A wastewater treatment device for a thermal power plant

Abstract

The invention discloses a wastewater treatment device for a thermal power plant, which relates to the technical field of thermal power plants and comprises a mixing unit, wherein the mixing unit comprises a mixing tank body assembly and a mounting cover mounted on the mixing tank body assembly, wherein the mixing tank body assembly and the mounting cover are connected to the mounting assembly; a feeding unit, wherein the feeding unit comprises a liquid storage assembly and a piston assembly connected to the liquid storage assembly, wherein one side of the piston assembly is connected to a high-pressure pump, and the other side of the high-pressure pump is connected to a driving water tank; a liquid outlet unit, wherein the liquid outlet unit comprises a liquid outlet and a laser beam sensor connected to the inside of the liquid outlet, wherein one end of the liquid outlet is connected to a waste valve; and a stirring unit, wherein the stirring unit comprises a stirring assembly and a connecting assembly connected to the stirring assembly. The device solves the problem that insufficient stirring of wastewater and flocculant results in poor wastewater treatment effect, and at the same time, sediment after flocculation and precipitation adheres to the stirring structure, making it inconvenient to discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power plants, in particular to a wastewater treatment device for thermal power plants. Background Art

[0002] With the increase in global energy demand, thermal power plants have become one of the main energy supply methods in many countries. However, the wastewater generated during thermal power generation has a serious impact on the environment and human health. Therefore, thermal power plant wastewater treatment technology has become the key to solving this problem. By adding precipitants and flocculants to the wastewater, the wastewater is separated and precipitated, and the sediment and wastewater are treated in batches respectively. Currently, precipitants and flocculants are added to the wastewater at one time. During the operation, it was found that a large amount of precipitants and flocculants often settle to the bottom of the collection box without being completely dissolved, resulting in sediment coverage and wasting precious resources. At the same time, this also means that the wastewater fails to fully react, thereby significantly reducing the effect of wastewater treatment. Summary of the Invention

[0003] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the invention.

[0004] In view of the problem that the above-mentioned prior art does not sufficiently stir the wastewater and the flocculant, resulting in poor wastewater treatment effect, and the sediment after flocculation and precipitation will adhere to the stirring structure, making it difficult to discharge, the present invention is proposed.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A wastewater treatment device for a thermal power plant, comprising a mixing unit, wherein the mixing unit comprises a mixing tank assembly and a mounting cover mounted on the mixing tank assembly, wherein the mixing tank assembly and the mounting cover are connected to a mounting assembly;

[0006] A feeding unit, comprising a liquid storage assembly and a piston assembly connected to the liquid storage assembly, one side of the piston assembly being connected to a high-pressure pump, and the other side of the high-pressure pump being connected to a driving water tank;

[0007] A liquid outlet unit, comprising a liquid outlet and a laser beam sensor connected to the inside of the liquid outlet, one end of the liquid outlet being connected to a waste valve;

[0008] The stirring unit includes a stirring component and a communication component connected to the stirring component.

[0009] As a preferred embodiment of the thermal power plant wastewater treatment device of the present invention, the mixing tank assembly includes a tank body and a guide rail connected to the inside of the tank body, and the guide rail is centrally symmetrically arranged inside the tank body;

[0010] The mounting assembly includes a first fixing block and a second fixing block arranged at the lower side of the first fixing block, and the interior of the first fixing block is connected with a mounting bolt.

[0011] As a preferred solution of the thermal power plant wastewater treatment device of the present invention, the liquid storage component includes a flocculant tank and a feeding pipe connected to the inside of the flocculant tank, and an upper one-way valve is installed on the feeding pipe.

[0012] As a preferred solution of the wastewater treatment device for a thermal power plant of the present invention, the piston assembly includes a piston cylinder and a buffer airbag connected to the piston cylinder.

[0013] As a preferred solution of the thermal power plant wastewater treatment device of the present invention, the stirring assembly includes a stirring plate and an adjusting member connected to the lower side of the stirring plate, and a locking member is provided inside the stirring plate.

[0014] As a preferred solution of the thermal power plant wastewater treatment device described in the present invention, the stirring plate member includes a stirring plate body and a guide port opened on the outside of the stirring plate body, an inner flow channel is opened inside the stirring plate body, and through ports are opened on both sides of the inner flow channel, and a connecting hole is provided inside the stirring plate body.

