greater the degree of elongation and deformation of the balloon; when the impact force of the water flow on the flow-blocking structure becomes smaller, the flow-blocking structure will move toward the water inlet, the pulling force of the movable rod on the balloon becomes smaller, and the balloon shrinks toward the water inlet, so that the size of the balloon in the radial direction of the shell becomes larger. Correspondingly, the size of the water flow channel in the radial direction of the shell becomes smaller, thereby increasing the water pressure of the water outlet pipe to ensure normal water outlet. Specifically, the more the impact force of the water flow on the flow-blocking structure is reduced, the greater the amplitude of the balloon shrinking toward the water inlet. Therefore, the constant water pressure mechanical device in the utility model can adjust the pressure through the adaptive deformation of the balloon according to the water inlet flow conditions, which can not only ensure the water outlet pressure, but also stabilize the water outlet pressure, thereby improving the user's water experience.

[0014] In one of the embodiments, the stretching elastic telescopic part also includes a stretching spring, the bottom end surface of the guide rod portion is recessed inward to form a first guide hole, the first end of the movable rod portion is telescopically installed in the first guide hole along the axial direction of the shell, and the second end is connected to the flow blocking structure, and the stretching spring is used to pull the movable rod portion to move toward the guide rod portion.

[0015] In one embodiment, the tension spring is installed in the first guide hole, one end of the tension spring is fixedly connected to the guide rod portion, and the other end of the tension spring is fixedly connected to the first end of the movable rod portion.

[0016] In one of the embodiments, it also includes a hanging ear, which is arranged at the first end of the movable rod portion, and the guide rod portion is provided with a slide groove extending along the axial direction of the shell, the slide groove is connected to the first guide hole inwardly, and passes through the outer wall of the guide rod portion outwardly, and the balloon is provided with a first through hole, and the hanging ear passes through the first through hole and is hung on the inner wall of the balloon, and the hanging ear can slide along the slide groove.

[0017] In one embodiment, a support member is further included, wherein the support member is connected to the inner wall of the shell, and the guide rod portion is fixed in the shell through the support member.

[0018] In one embodiment, the support member includes a first support member adjacent to the water inlet and a second support member adjacent to the water outlet, the first support member is used to fix the guide rod portion, and the second support member is used to assist in limiting the movable rod portion, a step surface and a bearing surface are provided in the shell, the second support member abuts and cooperates with the bearing surface, and an elastic sheet is provided on the first support member, and the elastic sheet abuts and cooperates with the step surface to limit the first support member from moving along the axial direction of the shell toward the water inlet.

[0019] In one embodiment, a second guide hole extending along the axial direction of the shell is formed on the second support member, and the second end of the movable rod is telescoped toward the water outlet and passes through the second guide hole to be connected to the flow blocking structure.

[0020] In one embodiment, the movable rod and the hanging ear are formed independently; or,

[0021] The movable rod portion and the hanging ear are integrally formed, the sliding groove passes through the bottom end surface of the guide rod portion, and the second supporting member is detachably connected to the guide rod portion.

[0022] In one embodiment, the shell further includes a water inlet pipe, an enlarged portion, and a water outlet pipe connected in sequence, the opening of the water inlet pipe forms the water inlet, the opening of the water outlet pipe forms the water outlet, the diameter of the enlarged portion is larger than the diameter of the water inlet and the water outlet, respectively, and the balloon is located in the enlarged portion.

[0023] A water heater comprises the above-mentioned constant water pressure mechanical device; the constant water pressure mechanical device is installed on the water outlet pipe of the water heater so that the water inlet pipe of the shell is close to the water heater.

[0024] The utility model water heater has the advantages of the above-mentioned constant water pressure mechanical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a three-dimensional schematic diagram of the constant water pressure mechanical device in Embodiment 1 of the present utility model;

[0027] Figure 2 It is a three-dimensional schematic diagram of the constant water pressure mechanical device in Embodiment 1 of the utility model after removing the shell from the first angle;

[0028] Figure 3 It is a three-dimensional schematic diagram of the constant water pressure mechanical device in Embodiment 1 of the utility model after removing the shell from the second angle;

[0029] Figure 4 It is a cross-sectional schematic diagram of a first angle of the constant water pressure mechanical assembly in Embodiment 1 of the utility model;

[0030] Figure 5 It is a cross-sectional schematic diagram of a second angle after the housing of the constant water pressure mechanical component in Embodiment 1 of the utility model is removed;

[0031] Figure 6 It is a three-dimensional combined schematic diagram of the movable rod, the tension spring and the flow-blocking structure in Embodiment 1 of the present utility model;

[0032] Figure 7 It is a three-dimensional schematic diagram of the support member in Embodiment 1 of the utility model;

[0033] Figure 8 It is a partial three-dimensional combined schematic diagram of the flow blocking structure, the second support member, the movable rod portion, the tension spring and the guide rod portion in Example 1 of the utility model;

[0034] Fig. 9 This is a schematic diagram of the deformation of the balloon in the shell when there is a small water flow in Example 1 of the utility model;

[0035] Fig.10 This is a schematic diagram of the deformation of the balloon in the shell when there is a large water flow in Example 1 of the utility model;

[0036] Fig.11 It is a three-dimensional schematic diagram of a water heater equipped with a constant water pressure mechanical device in Example 2 of the utility model.

[0037] Description of reference numerals:

[0038] A. Constant water pressure mechanical device; A0. Accommodating chamber; B. Water flow channel; C. Water inlet; D. Water outlet; 1. Shell; 11. Water inlet pipe; 111. Step surface; 12. Water outlet pipe; 121. Bearing surface; 13. Expansion portion; 2. Balloon; 20. First through hole; 3. Tensile elastic telescopic member; 30. Guide rod; 300. First guide hole; 301. Slide groove; 31. Movable rod; 32. Tensile spring; 4. Flow blocking structure; 5. Hanging ear; 6. Support member; 61. Connecting ring; 611. Elastic sheet; 62. Disc; 620. Second guide hole; 63. Spoke; 7. Water heater; 72. Water outlet pipe. DETAILED DESCRIPTION

[0039] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] like Figures 1 to 10As shown, this embodiment provides a constant water pressure mechanical device A, including a housing 1, an elastically deformable balloon 2, a stretchable elastic telescopic member 3, and a flow blocking structure 4. In this embodiment, the constant water pressure mechanical device A can be used to adjust the outlet water pressure of a water heater, and in other embodiments, the constant water pressure mechanical device A is used to adjust the outlet water pressure of other water-using equipment.

[0045] The housing 1 is provided with a receiving cavity A0 (such as Figure 4 The housing 1 includes a water inlet pipe 11, an expansion portion 13 and a water outlet pipe 12, all of which are cylindrical and connected in sequence. The opening of the water inlet pipe 11 forms a water inlet C (as shown in FIG. Figure 4 The opening of the water outlet pipe 12 forms a water outlet D (as shown). Figure 4 As shown). The water inlet C and the water outlet D are both connected to the accommodating chamber A0. The inner wall of the water inlet pipe 11 is provided with an internal thread to match the external thread on the outer wall of the water outlet of the water heater and other water-using equipment. The outer wall of the water outlet pipe 12 is provided with an external thread to match the internal thread on the external outlet pipe of the water-using equipment. The water inlet pipe 11 is provided with a step surface 111 at the bottom (as shown). Figure 4 As shown), the outlet pipe 12 is provided with a bearing surface 121 at the top (as shown Figure 4 The diameter of the expanded portion 13 is larger than the diameter of the water inlet pipe 11 and the water outlet pipe 12.

[0046] The balloon 2 is located in the expanded portion 13. A water flow channel B (such as Fig. 9 and Fig.10 As shown in Figure 4 , Fig. 9 as well as Fig.10 As shown, the top end of the balloon 2 faces the water inlet C, and the bottom end faces the water outlet D. A first through hole 20 is formed at the bottom end of the balloon 2 .

[0047] In one embodiment, the stretchable elastic member 3 is disposed in the housing 1. Figure 4 As shown, the stretching elastic telescopic member 3 includes a guide rod portion 30 and a movable rod portion 31. The movable rod portion can be telescopically moved relative to the guide rod portion along the axial direction of the shell. The guide rod portion 30 is fixed in the shell 1 and connected to one end of the balloon 2. The movable rod portion is connected to the other end of the balloon. A flow blocking structure 4 and two oppositely arranged ears 5. A groove is provided at the top of the guide rod portion 30, and a second through hole (not shown) is opened at the top of the balloon 2. The balloon 2 is sleeved on the outside of the guide rod portion 30, and the second through hole is sleeved in the groove. In order to ensure the reliability of the connection between the balloon 2 and the guide rod portion 30, the balloon and the guide rod portion 30 are fixed with screws or clamps.

[0048] The flow blocking structure 4 is fixed to the bottom end of the movable rod 31 and is located downstream of the balloon 2. Under the impact of the water flow, the flow blocking structure 4 drives the movable rod 31 to move away from the guide rod 30, so as to drive the balloon 2 to stretch and deform.