[0015] As a preferred solution of the thermal power plant wastewater treatment device of the present invention, the regulating member includes a rotating plate and a rotating connecting ring connected to the rotating plate, and an arc block is connected to the outside of the rotating connecting ring.

[0016] As a preferred solution of the thermal power plant wastewater treatment device described in the present invention, the locking part includes a locking rod and a connecting vertical rod connected to one side of the locking rod, and one side of the connecting vertical rod is connected to a matching block, and one end of the locking rod is connected to a reset spring.

[0017] As a preferred solution of the wastewater treatment device for a thermal power plant of the present invention, one end of the engaging rod is provided with an inclined sliding surface, and the matching block and the arc block are arranged in mutual matching contact.

[0018] As a preferred solution of the thermal power plant wastewater treatment device described in the present invention, the connecting rod member includes a connecting rod body and a snap-fit ​​hole provided on the connecting rod body, a connecting flow channel is provided inside the connecting rod body, and a liquid outlet is provided outside the connecting flow channel.

[0019] The beneficial effects of the present invention are as follows: wastewater is transported to the interior of the tank body through the liquid inlet pipe arranged on the mounting cover, and then the connecting component is moved downward by the cooperation between the high-pressure pump and the driving water tank, thereby forming a negative pressure inside the piston cylinder, sucking the flocculant inside the flocculant box into the piston cylinder, and then transported to the interior of the stirring plate through the connecting component, and then mixed with the wastewater through the arrangement of the internal flow channel and the through port, and at the same time, through the cooperation between the stirring plate and the guide rail, the stirring plate body is rotated to stir the wastewater, so that the wastewater and the flocculant are fully mixed, and at the same time the high-pressure pump circulates and operates repeatedly for several times until the flocculant reaches the specified addition amount and stops, thereby ensuring the full mixing between the flocculant and the wastewater and improving the treatment effect of the wastewater. At the same time, after the mixing is completed, the stirring unit is stopped on the upper side of the mixing tank body component, so that there will not be too many mechanical structures in the wastewater, thereby solving the problem that condensate is easily attached to the internal mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0023] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle.

[0024] Figure 4 for Figure 2 Enlarged structural diagram at point B in the middle.

[0025] Figure 5 It is a structural schematic diagram of the mixing tank assembly of the present invention.

[0026] Figure 6 This is a schematic diagram of the connection structure between the adjusting member and the engaging member of the present invention.

[0027] Figure 7 It is a schematic diagram of the cross-sectional structure of the stirring plate of the present invention.

[0028] Figure 8 It is a schematic diagram of the partial cross-sectional structure of the connecting component of the present invention.

[0029] Figure 9 for Figure 8 Enlarged structural diagram at point C in the middle. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0033] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0034] Example 1

[0035] Reference Figures 1 and 2 , which is a first embodiment of the present invention, provides a wastewater treatment device for a thermal power plant, including a mixing unit 100, the mixing unit 100 including a mixing tank assembly 101 and a mounting cover 102 mounted on the mixing tank assembly 101, and a mounting assembly 103 connected to the mixing tank assembly 101 and the mounting cover 102;

[0036] Support legs are installed at the bottom of the mixing tank assembly 101, and a controller is installed on the support legs to control the operation of the high-pressure pump 203 to ensure the normal operation of the device. At the same time, the mixing tank assembly 101 and the mounting cover 102 are sleeved together, and the mounting assembly 103 is used to fix the mixing tank assembly 101 and the mounting cover 102. The mixing tank assembly 101 and the mounting cover 102 can be installed and separated, so that the interior of the mixing tank assembly 101 can be inspected and cleaned when necessary.

[0037] A liquid inlet pipe is also provided at the upper end of the mounting cover 102, through which wastewater can be added to the interior of the mixing tank assembly 101. There is no need to disassemble the mixing tank assembly 101 and the mounting cover 102 when adding wastewater, thereby reducing the intensity of work and improving efficiency.

[0038] The feeding unit 200 includes a liquid storage assembly 201 and a piston assembly 202 connected to the liquid storage assembly 201. One side of the piston assembly 202 is connected to a high-pressure pump 203, and the other side of the high-pressure pump 203 is connected to a driving water tank 204. The liquid storage assembly 201 includes a flocculant tank 201a and a feeding pipe 201b connected to the inside of the flocculant tank 201a. The feeding pipe 201b is installed with an upper one-way valve 201c. The piston assembly 202 includes a piston cylinder 202a and a buffer air bag 202b connected to the piston cylinder 202a.