[0049] Specifically, the balloon 2 can be made of common soft elastic materials such as rubber, silicone, etc., such as TPR, etc., to achieve flexible elongation and deformation.

[0050] In one embodiment, the baffle structure 4 is detachably connected to the guide rod portion 30 .

[0051] In one embodiment, the baffle structure 4 and the guide rod portion 30 are formed integrally.

[0052] In one embodiment, if Figure 4 and Figure 5 As shown, the stretching elastic expansion member 3 also includes a stretching spring 32. The bottom end surface of the guide rod portion 30 is inwardly recessed to form a first guide hole 300 (such as Figure 5 As shown in FIG. 1 , the first end of the movable rod 31 is telescopically installed in the first guide hole 300 along the axial direction of the housing 1, and the second end is connected to the baffle structure 4. The tension spring 32 is used to pull the movable rod 31 to move toward the guide rod 30.

[0053] In one embodiment, the tension spring 32 is installed in the first guide hole 300 , one end of the tension spring 32 is fixedly connected to the guide rod portion 30 , and the other end of the tension spring 32 is fixedly connected to the first end of the movable rod portion 31 .

[0054] In one embodiment, it also includes a hook 5, which is arranged at the first end of the movable rod portion 31. A slide groove 301 extending along the axial direction of the shell 1 is provided on the guide rod portion 30. The slide groove 301 is connected to the first guide hole 300 inwardly and passes through the outer wall of the guide rod portion 30 outward. A first through hole 20 is provided on the balloon 2. The hook 5 passes through the first through hole 20 and is hung on the inner wall of the balloon 2. The hook 5 can slide along the slide groove 301.

[0055] In one embodiment, if Figure 2 , Figure 4 , Figure 5 and Figure 7 As shown, it also includes a support member 6, which is connected to the inner wall of the housing 1, and the guide rod portion 30 It is fixed in the housing 1 by the support member 6. The support member 6 includes a connecting ring 61, a disc body 62 and spokes 63. The two ends of the spokes 63 are connected to the connecting ring 61 and the disc body 62 respectively.

[0056] In one embodiment, if Figure 2 , Figure 4 , Figure 5 and Figure 7As shown, the support member 6 includes a first support member 6a adjacent to the water inlet C and a second support member 6b adjacent to the water outlet D. The first support member 6a is used to fix the guide rod portion 30, and the second support member 6b is used to assist in limiting the movable rod portion 31. A step surface 111 and a bearing surface 121 are provided in the shell 1, and the second support member 6b abuts against the bearing surface 121. An elastic sheet 611 is provided on the first support member 6a, and the elastic sheet 611 abuts against the step surface 111 to limit the first support member 6a from moving along the axial direction of the shell 1 toward the water inlet C and exiting the shell 1.

[0057] In one embodiment, the second support member 6b is provided with a second guide hole 620 (eg, Figure 8 As shown in FIG. 1 , the second end of the movable rod 31 is extended toward the water outlet D and passes through the second guide hole 620 to be connected to the flow blocking structure 4.

[0058] In one embodiment, the movable rod 31 and the hanging ear 5 are formed separately and independently. In this case, the slide groove 301 may not pass through the bottom end surface of the guide rod 30. After the movable rod 31 is inserted into the guide rod 30, the hanging ear 5 is installed on the movable rod 31.

[0059] In one embodiment, the movable rod 31 is integrally formed with the ear 5. In this case, the slide groove 301 is required to pass through the bottom end surface of the guide rod 30 to facilitate the ear 5 to slide from the bottom end of the guide rod 30 into the slide groove 301. The second support member 6b is detachably connected to the guide rod 30 so that the balloon 2 is sleeved outside the guide rod 30.

[0060] In one embodiment, the shell 1 also includes a water inlet pipe 11, an enlarged portion 13, and a water outlet pipe 12 connected in sequence, the opening of the water inlet pipe 11 forms a water inlet C, the opening of the water outlet pipe 12 forms a water outlet D, the diameter of the enlarged portion 13 is larger than the diameters of the water inlet pipe 11 and the water outlet pipe 12, and the balloon 2 is located in the enlarged portion 13.

[0061] In one embodiment, the stretching elastic telescopic member 3 is adaptively improved from a common gas spring telescopic rod. The gas spring telescopic rod is formed by two rod members inserted and matched to form a telescopic rod. Since the interior is sealed, when the movable end is subjected to tension, the air pressure in the telescopic rod cavity decreases. When the tension is reduced or removed, the movable end will be compressed and reset by the external water pressure or air pressure. Therefore, when applied to the present application, the movable end can also move with the flow blocking structure and automatically reset.