[0039] The flocculant box 201a is used to store the flocculant, and the feeding pipe 201b is used to connect the flocculant box 201a and the piston cylinder 202a together, and the upper one-way valve 201c is installed on the feeding pipe 201b. The upper one-way valve 201c can prevent the liquid inside the piston cylinder 202a from flowing back into the flocculant box 201a and affecting its use; at the same time, a buffer air bag 202b is installed at the upper end of the piston cylinder 202a. The setting of the buffer air bag 202b can balance the pressure inside the piston cylinder 202a when the device is in operation, so as to avoid damage to the piston cylinder 202a due to excessive pressure difference.

[0040] During use: When using the device, first, wastewater is transported to the interior of the mixing tank assembly 101 through the liquid inlet pipe provided on the mounting cover 102, and then the high-pressure pump 203 is used to drive the water inside the water tank 204 into the interior of the piston cylinder 202a, and the connecting assembly 402 is moved upward. When the connecting assembly 402 moves to the top, the high-pressure pump 203 is used in reverse to pump the water in the piston cylinder 202a back into the interior of the driving water tank 204, and the connecting assembly 402 is moved downward. At this time, negative pressure is formed inside the piston cylinder 202a, and the flocculant inside the flocculant tank 201a is sucked into the interior of the piston cylinder 202a, and flows into the interior of the mixing tank assembly 101 through the connecting assembly 402 and mixes with the wastewater, completing the addition of flocculant to the wastewater.

[0041] Example 2

[0042] Reference Figures 2 and 3 and Figure 5, which is the second embodiment of the present invention. Based on the embodiment 1, this embodiment is further improved in that: the liquid outlet unit 300 includes a liquid outlet 301 and a laser beam sensor 302 connected to the inside of the liquid outlet 301, and one end of the liquid outlet 301 is connected to a waste valve 303; the laser beam sensor 302 is symmetrically arranged inside the liquid outlet 301, and the opening and closing of the waste valve 303 are controlled by the setting of the laser beam sensor 302. When the wastewater is treated, the waste valve 303 is opened to discharge the treated wastewater. At the same time, after the wastewater is discharged, due to the discharge of the wastewater, the intensity of the beam laser between the laser beam sensors 302 reaches a threshold value, and the waste valve 303 can be automatically closed.

[0043] The mixing tank assembly 101 includes a tank body 101a and a guide rail 101b connected to the inside of the tank body 101a, and the guide rail 101b is centrally symmetrically arranged inside the tank body 101a; wherein, the guide rail 101b is fixedly installed inside the tank body 101a in a curved shape, and the guide rail 101b is centrally symmetrically arranged inside the tank body 101a, and the guide rail 101b is cooperated with the guide port 401a-2 on the stirring plate 401a, so that the connecting rod 402a can rotate along the curvature of the guide rail 101b when it moves up and down, thereby completing the mixing and stirring of the wastewater and flocculant.

[0044] The mounting assembly 103 includes a first fixing block 103a and a second fixing block 103b provided at the lower side of the first fixing block 103a, and a mounting bolt 103c is connected inside the first fixing block 103a; wherein, the first fixing block 103a is fixedly connected to the mounting cover 102, and the second fixing block 103b is fixedly connected to the tank body 101a, and a mounting bolt 103c is provided inside the first fixing block 103a, and one end of the mounting bolt 103c is provided with a rear thread and is threadedly connected to the second fixing block 103b, so as to complete the installation and fixation between the mixing tank assembly 101 and the mounting cover 102, and at the same time, a limiting mounting ring is further provided on the outside of the mounting bolt 103c, so that the mounting bolt 103c will not fall off when installed inside the first fixing block 103a;

[0045] A limiting clip strip is provided on the outside of the upper end of the tank body 101a, and a clip groove is provided on the inside of the mounting cover 102 where it is connected to the tank body 101a. The two can cooperate with each other during installation, and the relative position of the mixing tank assembly 101 and the mounting cover 102 during installation can be fixed, so as to facilitate the alignment between the first fixing block 103a and the second fixing block 103b, and facilitate installation and connection.

[0046] During use: During use, through the cooperation between the guide rail 101b and the connecting component 402, the connecting component 402 can be rotated back and forth when moving up and down, ensuring that the wastewater and flocculant can be stirred when they are mixed, ensuring more sufficient mixing. At the same time, after the mixing is completed, the connecting component 402 is stopped at the upper end of the mixing tank component 101 to ensure that the connecting component 402 will not be inside the wastewater, so that the condensate generated in the wastewater after standing will not adhere to the connecting component 402, and then the waste valve 303 is opened to discharge the wastewater. After the wastewater is discharged, the laser beam sensor 302 is used to control the waste valve 303 to close.

[0047] The remaining structures are the same as those of Example 1.

[0048] Example 3

[0049] Reference Figure 2 and Figures 4 to 9 , which is the third embodiment of the present invention, is further improved on the basis of the second embodiment in that: the stirring unit 400 includes a stirring assembly 401 and a connecting assembly 402 connected to the stirring assembly 401; the stirring assembly 401 includes a stirring plate 401a and an adjusting member 401b connected to the lower side of the stirring plate 401a, and a locking member 401c is provided inside the stirring plate 401a;

[0050] Among them, the stirring component 401 and the connecting component 402 can be disassembled, which makes it convenient to take out the connecting component 402 for cleaning. At the same time, the locking part 401c set inside the stirring plate 401a can be locked with the connecting component 402 to complete the installation and fixation of the connecting component 402, and the adjusting part 401b is installed on the lower side of the stirring plate 401a. The rotation of the adjusting part 401b can drive the locking part 401c to move, thereby completing the installation, fixation and disassembly of the connecting component 402.

[0051] The connecting rod 402a includes a connecting rod body 402a-1 and a snap-fit ​​hole 402a-2 defined in the connecting rod body 402a-1. A connecting flow channel 402a-3 is defined within the connecting rod body 402a-1, and a liquid outlet 402a-4 is provided on the exterior of the connecting flow channel 402a-3. A lower one-way valve 402b is mounted at one end of the connecting rod 402a to prevent wastewater within the tank body 101a from flowing back into the piston cylinder 202a. The lower one-way valve 402b is sealingly mounted within the piston cylinder 202a and slides therein, enabling the high-pressure pump 203 and the drive water tank 204 to cooperate and drive the connecting assembly 402 to move up and down.

[0052] The connecting rod 402a and the stirring plate 401a are connected through the connecting flow channel 402a-3 and the liquid outlet 402a-4 to ensure the connection between the piston cylinder 202a and the tank body 101a, so that the flocculant can enter the interior of the tank body 101a and mix with the wastewater.

[0053] The stirring plate member 401a includes a stirring plate body 401a-1 and a guide port 401a-2 opened on the outside of the stirring plate body 401a-1, an inner flow channel 401a-3 is opened inside the stirring plate body 401a-1, and through ports 401a-4 are opened on both sides of the inner flow channel 401a-3, and a connecting hole 401a-5 is set inside the stirring plate body 401a-1; the connecting rod member 402a is installed inside the connecting hole 401a-5, and the liquid outlet hole 402a-4 is located inside the connecting hole 401a-5, so that it can be connected with the through port 401a-4. When the flocculant enters the through port 401a-4 through the liquid outlet hole 402a-4, the interface diagram flows out through the inner flow channel 401a-3 and mixes with the wastewater.

[0054] The adjusting member 401b includes a rotating plate 401b-1 and a rotating connecting ring 401b-2 connected to the rotating plate 401b-1. The outer portion of the rotating connecting ring 401b-2 is connected to an arc block 401b-3. The engaging member 401c includes a locking rod 401c-1 and a connecting vertical rod 401c-2 connected to one side of the locking rod 401c-1. One side of the connecting vertical rod 401c-2 is connected to a matching block 401c-3. One end of the locking rod 401c-1 is connected to a return spring 401c-4. One end of the locking rod 401c-1 is provided with an inclined sliding surface, and the matching block 401c-3 and the arc block 401b-3 are arranged to cooperate with each other.