[0062] The pressure regulating process of the constant water pressure mechanical device A in the utility model is introduced below:

[0063] When the water flow from the water inlet pipe 11 flows along the water flow channel B toward the water outlet pipe 12, it impacts the flow blocking structure 4 and squeezes the balloon 2 along the radial direction of the shell 1;

[0064] like Fig. 9 As shown, when the water flow of the incoming water increases, the impact force of the incoming water on the flow blocking structure 4 gradually increases and reaches the preset impact force value, the flow blocking structure 4 starts to move toward the water outlet D, and drives the hanging ear 5 to move toward the water outlet D through the movable rod 31. Since the hanging ear 5 is hung with the inner wall of the balloon 2, the balloon 2 is stretched and deformed toward the water outlet D, and the size of the balloon 2 along the radial direction of the shell 1 becomes smaller. Correspondingly, the size of the water flow channel B along the radial direction of the shell 1 becomes larger, so that the water pressure of the water outlet pipe 12 becomes smaller, avoiding the tingling sensation caused by excessive water pressure and impact on the body, thereby improving the user experience;

[0065] like Fig.10 As shown, when the incoming water flow becomes smaller, the impact force of the water flow on the flow-blocking structure 4 becomes smaller, and the balloon 2 begins to shrink and deform toward the water inlet C (the smaller the incoming water flow, the greater the degree of shrinkage and deformation), and the size of the balloon 2 along the radial direction of the shell 1 becomes larger. Correspondingly, the size of the water flow channel B along the radial direction of the shell 1 becomes smaller, and the outlet water pressure of the outlet pipe 12 increases to ensure the outlet water pressure.

[0066] In summary, the constant water pressure mechanical device A provided in the present invention can adaptively change the cross-sectional area of ​​the water flow channel B according to the size of the water inlet flow rate, thereby adjusting the water outlet pressure.

[0067] In addition, since the movable rod 31 can move along the axial direction of the shell 1 as the water flow changes and drive the balloon 2 to stretch and deform along the axial direction of the shell 1, the accumulation of scale can be effectively prevented.

[0068] Furthermore, due to the setting of the flow-blocking structure 4, while the balloon 2 is squeezed radially inward by the water flow, when the water flow is large, the hanging ear 5 connected to the movable rod 31 can pull the balloon 2 toward the water outlet D, thereby accelerating the reduction of the radial size of the balloon 2 in the shell 1; and due to the setting of the tension spring 32, when the water flow decreases, the tension spring 32 can pull the movable rod 31 toward the water inlet C, thereby reducing the resistance of the movable rod 31 and the flow-blocking structure 4 to the retraction of the balloon 2 toward the water inlet C due to their own gravity, ultimately making the water pressure regulation response speed of the constant water pressure mechanical device A in the utility model faster.

[0069] Finally, additional explanation:

[0070] 1. The constant water pressure mechanical device A can be made of plastic and synthetic rubber as a whole, so the cost is low, and the various components only need to be connected to each other by snap-fit ​​or plug-in fixing, which is convenient for processing;

[0071] 2. The constant water pressure mechanical device A can be sold at a low price in the form of an accessory package with the water heater to enhance the competitiveness of low-end water heaters;

[0072] 3. The balloon 2 in the constant water pressure mechanical device A adjusts the outlet water pressure only by deforming in accordance with the water flow. There are no electrical components, so it is simple and easy to understand, easy to maintain and has low installation cost.

[0073] Example 2

[0074] like Figure 4 He Ru Fig.11 As shown, this embodiment provides a water heater 7, comprising the constant water pressure mechanical device A in embodiment 1. The constant water pressure mechanical device A is installed on the water outlet pipe 72 of the water heater 7, so that the water inlet pipe 11 is close to the water heater 7.

[0075] The constant water pressure mechanical device A can stabilize the outlet water pressure of the water heater 7. In this way, even if the user chooses a water heater without a water pump component, when the water flow of residents is reduced during the peak water use period in the community and there are occasional water pressure fluctuations on high floors, the water outlet pressure at the user terminal can be effectively improved without changing the water flow, thereby enhancing the user experience. In addition, the constant water pressure mechanical device A only needs to be installed on the outlet pipe of the water heater 7, and the user can adjust the water pressure without changing the decoration of his or her own home.