[0055] By connecting an arc block 401b-3 to the outer periphery of the rotating connecting ring 401b-2, the outer side surface of the arc block 401b-3 is designed to cooperate with the side surface of the matching block 401c-3, and at the same time limit the rotation degree of the arc block 401b-3. When the adjusting member 401b rotates, it can drive the connecting vertical rod 401c-2 to move through cooperation, and then drive the locking rod 401c-1 to move. Since the locking rod 401c-1 is locked and connected with the locking hole 402a-2, an inclined surface is provided on the side of the locking rod 401c-1 close to the locking hole 402a-2, and cooperates with the inclined surface at the lower end of the locking hole 402a-2, so as to complete the locking and fixation of the connecting rod 402a, and at the same time, the connecting rod 402a can be disassembled by utilizing the rotation of the adjusting member 401b.

[0056] During use: When the stirring assembly 401 needs to be taken out for cleaning, the mixing tank assembly 101 and the mounting cover 102 are disassembled, and then the adjusting piece 401b is rotated to make the arc block 401b-3 drive the connecting vertical rod 401c-2 to move, thereby disengaging the engaging rod 401c-1 from the engaging hole 402a-2, and separating the stirring assembly 401 from the connecting assembly 402. The disassembly between the stirring assembly 401 and the connecting assembly 402 is completed, and the stirring assembly 401 is taken out for easy cleaning.

[0057] The remaining structures are the same as those of Example 2.

[0058] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0059] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0060] It will be appreciated that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will, for those of ordinary skill having the benefit of this disclosure, be a routine undertaking of design, fabrication, and production without undue experimentation.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A wastewater treatment device for a thermal power plant, characterized by: include, A mixing unit (100), the mixing unit (100) comprising a mixing tank assembly (101) and a mounting cover (102) mounted on the mixing tank assembly (101), wherein a mounting assembly (103) is connected to the mixing tank assembly (101) and the mounting cover (102); A feeding unit (200), the feeding unit (200) comprising a liquid storage component (201) and a piston component (202) connected to the liquid storage component (201), one side of the piston component (202) being connected to a high-pressure pump (203), and the other side of the high-pressure pump (203) being connected to a driving water tank (204); A liquid outlet unit (300), the liquid outlet unit (300) comprising a liquid outlet (301) and a laser beam sensor (302) connected to the inside of the liquid outlet (301), one end of the liquid outlet (301) being connected to a waste valve (303); A stirring unit (400), the stirring unit (400) comprising a stirring component (401) and a communication component (402) connected to the stirring component (401); The mixing tank assembly (101) comprises a tank body (101a) and a guide rail (101b) connected to the inside of the tank body (101a), wherein the guide rail (101b) is centrally symmetrically arranged inside the tank body (101a); The mounting assembly (103) comprises a first fixing block (103a) and a second fixing block (103b) arranged on the lower side of the first fixing block (103a), wherein the interior of the first fixing block (103a) is connected with a mounting bolt (103c); The stirring assembly (401) comprises a stirring plate (401a) and an adjusting member (401b) connected to the lower side of the stirring plate (401a); a locking member (401c) is provided inside the stirring plate (401a); The stirring plate member (401a) comprises a stirring plate body (401a-1) and a guide port (401a-2) provided outside the stirring plate body (401a-1); an inner flow channel (401a-3) is provided inside the stirring plate body (401a-1); and through ports (401a-4) are provided on both sides of the inner flow channel (401a-3); and a connecting hole (401a-5) is provided inside the stirring plate body (401a-1); The regulating member (401b) comprises a rotating plate (401b-1) and a rotating connecting ring (401b-2) connected to the rotating plate (401b-1), wherein the outside of the rotating connecting ring (401b-2) is connected to an arc-shaped block (401b-3); The engaging member (401c) comprises a engaging rod (401c-1) and a connecting vertical rod (401c-2) connected to one side of the engaging rod (401c-1), one side of the connecting vertical rod (401c-2) is connected to a matching block (401c-3), and one end of the engaging rod (401c-1) is connected to a return spring (401c-4); An inclined sliding surface is provided on one end of the locking rod (401c-1), and the matching block (401c-3) and the arc-shaped block (401b-3) are arranged in mutual matching contact.

2. The thermal power plant wastewater treatment device according to claim 1, characterized in that: The liquid storage assembly (201) comprises a flocculant tank (201a) and a feeding pipe (201b) connected to the inside of the flocculant tank (201a), and an upper one-way valve (201c) is installed on the feeding pipe (201b).

3. The thermal power plant wastewater treatment device according to claim 2, characterized in that: The piston assembly (202) comprises a piston cylinder (202a) and a buffer air bag (202b) connected to the piston cylinder (202a).

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