[0076] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A constant water pressure mechanical device, characterized in that: include: A shell (1) is provided with a receiving cavity (A0) therein, and a water inlet (C) and a water outlet (D) are respectively provided at two ends of the shell (1), and the water inlet (C) and the water outlet (D) are respectively connected to the receiving cavity (A0); An elastically deformable balloon (2) is disposed in the shell (1) and between the water inlet (C) and the water outlet (D), and a water flow channel (B) is formed between the outer wall of the balloon (2) and the inner wall of the shell (1); A stretchable elastic member (3) is arranged in the housing (1), and comprises a guide rod (30) and a movable rod (31). The guide rod (30) is connected to one end of the balloon (2) and is fixed in the housing (1), and the movable rod (31) is connected to the other end of the balloon (2). The movable rod (31) can be telescopically moved relative to the guide rod (30) along the axial direction of the housing (1); The flow blocking structure (4) is fixed on the movable rod portion (31) and is located downstream of the balloon (2). Under the impact of the water flow, the flow blocking structure (4) drives the movable rod portion (31) to move in a direction away from the guide rod portion (30), thereby driving the balloon (2) to stretch and deform.

2. The constant water pressure mechanical device according to claim 1, characterized in that: The stretching elastic telescopic member (3) also includes a stretching spring (32); the bottom end surface of the guide rod portion (30) is inwardly recessed to form a first guide hole (300); the first end of the movable rod portion (31) is telescopically installed in the first guide hole (300) along the axial direction of the shell (1); the second end is connected to the flow blocking structure (4); the stretching spring (32) is used to pull the movable rod portion (31) to move toward the inside of the guide rod portion (30).

3. The constant water pressure mechanical device according to claim 2, characterized in that: The tension spring (32) is installed in the first guide hole (300), one end of the tension spring (32) is fixedly connected to the guide rod portion (30), and the other end is fixedly connected to the first end of the movable rod portion (31).

4. The constant water pressure mechanical device according to claim 3, characterized in that: It also includes a hanging ear (5), which is arranged at the first end of the movable rod portion (31); the guide rod portion (30) is provided with a slide groove (301) extending along the axial direction of the shell (1); the slide groove (301) is connected to the first guide hole (300) inwardly and passes through the outer wall of the guide rod portion (30) outwardly; the balloon (2) is provided with a first through hole (20), the hanging ear (5) passes through the first through hole (20) and is hung on the inner wall of the balloon (2); the hanging ear (5) can slide along the slide groove (301).

5. The constant water pressure mechanical device according to claim 4, characterized in that: It also comprises a support member (6), wherein the support member (6) is connected to the inner wall of the shell (1), and the guide rod portion (30) is fixed in the shell (1) via the support member (6).

6. The constant water pressure mechanical device according to claim 5, characterized in that: The support member (6) comprises a first support member (6a) adjacent to the water inlet (C) and a second support member (6b) adjacent to the water outlet (D); the first support member (6a) is used to fix the guide rod portion (30); the second support member (6b) is used to assist in limiting the position of the movable rod portion (31); a step surface (111) and a bearing surface (121) are provided in the shell (1); the second support member (6b) is in abutment with the bearing surface (121); an elastic sheet (611) is provided on the first support member (6a); the elastic sheet (611) is in abutment with the step surface (111) to limit the first support member (6a) from moving along the axial direction of the shell (1) toward the water inlet (C).

7. The constant water pressure mechanical device according to claim 6, characterized in that: The second support member (6b) is provided with a second guide hole (620) extending along the axial direction of the shell (1), and the second end of the movable rod (31) is telescoped toward the water outlet (D) and passes through the second guide hole (4120) to connect with the flow blocking structure (4).

8. The constant water pressure mechanical device according to claim 6, characterized in that: The movable rod portion (31) and the hanging ear (5) are formed independently; or, The movable rod portion (31) and the hanging ear (5) are integrally formed, the sliding groove (301) passes through the bottom end surface of the guide rod portion (30), and the second support member (6b) is detachably connected to the guide rod portion (30).

9. The constant water pressure mechanical device according to any one of claims 1 to 8, characterized in that: The shell (1) further comprises a water inlet pipe (11), an enlarged portion (13), and a water outlet pipe (12) connected in sequence, the opening of the water inlet pipe (11) forming the water inlet (C), the opening of the water outlet pipe (12) forming the water outlet (D), the diameter of the enlarged portion (13) being larger than the diameters of the water inlet pipe (11) and the water outlet pipe (12), respectively, and the balloon (2) being located in the enlarged portion (13).

10. A water heater, characterized in that: It comprises the constant water pressure mechanical device according to any one of claims 1 to 9; the constant water pressure mechanical device (A) is installed on the water outlet pipe (72) of the water heater (7) so that the water inlet (C) of the shell (1) is close to the water heater (7).

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